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    • 专利摘要:
    precoding method for a hybrid multiplexing demodulation reference symbol, mapping method of a layer to a multiplexing demodulation reference symbol port, applied in a precoding method based on a hybrid multiplexing dmrs and apparatus for achieving precoding based on a hybrid multiplexing demodulation reference symbol, comprising a mapping module and a precoding module. In the present invention a method of precoding for a hybrid multiplexing demodulation reference symbol (dmrs) is disclosed. the method includes: determining a multiplexing relationship between dmrs ports; make data transport layers correspond to dmrs ports with the given multiplexing ratio; and precoding pilot sequences corresponding to various dmrs ports according to the relationship between data transport layers and dmrs ports. in the present invention there is also disclosed a method of mapping a layer to a multiplexing demodulation reference symbol (dmrs) and an apparatus for achieving precoding based on a hybrid multiplexing demodulation reference symbol (dmrs). as a technical solution of the present invention, interference between layers corresponding to different streams of codewords can be avoided, and the accuracy of channel estimation can be improved. at the same time, since the technical solution of the present invention employs a fixed mapping mode, the probability of random mapping is reduced and the control signaling overhead is also reduced.
    公开号:BR112012019729B1
    申请号:R112012019729-0
    申请日:2010-12-17
    公开日:2021-08-17
    发明作者:Wenfeng Zhang；Yunfeng Sun；Jing Jiang；Junfeng Zhang
    申请人:Zte Corporation；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention relates to advanced long-term evolution technology (LTEA) and, in particular, to a precoding method and apparatus based on a hybrid multiplexing demodulation reference symbol. BACKGROUND OF RELATED TECHNIQUE
    [002] High-order multi-antenna technology is one of the critical technologies of the long-term evolution advanced system (LTEA or Advanced LTE) to improve the system throughput. To achieve channel quality measurement and data demodulation after introducing high-order multi-antenna technology, the Advanced LTE system defines, respectively, two types of pilot symbols: demodulation reference symbol (DMRS) and measurement reference symbol. channel quality (CSIRS), wherein the demodulation reference symbol is a reference symbol used for demodulation of a downlink shared physical channel (PDSCH). The measurement reference symbol is a reference symbol used to measure channel state information (CSI) and also to report information such as channel quality indicator (CQI), precoding matrix indicator (PMI), and rank indicator (RI). The structures of the two types of reference symbols mentioned above can be used to support new LTEA technologies, such as multipoint coordinate transmission (CoMP), spatial multiplexing, etc.
    [003] In LTE, a common reference signal (or cell specific reference signal, CRS) is used for pilot measurement, ie all users use common pilot to perform channel estimation. This common reference signal requires the transmit side to notify the receiving end of the pre-processing mode that is used in the transmitted data, and also the overhead is considerable; moreover, in a multiple user multiple input multiple output system (MUMIMO), since a plurality of user equipment (UE) uses the same CRS, pilot orthogonality cannot be realized, and interference cannot be estimated.
    [004] In the LTEA, to reduce the pilot overhead, the channel quality measurement reference symbol and the demodulation reference symbol are designed separately, and the demodulation reference signal and data employ the same pre mode. -processing. At the same time, the demodulation reference symbol is mapped according to the available rank information of the corresponding channel of a scheduled user, therefore the overhead can be adjusted in a self-adaptive way according to the rank information, so that overhead can be greatly reduced if rank is relatively low.
    [005] In the present discussion, the design pattern of the demodulation reference symbol has already been determined, as shown in Figs. 1(a), 1(b) and 1(c), when the rank used by downlink transmission is less than or equal to 2, the resource unit indicated by S is merely used for DMRS transmission and scrambling is performed on two adjacent Orthogonal Frequency Division Multiplexing (OFDM) symbols in the temporal domain using an orthogonal coverage code (OCC) with its length being 2. The symbol I—I in Figs. 1(a), 1(b) and 1(c) represent the common reference signal (CRS).
    [006] When rank is greater than or equal to 3 and less than or equal to 4, two groups of resource units (RE) are used, respectively shown as and I—I . In this case, orthogonal code division multiplexing (CDM) can be performed in at most 2 DMRS layers in each RE group, and each RE group performs orthogonal scrambling on two adjacent OFDM symbols in the temporal domain using one orthogonal coverage code with its length being 2. When rank is greater than 4, for two RE groups (as shown by I—I and I—I ), each group scrambles orthogonally in the direction of the time domain using a OCC code with its length being 4, and the maximum number of CDM orthogonal multiplexing DMRS layers is 4 in each RE group.
    [007] Furthermore, at present in the case of multiple inputs and multiple outputs of single user (SUMIMO), the mapping mode from codeword stream to layer defines the situation of different numbers of layers, as shown in Fig. 2.
    [008] In LTEA, to support transmission of a maximum of 8 layers, it is necessary to define a maximum of 8 DMRS ports, indicated as DMRS ports 7, 8, 9, 10, 11, 12, 13 and 14. In this case, the DMRS port is a layer-defined antenna port, corresponding to the data transport layer, and is used to estimate the equivalent channel of data from each layer during spatial transmission.
    [009] However, when the UE side performs data demodulation, to be able to perform the demodulation it is necessary to determine that the DMRS corresponding to such DMRS ports occupies the same resource group, and perform code division multiplexing, and use the relationship between the data layer and the gate of the demodulation reference symbol, so as to estimate the corresponding layer channel information and perform detection. SUMMARY OF THE INVENTION
    [0010] Based on the subframe DMRS pattern defined in the related art, how to map the layer demodulation reference symbol corresponding to each codeword stream and map the same into such RE groups are problems to be conceived and taken into account. A good allocation mode is beneficial to improve system performance while reducing signaling overhead; as a result, it is necessary to propose a form of mapping in order to reduce the probability of random mapping and reduce signaling overhead.
    [0011] The technical problem to be solved by the present invention is to provide a method and precoding apparatus based on a hybrid multiplexing demodulation reference symbol, in order to avoid interference between the layers corresponding to different word streams of code.
    [0012] To solve the technical problem mentioned above, a precoding method for a hybrid multiplexing demodulation reference symbol (DMRS) is disclosed in the present invention, and the method comprises:
    [0013] determining a multiplexing relationship between DMRS ports;
    [0014] make data transport layers correspond, respectively, to DMRS ports with the determined multiplexing ratio; and
    [0015] precode pilot sequences corresponding to various DMRS ports according to a relationship between the data transport layers and the DMRS ports.
    [0016] Determining a multiplexing relationship between DMRS ports refers to:
    [0017] classify DMRS ports 7, 8, 11, and 13 as a DMRS port group, classify DMRS ports 9, 10, 12, and 14 as another DMRS port group, where multiple DMRS ports in groups of classified DMRS ports employ a code division multiplexing mode, and different groups of DMRS ports employ a time division and/or frequency division multiplexing mode.
    [0018] Making data transport layers correspond respectively to DMRS ports with the determined multiplexing ratio refers to making the layers correspond to DMRS ports according to any one or a combination of a plurality of the following conditions:
    [0019] make all data transport layers uniformly match the DMRS ports in these two sorted DMRS port groups; and
    [0020] make all layers match the DMRS ports in these two groups of DMRS ports classified according to the relationship between each codeword stream and the data transport layer.
    [0021] Making all layers match the DMRS ports in these two groups of DMRS ports classified according to the relationship between each codeword stream and the data transport layer comprises:
    [0022] make layers of the same codeword stream to match DMRS ports from the same DMRS port group with priority, and make layers of different codeword streams match DMRS ports from different groups of DMRS ports respectively; or
    [0023] make layers of the same codeword stream to match DMRS ports of different DMRS port groups with priority, and make layers of different codeword streams match DMRS ports of the same DMRS port group.
    [0024] In the step of making layers of the same codeword stream match DMRS ports of the same priority DMRS port group and making layers of different codeword streams match DMRS ports of different groups of DMRS ports respectively,
    [0025] when the total number M of layers corresponding to the same codeword stream is greater than the maximum number N of ports supported by a group of DMRS ports, make N layers in all layers corresponding to the same stream codeword match DMRS ports in the same priority DMRS port group, then make the remaining MN layers match DMRS ports in different DMRS port groups; or
    [0026] make N layers in all layers corresponding to the same codeword stream to match the DMRS ports of the different priority DMRS port groups, then make the remaining MN layers match the DMRS ports of the same DMRS port group.
    [0027] Make layers of the same codeword stream match DMRS ports of the same priority DMRS port group, and make layers of different codeword streams match DMRS ports of different DMRS port groups respectively,
    [0028] when all layers correspond to two codeword streams, make the layers corresponding to a codeword stream therein to match the DMRS ports of a group of DMRS ports, and make the corresponding layers to the other codeword stream there correspond the DMRS ports of another DMRS port group.
    [0029] Making data transport layers correspond, respectively, to DMRS ports with the determined multiplexing ratio refers to the following:
    [0030] configure fixed one-to-one mapping relationships according to DMRS layer and port sequence numbers.
    [0031] The method further comprises:
    [0032] when the method is used in a MUMIMO system, take the layers corresponding to the same multiplexing user as being the layers corresponding to the same codeword stream to perform the DMRS layer-to-port mapping.
    [0033] The method further comprises:
    [0034] determine the rank of multiple multiplexing users from high to low according to the total number of layers corresponding to multiple multiplexing users, and allocate DMRS ports in the layers corresponding to each multiplexing user successively according to the locations of the rank.
    [0035] To solve the technical problem mentioned above, an apparatus for mapping a layer to a multiplexing demodulation reference symbol (DMRS) port is also disclosed in the present invention, applied in a precoding method based in a hybrid multiplexing DMRS, where the mapping method comprises:
    [0036] determining a multiplexing relationship between DMRS ports; and
    [0037] make data transport layers correspond, respectively, to DMRS ports with the determined multiplexing ratio.
    [0038] The step of determining a multiplexing relationship between DMRS ports comprises:
    [0039] classify DMRS ports 7, 8, 11, and 13 as a group of DMRS ports, classify DMRS ports 9, 10, 12, and 14 as another group of DMRS ports, where multiple DMRS ports in groups of classified DMRS ports employ a code division multiplexing mode, and different groups of DMRS ports employ a time division and/or frequency division multiplexing mode.
    [0040] In the step of making the data transport layers correspond, respectively, to DMRS ports with the determined multiplexing ratio, the layers are made to correspond to the DMRS ports according to any one or a combination of a plurality of the following conditions:
    [0041] make all data transport layers uniformly match the DMRS ports in these two sorted DMRS port groups; and
    [0042] make all layers match the DMRS ports in these two groups of DMRS ports classified according to a relationship between each codeword stream and the data transport layer.
    [0043] Making all layers match DMRS ports into two groups of DMRS ports classified according to the relationship between each codeword stream and the data transport layer comprises:
    [0044] make layers of the same codeword stream match DMRS ports of the same priority DMRS port group, and make layers of different codeword streams match DMRS ports of different DMRS port groups respectively; or
    [0045] make layers of the same codeword stream match DMRS ports of different DMRS port groups with priority, and make layers of different codeword streams match DMRS ports of the same DMRS port group.
    [0046] The step of making the layers match the DMRS ports further comprises:
    [0047] when the total number M of layers corresponding to the same codeword stream is greater than the maximum number N of ports supported by a group of DMRS ports, make N layers in all layers corresponding to the same stream codeword match DMRS ports in the same priority DMRS port group, then make the remaining MN layers match DMRS ports in different DMRS port groups; or
    [0048] make N layers in all layers corresponding to the same codeword stream to match the DMRS ports of the different priority DMRS port groups, then make the remaining MN layers match the DMRS ports of the same DMRS port group.
    [0049] The step of making the layers match the DMRS ports further comprises: when all layers correspond to two codeword streams, making the layers corresponding to a codeword stream there match the codeword ports. DMRS of one DMRS port group, and having the layers corresponding to the other codeword stream there match the DMRS ports of another DMRS port group.
    [0050] The step of making data transport layers correspond, respectively, to DMRS ports with the determined multiplexing ratio comprises:
    [0051] configure fixed one-to-one mapping relationships according to sequence numbers of DMRS layers and ports.
    [0052] The method further comprises:
    [0053] when the method is used in a MUMIMO system, take the layers corresponding to the same multiplexing user as being the layers corresponding to the same codeword stream to perform the DMRS layer-to-port mapping.
    [0054] The method further comprises:
    [0055] determine the rank of multiple multiplexing users from high to low according to the total number of layers corresponding to multiple multiplexing users, and allocate DMRS ports in the layers corresponding to each multiplexing user successively according to the locations of the rank.
    [0056] To solve the above-mentioned technical problem, an apparatus for achieving precoding based on a hybrid multiplexing demodulation reference symbol (DMRS) is disclosed in the present invention, comprising a mapping module and a precoding module. - encoding, in which
    [0057] the mapping module is configured to: determine a multiplexing ratio between DMRS ports and making data transport layers correspond, respectively, to several DMRS ports with the determined multiplexing ratio; and
    [0058] the precoding module is configured to: precode pilot sequences corresponding to various DMRS ports according to a relationship between the data transport layers and the DMRS ports.
    [0059] The mapping module is configured to determine a multiplexing relationship between DMRS ports according to the following way: classify the DMRS ports 7, 8, 11 and 13 as a group of DMRS ports, classify the DMRS ports DMRS 9, 10, 12, and 14 as another DMRS port group, wherein multiple DMRS ports in two sorted DMRS port groups employ a code division multiplexing mode, and different DMRS port groups employ a mode of time division multiplexing and/or frequency division.
    [0060] The mapping module is configured to make data transport layers correspond, respectively, to multiple DMRS ports with the multiplexing ratio determined according to any one or a combination of two of the following conditions:
    [0061] make all data transport layers uniformly match DMRS ports into two sorted DMRS port groups; and
    [0062] cause all layers to match DMRS ports into two groups of DMRS ports classified according to a relationship between each codeword stream and the data transport layer;
    [0063] in which making all layers match the DMRS ports in these two groups of DMRS ports classified according to the relationship between each codeword stream and the data transport layer comprises:
    [0064] make layers of the same codeword stream match DMRS ports of the same priority DMRS port group, and make layers of different codeword streams match DMRS ports of different DMRS port groups respectively; or
    [0065] make layers of the same codeword stream match DMRS ports of different DMRS port groups with priority, and make layers of different codeword streams match DMRS ports of the same DMRS port group.
    [0066] The mapping module is further configured to make the layers match the DMRS ports as follows:
    [0067] when the total number M of layers corresponding to the same codeword stream is greater than the maximum number N of ports supported by a group of DMRS ports, make N layers in all layers corresponding to the same stream codeword match DMRS ports in the same priority DMRS port group, then make the remaining MN layers match DMRS ports in different DMRS port groups; or
    [0068] make N layers in all layers corresponding to the same codeword stream to match the DMRS ports of the different priority DMRS port groups, then make the remaining MN layers match the DMRS ports of the same DMRS port group;
    [0069] when all DMRS layers correspond to two codeword streams, make the DMRS layers corresponding to a codeword stream there match the DMRS ports of a group of DMRS ports, and do with that the DMRS layers corresponding to the other codeword stream there correspond to the DMRS ports of another DMRS port group.
    [0070] When the apparatus is applied to a MUMIMO system, the mapping module is further configured to determine the rank of multiple multiplexing users from high to low according to the total number of layers corresponding to multiple multiplexing users, and allocate DMRS ports in the layers corresponding to each multiplexing user successively according to rank locations.
    [0071] As a technical solution of the present invention, the interference between layers corresponding to different streams of codewords can be avoided, and the accuracy of the channel estimation can be improved. At the same time, since the technical solution of the present invention employs a fixed mapping mode, the probability of random mapping is reduced and the control signaling overhead is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS
    [0072] Fig. 1(a) is a DMRS pattern of a normal subframe in the LTEA;
    [0073] Fig. 1(b) is a DMRS pattern of a subframe in which a downlink pilot time slot occupies 11 or 12 OFDM symbols in the LTEA;
    [0074] Fig. 1(c) is a DMRS pattern of a subframe in which a downlink pilot time slot occupies 9 or 10 OFDM symbols in the LTEA;
    [0075] Fig. 2 is a schematic diagram of a codeword-to-layer stream mapping relationship in SUMIMO mode;
    [0076] Fig. 3 is a schematic diagram of the precoding procedure proposed in the present invention; and
    [0077] Fig. 4 is a schematic diagram of the configuration of the multiplexing ratio of a DMRS port in this mode. PREFERRED MODALITIES OF THE PRESENT INVENTION
    [0078] Hereinafter, the technical solution of the present invention will be described in detail in combination with the attached drawings and specific embodiments. It should be noted that the modalities of this application and the characteristics of the modalities can be combined with each other if there is no conflict.
    [0079] An apparatus for implementing precoding based on a hybrid multiplexing demodulation reference symbol comprises a mapping module and a precoding module, wherein
    [0080] the mapping module is configured to: determine a relationship between multiple DMRS ports and the RE in the DMRS standard, and make data transport layers correspond, respectively, to multiple DMRS ports with the multiplexing relationship determined; and
    [0081] in this mode, the mapping module classifies DMRS ports 7, 8, 11 and 13 as a group of DMRS ports, classifies DMRS ports 9, 10, 12 and 14 as another group of DMRS ports , wherein several DMRS ports in two groups of classified DMRS ports employ a code division multiplexing mode, and different groups of DMRS ports employ a time division and/or frequency division multiplexing mode;
    [0082] the mapping module can be configured to cause data transport layers to correspond respectively to several DMRS ports with the multiplexing ratio determined according to any one or a combination of a plurality of the following conditions: A ) make all data transport layers uniformly match the DMRS ports in these two sorted DMRS port groups; and B) making all layers match the DMRS ports in these two groups of DMRS ports classified according to the relationship between each codeword stream and the data transport layer;
    [0083] where to make all layers match the DMRS ports in these two groups of DMRS ports classified according to the relationship between each codeword stream and the data transport layer refers to the following:
    [0084] make layers of the same codeword stream match DMRS ports of the same priority DMRS port group, and make layers of different codeword streams match DMRS ports of different DMRS port groups respectively; or
    [0085] make layers of the same codeword stream match DMRS ports of different DMRS port groups with priority, and make layers of different codeword streams match DMRS ports of the same DMRS port group.
    [0086] When the total number M of layers corresponding to the same codeword stream is greater than the maximum number N of ports supported by a group of DMRS ports, the mapping module makes N layers in all layers corresponding to the same codeword stream match the DMRS ports of the same priority DMRS port group, then causes the remaining MN layers to match the DMRS ports in different DMRS port groups; or makes N layers in all layers corresponding to the same codeword stream to match the DMRS ports of the different priority DMRS port groups, then makes the remaining MN layers to match the DMRS ports of the same group of DMRS ports.
    [0087] When all the DMRS layers correspond to two codeword streams, the mapping module can make the DMRS layers corresponding to a codeword stream therein to match the DMRS ports of a group of ports. DMRS, and can make the DMRS layers corresponding to the other codeword stream therein to match the DMRS ports of another DMRS port group.
    [0088] The mapping module can also be configured to establish a fixed relationship between the data transport layers and the DMRS ports.
    [0089] The precoding module is configured to: precode pilot sequences corresponding to various DMRS ports according to the relationship between the data transport layers and the DMRS ports.
    [0090] The above apparatus can be applied in a MUMIMO system, at that time, the mapping module can take the layers corresponding to the same multiplexing user as being the layers corresponding to the same codeword stream to perform the layer mapping for DMRS port, in particular, the mapping module determines the rank of multiple multiplexing users from high to low according to the total number of layers corresponding to multiple multiplexing users, and allocates DMRS ports in the layers corresponding to each user of multiplexing successively according to rank locations.
    [0091] Hereinafter the process of the above apparatus to achieve precoding based on hybrid multiplexing DMRS is introduced, and this process is as shown in Fig. 3, including the following steps:
    [0092] Step 301: a mapping between a DMRS port and a resource unit in a DMRS standard is determined;
    [0093] in this step, the determination of the mapping between DMRS port and DMRS standard consists, in fact, in determining the pilots of such DMRS ports where code division multiplexing is performed and such ports where multiplexing is performed by frequency division, and the particular operation is to classify the DMRS ports into two DMRS port groups, multiple DMRS ports of the same DMRS port group employ code division multiplexing mode, and division multiplexing time and/or frequency division (FDM/TDM) is performed between the DMRS port groups;
    [0094] in this mode, the DMRS ports are classified into two groups, and the first group of DMRS ports includes DMRS ports {7, 8, 11, 13}, and the demodulation reference symbol of that port group of DMRS can be mapped to resources shown by in Figs. 1(a), 1(b) and 1(c) and performs code division multiplexing; the second group of DMRS ports includes DMRS ports {9, 10, 12, 14}, and this group of DMRS ports corresponds to F-! features shown by in Figs. 1(a), 1(b) and 1(c) and performs code division multiplexing. Time division multiplexing and/or frequency division is performed between these two groups of DMRS ports. Taking as an example a normal subframe with normal cyclic prefix (NCP), the mapping relationship between DMRS port and DMRS pattern is as shown in Fig. 4.
    [0095] Step 302: data transport layers are mapped on DMRS ports;
    [0096] in this step, to allow the user equipment to detect data with channels corresponding to various layers, it is necessary to determine the relationship between layer and DMRS port, and the particular corresponding principle follows any one or two of the following principles: A) make all data transport layers uniformly match the DMRS ports in these two sorted DMRS port groups; and B) making each layer match the DMRS port of the DMRS port group according to the relationship between codeword stream and layer.
    [0097] In this case, performing a corresponding operation according to the relationship between codeword stream and layer refers to the following:
    [0098] map the layers of the same codeword stream into the DMRS ports that perform priority code division multiplexing (i.e., map the layers of the same codeword stream into the DMRS ports of the same group of ports DMRS with priority), and mapping the layers of different codeword streams on the DMRS ports corresponding to different code division multiplexing groups respectively (i.e. mapping the layers of different codeword streams on the DMRS ports of different groups of DMRS ports respectively); or
    [0099] map the layers of the same codeword stream into the DMRS ports that perform frequency division multiplexing and/or time division with priority (i.e., map the layers of the same codeword stream into the DMRS ports of different groups of DMRS ports with priority), and mapping the layers of different streams of codewords on the DMRS ports that perform code division multiplexing respectively (i.e. mapping the layers of different streams of codewords on ports from a DMRS port group).
    [00100] During the above mentioned mapping operation, if the total number M of the layers corresponding to a codeword stream is greater than the maximum number N of ports supported by the group of DMRS ports that perform code division multiplexing (ie, the maximum number of orthogonal CDM layers supported by each RE), then N layers in all layers corresponding to the codeword stream are mapped to the DMRS ports of a priority DMRS port group (i.e., make these N layers match the DMRS ports of one DMRS port group), and map the remaining MN layers to the DMRS ports of another DMRS port group.
    [00101] With regard to two codeword streams, the layers corresponding to the codeword stream with more layers can be mapped to the DMRS ports of a group of DMRS ports, and the layers corresponding to the word stream Layers of code with fewer layers can be mapped to the available DMRS ports of another DMRS port group.
    [00102] When determining the relationship between DMRS layer and port, a fixed relationship can also be established between data transport layer and DMRS port;
    [00103] For example, DMRS ports {p0,p1,p2,p3,p4,p5,p6,p7}are defined. On what,
    [00104] when the number of data transport layers is less than or equal to 2, the relationship between DMRS layer and port can be established as follows:

    [00105] when the number of layers is greater than 2 and less than or equal to 4, the relationship between layer and DMRS port can be established as follows:

    [00106] when the number of layers is greater than 4 and less than or equal to 8, the relationship between layer and DMRS port can be established as follows:

    [00107] In this case, in the LTEA, Í p0, p1, p2, p3, p4, p5, p6, p7) are the DMRS ports 7, 8, 9, 10, 11, 12, 13 and 14, respectively.
    [00108] Step 303: precoding is performed on pilot sequences corresponding to DMRS ports according to the relationship between DMRS ports and DMRS layers;
    [00109] during the particular implementation, since the precoding vector used when precoding on DMRS resource units is the same as that used when precoding on data resource units, the vector of precoding corresponding to each layer corresponds to the precoding vector used by the DMRS corresponding to that layer. Since the same codeword stream uses the same encoder mode of modulation, when performing layer allocation, consecutive layers are preferably allocated in the same codeword stream.
    [00110] The form of data precoding can be represented as in formula (1)

    [00111] where wi represents the precoding vector corresponding to layer i and is a column vector P *1 , P represents the number of physical antennas; si represents the data of layer i and is a line vector, where it represents the length of the data of each layer, and L represents the number of layers.
    [00112] Since the RE corresponding to DMRS employs the same processing precoding weight with the data, the DMRS resource units of the DMRS antenna ports corresponding to iaiaemi will employ a weight corresponding to the layer.
    [00113] In the present invention it is also proposed a DMRS layer-to-port mapping method based on hybrid multiplexing DMRS, and this method is a particular method of implementing the operations of steps 301 and 302 in the precoding method mentioned above .
    [00114] Hereinafter, the particular implementation of DMRS layer-to-port mapping in combination with particular application scenarios will be described.
    [00115] Mode 1
    [00116] This modality takes as an example a SUMIMO system to describe the method of mapping the codeword stream layer to DMRS port. In SUMIMO, when the total number of layers corresponding to each codeword stream is less than or equal to the number of orthogonal code division multiplexing layers supported by the RE corresponding to each group of CDM multiplexing DMRS ports (i.e., the maximum number of ports supported in the DMRS port group), the mapping mode is as follows:
    [00117] the DMRS ports of each layer corresponding to the same codeword stream employ the same multiplexing mode (i.e., the layers corresponding to the same codeword stream are mapped to the DMRS ports of the same DMRS group) , such as code division multiplexing mode; the same multiplexing mode or different multiplexing mode is used between DMRS ports of layers corresponding to different codeword streams (i.e., layers corresponding to different codeword streams are mapped to DMRS ports of different groups of DMRS ports or correspond to DMRS ports in the same DMRS port group), such as frequency division multiplexing or code division multiplexing mode.
    [00118] In particular, each layer corresponding to the same codeword stream is mapped into a group of DMRS ports using CDM multiplexing, such as RE location shown by or RE location shown by in Fig. 1. Each corresponding layer to different streams of codewords is mapped to DMRS ports of different CDM groups.
    [00119] That is to say, the DMRS port of each layer corresponding to the same codeword stream employs the FDM/TDM multiplexing mode (that is, it makes the layers corresponding to the same codeword stream to match the DMRS ports of different DMRS port groups), and the DMRS ports of each layer corresponding to different codeword streams employ the priority CDM group multiplexing mode (i.e. maps the layers corresponding to different codeword streams code words on DMRS ports of the same DMRS port group).
    [00120] When the total number M of layers corresponding to a given codeword stream is greater than the number N of code division orthogonal multiplexing ports supported by each group of CDM multiplexing REs, the mapping method is the following: multiplexing the layers corresponding to the same codeword stream according to the same priority multiplexing mode (i.e. first map N layers of the maximum number of ports supported by a group of the DMRS ports of a group of DMRS ports), and as for the remaining layers in the same codeword stream, can be multiplexed according to different multiplexing modes (i.e., the remaining (MN) layers are made to match the DMRS ports of another DMRS port group).
    [00121] Taking as an example 2 streams of codewords, assuming rank12, the corresponding DMRS ports are p0 and p1, and the DMRSs corresponding to p0 and p1 are multiplexed in code division mode; when rank34, the corresponding DMRS ports are {p0, p1, p2, p3}, and code division multiplexing is performed on p0and p1, corresponding to RE shown by in Figs. 1(a), 1(b) and 1(c), and OCC code multiplexing with its length being 2 is used in the temporal domain direction; and code division multiplexing is performed on p2e p3, corresponding to RE I-! shown by in Fig. 1, and OCC code multiplexing with its length being 2 is used in the temporal domain direction. When rank58, the corresponding DMRS ports are {p0, p1, p2, p3, p4, p5,p6, p7}and code division multiplexing is performed on the DMRSs corresponding to p0, p1, p4e p6, corresponding to RE shown by in Figs. 1(a), 1(b) and 1(c), and OCC code multiplexing with its length being 4 is used in the temporal domain direction; code division multiplexing is performed on the DMRSs corresponding to p2, I-! p3, p5 and p7, corresponding to RE shown by in Fig. 1, and OCC code multiplexing with its length being 4 is used in the temporal domain direction.
    [00122] When the DMRS corresponding to each layer of the same codeword stream employs priority CDM and the DMRS corresponding to each layer of different codeword streams employs FDM/TDM with priority, in the case of different numbers of layers, the mapping mode of each layer corresponding to a codeword stream to a DMRS port is as shown in Table 11, and CWi represents the 9th codeword stream in the table.
    [00123] Table 11 Mapping mode of each layer corresponding to a codeword stream to a DMRS port in case of different numbers of layers




    [00124] When the DMRS corresponding to each layer of the same codeword stream employs FDM/TDM with priority, the DMRS corresponding to each layer of different codeword stream employs CDM with priority. The mapping mode of each layer corresponding to a codeword stream to a DMRS port in case of different layer numbers is as shown in Table 12.
    [00125] Table 12 Mapping mode of each layer corresponding to a codeword stream to a DMRS port in case of different layer numbers



    [00126] Taking as an example P=8,L=4, according to equation (1), the precoding vectors corresponding to 4 layers are, respectively, and at the same time assume that the number of word streams of code is 2 and CW0 corresponds to layer 0 and layer 1, and CW 1 corresponds to layer 1 and layer 2.
    [00127] According to the mapping mode of Table 11, the layers of the same codeword stream correspond to priority code division multiplexing DMRS ports. As corresponding mode with the index being 5
    in Table 11; layer 0 corresponds to DMRS port 0, layer 1 corresponds to DMRS port 1, layer 2 corresponds to DMRS port 2, and layer 3 corresponds to DMRS 3 port, that is, the layers of the same stream of codeword correspond to code division multiplexing DMRS ports. As a result, when performing precoding in DMRS, DMRS 03 ports correspond to weights [w0,w1,w2,w3]respectively. However, since frequency division multiplexing is performed on the group of DMRS ports {0, 1} and {2, 3}, the corresponding ways of precoding two groups of DMRSs are
    respectively, where ri corresponds to the demodulation reference symbol corresponding to DMRS gate i. The pre-encoded data is mapped to the corresponding resource units according to the DMRS standard.
    [00128] According to the mapping mode of Table 12, the layers of the same codeword stream correspond to priority frequency division multiplexing DMRS ports. As a corresponding mapping mode with the index being 5
    in Table 12; layer 0 corresponds to DMRS port 0, layer 1 corresponds to DMRS port 2, layer 2 corresponds to DMRS port 1, and layer 3 corresponds to DMRS 3 port, that is, the same word stream from code corresponds to frequency division multiplexing ports. At this moment, when performing precoding in DMRS, DMRS 03 ports correspond to weights wwww 0 2 1 3 , , ,  respectively. At this time, the precoding forms corresponding to the DMRSs of two CDM groups are
    respectively, and the pre-encoded data is mapped into the corresponding resource units according to the DMRS standard.
    [00129] In the LTEA, ports p0, p1, p2, p3, p4, p5, p6, p7 correspond to ports 7, 8, 9, 10, 11, 12, 13 and 14, respectively.
    [00130] Modality 2
    [00131] This modality takes as an example a MUMIMO system to describe the process of mapping the layers corresponding to a code word stream for DMRS ports. In MUMIMO, the rule for allocating a DMRS port to each user is as follows: with regard to each user, several layers corresponding to the same user are mapped to DMRS ports with the same multiplexing mode.
    [00132] In this case, the same multiplexing mode refers to the following: layers corresponding to the same user are mapped to DMRS ports of the port group employing priority CDM, or layers corresponding to the same user are mapped to ports DMRS ports of the port group employing FDM/TDM with priority (that is, the DMRS ports of different DMRS port groups). The configuration of the MUMIMO definition includes the following parameters:
    [00133] the maximum number of layers supported by the MUMIMO system, the maximum number of multiplexing users supported and the maximum number of layers transmitted by each multiplexing user;
    [00134] the values of the 3 parameters above can be represented with {n1, n2, n3}respectively.
    [00135] Hereinafter it will be described taking as an example several different configurations of MUMIMO.
    [00136] When the MUMIMO setting is {4, 2, 2}, if, in MUMIMO, it allows using a maximum of 4 layers for transmission and the maximum number of users supported is 2, and each user supports a maximum of 2 layers, the particular relationship is as shown in Tables 21 and 22. In this case, Table 21 shows the situation where layers of the same user are mapped with priority into a group of DMRS ports where code division multiplexing is performed, and Table 22 shows the situation where layers of the same user are mapped with priority into different code division multiplexing groups of DMRS ports.
    [00137] Table 21 Layers of the same user are mapped with priority into a CDM multiplexing DMRS port group

    [00138] Table 22 Layers of the same user are mapped into a priority FDM/TDM multiplexing DMRS port group

    [00139] When MUMIMO setting is {4,4.2} , if MUMIMO supports multiplexing of maximum 4 users, each user at most can support 2 layers for transmission, and in MUMIMO, at most allows to use 4 layers, the mapping relationship is as shown in Tables 23 and 24. In this case, Table 23 shows the situation where layers of the same user are mapped with priority into a group of DMRS ports where code division multiplexing is performed, and the Table 24 shows the situation where layers of the same user are mapped with priority into different code division multiplexing DMRS port groups.
    [00140] Table 23 Layers of the same user are mapped with priority into a code division multiplexing DMRS port group

    [00141] Table 24 Layers of the same user are mapped with priority into an FDM/TDM multiplexing DMRS port group

    [00142] When MUMIMO setting is {4, 4.1}, if MUMIMO supports multiplexing of 4 users at most, each user at most can support 1 layer for transmission, and in MUMIMO, at most allows to use 4 layers, the mapping relationship is as shown in Tables 25 and 26. In this case, Table 25 shows the situation where layers of the same user are mapped with priority into a group of DMRS ports where code division multiplexing is performed, and Table 26 shows the situation where layers of the same user are mapped with priority to different code division multiplexing DMRS port groups.
    [00143] Table 25 Layers of the same user are mapped with priority into a CDM multiplexing DMRS port group


    [00144] Table 26 Layers of the same user are mapped with priority into an FDM/TDM multiplexing DMRS port group

    [00145] Modality 3
    [00146] In this modality, SUMIMO and MUMIMO employ a unified layer to DMRS port mapping mode, and considering that SUMIMO and MUMIMO employ a fixed layer to DMRS port mapping, a fixed relationship can be established between the layer and the DMRS port, and DMRS ports ^p0, p1,p2,p3,p4,p5,p6,p7^ are defined. In particular, it is as follows:
    [00147] when the number of layers is less than or equal to 2, the relationship between layer and DMRS port can be established as follows:

    [00148] when the number of layers is greater than 2 and less than or equal to 4, the relationship between layer and DMRS port can be established as follows:

    [00149] when the number of layers is greater than 4 and less than or equal to 8, the relationship between layer and DMRS port can be established as follows:

    [00150] In this case, in the LTEA, ^p0, p1,p2,p3,p4,p5,p6,p 7^ are the DMRS ports 7, 8, 9, 10, 11, 12, 13 and 14 respectively.
    [00151] Professionals will understand that all or part of the steps in the methods mentioned above can be completed by means of relevant hardware instruction by programs, and programs can be stored in a computer-readable storage medium, such as read-only memory, magnetic disk, or optical disk, etc. Optionally, all or part of the steps of the modalities mentioned above can also be implemented using one or more integrated circuits. Consequently, modules/units in the aforementioned embodiments can be implemented in the form of hardware and can also be implemented in the form of software function modules. The present invention is not limited to any specific combination of hardware and software.
    [00152] The above description is only intended to illustrate the preferred embodiments, but not to limit the present invention. Various alternatives and modifications of the present invention are clear to practitioners. Any modification, equivalent replacement and improvement, and so forth, made within the spirit and principle of the present invention shall be included within the scope of protection of the appended claims of the present invention. INDUSTRIAL APPLICABILITY
    [00153] As a technical solution of the present invention, the interference between the corresponding layers of different streams of codewords can be avoided, and the accuracy of the channel estimation can be improved. At the same time, since the technical solution of the present invention employs a fixed mapping mode, the probability of random mapping is reduced and the control signaling overhead is also reduced.
    权利要求:
    Claims (8)
    [0001]
    1. METHOD OF MAPPING A LAYER TO A MULTIPLEXING DEMODULATION REFERENCE SYMBOL, DMRS, PORT, APPLIED IN A PRECODING METHOD BASED ON A MULTIPLEXING DMRS, comprising: determining (301) a multiplexing ratio between ports of DMRS; and mapping (302) data transport layers, respectively, to DMRS ports with the given multiplexing ratio, characterized in that when mapping data transport layers, respectively, to DMRS ports with the given multiplexing ratio, a fixed ratio is defined between the data transport layer and the DMRS ports,
    [0002]
    2. METHOD according to claim 1, further comprising: precoding (303) pilot sequences corresponding to several DMRS ports according to a relationship between the data transport layers and the DMRS ports.
    [0003]
    3. METHOD, according to claim 1, characterized in that the step of mapping data transport layers, respectively, to DMRS ports with the determined multiplexing ratio refers to mapping the layers to DMRS ports according to any one or a combination of a plurality of the following conditions: uniformly mapping all data transport layers of DMRS ports into two sorted DMRS port groups; map all the DMRS ports layers into two groups of DMRS ports classified according to a relationship between each codeword stream and the data transport layer.
    [0004]
    4. METHOD according to claim 3, characterized in that the step of mapping all layers of the DMRS ports into two groups of DMRS ports classified according to the relationship between each codeword stream and the transport layer. data comprising: mapping layers of the same codeword stream to DMRS ports of the same priority DMRS port group, and mapping layers of different codeword streams to DMRS ports of different DMRS port groups respectively; or mapping layers of the same codeword stream to DMRS ports of different priority DMRS port groups, and mapping layers of different codeword streams to DMRS ports of the same DMRS port group.
    [0005]
    5. METHOD according to claim 4, characterized in that, in the step of mapping layers of the same codeword stream the DMRS ports of the same group of priority DMRS ports and mapping the layers of different codeword streams the DMRS ports of different DMRS port groups respectively, when the total number M of layers corresponding to the same codeword stream is greater than the maximum number N of ports supported by a DMRS port group, map N layers in all layers corresponding to the same codeword stream the DMRS ports of the same DMRS port group with priority, then map the remaining MN layers to the DMRS ports of different DMRS port groups, or map N layers in all the layers corresponding to the same codeword stream the DMRS ports of different priority DMRS port groups, then map the remaining MN layers to the DMRS ports of the same port group of DMRS; or when all said layers correspond to two codeword streams, mapping layers corresponding to a codeword stream onto them the DMRS ports of a group of DMRS ports, and mapping layers corresponding to the other codeword stream as DMRS ports from another DMRS port group.
    [0006]
    6. METHOD according to claim 1 or 2, characterized in that the step of mapping data transport layers, respectively, to DMRS ports with the determined multiplexing ratio refers to the following: configuring fixed mapping relations one- to-one according to DMRS layer and port sequence numbers.
    [0007]
    7. APPARATUS TO ACHIEVE PRE-CODING BASED ON A DEMODULATION, DMRS, MULTIPLEXATION REFERENCE SYMBOL, COMPRISING A MAPPING MODULE AND A PRE-CODING MODULE, where the mapping module is configured to: determine a multiplexing ratio between DMRS ports and mapping data transport layers, respectively, to various DMRS ports with the determined multiplexing ratio; and the precoding module is configured to: precode pilot sequences corresponding to various DMRS ports according to a relationship between the data transport layers and the DMRS ports, characterized in that the mapping module is configured to : when mapping data transport layers, respectively, to DMRS ports with the given multiplexing ratio, a fixed relationship is defined between the data transport layer and the DMRS port,
    [0008]
    8. APPARATUS as claimed according to claim 7, characterized in that the mapping module is configured to map the data transport layers, respectively, to several DMRS ports with the multiplexing ratio determined according to any one or one combination of two of the following conditions: uniformly map all data transport layers to DMRS ports from two classified DMRS port groups; mapping all layers of the DMRS ports to two groups of DMRS ports classified according to a relationship between each codeword stream and the data transport layer; wherein mapping all layers of the DMRS ports of two groups of DMRS ports classified according to the relationship between each codeword stream and the data transport layer comprises: mapping layers of the same codeword stream to the ports of DMRS from the same priority DMRS port group, and mapping layers of different codeword streams to DMRS ports of different DMRS port groups respectively; or mapping layers of the same codeword stream to DMRS ports of different priority DMRS port groups, and mapping layers of different codeword streams to DMRS ports of the same DMRS port group.
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    法律状态:
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    2020-07-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-07-28| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-06-08| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-07-13| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-08-17| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 17/12/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
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