WO2016165625A1 - 解调参考信号端口的指示方法、装置及基站 - Google Patents

解调参考信号端口的指示方法、装置及基站 Download PDF

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Publication number
WO2016165625A1
WO2016165625A1 PCT/CN2016/079248 CN2016079248W WO2016165625A1 WO 2016165625 A1 WO2016165625 A1 WO 2016165625A1 CN 2016079248 W CN2016079248 W CN 2016079248W WO 2016165625 A1 WO2016165625 A1 WO 2016165625A1
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Prior art keywords
dmrs port
state
indication table
layer
sub
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PCT/CN2016/079248
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English (en)
French (fr)
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金婧
童辉
王启星
王飞
沈晓冬
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中国移动通信集团公司
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Priority to EP16779600.2A priority Critical patent/EP3273739A4/en
Publication of WO2016165625A1 publication Critical patent/WO2016165625A1/zh
Priority to US15/784,980 priority patent/US10419180B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0026—Division using four or more dimensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks

Definitions

  • the present disclosure relates to the field of wireless communications, and in particular, to a method, an apparatus, and a base station for indicating a De Modulation Reference Signal (DMRS) port.
  • DMRS De Modulation Reference Signal
  • Communication systems in the related art such as LTE (Long Term Evolution), WiMax (Worldwide Interoperability for Microwave Access), and 802.11n, use conventional 2D MIMO (Multiple-IZPut Multiple- Output, multi-input and multi-output technology, the basic principle is to improve transmission quality and system capacity through two-dimensional spatial freedom on the horizontal surface.
  • 2D MIMO Multiple-IZPut Multiple- Output, multi-input and multi-output technology
  • the basic principle is to improve transmission quality and system capacity through two-dimensional spatial freedom on the horizontal surface.
  • FIG. 1 it is a schematic diagram of a 3D MIMO antenna.
  • the 3D MIMO antenna expands the original N antennas into an N ⁇ M-dimensional antenna in the form of a matrix, wherein there are N days in the horizontal direction.
  • the line has M antennas in the vertical direction, and each of the original horizontal antennas is composed of M (i.e. 8-10) vertical antenna frames.
  • the present disclosure provides a method, an apparatus, and a base station for indicating a DMRS port of a demodulation reference signal, which solves the problem that the bit overhead of the DMRS port indication information in the maximum support layer 8 transmission is large.
  • a method for indicating a demodulation reference signal DMRS port including:
  • the UE is assigned a designated DMRS port; wherein, in the DMRS port indication table, the physical downlink shared channel PDSCH has a punched position and a punched position, and the downlink transmission layer of the UE and the corresponding All combinations between DMRS ports;
  • the DMRS port indication information includes 4 bits, where 4 bits include 1 indicating whether the physical downlink shared channel PDSCH of the UE in the DMRS port indication table exists.
  • the first control bit of the hole location, and the remaining three indicate the number of UE downlink transmission layers in the DMRS port indication table and the second control bit of the corresponding DMRS port.
  • the DMRS port indication information includes the following indication states:
  • the first control bit indicates a first state in which the UE physical downlink shared channel PDSCH does not have a punched position in the DMRS port indication table
  • the first control bit indicates a second state in which the UE physical downlink shared channel PDSCH does not have a puncturing position in the DMRS port indication table;
  • the first control bit indicates a third state in which the UE physical downlink shared channel PDSCH has a punching position in the DMRS port indication table;
  • the first control bit indicates a fourth state in which the UE physical downlink shared channel PDSCH has a puncturing position in the DMRS port indication table.
  • the first state includes: the second control bit indicates a first sub-state of the combination information between the UE single-layer transmission and each DMRS port in the DMRS port indication table, and the second control bit indicates that the UE is in the DMRS port indication table a second sub-state of the combination information between the number of layers and each DMRS port, and a second control bit indicating a third sub-state in which the reserved location is set in the DMRS port indication table;
  • the second state includes: the second control bit indicates a fourth sub-state of the combination information between the UE 2 to 4 layer transmission and each DMRS port in the DMRS port indication table, and the second control bit indicates the single UE 5-8 in the DMRS port indication table a fifth sub-state in which the layer transmits the combined information with each DMRS port;
  • the third state includes: the second control bit indicates a sixth sub-state of the combined information between the UE single layer transmission and each DMRS port in the DMRS port indication table;
  • the fourth state includes: the second control bit indicates a seventh sub-state of the combination information between the UE layer 2 to layer 4 transmission and each DMRS port in the DMRS port indication table;
  • the first sub-state and the fourth sub-state all indicate that the total number of downlink transmission layers is less than or equal to 4.
  • the fifth substate, the sixth substate, and the seventh substate indicate that the total number of downlink transmissions is greater than or equal to five.
  • the step of allocating the designated DMRS port to the UE includes:
  • the UE When the UE supports only a single layer transmission, and the total number of downlink transmission layers is less than or equal to 4, the UE is allocated a DMRS port indicating a combination condition in the first sub-state according to the DMRS port indication table;
  • the UE When the UE needs to retransmit, according to the DMRS port indication table, the UE is allocated a DMRS port indicating that one of the second sub-states is combined;
  • the UE When the UE supports the layer 2 to layer 4 transmission, and the current total number of downlink transmission layers is less than or equal to 4, according to the DMRS port indication table, the UE is allocated a DMRS port indicating a combination of the fourth substates;
  • the UE When only one UE transmits, the UE supports Layer 5-8 transmission, and the total downlink transmission total layer number is greater than or equal to 5. According to the DMRS port indication table, the UE is assigned a combination indicating that the fifth substate is in the fifth substate. DMRS port;
  • the UE When the UE supports only a single layer transmission, and the current total number of downlink transmission layers is greater than or equal to 5, according to the DMRS port indication table, the UE is allocated a DMRS port indicating a combination condition in the sixth sub-state;
  • a port indication table configured to allocate, to the UE, a DMRS port indicating that one of the seventh sub-states is combined;
  • the DMRS port indication information indicating the third sub-state is sent to the UE according to the DMRS port indication table.
  • the PDSCH does not have a puncturing position, where the current UE downlink transmission layer is less than or equal to 4, and the total downlink transmission layer is less than or equal to 4; or the current UE downlink transmission layer is greater than 4;
  • the presence of the punctured position of the PDSCH indicates that the number of downlink transmission layers of the current UE is greater than or equal to 4, and the total number of downlink transmission layers is greater than 4.
  • the step of allocating the designated DMRS port to the UE includes:
  • Each UE is allocated a corresponding DMRS port according to the order of the UEs in the first sorting sequence and the DMRS port indication table.
  • the step of allocating the designated DMRS port to the UE includes:
  • Each UE is allocated a corresponding DMRS port according to the order of the UEs in the second sorting sequence and the DMRS port indication table.
  • a pointing device for demodulating a reference signal DMRS port including:
  • the allocation module is configured to allocate a specified DMRS port to the UE according to the DMRS port indication table, where the downlink transmission of the UE is performed when the physical downlink shared channel PDSCH has a punched position and a punched position is recorded in the DMRS port indication table.
  • a sending module configured to send a DMRS to the UE according to the information of the DMRS port allocated for the UE Port indication information;
  • the DMRS port indication information includes 4 bits, wherein 4 bits include 1 first control bit indicating whether the UE physical downlink shared channel PDSCH in the DMRS port indication table has a puncturing position, and the remaining 3 indication DMRSs
  • the port indicates the number of downlink transmission layers of the UE and the second control bit of the corresponding DMRS port.
  • the DMRS port indication information includes the following indication states:
  • the first control bit indicates a first state in which the UE physical downlink shared channel PDSCH does not have a punched position in the DMRS port indication table
  • the first control bit indicates a second state in which the UE physical downlink shared channel PDSCH does not have a puncturing position in the DMRS port indication table;
  • the first control bit indicates a third state in which the UE physical downlink shared channel PDSCH has a punching position in the DMRS port indication table;
  • the first control bit indicates a fourth state in which the UE physical downlink shared channel PDSCH has a puncturing position in the DMRS port indication table.
  • the first state includes: the second control bit indicates a first sub-state of the combination information between the UE single-layer transmission and each DMRS port in the DMRS port indication table, and the second control bit indicates that the UE is in the DMRS port indication table a second sub-state of the combination information between the number of layers and each DMRS port, and a second control bit indicating a third sub-state in which the reserved location is set in the DMRS port indication table;
  • the second state includes: the second control bit indicates a fourth sub-state of the combination information between the UE 2 to 4 layer transmission and each DMRS port in the DMRS port indication table, and the second control bit indicates the single UE 5-8 in the DMRS port indication table a fifth sub-state in which the layer transmits the combined information with each DMRS port;
  • the third state includes: the second control bit indicates a sixth sub-state of the combined information between the UE single layer transmission and each DMRS port in the DMRS port indication table;
  • the fourth state includes: the second control bit indicates a seventh sub-state of the combination information between the UE layer 2 to layer 4 transmission and each DMRS port in the DMRS port indication table;
  • the first sub-state and the fourth sub-state all indicate that the total number of downlink transmission layers is less than or equal to 4.
  • the fifth substate, the sixth substate, and the seventh substate indicate that the total number of downlink transmissions is greater than or equal to five.
  • the allocation module includes:
  • a first allocation unit configured to: when the UE supports only a single layer transmission, and the current downlink total number of layers is less than or equal to 4, allocate, according to the DMRS port indication table, an indication that the UE is a combination of the first substate DMRS port;
  • a second allocation unit configured to: when the UE needs to retransmit, allocate, according to the DMRS port indication table, a DMRS port indicating that the UE is a combination of the second sub-state;
  • a third allocation unit configured to allocate, by the UE, a combination of the fourth sub-state according to the DMRS port indication table, when the UE supports the layer 2 to layer 4 transmission, and the current downlink transmission total layer number is less than or equal to 4.
  • a fourth allocation unit configured to: when only one UE transmits, the UE supports the 5-8 layer transmission, and the total downlink transmission total layer number is greater than or equal to 5.
  • the UE is assigned an indication as the fifth sub- a combination of DMRS ports in the state;
  • a fifth allocation unit configured to allocate, according to the DMRS port indication table, a combination of the indication in the sixth sub-state according to the DMRS port indication table, when the UE only supports the single-layer transmission, and the total downlink transmission total layer number is greater than or equal to 5.
  • a sixth allocation unit configured to allocate, according to the DMRS port indication table, a combination of the indication into the seventh sub-state according to the DMRS port indication table, when the UE supports the layer 2 to layer 4 transmission, and the current downlink transmission total layer number is less than or equal to 5.
  • a seventh allocation unit configured to send, to the UE, a DMRS port indication information indicating a third sub-state according to the DMRS port indication table when a specific DMRS port needs to be allocated to the UE.
  • the allocation module includes:
  • a first sorting unit configured to perform a descending ordering of the UE to obtain a first sorting sequence according to a maximum downlink transmission layer currently supported by the UE;
  • the eighth allocating unit is configured to allocate a corresponding DMRS port to each UE according to the order of the UEs in the first sorting sequence and the DMRS port indication table.
  • the allocation module further includes:
  • a second sorting unit configured to perform an ascending sorting of the UE to obtain a second sorting sequence according to a maximum downlink transmission layer currently supported by the UE;
  • the ninth allocation unit is configured to allocate a corresponding DMRS port to each UE according to the order of the UEs in the second sorting sequence and the DMRS port indication table.
  • a base station comprising the indication means of the demodulation reference signal DMRS port as above.
  • a method, an apparatus, and a base station for indicating a DMRS port of a demodulation reference signal the DMRS port indication table provided covers all cases of supporting maximum 8-layer transmission, and 4 bits defined by DMRS port indication information are available.
  • the single codeword transmission and the dual codeword transmission in combination with the relevant standard indicate all the cases in the DMRS port indication table, which can save the bit overhead of the DMRS port indication information.
  • FIG. 1 is a schematic diagram showing a 3D MIMO antenna in the related art
  • Figure 2 shows the occupancy of DMRS resources when supporting Layer 4 transmission in the relevant standards
  • Figure 3 shows the occupancy of DMRS resources when supporting maximum 8-layer transmission in the relevant standards
  • FIG. 4 is a flow chart showing a method for indicating a demodulation reference signal DMRS port of the present disclosure
  • FIG. 5 is a block diagram showing the pointing device of the DMRS port of the demodulation reference signal of the present disclosure.
  • 3D MIMO can distinguish more pairs of users.
  • the DMRS of MU MIMO in the relevant standard supports up to 4 layers, which cannot meet the requirements of 3D MIMO technology.
  • Table 1 is the DMRS support for MU MIMO to support Layer 4 transmission in the related art
  • Figure 2 is the DMRS resource for supporting Layer 4 transmission in the related standard. Occupation.
  • the two orthogonal DMRS ports Port7 and Port8 are used, and an OCC (orthogonal cover code) of length 2 and two quasi-orthogonal scrambling codes quasi-orthogonal Scrambling ID are used.
  • 0, 1 provides a total of 4 layers of transmission (layer 1-4).
  • scheme 2 In the presence of 2 users (UE1 and UE2), each user double-layer transmission, scheme 2 can be adopted: UE1 uses Port7 and Port8, and uses Scrambling ID 0; UE1 uses Port7 and Port8, and uses Scrambling ID 1.
  • each user can transmit a single layer.
  • Scheme 3 UE1 uses Port7 and uses Scrambling ID 0; UE2 uses Port7 and uses Scrambling ID 1; UE3 uses Port8, and use Scrambling ID 0; UE4 uses Port8 and uses Scrambling ID 1.
  • Table 2 shows a DMRS situation when MU MIMO supports maximum 8-layer transmission
  • Figure 3 shows the occupancy of DMRS resources when supporting the maximum 8-layer transmission.
  • Port 7 to Port 10 occupy the first 12 RE
  • Port 11 to Port 14 occupy 12 RE.
  • an OCC of length 2 is used, occupying 24 RE.
  • the new UE uses a length of 4 OCC when it supports Layer 3 transmission, occupying 12 RE.
  • MU-MIMO may occupy a total of 24 REs, and a single user only occupies 12 REs, the user needs to perform rate matching for the other 12 REs, that is, for current use.
  • the user, the other 12RE location does not send any data, and the UE knows that the location is empty when receiving data.
  • the direct solution is to list all the cases in which MU/SU supports up to 8 layers of transmission. Then 4 bits are needed to indicate that the current user uses the i-th layer, and 1 bit is required to indicate whether the total number of layers is >4 layers. As shown in Table 3, it is the DMRS port indication table under the direct solution.
  • the user needs to play another 12 RE.
  • the hole performs rate matching, that is, for the current user, the other 12RE location does not transmit any data, and the UE knows that the location is empty when receiving data.
  • the DMRS port indication information may be included in the DCI message, and a total of several layers (whether or not > 4 layers) of information needs to be added while indicating that the user is the first layer.
  • the direct solution in the related art is to support the SU/MU to support all case lists of 8 layers as the DMRS port indication table, as shown in Table 3, in the case of single code word transmission or double code word transmission, both are defined. 16 kinds of value indications, then 4 bits need to be reserved in the DCI message to indicate that the current user uses the ij port, and an additional 1 bit is needed to indicate whether the current total downlink transmission layer is greater than 4 layers.
  • some embodiments of the present disclosure provide a method for indicating a demodulation reference signal DMRS port, as shown in FIG. 4, specifically including the following steps 10 and 20.
  • Step 10 Allocate a designated DMRS port to the UE according to the DMRS port indication table.
  • the DMRS port indication table records that the physical downlink shared channel PDSCH has a punching position and In the case where there is no puncturing position, all combinations between the number of downlink transmission layers of the UE and the corresponding DMRS port.
  • the DMRS port indication table is different from that in the related art. For details, refer to Table 4. It is worth noting that the correspondence between the number of downlink transmission layers of the UE and the corresponding DMRS port in Table 4 is based on the table. The port definition in 2 is determined. When the definition in Table 2 changes, Table 4 will also change correspondingly.
  • the DMRS port indication table covers all cases in the above direct scheme, but the DMRS port indication The table classifies the combination of the downlink transmission layer number and the DMRS port according to whether the physical downlink shared channel (PDSCH, Physical Downlink Shared Channel) is punctured, single codeword transmission, or dual codeword transmission, and does not play on the PDSCH. Eight different value values are defined in the case of hole and single codeword transmission, PDSCH non-puncturing and double codeword transmission, PDSCH puncturing and single codeword transmission, and PDSCH puncturing and double codeword transmission.
  • PDSCH Physical Downlink shared channel
  • Step 20 Send a DMRS port indication information to the UE according to the information of the DMRS port allocated for the UE.
  • the DMRS port indication information is included in the DCI message, and the DMRS port indication information includes 4 bits, wherein the 4 bits include 1 first control bit indicating whether the UE physical downlink shared channel PDSCH in the DMRS port indication table has a puncturing position. And the remaining 3 indicating the number of UE downlink transmission layers in the DMRS port indication table and the second control bit of the corresponding DMRS port.
  • the first control bit (0 or 1), and the third control bit indicating the number of downlink transmission layers of the UE and the corresponding DMRS port in the DMRS port indication table may be reserved, and 4 bit+ is reserved in the DCI message in the direct scheme.
  • the 1 bit mode saves 1 bit, which makes it very meaningful for the channel overhead of DCI messages.
  • the DMRS port indication information includes four indication states, and the first control bit indicating that the PDSCH does not have a puncturing position when the value of the first control bit is 0, and the value of the first control bit indicates that the PDSCH has a puncturing position.
  • the first control bit of the PDSCH wherein the PDSCH does not have a puncturing location, where the number of downlink transmission layers of the current user is less than or equal to 4, and the total number of downlink transmission layers is less than or equal to 4; or the number of downlink transmission layers of the current user is greater than 4, and the PDSCH exists.
  • the punching position means that the current user has a small number of downlink transmission layers. It is equal to or equal to 4, and the total number of downlink transmission layers is greater than 4.
  • the four indication states are:
  • a first state when a single codeword is transmitted, and the value of the first control bit is 0;
  • the fourth state is when the double codeword is transmitted, and the value of the first control bit is 1.
  • the three second control bits may indicate all the cases listed in the DMRS port indication table in combination with the first control bit. It is worth noting that the value definition of the second control bit listed below is only an example and does not represent a unique value definition of the DMRS indication information.
  • the first control bit has a value of 0 in the first state, and the first state includes:
  • the second control bit indicates a first sub-state of the combined information between the UE single layer transmission and each DMRS port in the DMRS port indication table, where the DMRS port indication table provides four different DMRS ports for the UE single layer transmission ( As shown in port 4, port 7, port 8, port 9, port 10), the values of the second control bit can be correspondingly defined as 000, 001, 010, and 011 for indicating the above four different ports.
  • the second control bit indicates a second sub-state of the combination information between the downlink retransmission layer of the UE and the DMRS port in the DMRS port indication table, where, as shown in Table 4, the DMRS port indication table provides for UE retransmission.
  • Table 4 the DMRS port indication table provides for UE retransmission.
  • the second control bit indicates a third substate of the reserved location in the DMRS port indication table, defined The value of the second control bit is 111.
  • the value of the first control bit is 0, and the second state includes:
  • the second control bit indicates a fourth sub-state of the combination information between the UE layer 2 to layer 4 transmission and each DMRS port in the DMRS port indication table, and the DMRS port indication table provides two different ports for the UE double layer transmission, such as As shown in Table 4, port 7-8 and port 7-9 respectively correspond to the value of the second control bit, which can be defined as 000 and 001.
  • the DMRS port indication table provides port 7-9 and port 7 for UE Layer 3 transmission and Layer 4 transmission respectively. -10, the values of the corresponding second control bits may be defined as 010 and 011;
  • the second control bit indicates a fifth sub-state of the combination information between the single UE 5-8 layer transmission and each DMRS port in the DMRS port indication table, where the DMRS port indication table provides port7-11 for the single UE 5-8 layer transmission respectively.
  • Port7-112, port7-13, and port 7-14, the values of the corresponding second control bits may be defined as 100, 101, 110, and 111.
  • the value of the first control bit is 1 in the third state, and the third state includes: the second control bit indicates a sixth sub-state of the combination information between the UE single layer transmission and each DMRS port in the DMRS port indication table, where The DMRS port indication table provides eight different DMRS ports for the UE single layer transmission, one-to-one corresponding to the port 7-port 14, and the corresponding second control bit has a value of 000 to 111.
  • the fourth state includes: the second control bit indicates a seventh sub-state of the combination information between the UE layer 2 to layer 4 transmission and each DMRS port in the DMRS port indication table, where the DMRS port indication table provides four types of user double layer transmission.
  • Different DMRS port combinations are port 7-8, port 9-10, port 11-12, and port 13-14, and the corresponding second control bits have values of 000, 001, 010, and 011.
  • the DMRS port indication table is user layer three. And four layers of transmission provide two different DMRS port combinations, respectively In other words, port 7-9, port 11-13, and port 7-10, port 11-14, the corresponding second control bits have values of 100, 101, 110, and 111.
  • the first sub-state and the fourth sub-state all indicate that the total number of downlink transmission layers is less than or equal to 4; the fifth sub-state, the sixth sub-state, and the seventh sub-state indicate that the total number of downlink transmission layers is greater than or equal to 5. It is worth noting that the definition of the part is consistent with the definition of whether the PDSCH has a punch location, that is, the first control information may indirectly reflect the current total number of downlink transmission layers.
  • the step of allocating the designated DMRS port to the UE includes:
  • the UE When the UE supports only a single layer transmission, and the current total downlink transmission layer number is less than or equal to 4, according to the DMRS port indication table, the UE is allocated a DMRS port indicating that the combination is one of the first sub-states, because the single The layer transmission uses a single codeword transmission method.
  • the value of the first control bit in the DMRS port indication information is 0, and the value of the second control bit is any one of 000-100;
  • the UE When the UE needs to retransmit, according to the DMRS port indication table, the UE is allocated a DMRS port indicating that the combination is one of the second sub-states, because the retransmission is caused by the data transmission failure, so it becomes a single Code word transmission.
  • the value of the first control bit in the DMRS port indication information is 0, and the value of the second control bit is one of 101-110.
  • the port indication table allocates a DMRS port in the case that the UE is indicated as one of the fourth sub-states, and uses a dual-codeword transmission mode when transmitting in a multi-layer manner.
  • the value of the first control bit in the DMRS port indication information is 0, and the value of the second control bit is any one of 000-100.
  • the UE When there is only one UE, the UE supports Layer 5-8 transmission, and the total number of downlink transmissions is greater than or equal to 5.
  • the UE is assigned a combination of indications in the fifth substate.
  • the DMRS port for example, a single UE layer 5 transmission corresponds to port 7-11.
  • the value of the first control bit in the DMRS port indication information is 0, and the value of the second control bit is one of the corresponding 101-111.
  • the UE When the UE only supports single-layer transmission, single codeword transmission, and the total number of downlink transmission layers is greater than or equal to 5, according to the DMRS port indication table, the UE is allocated a DMRS port indicating a combination condition in the sixth sub-state. Instructions. In this case, the value of the first control bit in the DMRS port indication information is 1 and the value of the second control bit is any one of 000-111.
  • the UE When the UE supports the layer 2 transmission, the dual codeword transmission, and the current total downlink transmission layer number is less than or equal to 5, according to the DMRS port indication table, the UE is allocated a DMRS indicating a combination condition in the seventh substate.
  • the port indicates information, for example, when the UE is a Layer 3 transmission, the port 7-9 or port 1-13 is allocated to the UE.
  • the value of the first control bit in the DMRS port indication information is 1, and the value of the second control bit may be correspondingly selected as one of 000-111 according to the number of transmission layers.
  • the DMRS port indication information indicating the third sub-state is sent to the UE, that is, the value of the first control bit is 0, and the value of the second control bit is 111.
  • the DMRS port indication table (Table 4) provided in the embodiment of the present disclosure covers all cases that support the maximum 8-layer transmission, and the 4-bit defined by the DMRS port indication information can be combined with the single-word transmission and double code of the relevant standard.
  • the word transmission condition indicates all the cases in the DMRS port indication table.
  • some 4 bits in the DCI message can be used as the DMRS port indication information, thus saving the bit overhead of the DCI message.
  • the step of allocating the designated DMRS port to the UE according to the DMRS port indication table includes: performing the descending ordering of the UE according to the maximum downlink transmission layer currently supported by the UE. a sorting sequence; respectively, assigning corresponding DMRS ports to the respective UEs according to the order of the UEs in the first sorting sequence and the DMRS port indication table. For example, when there are three users A, B, and C, the maximum number of support layers per user is 3, 2, and 1, respectively, and the priority order of the three users is A, B, and C, and then the DMRS port is allocated. Priority will be assigned to A, such as port 7-9, and then B will be assigned a DMRS port port 11-12 that will not interfere with A, and finally a port 10 will be assigned to C.
  • a device for demodulating a reference signal DMRS port including:
  • An allocating module configured to allocate a designated DMRS port to the UE according to the DMRS port indication table;
  • the DMRS port indication table records the total combination between the number of downlink transmission layers of the UE and the corresponding DMRS port in the case where the physical downlink shared channel PDSCH has a punched position and a punched position.
  • a sending module configured to send, according to the information about the DMRS port allocated for the UE, a DMRS port indication information to the UE;
  • the DMRS port indication information includes 4 bits, where 4 bits include 1 indicator, the physical downlink sharing of the UE in the DMRS port indication table Whether the channel PDSCH has the first control bit of the puncturing position, and the remaining three indicating the number of the UE downlink transmission layer in the DMRS port indication table and the second control bit of the corresponding DMRS port.
  • the DMRS port indication information includes the following indication states:
  • the first control bit indicates a first state in which the UE physical downlink shared channel PDSCH does not have a punched position in the DMRS port indication table
  • the first control bit indicates a second state in which the UE physical downlink shared channel PDSCH does not have a puncturing position in the DMRS port indication table;
  • the first control bit indicates a third state in which the UE physical downlink shared channel PDSCH has a punching position in the DMRS port indication table;
  • the first control bit indicates a fourth state in which the UE physical downlink shared channel PDSCH has a puncturing position in the DMRS port indication table.
  • the first state includes: the second control bit indicates a first sub-state of the combination information between the UE single layer transmission and each DMRS port in the DMRS port indication table, and the second control bit indicates the UE downlink retransmission layer in the DMRS port indication table. a second sub-state of the combined information between the number and each DMRS port, and a second The control bit indicates a third sub-state in which the reserved location is set in the DMRS port indication table;
  • the second state includes: the second control bit indicates a fourth sub-state of the combination information between the UE 2 to 4 layer transmission and each DMRS port in the DMRS port indication table, and the second control bit indicates the single UE 5-8 in the DMRS port indication table a fifth sub-state in which the layer transmits the combined information with each DMRS port;
  • the third state includes: the second control bit indicates a sixth sub-state of the combined information between the UE single layer transmission and each DMRS port in the DMRS port indication table;
  • the fourth state includes: the second control bit indicates a seventh sub-state of the combination information between the UE layer 2 to layer 4 transmission and each DMRS port in the DMRS port indication table;
  • the first sub-state and the fourth sub-state all indicate that the total number of downlink transmission layers is less than or equal to 4.
  • the fifth substate, the sixth substate, and the seventh substate indicate that the total number of downlink transmissions is greater than or equal to five.
  • the distribution module includes:
  • a first allocation unit configured to: when the UE supports only a single layer transmission, and the current downlink total number of layers is less than or equal to 4, allocate, according to the DMRS port indication table, an indication that the UE is a combination of the first substate DMRS port;
  • a second allocation unit configured to: when the UE needs to retransmit, allocate, according to the DMRS port indication table, a DMRS port indicating that the UE is a combination of the second sub-state;
  • a third allocation unit configured to allocate, by the UE, a combination of the fourth sub-state according to the DMRS port indication table, when the UE supports the layer 2 to layer 4 transmission, and the current downlink transmission total layer number is less than or equal to 4.
  • a fourth allocation unit configured to support 5-8 layer transmission when only one UE transmits, and currently The total number of downlink transmission layers is greater than or equal to 5.
  • the UE is allocated a DMRS port indicating that one of the fifth sub-states is combined;
  • a fifth allocation unit configured to allocate, according to the DMRS port indication table, a combination of the indication in the sixth sub-state according to the DMRS port indication table, when the UE only supports the single-layer transmission, and the total downlink transmission total layer number is greater than or equal to 5.
  • a sixth allocation unit configured to allocate, according to the DMRS port indication table, a combination of the indication into the seventh sub-state according to the DMRS port indication table, when the UE supports the layer 2 to layer 4 transmission, and the current downlink transmission total layer number is less than or equal to 5.
  • a seventh allocation unit configured to send, to the UE, a DMRS port indication information indicating a third sub-state according to the DMRS port indication table when a specific DMRS port needs to be allocated to the UE.
  • the distribution module includes:
  • a first sorting unit configured to perform a descending ordering of the UE to obtain a first sorting sequence according to a maximum downlink transmission layer currently supported by the UE;
  • the eighth allocating unit is configured to allocate a corresponding DMRS port to each UE according to the order of the UEs in the first sorting sequence and the DMRS port indication table.
  • the distribution module further includes:
  • a second sorting unit configured to perform an ascending sorting of the UE to obtain a second sorting sequence according to a maximum downlink transmission layer currently supported by the UE;
  • the ninth allocation unit is configured to allocate a corresponding DMRS port to each UE according to the order of the UEs in the second sorting sequence and the DMRS port indication table.
  • the device is a device corresponding to the indication method of the DMRS port, and all the implementation manners in the foregoing method embodiments are applicable to the embodiment of the device, and the same technical effects can be achieved.
  • a base station comprising the indication means of the DMRS port as described above.
  • embodiments of the present disclosure can be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

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Abstract

本公开揭露了一种解调参考信号(De Modulation Reference Signal，DMRS)端口的指示方法、装置及基站，提供的DMRS端口指示表涵盖了最大支持8层传输的全部case，通过DMRS端口指示信息定义的4比特可结合相关标准的单码字传输和双码字传输情况将该DMRS端口指示表中的全部case指示，可节省DMRS端口指示信息的比特开销。

Description

解调参考信号端口的指示方法、装置及基站
相关申请的交叉引用
本申请主张在2015年4月14日在中国提交的中国专利申请号No.201510173761.1的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及无线通信领域，尤其涉及一种解调参考信号(De Modulation Reference Signal，DMRS)端口的指示方法、装置及基站。
背景技术
相关技术中的通信系统，如LTE(Long Term Evolution，长期演进)、WiMax(Worldwide Interoperability for Microwave Access，全球微波互联接入)、802.11n，采用的都是传统的2D MIMO(Multiple-IZPut Multiple-Output，多输入多输出)技术，其基本原理是通过水平面上的二维空间自由度来改善传输质量、提高系统容量。随着天线设计架构的发展，为了改善移动通信系统传输效率及提高用户体验，需要充分挖掘垂直空间自由度，把传统的2D MIMO技术扩展到3D MIMO技术，充分利用三维空间的自由度来提高系统性能。
如图1所示，为3D MIMO天线的示意图。由图中可以看出，3D MIMO天线将原来的N根天线扩展为矩阵形式的N×M维天线，其中，水平方向有N根天 线，垂直方向有M根天线，原来的每根水平天线由M个(i.e.8-10个)垂直方向的天线阵子组成。
发明内容
本公开提供了一种解调参考信号DMRS端口的指示方法、装置及基站，解决了最大支持8层传输中DMRS端口指示信息比特开销大的问题。
依据本公开的一个方面，提供了一种解调参考信号DMRS端口的指示方法，包括：
根据DMRS端口指示表，为UE分配指定的DMRS端口；其中，DMRS端口指示表中记录有物理下行共享信道PDSCH存在打孔位置和不存在打孔位置的情况下，UE下行传输层数和对应的DMRS端口之间的全部组合情况；
根据为UE分配的DMRS端口的信息，向UE发送一DMRS端口指示信息；DMRS端口指示信息中包括4比特，其中，4比特包括1个指示DMRS端口指示表中UE物理下行共享信道PDSCH是否存在打孔位置的第一控制比特，以及剩余的3个指示DMRS端口指示表中UE下行传输层数和对应的DMRS端口的第二控制比特。
可选的，DMRS端口指示信息包括以下指示状态：
在单码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH不存在打孔位置的第一状态；
在双码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH不存在打孔位置的第二状态；
在单码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH存在打孔位置的第三状态；以及
在双码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH存在打孔位置的第四状态。
可选的，第一状态包括：第二控制比特指示DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息第一子状态，第二控制比特指示DMRS端口指示表中UE下行重传层数与各DMRS端口之间的组合信息的第二子状态，以及第二控制比特指示DMRS端口指示表中设置预留位置的第三子状态；
第二状态包括：第二控制比特指示DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第四子状态，以及第二控制比特指示DMRS端口指示表中单UE5～8层传输与各DMRS端口之间的组合信息的第五子状态；
第三状态包括：第二控制比特指示DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息的第六子状态；
第四状态包括：第二控制比特指示DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第七子状态；
其中，第一子状态和第四子状态均指示下行传输总层数小于或等于4；
第五子状态、第六子状态和第七子状态指示下行传输总层数大于或等于5。
可选的，根据DMRS端口指示表，为UE分配指定的DMRS端口的步骤包括：
当UE仅支持单层传输，且当前下行传输总层数小于或等于4时，根据DMRS端口指示表，为UE分配一指示为第一子状态中的一种组合情况的DMRS端口；
当UE需要重传时，根据DMRS端口指示表，为UE分配一指示为第二子状态中的一种组合情况的DMRS端口；
当UE支持2～4层传输，且当前下行传输总层数小于或等于4时，根据DMRS端口指示表，为UE分配一指示为第四子状态中的一种组合情况的DMRS端口；
当仅有一个UE传输时，UE支持5～8层传输，且当前下行传输总层数大于或等于5，根据DMRS端口指示表，为UE分配一指示为第五子状态中的一种组合情况的DMRS端口；
当UE仅支持单层传输，且当前下行传输总层数大于或等于5时，根据DMRS端口指示表，为UE分配一指示为第六子状态中的一种组合情况的DMRS端口；
当UE支持2～4层传输，且当前下行传输总层数小于或等于5时，根据DMRS 端口指示表，为UE分配一指示为第七子状态中的一种组合情况的DMRS端口；
当需要为UE分配特定的DMRS端口时，根据DMRS端口指示表，向UE发送一指示为第三子状态的DMRS端口指示信息。
可选的，PDSCH不存在打孔位置表示当前UE下行传输层数小于或等于4，且下行总传输层数小于或等于4；或者当前UE下行传输层数大于4；
PDSCH存在打孔位置表示当前UE下行传输层数大于或等于4，且下行总传输层数大于4。
可选的，当存在多个UE时，根据DMRS端口指示表，为UE分配指定的DMRS端口的步骤包括：
根据UE当前所支持的最大下行传输层数，对UE进行降序排序得到第一排序序列；
按照第一排序序列中UE的顺序和DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
可选的，当存在多个UE时，根据DMRS端口指示表，为UE分配指定的DMRS端口的步骤包括：
根据UE当前所支持的最大下行传输层数，对UE进行升序排序得到第二排序序列；
按照第二排序序列中UE的顺序和DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
依据本公开的再一个方面，还提供了一种解调参考信号DMRS端口的指示装置，包括：
分配模块，用于根据DMRS端口指示表，为UE分配指定的DMRS端口；其中，DMRS端口指示表中记录有物理下行共享信道PDSCH存在打孔位置和不存在打孔位置的情况下，UE下行传输层数和对应的DMRS端口之间的全部组合情况；
发送模块，用于根据为UE分配的DMRS端口的信息，向UE发送一DMRS 端口指示信息；DMRS端口指示信息中包括4比特，其中，4比特包括1个指示DMRS端口指示表中UE物理下行共享信道PDSCH是否存在打孔位置的第一控制比特，以及剩余的3个指示DMRS端口指示表中UE下行传输层数和对应的DMRS端口的第二控制比特。
可选的，DMRS端口指示信息包括以下指示状态：
在单码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH不存在打孔位置的第一状态；
在双码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH不存在打孔位置的第二状态；
在单码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH存在打孔位置的第三状态；以及
在双码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH存在打孔位置的第四状态。
可选的，第一状态包括：第二控制比特指示DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息第一子状态，第二控制比特指示DMRS端口指示表中UE下行重传层数与各DMRS端口之间的组合信息的第二子状态，以及第二控制比特指示DMRS端口指示表中设置预留位置的第三子状态；
第二状态包括：第二控制比特指示DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第四子状态，以及第二控制比特指示DMRS端口指示表中单UE5～8层传输与各DMRS端口之间的组合信息的第五子状态；
第三状态包括：第二控制比特指示DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息的第六子状态；
第四状态包括：第二控制比特指示DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第七子状态；
其中，第一子状态和第四子状态均指示下行传输总层数小于或等于4；
第五子状态、第六子状态和第七子状态指示下行传输总层数大于或等于5。
可选的，分配模块包括：
第一分配单元，用于当UE仅支持单层传输，且当前下行传输总层数小于或等于4时，根据DMRS端口指示表，为UE分配一指示为第一子状态中的一种组合情况的DMRS端口；
第二分配单元，用于当UE需要重传时，根据DMRS端口指示表，为UE分配一指示为第二子状态中的一种组合情况的DMRS端口；
第三分配单元，用于当UE支持2～4层传输，且当前下行传输总层数小于或等于4时，根据DMRS端口指示表，为UE分配一指示为第四子状态中的一种组合情况的DMRS端口；
第四分配单元，用于当仅有一个UE传输时，UE支持5～8层传输，且当前下行传输总层数大于或等于5，根据DMRS端口指示表，为UE分配一指示为第五子状态中的一种组合情况的DMRS端口；
第五分配单元，用于当UE仅支持单层传输，且当前下行传输总层数大于或等于5时，根据DMRS端口指示表，为UE分配一指示为第六子状态中的一种组合情况的DMRS端口；
第六分配单元，用于当UE支持2～4层传输，且当前下行传输总层数小于或等于5时，根据DMRS端口指示表，为UE分配一指示为第七子状态中的一种组合情况的DMRS端口；
第七分配单元，用于当需要为UE分配特定的DMRS端口时，根据DMRS端口指示表，向UE发送一指示为第三子状态的DMRS端口指示信息。
可选的，分配模块包括：
第一排序单元，用于根据UE当前所支持的最大下行传输层数，对UE进行降序排序得到第一排序序列；
第八分配单元，用于按照第一排序序列中UE的顺序和DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
可选的，分配模块还包括：
第二排序单元，用于根据UE当前所支持的最大下行传输层数，对UE进行升序排序得到第二排序序列；
第九分配单元，用于按照第二排序序列中UE的顺序和DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
依据本公开的再一个方面，还提供了一种基站，包括如上的解调参考信号DMRS端口的指示装置。
本公开的实施例中，一种解调参考信号DMRS端口的指示方法、装置及基站，提供的DMRS端口指示表涵盖了最大支持8层传输的全部case，通过DMRS端口指示信息定义的4比特可结合相关标准的单码字传输和双码字传输情况将该DMRS端口指示表中的全部case指示，可节省DMRS端口指示信息的比特开销。
附图说明
图1表示相关技术中的3D MIMO天线的示意图；
图2表示相关标准中支持4层传输时的DMRS资源的占用情况；
图3表示相关标准中支持最大8层传输时的DMRS资源的占用情况；
图4表示本公开的解调参考信号DMRS端口的指示方法的流程示意图；
图5表示本公开的解调参考信号DMRS端口的指示装置的模块示意图。
具体实施方式
相比传统的2D MIMO，3D MIMO可以区分出更多的配对用户。但相关标准中MU MIMO的DMRS最大支持4层，不能满足3D MIMO技术的需求。
在3GPP R12标准下，如表1和图2所示，其中，表1为相关技术中MU MIMO支持4层传输时的DMRS的支持情况，图2为相关标准中支持4层传输时的DMRS资源的占用情况。由表1中可以看出，通过2个正交的DMRS端口Port7和Port8，并利用长度为2的OCC(orthogonal cover code，正交掩码)和两个准正交扰码quasi-orthogonal Scrambling ID 0、1，提供总共4层传输(layer1-4)。
表1
Figure PCTCN2016079248-appb-000001
应用上述相关技术中的的DMRS，在存在2个用户(UE1和UE2)，每个用户单层传输时，可采用方案1：UE1使用Port7；UE2使用Port8。
在存在2个用户(UE1和UE2)，每个用户双层传输时，可采用方案2：UE1使用Port7和Port8，并使用Scrambling ID 0；UE1使用Port7和Port8，并使用Scrambling ID 1。
在存在4个用户(UE1、UE2、UE3和UE4)，每个用户单层传输时，可采用方案3：UE1使用Port7，并使用Scrambling ID 0；UE2使用Port7，并使用Scrambling ID 1；UE3使用Port8，并使用Scrambling ID 0；UE4使用Port8，并使用Scrambling ID 1。
由上可知，相关技术中的DMRS方案最大支持4层传输。
结合标准化进展，目前标准化讨论的DMRS pattern趋势之一为：新UE的DMRS使用总共24RE(Resource Element，资源元素)，利用长度为4的正交掩码OCC＝4提供8个正交的DMRS端口。
如表2和图3所示，表2为MU MIMO支持最大8层传输时的一种DMRS情况，图3为对应的支持最大8层传输时的DMRS资源的占用情况。其中，Port7～Port10占用前12RE，Port11～Port 14占用后12RE。与相关技术中单用户最大8层传输的设计不同：相关技术中单用户MIMO支持3层传输时，使用长度为2的OCC，占用24RE。新的UE在支持3层传输时，使用长度为4的OCC，占用12RE。
表2
Figure PCTCN2016079248-appb-000002
考虑到可能出现MU-MIMO总共占用24RE，而单用户仅占用12RE的情况，用户需要针对另外12RE的打孔做rate matching(速率匹配)，即对于当前用 户，另外12RE位置不发送任何数据，且UE在接收数据时知道该位置为空。
那么，DCI中指示用户为第几层传输的同时，需要附加总共几层传输(是否＞4层传输)的信息。直接的解决方案为将MU/SU最大支持8层传输的所有情况列表，那么需要4bit来指示当前用户使用第i-j层，另外还需要1bit指示总层数是否＞4层。如表3所示，为直接解决方案下的DMRS端口指示表。
表3
Figure PCTCN2016079248-appb-000003
下面将参照附图更详细地描述本公开的示例性实施例。虽然附图中显示了本公开的示例性实施例，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施例所限制。相反，提供这些实施例是为了能够更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。
在当前支持最大8层的DMRS技术方案中，考虑到可能出现多用户(MU，multiuser)总共占用24RE，而单用户(SU，Single user)仅占用12RE的情况，用户需要对另外的12RE的打孔做速率匹配，即对于当前用户，另外12RE位置不发送任何数据，且UE在接收数据时知道该位置为空。那么DMRS端口指示信息中，可包含于DCI消息中，需要在指示用户为第几层的同时，附加总共几层(是否＞4层)的信息。在相关技术中直接解决方案是将SU/MU最大支持8层的全部case列表，作为DMRS端口指示表，如表3所示，在单码字传输或双码字传输的情况下，均定义了16种value指示，那么在DCI消息中需要预留4bit来指示当前用户使用第i-j端口，另外还需要额外预留1bit来指示当前下行传输总层数是否大于4层。
这样在DCI消息中需要4bit+1bit来实现，这样对于相关标准中定义的3bit表格多出2bit，而DCI消息是每个下行子帧均需要发送的，这样对于信道的开销是非常巨大的，为了解决上述问题，本公开一些实施例提供了一种解调参考信号DMRS端口的指示方法，如图4所示，具体包括以下步骤10和20。
步骤10：根据DMRS端口指示表，为UE分配指定的DMRS端口。
这里，DMRS端口指示表中记录有物理下行共享信道PDSCH存在打孔位置和 不存在打孔位置的情况下，UE下行传输层数和对应的DMRS端口之间的全部组合情况。
其中，这里所说的DMRS端口指示表与相关技术中的不同，具体可参照表4所示，值得指出的是表4中UE下行传输层数和对应的DMRS端口之间的对应关系是根据表2中的端口定义确定的，当表2中的定义发生改变时，表4也会随之发生对应的改变，该DMRS端口指示表中涵盖了上述直接方案中的全部case，但该DMRS端口指示表是按照物理下行共享信道(PDSCH，Physical Downlink Shared Channel)是否打孔、单码字传输或双码字传输不同情况下，对下行传输层数与DMRS端口之间组合进行分类，在PDSCH不打孔且单码字传输、PDSCH不打孔且双码字传输、PDSCH打孔且单码字传输以及PDSCH打孔且双码字传输情况下，均定义了8种不同的value。
表4
Figure PCTCN2016079248-appb-000004
Figure PCTCN2016079248-appb-000005
步骤20：根据为UE分配的DMRS端口的信息，向UE发送一DMRS端口指示信息。
这里，DMRS端口指示信息包含在DCI消息中，DMRS端口指示信息中包括4比特，其中，4比特包括1个指示DMRS端口指示表中UE物理下行共享信道PDSCH是否存在打孔位置的第一控制比特，以及剩余的3个指示DMRS端口指示表中UE下行传输层数和对应的DMRS端口的第二控制比特。
由于相关技术的标准中已有指示单码字传输或双码字传输的指示消息，因此只需在DCI消息中定义1个指示DMRS端口指示表中UE物理下行共享信道PDSCH是否存在打孔位置的第一控制比特(0或1)，以及3个指示DMRS端口指示表中UE下行传输层数和对应的DMRS端口的第二控制比特即可，对比于直接方案中在DCI消息中预留4bit+1bit的方式，节省了1bit，这样对于DCI消息的信道开销是非常有意义的。
其中，DMRS端口指示信息包括4种指示状态，假定第一控制比特的值为0时指示PDSCH不存在打孔位置的第一控制比特，第一控制比特的值为1时指示PDSCH存在打孔位置的第一控制比特；其中，PDSCH不存在打孔位置是指当前用户下行传输层数小于或等于4，且下行总传输层数小于或等于4；或者当前用户下行传输层数大于4，PDSCH存在打孔位置是指当前用户下行传输层数小 于或等于4，且下行总传输层数大于4。四种指示状态分别是：
第一状态：在单码字传输时，且第一控制比特的值为0；
第二状态，在双码字传输时，且第一控制比特的值为0；
第三状态，在单码字传输时，且第一控制比特的值为1；
第四状态，在双码字传输时，且第一控制比特的值为1。
其中，以上4种状态下均存在8种不同的UE下行传输层数和对应的DMRS端口组合的方式，即8种value。3个第二控制比特可结合上述第一控制比特将上述DMRS端口指示表中列举的全部case指示到。值得指出的是以下所列举的第二控制比特的value定义仅作为示例说明，并不代表是该DMRS指示信息的唯一value定义。其中，第一状态下第一控制比特的值为0，第一状态包括：
第二控制比特指示DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息第一子状态，其中，该DMRS端口指示表中为UE单层传输提供了4个不同的DMRS端口(如表4中的port7、port8、port9、port10)，可对应定义第二控制比特的值为000、001、010和011用于指示上述4个不同端口。
第二控制比特指示DMRS端口指示表中UE下行重传层数与各DMRS端口之间的组合信息的第二子状态，其中，如表4所示，该DMRS端口指示表中为UE重传提供了3种不同定义，当双层传输时对应DMRS端口7-8，当三层传输时对应DMRS端口7-9，当四层传输时对应DMRS端口7-10，分别对应定义第二控制比特的值为100、101和110；以及
第二控制比特指示DMRS端口指示表中设置预留位置的第三子状态，定义 第二控制比特的值为111。
第二状态下第一控制比特的值为0，第二状态包括：
第二控制比特指示DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第四子状态，该DMRS端口指示表中为UE双层传输提供了两种不同的端口，如表4所示，port7-8和port7-9，分别对应第二控制比特的值可定义为000和001，该DMRS端口指示表为UE三层传输和四层传输分别提供了port7-9和port7-10，对应的第二控制比特的值可定义为010和011；以及
第二控制比特指示DMRS端口指示表中单UE5～8层传输与各DMRS端口之间的组合信息的第五子状态，该DMRS端口指示表为单UE5～8层传输分别提供了port7-11、port7-12、port7-13和port7-14，对应的第二控制比特的值可定义为100、101、110和111。
在第三状态下第一控制比特的值为1，第三状态包括：第二控制比特指示DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息的第六子状态，其中，该DMRS端口指示表中为UE单层传输提供了8个不同的DMRS端口，分别与port7-port14一一对应，对应的第二控制比特的值为000至111。
第四状态包括：第二控制比特指示DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第七子状态，其中该DMRS端口指示表为用户双层传输提供了4种不同的DMRS端口组合，分别是port7-8、port9-10、port11-12和port13-14，对应的第二控制比特的值为000、001、010和011，该DMRS端口指示表为用户三层和四层传输分别提供了2中不同的DMRS端口组合，分 别是port7-9、port11-13以及port7-10、port11-14，对应的第二控制比特的值为100、101、110和111。当第一控制比特和第二控制比特的值均相同时，由于第一状态、第二状态、第三状态和第四状态分别是在单码字传输情况下和多码字传输情况下定义的，而单码字传输或双码字传输在相关技术标准中已有指示方式，故根据第一控制比特和第二控制比特即可准确指示DMRS端口。
其中，第一子状态和第四子状态均指示下行传输总层数小于或等于4；第五子状态、第六子状态和第七子状态指示下行传输总层数大于或等于5。值得指出的是该部分定义是与PDSCH是否存在打孔位置的定义是一致的，即第一控制信息可间接反映出当前的下行传输总层数。
进一步地，根据DMRS端口指示表，为UE分配指定的DMRS端口的步骤包括：
当UE仅支持单层传输，且当前下行传输总层数小于或等于4时，根据DMRS端口指示表，为UE分配一指示为第一子状态中的一种组合情况下的DMRS端口，因为单层传输时采用单码字传输方式。在这种情况下，DMRS端口指示信息中第一控制比特的值为0，第二控制比特的值为000-100中的任一个；
当UE需要重传时，根据DMRS端口指示表，为UE分配一指示为第二子状态中的一种组合情况下的DMRS端口，因为重传是因为数据传输失败造成的，故会变为单码字传输。在这种情况下，DMRS端口指示信息中第一控制比特的值为0，第二控制比特的值为101-110中的一个。
当UE支持2～4层传输，且当前下行传输总层数小于或等于4时，根据DMRS 端口指示表，为UE分配一指示为第四子状态中的一种组合情况下的DMRS端口，当多层传输时采用双码字传输方式。在这种情况下，该DMRS端口指示信息中第一控制比特的值为0，第二控制比特的值为000-100中的任一个。
当仅有一个UE时，UE支持5～8层传输，且当前下行传输总层数大于或等于5，根据DMRS端口指示表，为UE分配一指示为第五子状态中的一种组合情况下的DMRS端口，例如单UE5层传输对应port7-11。在这种情况下，DMRS端口指示信息中第一控制比特的值为0，第二控制比特的值为对应的101-111中的一个。
当UE仅支持单层传输，单码字传输，且当前下行传输总层数大于或等于5时，根据DMRS端口指示表，为UE分配一指示为第六子状态中一种组合情况的DMRS端口指示信息。在这种情况下，DMRS端口指示信息中第一控制比特的值为1，第二控制比特的值为000-111中的任一个。
当UE支持2～层传输，双码字传输，且当前下行传输总层数小于或等于5时，根据DMRS端口指示表，为UE分配一指示为第七子状态中的一种组合情况的DMRS端口指示信息，例如当UE为3层传输时，为该UE分配port7-9或port1-13。在这种情况下，DMRS端口指示信息中第一控制比特的值为1，第二控制比特的值根据传输层数的不同可对应选择为000-111中的一个。
当需要为UE分配特定的DMRS端口时，根据DMRS端口指示表，向UE发送一指示为第三子状态的DMRS端口指示信息，即第一控制比特的值为0，第二控制比特的值为111。
综上，本公开实施例中提供的DMRS端口指示表(表4)涵盖了最大支持8层传输的全部case，通过DMRS端口指示信息定义的4比特可结合相关标准的单码字传输和双码字传输情况将该DMRS端口指示表中的全部case指示到，一般地可将DCI消息中的某4个比特作为DMRS端口指示信息，这样就节省了DCI消息的比特开销。
进一步地，在存在多个UE需要分配DMRS端口时，根据DMRS端口指示表，为UE分配指定的DMRS端口的步骤包括：根据UE当前所支持的最大下行传输层数，对UE进行降序排序得到第一排序序列；按照第一排序序列中UE的顺序和DMRS端口指示表，分别为各个UE分配对应的DMRS端口。例如，当有3个用户A、B和C时，每个用户最大支持层数分别是3、2和1，则3个用户的优先顺序为A、B、C，那么为其分配DMRS端口时将优先为A分配，如port7-9，然后再为B分配不会对A造成干扰的DMRS端口port11-12，最后为C分配port10。
进一步地，除了按照降序的方式对用户进行排序外，还可以按照升序的方式对其进行排序，具体排序方法与降序方式相似，故不再此赘述。
以上从基站侧说明了本公开实施例是如何为UE分配DMRS端口，下面将进一步提供实施上述方法的具体装置。
如图5所示，依据本公开的再一个方面，还提供了一种解调参考信号DMRS端口的指示装置，包括：
分配模块，用于根据DMRS端口指示表，为UE分配指定的DMRS端口；其 中，DMRS端口指示表中记录有物理下行共享信道PDSCH存在打孔位置和不存在打孔位置的情况下，UE下行传输层数和对应的DMRS端口之间的全部组合情况；
发送模块，用于根据为UE分配的DMRS端口的信息，向UE发送一DMRS端口指示信息；DMRS端口指示信息中包括4比特，其中，4比特包括1个指示DMRS端口指示表中UE物理下行共享信道PDSCH是否存在打孔位置的第一控制比特，以及剩余的3个指示DMRS端口指示表中UE下行传输层数和对应的DMRS端口的第二控制比特。
其中，DMRS端口指示信息包括以下指示状态：
在单码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH不存在打孔位置的第一状态；
在双码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH不存在打孔位置的第二状态；
在单码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH存在打孔位置的第三状态；以及
在双码字传输时，第一控制比特指示DMRS端口指示表中UE物理下行共享信道PDSCH存在打孔位置的第四状态。
其中，第一状态包括：第二控制比特指示DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息第一子状态，第二控制比特指示DMRS端口指示表中UE下行重传层数与各DMRS端口之间的组合信息的第二子状态，以及第二 控制比特指示DMRS端口指示表中设置预留位置的第三子状态；
第二状态包括：第二控制比特指示DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第四子状态，以及第二控制比特指示DMRS端口指示表中单UE5～8层传输与各DMRS端口之间的组合信息的第五子状态；
第三状态包括：第二控制比特指示DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息的第六子状态；
第四状态包括：第二控制比特指示DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第七子状态；
其中，第一子状态和第四子状态均指示下行传输总层数小于或等于4；
第五子状态、第六子状态和第七子状态指示下行传输总层数大于或等于5。
其中，分配模块包括：
第一分配单元，用于当UE仅支持单层传输，且当前下行传输总层数小于或等于4时，根据DMRS端口指示表，为UE分配一指示为第一子状态中的一种组合情况的DMRS端口；
第二分配单元，用于当UE需要重传时，根据DMRS端口指示表，为UE分配一指示为第二子状态中的一种组合情况的DMRS端口；
第三分配单元，用于当UE支持2～4层传输，且当前下行传输总层数小于或等于4时，根据DMRS端口指示表，为UE分配一指示为第四子状态中的一种组合情况的DMRS端口；
第四分配单元，用于当仅有一个UE传输时，UE支持5～8层传输，且当前 下行传输总层数大于或等于5，根据DMRS端口指示表，为UE分配一指示为第五子状态中的一种组合情况的DMRS端口；
第五分配单元，用于当UE仅支持单层传输，且当前下行传输总层数大于或等于5时，根据DMRS端口指示表，为UE分配一指示为第六子状态中的一种组合情况的DMRS端口；
第六分配单元，用于当UE支持2～4层传输，且当前下行传输总层数小于或等于5时，根据DMRS端口指示表，为UE分配一指示为第七子状态中的一种组合情况的DMRS端口；
第七分配单元，用于当需要为UE分配特定的DMRS端口时，根据DMRS端口指示表，向UE发送一指示为第三子状态的DMRS端口指示信息。
其中，分配模块包括：
第一排序单元，用于根据UE当前所支持的最大下行传输层数，对UE进行降序排序得到第一排序序列；
第八分配单元，用于按照第一排序序列中UE的顺序和DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
其中，分配模块还包括：
第二排序单元，用于根据UE当前所支持的最大下行传输层数，对UE进行升序排序得到第二排序序列；
第九分配单元，用于按照第二排序序列中UE的顺序和DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
需要说明的是，该装置是与上述DMRS端口的指示方法对应的装置，上述方法实施例中所有实现方式均适用于该装置的实施例中，也能达到相同的技术效果。
依据本公开的再一个方面，还提供了一种基站，包括如上所述的DMRS端口的指示装置。
本领域内的技术人员应明白，本公开的实施例可提供为方法、系统、或计算机程序产品。因此，本公开可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本公开可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本公开是参照根据本公开实施例的方法、装置(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个 流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述的是本公开的优选实施方式，应当指出对于本技术领域的普通人员来说，在不脱离本公开所述的原理前提下还可以作出若干改进和润饰，这些改进和润饰也在本公开的保护范围内。

Claims (14)

  1. 一种解调参考信号(De Modulation Reference Signal，DMRS)端口的指示方法，包括：
    根据DMRS端口指示表，为用户设备(User Equipment，UE)分配指定的DMRS端口；其中，所述DMRS端口指示表中记录有物理下行共享信道(Physical Downlink Shared Channel，PDSCH)存在打孔位置和不存在打孔位置的情况下，UE下行传输层数和对应的DMRS端口之间的全部组合情况；
    根据为所述UE分配的DMRS端口的信息，向所述UE发送一DMRS端口指示信息；所述DMRS端口指示信息中包括4比特，其中，所述4比特包括1个指示所述DMRS端口指示表中UE物理下行共享信道PDSCH是否存在打孔位置的第一控制比特，以及剩余的3个指示所述DMRS端口指示表中UE下行传输层数和对应的DMRS端口的第二控制比特。
  2. 根据权利要求1所述的DMRS端口的指示方法，其中，所述DMRS端口指示信息包括以下指示状态：
    在单码字传输时，所述第一控制比特指示所述DMRS端口指示表中UEPDSCH不存在打孔位置的第一状态；
    在双码字传输时，所述第一控制比特指示所述DMRS端口指示表中UEPDSCH不存在打孔位置的第二状态；
    在单码字传输时，所述第一控制比特指示所述DMRS端口指示表中UE PDSCH存在打孔位置的第三状态；以及
    在双码字传输时，所述第一控制比特指示所述DMRS端口指示表中UEPDSCH存在打孔位置的第四状态。
  3. 根据权利要求2所述的DMRS端口的指示方法，其中，
    所述第一状态包括：所述第二控制比特指示所述DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息第一子状态，所述第二控制比特指示所述DMRS端口指示表中UE下行重传层数与各DMRS端口之间的组合信息的第二子状态，以及所述第二控制比特指示所述DMRS端口指示表中设置预留位置的第三子状态；
    所述第二状态包括：所述第二控制比特指示所述DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第四子状态，以及所述第二控制比特指示所述DMRS端口指示表中单UE5～8层传输与各DMRS端口之间的组合信息的第五子状态；
    所述第三状态包括：所述第二控制比特指示所述DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息的第六子状态；
    所述第四状态包括：所述第二控制比特指示所述DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第七子状态；
    其中，所述第一子状态和所述第四子状态均指示下行传输总层数小于或等于4；
    所述第五子状态、所述第六子状态和所述第七子状态指示下行传输总层数 大于或等于5。
  4. 根据权利要求3所述的DMRS端口的指示方法，其中，所述根据DMRS端口指示表，为UE分配指定的DMRS端口的步骤包括：
    当所述UE仅支持单层传输，且当前下行传输总层数小于或等于4时，根据所述DMRS端口指示表，为所述UE分配一指示为第一子状态中的一种组合情况的DMRS端口；
    当所述UE需要重传时，根据所述DMRS端口指示表，为所述UE分配一指示为第二子状态中的一种组合情况的DMRS端口；
    当所述UE支持2～4层传输，且当前下行传输总层数小于或等于4时，根据所述DMRS端口指示表，为所述UE分配一指示为第四子状态中的一种组合情况的DMRS端口；
    当仅有一个UE传输时，所述UE支持5～8层传输，且当前下行传输总层数大于或等于5，根据所述DMRS端口指示表，为所述UE分配一指示为第五子状态中的一种组合情况的DMRS端口；
    当所述UE仅支持单层传输，且当前下行传输总层数大于或等于5时，根据所述DMRS端口指示表，为所述UE分配一指示为第六子状态中的一种组合情况的DMRS端口；
    当所述UE支持2～4层传输，且当前下行传输总层数小于或等于5时，根据所述DMRS端口指示表，为所述UE分配一指示为第七子状态中的一种组合情况的DMRS端口；
    当需要为UE分配特定的DMRS端口时，根据所述DMRS端口指示表，向所述UE发送一指示为第三子状态的DMRS端口指示信息。
  5. 根据权利要求1所述的DMRS端口的指示方法，其中，PDSCH不存在打孔位置表示当前UE下行传输层数小于或等于4，且下行总传输层数小于或等于4；或者当前UE下行传输层数大于4；
    PDSCH存在打孔位置表示当前UE下行传输层数大于或等于4，且下行总传输层数大于4。
  6. 根据权利要求1所述的DMRS端口的指示方法，其中，所述当存在多个UE时，根据DMRS端口指示表，为UE分配指定的DMRS端口的步骤包括：
    根据所述UE当前所支持的最大下行传输层数，对所述UE进行降序排序得到第一排序序列；
    按照所述第一排序序列中UE的顺序和所述DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
  7. 根据权利要求1所述的DMRS端口的指示方法，其中，所述当存在多个UE时，根据DMRS端口指示表，为UE分配指定的DMRS端口的步骤包括：
    根据所述UE当前所支持的最大下行传输层数，对所述UE进行升序排序得到第二排序序列；
    按照所述第二排序序列中UE的顺序和所述DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
  8. 一种解调参考信号(De Modulation Reference Signal，DMRS)端口的 指示装置，包括：
    分配模块，用于根据DMRS端口指示表，为用户设备(User Equipment，UE)分配指定的DMRS端口；其中，所述DMRS端口指示表中记录有物理下行共享信道(Physical Downlink Shared Channel，PDSCH)存在打孔位置和不存在打孔位置的情况下，UE下行传输层数和对应的DMRS端口之间的全部组合情况；
    发送模块，用于根据为所述UE分配的DMRS端口的信息，向所述UE发送一DMRS端口指示信息；所述DMRS端口指示信息中包括4比特，其中，所述4比特包括1个指示所述DMRS端口指示表中UE物理下行共享信道PDSCH是否存在打孔位置的第一控制比特，以及剩余的3个指示所述DMRS端口指示表中UE下行传输层数和对应的DMRS端口的第二控制比特。
  9. 根据权利要求8所述的DMRS端口的指示装置，其中，所述DMRS端口指示信息包括以下指示状态：
    在单码字传输时，所述第一控制比特指示所述DMRS端口指示表中UE物理下行共享信道PDSCH不存在打孔位置的第一状态；
    在双码字传输时，所述第一控制比特指示所述DMRS端口指示表中UE物理下行共享信道PDSCH不存在打孔位置的第二状态；
    在单码字传输时，所述第一控制比特指示所述DMRS端口指示表中UE物理下行共享信道PDSCH存在打孔位置的第三状态；以及
    在双码字传输时，所述第一控制比特指示所述DMRS端口指示表中UE物理 下行共享信道PDSCH存在打孔位置的第四状态。
  10. 根据权利要求9所述的DMRS端口的指示装置，其中，
    所述第一状态包括：所述第二控制比特指示所述DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息第一子状态，所述第二控制比特指示所述DMRS端口指示表中UE下行重传层数与各DMRS端口之间的组合信息的第二子状态，以及所述第二控制比特指示所述DMRS端口指示表中设置预留位置的第三子状态；
    所述第二状态包括：所述第二控制比特指示所述DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第四子状态，以及所述第二控制比特指示所述DMRS端口指示表中单UE5～8层传输与各DMRS端口之间的组合信息的第五子状态；
    所述第三状态包括：所述第二控制比特指示所述DMRS端口指示表中UE单层传输与各DMRS端口之间的组合信息的第六子状态；
    所述第四状态包括：所述第二控制比特指示所述DMRS端口指示表中UE2～4层传输与各DMRS端口之间的组合信息的第七子状态；
    其中，所述第一子状态和所述第四子状态均指示下行传输总层数小于或等于4；
    所述第五子状态、所述第六子状态和所述第七子状态指示下行传输总层数大于或等于5。
  11. 根据权利要求10所述的DMRS端口的指示装置，其中，所述分配模块 包括：
    第一分配单元，用于当所述UE仅支持单层传输，且当前下行传输总层数小于或等于4时，根据所述DMRS端口指示表，为所述UE分配一指示为第一子状态中的一种组合情况的DMRS端口；
    第二分配单元，用于当所述UE需要重传时，根据所述DMRS端口指示表，为所述UE分配一指示为第二子状态中的一种组合情况的DMRS端口；
    第三分配单元，用于当所述UE支持2～4层传输，且当前下行传输总层数小于或等于4时，根据所述DMRS端口指示表，为所述UE分配一指示为第四子状态中的一种组合情况的DMRS端口；
    第四分配单元，用于当仅有一个UE传输时，所述UE支持5～8层传输，且当前下行传输总层数大于或等于5，根据所述DMRS端口指示表，为所述UE分配一指示为第五子状态中的一种组合情况的DMRS端口；
    第五分配单元，用于当所述UE仅支持单层传输，且当前下行传输总层数大于或等于5时，根据所述DMRS端口指示表，为所述UE分配一指示为第六子状态中的一种组合情况的DMRS端口；
    第六分配单元，用于当所述UE支持2～4层传输，且当前下行传输总层数小于或等于5时，根据所述DMRS端口指示表，为所述UE分配一指示为第七子状态中的一种组合情况的DMRS端口；
    第七分配单元，用于当需要为UE分配特定的DMRS端口时，根据所述DMRS端口指示表，向所述UE发送一指示为第三子状态的DMRS端口指示信息。
  12. 根据权利要求8所述的DMRS端口的指示装置，其中，所述分配模块包括：
    第一排序单元，用于根据所述UE当前所支持的最大下行传输层数，对所述UE进行降序排序得到第一排序序列；
    第八分配单元，用于按照所述第一排序序列中UE的顺序和所述DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
  13. 根据权利要求8所述的DMRS端口的指示装置，其中，所述分配模块还包括：
    第二排序单元，用于根据所述UE当前所支持的最大下行传输层数，对所述UE进行升序排序得到第二排序序列；
    第九分配单元，用于按照所述第二排序序列中UE的顺序和所述DMRS端口指示表，分别为各个UE分配对应的DMRS端口。
  14. 一种基站，包括如权利要求8至13任一项所述的DMRS端口的指示装置。
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CN106162890B (zh) 2020-02-18
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US20180041320A1 (en) 2018-02-08
CN106162890A (zh) 2016-11-23

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