user method and equipment to perform uplink transmission in a wireless communication system and meth

专利摘要:
It is a method for transmitting and receiving uplink in a wireless communication system and a device for that. Specifically, a method for performing uplink transmission via user equipment (UE) in a wireless communication system can comprise the steps of downlink control (DCI) information that include resource indication (SRI) of polling reference signal (SRS) and pre-coding indication from a base station; and transmit an uplink to the base station by applying the pre-coding indicated by the pre-coding indication on an antenna port of an SRS transmitted within an SRS resource selected by the SRI
公开号:BR112019005754B1
申请号:R112019005754-4
申请日:2017-09-26
公开日:2021-01-26
发明作者:Jonghyun Park；Jiwon Kang；Kijun KIM；Haewook Park
申请人:Lg Electronics Inc；
IPC主号:

专利说明:

TECHNICAL FIELD
[001] The present invention relates to a wireless communication system and, more particularly, to a method for transmitting multiple inputs to multiple outputs (MIMO) and to an apparatus to support the same. BACKGROUND OF THE TECHNIQUE
[002] Mobile communication systems were developed to provide voice services, while ensuring user activity. Service coverage for mobile communication systems, however, has been extended even to data services, as well as voice services, and today, an explosive increase in traffic has resulted in a shortage of demand for resources and users for high-speed services, that require advanced mobile communication systems.
[003] The requirements of the next generation mobile communication system may include support for large data traffic systems, a considerable increase in the throughput of each user, the accommodation of a significantly increased number of connection devices, end latency the very low end and high energy efficiency. For this purpose, several techniques, such as small cell enhancement, dual connectivity, Multiple Multiple Inputs in Bulk Multiple Outputs (MIMO), full in-band duplexing, non-orthogonal multiple access (NOMA), support for super broadband and device network, were searched. REVELATION TECHNICAL PROBLEM
[004] An objective of the present invention is to propose a method for transmitting multiple uplink multiple inputs (MIMO).
[005] In addition, an objective of the present invention is to propose a method for configuring downlink control information (DCI) for transmission of multiple inputs to multiple outputs (MIMO).
[006] Furthermore, an objective of the present invention is to propose a method for transmitting an uplink reference signal that becomes a basis for multiple uplink multiple inputs (MIMO) and a method for controlling the same.
[007] The objectives of the technique to be obtained by the present invention are not limited to the objectives of the technique mentioned above, and other objectives of the technique not described above can of course be understood by a person who has common knowledge in the technique to which the present invention relates refers from the following description. TECHNICAL SOLUTION
[008] In one aspect of the present invention, a method for performing uplink transmission via user equipment (UE) in a wireless communication system may include: receiving downlink control (DCI) information that includes the indication of resource (SRI) of sounding reference signal (SRS) and indication of pre-coding from a base station; and transmitting an uplink to the base station by applying the pre-coding indicated by the pre-coding indication on an antenna port of an SRS transmitted on an SRS resource selected by SRI.
[009] In another aspect of the present invention, user equipment (UE) that performs uplink transmission in a wireless communication system may include: a radio frequency (RF) unit for transmitting and receiving a radio signal; and a processor that controls the RF unit, and the processor can be configured to receive downlink control (DCI) information that includes probe reference signal (SRS) resource indication and pre-coding indication from base station, and transmit an uplink to the base station by applying the foot-coding indicated by the pre-coding indication on an SRS antenna port transmitted on an SRS resource selected by SRI.
[010] Preferably, the method may additionally include transmitting a pre-encoded SRS to each of one or more SRS resources configured for the UE to the base station.
[011] Preferably, a beamforming vector and / or beamforming coefficient applied for transmission of the pre-coded SRS can be configured through the control channel signaling by the base station or determined arbitrarily by the UE.
[012] Preferably, the beamforming vector and / or beamforming coefficient applied for the pre-coded SRS transmission in the SRS resource can be determined based on a beamforming vector and / or formation coefficient. of beams used to receive a downlink reference signal (DL RS).
[013] Preferably, the DL RS can be a channel state information reference signal (CSI-RS), and a CSI-RS resource used to determine the beam-forming vector and / or beam-forming coefficient applied for the transmission of pre-coded SRS can be indicated by the base station.
[014] Preferably, an independent beamforming vector and / or beamforming coefficient can be applied for each subband for the transmission of pre-coded SRS in the SRS resource.
[015] Preferably, the beamforming vector and / or beamforming coefficient applied to the pre-coded SRS transmission for each subband can be determined based on a beamforming vector and / or formation coefficient of beams used to receive a downlink reference signal (DL RS).
[016] Preferably, the DL RS can be a channel state information reference signal (CSI-RS), and a CSI-RS resource used to determine the beam-forming vector and / or beam-forming coefficient applied for pre-coded SRS transmission can be indicated by the base station.
[017] Preferably, DCIs may additionally include a classification indication for uplink transmission.
[018] Preferably, the number of classifications for uplink transmission can be determined as the number of SRS antenna ports transmitted on the SRS resource selected by SRI.
[019] Preferably, the pre-coding indication can be divided into the first pre-coding indication and second pre-coding indication, and the second pre-coding indication can be jointly coded with link resource allocation information upward planned for the UE. ADVANTAGE EFFECTS
[020] In accordance with the modality of the present invention, pre-coding optimized by selective frequency can be supported even on the uplink.
[021] Furthermore, according to the modality of the present invention, the uplink transmission transfer rate can be intensified by applying the optimized pre-coding for each uplink subband (group of resource blocks).
[022] Furthermore, in accordance with the modality of the present invention, the overhead of downlink control information related to the uplink to apply uplink subband precoding (group of resource blocks) can be minimized.
[023] The effects that can be obtained by the present invention are not limited to the effects mentioned above, and other technical effects not described above can of course be understood by a person who has common knowledge in the technique to which the present invention refers from following description. DESCRIPTION OF THE DRAWINGS
[024] The accompanying drawings, which are included in the present invention as part of the description to aid in the understanding of the present invention, provide embodiments of the present invention, and describe the technical features of the present invention with the description below.
[025] Figure 1 illustrates the structure of a radio frame in a wireless communication system to which the present invention can be applied.
[026] Figure 2 is a diagram illustrating a resource grid for a downlink partition in a wireless communication system to which the present invention can be applied.
[027] Figure 3 illustrates a downlink subframe structure in a wireless communication system to which the present invention can be applied.
[028] Figure 4 illustrates an uplink subframe structure in a wireless communication system to which the present invention can be applied.
[029] Figure 5 shows the configuration of a known MIMO communication system.
[030] Figure 6 is a diagram showing a channel from a plurality of transmitting antennas to a single receiving antenna.
[031] Figure 7 illustrates reference signal patterns mapped to downlink resource block pairs in a wireless communication system to which the present invention can be applied.
[032] Figure 8 is a diagram illustrating features to which reference signals are mapped in a wireless communication system to which the present invention can be applied.
[033] Figure 9 illustrates an uplink subframe that includes a probe reference signal symbol in a wireless communication system to which the present invention can be applied.
[034] Figure 10 is a diagram illustrating a self-contained subframe structure in the wireless communication system to which the present invention can be applied.
[035] Figure 11 illustrates a model of transceiver unit in the wireless communication system to which the present invention can be applied.
[036] Figure 12 is a diagram illustrating a service area for each transceiver unit in the wireless communication system to which the present invention can be applied.
[037] Figure 13 is a diagram illustrating a method for transmitting and receiving an uplink, according to an embodiment of the present invention.
[038] Figure 14 is a block diagram of a wireless communication device, according to an embodiment of the present invention. MODE FOR THE INVENTION
[039] Some embodiments of the present invention are described in detail with reference to the accompanying drawings. A detailed description to be disclosed in conjunction with the accompanying drawings is intended to describe some embodiments of the present invention and is not intended to describe a single embodiment of the present invention. The following detailed description includes more details in order to provide a complete understanding of the present invention. However, those skilled in the art will understand that the present invention can be implemented without further details.
[040] In some cases, in order to prevent the concept of the present invention from becoming vague, known structures and devices are omitted or can be shown in a block diagram form based on the main functions of each structure and device
[041] In this specification, a base station has the meaning of a terminal node in a network through which the base station communicates directly with a device. In this document, a specific operation that is described to be performed by a base station can be performed by an upper node of the base station, depending on the circumstances. That is, it is evident that in a network that includes a plurality of network nodes that includes a base station, various operations performed for communication with a device can be performed by the base station or other network nodes in addition to the base station. The base station (BS) can be replaced by another term, such as a fixed station, a Node B, an eNB (Evolved Node B), a Transceiver-Base System (BTS) or an access point (AP). In addition, the device can be fixed or mobile and can be replaced by another term, such as User Equipment (UE), a Mobile Station (MS), a User Terminal (UT), a Mobile Subscriber Station ( MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), a Wireless Terminal (WT), a Machine Type Communication Device (MTC), a Machine to Machine Device (M2M) or a Device Device a Device (D2D).
[042] Hereinafter, downlink (DL) means communication from an eNB to UE, and uplink (UL) means communication from UE to an eNB. In the DL, a transmitter can be part of an eNB, and a receiver can be part of the UE. In UL, a transmitter can be part of the UE, and a receiver can be part of an eNB.
[043] The specific terms used in the following description have been provided to assist in the understanding of the present invention, and the use of such specific terms can be changed in a number of ways without departing from the spirit of the technique of the present invention.
[044] The following technologies can be used in a variety of wireless communication systems, such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA) , Multiple Access by Orthogonal Frequency Division (OFDMA), Multiple Access by Single Carrier Frequency Division (SC-FDMA) and Non-Orthogonal Multiple Access (NOMA). CDMA can be implemented using radio technology, such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented using radio technology, such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Advanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented using radio technology, such as Institute of Electrical and Electronic Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20 or UTRA Evolved (E-UTRA). UTRA is part of a Universal Mobile Telecommunications System (UMTS). The Long Term Evolution (LTE) of a 3rd Generation Partnership Project (3GPP) is part of an Evolved UMTS (E-UMTS) with the use of an enhanced UMTS Terrestrial Radio Access (E-UTRA), and adopts OFDMA in link downward and adopts SC-FDMA in uplink. Advanced LTE (LTE-A) is an evolution of LTE 3GPP.
[045] The modalities of the present invention can be supported by the standard documents disclosed in at least one among IEEE 802, 3GPP, and 3GPP2, that is, radio access systems. That is, the steps or portions that belong to the modalities of the present invention and that are not described in order to clearly state the spirit of the technique of the present invention can be supported by the documents. In addition, all terms disclosed in this document can be described by the standard documents.
[046] In order to clarify a further description, 3GPP LTE / LTE-A or new RAT (RAT in 5G system (5th generation)) is mainly described, but the technical characteristics of the present invention are not limited to this. GENERAL SYSTEM TO WHICH THE PRESENT INVENTION CAN BE APPLIED
[047] Figure 1 shows the structure of a radio frame in a wireless communication system to which a modality of the present invention can be applied.
[048] 3GPP LTE / LTE-A supports a type 1 radio frame structure that can be applicable to Frequency Division Duplexing (FDD) and a radio frame structure that can be applicable to Time Division Duplexing (TDD) ).
[049] The size of a radio frame in the time domain is represented as a multiple of a time unit of T_s = 1 / (15000 * 2048). A UL and DL transmission includes the radio frame which has a duration of T_f = 307200 * T_s = 10 ms.
[050] Figure 1 (a) exemplifies a type 1 radio frame structure. The type 1 radio frame can be applied to both FDD full duplex and FDD half duplex duplexing.
[051] A radio frame includes 10 subframes. A radio frame includes 20 partitions of T_slot = 15360 * T_s = 0.5 ms in length, and 0 to 19 indexes are provided for each of the partitions. A subframe includes two consecutive partitions in the time domain, and subframe i includes partition 2i and partition 2i + 1. The time required to transmit a subframe is called a transmission time interval (TTI). For example, the length of subframe i can be 1 ms and the length of a partition can be 0.5 ms.
[052] A UL transmission and a DL I transmission from the FDD are distinguished in the frequency domain. Considering that there is no restriction on the FDD full duplex, a UE may not transmit and receive simultaneously in the FDD half duplex operation.
[053] A partition includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and includes a plurality of Resource Blocks (RBs) in a frequency domain. In LTE 3GPP, OFDM symbols are used to represent a symbol period because OFDMA is used in downlink. An OFDM symbol can be called an SC-FDMA symbol or symbol period. An RB is a resource allocation unit that includes a plurality of contiguous subcarriers in a partition.
[054] Figure 1 (b) shows type 2 frame structure.
[055] A type 2 radio frame includes two 153600 half frames * T_s = 5 ms in length, each. Each half frame includes 5 subframes of 30720 * T_s = 1 ms in length.
[056] In the type 2 frame structure of a TDD system, an uplink-downlink configuration is a rule that indicates whether the uplink and downlink are allocated (or reserved) for all subframes.
[057] Table 1 shows the uplink-downlink configuration. Table 1

[058] With reference to Table 1, in each subframe of the radio frame, 'D' represents a subframe for a DL transmission, 'U' represents a subframe for UL transmission, and 'S' represents a special subframe that includes three types of fields that include a Downlink Pilot Time Partition (DwPTS), a Guard Period (GP) and an Uplink Pilot Time Partition (UpPTS).
[059] A DwPTS is used for an initial cell search, synchronization or channel estimation in a UE. An UpPTS is used to estimate the channel in an eNB and to synchronize a UL transmission synchronization from a UE. A GP is the duration to remove interference that occurs at a UL due to the multipath delay of a DL signal between a UL and a DL.
[060] Each subframe i includes partition 2i and partition 2i + 1 of T_slot = 15360 * T_s = 0.5 ms.
[061] The UL-DL configuration can be classified into 7 types, and the position and / or the number of a DL subframe, a special subframe and an UL subframe are different for each configuration.
[062] A time point at which a change is made from downlink to uplink or a time point at which a change is made from uplink to downlink is called a switching point. The periodicity of the switching point means a cycle in which an uplink subframe and a downlink subframe are changed is repeated in the same way. Both 5 ms and 10 ms are supported for the periodicity of a switching point. If the periodicity of a switching point has a cycle of a 5 ms downlink-uplink switching point, the special subframe S is present in each half frame. If the periodicity of a switching point has a 5 ms downlink-uplink switching point cycle, the special subframe S is present in the first half frame only.
[063] In all configurations, 0 and 5 subframes and one DwPTS are used only for downlink transmission. An UpPTS and a subframe subsequent to a subframe are always used for uplink transmission.
[064] Such uplink-downlink configurations can be provided for either an eNB such as the UE or system information. An eNB can notify the UE of a change in the uplink-downlink allocation status of a radio frame by transmitting only the uplink-downlink configuration information index to the UE whenever the configuration information of uplink-downlink are changed. In addition, configuration information is a type of downlink control information and can be transmitted through a Physical Downlink Control Channel (PDCCH) like other programming information. The configuration information can be transmitted to all UEs within a cell via a broadcast channel as broadcast information.
[065] Table 2 represents the configuration (DwPTS / GP / UpPTS length) of a special subframe. Table 2


[066] The structure of a radio subframe, according to the example in Figure 1 is just an example, and the number of subcarriers included in a radio frame, the number of partitions included in a subframe and the number of OFDM symbols included in a partition can be changed in several ways.
[067] Figure 2 is a diagram illustrating a resource grid for a downlink partition in a wireless communication system to which a modality of the present invention can be applied.
[068] With reference to Figure 2, a downlink partition includes a plurality of OFDM symbols in a time domain. It is described in the present document that a downlink partition includes 7 OFDMA symbols and a resource block includes 12 subcarriers for exemplary purposes only, and the present invention is not limited to that.
[069] Each element in the resource grid is called a resource element, and a resource block (RB) includes 12x7 resource elements. The number of NADL RBs included in a downlink partition depends on a downlink transmission bandwidth.
[070] The structure of an uplink partition can be the same as that of a downlink partition.
[071] Figure 3 shows the structure of a downlink subframe in a wireless communication system to which a modality of the present invention can be applied.
[072] With reference to Figure 3, a maximum of three OFDM symbols located on a front portion of a first partition of a subframe corresponds to a control region in which control channels are allocated, and the remaining OFDM symbols correspond to a region of data on which a physical downlink shared channel (PDSCH) is allocated. The downlink control channels used in LTE 3GPP include, for example, a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH) and a physical hybrid ARQ indicator channel (PHICH) .
[073] A PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (that is, the size of a control region) that are used to transmit control channels within the subframe. A PHICH is a response channel for uplink and carries a confirmation signal (ACK) / negative confirmation (NACK) for a Hybrid Automatic Repeat Request (HARQ). The control information transmitted in a PDCCH is called Downlink Control Information (DCI). DCIs include uplink resource allocation information, downlink resource allocation information, or an uplink transmit (Tx) power control command for a specific group of UEs.
[074] A PDCCH can carry information about resource allocation and transport format of a downlink shared channel (DL-SCH) (which is also called “downlink concession”), resource allocation information about a uplink shared channel (UL-SCH) (also called “uplink grant”), paging information about a PCH, system information about a DL-SCH, resource allocation of a control message upper layer, such as random access response transmitted on a PDSCH, a set of transmission power control commands for the individual UE within the specific group of UEs, and the activation of a Voice over Internet Protocol (VoIP), etc. A plurality of PDCCHs can be transmitted within the control region, and the UE can monitor a plurality of PDCCHs. A PDCCH is transmitted on a single Control Channel Element (CCE) or an aggregation of some contiguous CCEs. A CCE is a logical allocation unit that is used to provide a PDCCH with a coding rate according to the state of a radio channel. A CCE corresponds to a plurality of groups of resource elements. The format of a PDCCH and the number of bits available from a PDCCH are determined by an association relationship between the number of CCEs and an encoding rate provided by the CCEs.
[075] An eNB determines the format of a PDCCH based on the DCIs to be transmitted to the UE and attaches a Cyclic Redundancy Check (CRC) to the control information. A unique identifier (a Temporary Radio Network Identifier (RNTI)) is masked for the CRC depending on the owner or use of a PDCCH. If the PDCCH is a PDCCH for the specific UE, a unique identifier for the UE, for example, a Cell RNTI (C-RNTI) can be masked for the CRC. If the PDCCH is a PDCCH for a paging message, a paging indication identifier, for example, a Paging RNTI (P-RNTI) can be masked for the CRC. If the PDCCH is a PDCCH for system information, more specifically, a System Information Block (SIB), a system information identifier, for example, a System Information RNTI (SI-RNTI) can be masked for the CRC. A Random Access RNTI (RA-RNTI) can be masked for the CRC to indicate a random access response which is a response to the transmission of a random access preamble by the UE.
[076] Figure 4 shows the structure of an uplink subframe in a wireless communication system to which a modality of the present invention can be applied.
[077] With reference to Figure 4, an uplink subframe can be divided into a control region and a data region in the frequency domain. A physical uplink control channel (PUCCH) that carries uplink control information is allocated in the control region. A shared physical uplink (PUSCH) channel carrying user data is allocated in the data region. In order to maintain the unique carrier characteristic, an UE does not send a PUCCH and a PUSCH at the same time.
[078] A pair of Resource Blocks (RB) is allocated in a PUCCH to a UE within a subframe. The RBs that belong to a pair of RBs occupy different subcarriers in each of the 2 partitions. This is called by the fact that a pair of RBs allocated in a PUCCH is skipped by frequency in a partition boundary. MULTIPLE INPUTS MULTIPLE OUTPUTS (MIMO)
[079] A MIMO technology does not use a single transmit antenna and single receive antenna that have been commonly used until now, but it does use a multiple transmit antenna (Tx) and a multiple receive antenna (Rx). In other words, MIMO technology is a technology to increase capacity or improve performance with the use of multiple input / multiple output antennas at the transmitting or receiving end of a wireless communication system. Henceforth, MIMO is called a “multiple input / multiple output antenna”.
[080] More specifically, the multiple input / multiple output antenna technology does not depend on a single antenna path in order to receive a single total message and complete the total data by collecting a plurality of data received across multiple antennas. As a result, multiple input / multiple output antenna technology can increase a data transfer rate within a specific system range and can also increase a system rate through a specific data transfer rate.
[081] An efficient multiple input / multiple output antenna technology is expected to be used because next generation mobile communication requires a much higher data transfer rate than that of existing mobile communication. In such a situation, MIMO communication technology is a next generation mobile communication technology that can be widely used in the mobile communication UE and a relay node and have been a highlight as a technology that can overcome a limit on the rate of transmission. transfer of another mobile communication attributable to the expansion of data communication.
[082] However, the multi-input / multiple-output antenna (MIMO) technology of various transmission efficiency enhancement technologies that are being developed was more prominent as a method with the ability to significantly improve communication capacity and performance. transmission / reception even without the allocation of additional frequencies or an increase in power.
[083] Figure 5 shows the configuration of a known MIMO communication system.
[084] With reference to Figure 5, if the number of transmit antennas (Tx) is increased to N_T and the number of receive antennas (Rx) is increased to N_R at the same time, a theoretical channel transmission capacity is increased proportionally the number of antennas, unlike the case where a plurality of antennas is used only on a transmitter or receiver. Consequently, a throughput can be improved, and the frequency efficiency can be significantly improved. In that case, a transfer rate according to an increase in channel transmission capacity can theoretically be increased by a value obtained by multiplying the following rate increase R_i by a maximum transfer rate R_o if an antenna is used. EQUATION 1 Ri = min (NT, NR)
[085] That is, a MIMO communication system that uses 4 transmitting antennas and 4 receiving antennas, for example, a quadruple transfer rate can theoretically be obtained in comparison with a single antenna system.
[086] Such multi-input / multiple-output antenna technology can be divided into a spatial diversity method to increase transmission reliability with the use of symbols that pass through multiple channel paths and a spatial multiplexing method to enhance a transfer rate by sending a plurality of symbols at the same time with the use of a plurality of transmission antennas. In addition, active research is recently being carried out on one method to properly take advantage of the two methods by combining the two methods.
[087] Each of the methods is described in more detail below.
[088] First, the spatial diversity method includes a space-time block code series method and a space-time Trelis code series method using a diversity gain and a coding gain at the same time. In general, the Trelis code series method is better in terms of bit error rate enhancing performance and the degree of code generation freedom, whereas the space-time block series method has low operational complexity. Such a gain in spatial diversity can correspond to an amount that corresponds to the product (N_T x N_R) of the number of transmitting antennas (N_T) and the number of receiving antennas (N_R).
[089] Second, the spatial multiplexing scheme is a method for sending different data streams across transmission antennas. In this case, at a receiver, mutual interference is generated between the data transmitted by a transmitter at the same time. The receiver removes interference using an appropriate signal processing scheme and receives the data. A noise removal method used in this case may include a Maximum Likelihood Detection (MLD) receiver, a Zero-Forcing (ZF) receiver, a Minimum Minimum Square Error (MMSE) receiver, a Diagonal in Space-Time Layers of the Bell Laboratories (Diagonal-Bell Laboratories Layered Space-Time - D-BLAST), Vertical Space-Time Layered Bell Laboratories (Vertical-Bell Laboratories Layered Space-Time - V-BLAST). In particular, if a transmission end can be aware of the channel information, a Decomposition into Singular Values (SVD) method can be used.
[090] Third, there is a method of using a combination of spatial diversity and spatial multiplexing. If only a spatial diversity gain is obtained, a performance improvement gain in line with an increase in the diversity gap is gradually saturated. If only a spatial multiplexing gain is used, the transmission reliability on a radio channel is deteriorated. The methods to solve the problems and obtain the two researched gains and can include a method of double diversity of space-time transmission (double STTD) and a coded modulation interspersed by bit of space-time (STBICM).
[091] In order to describe a communication method in a multiple input / multiple output antenna system, such as the one described above, in more detail, the communication method can be represented as follows through a mathematical model.
[092] First, as shown in Figure 5, it is assumed that the N_T transmitting antennas and the NR receiving antennas are present.
[093] First, a transmission signal is described below. If the N_T transmission antennas are present, as described above, a maximum number of information that can be transmitted is N_T, which can be represented using the following vector.

[094] However, the transmission power may be different in each of the transmission information s_1, s_2, ..., s_NT. In this case, if the transmission power information is P_1, P_2, ..., P_NT, the transmission information that has controlled transmission power can be represented using the following vector.

[095] In addition, the transmission information that has controlled transmission power in Equation 3 can be represented as follows using the diagonal matrix P of the transmission power.

[096] However, the vector of information that has controlled transmission power in Equation 4 is multiplied by a weight matrix W, thus forming transmission signals N_T x_1, x_2, ..., x_NT that are actually transmitted. In this case, the weight matrix works to properly distribute the transmission information to antennas according to a transport channel condition. The following can be represented using the transmission signals x_1, x_2, ..., x_NT.

[097] In this case, w_ij indicates the weight between an i-th transmission antenna and a j-th transmission information, and W is an expression of a weight matrix. such a matrix W is called a weight matrix or pre-coding matrix.
[098] However, the transmission signal x, such as the one described above, can be considered to be used in a case where a spatial diversity is used and a case where a spatial multiplexing is used.
[099] If spatial multiplexing is used, all elements of the information vector s have different values because different signals are multiplexed and transmitted. In contrast, if spatial diversity is used, all elements of the information vector s have the same value because the same signals are transmitted across multiple channel paths.
[0100] A method for mixing spatial multiplexing and spatial diversity can be taken into account. In other words, the same signals can be transmitted using spatial diversity through 3 transmission antennas, for example, and the remaining different signals can be spatially multiplexed and transmitted.
[0101] If the receiving antennas N_R are present, the receiving signals y_1, y_2, ..., y_NR of the respective antennas are represented as follows using a vector y.

[0102] However, if channels in a multiple input / multiple output antenna communication system are modeled, the channels can be classified according to the transmit / receive antenna indices. A channel that passes through a receiving antenna i from a transmitting antenna j is represented as h_ij. In this case, it should be noted that in the order of the h_ij index, the index of a receiving antenna comes first and the index of a transmitting antenna then comes later.
[0103] Several channels can be grouped and expressed in a vector and matrix form. For example, a vector expression is described below.
[0104] Figure 6 is a diagram showing a channel from a plurality of transmitting antennas to a single receiving antenna.
[0105] As shown in Figure 6, a channel from a total of transmit antennas N_T to a receive antenna i can be represented as follows.

[0106] Furthermore, if all channels from the transmitting antenna N_T to the receiving antennas NR are represented using a matrix expression, such as Equation 7, they can be represented as follows.

[0107] However, White Additive Gaussian Noise (AWGN) is added to a real channel after the real channel experiences the H channel matrix. Consequently, AWGN n_1, n_2, ..., n_NR added to the N_R receiving antennas, respectively , is represented using a vector as follows.

[0108] A transmit signal, a receive signal, a channel, and AWGN in a multi-input / multiple-output antenna communication system can be represented to have the following relationship by modeling the transmit signal, receive signal , channel, and AWGN, such as those described above.

[0109] However, the number of rows and columns of the H channel matrix indicative of the status of the channels is determined by the number of transmit / receive antennas. In the H channel matrix, as described above, the number of rows becomes equal to the number of receiving antennas N_R, and the number of columns becomes equal to the number of transmitting antennas N_T. That is, the H channel matrix becomes an N_RxN_T matrix.
[0110] In general, the classification of a matrix is defined as a minimum number of the number of independent rows or columns. Consequently, the rank of the matrix is not greater than the number of rows or columns. As for the figurative style, for example, the H classification of the H channel matrix is limited as follows.

[0111] Furthermore, if a matrix is subjected to eigenvalue decomposition, a classification can be defined as the number of eigenvalues that belong to eigenvalues and that are not 0. Also, if a classification is submitted to Classification into Values Singular (SVD), it can be defined as the number of singular values other than 0. Consequently, it can be said that the physical meaning of a classification in a channel matrix is a maximum number in which different information can be transmitted in a given channel.
[0112] In this specification, a “classification” for MIMO transmission indicates the number of paths through which signals can be independently transmitted at a specific time point and a specific frequency resource. The “number of layers” indicates the number of signal streams transmitted through each path. In general, a classification has the same meaning as the number of layers, except where otherwise described, because a transmission end sends the number of layers that corresponds to the number of classifications used in signal transmission. REFERENCE SIGN (RS)
[0113] In a wireless communication system, a signal can be distorted during transmission because the data is transmitted over a radio channel. In order for a receiving end to receive precisely a distorted signal, the distortion of a received signal needs to be corrected with the use of channel information. In order to detect channel information, a method for detecting channel information using the degree of distortion of a signal transmission method and a signal known to both the transmitting and receiving sides when they are transmitted over a channel is mainly used. The previously mentioned signal is called a pilot signal or reference signal (RS).
[0114] Even more recently, when most mobile communication systems transmit a packet, they use a method capable of improving the efficiency of transmit / receive data by adopting multiple transmit antennas and multiple receive antennas instead of use a transmitting antenna and a receiving antenna that have been used so far. When data is transmitted and received using multiple input / output antennas, a channel state between the transmitting antenna and the receiving antenna needs to be detected in order to receive the signal precisely. Consequently, each transmitting antenna must have an individual reference signal.
[0115] In a mobile communication system, an RS can basically be divided into two types depending on its purpose. There is an RS that has an objective of obtaining channel status information and an RS used for data demodulation. The former has an objective of obtaining, by means of a UE, to obtain channel status information on the downlink. Consequently, a corresponding RS needs to be transmitted over a broadband, and a UE needs to be able to receive and measure the RS although the UE does not receive downlink data in a specific subframe. In addition, the former is also used for measurement of radio resource management (RRM), such as automatic switching. The latter is an RS transmitted along with the corresponding resources when an eNB transmits the downlink. A UE can perform channel estimation when receiving a corresponding RS and, thus, can demodulate data. The corresponding RS needs to be transmitted in a region where the data is transmitted.
[0116] A downlink RS includes a common RS (CRS) for the acquisition of information about a channel state shared by all UEs within a cell and measurement, such as automatic switching, and a dedicated RS (DRS) used for demodulation of data for only one specific UE. Information for demodulation and channel measurement can be provided using such RSs. That is, DRS is used only for data demodulation, and CRS is used for both purposes of acquiring channel information and data demodulation.
[0117] The receiving side (ie, UE) measures a channel state based on a CRS and feeds an indicator related to channel quality, such as a channel quality indicator (CQI), a matrix index of pre-coding (PMI) and / or a classification indicator (RI), back to the transmission side (ie, an eNB). CRS is also called a cell-specific RS. In contrast, a reference signal related to the feedback of channel state information (CSI) can be defined as a CSI-RS.
[0118] DRS can be transmitted via resource elements if data on a PDSCH needs to be demodulated. A UE can receive information about whether a DRS is present through an upper layer, and the DRS is only valid if a corresponding PDSCH has been mapped. DRS can also be called an EU-specific RS or demodulation RS (DMRS).
[0119] Figure 7 illustrates reference signal patterns mapped to pairs of downlink resource blocks in a wireless communication system to which the present invention can be applied.
[0120] With reference to Figure 7, a pair of downlink resource blocks, that is, a unit in which a reference signal is mapped, can be represented in the form of a subframe in a time domain X 12 subcarriers in a frequency domain. That is, on a geometric time axis (a geometric x axis), a pair of resource blocks has a length of 14 OFDM symbols in the case of a normal cyclic prefix (CP) (Figure 7a) and has a length of 12 symbols OFDM in the case of an extended cyclic prefix (CP) (Figure 7b). In the resource block truss, the resource elements (REs) indicated by "0", "1", "2" and "3" mean the locations of the antenna port index CRSs "0", "1", "2" and "3", respectively, and the REs indicated by "D" signify the location of a DRS.
[0121] A CRS is described in more detail below. CRS is a reference signal that is used to estimate the channel of a physical antenna and can be received by all UEs located within a common cell. CRS is distributed over a full frequency bandwidth. That is, the CRS is a cell-specific signal and is transmitted in each subframe over a broadband. In addition, CRS can be used for channel quality information (CSI) and data demodulation.
[0122] A CRS is defined in several formats depending on an antenna array on the transmission side (eNB). In the LTE 3GPP system (for example, Version 8), an RS for a maximum of four antenna ports is transmitted depending on the number of transmission antennas in an eNB. The side from which a downlink signal is transmitted has three types of antenna arrays, such as a single transmitting antenna, two transmitting antennas and four transmitting antennas. For example, if the number of transmit antennas in an eNB is two, CRSs for an antenna port # 0 and an antenna port # 1 are transmitted. If the number of transmit antennas in an eNB is four, CRSs for antenna ports # 0 ~ # 3 are transmitted. If the number of transmission antennas in an eNB is four, a CRS pattern in an RB is shown in Figure 7.
[0123] If an eNB uses a single transmitting antenna, reference signals for a single antenna port are arrayed.
[0124] If an eNB uses two transmit antennas, reference signals for two transmit antenna ports are arrayed using a time division multiplexing (TDM) scheme and / or a division multiplexing scheme frequency (FDM). That is, different time resources and / or different frequency resources are allocated in order to distinguish between reference signals for two antenna ports.
[0125] In addition, if an eNB uses four transmit antennas, reference signals for four transmit antenna ports are arrayed using the TDM and / or FDM schemes. Channel information measured by the receiving side (i.e., UE) of a downlink signal can be used to demodulate transmitted data using a transmission scheme, such as single transmission antenna transmission, transmission diversity, spatial closed-circuit multiplexing, open-circuit spatial multiplexing or a multiple user / multiple output antenna (MIMO) antenna.
[0126] If a multiple input multiple output antenna is supported, when an RS is transmitted over a specific antenna port, the RS is transmitted at the locations of specified resource elements depending on an RS standard and is not transmitted at the locations of feature elements specified for other antenna ports. That is, RSs between different antennas do not overlap.
[0127] A DRS is described in more detail below. DRS is used to demodulate data. In multi-input multiple-output antenna transmission, the pre-coding weight used for a specific UE is combined with a transmission channel transmitted by each transmission antenna when the UE receives an RS, and is used to estimate a corresponding channel without any change.
[0128] An LTE 3GPP system (for example, Version 8) supports a maximum of four transmission antennas, and a DRS for rating 1 beam formation is defined. The DRS for beam formation classification 1 also indicates an RS for an antenna port index 5.
[0129] In an LTE-A system, that is, an advanced and developed LTE system, the project is necessary to support a maximum of eight transmission antennas in the downlink of an eNB. Consequently, RSs for a maximum of eight transmit antennas also need to be supported. In the LTE system, only downlink RSs for a maximum of four antenna ports have been defined. Consequently, if an eNB has four to a maximum of eight downlink transmission antennas in the LTE-A system, RSs for these antenna ports need to be further defined and designed. In relation to the RSs for a maximum of eight transmit antenna ports, the previously mentioned RS for channel measurement and the previously mentioned RS for data demodulation need to be designed.
[0130] One of the important factors that need to be considered in the design of an LTE-A system is compatibility with previous versions, that is, that an UE LTE needs to operate well even in the LTE-A system, which needs to be supported by the system. From a transmission point of view RS, in the time-frequency domain in which a CRS defined in LTE is transmitted in a total band in each subframe, RSs for a maximum of eight transmission antenna ports need to be additionally defined. In the LTE-A system, if an RS standard for a maximum of eight transmit antennas is added over a total band in each subframe using the same method as the existing LTE CRS, the RS overhead is excessively increased.
[0131] Consequently, the newly designed RS in the LTE-A system is basically divided into two types, which include an RS that has a channel measurement object for selecting MCS or PMI (RS for channel status information or RS channel status indication (CSI-RS)) and an RS for the demodulation of data transmitted through eight transmission antennas (data demodulation RS (DM-RS)).
[0132] The CSI-RS for the channel measurement object is characterized by the fact that it is designed for an object focused on channel measurement other than the existing CRS for objects for measurement, such as channel measurement and automatic switching, and for demodulation of data. In addition, CSI-RS can also be used for an object for measurement, such as automatic change. CSI-RS does not need to be transmitted in each subframe other than CRS because it is transmitted to an object to obtain information about a channel state. In order to reduce the overhead of a CSI-RS, the CSI-RS is intermittently transmitted on the geometric time axis.
[0133] For data demodulation, a DM-RS is transmitted in a dedicated way to a UE programmed in a corresponding time-frequency domain. That is, a DM-RS for a specific UE is transmitted only in a region where the corresponding UE was programmed, that is, in the time-frequency domain in which the data is received.
[0134] In the LTE-A system, a maximum of eight transmission antennas are supported on the downlink of an eNB. In the LTE-A system, if RSs for a maximum of eight transmit antennas are transmitted over a total band in each subframe using the same method as the CRS in the existing LTE, the RS overhead is excessively increased. Consequently, in the LTE-A system, an RS was separated in the CSI-RS from the CSI measurement object for the selection of MCS or PMI and the DM-RS for data demodulation and, thus, the two RSs were added. CSI-RS can also be used for an object, such as an RRM measurement, but it was designed for a main object for the acquisition of CSI. The CSI-RS does not have to be transmitted in each subframe because it is not used for data demodulation. Consequently, in order to reduce the overhead of the CSI-RS, the CSI-RS is transmitted intermittently on the geometric time axis. That is, the CSI-RS has a period that corresponds to a multiple of the whole number of a subframe and can be periodically transmitted or transmitted in a specific transmission pattern. In this case, the period or standard in which the CSI-RS is transmitted can be defined by an eNB.
[0135] For data demodulation, a DM-RS is transmitted in a dedicated way to a UE programmed in a corresponding time-frequency domain. That is, a DM-RS for a specific UE is transmitted only in the region in which the programming is carried out for the corresponding UE, that is, only in the time-frequency domain in which the data is received.
[0136] In order to measure a CSI-RS, a UE needs to be aware of the information on the transmission subframe index of the CSI-RS for each CSI-RS antenna port of a cell to which the UE belongs, the location of a resource element (RE) CSI-RS time-frequency within a transmission subframe and a CSI-RS sequence.
[0137] In the LTE-A system, an eNB must transmit a CSI-RS to each one of a maximum of eight antenna ports. The features used for CSI-RS transmission from different antenna ports must be orthogonal. When an eNB transmits CSI-RSs to different antenna ports, it can orthogonally allocate resources according to the FDM / TDM scheme by mapping the CSI-RSs to the respective antenna ports for different REs. Alternatively, CSI-RSs for different antenna ports can be transmitted according to the CDM scheme to map the CSI-RSs to parts of codes orthogonal to each other.
[0138] When an eNB notifies a UE that belongs to the eNB of information about a CSI-RS, first, the eNB needs to notify the UE of information about a time-frequency in which a CSI-RS for each antenna port is mapped. Specifically, the information includes subframe numbers in which the CSI-RS is transmitted or a period in which the CSI-RS is transmitted, a subframe deviation in which the CSI-RS is transmitted, a number of OFDM symbols in which the RE CSI-RS of a specific antenna is transmitted, frequency spacing, and the value of deviation or displacement of an RE on the geometric frequency axis.
[0139] A CSI-RS is transmitted through one, two, four or eight antenna ports. The antenna ports used in this case are p = 15, p = 15, 16, p = 15, ..., 18, and p = 15, ..., 22, respectively. A CSI-RS can be defined for only a subcarrier range Δf = 15 kHz.
[0140] In a subframe configured for CSI-RS transmission, a CSI-RS sequence is mapped to a complex value modulation symbol a_k, lA (p) used as a reference symbol on each antenna port p as in

[0141] In Equation 12, (k ', l') (where k 'is a subcarrier index within a resource block and l' indicates an OFDM symbol index within a partition.) And the condition of n_s is determined depending on a CSI-RS configuration, such as Table 3 or Table 4.
[0142] Table 3 illustrates the mapping of (k ', l') from a CSI-RS configuration to a normal PLC.



[0143] Table 4 illustrates the mapping of (k ', l') from a CSI-RS configuration on an extended PLC.


[0144] With reference to Table 3 and Table 4, in the transmission of a CSI-RS, in order to reduce intercellular interference (ICI) in a multicellular environment that includes a heterogeneous network environment (HetNet), a maximum of 32 different configurations (in the case of a normal PLC) or a maximum of 28 different configurations (in the case of an extended PLC) are defined.
[0145] The CSI-RS configuration is different depending on the number of antenna ports and a CP within a cell, and a neighboring cell can have a maximum of different configurations. In addition, the CSI-RS configuration can be divided into a case in which it is applied to both an FDD frame and a TDD frame and a case in which it is applied only to a TDD frame depending on a frame structure.
[0146] (k ', l') and n_s are determined depending on a CSI-RS configuration based on Table 3 and Table 4, and time-frequency resources used for CSI-RS transmission are determined depending on each port. CSI-RS antenna.
[0147] Figure 8 is a diagram illustrating features to which reference signals are mapped in a wireless communication system to which the present invention can be applied.
[0148] Figure 8 (a) shows twenty types of CSI-RS configurations available for CSI-RS transmission over one or two CSI-RS antenna ports, Figure 8 (b) shows ten types of CSI-RS configurations available for four CSI-RS antenna ports, and Figure 8 (c) shows five types of CSI-RS configurations available for eight CSI-RS antenna ports.
[0149] As described above, radio resources (ie, a pair of REs) on which a CSI-RS is transmitted are determined depending on each CSI-RS configuration.
[0150] If one or two antenna ports are configured for CSI-RS transmission in relation to a specific cell, the CSI-RS is transmitted over radio resources in a CSI-RS configuration configured from the twenty types of CSI-RS configurations shown in Figure 8 (a).
[0151] Likewise, when four antenna ports are configured for CSI-RS transmission in relation to a specific cell, a CSI-RS is transmitted over radio resources in a CSI-RS configuration configured from the ten types of CSI-RS configurations shown in Figure 8 (b). In addition, when eight antenna ports are configured for CSI-RS transmission in relation to a specific cell, a CSI-RS is transmitted over radio resources in a CSI-RS configuration configured from the five types of CSI-RS configurations shown in Figure 8 (c).
[0152] One CSI-RS for each antenna port is subjected to CDM for every two antenna ports (ie, {15.16}, {17.18}, {19.20} and {21.22}) on the same radio and broadcast resources. For example, in the case of antenna ports 15 and 16, complex CSI-RS symbols for the respective antenna ports 15 and 16 are the same, but are multiplied by different types of orthogonal code (for example, Walsh code) and mapped to the same radio resources. The complex CSI-RS symbol for antenna port 15 is multiplied by [1, 1], and the complex CSI-RS symbol for antenna port 16 is multiplied by [1 -1] and mapped to the same resources radio. The same goes for the antenna ports {17.18}, {19.20} and {21.22}.
[0153] A UE can detect a CSI-RS for a specific antenna port by multiplying the code by which a transmitted symbol has been multiplied. That is, a transmitted symbol is multiplied by the code [1-1] multiplied in order to detect the CSI-RS for the antenna port 15, and a transmitted symbol is multiplied by the code [1 -1] multiplied in order to detect the CSI-RS for antenna port 16.
[0154] With reference to Figure 8 (a) to 8 (c), in the case of the same index of CSI-RS configuration, radio resources according to a CSI-RS configuration that has a large number of antenna ports include radio features that have a small number of CSI-RS antenna ports. For example, in the case of a CSI-RS 0 configuration, radio resources for the number of eight antenna ports include both radio resources for the number of four antenna ports and radio resources for the number of one or two antenna ports. antenna.
[0155] A plurality of CSI-RS configurations can be used in a cell. 0 or one CSI-RS configuration can be used for a non-zero power (NZP) CSI-RS, and 0 or several CSI-RS configurations can be used for a zero power (ZP) CSI-RS.
[0156] For each bit set to 1 in a zero-power CSI-RS (ZP) ('ZeroPowerCSI-RS) which is a 16-bit bitmap configured by a high layer, a UE assumes zero transmit power in REs (except in a case where an ER overlays an ER assuming a CSI-RS NZP configured by a high layer) that corresponds to the four CSI-RS columns in Table 3 and Table 4. The most significant bit (MSB) corresponds to the index of the lowest CSI-RS configuration, and the next bits in the bitmap correspond sequentially to the next CSI-RS configuration indexes.
[0157] A CSI-RS is transmitted only on a downlink partition that satisfies the condition of (n_s mod 2) in Table 3 and Table 4 and a subframe that satisfies the CSI-RS subframe settings.
[0158] In the case of type 2 frame structure (TDD), a CSI-RS is not transmitted in a special subframe, a synchronization signal (SS), a subframe that collides against a PBCH or transmission of Message SystemInformationBlockType1 (SIB 1) or a subframe configured for transmitting a paging message.
[0159] In addition, an RE in which a CSI-RS for any antenna port that belongs to a set of antenna ports S (S = {15}, S = {15,16}, S = {17,18 }, S = {19.20} or S = {21.22}) is transmitted is not used for transmitting from a PDSCH or for transmitting CSI-RS from another antenna port.
[0160] The time-frequency resources used for CSI-RS transmission cannot be used for data transmission. Consequently, the data transfer rate is reduced as the CSI-RS overhead is increased. Considering this, a CSI-RS is not configured to be transmitted to each subframe, but it is configured to be transmitted in each transmission period that corresponds to a plurality of subframes. In that case, the CSI-RS transmission overhead can be significantly reduced compared to a case where a CSI-RS is transmitted to each subframe.
[0161] A subframe period (hereinafter referred to as a “CSI transmission period”) T_CSI-RS and a subframe deviation Δ_CSI-RS for CSI-RS transmission are shown in Table 5.
[0162] Table 5 illustrates CSI-RS subframe configurations.

[0163] With reference to Table 5, the transmission period CSI-RS T_CSI-RS and the subframe deviation Δ_CSI-RS are determined depending on the configuration of subframe CSI-RS I_CSI-RS.
[0164] The CSI-RS subframe configuration in Table 5 can be configured as one of the ‘SubframeConfig’ field and the ‘zeroTxPowerSubframeConfig’ field previously mentioned. The CSI-RS subframe configuration can be separately configured in relation to a CSI-RS NZP and a CSI-RS ZP.
[0165] A subframe that includes a CSI-RS satisfies Equation 13.

[0166] In Equation 13, T_CSI-RS means a CSI-RS transmission period, Δ_CSI-RS means a subframe offset value, n_f means a frame number and n_s means a partition number.
[0167] In the case of a UE in which transmission mode 9 has been configured in relation to a server cell, a CSI-RS resource configuration can be configured for the UE. In the case of a UE in which the transmission mode 10 has been configured in relation to a server cell, one or more CSI-RS resource configurations can be configured for the UE.
[0168] In the current LTE standard, a CSI-RS configuration includes an antenna port number (antennaPortsCount), a subframe configuration (subframeConfig) and a resource configuration (resourceConfig). Consequently, the CSI-RS configuration provides notification that a CSI-RS is transmitted over how many antenna ports, provides notification of the period and deviation of a subframe in which a CSI-RS will be transmitted, and provides notification that a CSI-RS is transmitted in which the location RE (that is, a frequency index and OFDM symbol) in a corresponding subframe.
[0169] Specifically, the following parameters for each CSI-RS configuration (resource) are configured through high-layer signaling.
[0170] - If transmission mode 10 has been configured, a CSI-RS resource configuration identifier
[0171] - A CSI-RS port number (antennaPortsCount): a parameter (for example, one CSI-RS port, two CSI-RS ports, four CSI-RS ports or eight CSI-RS ports) indicative of the number of ports antennas used for CSI-RS transmission
[0172] - A CSI-RS configuration (resourceConfig) (referring to Table 3 and Table 4): a parameter in relation to a CSI-RS allocation resource location
[0173] - A CSI-RS subframe configuration (subframeConfig, that is, I_CSI-RS) (referring to Table 5): a parameter in relation to the period and / or deviation of a subframe in which a CSI-RS will be transmitted
[0174] - If transmission mode 9 has been configured, the transmission power P_C for CSI feedback: in relation to the assumption of a UE for reference PDSCH transmission power for feedback, when the UE derives CSI feedback and adopts a value within of a range of [-8, 15] dB at a step size of 1 dB, P_C is assumed to be the energy ratio per resource element (EPRE) per PDSCH RE and an EPRE CSI-RS.
[0175] - If transmission mode 10 has been configured, the transmission power P_C for CSI feedback in relation to each CSI process. If CSI subframe sets C_CSI, 0 and C_CSI, 1 are configured by a high layer in relation to a CSI process, P_C is configured for each CSI subframe set in the CSI process.
[0176] - A pseudo-random sequence generator parameter n_ID
[0177] - If transmission mode 10 has been configured, a high-layer parameter 'qcl-CRS-Info-r11' that includes a QCL scrambling identifier for an almost colocalized UE assumption (QCL) type B (qcl-ScramblingIdentity - r11), a CRS port count (crs-PortsCount-r11) and a MBSFN subframe configuration list parameter (mbsfn-SubframeConfigList-r11).
[0178] When a CSI feedback value derived by a UE has a value within the range of [-8, 15] dB, P_C is assumed to be the ratio between EPRE PDSCH and EPRE CSI-RS. In this case, the EPRE PDSCH corresponds to a symbol in which the ratio between EPRE PDSCH and EPRE CRS is p_A.
[0179] A CSI-RS and a PMCH are not configured in the same subframe of a server cell at the same time.
[0180] In the type 2 frame structure, if four CRS antenna ports have been configured, a CSI-RS configuration index that belongs to the set [20 to 31] (referring to Table 3) in the case of a normal or a CSI-RS configuration index that belongs to the set [16 to 27] (referring to Table 4) in case an extended PLC is not configured in a UE.
[0181] A UE can assume that the CSI-RS antenna port of a CSI-RS resource configuration has a QCL relationship with delay spread, Doppler spread, Doppler shift an average gain and an average delay.
[0182] An UE in which transmission mode 10 and QCL type B have been configured can assume that antenna ports 0 to 3 that correspond to a CSI-RS resource configuration and antenna ports 15 to 22 that correspond to an CSI-RS resource configuration has QCL relationship with Doppler scattering and Doppler shift.
[0183] In the case of a UE in which the transmission modes 1 to 9 have been configured, a CSI-RS ZP resource configuration can be configured in the UE in relation to a server cell. In the case of a UE in which the transmission mode 10 has been configured, one or more CSI-RS ZP resource configurations can be configured in the UE in relation to a server cell.
[0184] The following parameters for a CSI-RS ZP resource configuration can be configured through high-layer signaling.
[0185] - The CSI-RS ZP configuration list (zeroTxPowerResourceConfigList) (referring to Table 3 and Table 4): a parameter in relation to a zero-power CSI-RS configuration
[0186] - The CSI-RS ZP subframe configuration (eroTxPowerSubframeConfig, that is, I_CSI-RS) (referring to Table 5): a parameter in relation to the period and / or deviation of a subframe in which a CSI-RS zero power is transmitted
[0187] A CSI-RS ZP and a PMCH are not configured in the same subframe of a server cell at the same time.
[0188] In the case of a UE in which the transmission mode 10 has been configured, one or more channel state information interference measurement (CSI-IM) configurations can be configured in the UE in relation to a server cell .
[0189] The following parameters for each CSI-IM resource configuration can be configured through high-layer signaling.
[0190] - The CSI-RS ZP configuration (referring to Table 3 and Table 4)
[0191] - the CSI RS ZP I_CSI-RS subframe configuration (referring to Table 5)
[0192] A CSI-IM resource configuration is the same as any of the configured CSI-RS ZP resource configurations.
[0193] A CSI-IM resource and a PMCH are not configured within the same subframe of a server cell at the same time. PROBE REFERENCE SIGNAL (SRS)
[0194] An SRS is mainly used for channel quality measurement to perform selective uplink frequency programming and is not related to the transmission of uplink data and / or control information. However, the present invention is not limited to this and the SRS can be used for a number of other purposes to increase power control or support various startup functions for recently unscheduled terminals. As an example of the initialization function, a modulation and initial coding scheme (MCS), initial data transmission power control, timing advance and semi-selective frequency programming can be included. In this case, semi-selective frequency programming refers to programming that selectively allocates frequency resources in a first partition of a subframe and that allocates frequency resources by jumping pseudo randomly to another frequency in a second partition.
[0195] In addition, the SRS can be used to measure a downlink channel quality under the assumption that the radio channels are reciprocal between the uplink and the downlink. The assumption is particularly effective in a time division duplexing (TDD) system in which the uplink and downlink share the same frequency spectrum and are separated in the time domain.
[0196] SRS subframes transmitted by a certain UE in a cell can be represented by a cell-specific broadcast signal. A 4-bit cell-specific ‘srsSubframeConfiguration’ parameter represents 15 available subframe arrays through which the SRS can be transmitted through each radio frame. The arrays provide flexibility for adjusting the SRS overhead according to a deployment scenario.
[0197] The 16 th matrix completely shuts down an SRS switch in the cell and this is mainly suitable for a server cell serving high-speed terminals.
[0198] Figure 9 illustrates an uplink subframe that includes a poll reference signal symbol in a wireless communication system to which the present invention can be applied.
[0199] With reference to Figure 9, the SRS is continuously transmitted in the last SC-FDMA symbol in the arranged subframe. Therefore, the SRS and DMRS are located on different SC-FDMA symbols.
[0200] PUSCH data transmission is not permitted in a specific SC-FDMA symbol for SRS transmission and as a result, when the polling overhead is the highest, that is, even if SRS symbols are included in all subframes, the polling overhead does not exceed approximately 7%.
[0201] Each SRS symbol is generated by a basic sequence (random sequence or a sequence defined based on Zadoff-Ch (ZC)) for a given time unit and frequency band, and all terminals in the same cell use the same basic sequence. In that case, SRS transmissions from a plurality of UEs in the same cell at the same time in the same frequency band are orthogonal by different cyclical deviations from the basic sequence, and are distinguished from each other.
[0202] When assigning different basic sequences to the respective cells, the SRS sequences from different cells can be distinguished, however the orthogonality between different basic sequences is not guaranteed.
[0203] As more and more communication devices require greater communication capacity, there is a need for improved mobile broadband communication compared to existing radio access technology (RAT). Mass machine-type communications (MTCs), which provide multiple services anytime and anywhere by connecting many devices and objects, are one of the biggest problems to consider in next generation communication. In addition, a communication system design that considers a service / UE sensitive to reliability and latency is being discussed.
[0204] The introduction of next generation radio access technology that considers advanced mobile broadband communication, mass MTC, low-latency and ultra-reliable communication (URLLC) is discussed, and in the present invention, the technology is called new RAT for the sake of convenience. SELF-SUFFICIENT SUB-FRAMEWORK STRUCTURE
[0205] Figure 10 is a diagram illustrating a self-contained subframe structure in the wireless communication system to which the present invention can be applied.
[0206] In a TDD system, in order to minimize data transmission latency, a new 5th generation (5G) RAT considers a self-sufficient subframe structure, as shown in Figure 10.
[0207] In Figure 10, a dashed area (symbol index of 0) indicates a downlink control area (DL) and a black area (symbol index of 13) indicates an uplink control area (UL) . An unmarked area can also be used for DL data transmission or for UL data transmission. Such a structure is characterized by the fact that DL transmission and UL transmission are sequentially performed in a subframe, and DL data is transmitted in a subframe, and ACK / NACK UL can also be received. As a result, it takes less time to retransmit data when a data transmission error occurs, thereby minimizing the final data transmission latency.
[0208] In such a self-contained subframe structure, there is a need for a time interval between the base station and the UE for the process of converting from the transmission mode to the receiving mode or from the receiving mode to the transmission mode. For this purpose, some of the OFDM symbols at the time of switching from DL to UL in the self-contained subframe structure are configured for a guard period (GP). ANALOGUE BEAM TRAINING
[0209] In a millimeter wave (mmW), a wavelength is shortened, so that a plurality of antenna elements can be installed in the same area. That is, a total of 64 (8x8) antenna elements can be installed in a two-dimensional array over a range of 0.5 lambda (ie, wavelength) on a 4 X 4 (4 by 4) panel cm with a wavelength of 1 cm in a 30 GHz band. Therefore, in mmW, it is possible to increase a beam formation gain (BF) to increase the coverage or to increase the transfer rate with the use of multiple elements of antenna.
[0210] In this case, if a transceiver unit (TXRU) is provided so that the power and transmission phase can be adjusted for each antenna element, independent beam formation is possible for each frequency resource. However, when TXRUs are installed on all 100 antenna elements, there is a problem that the effectiveness is deteriorating in terms of costs. Therefore, a method of mapping a plurality of antenna elements in a TXRU and adjusting a beam direction using an analog phase shifter is considered. Such an analog BF method has a disadvantage that frequency selective BF can be performed by making only one beam direction in all bands.
[0211] A hybrid BF with TXRUs B, which is an intermediate form of digital BF and analog BF, and less than Q antenna elements, can be considered. In this case, although there is a difference depending on a connection method of TXRUs B and antenna elements Q, the number of beam directions that can be transmitted at the same time is limited to B or less.
[0212] Hereafter, representative examples of a method of connecting TXRUs and antenna elements will be described with reference to the accompanying drawings.
[0213] Figure 11 shows a model of transceiver unit in a radio communication system to which the present invention can be applied.
[0214] A TXRU virtualization model shows a relationship between an output signal from TXRUs and an output signal from antenna elements. According to the correlation between the antenna element and the TXRU, the TXRU model can be divided into the TXRU option 1 virtualization model and a submatrix split model as illustrated in Figure 11 (a) and TXRU option 2 virtualization model and a full connection model, as shown in Figure 11 (b).
[0215] With reference to Figure 11 (a), in the case of the submatrix partition model, the antenna element is divided into multiple groups of antenna elements and each TXRU is connected to one of the groups. In this case, the antenna element is connected to only one TXRU.
[0216] With reference to Figure 11 (b), in the case of the total connection model, the signals from multiple TXRUs are combined and transmitted to a single antenna element (or an array of antenna elements). That is, a schematic is illustrated, in which the TXRU is connected to all antenna elements. In this case, the antenna element is connected to all TXRUs.
[0217] In Figure 11, q represents a transmission signal vector of antenna elements that have M co-polarized waves in one column. w represents a broadband TXRU virtualization weight vector and W represents a phase vector multiplied by an analog phase shifter. In other words, the analog beamforming direction is determined by W. x represents a signal vector of M_TXRU TXRUs.
[0218] In this document, the mapping of antenna ports and TXRUs can be 1 to 1 or 1 to many.
[0219] In Figure 11, the mapping (mapping from TXRU to element) between and TXRU and the antenna element is merely an example, and the present invention is not limited to that. The present invention can be similarly applied even for the mapping between the TXRU and the antenna element, which can be implemented in several other ways in terms of hardware. RETALIMENTATION OF CHANNEL STATE INFORMATION (CSI)
[0220] In an LTE / LTE-A 3GPP system, user equipment (UE) is defined to report channel status information (CSI) to a base station (BS or eNB).
[0221] CSIs collectively refer to information that can indicate the quality of a radio channel (or called a link) formed between the UE and the antenna port. For example, a rating indicator (RI), a pre-coding matrix indicator (PMI), a channel quality indicator (CQI), and the like correspond to the information.
[0222] Here, the RI represents classification information for a channel, which means the number of streams received by the UE through the same time-frequency resource. Since this value is determined depending on the fading of the channel, the value is fed back from the UE to the BS with a period generally longer than the PMI and CQI. The PMI is a value that reflects a channel space characteristic and represents a preferential pre-coding index by the UE based on a metric, such as signal-interference-to-noise ratio (SINR). The CQI is a value that represents the intensity of the channel, and generally refers to a SINR reception that can be obtained when the BS uses the PMI.
[0223] In the LTE / LTE-A 3GPP system, BS configures a plurality of CSI processes for the UE and can receive CSI for each process. Here, the CSI process consists of a CSI-RS for measuring signal quality from the BS and a CSI interference measurement feature (CSI-IM) for measuring interference. VIRTUALIZATION OF REFERENCE SIGN (RS)
[0224] In mmW, it is possible to transmit a PDSCH in only one analog beam direction at a time by means of analog beam formation. In this case, data transmission from the BS is only possible for a small number of UEs in the corresponding direction. Therefore, if necessary, the analog beam direction is configured differently for each antenna port so that data transmission can be carried out simultaneously to a plurality of UEs in different analog beam directions.
[0225] Figure 12 is a diagram illustrating a service area for each transceiver unit in the wireless communication system to which the present invention can be applied.
[0226] In Figure 12, 256 antenna elements are divided into 4 parts to form 4 submatrices, and the connection structure of the TXRU to the submatrix will be described as an example, as shown in Figure 11 above.
[0227] When each submatrix consists of a total of 64 (8x8) antenna elements in the form of a two-dimensional array, the specific analog beam formation can cover an area corresponding to a 15 degree horizontal angle area and a vertical angle area of 15 degrees. That is, the zone in which the BS must be cut is divided into a plurality of areas, and services are provided one by one at a time.
[0228] In the following description, it is assumed that the CSI-RS antenna ports and TXRUs are mapped 1 to 1. Therefore, the antenna port and TXRU have the same meaning as the following description.
[0229] As shown in Figure 12 (a), if all TXRUs (antenna ports, submatrices) (ie TXRU 0, 1, 2, 3) have the same analog beamforming direction (ie, region 1), the transfer rate of the corresponding zone can be increased by forming the digital beam with the highest resolution. In addition, it is possible to increase the transfer rate of the corresponding zone by increasing the classification of the transmission data for the corresponding zone.
[0230] As shown in Figure 12 (b) and 12 (c), if each TXRU (antenna port, submatrix (ie TXRU 0, 1, 2, 3) has a different analog beamforming direction (or that is, region 1 or region 2, data can be transmitted simultaneously to UEs distributed over a wider area in the subframe (SF).
[0231] As an example shown in Figures 12 (b) and 12 (c), two of the four antenna ports are used for PDSCH transmission for UE1 in region 1 and the remaining two antenna ports are used for PDSCH transmission for UE2 in region 2.
[0232] In particular, in Figure 12 (b), the PDSCH1 transmitted to the UE1 and the PDSCH2 transmitted to the UE2 represent examples of spatial division multiplexing (SDM). Unlike this, as shown in Figure 12 (C), the PDSCH1 transmitted to the UE1 and the PDSCH2 transmitted to the UE2 can also be transmitted by frequency division multiplexing (FDM).
[0233] Between a service plan for one area using all the antenna ports and a service scheme for many areas at the same time when dividing the antenna ports, a preferred scheme is changed according to the classification and the modulation and coding scheme (MCS) that serves the UE to maximize the cell throughput. In addition, the preferred method is changed according to the amount of data to be transmitted to each UE.
[0234] BS calculates a cell transfer rate or programming metric that can be obtained when an area is served using all the antenna ports, and calculates the cell transfer rate or programming metric that can be obtained obtained when two areas are served by dividing the antenna ports. BS compares the cell throughput or programming metric that can be obtained for each scheme to select the final transmission scheme. As a result, the number of antenna ports participating in the PDSCH transmission is changed by SF by SF. In order for the BS to calculate the transmission MCS of the PDSCH according to the number of antenna ports and to reflect the calculated MCS transmission for a programming algorithm, CSI feedback from the appropriate UE is required. BEAM REFERENCE SIGN (BRS)
[0235] The beam reference signals are transmitted over one or more antenna ports (p = {0, 1, ..., 7}).
[0236] The reference signal sequence 'r_l (m)' can be defined by Equation 14 below.

[0237] Where l = 0, 1, ..., 13 is the number of OFDM symbols. N_RBAmax, DL represents the largest downlink band configuration and N_scARB is expressed by a multiple. N_scARB represents the size of the resource block in the frequency domain and is expressed by the number of subcarriers.
[0238] In Equation 14, c (i) can be predefined as a pseudo-random sequence. The pseudo-random sequence generator can be initialized at the beginning of each OFDM symbol using Equation 15 below.

[0239] Where N_IDAcell represents a physical layer cell identifier. n_s = floor (l / 7) and floor (x) represent a floor function to derive a maximum integer from x or less. l '= l mod 7 and mod represent a module operation. BEAM REFINING REFERENCE SIGN (BRRS)
[0240] The beam refinement reference signals (BRRSs) can be transmitted up to eight antenna ports (p = 600, ..., 607). BRRS transmission and reception are dynamically programmed in the allocation of downlink resource in xPDCCH.
[0241] The sequence of reference signals 'r_l, ns (m)' can be defined by Equation 16 below.

[0242] Where n_s represents the number of partitions in the radio frame. l represents the number of OFDM symbols in the partition. c (i) can be predefined as the pseudo-random sequence. The pseudo-random sequence generator can be initialized at the beginning of each OFDM symbol using Equation 17 below.

[0243] In this document, N_IDABRRS is configured for the UE through the RRC signaling. DL PHASE NOISE COMPENSATION REFERENCE SIGN
[0244] The phase noise compensation reference signals associated with xPDSCH can be transmitted on the antenna port (or ports) p = 60 and / or p = 61 according to the signaling in the DCI. In addition, the phase noise compensation reference signals associated with xPDSCH can be present as a valid reference for phase noise compensation only if the xPDSCH transmission is associated with the corresponding antenna port. In addition, the phase noise compensation reference signals associated with xPDSCH can be transmitted only in the physical resource blocks and symbols by which the corresponding xPDSCH is mapped. In addition, the phase noise compensation reference signals associated with xPDSCH can be identical across all symbols with xPDSCH allocation.
[0245] For any antenna port pe {60,61}, the reference signal sequence 'r (m)' is defined by Equation 18 below.

[0246] In this document, c (i) can be predefined as the pseudo-random sequence. The pseudo-random sequence generator can be started at the beginning of each subframe using Equation 19 below.

[0247] Where n_SCID is 0 unless otherwise specified. In xPDSCH transmission, n_SCID is given in a DCI format associated with xPDSCH transmission.
[0248] n_IDA (i) (where i = 0, 1) is given as follows. When the value of n_IDAPCRS, i is not provided by the upper layer, n_IDA (i) is equal to N_IDAcell. Otherwise, n_IDA (i) is equal to n_IDApCRS, i.
[0249] The following techniques are discussed for multiple uplink (UL) multiple inputs (UL) of new RAT (NR).
[0250] i) Uplink transmission / reception schemes for data channels
[0251] - UL MIMO based on non-reciprocity (for example, based on PMI)
[0252] - UL MIMO based on reciprocity (for example, the UE derives the pre-encoder based on RS downlink measurement (including partial reciprocity)
[0253] - Multi-user support (MU) -MIMO
[0254] - Spatial multiplexing of open loop / single closed loop / multipoint (SM)
[0255] For example, for multipoint SMs, multilayers are received jointly or independently by different reception and transmission points (TRPs).
[0256] For multipoint SM, multiple points can be coordinated.
[0257] - Spatial diversity of single / multiple panels
[0258] - Switching antenna / uplink panel (EU side)
[0259] - UL beam formation management for analog implementation
[0260] - Combination of the above techniques
[0261] ii) RS UL project that considers the functions below
[0262] - Survey
[0263] - Demodulation
[0264] - Phase noise compensation
[0265] iii) UL transmission power advance / timing control in the context of UL MIMO
[0266] iv) Transmission scheme (s) for carrying UL control information
[0267] v) Other UL MIMO and related techniques are not limited.
[0268] The following aspects for UL MIMO transmission must be supported:
[0269] i) Schemes / methods of transmission for reciprocated calibrated UEs, non-reciprocated calibrated UEs and cases of partial non-reciprocity / reciprocity
[0270] - If necessary, the signal associated with the operation based on UL reciprocity is introduced. For example, EU capability that indicates calibration accuracy
[0271] - The possibility of differentiating uncalibrated UEs by reciprocity from non-reciprocity or should not be discussed.
[0272] - The number of transmission schemes / methods can be discussed.
[0273] ii) At least one of the following candidate schemes / methods must be supported.
[0274] - Candidate 1: Transmission based on a codebook
[0275] Frequency selective and frequency selective non-coding in the digital domain can be considered for a system wide bandwidth. Support for frequency selective pre-coding is determined according to the decision on NR waveform (s). The value of the system's bandwidth will be discussed later.
[0276] For example, base station (BS) based which is analogous to LTE
[0277] For example, EU-assisted and BS-centered mechanism: The UE recommends candidate UL pre-encoders from a predefined BS code book based on the DL RS measurement. In addition, BS determines the final pre-encoder obtained from the codebook.
[0278] For example, EU-centered and BS-assisted mechanism: BS provides CSI (for example, channel response, interference-related information) to the UE. In addition, the UE determines the final precoder based on the information from the BS.
[0279] - Candidate 1: Transmission not based on a codebook
[0280] Frequency selective and frequency selective non-coding in the digital domain can be considered for the system broadband. Support for frequency selective pre-coding is determined according to the decision on NR waveform (s). The value of the system's bandwidth will be discussed later.
[0281] For example, transmission based on reciprocity (based on DL RS) only for calibrated UEs
[0282] For example, EU-assisted and BS-centered mechanism: The UE recommends candidate UL pre-encoders for BS based on the DL RS measurement. In addition, BS determines the final precoder.
[0283] For example, mechanism centered on UE and aided by BS: BS provides CSI (for example, channel response, information related to interference) to the UE. In addition, the UE determines the final precoder based on the information from the BS.
[0284] - Other transmission schemes / methods are not limited.
[0285] i) Discussion of UL pre-encoder signaling for frequency selective / frequency non-selective pre-coding
[0286] - Example 1: Signaling of single or multiple PMIs through control channels and / or DL data
[0287] Multiple PMIs can be signaled via a single DCI or multi-level DCI (the 1st level DCI contains an indication for the 2nd level DCI).
[0288] - Example 2: For TDD, the pre-encoder calculation in the UE based on the DL RS
[0289] The implementation of frequency selective pre-coding is determined according to the RAN1 decision (for example, NR frame structure, waveform (s)).
[0290] An influence on other aspects of system design (for example, DL control channel decoding performance / complexity) must be considered.
[0291] ii) Discussion of the use of frequency-selective UL pre-encoding for pre-encoded transmission including pre-encoder cycle
[0292] iii) For frequency selective pre-coding, the discussion of UL pre-coding granularity (ie UL sub-band size) considers the following aspects
[0293] - Implicit (defined by specification) or explicit (by eNB / EU decision) signaling support
[0294] - The possibility of aligning with the DL
[0295] iv) The assessment should include specific aspects of UL, such as cubic metric analysis (CM) according to the UL waveform, etc.
[0296] v) Frequency non-selective pre-coding discussion is of the highest priority.
[0297] In the existing LTE standard, when a base station transmits an uplink grant (UL) for the UL MIMO transmission from a UE (for example, by DCI format 4) to the UE, the base station transmits pre- coding (for example, included in the DCI format) together. Consequently, the UE carries out the UL transmission by applying the indicated pre-encoder (single broadband) to the programmed physical resource block (s) (PRB (s)).
[0298] As described above, a method for instructing a frequency selective precoder even at UL is also considered. As a result, it is possible to improve the transmission field performance by applying a more optimized UL pre-encoder for each subband.
[0299] However, unlike DL, the UL needs to directly instruct the subband pre-encoder at the time of granting the base station UL, which can cause an excessive control channel overhead proportional to the number of subbands.
[0300] Therefore, the present invention proposes schemes to apply UL subband precoding while minimizing UL related DCI overhead.
[0301] In the present invention, a specific UL pre-encoder 'P' is basically described to be divided into a type of P = U1 * U2 and the like. Here, it can be divided into U1 as a relative broadband (and / or long term) pre-encoder attribute and U2 as a relative (and / or short term) pre-encoder attribute.
[0302] However, the present invention is not limited to this, and the operation of the present invention to be described below can be performed based on a single PMI (for example, TPMI) and a precoder.
[0303] A method is provided in which U1 information is indicated as being common in all sub-bands and only U2 information is indicated for each sub-band to be instructed to the UE at the time of UL programming (or in association with UL programming).
[0304] For example, assuming that a complete P has 6 bits, U1 has 4 bits, and U2 has 2 bits, 6 bits are allocated to each subband without applying the hierarchical structure proposed in the present invention. If the total number is N, a total of 6N bits is consumed in the corresponding UL pre-encoder instruction. On the other hand, according to the proposed method of the present invention, once 6 + 2N bits are consumed, the number of subbands N increases, thereby contributing to the reduction of a control channel overhead.
[0305] In this specification, for the sake of convenience of description, a geometry axis feature unit of specific frequency is referred to as the “subband”, but the present invention is not limited to this, and it should be understood that the “subband” is commonly referred to as the frequency-specific geometry axis resource unit. For example, the term of the sub-band can be changed / mixed in all / some description of the present invention, such as group RB, PRB, PRB (for example, PRG (Group PRB)). LIST OF INFORMATION U1
[0306] For an environment (for example, similar to an open loop method, a case where a terminal speed is high, etc.) where it is advantageous to selectively instruct widely spaced beams for each subband, rather than an environment in which it is advantageous to selectively instruct the closely spaced beam for each subband due to channel characteristics, a U1 codebook can also be configured as a widely spaced beam.
[0307] In the example described above, 4 bits of U1 means that a total of 16 different U1 information can be indicated. Each U1 information can include specific beam vectors to be selected in U2. As an example, each U1 can consist of a set of discrete Fourier transform (DFT) vectors as much as the number of UL broadcast antenna ports in the UE (for example, the number of ports can be transmitted in advance by the UE in an SRS form).
[0308] In this case, each U1 index can be designed as a group of closely spaced bundles. As a result, it is advantageous for the base station to instruct UL programming when configuring U1 via the peripheral candidate beam vectors that include a specific beam direction that intends to instruct the corresponding UE at the time of UL programming. That is, since U1 is the relative broadband pre-encoder attribute, it is advantageous that the beams select / instruct the optimized final beam for each subband to be stored in U1, and each U1 information must be projected in a way that an effect can be roughly displayed.
[0309] In the present invention, it is possible to define / configure at least one different codebook, such as a "group of closely spaced beams", a "group of widely spaced beams" and / or a "composite group of beams in a specific way (for example, configurable by eNB). In addition, the base station can configure / instruct which code book U1 and / or U2 the UE needs to apply at the time of UL programming (for example, by DCI) or separate the signaling before UL programming. As a result, although such a U1 codebook itself can be fixed as one, like the present invention, there is an advantage that a more flexible codebook can be operated by supporting a change / activate / reactivate function when configuring / instructing the base station. LIST OF INFORMATION U2
[0310] In the example described above, 2 bits of U1 means that a total of 4 different U2 information can be indicated. Each U2 information can be configured in a way that a group that corresponds to the U1 index indicated above can include four specific beam vectors and the 2-bit U2 selection index indicates which beam among the beams must finally be applied for each subband.
[0311] Furthermore, in the example described above, when U1 has 4 bits, U2 can exceed 2 bits. For example, if U2 has 4 bits, 2 bits are allocated as a “beam selector” so that four different U2 information can be displayed. In order to connect the corresponding beam in the form of phase (for example, QPSK (Quadrature Phase Shift Switching) "phase")), 2 bits can be allocated and, in this way, the total U2 can be configured as 4 bits . The matching is configured in the form of crossed polarized antennas between the groups (two) of the specific UE antenna port and the same beam can be applied in order to configure a precoder in the form of matching when applying a phase of group between the same door groups.
[0312] Alternatively, it is clear that "matching" can allocate only 1 bit to apply, for example, BPSK matching and the bit width of the "beam selector" can be modified / changed according to the antenna port configuration transmission lines and the U1 / U2 codebook structure.
[0313] U2 information is mapped / displayed for each subband, and can be configured / displayed together by interlocking with the UL (RA) resource allocation field programmed for the corresponding UE.
[0314] For example, if the resource allocation information from the corresponding UL grant message is in the form of a specific PRB bitmap (for example, if each bit is '1', the corresponding PRB is included in the PRB programmed and if each bit is '0', the corresponding PRB is not included), the structure can be extended to store K bit information for each PRB index without using a '1' or '0' bitmap. That is, the information can correspond to a PRB for each K bit in the bitmap. Thus, in a modality of the present invention, a structure is proposed to transmit U2 information through the corresponding 2AK state for each PRB.
[0315] For example, if K = 2, a specific default state can be defined / configured for each PRB as follows.
[0316] - '00' indicates that “the corresponding PRB is not included in the programmed PRB”
[0317] - '01' indicates that “the corresponding PRB is included in the programmed PRB and the first precoder in U1 is applied”
[0318] - '10' indicates that “the corresponding PRB is included in the programmed PRB and the second precoder in U1 is applied”
[0319] - '11' indicates that “the corresponding PRB is included in the programmed PRB and the third precoder in U1 is applied”
[0320] Such a coding method is just an example, and the status description, such as '01', '10' and '11' can be defined differently or the base station can be changed / configured by a signal higher layer, such as RRC signaling. As described above, when the status description is defined / supported in the form of parameters configurable by the base station (for example, by RRC signaling), it is advantageous that the configuration flexibility of the base station can be increased.
[0321] Thus, as the programming information and U2 information are encoded together in a bitmap, it is possible to reduce signaling overhead compared to the case of configuring a bitmap to transmit the information and a bitmap to transmit U2 information, respectively.
[0322] In addition, the RA field is maintained as a 1-bit unit bitmap, and can be applied even in the form that a bitmap in K bit units to transmit U2 information by subband ( by PRB / PRG) is provided as a separate field (or separately provided (at an independent time) as a separate DCI). That is, a separate field that indicates K bit (U2) precoder information for each subband corresponding to a specific PRB (s) in the programmed PRB area indicated in the RA field can be defined / configured.
[0323] Operation ratio associated with the specific uplink reference signal (RS UL) (for example, SRS) (for Link Adaptation (LA)
[0324] - In association with some of the operations proposed in the present invention, a specific RS transmission (for example, SRS) can be configured / implemented by the UE in order to determine the pre-encoder at the base station.
[0325] Henceforth, for the sake of convenience of description, the uplink RS is called SRS, however, the present invention is not limited to this.
[0326] 1) UE UL-LA Type 1 (UL-LA process operation when starting pre-coded SRS transmission):
[0327] Such an SRS can first be set / configured to transmit a specific pre-encoded SRS. In this case, the base station measures the pre-coded SRS of the specific port (s) to determine the proposed U1 and / or U2 information. Thereafter, the base station transmits a UL programming grant (for example, in the case of U1, it can be separately transmitted to the UE via a DCI (field) or a separate message container for delivery of specific control information (by signaling) L1 and / or L2) including the determined U1 and / or U2 information, consequently, the frequency selective UL-MIMO programming considered in the present invention is revealed.
[0328] A type in which a UL link adaptation process (UL-LA) is initiated by initiating the transmission of pre-encoded SRS without (that is, omitting) the transmission procedure of the specific non-precoded SRS can be called an UL-LA Type 1 (or EU) operation.
[0329] That is, the UE can transmit pre-encoded / beam-formed SRS ports, for example, analog beam formation in a specific direction through the corresponding specific pre-encoded SRS. In addition, the base station measures the SRS ports formed by beams (analog) to derive appropriate U1 and / or U2 and then informs the derived U1 and / or U2 to the UE using the method described above to apply the UL transmission .
[0330] More specifically, the corresponding beam-forming vectors / coefficients to be applied to the pre-encoded / beam-formed SRS by the UE can be determined as follows. First, the UE can measure a DL-specific RS (for example, radio resource management RS (RRM-RS), BRS, BRRS, etc.) transmitted by the base station. In addition, the UE finds (and also reports) the best “server beam” to determine the best “Rx reception beam” (paired) from the UE itself. Then, the UE can transmit the SRS by applying the corresponding beam formation vectors / coefficients, by transmitting the pre-coded / beam-formed SRS, by inverting (for example, obtaining Hermitian) the best “receiving beam Rx” using the DL / UL channel reciprocity feature. That is, the SRS transmission can be performed with the same spatial filtering as the spatial filtering used to receive a specific DL RS (for example, the best "server beam"). The operation of the UE can be defined in advance or configured in the HUH.
[0331] Alternatively, it is not necessary to apply only the "receiving beam Rx" which corresponds to the best "server beam". For example, the operation can be supported so that the base station can instruct / trigger pre-encoded / beam-formed SRS transmissions by applying the “receiving beam Rx” which corresponds to the second best “server beam”.
[0332] Such a method is generalized and, therefore, in the same way that it corresponds to a better third “server beam”, which corresponds to a better fourth “server beam”, ..., a specific identifier (for example, information beam state (BSI), etc.) can be instructed from the base station in order to recognize the corresponding nth “server beam”. In such a way, the vectors / beam formation coefficients to be applied by the UE, when transmitting the pre-coded / formed by bundles SRS, can be configured / indicated.
[0333] In other words, the UE can transmit the vectors / beam formation coefficients using the same spatial filtering as the spatial filtering used to receive the specific DL RS when transmitting the SRS. That is, the UE can implement spatial filtering which is ideal for receiving DL RS for each DL RS, and the base station can instruct the UE to carry out the transmission of a specific SRS resource using the same spatial filtering as the filtering used by the UE to receive a specific DL RS.
[0334] Alternatively, a method for directly configuring / instructing, via the base station, beam formation vectors / coefficients to be applied by the UE when transmitting the pre-coded SRS to the UE can be applied (for example, a case where the base station can acquire the information based on channel reciprocity, for example, according to another specific method and the like). The base station can directly report the vectors / beamforming coefficients to the UE through a control channel, such as a specific DCI that triggers the transmission of the corresponding pre-coded SRS or through a specific layer 1 (L1 signaling) ), layer 2 (L2) and / or layer 3 (L3) separated (for example, semi-static by RRC).
[0335] As a result, the UE UL-LA Type 1 to which the operation is applicable may be limited to i) “UE calibrated by channel reciprocity (for example, NR (or 5G) UE, 3GPP version 15 and later UEs, etc.) ”, ii)“ UE that does not perform all digital beamforming on the transmitter (TX) (and / or transmitter and receiver antennas / ports (TRX)) of the UE ”, iii)“ UE that applies analog beamforming to TX UL ports ”, and / or iv)“ UE operating in TDD ”.
[0336] In addition / alternatively, the UE provides its own specific capability (for example, whether Type 1 related support is available or not, etc.) associated with the base station in advance and thus the above operation / process can be configured / started.
[0337] 2) UE UL-LA Type 2 (UL-LA process operation when starting pre-coded SRS transmission):
[0338] In relation to such an SRS, the UE can be set / configured to transmit a non-pre-coded SRS. In this case, the base station measures the non-pre-coded SRS of the specific port (s) to determine the proposed U1 and / or U2 information. Thereafter, the base station transmits a UL programming grant (for example, in the case of U1, it can be separately transmitted to the UE via a DCI (field) or a separate message container for delivery of specific control information (by signaling) L1 and / or L2) including the determined U1 and / or U2 information, consequently, the frequency selective UL-MIMO programming considered in the present invention is revealed.
[0339] Thus, a type, in which a UL link adaptation process (UL-LA) is initiated only by transmitting a specific non-pre-encoded SRS and the base station informs the final UL pre-encoder, such as U1 and / or U2, etc. determined by measuring the non-pre-coded SRS of the UE-specific port (s) during UL programming, it is called a UL-LA Type 2 (or UE) operation.
[0340] More specifically, this Type 2 UE can mean the UE in which the UE antennas / TX (and / or TRX) ports of the UE are formable by fully digital beams.
[0341] As a result, the UE UL-LA Type 2 to which the operation is applicable may be limited as i) “EU not calibrated by channel reciprocity” (eg EU LTE / LTE-A, EU up to 3GPP version 14) ), ii) “Full digital beam forming EU possible”, and / or iii) “EU operating in FDD (and / or TDD)”, etc.
[0342] In addition / alternatively, the UE provides its own specific capability (for example, whether Type 2 related support is available or not, etc.) associated with the base station in advance and thus the above operation / process can be configured / started.
[0343] 3) UE UL-LA Type 3 (UL-LA process operation when receiving beamforming information specific to the base station when initiating (S1 ports) non-pre-coded SRS transmission and initiating ports (S2 (< = S1)) pre-coded SRS transmission when applying the received information
[0344] Alternatively, in relation to such SRS, the UE can be configured / indicated to transmit a specific non-pre-coded SRS (ports S1) mainly (with a long term) by the UE so that the base station derives vectors / primary beam formation coefficients. In addition, the base station instructs the vectors / beamforming coefficients for the UE to transmit a specific pre-coded SRS (ports S2 (<= S1)). In this case, there is only one difference in the fact that a coarse beam estimation operation by the primary non-pre-coded SRS is added. In other words, the base station measures the pre-coded SRS (ports S2 (<= S1)) to determine the proposed U1 and / or U2 information. Thereafter, the base station transmits a UL programming grant (for example, in the case of U1, it can be separately transmitted to the UE via a DCI (field) or a separate message container for delivery of specific control information (by signaling) L1 and / or L2) including the determined U1 and / or U2 information, consequently, the frequency selective UL-MIMO programming considered in the present invention is revealed.
[0345] At that time, as a method for configuring / instructing the UE to apply the derived beam formation vectors / coefficients (when receiving the non-pre-coded SRS at the base station) to the corresponding pre-coded SRS, the base station can directly inform the vectors / beamforming coefficients to the UE through a control channel, such as a specific DCI that triggers the transmission of the corresponding pre-coded SRS or separately specific L1, L2 and / or L3 signaling (for example , semi-static by RRC).
[0346] Thus, a type, in which the transmission of a specific non-pre-coded SRS is included and the transmission of a specific pre-coded SRS is initiated when receiving information related to the application of the beamforming from the station base and apply the received information, and the base station informs the final UL pre-encoder, such as U1 and / or U2, etc. determined by measuring the pre-coded SRS to the UE when UL programming is called an UL-LA Type 3 (or UE) operation.
[0347] More specifically, this Type 3 UE can mean the UE in which the UE antennas / TX (and / or TRX) ports of the UE are entirely formed by digital beams.
[0348] As a result, UE UL-LA Type 2 to which the operation is applicable may be limited as i) “EU not calibrated by channel reciprocity”, ii) “EU that does not carry out beam formation fully typing on the antennas / ports TX (and / or TRX) of the UE ”, iii)“ UE that applies analog beamforming to the UL UL ports ”, and / or iv)“ UE that operates in FDD (and / or TDD) ”.
[0349] In addition / alternatively, the UE provides its own specific capability (for example, whether Type 3 related support is available or not, etc.) associated with the base station in advance and thus the above operation / process can be configured / started.
[0350] - In addition / alternatively, a specific resource SRS (s) is configured in advance in the UE, and the UE can be configured to transmit a separate pre-coded SRS based on each SRS resource configuration. At that time, the number of SRS ports per SRS resource can be one or more.
[0351] That is, the UE can perform SRS transmission based on the number of SRS ports that corresponds to each SRS resource and corresponding configuration.
[0352] At that moment, the beam formation vectors / coefficients to be applied at that moment are selected arbitrarily (eNB transparently, randomly) or selected according to the indication of the base station and the UE can transmit the pre-coded SRS for each SRS resource. In this case, the base station first selects an SRS resource with the highest reception quality through SRS measurement for each SRS resource and derives U1 and / or U2 in relation to the SRS ports on the SRS resource and indicates U1 and / or U2 for the UE. That is, the base station derives the U1 and / or U2 to be applied to the SRS ports on the corresponding SRS resource to indicate the derived U1 and / or U2 for the UE.
[0353] In this case, a UL programming grant (for example, U1 and / or SRI) that includes not only the proposed U1 and / or U2 information, but also the best SRS resource indicator (for example, U1 and / or SRI can be separately transmitted to the UE via a separate DCI (field) or a separate message container to transmit specific control information (via L1, L2 and / or L3 signaling (for example, semi-static by RRC))) is transmitted. Consequently, a frequency-selective UL-MIMO programming considered in the present invention is disclosed.
[0354] In other words, the base station configures multiple SRS resources for the UE, and the UE can transmit a pre-encoded SRS that has different beam directions for each SRS resource to the base station. In addition, the base station informs the UE about granting uplink programming (DCI) which includes the SRI and the pre-coding indication (for example, U1 and / or U2, or transmitted pre-coding matrix indicator) (TPMI)) transmitted by the UE at the previous time instance. In this case, the pre-encoding indication can be used to indicate the preferred pre-encoder through the SRS ports on the SRS resource selected by SRI.
[0355] For example, if a specific SRS resource is configured to transmit a 1-port SRS, when the UE implements X transmit antenna (s) / port (s), the UE can be set / configured to transmit a type of “Pre-coded SRS of classification 1” when applying X for 1 vectors / beam formation coefficients.
[0356] Similarly, if a specific SRS resource is configured to transmit a v (> 1) port SRS, when the UE implements X (> = v) transmission antenna (s) / port (s), the UE can be set / configured to transmit a type of “pre-coded SRS of classification v” when applying X by v vectors / beam formation coefficients.
[0357] That is, there may be a “SRS port number = classification (target) number” feature configured for each SRS resource.
[0358] Consequently, when the base station configures / instructs the SRI for the UE, it can be recognized that the SRI includes a meaning of a type of classification indication. In addition, the SRI can be defined / configured to be applied when interpreting other fields within the corresponding UL concession based on the indicated classification.
[0359] In other words, the number of SRS antenna ports can be predefined or configured for each SRS resource (for example, by the higher layer signaling, such as RRC), and when the base station transmits the UL concession that includes the SRI for the UE, the number of classifications for uplink data transmission (for example, PUSCH) of the UE can be determined as the number of antenna ports that correspond to the SRS resources indicated by the SRI.
[0360] As another example, it is possible to omit the SRI information indication and automatically indicate which SRS resource index is indicated through a classification indication (field) indicated by the UL concession or similar, and the operation can be defined / configured / indicated so that a pre-encoder applied to the corresponding implicitly indicated resource SRS resource index is applied during U transmission of the UE (however, it is preferable that only one SRS resource associated with a specific classification is limited to one link).
[0361] Alternatively, as a signaling related to more flexible UL programming, the base station can be defined / configured to independently inform the classification indication as well as the SRI for the UE. This is a case where one or more SRS resources (s) can be configured for a specific target classification. The reason why the base station sets up a plurality of SRS resources for a given classification is that the UE applies different vectors / beam formation coefficients in relation to the same classification and tries to transmit i SRS several times. That is, the base station measures the pre-coded SRS with different beam coefficients for the same classification to provide the flexibility to determine and instruct which UL pre-encoder is most advantageous (in terms of performance) even when the corresponding classification is finally selected.
[0362] In addition / alternatively, when the UE applies “specific beamforming vectors / coefficients” to the corresponding pre-coded SRS, the UE can be configured to apply the “beamforming vectors / coefficients” as the vectors / beam formation coefficients that are common across the transmission band as a broadband attribute.
[0363] In addition, an operation can be defined or configured for the UE to transmit a pre-coded SRS by subband to the corresponding SRS resource in the form of applying different / independent beam formation coefficients / vectors at a frequency specific subband unit (or PRB (group)) selectively across the transmission band.
[0364] In addition, that is, the base station can designate whether broadband pre-coding or sub-band pre-coding is applied to the pre-coded SRS for the UE by L1 (by DCI), L2 ( by MAC (CE) and / or L3 control elements (by RRC).
[0365] Even when “specific frequency-selective beam vectors (subband)” are applied when transmitting specific pre-coded SRS, the following operation can be defined or configured for the UE.
[0366] i) The base station informs the UE about corresponding “frequency-selective beam vectors (subband)” (separately or when indicating / triggering the corresponding SRS transmission) so that the UE follows the information .
[0367] ii) The UE can arbitrarily select (eNB transparently, randomly) to transmit pre-coded SRS (frequency selective) for each SRS resource.
[0368] iii) The UE can find (alternatively, find and report) the best "server beam" by measuring Y (for example, Y = 1) of DL specific RS ports (for example, RRM-RS, BRS, BRRS, etc.) transmitted by the base station. In addition, the UE can determine a vector / precoder / coefficient coefficient X by Y selectively in frequency (as a dimension by the X number of antennas / TRX ports of the UE) for each subband when the UE determines its own best “receiving beam Rx” (paired) to apply the vector / pre-encoder / beam-forming coefficient X by Y reversally (for example, obtaining Hermitian) when transmitting the corresponding pre-encoded SRS.
[0369] When such an RRM-RS type (for example, BRS, BRRS, etc.) is used, it is limited to Y = 1, so that the SRS transmission of the UE can be limited to only one pre-coded rating SRS 1.
[0370] In addition, it is possible to explicitly indicate whether to calculate the precoder X by Y for a specific type of RRM-RS signaling (for example, BRS, BRRS, etc.). In addition, the specific RRM-RS (for example, BRS, BRRS, etc.) (ports) can be indicated as a type of near-colocalized signaling (QCL).
[0371] iv) The UE can determine its own best “receiving beam Rx” (paired) when measuring DL Z specific RS ports (for example, CSI-RS) (> = 1) (for CSI measurement) transmitted to from the base station. In that case, the UE can determine a vector / precoder / coefficient coefficient X by Z selectively in frequency (as a dimension by the X number of antennas / TRX ports of the UE) for each subband and apply the vector / precoder / beamform coefficient X by Z reversely (for example, obtaining Hermitian) when transmitting the corresponding precoded SRS. The operation can be defined or configured for the UE.
[0372] In other words, the UE can transmit the SRS using the spatial filtering that is the same as the spatial filtering used to receive a specific DL RS when transmitting the SRS transmission in the specific subband. That is, the UE can implement spatial filtering which is ideal for receiving DL RS for each DL RS, and the base station can indicate that the UE performs the transmission of an SRS resource in the specific subband using the same filtering spatial than the spatial filtering used by the UE to receive a specific DL RS.
[0373] When CSI-RS is used in this way, it can be limited to Z> 1, or can be flexibly defined or configured for the UE as Z> = 1. The reason for not using RRM-RS above (for example, BRS, BRRS) is that it can be limited to only rating 1 because it can be limited to a single port, so it is effective to use CSI-RS to support rating> 1.
[0374] Furthermore, the UE can be explicitly indicated to calculate the precoder X by Z for which specific CSI-RS (port (s)). In addition, the specific CSI-RS (port (s)) can be indicated as a type of QCL signaling. In addition / alternatively, the UE can be defined / configured in which the corresponding CSI-RSs (port (s)) have a QCL connection with which RRM-RS (for example, BRS, BRRS) together or separately.
[0375] - It will be evident that all (or some) of the proposed operations associated with the SRS can be applied to the schemes (for example, a single PMI (TPMI), scheme based on pre-encoder) that does not follow the U1 structure and / or U2. For example, to determine a single specific U UL pre-encoder, operations can be modified / applied as operations, such as providing a specific UL pre-encoder indication for pre-encoded / non-pre-encoded SRS transmissions (by configuration based on SRS resource (s)) or similar.
[0376] - The term "SRS resource" is a name given for the sake of convenience and, thus, the SRS resource can be flagged / indicated to the UE in a way in which a specific index is actually provided per resource unit SRS. Alternatively, the operation of the present invention can be applied by another name / parameter that replaces the concept of the "SRS resource" by connecting some / specific virtualized SRS port (s) grouped by the specific grouping in relation to SRS ports (all) transmitted by the UE . ADDITIONAL PROPOSALS
[0377] In such an operation, the semi-open loop (OL) UL transmission can be configured / indicated for the UE in the form of exclusion of all U2 information for each subband.
[0378] For example, the base station can transmit a UL grant of a type without the U2 information to the UE as described above via specific (separate) signaling (or using one of the U1 indices) and this can operate instructing the UE to carry out the (semi) OL UL transmission.
[0379] When the UE is configured / instructed as described above, the UE can ignore the information even if the U2 information exists in the UL grant.
[0380] Alternatively, when the UE is configured / targeted as discussed above, the payloads in which U2 information may exist can be excluded from the DCI (related to UL). In this case, the UE can be set or configured to perform blind detection (BD) for different payload sizes in a way in which the total payload size of the corresponding DCI is reduced in relation to the case in which the U2 information exists.
[0381] Furthermore, the (semi) OL UL transmission can be instructed in a way of excluding only the pre-encoder information in the direction of a specific (spatial) dimension of U1 and / or U2.
[0382] For example, when the UE determines that the channel change is insignificant in the vertical direction and the channel change is relatively severe in the horizontal direction, the U1 and / or U2 information can be displayed together with UL programming in a way in which horizontal component-specific pre-encoder information is deleted (or ignored or replaced with other information). In that case, the UE can transmit UL the corresponding part by applying an OL scheme, such as a pre-encoder cycle according to a specific predefined / indicated OL pre-encoding scheme. In addition, the UE can perform UL transmission by applying the pre-encoder part as instructed for the specific (spatial) dimension for which U1 and / or U2 information is provided.
[0383] As described above, when specific (spatial) dimension precoder information is deleted and displayed, the payload portion can be deleted. In this case, the UE can be defined or configured to carry out the DB for different payload sizes in a way in which the total payload of the corresponding DCI is reduced compared to the conventional one.
[0384] The mapping of U1 and U2 payload sizes and corresponding information as above can be defined to match the number of corresponding UL specific RS ports (eg SRS) of the corresponding UE, which are transmitted in advance ( linked to the mapping) or configured / instructed for the UE. UL MIMO PROJECT STRUCTURE
[0385] In UL MIMO LTE, the network indicates the pre-encoder for the UE, then the UE transmits the DMRS and the data applying the indicated pre-encoder. In NR UL MIMO, transmission based on the same precoder being applied to both DMRSs and the physical data channel is still desirable in terms of DMRS overhead. The reason is that the transmission rating may be less than the number of TXRUs due to the lack of dispersers in most cases.
[0386] Therefore, it is preferable that transmission based on pre-encoded RS in which the same pre-encoder is applied to both DMRS and the physical data channel becomes a baseline in NR UL MIMO.
[0387] Regarding the transmission technique, it was agreed to support DMRS UL based on the spatial multiplexing ((SU) -MIMO of single user / MU-MIMO). The transmission of UL coordinated multipoint (CoMP) can also be supported. That is, the UL receiving point (s) may be transparent to the EU.
[0388] For UL SU-MIMO, both an open-loop (OL) technique in which no pre-encoder information is signaled by the network to the UE and a semi-open (OL) mesh technique in which a portion of the pre-encoder information - encoder are signaled by the network to the UE can be considered in addition to a conventional closed-loop technique in which the total information (ie PMI and RI) of the pre-encoder is signaled by the network to the UE. MIMO OL and semi-OL can be useful when full or partial DL / UL reciprocity is valid in TDD. UL MU-MIMO can be based on a closed-loop operation, however, it is not limited to that.
[0389] UL MIMO transmission techniques can be classified in relation to the existence and completeness of the pre-encoder information signaled from the network to the UE as follows:
[0390] - Closed loop: total pre-encoder information is signaled to the UE
[0391] - Open loop: No pre-encoder information is signaled to the UE
[0392] - Semi-open mesh: Part of the pre-encoder information is signaled to the UE
[0393] Furthermore, it was agreed to support at least 8 DL DMRS orthogonal ports for both SU-MIMO DL and MU-MIMO DL. Similar to DL, the UL reference can be LTE so that it is proposed to support at least 4 orthogonal DMRS ports for both UL SU-MIMO and UL MU-MIMO as the baseline. From the SU-MIMO perspective, no clear motivation for supporting higher layers than LTE exists in consideration of the possibility of a higher rating in practical environments (ie, limited number of dominant rays in high frequency bands and limited number of TXRUs in the UE). However, when compatibility with future versions is considered, increasing the maximum layers at the beginning can be considered (for example 8 layers for UL SUMIMIMO when taking large types of UEs into account). From the MU-MMO perspective, NR has a clear motivation to obtain higher-order MU-MIMO to achieve the target spectral efficiency. However, it may be desirable to support MU multiplexing layers that exceed a certain number (for example, 4 or 8) when using non-orthogonal DMRS ports (for example, scrambling sequence) in order to manage DMRS overhead within a reasonable range.
[0394] Therefore, it is preferred that at least 4 orthogonal UL DMRS ports are supported for both SU-MIMO and MU-MIMO.
[0395] Regarding the number of code words for spatial multiplexing, supporting up to two code words like LTE may be reasonable considering a trade-off relationship between link adaptation flexibility and control signaling overhead.
[0396] Therefore, it is preferable that for NR UL MIMO, up to two codes are basically supported. SELECTIVE FREQUENCY PRECODING FOR UL MIMO
[0397] There was an agreement that the cyclic prefix (CP) -OFDM without the specified low peak / average power ratio (PAPR) / cubic metric technique (s) is recommended to be supported for uplink NR waveform to at least up to 40 GHz for advanced Mobile Broadband (eMBB) and ultra-reliable low latency (URLLC) communication services.
[0398] Considering a CP-OFDM waveform and a supportable system bandwidth increased in NR, frequency selective pre-coding can be considered as being introduced for UL MIMO. However, the increased control channel overhead due to the indicated subband PMIs can be a critical problem for the application of such frequency selective UL-MIMO pre-coding. Although it may be considered to signal multiple PMIs separately from the UL-related DCI and include a pointer field in the DCI to indicate such signaling, this type of two-step approach may not be desired due to the latency to provide complete information from multiple PMIs in the sense sub-band in a first stage. In other words, a motivation for introducing such a frequency-selective UL pre-encoder is to obtain a quick adaptation to the UL link while also exploring the frequency domain, so that it is desired that the complete set of pre-encoder information be distributed instantly to the UE when the pre-encoder information set is programmed for UL transmission.
[0399] To solve the problem of control channel overload for frequency selective UL-MIMO programming, the application of the double structure of the codebook as in DL similarly to the case of UL (for example, case 4-Tx) needs to be investigated. Considering the CP-OFDM structure agreed for UL, a final UL W precoder per subband can be decomposed into a broadband PMI component W_1 and the corresponding subband PMI component W_2. Therefore, in DCI UL programming, it is sufficient that the W_1 information is included once, and it is necessary that multiple W_2s are included depending on the programmed RB region provided by a resource allocation field in the same DCI. How to set the code book for W_1 and W_2 is for further study, however the baseline should reuse the Rel-12 DL 4-Tx code book. The existing LTE 2-Tx DL code book can be reused as for the case of 2- Tx UL and all PMI per subband needs to be provided in the UL grant schedule. It should also be investigated whether the OFDM-based UL-MIMO precoder (DFT-S-OFDM) broadcast by DFT is supported and, in this case, how to configure the UE using the CP-OFDM-based UL precoder or using the UL pre-encoder based on DFT-S-OFDM as discussed above.
[0400] That is, the UE can be configured with at least one of the codebook 1 based on CP-OFDM (for example, the double codebook structure) and the codebook 2 based on DFS-S- OFDM (eg cubic metric preservation code book, etc.) from the base station. In addition, the UE can be configured with which the codebook-based UL pre-coding is to be performed based on the above codebooks from the base station via L1 (eg, by DCI), L2 (eg , by MAC CE), and L3 (for example, by RRC).
[0401] Particularly, when the CP-OFDM based UL transmission is configured / instructed (and / or switched) with one of the base station code books 1 and the code book 2 and you can apply the configured / instructed code book and conversely, when the DFS-OFDM-based UL transmission is configured / instructed, it may be limited that the UE can continuously apply only code book 2. The reason is that, under the DFS-S-OFDM scheme, the application code book 1 may be inappropriate because the application of code book 1 greatly amplifies PAPR and the like.
[0402] More particularly, as mentioned above, which code book is applied in conjunction with a specific rating value can be set or configured for the UE. For example, in the case of X rating transmission (for example, X = 1), codebook 2 can be set to be applied or it can be configured for the UE in terms of transmission power, such as PAPR problems. Conversely, in the case of classification Y (for example, Y = 2) or more, codebook 1 is configured (for example, in general, UE other than a cell border region) to be applied in order to be defined or configured for the UE to apply the precoder capable of maximizing throughput instead of an aspect of transmission power.
[0403] When such operations are applied, when the classification is indicated through UL concession or similar, the UE can automatically analyze / apply the indicated PMI / precoder while applying the different code book as above together with the indicated classification .
[0404] In the description above, as an example, an operation is described, in which a specific codebook (for example, codebook 1 or codebook 2, ...) is adopted in conjunction with the configuration based on a specific waveform (for example, based on CP-OFDM or DFS-S-OFDM).
[0405] However, the present invention is not limited to this, and such operations can be defined or configured / instructed for the UE so that the UE can initiate UL transmission by applying a specific codebook between the specific candidate codebook 1 (for example, a DFT-based code book), code book 2 (for example, a Grassmannian code book), and code book 3 (for example, an owner code book) under instruction base station regardless of the specific waveform at the time of UL transmission by the UE.
[0406] As a more specific modality, candidate code book 1, which is most suitable when an array / spacing between antennas according to a UE antenna configuration are implemented in a relatively uniform and / or strictly spaced form, can be defined or configured to the UE in a specific DFT-based codebook (for example, a dual codebook structure including an LTE-A codebook) using a DFT array or the like. In addition, candidate codebook 2, which is most suitable when the arrangement / spacing between antennas according to the EU antenna configuration is relatively irregular or widely spaced, can be defined / configured in an optimized codebook form in order to maximally maintain an equal distance from an interceding vector, such as the Grassmannian codebook. In addition, candidate code book 3 can be defined or configured to the UE in the form of a specific hybrid type code book, for example, the proprietary code book as a form made by extracting some code vectors from different books of codes having different attributes and purposes, which include a codebook 1 and a codebook 2 (according to the EU antenna configuration).
[0407] As a result, when the UE accesses a specific base station file in advance, the UE can be set or configured to perform a capacity signaling, through an UE capacity signaling, which code book is at least one among ( os) specific candidate code books that can be applied at the time of UL transmission is implemented or supported. In addition, when the number of codebooks that are implemented / supported is equal to two or more, the UE can notify the base station which codebook of the two codebooks the UE prefers (can provide preference information subdivided so provide weighting). In that case, which codebook is most suitable can be determined based on the implemented antenna configuration characteristic of the corresponding UE and there is an effect that information related to a codebook that shows a more advantageous effect in terms of book performance of implemented / supported codes are provided to the base station.
[0408] In addition, based on the information, the base station allows the UE to configure / indicate the code book to be applied at the time of transmission in UL. In this case, among the codebooks that the UE performs the signaling of the ability to implement / support, a codebook that is not implemented / supported by the corresponding base station may also exist. In this case, the base station can configure the UE to use only the implemented / supported codebook (regardless of the codebook preference information for codebook reported by the UE). Alternatively, even if the base station is also able to configure / instruct a plurality of codebooks to the UE (ie, even if all codebooks are implemented), the base station can configure / assign the specific codebook to the UE. commonly applied to be cell specific or UE group specific considering synthetically considering a codebook support implementation / status and / or codebook preference status of the plurality of UEs accessing the corresponding cell (e.g. for the purpose of facilitating UL MU-MIMO or similar transmission).
[0409] In the method where the base station configures / instructs the corresponding UE to apply the specific code book at the time of transmission in UL, a relatively almost static configuration method by RRC signaling (and / or MAC CE signaling) or similar rules are also applicable. As described above, it is possible to dynamically indicate which specific code book should be applied to the UE by a relatively more dynamic signaling / indication in conjunction with a specific programming grant UL. This dynamic indication can be implicit and / or explicitly indicated (together with the resource field information) through a specific field in the control signal, such as the corresponding concession UL.
[0410] More particularly, as mentioned earlier, which code book should be applied in conjunction with a specific classification can be predefined or configured to the UE. For example, when a broadcast of UL 1 programming schedule rating UL is transmitted, the UE can be continuously defined or configured to the UE to initiate the UL transmission by applying a specific codebook (for example, codes 2) associated with it. In addition, when a transmission of UL schedule X of granting UL classification (for example, X> 1) is transmitted, the UE can be continuously defined or configured to the UE to initiate transmission in UL by applying a code book (for example, codebook 1) associated with it.
[0411] Therefore, if supported, all subband UL-MIMO precoders are preferably instantly provided to the UE within the programming grant UL, in which case, a broadband component can be included only once to reduce overhead of the control channel. Transmission based on SRS pre-coded for UL MIMO
[0412] For UL (LA) link adaptation, LTE can configure the UE to transmit SRS with different multiple sets of SRS-related parameters, where the UE can apply specific pre-coding / selection implemented on SRS ports especially when the number set of SRS ports is less than the total UE broadcast (Tx) antenna ports. Compared to CSI-RS-based operations for the formation of (e) FD-MIMO beams accentuated in Rel-13/14, the pre-coded SRS / beam-formed transmissions to UL LA need to be thoroughly investigated in NR. For convenience of description, there can be three types of UE in terms of the UL LA process as follows:
[0413] 1) EU Type 1 (UL-LA started with pre-coded SRS transmission)
[0414] - The UE can be configured with one or more SRS resources and beam formation indicated by transmission and reception point (TRP) or transparent TRP beam formation is applied to the SRS transmission in each SRS resource.
[0415] - Based on the measurement of pre-coded SRS resources transmitted from UE, the TRP determines the SRS resource indicator (SRI) (in the case of multiple configured SRS resources), MCS and / or a pre-encoder through the SRS ports on the SRI are determined and indicate the SRI, the MCS, and the pre-encoder to the UE when the programming grant UL is delivered to the UE.
[0416] 2) EU Type 2 (UL-LA initiated with the transmission of non-pre-encoded SRSs)
[0417] - The UE can be configured with an SRS resource and the UE transmits non-pre-coded SRS.
[0418] - Based on the measurement of pre-encoded SRS resources transmitted from UE, the TRP determines the MCS and / or the pre-encoder via the SRS port on the SRI are determined and indicate the MCS and the pre-encoder to the UE when the programming grant UL is delivered to the UE.
[0419] In the case of 4-Tx UE and CP-OFDM, the previous double codebook structure is used for the frequency-selective UL-MIMO precoder.
[0420] 3) UE Type 3 (UL-LA initiated with the transmission of non-pre-coded SRS and transmission of pre-coded SRS according to the indication of TRP)
[0421] - Based on the measurement of non-EU pre-coded SRS K1 ports, the TRP determines a thick beam former and indicates it to the UE to be applied in the transmission of the pre-coded SRS K2 (<KI) ports Next. Then, based on the measurement of the pre-encoded SRS ports transmitted from the UE, the TRP determines MCS and / or pre-encoder, and indicates them when the programming grant UL is delivered to the UE.
[0422] Based on the previous classified types that can be reported by the UE, different UL-LA processes can be configured to be specific to the UE, including which types of SRS transmission are performed by the UE. Considering the cases of pre-coded SRS transmission (for example, Type 1 and / or Type 3), multiple SRS resources can be configured to the UE, where the UE transmits SRS ports formed by beams differently in each configured SRS resource. The TRP can indicate this beamform information to the UE, or the UE is allowed to apply the transparent TRP beamformer to the SRS transmission. Then, when the programming grant UL is provided to the UE, the TRP can indicate the SRS resource indicator to which the UE must apply the same beam former used in the SRS transmission corresponding to the indicated SRS resource, for the UL transmission programmed. Furthermore, in the selected SRS resource, the TRP can also indicate digital pre-coding information (for example, UL PMI) through the SRS ports within the indicated SRS resource. It should be noted that the configured number of SRS ports for each SRS resource can be interpreted as a target classification in the transmission in UE UL. Therefore, TRP can configure multiple SRS resources, each corresponding to a different classification to cover classifications 1 to 4 (for example, port v SRS configured for the vth SRS resource (where v = 1, 2, 3, )).
[0423] Consequently, procedures related to the transmission of non-pre-coded and / or pre-coded SRS should be further investigated based on different types of UEs in terms of the UL link adaptation process.
[0424] Figure 13 is a diagram that illustrates a method for transmitting and receiving an uplink, according to an embodiment of the present invention.
[0425] In Figure 13, the operation of the present invention is simply illustrated, and a more detailed description of it can follow the operation mentioned above.
[0426] With reference to Figure 13, the UE receives information about downlink control (DCI) from the base station (S1303).
[0427] The DCI may include an SRS Resource Indication (SRI), a pre-coding indication (for example, U1 and / or U2 or TPMI) and / or a classification indication (for example, TRI).
[0428] For example, the pre-coding indication can be divided into a first pre-coding indication (ie U1) that has a broadband attribute and a second pre-coding indication (U2) indicated for each sub-band. In that case, the second U2 pre-coding indication can be transmitted while it is jointly encoded with uplink resource allocation information programmed for the UE. That is, the second pre-coding indication U2 can be configured / indicated together in connection with an RA UL field.
[0429] The UE transmits an uplink to the base station by applying the pre-coding indicated by the pre-coding indication on an antenna port of an SRS transmitted on an SRS resource selected by the SRI (S1304).
[0430] The number of classifications for uplink transmission can be explicitly indicated by DCI or implicitly determined as the number of SRS antenna ports transmitted on the SRS resource selected by SRI at DCI.
[0431] However, before step S1303, the UE can receive a downlink reference signal (DL RS) (for example, CSI-RS, etc.) from the base station (S1301).
[0432] In addition, the UE can transmit the pre-coded SRS to each of one or more SRS resources configured for the UE to the base station (S1302).
[0433] In this case, the base station can select an SRS resource that has the highest reception quality through SRS measurement for each SRS resource and indicate the UE when deriving the pre-coding indication (for example, U1 and / or U2 or TPMI) in relation to the SRS port (s) on the selected SRS resource.
[0434] Furthermore, a beamforming vector and / or beamforming coefficient applied to the transmission of the pre-coded SRS can be configured by the base station through a control channel signaling or arbitrarily determined by the UE.
[0435] In addition, the beamforming vector and / or beamforming coefficient applied for the pre-coded SRS transmission in the SRS resource can be determined based on a beamforming vector and / or beam formation coefficient. beams used for the reception of the DL RS (for example, CSI-RS etc.).
[0436] More specifically, the UE measures the DL RS transmitted by the base station to find (and also report) a better “server beam”. In addition, the UE can determine the best "receiving beam Rx" paired from it to the best "server beam". In addition, the UE can transmit the pre-coded SRS by applying the corresponding beam-forming vector / coefficient (s), when transmitting the pre-coded / beam-formed SRS, inverting (for example, adopting Hermitian) the best “Rx receiving beam” using a reciprocating DL / UD channel feature (or a beam pair link). That is, the transmission of pre-coded SRS can be performed with the spatial filtering that is the same as the spatial filtering used to receive a specific DL RS (for example, the best “server beam”).
[0437] When the DL-RS is CSI-RS, the CSI-RS feature used to determine that the beamforming vector and / or beamforming coefficient applied for the pre-coded SRS transmission is indicated by the station base.
[0438] In addition, the transmission of pre-coding SRS that the UE performs on the SRS resource can be performed independently for each sub-band.
[0439] For example, for the transmission of SRS pre-coded in the SRS resource, an independent beamforming vector and / or beamforming coefficient can be applied for each subband.
[0440] Furthermore, the beamforming vector and / or beamforming coefficient applied to the pre-coded SRS transmission for each subband in the SRS resource can be determined based on a beamforming vector and / or beamforming coefficient used to receive the DL RS (for example, CSI-RS etc.).
[0441] More specifically, the UE measures the DL RS transmitted by the base station to find (and also report) the best “server beam”. In addition, the UE can determine the best "receiving beam Rx" paired from it to the best "server beam". In addition, the UE can transmit the pre-coded SRS to each sub-band by applying the corresponding beam-forming vector / coefficient (s), when transmitting the pre-coded / beam-formed SRS, inverting (by example, adopting Hermitian) the best “Rx receiving beam” using a reciprocating DL / UD channel feature (or a beam pair link). That is, the transmission of pre-coded SRS can be performed with the spatial filtering that is the same as the spatial filtering used to receive a specific DL RS (for example, the best “server beam”) in a specific subband.
[0442] In this case, when the DL-RS is the CSI-RS, the CSI-RS feature used to determine that the beamforming vector and / or beamforming coefficient applied for the pre-coded SRS transmission is indicated by the base station. GENERAL APPLIANCE TO WHICH THE PRESENT INVENTION CAN BE APPLIED
[0443] Figure 14 is a block diagram of a wireless communication device, according to one embodiment of the present disclosure.
[0444] With reference to Figure 14, the wireless communication system includes a base station (eNB) 1410 and a plurality of user equipment (UEs) 1420 located within the eNB 1410 region.
[0445] eNB 1410 includes a processor 1411, a memory 1412 and a radio frequency (RF) unit 1413. Processor 1411 implements the functions, processes and / or methods proposed in Figures 1 to 19 above. The wireless interface protocol layers can be implemented by the 1411 processor. The 1412 memory is connected to the 1411 processor, and stores various information to drive the 1411 processor. The 1413 transceiver is connected to the 1411 processor, and transmits and / or receives signals radio.
[0446] The UE 1420 includes a processor 1421, a memory 1422 and a radio frequency (RF) unit 1423. The processor 1421 implements the functions, processes and / or methods proposed in Figures 1 to 13 above. The wireless interface protocol layers can be implemented by the 1421 processor. The 1422 memory is connected to the 1421 processor, and stores various information to drive the 1421 processor. The 1423 transceiver is connected to the 1421 processor, and transmits and / or receives signals radio.
[0447] Memories 1412 and 1422 can be located inside or outside processors 1411 and 1421, and can be connected to processors 1411 and 1421 with well-known means. In addition, the eNB 1410 and / or the UE 1420 can have a single antenna or multiple antennas.
[0448] The modalities described so far are those of the elements and technical resources that are coupled in a predetermined form. To the extent that there is no apparent mention, each of the elements and technical resources must be considered selective. Each of the elements and technical characteristics can be incorporated without being coupled with other elements or technical resources. In addition, it is also possible to construct the modalities of the present invention by coupling a part of the elements and / or technical resources. The order of operations described in the modalities of the present invention can be changed. A part of the technical elements or resources in one modality can be included in another modality, or can be replaced by the technical elements and resources that correspond to another modality. It is evident to construct the modality by combining claims that have no explicit reference to the following claims, or to include the claims in a new claim defined by an amendment after application.
[0449] The modalities of the present invention can be obtained by various means, for example, hardware, firmware, software or a combination thereof. In the case of hardware, a modality of the present invention can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) , field programmable port arrays (FPGAs), a processor, a controller, a microcontroller, a microprocessor, and the like.
[0450] In the case of implementation by firmware or software, a modality of the present invention can be implemented in a form such as a module, a procedure, a function, and so on that performs the functions or operations described so far. Software codes can be stored in memory and triggered by the processor. The memory can be located inside or outside the processor, and can exchange data with the processor using several known means.
[0451] It will be understood by those skilled in the art that various modifications and variations can be made without departing from the essential characteristics of the scope of the inventions. Therefore, the detailed description is not limited to the modalities described above, but should be considered as examples. The scope of the present invention must be determined by a reasonable interpretation of the appended claims, and any modification within the scope of equivalence must be included in the scope of the present invention. INDUSTRIAL APPLICABILITY
[0452] The present invention has been described based on an example in which it is applied to LTE 3GPP / LTE-A systems or 5G system, however it can be applied to several wireless communication systems in addition to LTE 3GPP / LTE- systems A or 5G system.

权利要求:
Claims (20)
[0001]
1. Method for carrying out uplink transmission by means of user equipment (UE) in a wireless communication system, the method CHARACTERIZED by the fact that it comprises: performing a plurality of sounding reference signal transmissions signal) (SRS), for a base station, in a plurality of SRS resources configured for the UE; receive, from the base station, a transmission concession for the UE to carry out the uplink transmission, in which the transmission concession includes (i) an SRS resource indication (SRI) indicating an SRS resource among the plurality of resources SRS, in which the plurality of SRS transmissions were performed by the UE, and (ii) a pre-coding indication; determine a pre-coding for the uplink transmission based on (i) the SRS resource indicated by SRI in the transmission concession, and (ii) the pre-coding indication; and carry out the uplink transmission to the base station applying the pre-coding that was determined based on (i) the SRS resource indicated by SRI in the transmission concession, and (ii) the pre-coding indication.
[0002]
2. Method, according to claim 1, CHARACTERIZED by the fact that, for the uplink transmission, at least one of (i) an uplink beam formation vector or (ii) a beam formation coefficient uplink is configured through the control channel signaling by the base station or is determined by the UE.
[0003]
3. Method according to claim 2, CHARACTERIZED by the fact that the at least one of the uplink bundle formation vector or the uplink bundle formation coefficient is determined based on at least one out of one downlink beam formation vector or a downlink beam formation coefficient used to receive a downlink reference signal (DL RS) from the base station.
[0004]
4. Method, according to claim 3, CHARACTERIZED by the fact that the DL RS is a channel state information reference signal (CSI-RS), and in which a CSI-RS resource used to determine the at least an uplink bundle vector or the uplink bundle coefficient is indicated by the base station.
[0005]
5. Method according to claim 1, CHARACTERIZED by the fact that at least one of an uplink beam formation vector or an uplink beam formation coefficient is applied independently for each subband for transmission uplink link.
[0006]
6. Method, according to claim 5, CHARACTERIZED by the fact that at least one of the uplink beam formation vector or the uplink beam formation coefficient applied to the uplink transmission for each sub- bandwidth is determined based on at least one of a downlink beam forming vector or a downlink beam forming coefficient used to receive a downlink reference signal (DL RS) from the base station .
[0007]
7. Method, according to claim 6, CHARACTERIZED by the fact that the DL RS is a channel state information reference signal (CSI-RS), and in which a CSI-RS resource used to determine the at least an uplink beam formation vector or the downlink beam formation coefficient is indicated by the base station.
[0008]
8. Method, according to claim 1, CHARACTERIZED by the fact that the transmission concession additionally comprises a classification indication for the uplink transmission.
[0009]
9. Method, according to claim 1, CHARACTERIZED by the fact that a number of classifications for uplink transmission is determined as a number of SRS antenna ports transmitted on the SRS resource indicated by SRI.
[0010]
10. Method, according to claim 1, CHARACTERIZED by the fact that the pre-coding indication comprises a first pre-coding indication and a second pre-coding indication, and in which the second pre-coding indication is encoded with uplink resource allocation information programmed for the UE.
[0011]
11. Method, according to claim 1, CHARACTERIZED by the fact that the pre-coding indication is configured to indicate the pre-coding that corresponds to an antenna port of the SRS resource that is indicated by SRI.
[0012]
12. Method, according to claim 1, CHARACTERIZED by the fact that applying the pre-coding which is indicated by the pre-coding indication and which corresponds to the SRS resource indicated by SRI comprises: coding, with the use of pre-coding , information that must be communicated to the base station.
[0013]
13. Method, according to claim 1, CHARACTERIZED by the fact that receiving the pre-coding indication that indicates the pre-coding that corresponds to the SRS resource indicated by SRI comprises: receiving, from the base station, an indicator of transmitted pre-coding matrix (TPMI).
[0014]
14. Method, according to claim 1, CHARACTERIZED by the fact that determining the pre-coding for the uplink transmission based on (i) the SRS resource indicated by SRI and (ii) the pre-coding indication comprises : based on the pre-coding indication indicating a first pre-coding indication and based on the SRI indicating a first SRS resource: determining the pre-coding as a first pre-coding that corresponds to the first SRS resource; and based on the precoding indication indicating the first precoding indication and based on the SRI indicating a second SRS resource: determining the precoding as a second precoding that corresponds to the second SRS resource.
[0015]
15. Method, according to claim 1, CHARACTERIZED by the fact that determining the pre-coding for the uplink transmission comprises: determining a plurality of pre-coding coefficients for the uplink transmission, and in which to perform the uplink transmission to the base station applying pre-coding comprises: performing uplink transmission to the base station by applying the plurality of pre-coding coefficients to antenna ports that are identical to the antenna ports of an SRS transmission that was performed on the SRS resource indicated by SRI.
[0016]
16. Method, according to claim 1, CHARACTERIZED by the fact that the transmission concession is received from the base station through Downlink Control Information (DCI).
[0017]
17. Method, according to claim 1, CHARACTERIZED by the fact that the transmission concession is received from the base station by means of Radio Resource Control (RRC) signaling.
[0018]
18. User equipment (UE) configured to carry out uplink transmission in a wireless communication system, the UE CHARACTERIZED by the fact that it comprises: a radio frequency (RF) unit; at least one processor; and at least one computer memory connectable operably to at least one processor and storing computer instructions that, when executed, cause at least one processor to perform the operations comprising: performing a plurality of polling reference signal (SRS) transmissions ), for a base station, in a plurality of SRS resources configured for the UE; receive, from the base station, through the RF unit, a transmission concession for the UE to carry out the uplink transmission, in which the transmission concession includes (i) an SRS resource indication (SRI) indicating an SRS resource among the plurality of SRS resources, in which the plurality of SRS transmissions was performed by the UE, and (ii) a pre-coding indication; determine a pre-coding for the uplink transmission based on (i) the SRS resource indicated by SRI in the transmission concession, and (ii) the pre-coding indication; and carry out the uplink transmission through the RF unit to the base station applying the pre-coding that was determined based on (i) the SRS resource indicated by SRI in the transmission concession, and (ii) the indication of pre -codification.
[0019]
19. Method for receiving, by a base station, an uplink transmission from a user equipment (UE) in a wireless communication system, the method CHARACTERIZED by the fact that it comprises: receiving, from the UE, a plurality of polling reference signal (SRS) transmissions on a plurality of SRS resources configured for the UE; transmit to the UE a transmission concession for the UE to carry out the uplink transmission, where the transmission concession includes (i) an SRS resource indication (SRI) which indicates an SRS resource among the plurality of SRS resources, in which the plurality of SRS transmissions was received from the UE and (ii) a pre-coding indication; and receive, from the UE, the uplink transmission that was pre-coded by the UE with a pre-coding that is determined based on (i) the pre-coding indication and (ii) the SRS resource indicated by SRI transmission concession.
[0020]
20. Base station configured to receive an uplink transmission from user equipment (UE) in a wireless communication system, the base station CHARACTERIZED by the fact that it comprises: a radio frequency (RF) unit; at least one processor; and at least one computer memory connectable operatively to at least one processor and storing computer instructions that, when executed, cause at least one processor to perform the operations that comprise: receiving, from the UE through the RF unit, a plurality polling reference signal (SRS) transmissions on a plurality of SRS resources configured for the UE; transmit, to the UE through the RF unit, a transmission concession for the UE to carry out the uplink transmission, in which the transmission concession includes (i) an SRS resource indication (SRI) indicating an SRS resource among the plurality SRS resources, in which the plurality of SRS transmissions were received from the UE and (ii) a pre-coding indication; and receiving, from the UE through the RF unit, the uplink transmission that was pre-coded by the UE with a pre-coding which is determined based on (i) the pre-coding indication and (ii) the resource SRS indicated by SRI in the transmission concession.

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EP3480968A1|2019-05-08|

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法律状态:
2020-11-17| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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