WO2011017953A1 - Procédé et dispositif permettant la détermination de position de signal de référence de cellule - Google Patents

Procédé et dispositif permettant la détermination de position de signal de référence de cellule Download PDF

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Publication number
WO2011017953A1
WO2011017953A1 PCT/CN2010/072802 CN2010072802W WO2011017953A1 WO 2011017953 A1 WO2011017953 A1 WO 2011017953A1 CN 2010072802 W CN2010072802 W CN 2010072802W WO 2011017953 A1 WO2011017953 A1 WO 2011017953A1
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Prior art keywords
csi
cell
location
coordinated
cells
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PCT/CN2010/072802
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English (en)
Chinese (zh)
Inventor
戴博
郁光辉
张峻峰
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中兴通讯股份有限公司
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Publication of WO2011017953A1 publication Critical patent/WO2011017953A1/fr

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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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
    • 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
    • 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
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • the present invention relates to Long Term Evolution (LTE) technology, and more particularly to a method and apparatus for determining the location of a cell reference signal.
  • LTE Long Term Evolution
  • Orthogonal Frequency Division Multiplexing (OFDM) technology is essentially a multi-carrier modulation communication technology, and OFDM technology is one of the core technologies in the fourth generation of mobile communication.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the multipath channel of OFDM exhibits frequency selective fading characteristics.
  • the channel is divided into multiple subchannels in the frequency domain, and the spectral characteristics of each subchannel are approximately flat, and each OFDM sub-sub-channel
  • the channels are orthogonal to each other. Therefore, the spectrums of the subchannels are allowed to overlap each other, so that the spectrum resources can be utilized to a large extent.
  • Multi-input and multi-output ( ⁇ ) technology can increase system capacity, improve transmission performance, and integrate well with other physical layer technologies. Therefore, ⁇ technology has become a key technology for B3G and 4G mobile communication systems.
  • the ⁇ precoding method is an efficient ⁇ multiplexing method, which uses the precoding process of the transceiver to convert the ⁇ channel into multiple independent virtual channels, thus ensuring the ⁇ system in various environments. The stability of the energy.
  • FIG. 1 is a schematic diagram of a frame structure of a frequency division duplex (FDD) mode and a time division duplex (TDD) mode of an LTE system.
  • FDD frequency division duplex
  • TDD time division duplex
  • time slots 2i and 2i+l form a subframe (frame) i of length 1 ms; in a frame structure of TDD mode, a 10 ms radio frame (length of 5 frames) is 5 ms long
  • a half frame consists of five subframes (frames) of length 1 ms.
  • the subframe i is defined as two slots 2i and 2i+1 that are 0.5 ms long.
  • one resource element is one subcarrier in one OFDM symbol
  • one downlink resource block ( RB , Resource Block ) consists of 12 consecutive subcarriers and 7 consecutive OFDM symbols (6 in extended cyclic prefix), 180 kHz in the frequency domain, and the length of time in a time slot is a general time slot.
  • the resource block is used as the basic unit for allocation.
  • the LTE system supports 4-antenna MIMO applications.
  • the corresponding antenna port #0, antenna port #1, antenna port #2, and antenna port #3 all use full-bandwidth cell-specific reference signals (CRS).
  • . 3a is a schematic diagram of the location of a cell-specific reference signal in a physical resource block when the cyclic prefix is a regular cyclic prefix in an LTE system, and the locations of the dedicated reference signals in the physical resource block are as shown in FIG. 3a;
  • 3b is a schematic diagram of the location of the cell-specific reference signal in the physical resource block when the cyclic prefix is the extended cyclic prefix in the LTE system, and the location of the dedicated reference signal in the physical resource block is as shown in FIG. 3b.
  • the abscissa represents the time domain and the ordinate represents the frequency domain.
  • UE-specific reference signals which is transmitted only in the time-frequency domain location where the user-specific Physical downlink shared channel (PDSCH) is located.
  • the cell-specific reference signal function includes downlink channel quality measurement and downlink channel estimation (demodulation).
  • LTE-Advanced Further Advancements for E-UTRA is an evolved version of LTE Release-8.
  • 3GPP TR 25.913 "Requirements for In addition to all relevant requirements of Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN), it also meets or exceeds the requirements of IMT-Advanced proposed by ITU-R.
  • the requirements for backward compatibility with LTE Release-8 Means LTE Release-8 terminals can work in LTE-Advanced networks; LTE-Advanced terminals can work in LTE Release-8 networks.
  • LTE-Advanced should be able to operate in different spectrum configurations, including a wider spectrum configuration than LTE Release-8 (eg 100 MHz continuous spectrum resources) to achieve higher performance and target peak rates. Since the LTE-Advanced network needs to be able to access LTE users, its operating band needs to cover the current LTE band, and there is no available 100 MHz of spectrum bandwidth that can be allocated in this band. Therefore, a direct technology that LTE-Advanced needs to solve is to aggregate several consecutive component carrier carriers (spectrals) distributed in different frequency bands to form a 100MHz bandwidth that LTE-Advanced can use. That is, for the aggregated spectrum, it is divided into n component carrier frequencies, and the spectrum in each component carrier frequency is continuous.
  • spectrals component carrier carriers
  • LTE-Advanced downlink can support up to 8 antenna applications; and LTE-Advanced is used as an 8-antenna application and CoMP, Coordinated multiple point transmission and reception, and Beamforming technologies.
  • the basic design framework of the LTE-Advanced downlink reference signal (Way forward) defines the downlink reference signal for LTE-Advanced operation as two types of reference signals: reference signal for PDSCH demodulation and channel-oriented status information (CSI, Channel) Status Information ) The generated reference signal.
  • the CoMP technology is essentially an extension of the multi-antenna technology.
  • the base stations of multiple cells cooperate to transmit data to the target user terminal (UE). Therefore, the target UE needs to know the location of the CSI reference signal (CSI-RS) sent by multiple cells, so that The UE can measure channel state information of multiple cells and report it to the base station, so that the base station can be used for data transmission, thereby implementing CoMP technology.
  • CSI-RS CSI reference signal
  • the main object of the present invention is to provide a method and apparatus for determining the location of a cell reference signal, which can ensure the application of CoMP technology and improve the overall performance goal of the system.
  • a method of determining a location of a cell reference signal comprising:
  • the user equipment UE measures the channel state information of the plurality of cells according to the location of the CSI-RS and reports it to the base station.
  • the cell is a coordinated cell; the location of the reference signal CSI-RS that determines the channel state information of the cell includes:
  • each coordinated cell CSI-RS is determined according to the identity of each coordinated cell.
  • the location sequence number of the CSI-RS that can be used to transmit the different cells is HL, k n , and the location for selecting the CSI-RS of each coordinated cell includes:
  • the m positions of the m cells of the CSI-RS are transmitted as H L , k ; the m locations are consecutive;
  • m is the number of coordinated cells or the multiplexing factor of the coordinated cell CSI-RS, where h is a fixed value or is preset.
  • n represents the number of locations that can currently be used to transmit CSI-RSs of different cells.
  • the location selected for transmitting the coordinated CSI-RS includes:
  • the base station selects a number index to send to the target UE according to the location of the m CSI-RSs; the target UE obtains m location information according to the received number index r and the correspondence between the number index r and the location;
  • n represents the number of locations currently available for transmitting CSI-RSs of different cells
  • m represents the number of coordinated cells.
  • the position sequence numbers of the CSI-RSs currently available for transmitting different cells are HL, k n , and the selected m positions are, L , , where 1 ⁇ ⁇ ", ⁇ +1 ;
  • the m locations of the m cells CSI-RS are transmitted by m signaling, and each signaling represents a CSI-RS location of one cell.
  • Determining the location of the CSI-RS of each coordinated cell includes: determining a location of the CSI-RS of the cell according to the order of the m cell identifiers sent by the base station;
  • Determining the location of the CSI-RS of the cell according to the order of the m cell identifiers sent by the base station includes:
  • the position of the CSI-RS is the gth position among the m positions.
  • the m cells are sorted according to the size of the cell identifier, and determining the location of the CSI-RS according to the sorted location includes: When the location of the certain cell ID in the sorting is g, the location of the CSI-RS corresponding to the cell is the gth location of the m locations.
  • C - ID is a cell identifier
  • m represents a number of coordinated cells or a multiplexing factor of a coordinated cell CSI-RS
  • mod is a remainder operator
  • X is a fixed value, or the value of X is signaled by the base station to the target UE.
  • the method further includes: the base station transmitting, according to the CSI-RS locations of the coordinated cells, the identifiers of the coordinated cells in a corresponding order.
  • An apparatus for determining a location of a cell reference signal comprising: a selecting module and a determining module, wherein: a selecting module, configured to select, from a location of a CSI-RS that can be used to transmit a different cell, a CSI-RS for transmitting each coordinated cell Location
  • a determining module configured to determine a location of each coordinated cell CSI-RS according to an identifier of each coordinated cell.
  • all CSI-RSs in the cell are located on one or two orthogonal frequency division multiplexing OFDM symbols in one subframe;
  • the cell is a single cell or a coordinated cell.
  • the OFDM symbol is one or two OFDM symbols of a second, third, fourth OFDM symbol of a second slot in a subframe;
  • the OFDM symbol is one or two OFDM symbols in the second and third OFDM symbols of the second slot in the subframe.
  • the CSI-RS is transmitted on the same physical subcarrier as the data carried by the physical shared channel sent to the R8 version terminal, only the CSI-RS is sent;
  • the physical shared channel transmitted to the terminal above the R8 version is not in the subcarrier where the CSI-RS is located. Map on.
  • the location of the CSI-RS of the cell is determined, and the UE measures the channel state information of the multiple cells according to the location of the CSI-RS and reports the information to the base station.
  • the location for transmitting the CSI-RS of each coordinated cell is selected from the locations of the CSI-RSs that can be used to transmit the different cells; and the CSI-RS of each coordinated cell is determined according to the identifier of each coordinated cell. position.
  • the target UE clarifies the location of the CSI reference signal sent by multiple cells, so that the UE measures the channel state information of multiple cells and reports it to the base station, so that the base station can be used for data transmission, thereby ensuring CoMP.
  • the application of technology has reached the goal of improving the overall performance of the system.
  • FIG. 1 is a schematic diagram of a frame structure of an FDD mode and a TDD mode of an LTE system
  • FIG. 2 is a schematic structural diagram of a physical resource block when a system bandwidth of the LTE system is 5 MHz;
  • FIG. 3a is a schematic diagram of a location of a cell public reference signal in a physical resource block when a cyclic prefix is a regular cyclic prefix in an LTE system;
  • FIG. 3b is a schematic diagram of a location of a cell public reference signal in a physical resource block when a cyclic prefix is an extended cyclic prefix in an LTE system;
  • FIG. 4 is a flowchart of a method for determining a location of a reference signal of a coordinated cell according to the present invention
  • FIG. 5 is a schematic structural diagram of a device for determining a location of a reference signal of a coordinated cell according to the present invention.
  • the location of a reference signal (CSI-RS) of channel state information of a cell is determined, and the UE measures a plurality of cell channel state information according to the location of the CSI-RS and uplinks it to the base station.
  • the cell is a coordinated cell, and may be a coordinated cell including a primary cell and a primary cell, or may be a coordinated cell that does not include a primary cell but only a primary cell.
  • FIG. 4 is a flowchart of a method for determining a location of a reference signal of a coordinated cell according to the present invention, as shown in FIG. Show, including:
  • Step 400 Select a location for transmitting each coordinated cell CSI-RS from a location that can be used as a CSI-RS for transmitting different cells.
  • the location order numbers of the CSI-RSs currently available for transmitting different cells are kl, k2, ⁇ , kn, and the cell IDs associated with the CoMP set are ID1, ID2, ⁇ , IDm, where m, n Is an integer.
  • m represents the number of coordinated cells or the multiplexing factor of the coordinated cell CSI-RS.
  • the location for selecting the CSI-RS of each coordinated cell is specifically as follows:
  • One implementation method is: transmitting m locations of the C cells of the m cells as ' L , d, and the m locations are consecutive m Location.
  • h is a fixed value, such as 0 or (nm), etc.; or, h is preset, and the value is notified by the base station to the target UE by signaling.
  • Another implementation method is: numbering a combination of m locations for all n locations, ensuring that any m locations are uniquely corresponding to a number index, and the base station selects a number index according to the location of the m cells CSI-RS.
  • the selected m positions are , , L , , 1 ⁇ ⁇ ", ⁇ +1 , then, the number index r is as shown in equation (1):
  • a combination number G representing y values among X different values
  • the number index of m positions of the m cell CSI-RSs transmitted by the base station is signaled to the UE by the base station.
  • m positions of m cells CSI-RS are transmitted by m signaling, and each signaling represents one The CSI-RS location of the cell.
  • Step 401 Determine, according to the identifier of each coordinated cell, the location of each coordinated cell CSI-RS. There are two ways to implement this step:
  • the first method determines the location of the cell CSI-RS according to the order of the m cell identifiers sent by the base station, that is, the order of the m cell identifiers received by the UE. For example, the order in which the cell IDi is transmitted in the m cell identifiers is g, and the location of the corresponding CSI-RS is the gth position in the m locations.
  • the base station (eNB) needs to send m cell identifiers according to the CSI-RS locations of the m cells according to the corresponding order;
  • the m cells are sorted according to the size of the cell identifier, and the location of the cell CSI-RS is determined according to the sorted position. For example, the location of the cell IDi in the above sorting is g, and then the location of the corresponding CSI-RS is the gth position among the m locations.
  • the present invention also provides a method of determining a cell reference signal. First, from among the locations that can be used to transmit CSI-RSs of different cells, the location for transmitting each of the cooperative cell CSI-RSs is selected.
  • ⁇ the current location of the CSI-RS that can be used to transmit different cells is kl, k2, ⁇ ., kn, and the cell IDs associated with the CoMP set are IDI, ID2, ⁇ . , IDm, where m, n It is an integer; the cell identifier is CeZZ - ) , and its corresponding CSI-RS position is - ° , where mod is the remainder operator; X is a fixed value, such as 0; or, the value of X is passed by the base station. Let the target UE be notified.
  • All CSI-RSs of a cell are located on one or two OFDM symbols in one subframe.
  • a cell refers to a single cell or a coordinated cell.
  • the OFDM symbol is one or two OFDM symbols of the second, third, and fourth OFDM symbols of the second slot in the subframe;
  • the OFDM symbol is the second time slot in the subframe.
  • the data carried by the physical shared channel of the R8 version terminal is transmitted on the same physical subcarrier as the CSI-RS, only the CSI-RS is sent, and the data carried by the physical shared channel is not transmitted;
  • the physical shared channel transmitted to the terminal above the R8 version is not mapped on the subcarrier where the CSI-RS is located.
  • the location of the cell reference signal is clarified, thereby ensuring the application of the CoMP technology and achieving the goal of improving the overall performance of the system.
  • FIG. 5 is a schematic structural diagram of a device for determining a reference signal of a coordinated cell according to the present invention. As shown in FIG. 5, the method includes a selection module and a determining module, where
  • a selection module configured to select a location for transmitting each coordinated cell CSI-RS from a location that can be used to transmit CSI-RSs of different cells.
  • a determining module configured to determine a location of each coordinated cell CSI-RS according to an identifier of each coordinated cell.
  • the CSI-RS locations currently available for transmitting different cells are k1, k2, ⁇ , kn, and the cell identifiers associated with the CoMP set are ID1, ID2, ⁇ , IDm, (m ⁇ n, and, ID1 ⁇ ID2 ⁇ -.. ⁇ IDm), then, the CSI-RS position of the cell IDi is k (h+i), where
  • h is a fixed value, such as 0 or nm, etc.; or, the value of h is notified to the target UE by the base station by signaling.
  • the cell identifiers associated with the CoMP set are ID1, ID2, . . . , IDm
  • the CSI-RS locations currently available for transmitting different cells are kl, k2, ⁇ ⁇ , kn
  • the CSI-RS position of the cell IDi is k (h+i), where Ki ⁇ m, h, m, n are integers.
  • h is a fixed value, such as 0 or n-m, etc.; or, the value of h is notified by the base station to the target UE through a signaling.
  • the base station (eNB) needs to transmit m cell identifiers according to the CSI-RS locations of the m cells in the corresponding order.
  • the number index m is decoded as follows:
  • the input parameter is r
  • the output parameter after decoding is k Si , L , k Sm ;
  • the combination of m positions is selected for all n positions to ensure that any m positions are uniquely corresponding to a number index r.
  • the base station selects a number index r to send to the target UE.
  • the target UE obtains m pieces of position information according to the received number index r and the correspondence between the number index r and the position.
  • the UE determines the location of the cell CSI-RS according to the order of the received m cell identifiers. That is, if the cell IDi is transmitted in the order of m cell identifiers, then the location of the corresponding CSI-RS is the g-th position of the m locations.
  • the base station (eNB) needs to send m cell identifiers according to the CSI-RS locations of the m cells according to the corresponding order;
  • the cell identifiers associated with the CoMP set are IDI, ID2, ⁇ ., IDm, and the CSI-RS locations currently available for transmitting different cells are kl, k2, ⁇ ., kn, then, the cell IDi
  • the CSI-RS position is i+; c ) m . Dm ) (Ki ⁇ m), x, m, n are integers. Where x is a fixed value, such as 0 or nm, etc.; or, the value of X is signaled by the base station.

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  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif permettant la détermination de position de signal de référence de cellule. La position utilisée pour transmettre un signal de référence d'information de statut de canal (CSI-RS) de chaque cellule coordonnée est sélectionnée parmi les positions disponibles pour transmettre les signaux CSI-RS des différentes cellules, et la position du signal CSI-RS de chaque cellule coordonnée est déterminée selon l'identifiant de chaque cellule coordonnée. Grâce au procédé selon la présente invention, un équipement utilisateur cible détermine les positions pour la transmission des signaux CSI-RS dans une pluralité de cellules, permettant ainsi de réaliser l'objectif de la mesure par l'équipement utilisateur de l'information CSI d'une pluralité de cellules et de son rapport à une station de base de sorte que la station de base puisse l'utiliser pour la transmission de données, assurant ainsi l'application de transmission et de réception de points multiples coordonnés et la réalisation de l'objectif d'améliorer la performance globale du système.
PCT/CN2010/072802 2009-08-14 2010-05-14 Procédé et dispositif permettant la détermination de position de signal de référence de cellule WO2011017953A1 (fr)

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CN200910162634.6A CN101635950B (zh) 2009-08-14 2009-08-14 一种确定小区参考信号位置的方法及装置

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