[go: up one dir, main page]

WO2011099663A1 - Station de base, terminal et procédé dans une application multi utilisateurs à entrées et sorties multiples - Google Patents

Station de base, terminal et procédé dans une application multi utilisateurs à entrées et sorties multiples Download PDF

Info

Publication number
WO2011099663A1
WO2011099663A1 PCT/KR2010/000911 KR2010000911W WO2011099663A1 WO 2011099663 A1 WO2011099663 A1 WO 2011099663A1 KR 2010000911 W KR2010000911 W KR 2010000911W WO 2011099663 A1 WO2011099663 A1 WO 2011099663A1
Authority
WO
WIPO (PCT)
Prior art keywords
information
mimo
transparent
terminal
rank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2010/000911
Other languages
English (en)
Inventor
Jianjun Li
Kyoungmin Park
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pantech Co Ltd
Original Assignee
Pantech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pantech Co Ltd filed Critical Pantech Co Ltd
Priority to KR1020127020586A priority Critical patent/KR20120135223A/ko
Priority to PCT/KR2010/000911 priority patent/WO2011099663A1/fr
Publication of WO2011099663A1 publication Critical patent/WO2011099663A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • 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
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0473—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking constraints in layer or codeword to antenna mapping into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/0036—Interference mitigation or co-ordination of multi-user interference at the receiver
    • 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
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • the present invention relates to Multiple Input Multiple Output(MIMO) in wireless communication system.
  • MIMO Multiple Input Multiple Output
  • a method in the multiuser Multiple-Input Multiple-Output system comprising: selecting an information for a non-transparent multiuser Multiple-Input Multiple-Output which comprises the total rank and (the total number of layers) one specific terminal’s own information; selecting an information related to a demodulation reference(DM-RS) which; and sending the specific terminal an index indicating both the information on the non-transparent MU-MIMO and the information related to the DM-RS.
  • DM-RS demodulation reference
  • a method in the Multiple-Input Multiple-Output(MIMO), comprising: sending to the specific terminal an index indicating both the information on the non-transparent MU-MIMO and the information related to the DM-RS; and sending to the specific terminal a demodulation reference(DM-RS).
  • a base station in the multi-user Multiple-Input Multiple-Output(MU-MIMO) comprising: a layer mapper mapping a codeword to the layers together with the signalling comprise an index indicating both the information on the non-transparent MU-MIMO and the information related to the DM-RS in control channel; a precoder precoding a mapped set of symbols using a precoding matrix; a resource element mapper mapping a precoded set of symbols for each antenna port to resource elements; and an OFDM signal generator generating an OFDM signal for each antenna port to specific terminal among all the terminals.
  • a layer mapper mapping a codeword to the layers together with the signalling comprise an index indicating both the information on the non-transparent MU-MIMO and the information related to the DM-RS in control channel
  • a precoder precoding a mapped set of symbols using a precoding matrix
  • an OFDM signal generator generating an OF
  • a terminal in the multi-user Multiple-Input Multiple-Output(MU-MIMO) comprising; a RF receiver complex-valued time-domain OFDM signal for each antenna port from the base station; a decoder decoding the received complex-valued time-domain OFDM signal into the original information based on the DL signalling includes an index indicating both the information on the non-transparent MU-MIMO and the information related to the DM-RS and patterned DM-RSs from the base station where the information on the non-transparent MU-MIMO comprises the total rank(the total number of layers) and specific terminal’s own information and the information related to the DM-RS comprises the DM-RS pattern; and a interference cancellator to do interference cancellation using the signaled information and patterned DM-RSs.
  • FIG.1 is a system configuration of MU-MIMO(Multi-User Multi-Input Multi-Output) wireless communication system.
  • FIG.2 is the block diagram of a base station according to the other embodiment
  • FIG.3 is an indicator table of DL signaling information to support non-transparent MU-MIMO according to another embodiment.
  • FIG. 4 is a pattern of DM-RS in the resource block for rank 2 and 4.
  • FIG.5 is the diagram of a RS resource allocator and a RS generator according to another embodiment.
  • FIG.6 is the flowchart of a method for DL control signaling of non-transparent MU-MIMO according to another embodiment.
  • FIG.7 is the flowchart of a method for sending the MIMO mode, the information on non-transparent MU-MIMO and the used DM-RS related information at the form of an indicator index.
  • FIG.8 is flowchart of the DM-RS indicator table generation algorithm of FIG.3.
  • FIG.9 is the block diagram of a terminal according to another embodiment
  • FIG.10 is the flowchart of a method for operating received control signal and DM-RS in MU-MIMO wireless communication system.
  • MIMO multiple-input and multiple-output
  • SU-MIMO single-user MIMO
  • MU-MIMO multi-user MIMO
  • multi-user MIMO In single-user MIMO(SU-MIMO), all the spatial layers within allocated resource blocks are addressed to the same mobile terminal or UE. In the case of multi-user MIMO(MU-MIMO), different spatial layers within allocated resource blocks can be addressed to different mobile terminals or UEs. Under correlated antenna scenarios, multi-user MIMO(MU-MIMO) can improve cell capacity as orthogonal spatial beams can be created for mobile terminals at different spatial locations in the cell.
  • the LTE(Long Term Evolution) system supports multi-user MIMO(MU-MIMO) for the correlated channel conditions with single layer transmission to the mobile terminal.
  • the LTE(Long Term Evolution) system does not limit the number of mobile terminals that can be scheduled using the same resource blocks.
  • FIG.1 is a system configuration of MU-MIMO(Multi-User Multi-Input Multi-Output) wireless communication system according to one embodiment.
  • a multi-user MIMO(MU-MIMO) wireless communication system 100 is a set of advanced MIMO technologies that exploit the availability of multiple independent radio terminals 120 to 140 in order to enhance the communication capabilities of each individual terminal.
  • MU-MIMO multi-user MIMO
  • different spatial layers of a base station 110 can be addressed to different mobile terminals or UEs 120 to 140.
  • the base station 110 refers to a fixed station communicating with the terminals 120 to 140.
  • the base station 110 may be a Node-B, eNB(evolved Node-B), BTS(Base Transceiver System), Access Point or Relay Node.
  • the terminals 120 to 140 refer to the user terminal in wireless communication system.
  • the terminals 120 and 130 may be UE(User Equipment) of WCDMA, LTE and HSPA, MS(Mobile Station) of GSM, UT(User Terminal), SS(Subscriber Station) or a wireless device and so on.
  • the term layer is synonymous with stream. For spatial multiplexing, at least two layers must be used. The number of layers of the base station 110 is always less than or equal to the number of antennas.
  • the multi-user MIMO(MU-MIMO) wireless communication system 100 is non-transparent applied to several embodiment.
  • non-transparent in respect of MU-MIMO wireless communication system 100 means that one terminal 120 receiving a data transmission knows at least whether or not another terminal 130 is co-scheduled in the same resource blocks.
  • downlink signaling needs to indicate to one terminal 120 whether a downlink data transmission to another terminal 130 is taking place in the same resource block.
  • no downlink signaling is provided to indicate to a terminal whether a downlink transmission to another terminal is taking place in the same resource block.
  • the terminals 120 to 140 must be informed of which DM-RS pattern is being used.
  • the base station 110 can inform the terminals 120 to 140 of the DMRS pattern used either by dynamic signaling or by higher layer signaling.
  • the terminals 120 to 140 can know other scheduled terminal’s information.
  • non-transparent MU-MIMO 100 assistance may be given to the terminals 120 to 140 to support more advanced receiver processing.
  • This can include techniques such as selecting optimized MMSE (Minimum Mean Square Error) combining weights in the receiver, or non-linear interference cancellation techniques.
  • MMSE Minimum Mean Square Error
  • MIMO-SDMA multiple access MIMO
  • MIMO-SDMA many transmit antenna MIMO-SDMA
  • Cooperative MIMO Network MIMO
  • Ad-hoc MIMO are all family terminologies within MU-MIMO applied to several embodiments as described below.
  • FIG.2 is the block diagram of a base station in MU-MIMO wireless communication system according to the other embodiment.
  • the base station 200 in MU-MIMO wireless communication system comprises a channel encoder 210, a scrambler 220, a modulation mapper 230, a layer mapper 240, a precoder 250, a resource element mapper 260, a RS-related apparatus 270 and a OFDM signal generator 280.
  • the channel encoder 210, the scrambler 220 and the modulation mapper 230 may be omitted or combined with other elements.
  • the channel encoder 210 encodes the data from the higher layer and control information into coded bits.
  • the control information may include not only general information on downlink scheduling assignments, uplink scheduling grants and power control commands but also the MIMO mode, an information on non-transparent MU-MIMO and the used DMRS related information.
  • the MIMO mode, the information on non-transparent MU-MIMO and the used DM-RS related information may be included in DCI format of coded control information at the form of an indicator index as described below referring to FIG.3.
  • FIG.3 is an indicator table of DL signaling information to support non-transparent MU-MIMO according to another embodiment.
  • an indicator table of DL signaling information to support non-transparent MU-MIMO may comprise an index at the column as well as the MIMO mode, the information on non-transparent MU-MIMO and the used DM-RS related information at the row.
  • the size of the DMRS indicator table can be reduced so that the overhead can be reduced accordingly.
  • the index of the indication table of FIG.3 refers to a DM-RS index because it indicates the DM-RS related information such as a DM-RS pattern. But the index of the indication table of FIG.3 may refer to any other wording because it indicates the DM-RS related information as well as the MIMO mode and the information on non-transparent MU-MIMO.
  • the MIMO mode may be either SU-MIMO where all the spatial layers within allocated resource blocks are addressed to the same mobile terminal or UE or MU-MIMO where different spatial layers can be addressed to different mobile terminals or UEs.
  • the information on non-transparent MU-MIMO may include the total rank at the base station 110 and the specific scheduled mobile terminal’s rank and antenna port information.
  • the total rank may mean the total number of layers at the base station.
  • the total rank of the base station 110 is more than or equal to each terminal’s rank.
  • the total rank of the base station 110 may be 1 to 8.
  • the maximum total rank of the base station 110 may be 4, but it be limited thereof.
  • the maximum total rank of the base station 110 may be limited thereof.
  • the specific scheduled mobile terminal’s rank is the number of layers at the specific mobile terminal such as the terminal 120.
  • each terminal’s rank is less than or equal to the total rank of the base station 110.
  • the maximum number of each terminal’s rank may be 2, but it be limited thereof.
  • the maximum number of each terminal’s rank may be limited thereof.
  • the antenna ports information indicates which antenna port is using for each terminal.
  • each of terminals 120 to 140 knows the total interference information based on the total rank and its own rank.
  • Each of terminals 120 to 140 can know the other terminals’s ranks which is equal to the difference between the total rank and its own rank.
  • the DM-RS related information may include a used DM-RS pattern which may inform each terminal 120 to 140 of which DM-RS pattern is being used.
  • the special DM-RS pattern may be various.
  • the special DM-RS pattern may be either a DM-RS pattern 1 or a DM-RS pattern 2.
  • Each of DM-RS patterns may have its own DM-RS rank.
  • the number in the parenthesis of the indication table of FIG.3 refers to its own DM-RS rank of each pattern.
  • Pattern 1(2) of DM-RS pattern means that the DM-RS pattern is DM-RS pattern 1 and the number of DM-RS rank is 2.
  • DM-RSs of layers 0 and 1 are repeatedly allocated into the same 12 REs(Resource elements) of each resource block with different orthogonal cover code such as walsh code.
  • DM-RSs of layers 0 and 1 are repeatedly allocated into the same 12 REs(Resource elements) of each resource block and DM-RSs of layers 2 and 3 are repeatedly allocated into another same 12 REs of each resource block.
  • DM-RSs of layers 0 to 3 are repeatedly allocated into the same 12 REs(Resource elements) of each resource block and DM-RSs of layers 4 to 7 are repeatedly allocated into another same 12 REs of each resource block.
  • DM-RS indices 0, 3, 8, 15-19 are used for the normal SU-MIMO transmission mode for rank 1-8.
  • DM-RS indices 1 and 2 are used for the MU-MIMO transmission mode for the total rank 2 with two transmission layers.
  • DM-RS indices 4 to 7 are used for the MU-MIMO transmission mode for the total rank 3 with three transmission layers.
  • DM-RS indices 9 to 14 are used for the MU-MIMO transmission mode for the total rank 4 with four transmission layers.
  • the total number of bits for DM-RS indices is 5.
  • the minimum number of the total bits for the specific DM-RS index which may indicate all of the specific total rank, the specific terminal’s rank, the specific DM-RS pattern, the specific DM-RS antenna port and the specific MIMO mode is 6 because it needs 2 or 3 bits for the total rank at the base station 110.
  • the scrambler 220 scrambles coded bits in each of the codewords to be transmitted on a physical channel.
  • the modulation mapper 230 modulates scrambled bits to generate complex-valued modulation symbols.
  • the layer mapper 240 maps the complex-valued modulation symbols onto one or several transmission layers.
  • the precoder 250 precodes the complex-valued modulation symbols on each layer for transmission on the antenna ports.
  • the precoder 250 precodes data and control information( and ) by means of each of precoding matrices( and ).
  • the resource element mapper 260 maps complex-valued modulation symbols for each antenna port to resource elements.
  • the RS related apparatus 270 generally generate a downlink reference signal(RS) such as a DM-RS(demodulation reference signal) and provides the generated the reference signal with resource element mapper 260 to perform allocation function into time-frequency resource.
  • RS downlink reference signal
  • the DM-RS may be used in order to transfer the precoding matrix from the base station 110 to the terminals 120 to 140 in the MIMO wireless communication system 100.
  • the terminals 120 to 140 can recover the information for its own data when it know the precoding matrix .
  • each terminal must also know on which layer it is going to receive the transmission, and use the appropriate DM-RS antenna port for channel estimation and demodulation.
  • FIG. 4 is one example of a pattern of a DM-RS in the resource block for rank 2 and 4.
  • the DM-RS is allocated into the resource blocks with special DM-RS pattern.
  • the top view of FIG.4 shows special DM-RS pattern for rank 2 with two transmission layers.
  • DM-RSs of layers 0 and 1 are repeatedly allocated into the same 12 REs(Resource elements) of each resource block with different orthogonal cover code such as walsh code.
  • the bottom view of FIG.4 shows special DM-RS pattern for rank 4 with four transmission layers.
  • DM-RSs of layers 0 and 1 are repeatedly allocated into the same 12 REs(Resource elements) of each resource block and DM-RSs of layers 2 and 3 are repeatedly allocated into another same 12 REs of each resource block.
  • each terminal must also know on which layer it is going to receive the transmission based on the information for non-transparent MU-MIMO as shown in FIG.3.
  • each of the terminals 120 to 140 can know its own precoding matrix from the base station 110 and then can recover the information for its own data when it know the precoding matrix .
  • FIG.5 is the diagram of a RS resource allocator and a RS generator of the RS-related apparatus 270 in FIG.2 according to another embodiment.
  • the RS related apparatus 270 may comprise a RS generator 510 and a RS resource allocator 520.
  • the RS generator 510 generates the downlink DM-RS(demodulation reference signal).
  • the RS resource allocator 520 provides the generated the downlink DM-RS with resource element mapper 260 to perform allocation function into time-frequency resource with special DM-RS pattern as shown in FIG.4.
  • each of the terminals 120 to 140 can know its own precoding matrix from the base station 110 and then can recover the information for its own data when it know the precoding matrix based on the DM-RS pattern as shown in FIG.4. It will be described below that each of the terminals 120 to 140 cancels the interference and recovers the information for its own data by using the total rank, specific terminal’s own rank and antenna port and DM-RS pattern, referring to FIG.10.
  • the OFDM signal generator 280 generates complex-valued time-domain OFDM signal for each antenna port.
  • FIG.6 is the flowchart of a method for DL control signaling of non-transparent MU-MIMO according to another embodiment.
  • a method for DL control signaling of non-transparent MIMO may send to the specific mobile terminal the control information including not only general information on downlink scheduling assignments, uplink scheduling grants and power control commands but also the MIMO mode, an information on non-transparent MU-MIMO and the used DMRS related information.
  • the MIMO mode, the information on non-transparent MU-MIMO and the used DM-RS related information may be included in DCI format of coded control information at the form of an indicator index as described below referring to FIG.3.
  • the specific DM-RS index may designate the specific total rank, the specific terminal’s rank, the specific DM-RS pattern, the specific DM-RS antenna port and the specific MIMO mode as described above.
  • the specific indicator index 6 designate the total rank 3, the specific terminal’s rank 1, the specific DM-RS pattern Pattern 2(4), the specific DM-RS antenna port 2 and the MU-MIMO mode.
  • the specific indicator index 7 designate the total rank 3, the specific terminal’s rank 2, the specific DM-RS pattern Pattern 2(4), the specific DM-RS antenna port 0, 1 and the MU-MIMO mode.
  • FIG.7 is the flowchart of a method for sending the MIMO mode, the information on non-transparent MU-MIMO and the used DM-RS related information at the form of an indicator index.
  • the information related to a demodulation reference(DM-RS) is selected at S612.
  • the DM-RS index indicating both the information on the non-transparent MU-MIMO and the information related to the DM-RS is sent to the specific terminal at S613.
  • the index also indicates the specific MIMO mode for the specific terminal.
  • FIG.8 is flowchart of the DM-RS indicator table generation algorithm of FIG.3.
  • the index of the number of total layers i is set to be 1 at S614.
  • the number of the mobile terminal’s rank j is set to be 1 at S616. If not, the process is finished.
  • the DM-RS index table is generated. As a result, the DM-RS index table of the DM-RS indices 0 to 19 is generated.
  • the DM-RS indices 0, 3, 8, 15-19 are used for the normal SU-MIMO transmission mode for rank 1-8.
  • DM-RS indices 1 and 2 are used for the MU-MIMO transmission mode for the total rank 2 with two transmission layers.
  • DM-RS indices 4 to 7 are used for the MU-MIMO transmission mode for the total rank 3 with three transmission layers.
  • DM-RS indices 9 to 14 are used for the MU-MIMO transmission mode for the total rank 4 with four transmission layers.
  • the index is contained in DCI format of control information.
  • the control information may be transmitted from the base station to the terminal via a control channel, for example PDCCH(Physical Downlink Control Channel).
  • the specific indicator index 6 designate the total rank 3, the specific terminal’s rank 1, the specific DM-RS pattern Pattern 2(4), the specific DM-RS antenna port 2 and the MU-MIMO mode.
  • the specific indicator index 7 designate the total rank 3, the specific terminal’s rank 2, the specific DM-RS pattern Pattern 2(4), the specific DM-RS antenna port 0, 1 and the MU-MIMO mode.
  • the downlink DM-RS(demodulation reference signal) is generated and patterned into time-frequency resource with special DM-RS pattern pattern shown in FIG.4 at S620.
  • the patterned DM-RSs are transferred from the base station 110 to the terminals 120 to 140 in form of complex-valued time-domain OFDM signal for each antenna port at S630.
  • the DM-RS may be used in order to transfer the precoding matrix from the base station 110 to the terminals 120 to 140 in the MIMO wireless communication system 100.
  • the terminals 120 to 140 can recover the information for its own data when it know the precoding matrix .
  • DM-RS pattern for rank 4 DM-RSs of layers 0 and 1 are repeatedly allocated into the same 12 REs(Resource elements) of each resource block and DM-RSs of layers 2 and 3 are repeatedly allocated into another same 12 REs of each resource block.
  • each terminal must also know on which layer it is going to receive the transmission based on the DM-RS index indicating both the information on the non-transparent MU-MIMO and the information related to the DM-RS contained in the DCI format of the control information as shown in FIG.3 and table 1.
  • the DM-RS index indicating both the information on the non-transparent MU-MIMO and the information related to the DM-RS contained in the DCI format of the control information as shown in FIG.3 and table 1.
  • each of the terminals 120 to 140 can know its own precoding matrix from the DMRS pattern the base startion 110 and then can recover the information for its own data when it know the precoding matrix .
  • One of the terminals UE1 is in rank 2 with antenna ports o and 1 where the DM-RS pattern at one of the terminals UE1 is described in table 4.
  • the transmission from other antenna port, for example an antenna port 2 is an interference to be removed using the interference cancellation in view of one of the terminals UE1.
  • the other of the terminals UE2 is in rank 1 with antenna port 2 where the DM-RS pattern at the other of the terminals UE2 is described in table 4.
  • the transmission from other antenna port for example an antenna ports 0 and 1, is an interference to be removed using the interference cancellation in view of the other of the terminals UE2.
  • FIG.9 is the block diagram of a terminal according to another embodiment.
  • a terminal 700 comprises a RF receiver 710, a decoder 720 and an interference cancellator 730.
  • the RF receiver 710 receives complex-valued time-domain OFDM signal for each antenna port from the base station.
  • the decoder 720 decodes the received complex-valued time-domain OFDM signal into the original information such as the control information ,then the data from the base station 110 to the terminals 120 to 140.
  • the decoded information includes the control information including not only general information on downlink scheduling assignments, uplink scheduling grants and power control commands but also the MIMO mode, an information on non-transparent MU-MIMO and the used DMRS related information.
  • the MIMO mode, the information on non-transparent MU-MIMO and the used DM-RS related information may be included in DCI format of coded control information at the form of an indicator index of FIG.3.
  • the interference cancellator 730 is configured to remove the interference from the other terminal included in the MU-MIMO using the control information and the patterned DM-RSs.
  • FIG.10 is the flowchart of a method for operating received control signal and DM-RS in MU-MIMO wireless communication system.
  • the terminal 700 receives the control information as shown in FIG.3 and patterned DM-RSs as shown in FIG.4 from the base station 110 to the terminals 120 to 140 by means of complex-valued time-domain OFDM signal for each antenna port at S810.
  • the terminal 700 separate its own data from all the data by means of interference cancellation technique at S820.
  • the terminal 700 can know the total rank and its own rank and the number of antenna ports from the control information on non-transparent MU-MIMO.
  • each of the terminals 120 to 140 cancels the interference and recovers the information for its own data by using the total rank, specific terminal’s own rank and antenna port as well as DM-RS at terminal’s perspective.
  • the mobile terminal 700 Based on the DM-RS indicator index, not only the MIMO mode and the used DMRS pattern but also the total rank (the total number of layers) at the base station 110 and the specific scheduled terminal’s rank and antenna ports information are known by the mobile terminal 700.
  • the mobile terminal 700 can know the total interference information.
  • the rank of the interference is the difference between the total rank between this terminal’s own rank.
  • the received signal can be expressed as follows.
  • H NrXNt channel matrix at the terminal i and is the precoding matrix for the terminal i.
  • n is the noise at the terminal.
  • the channel matrix H can be known from the well-known downlink channel estimation. Because each terminal 700 included in the MU-MIMO 100 can also know the antenna ports information of orthogonal DMRS based on this DL signaling, the precoding matrix for the terminal i can be known from its own antenna ports information of orthogonal DMRS.
  • the antenna port of all the interference can also be known even if the terminal 700 do not know the interference of which terminals is derived.
  • the terminal i can get its own date symbols as follows:
  • MMSE can make the non-transparent MU-MIMO have much better performance than the zero forcing detection. It is the optimal linear detection for the non-transparent MU-MIMO.
  • the DL signaling overhead can be further reduced.
  • the total rank (the total number of layers) at the base station and the specific scheduled terminal’s rank and antenna ports information are known at the mobile terminal.
  • the mobile terminal can know the total interference information. It is good for the interference mitigation at the mobile terminal side. So it can also have better performance than the non-transparent MU-MIMO.
  • the methods and systems as shown and described herein may be implemented in software stored on a computer-readable medium and executed as a computer program on a general purpose or special purpose computer to perform certain tasks.
  • the elements used to perform various signal processing steps at the transmitter(e.g., coding and modulating the data, precoding the modulated signals, preconditioning the precoded signals, and so on) and/or at the receiver(e.g., recovering the transmitted signals, demodulating and decoding the recovered signals, and so on) may be implemented within one or more application specific integrated circuits(ASICs), digital signal processors(DSPs), digital signal processing devices (DSPDs), programmable logic devices(PLDs), field programmable gate arrays(FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • a software implementation may be used, whereby some or all of the signal processing steps at each of the transmitter and receiver may be implemented with modules(e.g., procedures, functions, and so on) that perform the functions described herein. It will be appreciated that the separation of functionality into modules is for illustrative purposes, and alternative embodiments may merge the functionality of multiple software modules into a single module or may impose an alternate decomposition of functionality of modules.
  • the software code may be executed by a processor or controller, with the code and any underlying or processed data being stored in any machine-readable or computer-readable storage medium, such as an on-board or external memory unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à une application à entrées et sorties multiples (MIMO) dans un système de communication sans fil.
PCT/KR2010/000911 2010-02-12 2010-02-12 Station de base, terminal et procédé dans une application multi utilisateurs à entrées et sorties multiples Ceased WO2011099663A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020127020586A KR20120135223A (ko) 2010-02-12 2010-02-12 다중 사용자 다중입력 다중출력 시스템에서의 기지국 및 단말, 방법
PCT/KR2010/000911 WO2011099663A1 (fr) 2010-02-12 2010-02-12 Station de base, terminal et procédé dans une application multi utilisateurs à entrées et sorties multiples

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2010/000911 WO2011099663A1 (fr) 2010-02-12 2010-02-12 Station de base, terminal et procédé dans une application multi utilisateurs à entrées et sorties multiples

Publications (1)

Publication Number Publication Date
WO2011099663A1 true WO2011099663A1 (fr) 2011-08-18

Family

ID=44367920

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2010/000911 Ceased WO2011099663A1 (fr) 2010-02-12 2010-02-12 Station de base, terminal et procédé dans une application multi utilisateurs à entrées et sorties multiples

Country Status (2)

Country Link
KR (1) KR20120135223A (fr)
WO (1) WO2011099663A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013109099A1 (fr) * 2012-01-18 2013-07-25 엘지전자 주식회사 Procédé et appareil pour fonctionnement à base de canal de commande amélioré dans un système de communication sans fil
WO2013151280A1 (fr) * 2012-04-03 2013-10-10 엘지전자 주식회사 Procédé et appareil de transmission de données
WO2014113969A1 (fr) * 2013-01-25 2014-07-31 华为技术有限公司 Procédé de décodage de canal de liaison descendante, procédé de transmission d'informations de liaison descendante, équipement utilisateur et station de base
WO2014176967A1 (fr) * 2013-04-28 2014-11-06 中兴通讯股份有限公司 Procédé, système et dispositif pour sélectionner des informations de motif de signal de référence de démodulation
WO2015002479A1 (fr) * 2013-07-04 2015-01-08 엘지전자 주식회사 Procédé et dispositif pour émettre un signal de référence dans un système de communication sans fil prenant en charge de multiples antennes
US10148379B2 (en) 2013-02-08 2018-12-04 Lg Electronics Inc. Method for transmitting network assistance information for removing interference and serving cell base station
EP3515141A4 (fr) * 2016-09-30 2019-08-28 Huawei Technologies Co., Ltd. Procédé et dispositif d'obtention et de distribution d'informations de configuration de port drms
CN110463309A (zh) * 2017-03-31 2019-11-15 华为技术有限公司 解调参考信号开销减少的系统和方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140121244A (ko) * 2013-04-05 2014-10-15 주식회사 팬택 소형 셀 환경에서 참조 신호 전송 방법 및 장치

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
HICHAN MOON, RADIO INTERFACE TECHNOLOGY FOR IMT-ADVANCED, 30 November 2009 (2009-11-30), Retrieved from the Internet <URL:www.itu.int/ITU-D/asp/CMS/Events/2009/CoE/4Gmobile/Session10_MOON.pdf> *
HUAWEI: "Transparency of MU-MIMO", 3GPP, RL-094710, 30 November 2009 (2009-11-30), Retrieved from the Internet <URL:http://www.3gpp.com/ftp/specs/html-info/TDocExMtg--Rl-59--27294.htm> *
MOTOROLA: "Views on Transparency of MU-MIMO", 3GPP,R1-094684, 30 November 2009 (2009-11-30), Retrieved from the Internet <URL:http://www.3gpp.com/ftp/specs/html-info/TDocExMtg--Rl-59--27294.htm> *

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9814035B2 (en) 2012-01-18 2017-11-07 Lg Electronics Inc. Method and apparatus for enhanced control channel-based operation in wireless communication system
US10560931B2 (en) 2012-01-18 2020-02-11 Lg Electronics Inc. Method and apparatus for enhanced control channel-based operation in wireless communication system
US10085251B2 (en) 2012-01-18 2018-09-25 Lg Electronics Inc. Method and apparatus for enhanced control channel-based operation in wireless communication system
WO2013109099A1 (fr) * 2012-01-18 2013-07-25 엘지전자 주식회사 Procédé et appareil pour fonctionnement à base de canal de commande amélioré dans un système de communication sans fil
US9345013B2 (en) 2012-01-18 2016-05-17 Lg Electronics Inc. Method and apparatus for enhanced control channel-based operation in wireless communication system
US9706540B2 (en) 2012-01-18 2017-07-11 Lg Electronics Inc. Method and apparatus for enhanced control channel-based operation in wireless communication system
US9723606B2 (en) 2012-01-18 2017-08-01 Lg Electronics Inc. Method and apparatus for enhanced control channel-based operation in wireless communication system
WO2013151280A1 (fr) * 2012-04-03 2013-10-10 엘지전자 주식회사 Procédé et appareil de transmission de données
US9295058B2 (en) 2012-04-03 2016-03-22 Lg Electronics Inc. Method and apparatus for transmitting data
US9813213B2 (en) 2013-01-25 2017-11-07 Huawei Technologies Co., Ltd. Downlink channel decoding method, downlink information transmission method, user equipment, and base station
WO2014113969A1 (fr) * 2013-01-25 2014-07-31 华为技术有限公司 Procédé de décodage de canal de liaison descendante, procédé de transmission d'informations de liaison descendante, équipement utilisateur et station de base
US10985886B2 (en) 2013-01-25 2021-04-20 Huawei Technologies Co., Ltd. Downlink channel decoding method, downlink information transmission method, user equipment, and base station
US10148379B2 (en) 2013-02-08 2018-12-04 Lg Electronics Inc. Method for transmitting network assistance information for removing interference and serving cell base station
WO2014176967A1 (fr) * 2013-04-28 2014-11-06 中兴通讯股份有限公司 Procédé, système et dispositif pour sélectionner des informations de motif de signal de référence de démodulation
WO2015002479A1 (fr) * 2013-07-04 2015-01-08 엘지전자 주식회사 Procédé et dispositif pour émettre un signal de référence dans un système de communication sans fil prenant en charge de multiples antennes
US10135588B2 (en) 2013-07-04 2018-11-20 Lg Electronics Inc. Method and device for transmitting reference signal in wireless communication system supporting multiple antennas
EP3515141A4 (fr) * 2016-09-30 2019-08-28 Huawei Technologies Co., Ltd. Procédé et dispositif d'obtention et de distribution d'informations de configuration de port drms
US10951372B2 (en) 2016-09-30 2021-03-16 Huawei Technologies Co., Ltd. DMRS port configuration information obtaining method, DMRS port configuration information delivery method, and apparatus
CN110463309A (zh) * 2017-03-31 2019-11-15 华为技术有限公司 解调参考信号开销减少的系统和方法
US11012210B2 (en) 2017-03-31 2021-05-18 Futurewei Technologies, Inc. System and method for demodulation reference signal overhead reduction
CN110463309B (zh) * 2017-03-31 2022-09-16 华为技术有限公司 解调参考信号开销减少的系统和方法

Also Published As

Publication number Publication date
KR20120135223A (ko) 2012-12-12

Similar Documents

Publication Publication Date Title
WO2011099663A1 (fr) Station de base, terminal et procédé dans une application multi utilisateurs à entrées et sorties multiples
WO2011043497A1 (fr) Précodage et informations de canal de retour dans un système de communication sans fil
WO2011083972A2 (fr) Procédé et système permettant un regroupement de blocs de ressources dans des systèmes lte-a
WO2011052833A1 (fr) Procédé et émetteur permettant de transmettre un signal et récepteur associé dans un système de communication sans fil
WO2011031019A2 (fr) Procédé et appareil pour émission du signal descendant dans un système de communication sans fil de type mimo
WO2013151357A1 (fr) Détermination d&#39;informations de qualité de canal dans des systèmes d&#39;antenne avancé
WO2010151092A2 (fr) Procédé et dispositif de transmission de signaux de référence dans une transmission de liaison montante à entrées multiples sorties multiples (mimo)
WO2016208959A1 (fr) Procédé et appareil pour transmission de superposition multi-utilisateurs
WO2011052911A2 (fr) Procédé d&#39;émission/réception d&#39;un signal de référence descendant, et station de base et équipement utilisateur l&#39;utilisant
WO2013151277A1 (fr) Appareil et procédé pour prendre en charge un fonctionnement à entrée multiple sortie multiple multi-utilisateur d&#39;ordre supérieur pour les systèmes de communication sans fil
WO2013141661A1 (fr) Procédé et appareil de conception de mode de transmission pour la porteuse d&#39;extension d&#39;un système lte avancé
WO2010090415A2 (fr) Appareil et procédé de transmission de signal dans un système de communication sans fil
WO2010120106A2 (fr) Transmissions mimo à plusieurs utilisateurs dans des systèmes de communication sans fil
WO2009110759A2 (fr) Procédé de transmission de données dans un système à antennes multiples
WO2011090282A2 (fr) Procédé et station de base pour transmission de données de liaison descendante, et procédé et dispositif utilisateur pour réception de données de liaison descendante
WO2011105827A2 (fr) Procédé et système pour indiquer un bloc de transport activé
WO2012148207A2 (fr) Appareil et procédé destinés a émettre/recevoir un signal de référence dans un système de communication sans fil
WO2011025278A2 (fr) Procédé et dispositif d&#39;émission/réception d&#39;un signal dans un système de communication sans fil prenant en charge la transmission multi-utilisateur mimo
WO2011016691A2 (fr) Procédé et appareil d&#39;émission de signaux montants dans un système de communication sans fil pour la prise en charge d&#39;une transmission par antennes multiples
WO2018038410A1 (fr) Procédé de transmission/détection de données basé sur un procédé d&#39;accès multiple non orthogonal, et dispositif associé
WO2010151046A2 (fr) Appareil et procédé d&#39;attribution de puissance pour système de communication sans fil, et émetteur-récepteur utilisant cette forme de transmission du signal
WO2011046413A2 (fr) Procédé et appareil d&#39;émission de signal de référence mimo multi-utilisateurs dans un système de communication sans fil pour assistance à un relais
WO2011152638A2 (fr) Procédé pour le précodage différentiel et station de base prenant en charge ce procédé
WO2010056008A2 (fr) Procédés d’émission/réception de signaux dans des systèmes à entrées et sorties multiples
WO2012047039A2 (fr) Procédé et appareil de transmission et de réception de données

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10845834

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20127020586

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10845834

Country of ref document: EP

Kind code of ref document: A1