WO2011078571A2 - 프리코딩된 사운딩 참조신호를 이용하여 comp 통신을 수행하는 장치 및 그 방법 - Google Patents
프리코딩된 사운딩 참조신호를 이용하여 comp 통신을 수행하는 장치 및 그 방법 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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- 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
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H04W88/08—Access point devices
Definitions
- the present invention relates to a wireless communication system, and more particularly, to an apparatus and method for performing CoMP communication using a precoded sounding reference signal.
- Coordinated Multi-Point (CoMP) systems are systems for improving throughput of users at cell boundaries by applying improved MIMO transmission in a multi-cell environment.
- Application of the CoMP system can reduce inter-cell interference in a multi-cell environment.
- the terminal can be jointly supported data from the multi-cell base station (Multi-cell base-station).
- each base station can improve the performance of the system by simultaneously supporting one or more terminals (UE 1, UE 2, ... UE K) by using the same radio frequency resource (Same Radio Frequency Resource).
- the base station may perform a space division multiple access (SDMA) method based on channel state information (CSI) between the base station and the terminal.
- SDMA space division multiple access
- the CoMP scheme can be divided into Co-MIMO (JP) Joint Processing (Co-MIMO) and Cooperative Scheduling Scheme / Beamforming Scheme (CS / CB) through data sharing. .
- JP Co-MIMO
- Co-MIMO Joint Processing
- CS / CB Cooperative Scheduling Scheme / Beamforming Scheme
- the 3GPP LTE-A which is the next generation communication system, is planning to introduce a CoMP system, but has not yet provided a specific method for inter-cell interference cooperation between multiple cells.
- An object of the present invention is to provide a method for performing CoMP (Coordinated Multiple Point) communication using a precoded sounding reference signal.
- Another object of the present invention is to provide an apparatus for performing CoMP (Coordinated Multiple Point) communication using a precoded sounding reference signal.
- CoMP Coordinated Multiple Point
- the method may further include obtaining CoMP scheduling information of the terminal from the received SRS, wherein the determining of the precoding matrix is performed by one or more servings of the base station overlapped with time or frequency resources scheduled by the terminal.
- a precoding matrix to be transmitted to the terminal can be determined.
- the determined precoding matrix may be determined as a matrix existing in a null space of the effective adjacent channel matrix.
- the first matrix ( ) Is a precoding matrix determined by the serving base station ( Corresponds to a precoding matrix determined by the UE to be applied to the SRS, and the effective neighbor channel matrix is a hermition matrix of the first matrix. ), And a downlink channel matrix between the terminal and the base station Can be expressed as a product of
- the SRS may be transmitted through a previously reserved time or frequency resource.
- a method of performing CoMP (Coordinated Multiple Point) communication using a precoded sounding reference signal includes a sounding reference signal in which a terminal is not precoded. Transmitting the SRS to the serving base station; Receiving from the serving base station a precoding matrix used by the serving base station for data transmission to the terminal; And determining a reception matrix based on the received precoding matrix, and precoding the hermition matrix of the determined reception matrix into an SRS and transmitting the received matrix to an adjacent base station.
- CoMP Coordinatd Multiple Point
- the method may further include receiving SRS configuration information of the terminal from the serving base station.
- the terminal transmits the SRS based on the received SRS configuration information.
- the precoding matrix determined by the serving base station may be determined based on a downlink channel estimation between the terminal and the base station by using the sounding reference signal received by the serving base station from the terminal.
- a base station apparatus for performing CoMP (Coordinated Multiple Point) communication using a precoded sounding reference signal may include a first matrix (1) from a terminal of an adjacent cell.
- the matrix is a matrix indicating the direction in which the terminal should face the reception beam for receiving data from the serving base station of the terminal.
- the processor further obtains CoMP scheduling information of the terminal from the received SRS, and is free to transmit to one or more terminals served from the base station overlapped with time or frequency resources scheduled in the terminal based on the obtained scheduling information.
- the coding matrix can be determined.
- the precoding matrix determined by the processor may be a matrix existing in a null space of the effective adjacent channel matrix.
- a terminal device performing CoMP (Coordinated Multiple Point) communication using a precoded sounding reference signal may include a sounding reference signal (SRS) that is not precoded.
- a processor configured to determine a reception matrix based on the received precoding matrix, and to precode a hermition matrix of the determined reception matrix into an SRS; And a transmitter for transmitting the precoded SRS to an adjacent base station.
- the terminal apparatus further includes a receiver for receiving SRS configuration information of the terminal from the serving base station, wherein the transmitter for transmitting the SRS transmits the SRS based on the received SRS configuration information.
- communication performance of a terminal may be significantly improved by removing and mitigating intercell interference on a terminal located at a cell boundary.
- the present invention by controlling the inter-cell interference based on the SRS signal transmission of the terminal, it is possible to solve the problem that communication performance is degraded due to the delay caused by excessive information sharing through the backhaul link.
- FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100 according to the present invention
- FIG. 2 is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a mobile communication system
- 3 is a diagram illustrating the structure of a downlink and uplink subframe in a 3GPP LTE system as an example of a mobile communication system;
- MIMO general multiple antenna
- FIG. 7 illustrates a reference signal pattern in a 3GPP LTE system as an example of a mobile communication system
- FIG. 8 illustrates an example of an uplink subframe configuration including an SRS symbol
- FIG. 11 is a view illustrating a concept of a cooperative operation of a CoMP cooperative base station
- FIG. 12 illustrates an example of a procedure for a downlink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation
- FIG. 13 illustrates an example of a procedure for a downlink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation
- FIG. 14 illustrates an example of a procedure for an uplink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation
- 15 illustrates another example of a procedure for a downlink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation
- FIG. 16 is a diagram illustrating another example of a procedure for uplink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation.
- a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and the like.
- the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
- UE user equipment
- MS mobile station
- AMS advanced mobile station
- AP Access Point
- a user equipment / relay node may receive information from a base station through downlink / backhaul downlink, and the terminal / relay may also be uplink / backhaul uplink.
- Information can be transmitted via.
- the information transmitted or received by the terminal and the repeater includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal and the repeater.
- the wireless communication system 200 may include one or more base stations and / or one or more terminals.
- the base station 105 includes various types of base stations, such as a macro base station, a femto base station, and the like
- the terminal 110 includes various types of terminals, such as a macro terminal and a femto terminal.
- the base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, and a receiver ( 190, a symbol demodulator 195, and a receive data processor 297.
- the terminal 110 transmits (Tx) the data processor 165, the symbol modulator 170, the transmitter 175, the transmit / receive antenna 135, the processor 155, the memory 160, the receiver 140, and the symbol. It may include a demodulator 155 and a receive data processor 150.
- the base station 105 and the terminal 110 are provided with a plurality of antennas. Accordingly, the base station 105 and the terminal 110 according to the present invention support a multiple input multiple output (MIMO) system.
- the base station 105 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi user-MIMO (MU-MIMO) scheme.
- SU-MIMO single user-MIMO
- MU-MIMO multi user-MIMO
- the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols ("data"). Symbols ").
- the symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
- the symbol modulator 120 multiplexes the data and pilot symbols and sends it to the transmitter 125.
- each transmission symbol may be a data symbol, a pilot symbol, or a null signal value.
- pilot symbols may be sent continuously.
- the pilot symbols may be frequency division multiplexing (FDM), orthogonal frequency division multiplexing (OFDM), time division multiplexing (TDM), or code division multiplexing (CDM) symbols.
- Transmitter 125 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency upconverts) the analog signals to provide a wireless channel. Generates a downlink signal suitable for transmission through the downlink signal, which is then transmitted to the terminal through the antenna 130.
- the antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140.
- Receiver 140 adjusts (eg, filters, amplifies, and frequency downconverts) the received signal, and digitizes the adjusted signal to obtain samples.
- the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
- the symbol demodulator 145 also receives a frequency response estimate for the downlink from the processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols). Obtain and provide data symbol estimates to a receive (Rx) data processor 150. Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
- the processing by symbol demodulator 145 and receiving data processor 150 is complementary to the processing by symbol modulator 120 and transmitting data processor 115 at base station 105, respectively.
- the terminal 110 is on the uplink, and the transmit data processor 165 processes the traffic data to provide data symbols.
- the symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175.
- the transmitter 175 receives and processes a stream of symbols to generate an uplink signal, which is transmitted to the base station 105 via the antenna 135.
- an uplink signal is received from the terminal 110 through the antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
- the symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
- the received data processor 297 processes the data symbol estimates to recover the traffic data transmitted from the terminal 110.
- Processors 155 and 180 of the terminal 110 and the base station 105 respectively instruct (eg, control, coordinate, manage, etc.) operations at the terminal 110 and the base station 105, respectively.
- Respective processors 155 and 180 may be connected to memory units 160 and 185 that store program codes and data.
- the memory 160, 185 is coupled to the processor 180 to store the operating system, applications, and general files.
- the processors 155 and 180 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like.
- the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs Field programmable gate arrays
- the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention.
- the firmware or software configured to be may be provided in the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processors 155 and 180.
- the layers of the air interface protocol between the terminal and the base station between the wireless communication system (network) are based on the first three layers (L1), the second layer (based on the lower three layers of the open system interconnection (OSI) model well known in the communication system). L2), and the third layer L3.
- the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
- a Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
- the terminal and the base station may exchange RRC messages through the wireless communication network and the RRC layer.
- FIG. 2 is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a mobile communication system.
- one radio frame has a length of 10 ms (327200 Ts) and consists of 10 equally sized subframes.
- Each subframe has a length of 1 ms and consists of two slots.
- Each slot has a length of 0.5 ms (15360 Ts).
- the slot includes a plurality of OFDM symbols or SC-FDMA symbols in the time domain and a plurality of resource blocks in the frequency domain.
- one resource block includes 12 subcarriers x 7 (6) OFDM symbols or a single carrier-frequency division multiple access (SC-FDMA) symbol.
- Transmission time interval (TTI) which is a unit time for transmitting data, may be determined in units of one or more subframes.
- the structure of the above-described radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe, the number of OFDM symbols or SC-FDMA symbols included in the slot may be variously changed. have.
- 3 is a diagram illustrating a structure of downlink and uplink subframes of a 3GPP LTE system as an example of a mobile communication system.
- one downlink subframe includes two slots in the time domain. Up to three OFDM symbols of the first slot in the downlink subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which a Physical Downlink Shared Channel (PDSCH) is allocated.
- PDSCH Physical Downlink Shared Channel
- Downlink control channels used in 3GPP LTE include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), a Physical Hybrid-ARQ Indicator Channel (PHICH), and the like.
- PCFICH Physical Control Format Indicator Channel
- PDCH Physical Downlink Control Channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- the PCFICH transmitted in the first OFDM symbol of the subframe carries information about the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
- Control information transmitted through the PDCCH is called downlink control information (DCI).
- DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command for arbitrary UE groups.
- the PHICH carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, the ACK / NACK signal for the uplink data transmitted by the terminal is transmitted on the PHICH.
- ACK Acknowledgement
- NACK Not-Acknowledgement
- the base station transmits resource allocation and transmission format of PDSCH (also referred to as DL grant), resource allocation information of PUSCH (also referred to as UL grant) through PDCCH, a set of transmission power control commands for individual terminals in any terminal group, and Enable activation of Voice over Internet Protocol (VoIP).
- a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
- the PDCCH consists of an aggregation of one or several consecutive Control Channel Elements (CCEs).
- CCEs Control Channel Elements
- the PDCCH composed of one or several consecutive CCEs may be transmitted through the control region after subblock interleaving.
- CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
- the CCE corresponds to a plurality of resource element groups.
- the format of the PDCCH and the number of possible bits of the PDCCH are determined by the correlation between the number of CCEs and the coding rate provided by the CCEs.
- DCI Downlink control information
- DCI format 0 indicates uplink resource allocation information
- DCI formats 1 to 2 indicate downlink resource allocation information
- DCI formats 3 and 3A indicate uplink transmit power control (TPC) commands for arbitrary UE groups. .
- the base station may transmit scheduling assignment information and other control information through the PDCCH.
- the physical control channel may be transmitted in one aggregation or a plurality of continuous control channel elements (CCEs).
- CCEs continuous control channel elements
- One CCE includes nine Resource Element Groups (REGs).
- the number of RBGs that are not allocated to the Physical Control Format Indicator CHhannel (PCFICH) or the Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH) is N REG .
- the available CCEs in the system are from 0 to N CCE -1 (where to be).
- the PDCCH supports multiple formats as shown in Table 2 below.
- the base station may determine the PDCCH format according to how many areas, such as control information, to send.
- the UE may reduce overhead by reading control information in units of CCE.
- the repeater can also read control information and the like in units of R-CCE.
- a resource element RE
- R-CCE relay-control channel element
- an uplink subframe may be divided into a control region and a data region in the frequency domain.
- the control region is allocated to a physical uplink control channel (PUCCH) that carries uplink control information.
- the data area is allocated to a Physical Uplink Shared CHannel (PUSCH) for carrying user data.
- PUCCH Physical Uplink Shared CHannel
- PUSCH Physical Uplink Shared CHannel
- PUCCH for one UE is allocated to an RB pair in one subframe. RBs belonging to the RB pair occupy different subcarriers in each of two slots. The RB pair assigned to the PUCCH is frequency hopped at the slot boundary.
- FIG. 4 illustrates a downlink time-frequency resource grid structure used in the present invention.
- OFDM orthogonal frequency division multiplexing
- the number of OFDM symbols included in one slot may vary depending on the length of a cyclic prefix (CP) and the interval of subcarriers. In case of multi-antenna transmission, one resource grid may be defined per one antenna port.
- CP cyclic prefix
- Each element in the resource grid for each antenna port is called a resource element (RE) and is uniquely identified by an index pair (k, l) in the slot.
- k is the index in the frequency domain
- l is the index in the time domain and k is 0, ...
- Has a value of -1 and l is 0, ..., It has any one of -1.
- the resource block shown in FIG. 4 is used to describe a mapping relationship between certain physical channels and resource elements.
- the RB may be divided into a physical resource block (PRB) and a virtual resource block (VRB).
- PRB physical resource block
- VRB virtual resource block
- the one PRB is a time domain Contiguous OFDM symbols and frequency domain It is defined as two consecutive subcarriers. here and May be a predetermined value. E.g and Can be given as Table 3 below. So one PRB ⁇ It consists of four resource elements.
- One PRB may correspond to one slot in the time domain and 180 kHz in the frequency domain, but is not limited thereto.
- PRB is at 0 in the frequency domain It has a value up to -1.
- the size of the VRB is equal to the size of the PRB.
- the VRB may be defined by being divided into a localized VRB (LVRB) and a distributed VRB (DVRB). For each type of VRB, a pair of VRBs in two slots in one subframe are assigned together a single VRB number n VRBs .
- the VRB may have the same size as the PRB.
- Two types of VRBs are defined, the first type being a localized VRB (LVRB) and the second type being a distributed VRB (DVRB).
- LVRB localized VRB
- DVRB distributed VRB
- a pair of VRBs are allocated over two slots of one subframe with a single VRB index (hereinafter may also be referred to as VRB number).
- VRB number belonging to the first slot of the two slots constituting one subframe VRBs from 0 each Is assigned an index of any one of -1, and belongs to the second one of the two slots VRBs likewise start with 0
- the index of any one of -1 is allocated.
- MIMO stands for “Multi-Input Multi-Output”
- MIMO is a method of improving transmission and reception data efficiency by adopting multiple transmission antennas and multiple reception antennas, which is far from using one transmission antenna and one reception antenna.
- MIMO will be referred to as "multi antenna”.
- Multi-antenna technology is an application of a technique of gathering and completing fragmented pieces of data received from multiple antennas without relying on a single antenna path to receive a whole message. This can improve the data transfer rate at a particular range or increase the system range for a particular data rate.
- MIMO communication technology is the next generation mobile communication technology that can be widely used in mobile communication terminals and repeaters, and attracts attention as a technology that can overcome the transmission limit of other mobile communication depending on the limit situation due to the expansion of data communication. have.
- the multiple antenna (MIMO) technology using multiple antennas at both the transmitting and receiving ends is a method that can dramatically improve communication capacity and transmission / reception performance without additional frequency allocation or power increase. It is currently receiving the most attention.
- MIMO 5 is a configuration diagram of a general multiple antenna (MIMO) communication system.
- the transmission rate according to the increase in the channel transmission capacity may be theoretically increased by multiplying the maximum rate R o by the following rate increase rate R i when using one antenna.
- Growth rate (R i) can be expressed as the following equation (1).
- N T the maximum transmittable information
- the transmission information whose transmission power is adjusted may be represented by a vector as shown in Equation 3 below.
- the information vector whose transmission power is adjusted is then multiplied by the weight matrix W to actually transmit N T transmission signals x1, x2, ..., Configure
- the weight matrix plays a role of appropriately distributing transmission information to each antenna according to a transmission channel situation.
- This transmission signal x 1 , x 2 , ..., Can be expressed by the following equation (5).
- wij represents a weight between the i th transmit antenna and the j th transmission information
- W is represented by a matrix.
- W is called a weight matrix or a precoding matrix.
- the above-described transmission signal (x) can be considered divided into the case of using the spatial diversity and the case of using the spatial multiplexing.
- the elements of the information vector s all have different values.
- the same signal is sent through multiple channel paths.
- the elements of the vector s all have the same value.
- a method of mixing spatial multiplexing and spatial diversity is also conceivable. That is, for example, a case may be considered in which the same signal is transmitted using spatial diversity through three transmission antennas, and the remaining signals are spatially multiplexed from each other.
- the received signals are received signals y 1 , y 2 , ..., of each antenna. Denote a vector y as shown in Equation 6 below.
- channels may be classified according to the transmit / receive antenna index, and a channel passing through the receive antenna i from the transmit antenna j will be denoted as h ij .
- h ij a channel passing through the receive antenna i from the transmit antenna j.
- the order of the index of h ij is the receiving antenna index first, and the index of the transmitting antenna is later.
- These channels can be grouped together and displayed in vector and matrix form. An example of the vector display is described as follows.
- Equation 7 a channel arriving from the total N T transmit antennas to the reception antenna i may be expressed as in Equation 7 below.
- Equation 7 when all the channels passing through the NR receiving antennas from the N T transmitting antennas are represented by the matrix expression as shown in Equation 7, the following Equation 8 may be expressed.
- each of the signals in the multi-antenna communication system may be represented by the following equation (10).
- the number of rows and columns of the channel matrix H indicating the state of the channel is determined by the number of transmit and receive antennas.
- the number of rows becomes equal to the number NR of receive antennas
- the number of columns becomes equal to the number NT of transmit antennas.
- the channel matrix H becomes an NR x NT matrix.
- the rank of a matrix is defined as the minimum number of rows or columns that are independent of each other.
- the rank of the matrix cannot be greater than the number of rows or columns.
- the rank (H) of the channel matrix H is limited as in Equation 11 below.
- RSs reference signals
- a transmitting end transmits a packet (or a signal) to a receiving end
- a signal transmitted by a transmitting end may be transmitted through a wireless channel, and thus distortion of a signal may occur during transmission.
- the receiver can receive the correct signal by finding channel information and correcting distortion of the transmission signal by the channel information in the received signal.
- a signal known to both a transmitting side and a receiving side is referred to as a reference signal or It is called a pilot signal.
- a reference signal can be classified into two types according to its purpose.
- Reference signals include those used for channel information acquisition and data demodulation.
- the UE since the UE can acquire downlink channel information, it needs to be transmitted over a wide band, and even a UE that does not receive downlink data in a specific subframe can receive and measure the reference signal.
- the channel measurement reference signal may be used for the measurement of handover.
- the latter is a reference signal transmitted together with a corresponding resource when the base station transmits a downlink signal, and the terminal can estimate the channel by receiving the reference signal, and thus can demodulate the data.
- Such a demodulation reference signal should be transmitted to an area where data is transmitted.
- FIG. 7 is a diagram illustrating a reference signal pattern in a 3GPP LTE system as an example of a mobile communication system.
- FIG. 7A illustrates a reference signal pattern when a normal cyclic prefix is applied
- FIG. 7B illustrates a reference signal pattern when an extended CP is applied.
- Release 8 LTE which is an example of a mobile communication system
- two types of downlink reference signals are defined for unicast service.
- CRS common reference signal
- DRS dedicated reference signal
- UE-specific reference signal UE-specific reference signal
- CRS common reference signal
- DRS dedicated reference signal
- UE-specific reference signal UE-specific reference signal
- CRS channel information acquisition and data demodulation
- This CRS is a cell-specific reference signal, and the base station transmits the CRS every subframe over a wide bandwidth.
- reference signals for up to four antenna ports are transmitted according to the number of transmit antennas of a base station.
- CRSs 1, 2, 3, and 4 for four antenna ports are R0, R1, R2, and R3, which are reference signals for each antenna port, respectively. Is allocated such that time-frequency resources do not overlap in 1RB.
- a CRS is mapped to a time-frequency resource in an LTE system
- a reference signal for one antenna port on a frequency axis is mapped and transmitted to one RE per 6 REs. Since one RB consists of 12 REs on the frequency axis, two REs per RB are used for one antenna port.
- DRS (“D”) is supported for single-antenna port transmission of the PDSCH.
- the terminal may receive information about whether or not there is a UE-specific RS from a higher layer. If data demodulation is required, a UE-specific RS is transmitted to the terminal through the resource element.
- the RS mapping rule to the resource block (RS) can be represented by the following equations (12) to (14).
- Equation 12 is an equation for representing a CRS mapping rule.
- Equation 13 is an equation for representing a mapping rule of a DRS to which a normal CP is applied
- Equation 14 is an equation for representing a mapping rule of a DRS to which an extended CP is applied.
- Equations 12 to 14 k and p represent subcarrier indexes and antenna ports, respectively.
- n s Denotes the number of RBs, the number of slot indices, and the number of cell IDs, respectively.
- the position of RS depends on the value of V shift in terms of frequency domain.
- the LTE-A system which is the standard of the next generation mobile communication system, is expected to support CoMP (Coordinated Multi Point) and Multi User-MIMO (MU-MIMO) methods, which were not supported in the existing standard, to improve data rates.
- CoMP Coordinatd Multi Point
- MU-MIMO Multi User-MIMO
- the CoMP system refers to a system in which two or more base stations or cells cooperate with each other to communicate with the terminal in order to improve communication performance between the terminal and the base station (cell or sector) in the shadow area.
- CoMP can be classified into cooperative MIMO type joint processing (CoMP-Joint Processing, CoMP-JP) and cooperative scheduling / beamforming (CoMP-CS / CB) through data sharing.
- CoMP-Joint Processing CoMP-JP
- CoMP-CS / CB cooperative scheduling / beamforming
- the UE may simultaneously receive data from each base station performing CoMP and may improve reception performance by combining signals received from each base station.
- the terminal may receive data through one base station through beamforming instantaneously.
- each base station may simultaneously receive a PUSCH signal from the terminal.
- each base station may simultaneously receive a PUSCH signal from the terminal.
- a cooperative scheduling / beamforming scheme (CoMP-CS)
- only one base station receives a PUSCH, where the decision to use the cooperative scheduling / beamforming scheme is determined by the cooperative cells (or base stations). .
- a base station allocates each antenna resource to another terminal, and selects and schedules a terminal capable of a high data rate for each antenna.
- the MU-MIMO scheme is a technique for improving system throughput.
- FIG 8 illustrates an example of an uplink subframe configuration including an SRS symbol.
- a sounding reference signal is not related to uplink data and / or control information transmission and is mainly used to evaluate channel quality to enable frequency-selective scheduling on uplink. .
- SRS may also be used for other purposes, such as providing various functions for the recently unscheduled terminal or improving power control.
- the SRS is a reference signal used for uplink channel measurement, and is a pilot signal transmitted by each terminal to a base station, and is used by the base station to estimate a channel state from each terminal to the base station.
- the channel for transmitting the SRS may have a different transmission bandwidth and transmission period for each terminal according to each terminal state. Based on the channel estimation result, the base station may determine which UE's data channel is scheduled for every subframe.
- the SRS can be used to estimate downlink channel quality.
- TDD time division duplex
- the subframe in which the SRS is transmitted by the terminal in the cell is indicated by cell-specific broadcast signaling.
- a 4-bit cell-specific 'srsSubframeConfiguration' parameter indicates a set of 15 possible subframes within which each SRS can be transmitted within each radio frame. This configuration provides flexibility in adjusting SRS overhead. As shown in FIG. 8, the UE can transmit the SRS through the last SC-FDMA symbol in the configured subframe.
- the SRS and the demodulation reference signal are located in different SC-FDMA symbols in a subframe.
- Sounding reference signals of various terminals transmitted in the last SC-FDMA of the same subframe may be distinguished according to frequency positions. Since the PUSCH data of the UE is not transmitted through the SC-FDMA symbol designed for SRS, in the worst case, 7% sounding overhead is generated by having the SRS symbol in every subframe.
- the SRS is generated by a constant Amplitude Zero Auto Correlation (CAZAC) sequence and the like, and the sounding reference signals transmitted from various terminals are CAZAC sequences having different cyclic shift values ( ⁇ ) according to Equation 15 below. ( )to be. here Is an SRS sequence.
- CAZAC constant Amplitude Zero Auto Correlation
- CAZAC sequences generated through a cyclic shift from one CAZAC sequence have a characteristic of having zero-correlation with sequences having a cyclic shift value different from itself. Using these characteristics, SRSs of the same frequency domain may be classified according to CAZAC sequence cyclic shift values.
- the SRS of each terminal is allocated on the frequency according to a parameter set by the base station. The terminal performs frequency hopping of the sounding reference signal to transmit the SRS over the entire uplink data transmission bandwidth.
- a UE having N UE antennas may transmit a non-precoded full rank SRS to a serving base station for the purpose of estimating a full channel state.
- SRSs of different antenna ports may be distinguished by different SRS transmission resources. That is, the SRS of each antenna is transmitted by being divided into time or sequence. In this manner, all N UE SRSs may be transmitted.
- the SRS transmission characteristics are different for each SRS receiving points (ie, receiving base stations).
- SRS transmission characteristics include the time when the terminal transmits the SRS, the location and amount of SRS resources used for the SRS transmission, the number of antenna ports used for the SRS transmission, the precoding matrix used by the terminal for the SRS transmission, etc. This is included.
- a CoMP terminal performing a CoMP operation may transmit a non-precoded full rank SRS to a serving base station to enable the serving base station to facilitate channel estimation.
- the direction of the desired signal of the terminal from the serving base station to inform the coordinating eNB (coordinating eNB), and then transmits the appropriate precoded SRS to the cooperative base station.
- some of the precoded SRS layers are received by both the serving base station and the cooperating base station (or neighboring base station) using SRS resources.
- all SRS resources used in the cell are orthogonal.
- the remaining SRS layers receive only the serving base station.
- the terminal provides full rank SRS information to the serving base station but can only transmit channel direction information to the cooperating base station.
- 10 is a diagram illustrating an example of precoded full rank SRS transmission.
- each SRS is a precoding matrix Precoded by The signal is transmitted in its entirety.
- I the precoding vector of the n th SRS layer.
- the number of SRS layers of the precoded SRS is equal to or smaller than the number of antennas of the UE (ie ⁇ N UE ).
- FIG. 11 is a diagram illustrating a concept of a cooperative operation of a CoMP cooperative base station.
- CoMP cooperative base station refers to base stations that perform CoMP operation in downlink and / or uplink to remove intercell interference between adjacent cells.
- Two CoMP cooperative base stations (or cells) are shown in FIG.
- One CoMP cooperative base station is a serving base station 1120 for controlling transmission / reception of a CoMP terminal performing a CoMP operation and the other CoMP cooperative base station cooperates with a serving base station to control its own transmission / reception (1170).
- FIG. 11 only two CoMP cooperative base stations are illustrated as CoMP cooperative base stations for convenience of description, but the number of CoMP cooperative base stations is not limited to two, but may be extended to more.
- Downlink channel information may be obtained through SRS transmission / reception by reciprocity between channels.
- the downlink CoMP CS / CB can be easily implemented in the present invention because there is no need to exchange channel information between CoMP cooperative base stations.
- a procedure for CoMP CS / CB operation in downlink is described below.
- FIG. 12 is a diagram illustrating an example of a procedure for downlink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation.
- terminal 3 (1150), one of the CoMP terminals transmits a full rank SRS that is not precoded to the serving base station 1120 (S1210).
- the SRS transmission may be multiplexed with the SRS of the terminals 1130 and 1140 located in the same cell 1110 (S1210).
- the serving base station 1120 estimates the downlink channel H SC between UE 3 1150 and itself using the received SRS, and determines a precoding matrix P SC to use for PDSCH transmission to UE 3 1150. It may be (S1220).
- the serving base station 1120 may inform the UE 3 1150 of the determined precoding matrix P SC .
- UE 3 1150 may be referred to as a reception matrix (or a postcoding matrix, a receive beamforming matrix, etc.) according to the precoding matrix P SC . It may be determined (S1230).
- UE 3 1150 determines a postcoding matrix determined based on the reciprocal relationship in the mitigation relationship in terms of channel matrix between downlink and uplink channels.
- the SRS precoded by the matrix may be transmitted to the cooperative base station 1170 (S1240).
- the SRS transmission may be multiplexed with the SRSs of the terminals 1180 and 1190 located in the cell 1160 to which the cooperative base station belongs (S1240).
- S1250 Denotes a downlink channel matrix between the cooperative base station 1170 and the terminal 3 1150.
- FIG. 3 illustrates a channel direction in which UE 3 1150 should face a reception beam for data reception (eg, PDSCH reception) from the serving base station 1120.
- the cooperative base station 1170 may determine a precoding matrix to be transmitted to the terminal 4 1180 and the terminal 5 1190 served by the terminal 3 1150 so as not to cause the inter-cell interference seriously ( S1260). As one example, the cooperating base station 1170 may not be effective in causing interference.
- the matrix existing in the null space of may be limited to the precoding matrices for the terminal 4 (1180) and the terminal 5 (1190).
- the serving base station 1120 may transmit a control signal to the terminal 3 (1150).
- the control signal transmitted by the serving base station 1120 includes SRS rank information, precoding matrix information, transmission power information, transmission time instance information, SRS signature, SRS hopping pattern information, and the like. It may include.
- the terminal 3 1150 may transmit the precoded SRS using a predetermined resource (time, SRS signature, etc.).
- the predetermined resource is a resource reserved for SRS transmission to the cooperating base station 1170 through a long-term signal exchange.
- the cooperative base station 1170 can easily know which UE's channel should be considered in CoMP CS / CB operation.
- resources to be used for PDSCH transmission to CoMP terminals may be determined semi-statically to avoid frequent scheduling information exchange between cooperative cells (ie, cooperative base stations performing CoMP operation).
- the terminal 3 (1150) is When transmitting the SRS precoded by the matrix to the cooperating base station 1170, it may transmit on a limited frequency resource reserved for CoMP operation, rather than at full bandwidth.
- FIG. 13 is a diagram illustrating an example of a procedure for downlink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation.
- terminal 3 1150 which is one of the CoMP terminals, has a reception matrix based on a dominant channel direction to the serving base station 1120. (Or also referred to as a postcoding matrix and a reception beamforming matrix.) (S1310).
- the matrix consists of a dominant left singular vector matrix H SC from the first to the N R_SRS th of the downlink channel between the serving base station 1120 and the UE 3 1150 or from the first of the downlink channel.
- the base station uses a precoding matrix P SC composed of dominant right singular vectors up to N R_SRS th, it may be calculated using a minimum mean square error (MMSE) method.
- MMSE minimum mean square error
- Terminal 3 1150 is a reception matrix
- the SRS precoded by the matrix may be transmitted to the serving base station 1120 and the cooperative base station 1170 (S1320). This SRS transmission is performed by the serving base station 1120 and The SRS of the terminals 1130, 1140, 1180, and 1190 located in the cells 1110 and 1160 to which the cooperative base station belongs may be multiplexed and transmitted (S1320).
- the serving base station 1120 and the cooperative base station 1170 receive the SRS in operation S1320, respectively, by the effective channel. And effective neighbor channel It may be obtained (S1330).
- the matrix represents a downlink channel matrix between the cooperative base station 1170 and the terminal 3 1150. This effective channel Explains the channel direction that the reception beam of UE 3 1150 should face for data reception (eg, reception of PDSCH) from a serving base station.
- the serving base station 1120 is a downlink effective channel matrix between itself and the terminal 3 1150 using the received SRS.
- the UE 3 1150 may determine a precoding matrix P SC to be used for PDSCH transmission.
- the cooperative base station 1170 is precoding to be transmitted to the terminals (eg, terminal 4 (1180) and terminal 5 (1190)) that is served by it, so as not to have a severe inter-cell interference effect on the terminal 3 (1150)
- the matrix may be determined (S1350).
- an effective neighboring channel includes a precoding matrix to be transmitted so that the cooperative base station 1170 does not cause interference. It can be limited to matrices that exist in the null space of.
- the uplink CoMP CS / CB scheme may be applied to the uplink in the same manner.
- a procedure for an uplink CoMP CS / CB operation will be described with reference to the accompanying drawings.
- FIG. 14 is a diagram illustrating an example of a procedure for uplink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation.
- UE 3 1150 which is one of CoMP terminals, transmits a full rank SRS that is not precoded to the serving base station 1120 (S1410). Then, the serving base station 1120 estimates an uplink channel matrix H CS between itself and the terminal 3 1150 using the SRS received from the terminal 3 1150, and the terminal 3 1150 uses the free for PUSCH transmission.
- the coding matrix P CS may be determined (S1420). In addition, the serving base station 1120 may transmit the precoding matrix P CS determined through a control channel such as a PDCCH to the terminal 3 1150 (S1430).
- the terminal 3 1150 may transmit the precoded SRS to the cooperative base station 1170 using the precoding matrix P CS (S1440).
- the SRS transmission may be multiplexed with the SRS of the terminals 1180 and 1190 located in the cell 1160 to which the cooperative base station 1170 belongs (S1440).
- Cooperative base station 1170 is an uplink channel matrix between the terminal 3 receives an SRS from 1150 to obtain the precoding matrix P CS, and the obtained precoding matrix P CS and a cooperative base station 1170 and the terminal 3 1150 Indicating Effective interference channel using matrix It may be obtained (S1450).
- the cooperative base station 1170 is configured to schedule the PUSCH transmission in its cell 1160 in order to prevent the PUSCH transmission from being interfered by the uplink transmission of the terminal 3 1150 and for the PUSCH transmission of the corresponding terminal.
- the precoding matrix may be determined (S1460).
- the terminal 3 1150 may transmit the precoded SRS using a predetermined resource (time, SRS signature, etc.).
- the predetermined resource is a resource reserved for SRS transmission to the cooperating base station 1170 through a long-term signal exchange.
- the cooperative base station 1170 can easily know which UE's channel should be considered in the CoMP CS / CB operation.
- the resource used for PDSCH transmission to CoMP terminals may be determined semi-statically to avoid frequent scheduling information exchange between cooperating cells (ie, cooperative base stations performing CoMP operation).
- step S1430 when the terminal 3 (1150) transmits the pre-coded SRS to the cooperative base station 1170, it may be transmitted through a limited frequency resource reserved for CoMP operation, rather than over the entire bandwidth.
- sharing of CoMP UE scheduling information through a backhaul link may be minimized by semi-statically setting time and frequency resources for PUSCH transmission of a CoMP UE.
- Such a method of semi-statically determining resources for PUSCH transmission can easily solve information sharing between cells participating in a CoMP operation, but communication scheduling performance of the CoMP terminal is increased due to scheduling limitations. This can be reduced.
- another method for sharing scheduling information of a CoMP terminal will be described. That is, it is proposed to inform the cooperative base station scheduling information of the CoMP terminal by using an SRS configuration without additional signaling.
- the CoMP UE may transmit an SRS precoded with the SRS configuration promised between cells according to the CoMP UE scheduling information to implicitly inform scheduling information to the cooperative base station.
- the SRS configuration information includes various parameters such as an SRS hopping pattern, a comb index, a sequence offset, an SRS transmission subframe number, and an transmitted SRS resource block (RB). can do. All or some of these parameters may be set in conjunction with CoMP terminal scheduling information. An example will be described with reference to FIG. 15.
- FIG. 15 is a diagram illustrating another example of a procedure for downlink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation.
- the terminal 3 1150 transmits a full rank SRS that is not precoded to the serving base station 1120 (S1510).
- the SRS transmission may be transmitted by being multiplexed with the SRS of the terminals 1130 and 1140 located in the same cell 1110 (S1510).
- the serving base station 1120 estimates the downlink channel H SC between UE 3 1150 and itself using the received SRS, and uses the precoding matrix P SC and frequency to be used for PDSCH transmission to UE 3 1150.
- the time resource is determined.
- the serving base station 1120 may configure precoded SRS transmission of CoMP terminals including UE 3 1150 based on the scheduling information (eg, time and frequency resource information) determined in operation S1520. (S1530).
- the serving base station 1120 may signal the SRS configuration information to the terminal 3 1150 (S1540).
- the content of the serving base station 1120 signaling to the terminal 3 (1150) includes the SRS configuration and the terminal 3 (1150) created by the SRS configuration rules shared by the cooperative base station 1170 and the serving base station 1120.
- the precoding matrix Psc to be used for PDSCH transmission to the UE may be included.
- UE 3 1150 receives a reception matrix (or a postcoding matrix, a receive beamforming matrix) according to the precoding matrix P SC . Determine (S1550).
- Terminal 3 1150 is The SRS precoded by the matrix may be transmitted to the cooperative base station 1170 (S1560).
- the configuration of the precoded SRS follows the determined indication of the serving base station 1120 in step S1530.
- the SRS transmission of the terminal 3 1150 may be multiplexed with the SRSs of the terminals 1180 and 1190 located in the cell 1160 to which the cooperative base station 1170 belongs (S1560).
- the cooperative base station 1170 uses the SRS configuration rule shared with the serving base station 1120 and receives the SRS from the terminal 3 1150, so that the cooperative base station 1170 is an effective adjacent channel.
- scheduling information of CoMP terminals may be obtained (S1570).
- S1570 Denotes a downlink channel matrix between the cooperative base station 1170 and the terminal 3 1150.
- the effective channel describes a channel direction in which UE 3 1150 should face the reception beam for reception of data reception (eg, PDSCH) from the serving base station 1120.
- the cooperative base station 1170 may serve the terminals (eg, the terminal 4 (eg, the terminal 4 (eg, the terminal 4)) allocated with a time and frequency resource overlapping with the terminal 3 1150 so as not to have a serious inter-cell interference effect on the terminal 3 1150.
- 1180 and UE 5 1190 may determine a precoding matrix to be transmitted (S1580).
- the cooperative base station 1170 may serve serving terminals (eg, the terminal 4 1180 and the terminal 5 1190 that are allocated time and frequency resources overlapping with the terminal 3 1150 so as not to cause interference. Effective neighboring channel This can be limited by determining the matrix that exists in the null space of.
- FIG. 16 is a diagram illustrating another example of a procedure for uplink CoMP CS / CB operation between a terminal and a base station performing a CoMP cooperative operation.
- UE 3 1150 which is one of CoMP terminals, transmits a full rank SRS that is not precoded to the serving base station 1120 (S1610).
- the SRS transmission of the terminal 3 1150 may be multiplexed with the SRS of the terminals 1130 and 1140 located in the same cell 1110 (S1610).
- the serving base station 1120 estimates an uplink channel matrix H CS between itself and the terminal 3 1150 using the SRS received from the terminal 3 1150, and the terminal 3 1150 sends the serving base station 1120 to the serving base station 1120.
- a precoding matrix P CS to be used for PUSCH transmission may be determined (S1620).
- the serving base station 1120 may transmit the determined precoding matrix P CS and SRS configuration information to the terminal 3 1150 through a control channel such as a PDCCH (S1630).
- the SRS configuration is determined according to the scheduling result of the CoMP terminal.
- the terminal 3 1150 may transmit the precoded SRS to the cooperative base station 1170 using the precoding matrix P CS (S1640).
- the SRS transmission may be multiplexed with the SRSs of the terminals 1180 and 1190 located in the cell 1160 to which the cooperative base station 1170 belongs (S1640).
- the cooperative base station 1170 receives the SRS from the terminal 3 1150 and applies the known SRS configuration information through sharing between the serving base stations 1120 to effectively interference channel (effective interference channel).
- S1650 scheduling information of the CoMP terminal
- the cooperative base station 1170 is scheduled by receiving a time and frequency resource overlapping with the CoMP terminal in its cell 1160 in order to prevent the PUSCH transmission from being interfered by the uplink transmission of the terminal 3 1150.
- the UE and the PUSCH transmission may determine a precoding matrix (S1660).
- S1660 a precoding matrix
- the cooperative base station 1170 may implicitly inform the scheduling information of the CoMP terminal (for example, terminal 3 (1150)).
- the serving base station 1120 sets the SRS RB transmitted to implicitly inform the frequency resource allocated to the cooperative base station 1170 to be equal to the scheduled frequency, and to inform the scheduled time resource, that is, the PDSCH transmission subframe number.
- Set the SRS transmission subframe number to "PDSCH transmission subframe number-N" (where N is a positive integer and is a semi-statically changed or fixed value as promised value between CoMP base stations). .
- resources allocated to a CoMP terminal are not the PDSCH region (uplink) but the Nth subframe and frequency after the subframe number capable of SRS transmission on the time axis.
- the axis can be limited to SRS RB that can be transmitted without collision with other terminals.
- this method has the advantage of flexible and dynamic scheduling as compared to the method of semi-statically fixing the resources of the CoMP terminal (for example, terminal 3 (1150)) mentioned above.
- the CoMP gain from the proposed scheme can compensate for the performance reduction due to the scheduling restriction.
- the serving base station 1120 explicitly configures the SRS of the CoMP terminal according to the scheduling result
- the serving base station 1120 configures the PDSCH to the CoMP terminal (for example, the terminal 3 1150).
- the serving base station 1120 Before transmitting, the serving base station 1120 notifies the CoMP terminal (for example, the terminal 3 1150) by loading scheduling information on the PDCCH, and the terminal performs precoded SRS transmission according to the SRS configuration rule. Can be done. In the latter case, the serving base station 1120 must inform the CoMP terminal (e.g., terminal 3 1150) of a semi-fixed or fixed N value (i.e., an SRS transmission subframe number (or index)). However, it is not necessary to additionally signal for the precoded SRS configuration of the CoMP UE (eg, UE 3 1150).
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
- the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- An apparatus and a method for performing CoMP (Coordinated Multiple Point) communication using a precoded sounding reference signal are industrially applicable to a mobile communication system such as 3GPP LTE, 3GPP LTE-A, IEEE 802, and the like.
Abstract
Description
Claims (15)
- 상기 SRS에 프리코딩된 상기 제 1 행렬의 허미션(hermitian) 행렬과 상기 단말과 상기 기지국 간의 하향링크 채널 행렬 ()을 이용하여 유효 인접 채널(effective neighboring channel) 행렬을 획득하는 단계; 및상기 유효 인접 채널 행렬에 기초하여 상기 기지국으로부터 서빙받는 하나 이상의 단말에게 전송할 프리코딩 행렬을 결정하는 단계를 포함하되,상기 유효 인접 채널 행렬은 상기 단말이 상기 단말의 서빙 기지국으로부터 데이터 수신을 위해 수신 빔을 향해야 하는 방향을 나타내는 행렬인, 프리코딩된 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 방법.
- 제 1항에 있어서,상기 수신한 SRS부터 상기 단말의 CoMP 스케줄링 정보를 획득하는 단계를 더 포함하며,상기 프리코딩 행렬 결정 단계는 상기 단말에 스케줄링된 시간 또는 주파수 자원과 중복되는 상기 기지국으로부터 서빙받는 하나 이상의 단말에게 전송할 프리코딩 행렬을 결정하는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 방법.
- 제 4항에 있어서,상기 결정된 프리코딩 행렬은 상기 유효 인접 채널 행렬의 널 공간(null space) 내에 존재하는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 방법.
- 제 1항에 있어서,상기 SRS는 사전에 예약된 시간 또는 주파수 자원을 통해 전송되는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 방법.
- 상기 수신한 SRS로부터의 제 1 행렬의 허미션(hermitian) 행렬 및 상기 단말과 상기 기지국 간의 하향링크 채널 행렬()을 이용하여 유효 인접 채널(effective neighboring channel) 행렬을 획득하고,상기 유효 인접 채널 행렬에 기초하여 상기 기지국으로부터 서빙받는 하나 이상의 단말에게 전송할 프리코딩 행렬을 결정하는 프로세서를 포함하되,상기 유효 인접 채널 행렬은 상기 단말이 상기 단말의 서빙 기지국으로부터 데이터 수신을 위해 수신 빔을 향해야 하는 방향을 나타내는 행렬인, 프리코딩된 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 동작을 수행하는 기지국 장치.
- 제 7항에 있어서,상기 프로세서는 상기 수신한 SRS부터 상기 단말의 CoMP 스케줄링 정보를 더 획득하며, 상기 획득한 스케줄링 정보에 기초하여 상기 단말에 스케줄링된 시간 또는 주파수 자원과 중복되는 상기 기지국으로부터 서빙받는 하나 이상의 단말에게 전송할 프리코딩 행렬을 결정하는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 기지국 장치.
- 제 8항에 있어서,상기 프로세서가 결정한 상기 프리코딩 행렬은 상기 유효 인접 채널 행렬의 널 공간(null space) 내에 존재하는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 기지국 장치.
- 제 7항에 있어서,상기 SRS는 사전에 예약된 시간 또는 주파수 자원을 통해 전송되는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 기지국 장치.
- 단말이 프리코딩되지 않은 사운딩 참조신호(Sounding Reference Signal, SRS)를 서빙 기지국으로 전송하는 단계;상기 서빙 기지국이 상기 단말로 데이터 전송을 위해 사용하는 프리코딩 행렬을 상기 서빙 기지국으로부터 수신하는 단계; 및상기 수신한 프리코딩 행렬에 기초하여 수신 행렬을 결정하고, 결정된 수신 행렬의 허미션 행렬을 SRS에 프리코딩하여 인접 기지국으로 전송하는 단계를 포함하는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 방법.
- 제 11항에 있어서,상기 서빙 기지국에 의해 결정된 프리코딩 행렬은 상기 서빙 기지국이 상기 단말로부터 수신한 사운딩 참조신호를 이용하여 상기 단말과 상기 기지국 간의 하향링크 채널 추정에 기초하여 결정된 것인, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 방법.
- 제 11항에 있어서,상기 서빙 기지국으로부터 상기 단말의 SRS 구성 정보를 수신하는 단계를 더 포함하되,상기 SRS 전송 단계에서, 상기 단말은 상기 수신한 SRS 구성 정보에 기초하여 상기 SRS를 전송하는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 방법.
- 프리코딩되지 않은 사운딩 참조신호(Sounding Reference Signal, SRS)를 서빙 기지국으로 전송하는 송신기;상기 서빙 기지국이 상기 단말로 데이터 전송을 위해 사용하는 프리코딩 행렬을 상기 서빙 기지국으로부터 수신하는 수신기;상기 수신한 프리코딩 행렬에 기초하여 수신 행렬을 결정하고, 결정된 수신 행렬의 허미션 행렬을 SRS에 프리코딩하는 프로세서; 및상기 프리코딩된 SRS를 인접 기지국으로 전송하는 송신기를 포함하는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 단말 장치.
- 제 14항에 있어서,상기 서빙 기지국으로부터 상기 단말의 SRS 구성 정보를 수신하는 수신기를 더 포함하되,상기 SRS를 전송하는 송신기는, 상기 수신한 SRS 구성 정보에 기초하여 상기 SRS를 전송하는, 사운딩 참조신호를 이용하여 CoMP(Coordinated Multiple point) 통신을 수행하는 단말 장치.
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