WO2011124097A1 - Procédé et station de base pour mappage de pilote de mesure de canal - Google Patents

Procédé et station de base pour mappage de pilote de mesure de canal Download PDF

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Publication number
WO2011124097A1
WO2011124097A1 PCT/CN2011/070447 CN2011070447W WO2011124097A1 WO 2011124097 A1 WO2011124097 A1 WO 2011124097A1 CN 2011070447 W CN2011070447 W CN 2011070447W WO 2011124097 A1 WO2011124097 A1 WO 2011124097A1
Authority
WO
WIPO (PCT)
Prior art keywords
csi
subcarriers
ofdm symbols
cell
base station
Prior art date
Application number
PCT/CN2011/070447
Other languages
English (en)
Chinese (zh)
Inventor
姜静
张文峰
孙云锋
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2011124097A1 publication Critical patent/WO2011124097A1/fr

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Classifications

    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the present invention relates to communication technologies, and in particular, to a channel measurement pilot (CSI-RS) mapping method and a base station.
  • CSI-RS channel measurement pilot
  • LTE-Advance Long-Term Evolution advance
  • IMT-Advance International Mobile Telecommunication advance
  • LTE-Advance Long-Term Evolution-Advance
  • CMP Coordinate Multipoint Transmission and Reception
  • DMRS Demodulation Pilot
  • FIG. 1 is a schematic diagram of a base station transmitting a channel measurement pilot to a terminal
  • FIG. 2 is a schematic flowchart of a method for transmitting a channel measurement pilot.
  • the CSI-RS is sent by the base station according to the number of antenna ports of the cell.
  • the CSI-RS measures the channel rank (RI), channel quality information (CQI), and precoding matrix index (PMI) of the channel after receiving the CSI-RS.
  • RI channel rank
  • CQI channel quality information
  • PMI precoding matrix index
  • the main objective of the present invention is to provide a channel measurement pilot mapping method and
  • the base station can apply CSI-RS in LTE-Advanced to improve channel measurement performance and system throughput, and has low design overhead.
  • a channel measurement pilot mapping method includes: a channel measurement pilot CSI-RS mapping of each cell is composed of one mapping unit, and CSI-RS time-frequency positions of each cell are orthogonal.
  • the mapping unit relates to one orthogonal frequency division multiplexing OFDM symbol, or two OFDM symbols, or four OFDM symbols.
  • the CSI-RS occupies two consecutive subcarriers after contiguously occupying two subcarriers in the OFDM symbol, and then continues to occupy two consecutive subcarriers.
  • the CSI-RS occupies at least one subcarrier after occupying four subcarriers in the OFDM symbol and continues to occupy another four consecutive subcarriers.
  • the CSI-RS contiguously occupies eight subcarriers in the OFDM symbol.
  • mapping unit involves two OFDM symbols
  • the two OFDM symbols are adjacent, and two antenna ports on the same subcarrier of the two OFDM symbols are code division multiplexed
  • the CSI-RS occupies four subcarriers in one OFDM symbol, and each of the four subcarriers is arranged adjacent to each other or at least one subcarrier spacing every two subcarriers.
  • mapping unit involves four OFDM symbols
  • two adjacent OFDM symbols are spaced apart by several OFDM symbols and then two other adjacent OFDM symbols are arranged, and each two adjacent OFDM symbols are on the same subcarrier.
  • a CSI-RS occupies two subcarriers on one OFDM symbol and occupies the same or different subcarriers on non-adjacent OFDM symbols.
  • a base station is configured to map a CSI-RS of a cell to a mapping unit, and orthogonalize CSI-RS time-frequency positions of each cell.
  • the base station mapping the CSI-RS of the cell to a mapping unit is: The base station maps the CSI-RS of the cell to a mapping unit involving one OFDM symbol, or two OFDM symbols, or four OFDM symbols.
  • the mapping, by the base station, the CSI-RS of the cell to the mapping unit related to one OFDM symbol is: the CSI-RS continuously occupies two subcarriers in the OFDM symbol, and then continues to occupy two consecutive subcarriers after being separated by one subcarrier.
  • the CSI-RS occupies at least one subcarrier after occupying four subcarriers in the OFDM symbol and continues to occupy another four consecutive subcarriers.
  • the CSI-RS contiguously occupies eight subcarriers in the OFDM symbol.
  • the mapping, by the base station, the CSI-RS of the cell to the mapping unit of the two OFDM symbols is: the two OFDM symbols are adjacent, and the two antenna ports on the same subcarrier of the two OFDM symbols perform CDM;
  • the CSI-RS occupies four subcarriers in one OFDM symbol, and each of the four subcarriers is arranged adjacent to each other or at least one subcarrier spacing every two subcarriers.
  • the base station maps a CSI-RS of a cell to a mapping unit involving four OFDM symbols: two adjacent OFDM symbols are spaced apart by several OFDM symbols, and then two other adjacent OFDM symbols are arranged, and each two phases The adjacent OFDM symbols perform CDM on two antenna ports on the same subcarrier;
  • a CSI-RS occupies two subcarriers on one OFDM symbol and occupies the same or different subcarriers on non-adjacent OFDM symbols.
  • the channel measurement pilot mapping method and the base station of the present invention avoid the orthogonal frequency division multiplexing (OFDM) symbols occupied by the common pilot (CRS) and the resource elements (RE) occupied by the demodulation pilot (DMRS),
  • OFDM orthogonal frequency division multiplexing
  • CRS common pilot
  • RE resource elements
  • DMRS demodulation pilot
  • the present invention can apply the CSI-RS in the LTE-Advanced, Therefore, the channel measurement performance and the system throughput are improved, and the CSI-RS time-frequency positions of the cells in the present invention are orthogonal, that is, inter-cell multiplexing can be realized, and therefore, the design cost of the present invention is low.
  • 1 is a schematic diagram of a base station transmitting a channel measurement pilot to a terminal
  • FIG. 2 is a schematic flow chart of a method for transmitting a channel measurement pilot
  • 3 is a schematic diagram of pilots already defined in Release 9 of the LTE system
  • FIG. 4 is a schematic diagram of three embodiments of a first channel measurement pilot mapping method according to the present invention
  • FIG. 5 is a schematic diagram of two embodiments of a second channel measurement pilot mapping method according to the present invention
  • FIG. 7 is a schematic diagram of a pattern of repeatedly transmitting a CSI-RS in a certain period according to Embodiment 1 of the present invention
  • FIG. 8 is a schematic diagram of a pattern of repeatedly transmitting a CSI-RS in a certain period according to Embodiment 2 of the present invention.
  • FIG. 9 is a schematic diagram of a pattern for repeatedly transmitting a CSI-RS in a certain period according to Embodiment 3 of the present invention. detailed description
  • the basic idea of the present invention is: avoiding orthogonal frequency division multiplexing (OFDM) symbols occupied by common pilot (CRS), and resource elements (RE) occupied by demodulation pilots (DMRS), by occupying at least one
  • OFDM orthogonal frequency division multiplexing
  • CRS common pilot
  • RE resource elements
  • DMRS demodulation pilots
  • the pilots already defined in Release 9 of the LTE system are shown in FIG. 3.
  • the CSI-RS should circumvent the Common Pilot (CRS), Release 9/10 Demodulation Pilot (DMRS).
  • CRS Common Pilot
  • DMRS Demodulation Pilot
  • the channel measurement pilot mapping method proposed by the present invention is as follows:
  • the channel measurement pilot CSI-RS mapping of each cell is composed of one mapping unit, and the CSI-RS time-frequency positions of each cell are orthogonal.
  • mapping unit 1 may relate to one orthogonal frequency division multiplexing OFDM symbol, or two OFDM symbols, or four OFDM symbols, hereinafter referred to as mapping unit 1, mapping unit 2, mapping unit 3, respectively, and the following three mappings
  • mapping unit 1 mapping unit 2
  • mapping unit 3 mapping unit 3
  • Mapping unit 1 involves one OFDM symbol, that is, the CSI-RS of the cell is mapped on one OFDM symbol. Specifically, the eight antenna ports of the CSI-RS of the transmitting cell are on one OFDM symbol, and each antenna port is frequency-multiplexed.
  • FDM the three implementations of the mapping unit 1 are as shown in FIG. 4, as shown in FIG. 4, it can be seen that the CSI-RS of the cell can be used in one OFDM symbol, and each subcarrier is occupied by two subcarriers, and then one subframe is further occupied. Two consecutive subcarriers are mapped (for example, the case shown in Embodiment 4A in FIG.
  • Mapping unit 2 involves two OFDM symbols. Specifically, the CSI-RS of the cell is distributed on two adjacent OFDM symbols, and the two adjacent OFDM symbols are two antenna ports on the same subcarrier, CDM, 8 antennas.
  • the CSI-RS of the port occupies four subcarriers on one OFDM symbol, and the two implementations of the mapping unit 2 are as shown in FIG. 5. Specifically, each of the four subcarriers is adjacently arranged (for example, FIG. 5 In the case shown in Embodiment 5A) or at least one subcarrier arrangement every two subcarriers (for example, the case shown in Embodiment 5B in FIG. 5).
  • Mapping unit 3 involves four OFDM symbols, that is, a CSI-RS of a cell is distributed over four OFDM symbols, wherein two adjacent OFDM symbols are spaced apart by several OFDM symbols and then two other adjacent OFDM symbols are arranged. And every two adjacent OFDM symbols are on the same subcarrier
  • the two antenna ports are code diversity multiplex (CDM), and the CSI-RS of the 8 antenna port occupies two subcarriers on one OFDM symbol.
  • CDM code diversity multiplex
  • the three implementations of the mapping unit 3 are as shown in FIG. 6. Specifically, the CSI-RS of the cell may occupy the same subcarrier on the non-adjacent OFDM symbols (for example, the case shown in Embodiment 6A in FIG. 6).
  • Different subcarriers may also be occupied, such as subcarriers occupied on non-adjacent OFDM symbols differ by one subcarrier and two subcarriers respectively (for example, the case shown in Embodiment 6B or Embodiment 6C in FIG. 6).
  • the number of symbols of the third unit interval can be flexibly changed, and each mapping unit can perform frequency domain shifting, but each unit CSI-RS occupies the RE separated subcarriers.
  • the CSI-RS time-frequency positions of the cells in the COMP measurement set are orthogonal, that is, different cells use different mapping methods, or use the same mapping method but are located in different sub-carriers or different OFDM symbols. on.
  • the CSI-RS can support a maximum orthogonal multiplexing factor of 7 in a resource fast (RB).
  • RB resource fast
  • the CSI-RS can support an orthogonal multiplexing factor of 6 in one RB for easy planning of the cell ID.
  • an average of one resource element is transmitted on each resource block of each antenna port to transmit a channel measurement pilot (CSI-RS), and the CSI-RS occupies one, or two, or four in each transmission period. , or six, or seven OFDM symbols.
  • CSI-RS channel measurement pilot
  • the base station side when the base station side transmits the CSI-RS in each antenna port, it may transmit in a time division multiplexing (TDM) orthogonal manner, or may use frequency division multiplexing (FDM). It can be sent in the form of handover, or it can be transmitted in the orthogonal manner of TDM+FDM, so that CSI-RS transmitted by multiple antenna ports can be prevented from interfering with each other.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • the present invention also correspondingly discloses a base station for mapping a CSI-RS of a cell to a mapping unit and orthogonalizing the CSI-RS time-frequency positions of the cells.
  • the base station mapping the CSI-RS of the cell to a mapping unit is: the base station maps the CSI-RS of the cell to involve one OFDM symbol, or two OFDM symbols, or four OFDM The mapping unit of the symbol.
  • the mapping, by the base station, the CSI-RS of the cell to the mapping unit related to one OFDM symbol is: the CSI-RS continuously occupies two subcarriers in the OFDM symbol, and then continues to occupy two consecutive subcarriers after being separated by one subcarrier.
  • the CSI-RS occupies at least one subcarrier after occupying four subcarriers in the OFDM symbol and continues to occupy another four consecutive subcarriers.
  • the CSI-RS contiguously occupies eight subcarriers in the OFDM symbol.
  • the mapping, by the base station, the CSI-RS of the cell to the mapping unit of the two OFDM symbols is: the two OFDM symbols are adjacent, and the two antenna ports on the same subcarrier of the two OFDM symbols perform CDM;
  • the CSI-RS occupies four subcarriers in one OFDM symbol, and each of the four subcarriers is arranged adjacent to each other or at least one subcarrier spacing every two subcarriers.
  • the base station maps a CSI-RS of a cell to a mapping unit involving four OFDM symbols: two adjacent OFDM symbols are spaced apart by several OFDM symbols, and then two other adjacent OFDM symbols are arranged, and each two phases The adjacent OFDM symbols perform CDM on two antenna ports on the same subcarrier;
  • a CSI-RS occupies two subcarriers on one OFDM symbol and occupies the same or different subcarriers on non-adjacent OFDM symbols.
  • FIG. 7 is a schematic diagram of a pattern of repeatedly transmitting a CSI-RS in a certain period according to the first embodiment of the present invention.
  • the CSI-RS in each period occupies one subframe to complete transmission, as shown in FIG. 7, the cell 71, the cell 73, and the cell 76.
  • the CSI-RS is transmitted by using the scheme shown in Embodiment 6C of FIG. 6.
  • the cell 72, the cell 74, and the cell 75 transmit the CSI-RS by using the scheme shown in Embodiment 6B of FIG. 6.
  • the multiplexing factor that a CSI-RS can support in one RB is 6.
  • Embodiment 2 Embodiment 2
  • FIG. 8 is a schematic diagram of a pattern of repeatedly transmitting a CSI-RS in a certain period according to the second embodiment of the present invention.
  • the CSI-RS in each period occupies one subframe to complete transmission.
  • the cell 81 is used in FIG.
  • the scheme shown in Embodiment 4A transmits a CSI-RS, and the cell 82, the cell 83, the cell 84, the cell 85, and the cell 86 transmit the CSI-RS by using the scheme shown in Embodiment 5A of FIG.
  • the CSI-RS can support a multiplexing factor of 6 within one RB.
  • Embodiment 3 Embodiment 3
  • FIG. 9 is a schematic diagram of a pattern of repeatedly transmitting a CSI-RS in a certain period according to Embodiment 3 of the present invention.
  • the CSI-RS in each period occupies one subframe to complete transmission, as shown in FIG. 9, the cell 91, the cell 93, and the cell 94.
  • the CSI-RS is transmitted by using the scheme shown in Embodiment 6A of FIG. 6.
  • the cell 92, the cell 95, and the cell 96 transmit the CSI-RS by using the scheme shown in Embodiment 4A of FIG. 4, in this embodiment,
  • the multiplexing factor that a CSI-RS can support in one RB is 6.
  • the mapping method of designing channel measurement pilots on the base station side can support orthogonal design of multiple cells (meaning that the time-frequency positions of CSI-RS transmissions in each cell in the COMP measurement set are completely different), and the correlation is solved.
  • the technology does not define how to transmit channel measurement pilots, and provides the pilot information required for high-order MIMO and COMP, which is beneficial for LTE-Advanced users to improve single-link quality.
  • the channel measurement pilot occupies only one resource element on average per resource block, the transmission of the sparse channel measurement pilot can be implemented, thereby reducing the performance degradation of the LTE user and ensuring the channel measurement. Performance, improve system throughput.

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

Abstract

L'invention porte sur un procédé de mappage de pilote de mesure de canal. Un mappage de signal de référence d'informations d'état de canal (CSI-RS) de toutes les cellules est constitué d'une unité de mappage, et les positions temps-fréquence du CSI-RS de chaque cellule sont orthogonales, l'unité de mappage comprenant un symbole de multiplexage par répartition orthogonale de la fréquence (OFDM), deux symboles OFDM ou quatre symboles OFDM. L'invention porte également sur une station de base. Avec l'invention, le CSI-RS de la cellule est transmis par la sous-porteuse attribuée dans au moins un symbole OFDM. De cette manière, l'invention est capable d'appliquer le CSI-RS au système d'évolution à long terme avancé (LTE-avancé), ce qui permet d'améliorer les performances de mesure de canal et le débit du système. En outre, les positions temps-fréquence des CSI-RS de toutes les cellules sont orthogonales dans l'invention, ce qui permet de réaliser un multiplexage parmi les cellules. En conséquence, le coût de conception de l'invention est bas.
PCT/CN2011/070447 2010-04-07 2011-01-20 Procédé et station de base pour mappage de pilote de mesure de canal WO2011124097A1 (fr)

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Application Number Priority Date Filing Date Title
CN2010101430530A CN102215197A (zh) 2010-04-07 2010-04-07 一种信道测量导频映射方法及基站
CN201010143053.0 2010-04-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104869649A (zh) * 2015-06-16 2015-08-26 江苏省邮电规划设计院有限责任公司 一种lte系统中多点协作传输多小区测量导频配置方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104038320B (zh) * 2013-03-04 2019-03-01 中兴通讯股份有限公司 资源映射、接收方法及装置、信令通知、获取方法及装置

Citations (3)

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EP1890397A1 (fr) * 2006-08-18 2008-02-20 NTT DoCoMo Inc. Emetteur/récepteur pour communiquer avec un émetteur/récepteur distant en utilisant des codes de phases spatiaux
CN101541085A (zh) * 2009-04-27 2009-09-23 中兴通讯股份有限公司 一种测量参考信号的发送及使用方法
CN101594335A (zh) * 2009-06-19 2009-12-02 中兴通讯股份有限公司 参考信号和物理资源块的映射方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1890397A1 (fr) * 2006-08-18 2008-02-20 NTT DoCoMo Inc. Emetteur/récepteur pour communiquer avec un émetteur/récepteur distant en utilisant des codes de phases spatiaux
CN101541085A (zh) * 2009-04-27 2009-09-23 中兴通讯股份有限公司 一种测量参考信号的发送及使用方法
CN101594335A (zh) * 2009-06-19 2009-12-02 中兴通讯股份有限公司 参考信号和物理资源块的映射方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104869649A (zh) * 2015-06-16 2015-08-26 江苏省邮电规划设计院有限责任公司 一种lte系统中多点协作传输多小区测量导频配置方法
CN104869649B (zh) * 2015-06-16 2018-02-13 江苏省邮电规划设计院有限责任公司 一种lte系统中多点协作传输多小区测量导频配置方法

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