CN102035782B - Mapping method and device for demodulation reference symbol in expansion of cyclic prefix - Google Patents

Abstract

The invention discloses a mapping method and device for a demodulation reference symbol in expansion of a cyclic prefix, used for implanting that, in an LTE-A system, UE identifies channel response characteristics on a plurality of transmission layers so as to estimate channel response of each layer. In the mapping method and device, under a condition of expansion of the cyclic prefix, a demodulation data reference pilot frequency is arranged as much as possible on an OFDM symbol which is not conflicted with other signals, thereby avoiding the conflict between the demodulation reference symbol and a control channel and the conflict between a public pilot frequency and a channel state reference symbol, simultaneously, the overhead of the demodulation reference symbol is reduced greatly, so that channel estimation performance and cost can be balanced well.

Description

The mapping method of demodulation reference symbol in expansion of cyclic prefix and device

Technical field

The present invention relates in wireless communication system, particularly in LTE-A system, under extended cyclic prefix pattern, the method for designing of demodulation reference mark 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 transmission rate.In order to realize channel quality measurement and the data demodulates of introducing after high-order multi-antenna technology, LTE-Advanced system has defined respectively two class reference symbols: demodulation reference mark (DMRS, Demodulation Reference Signal) and channel status reference symbol (CSI-RS, Channel State Information-Reference Signal), wherein, demodulation reference mark is for Physical Downlink Shared Channel (PDSCH, Physical Downlink SharedChannel).Channel status reference symbol is for channel quality indication (CQI, Channel QualityIndicator), pre-coding matrix indication (PMI, Precoding Matrix Indicator), stratum indicates reporting of information such as (RI, Rank Indicator).The structure of two class reference symbols can be for supporting as multipoint cooperative (CoMP, Coordinated Multi-Point), the new technical feature of the LTE-A such as spatial reuse.

In LTE, that adopt is common reference symbol (Common Reference Signal, CRS) carry out pilot measurement, namely all users use common reference symbol to carry out channel estimating, this common reference symbol needs emitting side additionally to notify which kind of pretreatment mode of data acquisition of receiving terminal transmitting, and expense is larger, in addition at multiuser mimo system (Multiuser Multiple-InputMultiple-Output, MU-MIMO) in, because a plurality of UE are being used identical CRS, cannot realize the quadrature of pilot tone, therefore be unable to estimate interference.

In LTE-A, in order to reduce the expense of pilot tone, channel status reference symbol and demodulation reference mark are separately designed, demodulation reference mark and identical pretreatment mode for data acquisition, according to the available order information of dispatched users respective channels, shine upon described demodulation reference mark (order refers to order corresponding to channel matrix forming between receiving-transmitting sides antenna simultaneously, available order number refers to that characteristic value in corresponding current channel matrix meets the characteristic value number of certain constraints, when meeting the characteristic value number of constraints when lower, be called low rank channel; When the number satisfying condition is higher, be called high order channel), therefore can adaptively according to order information, adjust expense, like this in the lower situation of order, can greatly reduce expense.LTE-A comprises the formed consistent viewpoint of demodulation reference mark design at present:

Terminal distinctive (UE-specific), as: the identical precoding processing for data acquisition of the demodulation reference mark that particular terminal is corresponding and dispatched users.

-only exist only in the resource and layer that network side (as eNodeB) dispatched for transfer of data.

-at network side, the reference symbol of transmitting on different layers is mutually orthogonal.

The design criterion of demodulation reference mark is that the specific reference symbol of the terminal for beamforming transmission to defining in LTE R8 protocol version is expanded to multilayer.

In 58 meetings of 3GPP, passed through in normal cyclic prefix situation the baseline (baseline) of the demodulation reference mark design of the layer beam figuration of R9 (dual-layer beamforming).But still the demodulation reference mark method for designing of LTE R9 and LTE-A (R10) under extended cyclic prefix pattern is not discussed.

This patent is mainly under the extended cyclic prefix pattern of considering, the design problem of demodulation reference mark.In LTE-A, under the pattern of extended cyclic prefix, a Resource Block (Resource Block, RB) structure chart as shown in Figure 7, in Fig. 7, a RB accounts for 12 subcarriers on frequency domain, in time domain, account for 12 OFDMs (Orthogonal Frequency Division Multiplexing, OFDM) symbol, wherein front 4 OFDM symbols for the carrying of control channel (wherein, while only having system bandwidth to be less than or equal to 10 times of RB frequency domain bandwidth, just use 4 OFDM symbols for Bearer Control channel), therefore on front 4 OFDM, should try one's best and not carry any proprietary demodulation reference mark.In Fig. 7, dash area is the public reference signal defining in LTE.Because allowing the common reference symbol of different districts, LTE in the different sub carrier of same OFDM symbol, carries out translation (a kind of frequency-hopping mode), in order to keep the backward compatibility with LTE, in the RB of LTE-A, still retain these common reference symbol and frequency hopping form thereof, so these Resource Units (Resource Element, RE) on the OFDM symbol at place, can not carry any proprietary demodulation data reference signal, should avoid and the conflicting of these symbols as far as possible.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of mapping method and device of demodulation reference symbol in expansion of cyclic prefix, for realizing in LTE-A system, UE is identified in a plurality of transport layer upper signal channel response characteristics, thereby estimates the channel response on each layer.

For achieving the above object, technical scheme of the present invention is achieved in that

A mapping method for demodulation reference symbol in expansion of cyclic prefix in advanced long-term evolution system, comprising:

The time-domain position of demodulation reference mark of carrying advanced long-term evolution system is positioned at not by shared OFDM (OFDM) symbol of control channel, common reference symbol and witness mark symbol, and therefrom selects one or more OFDM symbols for carrying described demodulation reference mark;

Demodulation reference mark between a plurality of layers is divided by frequency division, time-division, code or the mode of multiple multiplex mode mixing is carried out orthogonal multiplex.

The compound mode of OFDM symbol of further, carrying described demodulation reference mark is for adopting any one in following three kinds of modes:

A1, described demodulation reference mark maximum take 4 OFDM symbols, and are mapped on the 5th, the 6th, the 11st and the 12nd OFDM symbol or on the 5th, the 6th, the 9th and the 11st OFDM symbol;

A2, described demodulation reference mark maximum take 2 OFDM symbols, and are mapped on the 5th and the 12nd OFDM symbol or on the 5th and the 11st OFDM symbol;

A3, described demodulation reference mark maximum take 3 OFDM symbols, and be mapped on the 5th, the 9th and the 12nd OFDM symbol, or 5th, on the 8th and the 12nd OFDM symbol, or on the 5th, the 9th and the 11st OFDM symbol or on the 5th, the 8th and the 11st OFDM symbol.

Further, the multiplex mode adopting between described a plurality of layer is any one in following mode:

Between B1, each layer, adopt the mode of code division multiplexing;

Between B2, each layer, adopt frequency division and/or time-multiplexed mode, the number of layers of simultaneously using according to network side is classified, in different class situations, in each Resource Block every layer according to different densities Resources allocation unit (RE);

B3, in number of layers, be less than or equal at 2 o'clock, between each layer, adopt the mode of code division multiplexing; In number of layers, be greater than at 2 o'clock, the hybrid multiplex mode that adopts code division multiplexing to combine with frequency division and/or time division multiplexing between each layer;

B4, in number of layers, be less than or equal to 2 or be less than or equal at 4 o'clock, between each layer, adopt frequency division and/or time-multiplexed mode; In number of layers, be greater than 2 or be greater than at 4 o'clock, between each layer, adopt the hybrid multiplex mode that frequency division and/or time-division combine with code minute.

Further, according to the number of layers of the actual use of system, layer is classified, for the map type in given number of layers interval, described a plurality of layers are divided into groups, between the respective layer of described grouping, adopt different multiplex modes, concrete packet mode is any one in following mode:

In C1, same group, adopt the mode of code division multiplexing, between group, adopt the mode of time-division and/or frequency division multiplexing;

In C1, same group, adopt the mode of time-division and/or frequency division multiplexing, between group, adopt the mode of code division multiplexing.

Further, every layer in inhomogeneity adopts identical or different average pilot density; Between of a sort different layers, it is identical that the density of the demodulation data reference signal of every layer keeps.

Based on preceding method, further, the number of layers of using according to reality is divided into the mapping of low-rank class and the mapping of high order class by the type of mapping, and for described low-rank class mapping, the demodulation reference mark overhead on all layers is 8RE/RB or 12RE/RB; For described high order class mapping, the overhead of the demodulation reference mark on all layers is 24RE/RB, or 16RE/RB, or 18RE/RB.

Further, the selection mode of the time-domain position of described demodulation reference mark is any one in following mode:

D1, when adopting code division multiplexing or code division multiplexing and frequency division and/or time division mixed multiplexing mode between different layers, the time-domain position of described demodulation reference mark is positioned on the 5th, the 6th OFDM symbol and the 11st, the 12nd OFDM symbol or the 5th, the 6th OFDM symbol and the 9th, the 11st Resource Unit that OFDM symbol is corresponding of a Resource Block;

D2, when adopting frequency division and/or time division multiplexing mode between different layers, the time-domain position of demodulation reference mark is positioned at the 5th, the 9th and the 12nd OFDM symbol of a Resource Block, or the 5th, the 9th and the 11st OFDM symbol.

Further, on each OFDM symbol, two Adjacent resource unit of every layer of demodulation reference mark be spaced apart 3 or 4 Resource Units; Or on each OFDM symbol, adjacent two demodulation reference mark of same layer be spaced apart 2 or 3 Resource Units.

Based on the method for the invention, the present invention also proposes the mapping device of demodulation reference symbol in expansion of cyclic prefix in a kind of advanced long-term evolution system,

Described mapping device is for adopting the Resource Block of extended cyclic prefix to shine upon demodulation reference mark;

Described mapping device is in time domain direction, never in the OFDM symbol being taken by control channel, common reference symbol and witness mark symbol, select one or more OFDM symbols for carrying described demodulation reference mark, and the mode of mixing by frequency division, time-division, code minute or multiple multiplex mode between a plurality of layer is carried out orthogonal multiplex.

Further, when described mapping device is selected the OFDM symbol of the described demodulation reference mark of carrying, any one below adopting in three kinds of modes:

E1, described demodulation reference mark maximum take 4 OFDM symbols, and are mapped on the 5th, the 6th, the 11st and the 12nd OFDM symbol or on the 5th, the 6th, the 9th and the 11st OFDM symbol;

E2, described demodulation reference mark maximum take 2 OFDM symbols, and are mapped on the 5th and the 12nd OFDM symbol or on the 5th and the 11st OFDM symbol;

E3, described demodulation reference mark maximum take 3 OFDM symbols, and be mapped on the 5th, the 9th and the 12nd OFDM symbol, or 5th, on the 8th and the 12nd OFDM symbol, or on the 5th, the 9th and the 11st OFDM symbol or on the 5th, the 8th and the 11st OFDM symbol.

Further, the multiplex mode that described mapping device adopts when the described demodulation reference mark of mapping between a plurality of layers is any one in following mode:

Between F1, each layer, adopt the mode of code division multiplexing;

Between F2, each layer, adopt frequency division and/or time-multiplexed mode, the number of layers of simultaneously using according to network side is classified, in different class situations, in each Resource Block every layer according to different densities Resources allocation unit;

F3, in number of layers, be less than or equal at 2 o'clock, between each layer, adopt the mode of code division multiplexing; In number of layers, be greater than at 2 o'clock, the hybrid multiplex mode that adopts code division multiplexing to combine with frequency division and/or time division multiplexing between each layer;

F4, in number of layers, be less than or equal to 2 or be less than or equal at 4 o'clock, between each layer, adopt frequency division and/or time-multiplexed mode; In number of layers, be greater than 2 or be greater than at 4 o'clock, between each layer, adopt the hybrid multiplex mode that frequency division and/or time-division combine with code minute.

Further, described mapping device is classified according to the number of layers of the actual use of system, for the class in given number of layers interval, described a plurality of layers is divided into groups, between the respective layer of described grouping, adopt different multiplex modes, concrete packet mode is any one in following mode:

In G1, same group, adopt the mode of code division multiplexing, between group, adopt the mode of time-division and/or frequency division multiplexing;

In G2, same group, adopt the mode of time-division and/or frequency division multiplexing, between group, adopt the mode of code division multiplexing.

Further, every layer in inhomogeneity adopts identical or different average pilot density; Between of a sort different layers, it is identical that the density of the demodulation data reference signal of every layer keeps.

Further, the number of layers that described mapping device uses according to reality is divided into the mapping of low-rank class and the mapping of high order class by the type of mapping, and for described low-rank class mapping, the demodulation reference mark overhead on all layers is 8RE/RB or 12RE/RB; For described high order class mapping, the overhead of the demodulation reference mark on all layers is 24RE/RB, or 16RE/RB, or 18RE/RB.

Further, described mapping device when selecting the time-domain position of described demodulation reference mark, any one in the following ways:

H1, when adopting code division multiplexing or code division multiplexing and frequency division and/or time division mixed multiplexing mode between different layers, the time-domain position of described demodulation reference mark is positioned on the 5th, the 6th OFDM symbol of a Resource Block and the 11st, the 12nd OFDM symbol or the 5th, the 6th OFDM symbol and the 9th, the 11st Resource Unit that OFDM symbol is corresponding (RE);

H2, when adopting frequency division and/or time division multiplexing mode between different layers, the time-domain position of demodulation reference mark is positioned at the 5th, the 9th and the 12nd OFDM symbol of a Resource Block, or the 5th, the 9th and the 11st OFDM symbol.

Further, described mapping device when hinting obliquely at described demodulation reference mark, on each OFDM symbol, two Adjacent resource unit of every layer of demodulation reference mark be spaced apart 3 or 4 Resource Units; Or adjacent two demodulation reference mark of same layer be spaced apart 2 or 3 Resource Units.

In the present invention, taken into full account in extended cyclic prefix situation, demodulation data reference pilot tone is arranged in not on the OFDM symbol with other signal conflicts as far as possible, thereby avoided the collision problem of demodulation reference mark and control channel and public guide frequency thereof and channel status reference symbol, the overhead issues of simultaneously abundant demodulation reference mark.Thereby make can access between channel estimating performance and expense compromise preferably.

Accompanying drawing explanation

Fig. 1-1A to 1-1C is the mapping mode schematic diagram that the present invention is based on demodulation reference mark under the multiplexing extended cyclic prefix pattern of CDM;

Fig. 2-1A to 2-1C is the mapping mode schematic diagram that the present invention is based on demodulation reference mark under the multiplexing extended cyclic prefix pattern of CDM;

Fig. 3-1A to 3-1C is for the present invention is based under FDM and/or TDM multiplex mode, demodulation reference mark mapping method schematic diagram while taking 4 OFDM symbols;

Fig. 3-2A to 3-2C is for the present invention is based under FDM and/or TDM multiplex mode, demodulation reference mark mapping method schematic diagram while taking 2 OFDM symbols;

Fig. 4-1A to 4-1C is for the present invention is based under FDM and/or TDM multiplex mode, and resource overhead is 16RE and maximum demodulation reference mark mapping method schematic diagram while taking 4 OFDM symbols to the maximum;

Fig. 4-2A to 4-2C is for the present invention is based under FDM and/or TDM multiplex mode, and resource overhead is 16RE and maximum demodulation reference mark mapping method schematic diagram while taking 2 OFDM symbols to the maximum;

Fig. 5-1A to 5-1C is that base of the present invention is based on FDM and/or TDM and CDM hybrid multiplex demodulation reference mark mapping mode schematic diagram;

Fig. 6-1A to 6-1C is the mapping mode schematic diagram of base of the present invention based on CDM and FDM and/or TDM hybrid multiplex;

Fig. 6-2A to 6-2C is the mapping mode schematic diagram 2 of base of the present invention based on CDM and FDM and/or TDM hybrid multiplex;

Fig. 7 is the interior framework of the RB of an extended cyclic prefix of LTE system, and the physical resource position view at public reference signal and control signal place thereof.

Embodiment

What the present invention mainly paid close attention to is the problem of the mapping mode of demodulation reference mark in LTE-A system, in view of in LTE-A system, the mapping of descending demodulation reference mark is completed by network side entity conventionally, therefore in the present invention by for completing demodulation reference mark at the abstract mapping device that is expressed as of entity of the mapping function of Resource Block, especially, this mapping device has especially been used for shining upon the function of demodulation reference mark in the present invention in the Resource Block that adopts extended cyclic prefix, described mapping device is in time domain direction, never by control channel, in the OFDM symbol that common reference symbol and witness mark symbol take, select one or more OFDM symbols for carrying described demodulation reference mark, and pass through frequency division between a plurality of layers, time-division, the mode that code divides or multiple multiplex mode mixes is carried out orthogonal multiplex.

For making the object, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.

During embodiment below describes, the maximum number of layers of all take is described as 8, in description process, according to the interval under number of layers, number of layers is classified: number of layers is less than or equal to 2, number of layers is greater than 2 and is less than or equal to 4, and number of layers is greater than 4. in certain embodiments, also front two classes can be merged into a class.

Specific embodiment 1:

Fig. 1-1 adopts in extended cyclic prefix situation for the present invention, the demodulation reference mark mapping mode schematic diagram based on code division multiplexing (Code DivisionMultiplexing, CDM).

Fig. 1-1 has provided in number of layers and has been less than or equal at 2 o'clock, and overhead is 12RE/RB; Number of layers is greater than 2 o'clock overheads has 24 Resource Units (RE) in each Resource Block (RB), i.e. the concrete mapping mode of 24RE/RB.Based on this mode, can, according to the interval under number of layers, be divided into 3 classes: number of layers belongs to that { 1,2}, number of layers belongs to that { 3,4} and number of layers belong to { 5,6,7,8}.The number of layers that Fig. 1-1A, Fig. 1-1B, Fig. 1-1C have illustrated respectively network side to use is less than or equal to 2, be greater than 2 and be less than or equal to 4 and the mapping mode that is greater than 4 o'clock corresponding demodulation reference mark, and under which, CDM is multiplexing preferentially to carry out in time domain.

Concrete mapping mode is: under extended cyclic prefix pattern, front 4 OFDM symbols are for the transmission (wherein the 4th OFDM symbol only transmits for PDCCH when system bandwidth is less than or equal to the frequency domain bandwidth of 10 RB) of down control channel, 1st, 2,4,7,8,10 OFDM symbols are for the transmission of LTE R8 CRS (when only having 2 antenna ports, on the 1st, 4,5,10 OFDM symbols for carrying CRS).In LTE-A, the frequency pilot sign existing at full bandwidth, except the CRS in LTE R8, also comprises the CSI-RS for channel measurement.Therefore need to consider that time domain avoids and the conflicting of CSI-RS, if only retain 2 road CRS in LTE-A, CSI-RS, the in the situation that of extended cyclic prefix, can be mapped on the 2nd and the 8th OFDM symbol.

Analysis based on above-mentioned, the OFDM symbol that demodulation reference mark can be mapped to is the 5th, 6,9,11,12 OFDM symbols.Because CDM is multiplexing, preferentially in time domain, consider, therefore should guarantee the orthogonality of time-domain position as far as possible, that is to say that channel should remain unchanged on the multiplexing two or more RE of CDM as far as possible, therefore select the 5th, 6,11,12 symbols as carrying DMRS.

The data resource of simultaneously considering each user probably only distributes a Resource Block, and therefore in the present embodiment, demodulation reference mark is positioned at the frequency domain marginal position of RB as far as possible.

In the present embodiment, when the number of layers of network side use is less than or equal to 2, corresponding demodulation reference mark mapping pattern is as shown in Fig. 1-1A, shared RE position is respectively (x, y), wherein x represents the index of OFDM symbol, y represents the relative subcarrier sequence number in a RB, under the mapping mode shown in Fig. 1-1A, the demodulation reference mark of same layer is at 4 (intervals between the adjacent R E shining upon on the demodulation reference mark frequency domain that demodulation reference mark frequency domain interval is same layer) that are spaced apart of frequency domain, and the value of x and y is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3\}=\left\{\mathrm{1,6,11}\right\}\end{array}\right.$

Layer 1 and layer 2 are on two adjacent OFDM symbol simultaneously, on corresponding same frequency position, with Walsh (walsh) code, carry out code division multiplexing, layer 1, layer 2 at the walsh code that is 2 by length, on the 5th, 6 and the 11st, 12 OFDM symbols, carry respectively on the RE of same frequency position of demodulation reference mark, carry out multiplexing, as the RE position that in figure, oval frame comprised.Concrete, the RE of mapping DMRS is divided into 6 groups: { (x ₁, y ₁), (x ₂, y ₁), { (x ₃, y ₁), (x ₄, y ₁), { (x ₁, y ₂), (x ₂, y ₂), { (x ₃, y ₂), (x ₄, y ₂), { (x ₁, y ₃), (x ₂, y ₃), { (x ₃, y ₃), (x ₄, y ₃), between two RE in same group, by walsh code, the demodulation reference mark of layer 1 and layer 2 is carried out to CDM multiplexing.

Fig. 1-1B has provided based on 1-1A basis, and when the number of layers L of system use belongs to set, { mapping method of demodulation reference mark during 3,4}, now the value of x and y is respectively

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

Now adopting length is 4 walsh code, in Fig. 1-1B, has marked the RE group of carrying out code division multiplexing equally with oval frame.Concrete, be divided into equally 6 groups, between four RE in same group, by walsh code, the demodulation reference mark of layer 1, layer 2, layer 3, layer 4 is carried out to CDM multiplexing.6 groups of RE are respectively:

Group 1:{ (x ₁, y ₁), (x ₂, y ₁), (x ₁, y ₂), (x ₂, y ₂),

Group 2:{ (x ₃, y ₁), (x ₄, y ₁), (x ₃, y ₂), (x ₄, y ₂),

Group 3:{ (x ₁, y ₃), (x ₂, y ₃), (x ₁, y ₄), (x ₂, y ₄),

Group 4:{ (x ₃, y ₃), (x ₄, y ₃), (x ₃, y ₄), (x ₄, y ₄),

Group 5:{ (x ₁, y ₅), (x ₂, y ₅), (x ₁, y ₆), (x ₂, y ₆),

Group 6:{ (x ₃, y ₅), (x ₄, y ₅), (x ₃, y ₆), (x ₄, y ₆)

Consider when number of layers is greater than at 2 o'clock only for low speed scene, carry out the multiplexing RE group technology of CDM and also can divide into groups according to mode below:

Group 1:{ (x ₁, y ₁), (x ₂, y ₁), (x ₃, y ₁), (x ₄, y ₁),

Group 2:{ (x ₁, y ₂), (x ₂, y ₂), (x ₃, y ₂), (x ₄, y ₂),

Group 3:{ (x ₁, y ₃), (x ₂, y ₃), (x ₃, y ₃), (x ₄, y ₃),

Group 4:{ (x ₁, y ₄), (x ₂, y ₄), (x ₃, y ₄), (x ₄, y ₄),

Group 5:{ (x ₁, y ₅), (x ₂, y ₅), (x ₃, y ₅), (x ₄, y ₅),

Group 6:{ (x ₁, y ₆), (x ₂, y ₆), (x ₃, y ₆), (x ₄, y ₆)

Fig. 1-1C based on Fig. 1-1A and Fig. 1-1B further provided the number of layers of using when system belong to the mapping method of demodulation reference mark during 5,6,7,8}, now the value of x and y and number of layers are that the RE position of 4 o'clock is identical, are respectively:

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

Now adopting length is 8 walsh code, carries out one group of multiplexing RE of CDM as in the oval frame in Fig. 1-1C position corresponding to corresponding shade RE.Now all RE are divided into 3 groups, between 8 RE in same group, by walsh code, the demodulation reference mark of layer 1, layer 2, layer 3, layer 4 are carried out to CDM multiplexing.Three groups of RE are as follows:

Group 1:{ (x ₁, y ₁), (x ₂, y ₁), (x ₃, y ₁), (x ₄, y ₁), (x ₁, y ₂), (x ₂, y ₂), (x ₃, y ₂), (x ₄, y ₂);

Group 2:{ (x ₁, y ₃), (x ₂, y ₃), (x ₃, y ₃), (x ₄, y ₃), (x ₁, y ₄), (x ₂, y ₄), (x ₃, y ₄), (x ₄, y ₄);

Group 3:{ (x ₁, y ₅), (x ₂, y ₅), (x ₃, y ₅), (x ₄, y ₅), (x ₁, y ₆), (x ₂, y ₆), (x ₃, y ₆), (x ₄, y ₆)

When adopting CDM mode between different layers, carry out when multiplexing, when the pattern when making number of layers less and number of layers are more, pattern is as far as possible compatible, the orthogonal code when orthogonal code that during low number of layers, layer is used should be with high-rise number on one group of corresponding RE is consistent as far as possible, concrete, a kind of orthogonal code method of salary distribution is as follows, can find out, in the method for salary distribution below, the layer of low sequence number, in the situation that the number of layers that network side is used is different, the repetition of corresponding sequence when using number of layers less.

Number of layers belong to during 1,2}, the walsh codes that layer 1 and layer 2 are used are:

$\left\{\begin{array}{cc}{l}_1:1& 1\\ l_2:1& -1\end{array}\right.$

Number of layers belong to during 3,4}, the walsh code of each layer of use is:

$\left\{\begin{array}{cccc}{l}_1:1& 1& 1& 1\\ l_2:1& -1& 1& -1\\ l_3:1& 1& -1& -1\\ l_4:1& -1& -1& 1\end{array}\right.$

Number of layers belong to during 5,6,7,8}, the walsh code of each layer of use is:

$\left\{\begin{array}{cccccccc}{l}_1:1& 1& 1& 1& 1& 1& 1& 1\\ l_2:1& -1& 1& -1& 1& -1& 1& -1\\ l_3:1& 1& -1& -1& 1& 1& -1& -1\\ l_4:1& -1& -1& 1& 1& -1& -1& 1\\ l_5:1& 1& 1& 1& -1& -1& -1& -1\\ l_6:1& 1& -1& -1& -1& -1& 1& 1\\ l_7:1& -1& -1& 1& -1& 1& 1& -1\\ l_8:1& -1& 1& -1& -1& 1& -1& 1\end{array}\right.$

At Fig. 1-1A, 1-1B, the demodulation reference mark mapping position shown in 1-1C, does not consider to carry out between different RB the scene of joint channel estimation, the performance while being unfavorable for improving adjacent R B joint channel estimation.In actual applications, if consider can carry out between adjacent RB the situation of joint channel estimation, can be to Fig. 1-1A, 1-1B, the frequency domain position shown in the figure in 1-1C is revised, x in Fig. 1-1A, the value of y can be modified to:

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3\}=\left\{\mathrm{2,6,10}\right\}\end{array}\right.$

X in Fig. 1-1B and 1-1C, y value can be modified to:

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{2,3},\mathrm{6,7,10,11}\}\end{array}\right.$

In some scene, for example, when introducing relay station (relay), due to the transmitting-receiving conversion of relay, need to be used for Transmit enable for the reserved OFDM symbol of relay, now last OFDM symbol is likely unfavorable for placing demodulation reference mark.The value of above-mentioned x can be revised as x ∈ { 5,6,9,11}.

Specific embodiment 2:

In expansion CP situation, because circulating prefix-length is larger, so actual can will minimizing for the RE quantity of transmission PDSCH data, in this case, for the expense that guarantees pilot tone is in a rational scope, can consider to reduce with respect to normal cyclic prefix situation the expense of DMRS.A kind of consideration is to be less than or equal at 2 o'clock in number of layers, and it is identical with embodiment 1 that the expense of DMRS keeps, and number of layers is greater than at 2 o'clock, only uses 16 RE.Or being less than or equal at 2 o'clock in number of layers, the overhead of DMRS is 8 RE, and number of layers is greater than at 2 o'clock, only uses 16 RE.When number of layers is less than or equal to 2, overhead keeps the DMRS mapping mode identical with embodiment 1 to describe at embodiment 1, mainly describes expense and the asynchronous situation of embodiment 1 here.Fig. 2-1 has provided the mapping mode schematic diagram of a kind of DMRS requiring based on the present embodiment expense, in figure, for transmitting the RE shade of DMRS represent.The walsh code occupation mode that the present embodiment is corresponding, and multiplex mode is identical with embodiment 1, is not repeating, and due to the minimizing of RE number, only describes mapping mode and multiplex mode here.

In the present embodiment, when the number of layers of network side use is less than or equal to 2, corresponding demodulation reference mark pattern is as shown in Fig. 2-1A.Shared RE position uses (x, y) to represent equally.Under the mapping mode shown in Fig. 2-1A, the demodulation reference mark of same layer in the value that is spaced apart 5, x and y of frequency domain is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2\}=\left\{\mathrm{3,9}\right\}\end{array}\right.$

Packet mode is now similar to Example 1, just on frequency domain position than the few one group of RE of embodiment 1, corresponding packet mode is the RE that shines upon DMRS to be divided into 4 groups: { (x ₁, y ₁), (x ₂, y ₁), { (x ₃, y ₁), (x ₄, y ₁), { (x ₁, y ₂), (x ₂, y ₂), { (x ₃, y ₂), (x ₄, y ₂) by walsh code, the demodulation reference mark of layer 1 and layer 2 to be carried out to CDM between two RE in same group multiplexing.

Same Fig. 2-1B has provided based on 2-1A basis, the number of layers of using when system belong to set the mapping method of demodulation reference mark during 3,4}, now the value of x and y is respectively:

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4\}=\left\{\mathrm{3,4,9,10}\right\}\end{array}\right.$

Corresponding Packet Multiplexing mode is, the RE of mapping DMRS is divided into 4 groups in the following manner, and to each layer being carried out to code division multiplexing by walsh code between four RE in same group.

Group 1:{ (x ₁, y ₁), (x ₂, y ₁), (x ₁, y ₂), (x ₂, y ₂),

Group 2:{ (x ₃, y ₁), (x ₄, y ₁), (x ₃, y ₂), (x ₄, y ₂),

Group 3:{ (x ₁, y ₃), (x ₂, y ₃), (x ₁, y ₄), (x ₂, y ₄),

Group 4:{ (x ₃, y ₃), (x ₄, y ₃), (x ₃, y ₄), (x ₄, y ₄),

When considering that layer while being greater than 2 during only for low speed scene, carrying out the multiplexing RE group technology of CDM and also can divide into groups according to mode below:

Group 1:{ (x ₁, y ₁), (x ₂, y ₁), (x ₃, y ₁), (x ₄, y ₁),

Group 2:{ (x ₁, y ₂), (x ₂, y ₂), (x ₃, y ₂), (x ₄, y ₂),

Group 3:{ (x ₁, y ₃), (x ₂, y ₃), (x ₃, y ₃), (x ₄, y ₃),

Group 4:{ (x ₁, y ₄), (x ₂, y ₄), (x ₃, y ₄), (x ₄, y ₄),

The number of layers of using when system belongs to set { 5,6,7, during 8}, the mapping mode based on 2-1A and 2-1B is as shown in Fig. 2-1C, and now all RE are divided into 2 groups, the walsh code that is 8 by length between eight RE in same group carries out code division multiplexing, and 2 groups of corresponding RE are respectively:

Group 1:{ (x ₁, y ₁), (x ₂, y ₁), (x ₃, y ₁), (x ₄, y ₁), (x ₁, y ₂), (x ₂, y ₂), (x ₃, y ₂), (x ₄, y ₂);

Group 2:{ (x ₁, y ₃), (x ₂, y ₃), (x ₃, y ₃), (x ₄, y ₃), (x ₁, y ₄), (x ₂, y ₄), (x ₃, y ₄), (x ₄, y ₄);

In the present embodiment, several mapped modes that Fig. 2-1 provides design based on carrying out joint channel estimation between adjacent R B, if while not needing to carry out joint channel estimation, similar to Example 1, can make frequency domain position be positioned at the edge of RB as far as possible.Now number of layers is less than or equal at 2 o'clock, and the value of y can be modified to: y ∈ { y ₁, y ₂}={ 1,11}; Number of layers is greater than at 2 o'clock, x, and the value of y can be modified to y ∈ { y ₁, y ₂}={ 1,2,11,12}.

Consider the Transmit enable of relay, the value of x can be modified to x ∈ { 5,6,9,11}.

Specific embodiment 3:

Based on described method of the present invention, in a kind of extended cyclic prefix situation, based on frequency division multiplexing, add in the mapping mode of time division multiplexing (FDM+TDM) the RE position (x that demodulation reference mark is shared, y) can be expressed as in number of layers and be less than or equal at 2 o'clock, the RE position taking is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

When number of layers is greater than 2, the position of the RE taking is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\left\{\mathrm{1,2,6,7,11,12}\right\}\end{array}\right.$

Resource unit allocation group based on above-mentioned, a kind of concrete multiplexing demodulation reference mark mapping mode based on FDM and/or TDM is as shown in Fig. 3-1.

In this specific embodiment, when number of layers is less than or equal to 2, the Resource Unit position that each layer takies is as shown in Fig. 3-1A.When number of layers be 3,4}, the Resource Unit position that each layer takies is as shown in Fig. 3-1B, when number of layers belongs to, { during 5,6,7,8}, the Resource Unit position that each layer takies is as shown in Fig. 3-1C.Concrete, when number of layers is less than or equal to 2, the RE position taking is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

The Resource Unit that each layer takies is respectively:

Layer 1:{ (x ₁, y ₁), (x ₁, y ₃), (x ₁, y ₅), (x ₂, y ₁), (x ₂, y ₃), (x ₂, y ₅)

Layer 2:{ (x ₁, y ₂), (x ₁, y ₄), (x ₁, y ₆), (x ₂, y ₂), (x ₂, y ₄), (x ₂, y ₆)

When number of layers belong to during 3,4}, the RE position taking is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\left\{\mathrm{1,2,6,7,11,12}\right\}\end{array}\right.$

Concrete, the Resource Unit that each layer takies is respectively:

Layer 1:{ (x ₁, y ₁), (x ₁, y ₃), (x ₁, y ₅), (x ₄, y ₁), (x ₄, y ₃), (x ₄, y ₅)

Layer 2:{ (x ₁, y ₂), (x ₁, y ₄), (x ₁, y ₆), (x ₄, y ₂), (x ₄, y ₄), (x ₄, y ₆)

Layer 3:{ (x ₂, y ₁), (x ₂, y ₃), (x ₂, y ₅), (x ₃, y ₁), (x ₃, y ₃), (x ₃, y ₅)

Layer 4:{ (x ₂, y ₂), (x ₂, y ₄), (x ₂, y ₆), (x ₃, y ₂), (x ₃, y ₄), (x ₃, y ₆)

When number of layers belong to during 5,6,7,8}, the RE position taking is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3,x_4\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

Concrete, the Resource Unit that each layer takies is respectively:

Layer 1:{ (x ₁, y ₁), (x ₁, y ₃), (x ₁, y ₅)

Layer 2:{ (x ₁, y ₂), (x ₁, y ₄), (x ₁, y ₆)

Layer 3:{ (x ₂, y ₁), (x ₂, y ₃), (x ₂, y ₅)

Layer 4:{ (x ₂, y ₂), (x ₂, y ₄), (x ₂, y ₆)

Layer 5:{ (x ₄, y ₁), (x ₄, y ₃), (x ₄, y ₅)

Layer 6:{ (x ₄, y ₂), (x ₄, y ₄), (x ₄, y ₆)

Layer 7:{ (x ₃, y ₁), (x ₃, y ₃), (x ₃, y ₅)

Layer 8:{ (x ₃, y ₂), (x ₃, y ₄), (x ₃, y ₆)

It should be noted that, corresponding above-mentioned mapping mode, when the number of layers of using when reality is less than the maximum number of layers of support of current layer number class, what not have to use layer can be for the transmission of PDSCH (physical Downlinkshare channe) data.For example, when the actual number of layers of using is 5, it belongs to { situation of 5,6,7,8}, the demodulation reference mark of mapping layer 1～5 correspondence only now, and be used to carry out the transmission of PDSCH data for the RE of mapping layer 6～7 corresponding demodulation reference mark; Or when the actual number of layers of using is less than the maximum number of layers of support of current layer number class, demodulation reference mark corresponding to all layers of Preserving map still, for to the estimation of disturbing.For example, for example, when the actual number of layers of using is 5, it belongs to, and { situation of 5,6,7,8}, the situation during now still according to number of layers maximum is carried out the mapping of demodulation reference mark, i.e. demodulation reference mark corresponding to all layers of mapping layer 1～8.

Similar to Example 1 equally, in order to allow to carry out joint channel estimation between Adjacent resource piece, can be modified to the position of frequency domain:

y∈{y ₁，y ₂，y ₃，y ₄，y ₅，y ₆}＝{2，3，6，7，10，11}

When last OFDM symbol is for other purposes, for example during the switching of relay, time domain value can be done as follows to revise: number of layers is less than or equal at 2 o'clock, is modified to x ∈ { x ₁, x ₂}={ 5,11}; Number of layers is greater than at 2 o'clock, x ∈ { x ₁, x ₂, x ₃, x ₄}={ 5,6,9,11}.

In the mode of describing in the above, the shared OFDM number of symbols of demodulation reference mark is 4 to the maximum.Demodulation reference mark number based on FDM and/or TDM can also be 2.Provide the mapping mode in the situation that the shared OFDM symbolic number of a kind of demodulation reference mark is 2 below, now one group of corresponding RE positional representation is, when number of layers is less than or equal to 2, for representing that the position of one group of RE is (as Fig. 3-2A):

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{5,6,9,10}\}\end{array}\right.$

When number of layers is greater than 2, corresponding RE position is (as Fig. 3-2B):

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6,y_7,y_8,y_9,y_{10},y_{11},y_{12}\}=\left\{\mathrm{1,2,3,4,5,6,7,8,9,10,11,12}\right\}\end{array}\right.$

Under this mode, when number of layers is less than or equal to 2, except y value difference, the Resource Unit packet mode of each layer is with to describe packet mode above identical.In number of layers, be greater than at 2 o'clock, modify, make demodulation reference mark only take 2 OFDM symbols, and increase the position of frequency domain, a kind of packet mode of each layer of concrete Resource Unit is, as shown in Fig. 3-2B:

When number of layers belong to set during 3,4}, each layer of corresponding resource unit group is:

Layer 1:{ (x ₁, y ₁), (x ₁, y ₅), (x ₁, y ₉), (x ₂, y ₁), (x ₂, y ₅), (x ₂, y ₉)

Layer 2:{ (x ₁, y ₂), (x ₁, y ₆), (x ₁, y ₁₀), (x ₂, y ₂), (x ₂, y ₆), (x ₂, y ₁₀)

Layer 3:{ (x ₁, y ₃), (x ₁, y ₇), (x ₁, y ₁₁), (x ₂, y ₃), (x ₂, y ₇), (x ₂, y ₁₁)

Layer 4:{ (x ₁, y ₄), (x ₁, y ₈), (x ₁, y ₁₂), (x ₂, y ₄), (x ₂, y ₈), (x ₂, y ₁₂)

When number of layers belong to set during 5,6,7,8}, each layer of corresponding resource unit group:

Layer 1:{ (x ₁, y ₁), (x ₁, y ₅), (x ₁, y ₉), (x ₂, y ₁)

Layer 2:{ (x ₁, y ₂), (x ₁, y ₆), (x ₁, y ₁₀)

Layer 3:{ (x ₁, y ₃), (x ₁, y ₇), (x ₁, y ₁₁)

Layer 4:{ (x ₁, y ₄), (x ₁, y ₈), (x ₁, y ₁₂)

Layer 5:{ (x ₂, y ₁), (x ₂, y ₅), (x ₂, y ₉)

Layer 6:{ (x ₂, y ₂), (x ₂, y ₆), (x ₂, y ₁₀)

Layer 7:{ (x ₂, y ₃), (x ₂, y ₇), (x ₂, y ₁₁)

Layer 8:{ (x ₂, y ₄), (x ₂, y ₈), (x ₂, y ₁₂)

When last OFDM symbol is for other purposes, for example during the switching of relay, time domain value can be modified to: x ∈ { x ₁, x ₂}={ 5,11}.

Specific embodiment 4:

In the present embodiment, provided in extended cyclic prefix situation, when number of layers be 1 or number of layers take 8 RE while being 2, and number of layers is greater than at 2 o'clock, takies the demodulation reference mark mapping method of 16 RE.

Expense based on above-mentioned, when number of layers is less than or equal to 2, one group of shared Resource Unit of demodulation reference mark is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{3,4},\mathrm{9,10}\}\end{array}\right.$

When number of layers belong to during 5,6,7,8}, and one group of Resource Unit Resource Unit that each layer of demodulation reference mark is shared be:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{3,\mathrm{4,9,10}\}\end{array}\right.$

Fig. 4-1 has provided the distribution method of the Resource Unit that a kind of each concrete layer take, and when number of layers is less than or equal to 2, the Resource Unit position that each layer takies is as shown in Fig. 4-1A.When number of layers belongs to set, { during 3,4}, the Resource Unit position that each layer takies is as shown in Fig. 4-1B, and when number of layers belongs to, { during 5,6,7,8}, the Resource Unit position that each layer takies is as shown in Fig. 4-1C.Concrete, when number of layers is less than or equal to 2,

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{3,\mathrm{4,9,10}\}\end{array}\right.$

In the Resource Unit representing, the Resource Unit that each layer takies is respectively:

Layer 1:{ (x ₁, y ₁), (x ₁, y ₃), (x ₂, y ₁), (x ₂, y ₃}

Layer 2:{ (x ₁, y ₂), (x ₁, y ₄), (x ₂, y ₂), (x ₂, y ₄)

When number of layers belong to during 3,4},

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{3,\mathrm{4,9,10}\}\end{array}\right.$

In the Resource Unit representing, the Resource Unit that each layer takies is respectively:

Layer 1:{ (x ₁, y ₁), (x ₁, y ₃), (x ₄, y ₁), (x ₄, y ₃)

Layer 2:{ (x ₁, y ₂), (x ₁, y ₄), (x ₄, y ₂), (x ₄, y ₄)

Layer 3:{ (x ₂, y ₁), (x ₂, y ₃), (x ₃, y ₁), (x ₃, y ₃)

Layer 4:{ (x ₂, y ₂), (x ₂, y ₄), (x ₃, y ₂), (x ₃, y ₄)

When number of layers belong to during 5,6,7,8},

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{3,4},\mathrm{9,10}\}\end{array}\right.$

In the Resource Unit representing, the Resource Unit that each layer takies is respectively:

Layer 1:{ (x ₁, y ₁), (x ₁, y ₃)

Layer 2:{ (x ₁, y ₂), (x ₁, y ₄)

Layer 3:{ (x ₂, y ₁), (x ₂, y ₃)

Layer 4:{ (x ₂, y ₂), (x ₂, y ₄)

Layer 5:{ (x ₄, y ₁), (x ₄, y ₃)

Layer 6:{ (x ₄, y ₂), (x ₄, y ₄)

Layer 7:{ (x ₃, y ₁), (x ₃, y ₃)

Layer 8:{ (x ₃, y ₂), (x ₃, y ₄)

Similar to Example 1 equally, when last OFDM symbol is for other purposes, for example during the switching of relay, time domain value can be modified to: x ∈ { x ₁, x ₂, x ₃, x ₄}={ 5,6,9,11}.

In the mode of describing in the above, the shared OFDM number of symbols of demodulation reference mark is 4 to the maximum.Demodulation reference mark number based on FDM and/or TDM can also be 2.Provide the mapping mode in the situation that the shared OFDM symbolic number of a kind of demodulation reference mark is 2 below, now one group of corresponding RE positional representation is, when number of layers is less than or equal to 2, for representing that the position of one group of RE is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4\}=\{\mathrm{3,4},\mathrm{9,10}\}\end{array}\right.$

When number of layers is greater than 2, corresponding RE position is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6,y_7,y_8\}=\{2,\mathrm{3,4},\mathrm{5,8,9,10},11\}\end{array}\right.$

Under this mode, when number of layers is less than or equal to 2, the Resource Unit packet mode of each layer is with to describe packet mode above identical as shown in Fig. 4-2A.In number of layers, be greater than at 2 o'clock, respective layer number belongs to that { 3,4} and number of layers belong to that { packet mode of 5,6,7,8} each a layer of concrete Resource Unit is as shown in Fig. 4-2B and Fig. 4-2C.

When number of layers belong to set during 3,4}, each layer of corresponding resource unit group is:

Layer 1:{ (x ₁, y ₂), (x ₁, y ₆), (x ₂, y ₂), (x ₂, y ₆)

Layer 2:{ (x ₁, y ₃), (x ₁, y ₇), (x ₂, y ₇), (x ₂, y ₇)

Layer 3:{ (x ₁, y ₁), (x ₁, y ₅), (x ₂, y ₁), (x ₂, y ₅)

Layer 4:{ (x ₁, y ₄), (x ₁, y ₈), (x ₂, y ₄), (x ₂, y ₈)

When number of layers belong to set during 5,6,7,8}, each layer of corresponding resource unit group:

Layer 1:{ (x ₁, y ₂), (x ₁, y ₆)

Layer 2:{ (x ₁, y ₃), (x ₁, y ₇)

Layer 3:{ (x ₁, y ₁), (x ₁, y ₅)

Layer 4:{ (x ₁, y ₄), (x ₁, y ₈)

Layer 5:{ (x ₂, y ₂), (x ₂, y ₆)

Layer 6:{ (x ₂, y ₇), (x ₂, y ₇)

Layer 7:{ (x ₂, y ₁), (x ₂, y ₅)

Layer 8:{ (x ₂, y ₄), (x ₂, y ₈)

When last OFDM symbol is for other purposes, for example during the switching of relay, time domain value can be modified to x ∈ { x ₁, x ₂}={ 5,11}.

Specific embodiment 5:

A kind of execution mode based on FDM and/or TDM and CDM hybrid multiplex, in the hybrid multiplex design of this embodiment, is multiplexed with main multiplex mode with FDM and/or TDM, take CDM as auxiliary multiplex mode.

When the maximum number of layers of system support is 8, each layer can be divided into two groups, every group comprises 4 layers; It is multiplexing that each in every group layer adopts the mode of FDM to carry out, and adopts the mode of CDM to carry out multiplexing between group.The mode of grouping can be following several modes:

Mode 1: $\left\{\begin{array}{c}\mathrm{Group}1=\{l_1^1,l_2^1,l_3^1,l_4^1\}=\left\{\mathrm{1,3,5,7}\right\}\\ \mathrm{Group}2=\{l_1^2,l_2^2,l_3^2,l_4^2\}=\left\{\mathrm{2,4,6,8}\right\}\end{array}\right.$

The identical layer of index between two groups carries out code division multiplexing; L wherein _i ^jrepresent i corresponding actual layer sequence number in j group, Group represents group, lower same.

Mode 2: $\left\{\begin{array}{c}\mathrm{Group}1=\{l_1^1,l_2^1,l_3^1,l_4^1\}=\left\{\mathrm{1,2,3,4}\right\}\\ \mathrm{Group}2=\{l_1^2,l_2^2,l_3^2,l_4^2\}=\left\{\mathrm{5,6,7,8}\right\}\end{array}\right.$

The identical layer of index between two groups carries out code division multiplexing;

Mode 3: $\left\{\begin{array}{c}\mathrm{Group}1=\{l_1^1,l_2^1,l_3^1,l_4^1\}=\left\{\mathrm{1,2,5,6}\right\}\\ \mathrm{Group}2=\{l_1^2,l_2^2,l_3^2,l_4^2\}=\left\{\mathrm{3,4,7,8}\right\}\end{array}\right.$

The identical layer of index between two groups carries out code division multiplexing;

Fig. 5-1 has provided a kind of concrete mapping method based on this thought.In the drawings, the mode of grouping adopts mode 2, and as shown in Fig. 5-1C, { 1,2,3,4} layer belongs to group 1, and { 5,6,7,8} layer belongs to group 2.

When number of layers equals 2, used altogether 12 RE, the time-domain position x taking and the value of frequency domain position y are respectively:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

When number of layers is greater than 2, the time-domain position x taking and the value of frequency domain position y are respectively:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

Wherein number of layers is less than or equal at 4 o'clock, between each layer, adopt the multiplex mode of time-division/frequency division to carry out multiplexing, when number of layers is greater than 4, the layer that the layer newly increasing is identical with index i in group 1 carries out code division multiplexing, in which, layer 5 is multiplexing with layer 1, and layer 6 is multiplexing with layer 2, layer 7 is multiplexing with layer 3, and layer 8 is multiplexing with layer 4.In addition, the mapping Resource Unit position of the less situation of number of layers (being less than or equal at 2 o'clock) is the subset that the more situation of number of layers (being greater than at 2 o'clock, as number of layers equals 4) takies Resource Unit.

In pattern corresponding to this embodiment, owing to not carrying out code division multiplexing between on the same group, so the Resource Unit position that the layer of code division multiplexing takies is identical, and the Resource Unit position relationship that each group takies is:

Number of layers is less than or equal to (as shown in Fig. 5-1A) at 2 o'clock:

L ₁ ¹layer: { (x ₁, y ₁), (x ₁, y ₃), (x ₁, y ₅), (x ₂, y ₁), (x ₂, y ₃), (x ₂, y ₅)

L ₂ ¹layer: { (x ₁, y ₂), (x ₁, y ₄), (x ₁, y ₆), (x ₂, y ₁), (x ₂, y ₄), (x ₂, y ₆)

When number of layers belong to set during 3,4} (as shown in Fig. 5-1B):

L ₁ ¹layer: { (x ₁, y ₁), (x ₁, y ₃), (x ₁, y ₅), (x ₄, y ₁), (x ₄, y ₃), (x ₄, y ₅)

L ₂ ¹layer: { (x ₁, y ₂), (x ₁, y ₄), (x ₁, y ₆), (x ₄, y ₁), (x ₄, y ₄), (x ₂, y ₆)

L ₃ ¹layer: { (x ₂, y ₁), (x ₂, y ₃), (x ₂, y ₅), (x ₃, y ₁), (x ₃, y ₃), (x ₃, y ₅)

L ₄ ¹layer: { (x ₂, y ₂), (x ₂, y ₄), (x ₂, y ₆), (x ₃, y ₁), (x ₃, y ₄), (x ₃, y ₆)

When number of layers belong to during 5,6,7,8}, the layer that carries out code division multiplexing takies same position i.e. (as shown in Fig. 5-1C):

L ₁ ¹layer and l ₁ ²layer: { (x ₁, y ₁), (x ₁, y ₃), (x ₁, y ₅), (x ₄, y ₁), (x ₄, y ₃), (x ₄, y ₅)

L ₂ ¹layer and l ₂ ²layer: { (x ₁, y ₂), (x ₁, y ₄), (x ₁, y ₆), (x ₄, y ₁), (x ₄, y ₄), (x ₂, y ₆)

L ₃ ¹layer and l ₃ ²layer: { (x ₂, y ₁), (x ₂, y ₃), (x ₂, y ₅), (x ₃, y ₁), (x ₃, y ₃), (x ₃, y ₅)

L ₄ ¹layer and l ₄ ²layer: { (x ₂, y ₂), (x ₂, y ₄), (x ₂, y ₆), (x ₃, y ₁), (x ₃, y ₄), (x ₃, y ₆)

Similar to Example 1 equally, when last OFDM symbol is for other purposes, for example during the switching of relay, time domain value can be modified to: number of layers is less than or equal to 2, x ∈ { x ₁, x ₂}={ 5,11}; Layer is greater than at 2 o'clock, x ∈ { x ₁, x ₂, x ₃, x ₄}={ 5,6,9,11}.If while considering can to carry out joint channel estimation between adjacent RB, can frequency domain position be modified to: y ∈ { y ₁, y ₂, y ₃, y ₄, y ₅, y ₆}={ 2,3,6,7,10,11}.

In the execution mode providing in the above, the expense design considerations that the design of the pilot tone pattern of demodulation reference mark is is: number of layers is less than or equal at 2 o'clock, and expense is 12RE/RB, and number of layers is greater than at 2 o'clock, and expense is 24RE/RB; Consider under expansion CP, can, for the RE negligible amounts of transmission data, expense can be set according to being: number of layers is less than or equal at 2 o'clock, and expense is 8RE/RB, and number of layers is greater than at 2 o'clock, and expense is 16RE/RB.Design philosophy is now similar to above-described mode, only need on above-mentioned basis, in number of layers, be less than or equal at 2 o'clock, removes two value values of the centre in frequency domain set, and corresponding sets of resource units is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4\}=\{\mathrm{1,2},\mathrm{11,12}\}\end{array}\right.$

When number of layers is greater than 2, corresponding sets of resource units is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4\}=\{\mathrm{1,2},11,12\}\end{array}\right.$

The Resource Unit position relationship that each group takies is as follows:

When number of layers is less than or equal to 2:

l ₁ ¹：{(x ₁，y ₁)，(x ₁，y ₃)，(x ₂，y ₁)，(x ₂，y ₃)}

l ₂ ¹：{(x ₁，y ₂)，(x ₁，y ₄)，(x ₂，y ₁)，(x ₂，y ₄)}

When number of layers is greater than 2, now the layer of code division multiplexing takies same position:

L ₁ ¹and l ₁ ²: { (x ₁, y ₁), (x ₁, y ₃), (x ₄, y ₁), (x ₄, y ₃)

L ₂ ¹and l ₂ ²: { (x ₁, y ₂), (x ₁, y ₄), (x ₄, y ₁), (x ₄, y ₄)

L ₃ ¹and l ₃ ²: { (x ₂, y ₁), (x ₂, y ₃), (x ₃, y ₁), (x ₃, y ₃)

L ₄ ¹and l ₄ ²: { (x ₂, y ₂), (x ₂, y ₄), (x ₃, y ₁), (x ₃, y ₄)

Corresponding to last OFDM symbol is for other purposes, for example during the switching of relay, time domain value can be modified to: number of layers is less than or equal to 2, x ∈ { x ₁, x ₂}={ 5,11}; Layer is greater than at 2 o'clock, x ∈ { x ₁, x ₂, x ₃, x ₄}={ 5,6,9,11}.If while considering can to carry out joint channel estimation between adjacent RB, can be modified to y ∈ { y to frequency domain position ₁, y ₂, y ₃, y ₄}={ 2,3,10,11}.

Specific embodiment 6:

Take code division multiplexing as main multiplex mode, and frequency division multiplexing and/or time division multiplexing are the hybrid multiplex method of auxiliary multiplex mode.In which, first the mode based on code division multiplexing is that pilot patterns sample is set in low-rank situation, and the mode based on frequency division multiplexing and/or code division multiplexing expands to the situation of high order.

When the maximum number of layers of system support is 8, based on the method, first number of layers is less than or equal at 2 o'clock, and the mode of employing code division multiplexing is carried out multiplexing to layer 1 and layer 2, and Resource Unit expense is 12RE/RB simultaneously; When number of layers is greater than 2, the multiplex mode that adopts code division multiplexing to mix with frequency division and/or time-division carries out multiplexing, and Resource Unit expense is 24RE/RB simultaneously.

When adopting frequency division multiplexing with frequency division multiplexing and/or time division multiplexing hybrid multiplex, can divide into groups to different layers, the multiplex mode of employing frequency division multiplexing in same group, does not adopt the multiplex mode of time-division and/or frequency division between on the same group.Packet mode comprises following several mode:

Mode 1: $\left\{\begin{array}{c}\mathrm{Group}1=\{l_1^1,l_2^1,l_3^1,l_4^1\}=\left\{\mathrm{1,2,5,7}\right\}\\ \mathrm{Group}2=\{l_1^2,l_2^2,l_3^2,l_4^2\}=\left\{\mathrm{3,4,6,8}\right\}\end{array}\right.$

Mode 2: $\left\{\begin{array}{c}\mathrm{Group}1=\{l_1^1,l_2^1,l_3^1,l_4^1\}=\{\mathrm{1,2},5,6\}\\ \mathrm{Group}2=\{l_1^2,l_2^2,l_3^2,l_4^2\}=\left\{\mathrm{3,4,7,8}\right\}\end{array}\right.$

Fig. 6-1 has provided a kind of concrete mapping method based on this thought.In the drawings, the mode of grouping be take mode 1 as example, and { 1,2,5,7} layer belongs to group 1, and { 3,4,6,8} layer belongs to group 2.

When number of layers is less than or equal to 2, layer 1 and layer 2 adopt the code word that code length is 2 to carry out multiplexing; When number of layers is 3 or 4, on the basis of layer 1 and layer 2, by the mode of frequency division multiplexing, be layer 3 and other 12 RE of layer 4 distribution, layer 3 and layer 4 carry out code division multiplexing, and the code length of code division multiplexing is still 2.When number of layers is greater than 4, adopt the code word that code length is 4 to carry out code division multiplexing, wherein each layer in Group1 carries out code division multiplexing, and each in Group2 layer carries out code division multiplexing, and the layer between Group1 and Group2 carries out code division multiplexing by time-division and/or frequency division.When different layers number, each layer of corresponding resource unit group is respectively:

Number of layers is 1 or 2 o'clock, layer l ₁ ¹and l ₂ ¹carry out code division multiplexing, and take identical resource unit group (as Fig. 6-1A):

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{1,\mathrm{6,11}\}\end{array}\right.$

The Resource Unit position relationship that each group takies is as follows:

L ₁ ¹and l ₂ ¹: { (x ₁, y ₁), (x ₁, y ₂), (x ₁, y ₃), (x ₂, y ₁), (x ₂, y ₂), (x ₂, y ₃), (x ₃, y ₁), (x ₃, y ₂), (x ₃, y ₃), (x ₄, y ₁), (x ₄, y ₂), (x ₃, y ₃), code length is 2, same time slot, and the RE on two OFDM symbols of same frequency domain position carries out multiplexing, and at this moment, mapping mode is with in embodiment 1, and the mapping mode when number of layers is 1 or 2 is identical.

When number of layers is 3 or 4, layer l ₁ ¹and l ₂ ¹carry out code division multiplexing, and take identical resource unit group; Layer l ₁ ²and l ₂ ²carry out code division multiplexing, and take identical resource unit group.Layer is 4 o'clock, and the corresponding sets of resource units of all layers is (as Fig. 6-1B):

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

The Resource Unit position relationship that each group takies is as follows:

L ₁ ¹and l ₂ ¹the resource unit group that layer is corresponding is: { (x ₁, y ₁), (x ₁, y ₃), (x ₁, y ₅), (x ₂, y ₁), (x ₂, y ₃), (x ₂, y ₅), (x ₃, y ₁), (x ₃, y ₃), (x ₃, y ₅), (x ₄, y ₁), (x ₄, y ₃), (x ₄, y ₅), code length is 2, same time slot, and the RE on two OFDM symbols of same sub-carrier positions carries out multiplexing, concrete, the RE of mapping DMRS is divided into 6 groups: { (x ₁, y ₁), (x ₂, y ₁), { (x ₃, y ₁), (x ₄, y ₁), { (x ₁, y ₃), (x ₂, y ₃), { (x ₃, y ₃), (x ₄, y ₃), { (x ₁, y ₅), (x ₂, y ₅), { (x ₃, y ₅), (x ₄, y ₅), between two RE in same group by walsh code to layer l ₁ ¹with layer l ₂ ¹demodulation reference mark to carry out CDM multiplexing.

L ₁ ²and l ₂ ²corresponding resource unit group is: { (x ₁, y ₂), (x ₁, y ₄), (x ₁, y ₆), (x ₂, y ₂), (x ₂, y ₄), (x ₂, y ₆), (x ₃, y ₂), (x ₃, y ₄), (x ₃, y ₆), (x ₄, y ₂), (x ₄, y ₄), (x ₄, y ₆), code length is 2, same time slot, and the RE on two OFDM symbols of same sub-carrier positions carries out multiplexing, concrete, the DMRS RE of this group mapping is divided into 6 groups: { (x ₁, y ₂), (x ₂, y ₂), { (x ₃, y ₂), (x ₄, y ₂), { (x ₁, y ₄), (x ₂, y ₄), { (x ₃, y ₄), (x ₄, y ₄), { (x ₁, y ₆), (x ₂, y ₆), { (x ₃, y ₆), (x ₄, y ₆), between two RE in same group by walsh code to layer l ₁ ²with layer l ₂ ²demodulation reference mark to carry out CDM multiplexing.

When number of layers is when being greater than 4, layer { l ₁ ¹, l ₂ ¹, l ₃ ¹, l ₄ ¹carry out code division multiplexing, and take identical resource unit group; Layer { l ₁ ², l ₂ ², l ₃ ², l ₄ ²carry out code division multiplexing, and take identical resource unit group, the resource unit group taking equals identical (as Fig. 6-1C) at 4 o'clock with layer.

{ l ₁ ¹, l ₂ ¹, l ₃ ¹, l ₄ ¹}: { (x ₁, y ₁), (x ₁, y ₃), (x ₁, y ₅), (x ₂, y ₁), (x ₂, y ₃), (x ₂, y ₅), (x ₃, y ₁), (x ₃, y ₃), (x ₃, y ₅), (x ₄, y ₁), (x ₄, y ₃), (x ₃, y ₅), code length is in 4, one RB, same sub-carrier positions, and 4 RE on different OFDM symbols carry out code division multiplexing.Concrete, the DMRS RE of this group mapping is divided into 3 groups: { (x ₁, y ₁), (x ₂, y ₁), (x ₃, y ₁), (x ₄, y ₁), { (x ₁, y ₃), (x ₂, y ₃), (x ₃, y ₃), (x ₄, y ₃), { (x ₁, y ₅), (x ₂, y ₅), (x ₃, y ₅), (x ₄, y ₅), between 4 RE in same group by walsh code to layer l ₁ ¹, l ₂ ¹, l ₃ ¹, l ₄ ¹demodulation reference mark carry out code division multiplexing.

{ l ₁ ², l ₂ ², l ₃ ², l ₄ ²}: { (x ₁, y ₂), (x ₁, y ₄), (x ₁, y ₆), (x ₂, y ₂), (x ₂, y ₄), (x ₂, y ₆), (x ₃, y ₂), (x ₃, y ₄), (x ₃, y ₆), (x ₄, y ₂), (x ₄, y ₄), (x ₃, y ₆), code length is in 4, one RB, same sub-carrier positions, and 4 RE on different OFDM symbols carry out code division multiplexing.Concrete, the DMRS RE of this group mapping is divided into 3 groups: { (x ₁, y ₂), (x ₂, y ₂), (x ₃, y ₁), (x ₄, y ₂), { (x ₁, y ₄), (x ₂, y ₄), (x ₃, y ₄), (x ₄, y ₄), { (x ₁, y ₆), (x ₂, y ₆), (x ₃, y ₆), (x ₄, y ₆), between 4 RE in same group by walsh code to layer l ₁ ², l ₂ ², l ₃ ², l ₄ ²demodulation reference mark carry out code division multiplexing.

Similar with embodiment 1, when last OFDM symbol is for other purposes, for example during the switching of relay, time domain value can be modified to: x ∈ { x ₁, x ₂, x ₃, x ₄}={ 5,6,9,11}.If while considering can to carry out joint channel estimation between adjacent RB, can frequency domain position be revised, number of layers is less than or equal at 2 o'clock and is modified to y ∈ { y ₁, y ₂, y ₃}={ 2,6,10}; Number of layers is greater than at 2 o'clock and is modified to y ∈ { y ₁, y ₂, y ₃, y ₄, y ₅, y ₆}={ 2,3,6,7,10,11}.

When number of layers is less than or equal to 2, expense adopts 8RE/RB, and number of layers is greater than at 2 o'clock, and expense adopts 16RE/RB.Design philosophy is now similar to above-described mode, only need on above-mentioned basis, in number of layers, be less than or equal at 2 o'clock, removes two value values of the centre in frequency domain set, and corresponding sets of resource units is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4\}=\{3,9\}\end{array}\right.$

When number of layers is greater than 2, corresponding sets of resource units is:

$\left\{\begin{array}{c}x\∈\{x_1,x_2\}=\left\{\mathrm{5,6,11,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4\}=\{\mathrm{3,4},\mathrm{9,10}\}\end{array}.\right.$

The Resource Unit position relationship that each group takies is:

Number of layers is less than or equal at 2 o'clock:

L ₁ ¹and l ₂ ¹: { (x ₁, y ₁), (x ₂, y ₂), (x ₂, y ₁), (x ₂, y ₂), (x ₃, y ₁), (x ₃, y ₂), (x ₄, y ₁), (x ₄, y ₂), code length is 2, same time slot, and the RE on two OFDM symbols of same frequency domain position carries out multiplexing.

Number of layers is 3 or 4 o'clock:

L ₁ ¹and l ₂ ¹: { (x ₁, y ₁), (x ₁, y ₃), (x ₂, y ₁), (x ₂, y ₃), (x ₃, y ₁), (x ₃, y ₃), (x ₄, y ₁), (x ₄, y ₃), code length is 2, same time slot, and the RE on two OFDM symbols of same sub-carrier positions carries out multiplexing.

L ₁ ²and l ₂ ²: { (x ₁, y ₂), (x ₁, y ₄), (x ₂, y ₂), (x ₂, y ₄), (x ₃, y ₂), (x ₃, y ₄), (x ₄, y ₂), (x ₄, y ₄), code length is 2,, same time slot, the RE on two OFDM symbols of same sub-carrier positions carries out multiplexing.

Number of layers is greater than at 4 o'clock:

{ l ₁ ¹, l ₂ ¹, l ₃ ¹, l ₄ ¹}: { (x ₁, y ₁), (x ₁, y ₃), (x ₂, y ₁), (x ₂, y ₃), (x ₃, y ₁), (x ₃, y ₃), (x ₄, y ₁), (x ₄, y ₃), code length is in 4, one RB, same sub-carrier positions, and 4 RE on different OFDM symbols carry out code division multiplexing.

{ l ₁ ², l ₂ ², l ₃ ², l ₄ ²}: { (x ₁, y ₂), (x ₁, y ₄), (x ₂, y ₂), (x ₂, y ₄), (x ₃, y ₂), (x ₃, y ₄), (x ₄, y ₂), (x ₄, y ₄), code length is in 4, one RB, same sub-carrier positions, and 4 RE on different OFDM symbols carry out code division multiplexing.

Same, when last OFDM symbol is for other purposes, for example during the switching of relay, time domain value can be modified to: x ∈ { x ₁, x ₂, x ₃, x ₄}={ 5,6,9,11}.If while not considering to carry out joint channel estimation between adjacent RB, can frequency domain position be revised, number of layers is less than or equal at 2 o'clock, y ∈ { y ₁, y ₂, y ₃}={ 1,11}; Number of layers is greater than at 2 o'clock and is modified to y ∈ { y ₁, y ₂, y ₃, y ₄, y ₅, y ₆}={ 1,2,11,12}.

Under design based on CDM and FDM and/or TDM hybrid multiplex, only have an OFDM symbol to keep for the design of CSI-RS in the above.When being thought of as the reserved OFDM symbol of CSI-RS, pattern that can be based on 3 OFDM Design of Symbols DMRS.And Resource Unit expense can be set to respectively 10RE/RB and 18RE/RB in low-rank (being less than or equal to 2 layers) and high order (being greater than 2 layers) situation.

Corresponding, when number of layers is less than or equal to 2, one group of RE of distribution can be expressed as (as Fig. 6-2A):

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3\}=\left\{\mathrm{5,9,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

That concrete is { (x ₁, y ₁), (x ₁, y ₂), (x ₁, y ₅), (x ₁, y ₆), (x ₂, y ₃), (x ₂, y ₄), (x ₃, y ₁), (x ₃, y ₂), (x ₃, y ₅), (x ₃, y ₆)

Corresponding, when number of layers is 3 or 4, one group of RE of distribution can be expressed as (as Fig. 6-2B):

$\left\{\begin{array}{c}x\∈\{x_1,x_2{,x}_3\}=\left\{\mathrm{5,9,12}\right\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

A kind of concrete method of salary distribution is:

Layer 1 and layer 2 Multiplexing Unit group: { (x ₁, y ₁), (x ₁, y ₂), (x ₁, y ₅), (x ₁, y ₆), (x ₂, y ₃), (x ₂, y ₄), (x ₃, y ₁), (x ₂, y ₂), (x ₃, y ₅), (x ₃, y ₆)

Layer 3 and layer 4 Multiplexing Unit group: { (x ₁, y ₃), (x ₁, y ₄), (x ₂, y ₁), (x ₂, y ₂), (x ₂, y ₅), (x ₂, y ₆), (x ₃, y ₃), (x ₃, y ₄)

When number of layers is greater than 4, one group of RE of distribution can be expressed as (as Fig. 6-2C):

$\left\{\begin{array}{c}x\∈\{x_1,x_2,x_3\}=\{5,\mathrm{9,12}\}\\ y\∈\{y_1,y_2,y_3,y_4,y_5,y_6\}=\{\mathrm{1,2},\mathrm{6,7,11,12}\}\end{array}\right.$

A kind of concrete method of salary distribution is:

Layer 1,2,5,6 Multiplexing Unit group: { (x ₁, y ₁), (x ₁, y ₂), (x ₁, y ₅), (x ₁, y ₆), (x ₃, y ₁), (x ₃, y ₂), (x ₃, y ₅), (x ₃, y ₆)

Layer 3,4,7,8 Multiplexing Unit group: { (x ₁, y ₃), (x ₁, y ₄), (x ₃, y ₃), (x ₃, y ₄)

Only have layer 1,2 multiplexing position: { (x ₂, y ₃), (x ₂, y ₄)

Only has the multiplexing position of layer 3,4: { (x ₃, y ₁), (x ₂, y ₂), (x ₂, y ₅), (x ₂, y ₆)

In the design of this scheme, taken into full account the applied probability of different layers, i.e. the less layer of probability of use, the RE density of distribution is lower.

Same, when last OFDM symbol is for other purposes, for example during the switching of relay, time domain value can be modified to: x ∈ { x ₁, x ₂, x ₃}={ 5,9,11}; If while considering can to carry out joint channel estimation between adjacent RB, can be modified to y ∈ { y to frequency domain position ₁, y ₂, y ₃}={ 2,6,10}.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (14)

1. a mapping method for demodulation reference symbol in expansion of cyclic prefix in advanced long-term evolution system, is characterized in that, comprising:

The time-domain position of demodulation reference mark of carrying advanced long-term evolution system is positioned at not by shared OFDM (OFDM) symbol of control channel, common reference symbol and witness mark symbol, and therefrom selects one or more OFDM symbols for carrying described demodulation reference mark;

Demodulation reference mark between a plurality of layers is divided by frequency division, time-division, code or the mode of multiple multiplex mode mixing is carried out orthogonal multiplex;

Wherein, the multiplex mode adopting between described a plurality of layer is any one in following mode:

Mode one, in number of layers, be less than or equal at 2 o'clock, between each layer, adopt the mode of code division multiplexing; In number of layers, be greater than at 2 o'clock, the hybrid multiplex mode that adopts code division multiplexing to combine with frequency division and/or time division multiplexing between each layer;

Mode two, in number of layers, be less than or equal to 2 or be less than or equal at 4 o'clock, between each layer, adopt frequency division and/or time-multiplexed mode; In number of layers, be greater than 2 or be greater than at 4 o'clock, between each layer, adopt the hybrid multiplex mode that frequency division and/or time-division combine with code minute.

2. method according to claim 1, is characterized in that, the compound mode of carrying the OFDM symbol of described demodulation reference mark is any one in three kinds of modes below adopting:

A1, described demodulation reference mark maximum take 4 OFDM symbols, and are mapped on the 5th, the 6th, the 11st and the 12nd OFDM symbol or on the 5th, the 6th, the 9th and the 11st OFDM symbol;

A2, described demodulation reference mark maximum take 2 OFDM symbols, and are mapped on the 5th and the 12nd OFDM symbol or on the 5th and the 11st OFDM symbol;

A3, described demodulation reference mark maximum take 3 OFDM symbols, and be mapped on the 5th, the 9th and the 12nd OFDM symbol, or 5th, on the 8th and the 12nd OFDM symbol, or on the 5th, the 9th and the 11st OFDM symbol or on the 5th, the 8th and the 11st OFDM symbol.

3. method according to claim 1, it is characterized in that, according to the number of layers of the actual use of system, layer is classified, map type for given number of layers interval, described a plurality of layers are divided into groups, between the respective layer of described grouping, adopt different multiplex modes, concrete packet mode is any one in following mode:

In C1, same group, adopt the mode of code division multiplexing, between group, adopt the mode of time-division and/or frequency division multiplexing;

In C1, same group, adopt the mode of time-division and/or frequency division multiplexing, between group, adopt the mode of code division multiplexing.

4. method according to claim 3, is characterized in that, every layer in inhomogeneity adopts identical or different average pilot density; Between of a sort different layers, it is identical that the density of the demodulation data reference signal of every layer keeps.

5. according to the method described in any one claim in claim 1 to 4, it is characterized in that, the number of layers of using according to reality is divided into the mapping of low-rank class and the mapping of high order class by the type of mapping, for described low-rank class mapping, the demodulation reference mark overhead on all layers is 8RE/RB or 12RE/RB; For described high order class mapping, the overhead of the demodulation reference mark on all layers is 24RE/RB, or 16RE/RB, or 18RE/RB.

6. method according to claim 1, is characterized in that, the selection mode of the time-domain position of described demodulation reference mark is any one in following mode:

D1, when adopting code division multiplexing or code division multiplexing and frequency division and/or time division mixed multiplexing mode between different layers, the time-domain position of described demodulation reference mark is positioned on the 5th, the 6th OFDM symbol and the 11st, the 12nd OFDM symbol or the 5th, the 6th OFDM symbol and the 9th, the 11st Resource Unit that OFDM symbol is corresponding of a Resource Block;

D2, when adopting frequency division and/or time division multiplexing mode between different layers, the time-domain position of demodulation reference mark is positioned at the 5th, the 9th and the 12nd OFDM symbol of a Resource Block, or the 5th, the 9th and the 11st OFDM symbol.

7. method according to claim 1, is characterized in that, on each OFDM symbol, two Adjacent resource unit of every layer of demodulation reference mark be spaced apart 3 or 4 Resource Units; Or on each OFDM symbol, adjacent two demodulation reference mark of same layer be spaced apart 2 or 3 Resource Units.

8. a mapping device for demodulation reference symbol in expansion of cyclic prefix in advanced long-term evolution system, is characterized in that,

Described mapping device is for adopting the Resource Block of extended cyclic prefix to shine upon demodulation reference mark;

Described mapping device is in time domain direction, never in the OFDM symbol being taken by control channel, common reference symbol and witness mark symbol, select one or more OFDM symbols for carrying described demodulation reference mark, and the mode of mixing by frequency division, time-division, code minute or multiple multiplex mode between a plurality of layer is carried out orthogonal multiplex;

The multiplex mode that described mapping device adopts when the described demodulation reference mark of mapping between a plurality of layers is any one in following mode:

Mode one, in number of layers, be less than or equal at 2 o'clock, between each layer, adopt the mode of code division multiplexing; In number of layers, be greater than at 2 o'clock, the hybrid multiplex mode that adopts code division multiplexing to combine with frequency division and/or time division multiplexing between each layer;

Mode two, in number of layers, be less than or equal to 2 or be less than or equal at 4 o'clock, between each layer, adopt frequency division and/or time-multiplexed mode; In number of layers, be greater than 2 or be greater than at 4 o'clock, between each layer, adopt the hybrid multiplex mode that frequency division and/or time-division combine with code minute.

9. device according to claim 8, is characterized in that, when described mapping device is selected the OFDM symbol of the described demodulation reference mark of carrying, and any one below adopting in three kinds of modes:

E1, described demodulation reference mark maximum take 4 OFDM symbols, and are mapped on the 5th, the 6th, the 11st and the 12nd OFDM symbol or on the 5th, the 6th, the 9th and the 11st OFDM symbol;

E2, described demodulation reference mark maximum take 2 OFDM symbols, and are mapped on the 5th and the 12nd OFDM symbol or on the 5th and the 11st OFDM symbol;

E3, described demodulation reference mark maximum take 3 OFDM symbols, and be mapped on the 5th, the 9th and the 12nd OFDM symbol, or 5th, on the 8th and the 12nd OFDM symbol, or on the 5th, the 9th and the 11st OFDM symbol or on the 5th, the 8th and the 11st OFDM symbol.

10. device according to claim 8, it is characterized in that, described mapping device is classified according to the number of layers of the actual use of system, class for given number of layers interval, described a plurality of layers are divided into groups, between the respective layer of described grouping, adopt different multiplex modes, concrete packet mode is any one in following mode:

In G1, same group, adopt the mode of code division multiplexing, between group, adopt the mode of time-division and/or frequency division multiplexing;

In G2, same group, adopt the mode of time-division and/or frequency division multiplexing, between group, adopt the mode of code division multiplexing.

11. devices according to claim 10, is characterized in that, every layer in inhomogeneity adopts identical or different average pilot density; Between of a sort different layers, it is identical that the density of the demodulation data reference signal of every layer keeps.

Device in 12. according to Claim 8 to 11 described in any one claim, it is characterized in that, the number of layers that described mapping device uses according to reality is divided into the mapping of low-rank class and the mapping of high order class by the type of mapping, for described low-rank class mapping, the demodulation reference mark overhead on all layers is 8RE/RB or 12RE/RB; For described high order class mapping, the overhead of the demodulation reference mark on all layers is 24RE/RB, or 16RE/RB, or 18RE/RB.

13. devices according to claim 8, is characterized in that, described mapping device when selecting the time-domain position of described demodulation reference mark, any one in the following ways:

H1, when adopting code division multiplexing or code division multiplexing and frequency division and/or time division mixed multiplexing mode between different layers, the time-domain position of described demodulation reference mark is positioned on the 5th, the 6th OFDM symbol of a Resource Block and the 11st, the 12nd OFDM symbol or the 5th, the 6th OFDM symbol and the 9th, the 11st Resource Unit that OFDM symbol is corresponding (RE);

H2, when adopting frequency division and/or time division multiplexing mode between different layers, the time-domain position of demodulation reference mark is positioned at the 5th, the 9th and the 12nd OFDM symbol of a Resource Block, or the 5th, the 9th and the 11st OFDM symbol.

14. devices according to claim 8, is characterized in that, described mapping device when hinting obliquely at described demodulation reference mark, on each OFDM symbol, two Adjacent resource unit of every layer of demodulation reference mark be spaced apart 3 or 4 Resource Units; Or adjacent two demodulation reference mark of same layer be spaced apart 2 or 3 Resource Units.