WO2011097951A1 - 一种解调参考符号端口映射的方法及设备 - Google Patents
一种解调参考符号端口映射的方法及设备 Download PDFInfo
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- WO2011097951A1 WO2011097951A1 PCT/CN2011/000191 CN2011000191W WO2011097951A1 WO 2011097951 A1 WO2011097951 A1 WO 2011097951A1 CN 2011000191 W CN2011000191 W CN 2011000191W WO 2011097951 A1 WO2011097951 A1 WO 2011097951A1
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- codeword
- reference symbol
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- 238000013507 mapping Methods 0.000 title claims abstract description 139
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims description 143
- 238000010586 diagram Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/28—Systems using multi-frequency codes with simultaneous transmission of different frequencies each representing one code element
-
- 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
- H04L5/0037—Inter-user or inter-terminal allocation
-
- 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
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1893—Physical mapping arrangements
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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
- H04L5/0001—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
- H04L5/003—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
-
- 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
Definitions
- the present invention relates to the field of digital communications, and in particular, to a method and apparatus for demodulating reference symbol port mapping. Background technique
- 3GPP 3rd Generation Partnership Project
- LTE Long Term Evolution
- the goal is to develop 3GPP wireless access.
- Technology is evolving toward high data rates, low latency, and optimized packet data applications.
- LTE-A Long Term Evolution Advanced downlink SU-MIMO (Single User Multi-input Multi-output) can support up to 8 data layers. Parallel transmission.
- the LTE-A downlink will use a DMRS (Demodulation Reference Symbol) based transmission.
- DMRS Demodulation Reference Symbol
- the evolved NodeB In the downlink MIMO transmission process, the evolved NodeB (eNB) allocates a certain number of parallel data streams to each scheduled UE according to factors such as channel conditions, service characteristics and priorities of each UE, and each of the data A stream is called a layer.
- LTE-A In order to support up to 8 layers of spatial multiplexing technology, LTE-A will define 8 ports of DMRS.
- the DMRS uses the same precoding process as the data, and the UE can obtain the equivalent channel matrix after precoding by measuring the DMRS and perform data demodulation.
- LTE-A downlink SU-MIMO can support up to 8 layers, and each layer will correspond to one DMRS port.
- the processing flow of the downlink physical channel is shown in Figure 1.
- each UE's downlink data transmission can support up to 2 codewords, each codeword corresponds to one TB (Transport Block), and each codeword has MCS (Modulation and Coding Scheme,
- the modulation coding mode can be controlled by the eNB according to the link status. The eNB also needs to judge the need according to the spatial characteristics of the channel, as well as the service type, priority, and traffic volume.
- the number of parallel transmission data streams used can support up to 8 layers of transmission in LTE-A.
- the code-to-layer mapping relationship is defined by the Layer Mapper module. At present, the definition of the layer mapper function in spatial multiplexing transmission has been agreed. The specific layer mapper functions are shown in Table 1 and Table 2.
- the precoding module implements precoding based on PMI (Precoding Matrix Indicator).
- PMI Precoding Matrix Indicator
- the role of the precoding module is to map each data layer to a DMRS port.
- the layer-to-port mapping is a simple mapping.
- Rel-9 transmission mode 8 two dedicated pilot ports port 7 and port 8 are defined, and the layer-to-port mapping is defined as
- CDM-FDM Code Division Multiplexing-Frequency Division Multiplexing
- the layer-to-port mapping relationship in LTE-A is complicated. It is necessary to consider not only the allocation of layers corresponding to each codeword in each CDM packet, but also retransmission.
- the relationship between the DMRS pattern and the rate matching module in the process Regarding the layer-to-port mapping problem in LTE-A, the method shown in Figure 3 can be used at present.
- the mapping principle is: Layers corresponding to different codewords must be mapped into different CDM packets.
- the reference symbol port mapping scheme is compatible with existing systems and maintains low demodulation reference symbol overhead.
- an embodiment of the present invention discloses a method for demodulating reference symbol port mapping, which includes the following steps:
- the base station allocates a corresponding data stream to the UE according to an attribute of a user equipment (UE); the base station maps the corresponding data stream from a layer to a corresponding demodulation reference symbol port; and the base station passes the demodulation reference A symbol port transmits the corresponding data stream to the UE.
- UE user equipment
- Another embodiment of the present invention further discloses a base station, including a transceiver module and a mapping module, where:
- the transceiver module is configured to allocate a corresponding data stream to the UE according to an attribute of the UE, where the mapping module is configured to map the corresponding data stream from a layer to a corresponding demodulation reference symbol port; The transceiver module is further configured to send the corresponding data stream to the UE by using the demodulation reference symbol port.
- the above solution proposed by the present invention has little change to the existing system, does not affect the continuous evolution of the system, and is simple and efficient.
- FIG. 4 is a flowchart of a method for mapping a DMRS port according to an embodiment of the present invention
- FIG. 13 is a schematic structural diagram of a base station according to an embodiment of the present invention.
- an embodiment of the present invention discloses a method for demodulating a reference symbol port mapping, including the following steps:
- the base station allocates a corresponding data stream to the UE according to an attribute of the UE; the base station maps the corresponding data stream from a layer to a corresponding demodulation reference symbol port; and the base station uses the demodulation reference symbol port to The corresponding data stream is sent to the UE.
- a flowchart of a method for demodulating reference symbol port mapping includes the following steps:
- the base station determines an attribute of the UE, and allocates a corresponding data stream to the UE.
- step S401 the base station communicates with the UE, and allocates a corresponding data stream to the UE according to the attribute of the UE.
- the e B allocates a certain amount of parallel data streams to each scheduled UE according to factors such as channel conditions, service characteristics, and priorities of each UE, where Each data stream is called a layer.
- 8 ports of DMRS will be defined in LTE-A.
- the DMRS uses the same precoding process as the data, and the UE can obtain the equivalent channel matrix after precoding by measuring the DMRS, and perform data demodulation.
- LTE-A downlink The SU-MO can support up to 8 layers, and each layer will correspond to one DMRS port.
- the processing flow of the downlink physical channel is shown in Figure 1.
- the base station maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port.
- the base station sends data to the UE by demodulating the reference symbol port.
- step S402 the base station maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port.
- the base station maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the corresponding data stream can be mapped to any port and can occupy any CDM packet.
- LTE-A can support MU-MIMO (Multi-User Multi-Input Multi-Output) transmission by using M orthogonal DMRS ports, and then it is retransmitted.
- the data layer can be mapped to any of the ports ⁇ 0,...,M ⁇ for the first transmission, or it can occupy any CDM packet.
- the base station maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the DMRS ports corresponding to the two layers are subordinate to the same CDM packet.
- the codewords corresponding to the two layers need to be retransmitted, the single codeword transmission is used for retransmission.
- the ports occupied by the two layers are subordinate to the same CDM packet.
- the DMRS ports corresponding to the two layers should belong to the same CDM group from the viewpoint of saving overhead and improving data transmission reliability. Which packet is specifically occupied, is notified by the eNB side according to the scheduling decision.
- the codeword needs to be retransmitted and the transport block corresponding to the other outer codeword does not need to be retransmitted.
- single codeword transmission is required.
- the DMRS ports corresponding to the two layers should be subordinate to the same CDM packet. Which packet is specifically occupied, and the eNB side performs notification according to the scheduling decision. The port occupancy during retransmission can be inconsistent with the initial transmission.
- the DMRS overhead is maintained as a 12RE/PRB pair, and this mapping mode is compatible with Rel-9, which facilitates joint scheduling.
- the base station maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the layer corresponding to codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet; when the downlink transmission is When a single codeword is transmitted, the mapping of the layer to the demodulation reference symbol port is consistent with the double codeword transmission.
- the downlink transmission is 3 codeword transmission.
- the base station maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the corresponding layer of codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet.
- Figure 9 A specific example is shown in Figure 9.
- the base station maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the layer corresponding to codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet.
- the base station maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the layer corresponding to codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet.
- the base station maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the layer corresponding to codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet.
- step S403 the base station sends the corresponding data stream to the UE by using the demodulation reference symbol port determined in step S402.
- the method is compatible with existing systems and maintains low demodulation reference symbol overhead.
- the above method proposed by the embodiment of the present invention has little change to the existing system, does not affect the continuous evolution of the system, and is simple and efficient.
- an embodiment of the present invention further discloses a base station 100, including a transceiver module 110 and a mapping module 120.
- the transceiver module 110 is configured to allocate a corresponding data stream to the UE according to an attribute of the UE.
- the corresponding data stream can be mapped to any port and can occupy any CDM packet.
- LTE-A can support MU-MIMO transmission by using M orthogonal DMRS ports, and the data layer can be mapped to ⁇ 0,...,M whether it is retransmission or initial transmission. Any of the ports in ⁇ can also occupy any CDM packet.
- the mapping module 120 maps the corresponding data stream from the layer to the corresponding demodulation reference symbol end port:
- the DMRS ports corresponding to the two layers are subordinate to the same CDM packet.
- the codewords corresponding to the two layers need to be retransmitted, the single codeword transmission is used for retransmission.
- the ports occupied by the two layers are subordinate to the same CDM packet.
- the DMRS ports corresponding to the two layers should belong to the same CDM group from the perspective of saving overhead and improving data transmission reliability. Which packet is specifically occupied, is notified by the eNB side according to the scheduling decision.
- the codeword mapped to layer 2 needs to be retransmitted and the transmission block corresponding to the other outer codeword does not need to be retransmitted.
- Pick Transfer with a single codeword The DMRS ports corresponding to the two layers should be subordinate to the same CDM packet. Which packet is specifically occupied, and the eNB side performs notification according to the scheduling decision. The port occupancy during retransmission can be inconsistent with the initial transmission.
- the DMRS overhead is maintained as a 12RE/PRB pair, and this mapping mode is compatible with Rel-9, which facilitates joint scheduling.
- the mapping module 120 maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the layer corresponding to codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet; when the downlink transmission is When a single codeword is transmitted, the mapping of the layer to the demodulation reference symbol port is consistent with the double codeword transmission.
- the downlink transmission is double codeword transmission.
- the mapping module 120 maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the layer corresponding to codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet.
- the mapping module 120 maps the corresponding data stream from the layer to the corresponding demodulation reference symbol end port:
- the layer corresponding to codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet.
- the mapping module 120 maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the corresponding layer of codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet.
- the mapping module 120 maps the corresponding data stream from the layer to the corresponding demodulation reference symbol port, including:
- the corresponding layer of codeword 1 is mapped to the first demodulation reference symbol CDM packet, and the layer corresponding to codeword 2 is mapped to the second demodulation reference symbol CDM packet.
- the transceiver module 110 is further configured to send the corresponding data stream to the UE through the demodulation reference symbol port determined by the mapping module 120.
- the port port mapping device is defined with a demodulation reference symbol port mapping device when retransmission occurs, so that the demodulation reference symbol port mapping device can be compatible with existing systems and can maintain a low demodulation reference symbol overhead.
- the above-mentioned device proposed by the embodiment of the present invention has little change to the existing system, does not affect the continuous evolution of the system, and is simple and efficient.
- the related hardware may be instructed by a program, which may be stored in a computer readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiments.
- each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
- the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
- the integrated modules, if implemented in the form of software functional modules and sold or used as separate products, may also be stored in a computer readable storage medium.
- the storage shield mentioned above may be a read only memory, a magnetic disk or an optical disk.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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KR1020127022540A KR101427245B1 (ko) | 2010-02-11 | 2011-01-31 | 복조 참조 신호 포트 매핑 방법 및 장치 |
EP11741822.8A EP2536090B1 (en) | 2010-02-11 | 2011-01-31 | Layer-to-DMRS port mapping for MIMO systems with higher ranks |
US13/578,335 US8837371B2 (en) | 2010-02-11 | 2011-01-31 | Method of and apparatus for mapping to demodulation reference signal port |
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CN201010112140XA CN102088429B (zh) | 2010-02-11 | 2010-02-11 | 一种解调参考符号端口映射的方法及设备 |
CN201010112140.X | 2010-02-11 |
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US (1) | US8837371B2 (zh) |
EP (1) | EP2536090B1 (zh) |
KR (1) | KR101427245B1 (zh) |
CN (1) | CN102088429B (zh) |
WO (1) | WO2011097951A1 (zh) |
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- 2011-01-31 US US13/578,335 patent/US8837371B2/en active Active
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CN102088429B (zh) | 2013-09-18 |
EP2536090A1 (en) | 2012-12-19 |
KR20120125321A (ko) | 2012-11-14 |
US8837371B2 (en) | 2014-09-16 |
EP2536090A4 (en) | 2013-08-07 |
US20120300709A1 (en) | 2012-11-29 |
KR101427245B1 (ko) | 2014-09-22 |
EP2536090B1 (en) | 2015-03-11 |
CN102088429A (zh) | 2011-06-08 |
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