KR20190051730A - METHOD, APPARATUS, AND SYSTEM FOR TRANSMITTING DATA BETWEEEN ENB (or GNB) AND UE, AND TRANSMITTING/RECEIVING CONTROL CHANNEL - Google Patents

Abstract

Disclosed are a method for transmitting and receiving data between a terminal and a base station, and an apparatus and a system thereof. Provided in an embodiment of the present invention are a multiplexing method for transmitting data between a terminal and a base station, a method for transmitting and receiving a correspondent control signal, and an apparatus and a system thereof, which allow a part of resource elements (RE) or all REs to be used. To this end, a mini-slot is not arranged at an orthogonal frequency division multiplexing (OFDM) symbol including a demodulation reference signal (DM-RS) of a slot.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplexing method for data transmission between a terminal and a base station, and a method, apparatus, and system for transmitting and receiving control signals,

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting / receiving data between a terminal and a base station, and more particularly, to a method and apparatus for estimating data transmission by sharing control information between the terminal and a base station The present invention also relates to a method for transmitting and receiving resource allocation information used for a DM-RS of a slot user when a slot user and a mini-slot user are multiplexed in a wireless communication system.

3GPP LTE (-A) defines uplink / downlink physical channels for physical layer signal transmission. For example, a physical uplink shared channel (PUSCH) which is a physical channel for transmitting data in the uplink, a physical uplink control channel (PUCCH) for transmitting a control signal, and a physical random access channel (PRACH) A physical downlink shared channel (PDSCH) for transmitting data in downlink, a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH) ).

A downlink control channel (PDCCH / EPDCCH) of the channels is a channel for transmitting uplink / downlink scheduling assignment control information, uplink transmission power control information, and other control information to one or a plurality of terminals. Since there is a limitation on the resources available for the PDCCH that can be transmitted at one time, it is not possible to allocate different resources to each terminal, and the control information should be transmitted to any terminal by sharing resources. For example, in 3GPP LTE (-A), four Resource Elements (REs) are grouped together to form REGs (Resource Element Groups), nine CCEs (Control Channel Elements), and one or a plurality of CCEs And informs the UE of a resource, and a plurality of UEs can share the CCE. Here, the number of CCEs to be combined is called CCE coupling level, and the resource to which CCE is allocated according to the possible CCE coupling level is called a search space. The search space may include a common search space defined for each base station and a terminal-specific or UE-specific search space defined for each terminal. The UE performs decoding on the number of possible CCE combining cases in the search space and can determine whether it corresponds to its own PDCCH through a user equipment (UE) identifier included in the PDCCH. Therefore, it takes a long time to decode the PDCCH and energy consumption is inevitable.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE). To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed. In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed. In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered connection network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, a machine to machine (M2M), and a machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas It is. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

Generally, a mobile communication system has been developed to provide voice service while ensuring the user's activity. However, the mobile communication system is gradually expanding not only to voice but also to data service, and now it has developed to the extent of providing high-speed data service. However, in a mobile communication system in which a service is currently provided, a lack of resources and users demand higher speed services, and therefore, a more advanced mobile communication system is required.

As mentioned earlier, future 5G technologies require lower latency data transmission due to the emergence of new applications such as real-time control and tactile internet, The delay is expected to be reduced to 1ms. 5G aims to provide a data delay that is about 10 times lower than the conventional one. To solve this problem, 5G is expected to propose a communication system using a mini-slot having a shorter TTI period (e.g., 0.2ms) in addition to the existing slot (or subframe).

In mobile communication, a base station simultaneously uses a slot and a mini-slot to simultaneously support users having various requirements. In particular, it is expected to use slot / mini-slot multiplexing method to puncture a resource to be used as a slot to provide a low-delay service and to transmit a mini-slot. However, slot users are punctured partially, which causes serious performance degradation, energy consumption, and additional latency issues for slot users. To overcome this, it is possible to puncture important information (eg DM-RS, demodulation reference signal) of the slot. However, since the mini-slot user does not have information on the slot user, it appropriately transmits the DM-RS resource allocation information of the slot user to the slot user and the mini-slot user when the slot / mini-slot is multiplexed. need.

Specifically, when puncturing a part of resources allocated to a slot and allocating it to a mini-slot, the DM-RS of the slot is allocated to the mini-slot user. To the location of the REs (resource elements) used in the network. Since a mini-slot user can not know the DM-RS pattern used by the slot user, the DM-RS can not use the RE that can be located. However, the present invention can be applied to a method I suggest.

In this task, the above-described problem can be solved by using the following method.

- Do not place mini-slots in OFDM symbols with DM-RS in slot

- Transferring DM-RS of punctured slot due to mini-slot to next mini-slot OFDM symbol

- When the Mini-slot does not puncture the DM-RS of the slot, it informs the resources used in the DM-RS of the slot through the mini-slot control information

- When the mini-slot does not puncture the DM-RS of the slot, it tells the resources used in the DM-RS of the slot to constellation phase rotation of the mini-slot signal

- When the Mini-slot does not puncture the DM-RS of the slot, it uses the CRC of the mini-slot data information to inform the resources used in the DM-RS of the slot

- When the user does not inform the mini-slot user of the resources used in the DM-RS of the slot when the Mini-slot is not puncturing the DM-RS of the slot,

According to the embodiment of the present invention, performance deterioration of a user using a slot can be reduced. Therefore, it is possible to improve the transmission speed of a user using a slot, reduce energy consumption and delay time due to frequent retransmissions. Users who use mini-slots can use DM-RS resource information used by slot users to use additional resources for data transmission, thus achieving high transmission rate or high reliability.

1 shows an example of a radio frame structure used in a wireless communication system.
2 shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system.
3 is a view for explaining a physical channel used in a 3GPP system and a general signal transmission method using the same.
FIG. 4 illustrates a radio frame structure for transmission of a synchronization signal (SS).
5 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.
6 illustrates a configuration of a cell specific common reference signal.
FIG. 7 shows an example of a UL subframe structure used in a wireless communication system.
8 is a conceptual diagram illustrating a carrier aggregation (CA) technique.
FIG. 9 is a diagram for explaining Single Carrier Communication and Multiple Carrier Communication. FIG.
10 is a diagram showing an example in which a cross carrier scheduling technique is applied.
11 is a diagram illustrating a deployment scenario of a UE and a BS in an LTE and LAA service environment.
12 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention.
13 is a diagram illustrating a DM-RS pattern of a slot-UE for explaining the present invention.
FIG. 14 is a diagram showing a slot and a Mini-slot multiplexed. FIG.
FIG. 15 is a diagram illustrating a mini-slot located at an OFDM symbol position without a DM-RS.
FIG. 16 is a diagram illustrating a location of a minislot at an OFDM symbol location with a DM-RS according to an embodiment of the present invention.
FIG. 17 is a diagram illustrating a change in DM-RS position of a slot according to a position of a minislot according to an embodiment of the present invention.
FIG. 18 is a diagram illustrating another CRC used for notifying a DM-RS position change of a slot according to an embodiment of the present invention.
FIG. 19 is a diagram illustrating resource elements that a minislot user may use in an mPDCCH according to an embodiment of the present invention.
FIG. 20 is a diagram illustrating an available RE in an mPDCCH of a minislot user according to an embodiment of the present invention. Referring to FIG.
Figure 21 is a block diagram of a minislot user according to an embodiment of the present invention.
FIG. 22 is a diagram illustrating phase rotation of a URLLC PDSCH according to DM-RS density of a slot according to an embodiment of the present invention.
23 is a diagram illustrating CRC of a code block according to DM-RS density of a slot according to an exemplary embodiment of the present invention.
24 illustrates allocating an additional fewer parity bits according to an embodiment of the present invention.
FIG. 25 is a block diagram of receiving a PDSCH using resources available to a minislot user according to an embodiment of the present invention. Referring to FIG.
26 is a diagram illustrating resource elements that a slot user can additionally use according to an embodiment of the present invention.
27 is a diagram illustrating a synchronization signal block (SSB) in a band transmitted by a base station.
FIG. 28 is a diagram illustrating a COREST and a front-loaded DMRS of a slot that can be received by a UE configured by slot-based communication.
FIG. 29 is a diagram illustrating a COREST, a front-loaded DMRS, and an additional DMRS of a slot that can be received by a UE configured by slot-based communication.
FIG. 30 is a diagram illustrating a case where a resource mapped with an SS / PBCH block or a reserved resource and a front-loaded DMRS collide with each other.
31 is a diagram for allocating a DMRS of a colliding resource to another OFDM symbol in a case where a resource mapped with an SS / PBCH block or a reserved resource and a front-loaded DMRS collide.
FIG. 32 is a diagram for allocating all front-loaded DMRSs to different OFDM symbols in a case where a resource mapped to an SS / PBCH block or a reserved resource and a front-loaded DMRS collide.
FIG. 33 is a diagram for allocating an additional DMRS to another OFDM symbol in a case where a resource mapped with an SS / PBCH block or a reserved resource and a front-loaded DMRS collide with each other.
FIG. 34 shows an example of a case where a resource mapped to an SS / PBCH block or a reserved resource and a front-loaded DMRS collide. In an embodiment, a front-loaded DMRS of a colliding resource is allocated from another OFDM symbol, and an additional DMRS is allocated to another OFDM symbol Fig.
FIG. 35 illustrates a case where a front-loaded DMRS mapping resource conflicts with a resource to which an additional DMRS is mapped and an SS / PBCH block or a reserved resource collides with a resource mapped to another DMRS. DMRS collision is a drawing that does not allocate additional DMRS of resources.
FIG. 36 shows an example of a case where a SS-PBCH block or a reserved resource collides with a resource to which a front-loaded DMRS-mapped resource and an additional DMRS-mapped resource are allocated, and a front-loaded DMRS of a colliding resource is allocated to another OFDM symbol, The additional DMRS of the resource is allocated to another OFDM symbol.
FIG. 37 shows an example of resource allocation according to an embodiment of the present invention.
FIG. 38 shows an example of resource allocation according to an embodiment of the present invention.
FIG. 39 shows an example of resource allocation according to an embodiment of the present invention.
40 is a diagram of a resource allocation procedure according to an embodiment of the present invention.
41 is a diagram illustrating a resource allocation procedure according to an embodiment of the present invention.

As used herein, terms used in the present invention are selected from general terms that are widely used in the present invention while taking into account the functions of the present invention. However, these terms may vary depending on the intention of a person skilled in the art, custom or the emergence of new technology. Also, in certain cases, there may be a term arbitrarily selected by the applicant, and in this case, the meaning thereof will be described in the description of the corresponding invention. Therefore, it is intended that the terminology used herein should be interpreted relative to the actual meaning of the term, rather than the nomenclature, and its content throughout the specification.

Throughout the specification, when a configuration is referred to as being "connected" to another configuration, it is not limited to the case where it is "directly connected," but also includes "electrically connected" do. Also, when an element is referred to as " including " a specific element, it is meant to include other elements, rather than excluding other elements, unless the context clearly dictates otherwise. In addition, the limitations of " above " or " below ", respectively, based on a specific threshold value may be appropriately replaced with "

FIG. 1 shows an example of a radio frame structure used in a wireless communication system.

Particularly, FIG. 1 (a) shows a frame structure for a frequency division duplex (FDD) used in a 3GPP LTE / LTE-A system and FIG. 1 Time division duplex (TDD) frame structure.

Referring to FIG. 1, a radio frame used in the 3GPP LTE / LTE-A system has a length of 10 ms (307200 Ts) and is composed of 10 equal sized subframes (SF). 10 subframes within one radio frame may be assigned respective numbers. Here, Ts represents the sampling time, and is represented by Ts = 1 / (2048 * 15 kHz). Each subframe is 1 ms long and consists of two slots. 20 slots in one radio frame can be sequentially numbered from 0 to 19. [ Each slot has a length of 0.5 ms. The time for transmitting one subframe is defined as a Transmission Time Interval (TTI). The time resource may be classified by a radio frame number (or a radio frame index), a subframe number (also referred to as a subframe number), a slot number (or a slot index), and the like.

The wireless frame may be configured differently according to the duplex mode. For example, in the FDD mode, since the downlink transmission and the uplink transmission are divided by frequency, the radio frame includes only one of the downlink subframe and the uplink subframe for a specific frequency band. In the TDD mode, since the downlink transmission and the uplink transmission are divided by time, the radio frame includes both the downlink subframe and the uplink subframe for a specific frequency band.

Table 1 illustrates the DL-UL configuration of subframes in a radio frame in TDD mode.

[Table 1]

In Table 1, D denotes a downlink subframe, U denotes an uplink subframe, and S denotes a special subframe. The specific subframe includes three fields of Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and UpPTS (Uplink Pilot Time Slot). DwPTS is a time interval reserved for downlink transmission, and UpPTS is a time interval reserved for uplink transmission. Table 2 illustrates the configuration of the singular frames.

[Table 2]

2 illustrates an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, Figure 2 shows the structure of the resource grid of the 3GPP LTE / LTE-A system. There is one resource grid per antenna port. Referring to FIG. 2, a slot includes a plurality of OFDM symbols in a time domain and a plurality of resource blocks (RB) in a frequency domain. The OFDM symbol also means one symbol period. Referring to FIG. 2, a signal transmitted in each slot may be expressed as a resource grid consisting of N ^{DL / UL} _RB * N ^RB _sc subcarriers and N ^{DL / UL} _symb OFDM symbols. have. Here, N ^DL _RB represents the number of resource blocks (RBs) in the downlink slot, and N ^UL _RB represents the number of _RBs in the UL slot. N ^DL _RB and N ^UL _RB depend on the DL transmission bandwidth and the UL transmission bandwidth, respectively. N ^DL _symb denotes the number of OFDM symbols in the downlink slot, and N ^UL _symb denotes the number of OFDM symbols in the UL slot. N ^RB _sc represents the number of subcarriers constituting one RB. The OFDM symbol may be referred to as an OFDM symbol, an SC-FDM (Single Carrier Frequency Division Multiplexing) symbol, or the like according to a multiple access scheme. The number of OFDM symbols included in one slot can be variously changed according to the channel bandwidth and the length of the cyclic prefix (CP). For example, in the case of a normal CP, one slot includes 7 OFDM symbols

In the case of an extended CP, one slot includes six OFDM symbols. Although FIG. 2 illustrates a subframe in which one slot is composed of seven OFDM symbols for convenience of description, embodiments of the present invention may be applied to subframes having a different number of OFDM symbols in a similar manner. Referring to FIG. 2, each OFDM symbol includes N ^{DL / UL} _RB * N ^RB _sc subcarriers in the frequency domain. The type of subcarrier may be a data subcarrier for data transmission, a reference signal subcarrier for transmission of a reference signal, a null subcarrier for a guard band or a direct current (DC) ≪ / RTI > The DC component is mapped to a carrier frequency (f ₀ ) in an OFDM signal generation process or a frequency up-conversion process. The carrier frequency is also referred to as the center frequency (f _c ).

One RB is defined as N ^{DL / UL} _symb consecutive OFDM symbols in the time domain (for example, seven), and N ^RB _scrambled (e.g., twelve) consecutive subcarriers in the frequency domain . For reference, a resource composed of one OFDM symbol and one subcarrier is referred to as a resource element (RE) or tone. Therefore, one RB consists of N ^{DL / UL} _symb * N ^RB _sc resource elements. Each resource element in the resource grid can be uniquely defined by an index pair (k, 1) in one slot. k is an index assigned from 0 to N ^{DL / UL} _RB * N ^RBsc -1 in the frequency domain, and 1 is an index assigned from 0 to N ^{DL / UL} _symb -1 in the time domain.

One RB is mapped to one physical resource block (PRB) and one virtual resource block (VRB). The PRB is defined as N ^{DL / UL} _symb (e.g., 7) consecutive OFDM symbols or SC-FDM symbols in the time domain, and N ^RB _scrambled (e.g., twelve) Is defined by the subcarrier. Therefore, one PRB consists of N ^{DL / UL} _symb * N ^RB _sc resource elements. Two RBs, one in each of two slots of the subframe occupying N ^RB _sc consecutive identical subcarriers in one subframe, are called a PRB pair. The two RBs constituting the PRB pair have the same PRB number (or PRB index).

In order for the UE to receive a signal from the eNB or to transmit a signal to the eNB, the time / frequency synchronization of the UE should be synchronized with the time / frequency synchronization of the eNB. since it can determine the time and frequency parameters necessary for the UE to perform the demodulation of the DL signal and the transmission of the UL signal at the correct time, as long as it is synchronized with the eNB.

3 is a view for explaining a physical channel used in a 3GPP system and a general signal transmission method using the same.

The terminal performs an initial cell search operation such as synchronizing with a base station when power is increased or newly enters a cell (S301). To this end, the terminal receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from a base station and synchronizes with the base station and acquires information such as a cell ID have. Then, the terminal can receive the physical broadcast channel from the base station and acquire the in-cell broadcast information. Meanwhile, the UE can receive the downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.

Upon completion of the initial cell search, the UE receives more detailed system information by receiving a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH) according to the information on the PDCCH (S302).

On the other hand, if the base station is initially connected or there is no radio resource for signal transmission, the terminal can perform a random access procedure (RACH) on the base station (steps S303 to S306). To this end, the UE transmits a specific sequence through a Physical Random Access Channel (PRACH) (S303 and S305), and receives a response message for the preamble on the PDCCH and the corresponding PDSCH S304 and S306). In case of the contention-based RACH, a contention resolution procedure can be additionally performed.

The UE having performed the procedure described above transmits PDCCH / PDSCH reception (S307) and physical uplink shared channel (PUSCH) / physical uplink control channel Control Channel, PUCCH) (S308). In particular, the UE receives downlink control information (DCI) through the PDCCH. Here, the DCI includes control information such as resource allocation information for the UE, and formats are different according to the purpose of use.

Meanwhile, the control information that the UE transmits to the base station through the uplink or receives from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI) ) And the like. In the case of the 3GPP LTE system, the UE can transmit control information such as CQI / PMI / RI as described above through PUSCH and / or PUCCH.

FIG. 4 illustrates a radio frame structure for transmission of a synchronization signal (SS). In particular, FIG. 4 illustrates a radio frame structure for transmission of a synchronous signal and a PBCH in a frequency division duplex (FDD). FIG. 4A illustrates a radio frame in a normal CP (normal cyclic prefix) SS and PBCH. FIG. 4 (b) shows transmission positions of SS and PBCH in a radio frame configured with an extended CP.

The UE obtains time and frequency synchronization with the cell when it is powered on or newly connected to the cell, and performs cell search such as detecting the physical cell identity N ^cell _ID of the cell cell search procedure. To this end, the UE receives a synchronization signal, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the eNB, synchronizes with the eNB, , ID) can be obtained.

Referring to FIG. 4, the SS will be described in more detail as follows. SS is divided into PSS and SSS. PSS is used to obtain time domain synchronization and / or frequency domain synchronization such as OFDM symbol synchronization, slot synchronization, and the like. SSS is used for frame synchronization, cell group ID, and / or cell CP configuration Information). Referring to FIG. 4, the PSS and the SSS are transmitted in two OFDM symbols of each radio frame, respectively. In order to facilitate inter Radio Access Technology ("RAT") measurement, the SS considers 4.6 ms, which is the Global System for Mobile communication (GSM) frame length, in the first slot of subframe 0 and the first slot of subframe 5 Respectively. Specifically, the PSS is transmitted in the last OFDM symbol of the first slot of the subframe 0 and the last OFDM symbol of the first slot of the subframe 5, respectively, and the SSS is transmitted from the second OFDM symbol at the end of the first slot of the subframe 0, Lt; RTI ID = 0.0 > OFDM < / RTI > The boundary of the corresponding radio frame can be detected through the SSS. The PSS is transmitted in the last OFDM symbol of the slot and the SSS is transmitted in the OFDM symbol immediately before the PSS. SS's transmit diversity scheme uses only a single antenna port and is not defined in the standard. That is, a single antenna port transmission or a UE transparent transmission scheme (e.g., Precoding Vector Switching (PVS), Time Switched Diversity (TSTD), Cyclic Delay Diversity (CDD)) can be used for SS transmission diversity .

The SS can represent a total of 504 unique physical layer cell IDs through a combination of three PSSs and 168 SSs. In other words, the physical layer cell IDs are allocated to 168 physical-layer cell-identifier groups, each group including three unique identifiers, such that each physical-layer cell ID is part of only one physical-layer cell- . Thus, the physical layer cell ID _{^{N cell ID = 3N (1)}} ID + N (2) ID is a physical-layer cell - the range of 0 [identifier group to the 167 number N ⁽¹⁾ _ID and the physical-layer cell - a unique number N ⁽²⁾ _ID of 0 to 2 indicating the physical-layer identifier in the identifier group. The UE may detect the PSS to know one of the three unique physical-layer identifiers and may detect the SSS to identify one of the 168 physical layer cell IDs associated with the physical-layer identifier. A ZC (Zadoff-Chu) sequence of length 63 is defined in the frequency domain and used as the PSS.

Referring to FIG. 4, since the PSS is transmitted every 5 ms, the UE can detect that the corresponding subframe is one of the subframe 0 and the subframe 5 by detecting the PSS. However, I do not know what it is. Therefore, the UE can not recognize the boundary of the radio frame only by the PSS. That is, frame synchronization can not be obtained with only PSS. The UE detects an SSS transmitted twice in one radio frame but transmitted as a different sequence and detects the boundary of the radio frame.

5 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.

Referring to FIG. 5, a subframe is composed of 14 OFDM symbols. According to the subframe setting, the first to third OFDM symbols are used as a control region and the remaining 13 to 11 OFDM symbols are used as a data region. In the figure, R1 to R4 represent a reference signal (RS) or pilot signal for antennas 0 to 3. The RS is fixed in a constant pattern in the subframe regardless of the control region and the data region. The control channel is allocated to a resource to which the RS is not allocated in the control region, and the traffic channel is also allocated to the resource to which the RS is not allocated in the data region. Control channels allocated to the control region include a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid-ARQ Indicator CHannel (PHICH), and a Physical Downlink Control Channel (PDCCH).

The PCFICH informs the UE of the number of OFDM symbols used in the PDCCH for each subframe as a physical control format indicator channel. The PCFICH is located in the first OFDM symbol and is set prior to the PHICH and PDCCH. The PCFICH is composed of four REGs (Resource Element Groups), and each REG is distributed in the control area based on the cell ID (Cell IDentity). One REG is composed of four REs (Resource Elements). RE denotes a minimum physical resource defined by one subcarrier x one OFDM symbol. The PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by Quadrature Phase Shift Keying (QPSK).

The PHICH is used as a physical HARQ (Hybrid Automatic Repeat and Request) indicator channel to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL ACK / NACK information for UL HARQ is transmitted. The PHICH consists of one REG and is cell-specific scrambled. The ACK / NACK is indicated by 1 bit and is modulated by BPSK (Binary Phase Shift Keying). The modulated ACK / NACK is spread with a spreading factor (SF) = 2 or 4. A plurality of PHICHs mapped to the same resource constitute a PHICH group. The number of PHICHs multiplexed into the PHICH group is determined by the number of spreading codes. The PHICH (group) is repetitized three times to obtain the diversity gain in the frequency domain and / or the time domain.

The PDCCH is allocated to the first n OFDM symbols of the subframe as the physical downlink control channel. Here, n is an integer of 1 or more and is indicated by the PCFICH. The PDCCH consists of one or more CCEs. The PDCCH notifies each terminal or group of terminals of information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH), an uplink scheduling grant, and HARQ information. A paging channel (PCH) and a downlink-shared channel (DLSCH) are transmitted on the PDSCH. Therefore, the BS and the MS generally transmit and receive data via the PDSCH, except for specific control information or specific service data.

PDSCH data is transmitted to a terminal (one or a plurality of terminals), and information on how the terminals receive and decode PDSCH data is included in the PDCCH and transmitted. For example, if a particular PDCCH is CRC masked with an RNTI (Radio Network Temporary Identity) of " A ", and a DCI format called " C " Assume that information on data to be transmitted using information (e.g., transport block size, modulation scheme, coding information, etc.) is transmitted through a specific subframe. In this case, the UE in the cell monitors the PDCCH using its RNTI information, and if there is more than one UE having the " A " RNTI, the UEs receive the PDCCH, B " and " C ".

FIG. 6 illustrates the configuration of a cell specific common reference signal. In particular, Figure 6 illustrates a CRS structure for a 3GPP LTE system supporting up to four antennas.

[Equation 1]

Where k is a subcarrier index, 1 is an OFDM symbol index, p is an antenna port number, and ^{Nmax and DL} _RB represent the largest downlink bandwidth configuration, expressed as an integer multiple of N ^RB _sc .

The variables v and v _shift define positions in the frequency domain for different RSs, and v is given by

&Quot; (2) "

Where n _s is the slot number in the radio frame and the cell specific frequency transition is given by:

&Quot; (3) "

Referring to FIG. 6 and Equations 1 and 2, the current 3GPP LTE / LTE-A standard defines a cell-specific CRS used for demodulation and channel measurement among the various RSs defined in the corresponding system, To be transmitted over the entire downlink band. Also, in the 3GPP LTE / LTE-A system, the cell-specific CRS is used for demodulation of the downlink data signal, and thus is transmitted every antenna port for downlink transmission.

Meanwhile, the cell-specific CRS can be used not only for channel state measurement and data demodulation, but also for tracking after the UE acquires time synchronization and frequency synchronization of a carrier used for communication with the UE, It is also used for tracking.

FIG. 7 shows an example of a UL subframe structure used in a wireless communication system.

Referring to FIG. 7, the UL subframe may be divided into a control domain and a data domain in the frequency domain. One or several physical uplink control channels (PUCCHs) may be assigned to the control region to carry uplink control information (UCI). One or several physical uplink shared channels (PUSCHs) may be allocated to the data area of the UL subframe to carry user data.

In the UL subframe, subcarriers far away from each other based on a DC (Direct Current) subcarrier are used as a control region. In other words, the subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of the UL control information. The DC subcarrier is a component that is left unused for signal transmission and is mapped to the carrier frequency f ₀ in the frequency up conversion process. In one subframe, the PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency, and RBs belonging to the RB pair occupy different subcarriers in two slots. The PUCCH allocated as described above is expressed as the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, when frequency hopping is not applied, the RB pairs occupy the same subcarrier.

The PUCCH may be used to transmit the following control information.

- SR (Scheduling Request): Information used for requesting uplink UL-SCH resources. OOK (On-Off Keying) method.

- HARQ-ACK: A response to the PDCCH and / or a response to a downlink data packet (eg, codeword) on the PDSCH.

Indicates whether PDCCH or PDSCH has been successfully received. In response to a single downlink codeword, one bit of HARQACK is transmitted and two bits of HARQ-ACK are transmitted in response to two downlink codewords. The HARQ-ACK response includes positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission) or NACK / DTX. Here, the term HARQ-ACK is mixed with HARQ ACK / NACK and ACK / NACK.

- CSI (Channel State Information): Feedback information for the downlink channel. Multiple Input Multiple Output (MIMO) -related feedback information includes RI (Rank Indicator) and PMI (Precoding Matrix Indicator).

Hereinafter, a carrier aggregation technique will be described. 8 is a conceptual diagram illustrating carrier aggregation.

Carrier aggregation is a technique in which a radio communication system uses a frequency block or a (logical sense) cell composed of uplink resources (or component carriers) and / or downlink resources (or component carriers) Which is used as a single large logical frequency band. Hereinafter, the term "component carrier" is used for the convenience of description.

Referring to FIG. 8, the total system bandwidth (System BW) has a bandwidth of 100 MHz as a logical bandwidth. The total system bandwidth includes five component carriers, each of which has a bandwidth of up to 20 MHz. A component carrier comprises one or more contiguous subcarriers physically contiguous. In FIG. 8, each of the component carriers is shown to have the same bandwidth, but this is merely an example, and each component carrier may have a different bandwidth. In addition, although each component carrier is shown as being adjacent to each other in the frequency domain, this figure is shown in a logical concept, wherein each component carrier may physically be adjacent to or spaced from one another.

The center frequency may use different common carriers for each component carrier or common for physically contiguous component carriers. For example, assuming that all of the component carriers are physically adjacent in FIG. 8, the center carrier A can be used. Further, assuming that the respective component carriers are not physically adjacent to each other, the center carrier A, the center carrier B, and the like can be used separately for each component carrier.

In this specification, the component carrier may correspond to the system band of the legacy system. By defining a component carrier based on a legacy system, it is possible to provide backward compatibility and system design in a wireless communication environment in which an evolved terminal and a legacy terminal coexist. In one example, if the LTE-A system supports carrier aggregation, each component carrier may correspond to the system band of the LTE system. In this case, the component carrier may have any of the following bandwidths: 1.25, 2.5, 5, 10, or 20 Mhz.

The frequency band used for communication with each terminal when the entire system band is expanded by carrier aggregation is defined in units of component carriers. Terminal A can use 100 MHz, which is the entire system band, and performs communication using all five component carriers. The terminals B1 to B5 can use only a 20 MHz bandwidth and perform communication using one component carrier. Terminals C ₁ and C ₂ can use a 40 MHz bandwidth and each communicate using two component carriers. The two component carriers may be logically / physically adjacent or non-contiguous. The terminal C ₁ shows a case in which two non-adjacent component carriers are used and the terminal C ₂ shows a case in which two adjacent component carriers are used.

In the LTE system, one downlink component carrier and one uplink component carrier are used, while in the LTE-A system, a plurality of component carriers can be used as shown in FIG. A combination of a downlink component carrier or a corresponding downlink component carrier and a corresponding uplink component carrier may be referred to as a cell and a corresponding relationship between a downlink component carrier and an uplink component carrier may be indicated through system information .

At this time, the scheme of scheduling the data channel by the control channel may be classified into a link carrier scheduling method and a cross carrier scheduling method.

More specifically, link carrier scheduling schedules data channels only through the particular component carrier, such as existing LTE systems that use a single component carrier, over a particular component carrier. That is, the downlink grant / uplink grant transmitted to the PDCCH region of the downlink component carrier of a specific component carrier (or specific cell) can be scheduled only for the PDSCH / PUSCH of the cell to which the corresponding downlink component carrier belongs. That is, the search space, which is an area for attempting to detect the downlink grant / uplink grant, exists in the PDCCH region of the cell where the PDSCH / PUSCH to be scheduled is located.

On the other hand, in the cross carrier scheduling, when a control channel transmitted through a primary component carrier (Primary CC) using a Carrier Indicator Field (CIF) is transmitted through the main component carrier or through another component carrier Schedules the channel. In other words, a monitored cell (Monitored Cell or Monitored CC) of the cross-carrier scheduling is set, and the downlink grant / uplink grant transmitted in the PDCCH region of the monitored cell is set to PDSCH / PUSCH of a cell set to be scheduled in the corresponding cell Scheduling. That is, a search area for a plurality of component carriers is present in a PDCCH area of a cell to be monitored. Among the plurality of cells, system information is transmitted, an initial access attempt is made, and the PCell is set by transmission of uplink control information. The PCell is a downlink main component carrier and an uplink main component carrier corresponding to the downlink main component carrier .

9 is a diagram for explaining single carrier communication and multiple carrier communication. Particularly, FIG. 9A shows a subframe structure of a single carrier and FIG. 9B shows a subframe structure of multiple carriers.

Referring to FIG. 9A, a general wireless communication system performs data transmission or reception (in a frequency division duplex (FDD) mode) through one DL band and one UL band corresponding thereto , A radio frame is divided into an uplink time unit and a downlink time unit in a time domain and data transmission or reception is performed through an uplink / downlink time unit (time division duplex , TDD) mode). However, in recent wireless communication systems, introduction of a carrier aggregation technique using a larger UL / DL bandwidth by collecting a plurality of UL and / or DL frequency blocks in order to use a wider frequency band is being discussed. Carrier aggregation is an orthogonal frequency division multiplexing (OFDM) scheme that performs DL or UL communication by putting a fundamental frequency band divided into a plurality of orthogonal subcarriers on one carrier frequency in that DL or UL communication is performed using a plurality of carrier frequencies division multiplexing system. Hereinafter, each of the carriers collected by carrier aggregation is referred to as a component carrier (CC). Referring to FIG. 9 (b), three 20 MHz CCs can be grouped into UL and DL, respectively, so that a bandwidth of 60 MHz can be supported. Each CC may be adjacent or non-adjacent to one another in the frequency domain. FIG. 9B shows a case where the bandwidth of the UL CC and the bandwidth of the DL CC are the same and symmetric, but the bandwidth of each CC can be determined independently. Asymmetric carrier aggregation in which the number of UL CCs is different from the number of DL CCs is also possible. A DL / UL CC specific to a particular UE may be referred to as a configured serving UL / DL CC in a particular UE.

The eNB may be used to communicate with the UE by activating some or all of the serving CCs configured in the UE, or by deactivating some CCs. The eNB can change the CC to be activated / deactivated, and can change the number of CCs to be activated / deactivated. When the eNB allocates a CC available for the UE in a cell-specific or UE-specific manner, at least one of the assigned CCs is used, as long as the CC allocation for the UE is not completely reconfigured or the UE does not perform a handover. One is not disabled. A CC that is not deactivated is referred to as a primary CC (PCC), and a CC that can be freely activated / deactivated by the eNB is called a secondary CC (SCC), unless it is a full reconfiguration of the CC assignment to the UE It is called. PCC and SCC may be distinguished based on control information. For example, specific control information may be set to be transmitted and received only via a specific CC, which may be referred to as PCC and the remaining CC (s) as SCC (s).

Meanwhile, 3GPP LTE (-A) uses the concept of a cell to manage radio resources. A cell is defined as a combination of DL resources and UL resources, that is, a combination of DL CC and UL CC. A cell may consist of DL resources alone, or a combination of DL resources and UL resources. If carrier aggregation is supported, the linkage between the carrier frequency of the DL resource (or DL CC) and the carrier frequency of the UL resource (or UL CC) . For example, a combination of a DL resource and a UL resource can be indicated by linkage of System Information Block Type 2 (SIB2). Here, the carrier frequency means a center frequency of each cell or CC. In the following,

a cell operating on a frequency is referred to as a primary cell or a PCC and a cell operating on a secondary frequency (or SCC) is referred to as a secondary cell (SCell) It is called. The carrier corresponding to PCell in the downlink is referred to as a downlink primary CC (DL PCC), and the carrier corresponding to PCell in the uplink is referred to as a UL primary CC (DL PCC). SCell refers to a cell that is configurable after a Radio Resource Control (RRC) connection is established and can be used to provide additional radio resources. Depending on the capabilities of the UE, a SCell may form together with the PCell a set of serving cells for the UE. The carrier corresponding to the SCell in the downlink is referred to as DL secondary CC (DL SCC), and the carrier corresponding to the SCell in the uplink is referred to as UL secondary CC (UL SCC)

do. For UEs that are in the RRC_CONNECTED state but no carrier aggregation is set or that do not support carrier aggregation, there is only one serving cell consisting of only PCell.

As previously mentioned, the term cell used in carrier aggregation is distinguished from the term cell, which refers to a geographical area in which a communication service is provided by a single eNB or a group of antennas. In order to distinguish between a cell designating a certain geographical area and a cell of carrier aggregation, a carrier aggregation cell is referred to as a CC and a cell in a geographical area is referred to as a cell. Quot;

In the existing LTE / LTE-A system, when multiple CCs are used together, it is assumed that the UL / DL frame time synchronization of the SCC coincides with the time synchronization of the PCC, assuming that the CCs that are not so far away in the frequency domain are clustered. However, there is a possibility that a plurality of CCs belonging to different frequency bands or spaced apart from each other in frequency, that is, a plurality of CCs having different propagation characteristics, may be gathered in the future. In this case, assuming that the time synchronization of the PCC and the time synchronization of the SCC are the same as in the conventional case, the synchronization of the DL / UL signal of the SCC may be seriously adversely affected.

Meanwhile, in the case of the LCT CC, among the radio resources operating in the LCT CC, radio resources available for transmission / reception of physical uplink / downlink channels and radio resources available for transmission / reception of physical uplink / The resources, as described above, are predetermined. In other words, the LCT CC is not configured to carry physical channels / signals through arbitrary time frequency in arbitrary time resources, but may be configured to transmit the physical channel / Signal should be configured to carry. For example, the physical downlink control channels may be configured only in the first OFDM symbol (s) of the OFDM symbols in the DL subframe, and the PDSCH may include the first OFDM symbol (s) that are likely to be mapped physical downlink control channels. Lt; / RTI > As another example, the CRS (s) corresponding to the antenna port (s) of the eNB are transmitted every subframe in the REs shown in Fig. 6 over the entire band regardless of the DL BW of the eNB. Accordingly, when the number of antenna ports of the eNB is 1, REs indicated by '0' in FIG. 6 are '0', '1', '2' and ' 3 'can not be used for other downlink signal transmission. In addition, there are various constraints on the composition of the LCT CC, and these constraints are greatly increased as the communication system develops. Some of these constraints arise because of the level of communication technology at the time the constraint is created, and there are some constraints that are unnecessary as communication technology develops, and constraints of existing and new technologies for the same purpose It may be present at the same time. As the constraints become so large, the constraints introduced for the development of the communication system are making the wireless resources of the CC ineffective. Therefore, the introduction of NCT CC, which can be constructed according to the simplified constraints rather than the existing constraints, is free from the constraints that are unnecessary according to the development of the communication technology. Since the NCT CC is not constructed according to the constraints of the existing system, it can not be recognized by the UE implemented according to the existing system. Hereinafter, UEs which are implemented according to the existing system and can not support NCT CC are called legacy UEs, and UEs implemented to support NCT CCs are called NCT UEs.

It is considered that NCT CC will be used as SCC in LTE-A system in the future. Since the NCT CC does not consider use by the legacy UE, the legacy UE does not need to perform cell search, cell selection, cell reselection, etc. in the NCT CC. If the NCT CC is not used as a PCC and the NCT CC is used only as an SCC, unnecessary constraints on the SCC can be reduced compared to an existing LCT CC that can be used as a PCC, enabling more efficient use of the CC. However, the time / frequency synchronization of the NCT CC may not coincide with the synchronization of the PCC. Even if the time / frequency synchronization of the NCT CC is obtained once, the time / frequency synchronization may be changed according to the change of the communication environment. An RS in which time synchronization and / or frequency synchronization can be used for tracking is required. An RS is also needed to allow the UE to detect the NCT CC in the neighbor cell search process. CRS can be used for purposes such as time / frequency synchronization of NCT CC and neighbor cell search using NCT CC. The CRS may be configured in the NCT CC in the same manner as in the existing LTE / LTE-A system shown in FIG. 6 and may have a smaller density in the time axis or frequency axis than the existing LTE / LTE- It may be configured in the NCT CC.

In the present invention, it is proposed that the CRS on the NCT CC is configured to have a lower density on the time axis than the CRS on the LCT CC of the existing LTE / LTE-A system. Accordingly, in the present invention, the NCT CC includes a constraint condition that the CRS is configured in the corresponding CC for every DL subframe, a constraint condition that the CRS is configured in the CC for each antenna port of the eNB, a predetermined number of OFDM It may not satisfy at least one of the constraint conditions that the symbol should be reserved for transmission of the control channel such as the PDCCH over the frequency band of the corresponding CC. For example, on the NCT CC, a CRS may be configured for every predetermined number (> 1) of subframes, not every subframe. Or, on the NCT CC, only the CRS for one antenna port (e.g., antenna port 0) can be configured regardless of the number of antenna ports of the eNB. The CRS of the present invention may not be used for data demodulation unlike the existing CRS shown in FIG. Therefore, instead of the existing CRS used for channel state measurement and demodulation, a tracking RS is newly defined for tracking of time synchronization and / or frequency synchronization, and the tracking RS is added to some subframes and / or some frequency resources on the NCT CC Lt; / RTI > Alternatively, the PDSCH may be configured in the leading OFDM symbols on the NCT CC, the PDCCH may be configured in the existing PDSCH region other than the initial OFDM symbols, or the PDCCH may be configured using some frequency resources. Hereinafter, unlike the existing LTE / LTE-A system, unlike the existing LTE / LTE-A system, the RSs transmitted in some subframes can be used in common by any UE regardless of the name, such as time synchronization and / or frequency synchronization of the NCT CC, RS (common RS, CRS).

10 is a diagram showing an example in which a cross carrier scheduling technique is applied. In particular, in FIG. 10, the number of allocated cells (or component carriers or component carriers) is three and the cross carrier scheduling technique is performed using CIF as described above. Here, it is assumed that the downlink cell # 0 is a downlink main component carrier (i.e., a primary cell, PCell) and the remaining component carriers # 1 and # 2 are subsidiary components (i.e., a secondary cell, SCell).

In the present invention, an effective management method of uplink resources for a main component carrier (primary component carrier, primary cell or PCell) or a subsidiary component carrier (secondary component carrier or secondary cell or SCell) during a carrier aggregation operation I suggest. Hereinafter, the case where the terminal operates by merging two component carriers is explained, but it is obvious that the present invention can also be applied to the case of merging three or more component carriers.

11 is a diagram illustrating a deployment scenario of a UE and a BS in an LTE and LAA service environment.

In the frequency band targeted by the LAA service environment, the wireless communication distance is not long due to the high frequency characteristics. In consideration of this, the deployment scenario between the terminal and the base station in the environment where the existing LTE-licensed service and the LAA service coexist is the overlay model shown on the left side of FIG. 11 and the overlay model shown in the right side of FIG. or a co-located model.

In the case of the overlay model shown in the left side of FIG. 11, the macro eNB performs wireless communication with the X terminal and the X 'terminal in the macro area 32 using a licensed carrier, and a plurality of RRHs and an X2 interface Lt; / RTI > Each RRH may perform wireless communication with an X terminal or an X 'terminal in a certain area 31 using an unlicensed carrier. In this case, there is no mutual interference between the macro eNB and the RRH. However, in order to use the LAA service as an auxiliary downlink channel of the LTE-licensed service through carrier aggregation, an X2 interface between the macro eNB and the RRH A fast data exchange should be made.

In the case of the co-located model shown on the right-hand side of FIG. 11, the pico / femto eNB can perform wireless communication with the Y terminal simultaneously using an authorized carrier and an unauthorized carrier. However, the use of the LTE service and the LAA service together is considered in the downlink data transmission. In this case, coverage for LTE service and coverage for LAA service may differ depending on frequency band, transmission power, and the like.

A terminal according to an embodiment of the present invention can be implemented by various types of wireless communication devices or computing devices that are guaranteed to be portable and mobility.

The base station according to the embodiment of the present invention controls and manages a cell (for example, a macro cell, a femtocell, a picocell, etc.) corresponding to a service area and transmits a signal, channel designation, channel monitoring, Can be performed.

12 is a block diagram showing the configuration of a terminal and a base station according to an embodiment of the present invention.

As shown, a terminal 100 according to an embodiment of the present invention may include a processor 110, a communication module 120, a memory 130, a user interface unit 140, and a display unit 150 have.

First, the processor 110 may execute various commands or programs, and may process data inside the terminal 100. [ In addition, the processor 100 can control the entire operation including each unit of the terminal 100, and can control data transmission / reception between the units.

Next, the communication module 120 may be an integrated module that performs wireless communication using a wireless communication network and wireless LAN connection using a wireless LAN. To this end, the communication module 120 may include a plurality of network interface cards such as the cellular communication interface cards 121 and 122 and the wireless LAN interface card 123, either internally or externally. 12, the communication module 120 is shown as an integrated integrated module, but each network interface card may be independently arranged according to the circuit configuration or use, unlike in FIG.

The cellular communication interface card 121 according to the first frequency band transmits and receives a radio signal with at least one of the base station 200, the external device, and the server using the mobile communication network, Band cellular communication service. Here, the wireless signal may include various types of data or information such as a voice call signal, a video call signal, or a text / multimedia message.

According to an embodiment of the present invention, the cellular communication interface card 121 by the first frequency band may include at least one NIC module using the LTE-Licensed frequency band. According to an embodiment of the present invention, at least one NIC module performs cellular communication with at least one of the base station 200, the external device, and the server independently in accordance with the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module . The cellular communication interface card 121 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the terminal 100. [

The cellular communication interface card 122 in the second frequency band transmits and receives a radio signal to and from a base station 200, an external device, and a server using a mobile communication network, Band cellular communication service. According to an embodiment of the present invention, the cellular communication interface card 122 by the second frequency band may include at least one NIC module using the LTE-Unlicensed frequency band. For example, the LTE-Unlicensed frequency band may be a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, at least one NIC module performs cellular communication with at least one of the base station 200, the external device, and the server independently in accordance with the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module . The cellular communication interface card 122 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the terminal 100. [

The wireless LAN interface card 123 according to the second frequency band transmits and receives a radio signal to at least one of the base station 200, the external device, and the server through the wireless LAN connection, Band wireless LAN service. According to an embodiment of the present invention, the wireless LAN interface card 123 according to the second frequency band may include at least one NIC module using the wireless LAN frequency band. For example, the WLAN frequency band may be an unlicensed radio band such as a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, at least one NIC module performs wireless communication with at least one of the base station 200, the external device, and the server independently in accordance with a wireless LAN standard or protocol of a frequency band supported by the corresponding NIC module . The wireless LAN interface card 123 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the terminal 100. [

According to an embodiment of the present invention, the processor 110 transmits information on whether or not the wireless LAN communication service of the second frequency band is available through the cellular communication channel of the first frequency band with the base station 200, Information on the period of time. Here, the information on the predetermined period is information set for receiving the downlink data from the base station 200 through the cellular communication channel of the second frequency band.

In addition, according to an embodiment of the present invention, since the base station 200 supports a wireless LAN communication service, the processor 110 can receive a predetermined signal from the base station 200 through a wireless LAN communication channel of a second frequency band And receives the base station coexistence message including information on the period.

In addition, according to an embodiment of the present invention, the processor 110 may be configured to transmit, in response to the received base station coexistence message, The terminal transmits a terminal coexistence message including information on a predetermined period according to a standard or protocol specified in the wireless LAN communication service of the second frequency band.

Also, according to an embodiment of the present invention, the processor 110 receives downlink data from the base station 200 for a predetermined period through a cellular communication channel of a second frequency band.

Next, the memory 130 stores a control program used in the terminal 100 and various data corresponding thereto. The control program may include a predetermined program required for the terminal 100 to perform wireless communication with at least one of the base station 200, the external device, and the server.

Next, the user interface 140 includes various types of input / output means provided in the terminal 100. That is, the user interface 140 can receive user input using various input means, and the processor 110 can control the terminal 100 based on the received user input. In addition, the user interface 140 may perform output based on instructions of the processor 110 using various output means.

Next, the display unit 150 outputs various images on the display screen. The display unit 150 may output various display objects such as a content executed by the processor 110 or a user interface based on a control command of the processor 110. [

12, the base station 200 according to an exemplary embodiment of the present invention may include a processor 210, a communication module 220, and a memory 230. In addition,

First, the processor 210 may execute various commands or programs and may process data within the base station 200. In addition, the processor 210 can control the entire operation including each unit of the base station 200, and can control data transmission / reception between the units.

Next, the communication module 220 may be an integrated module for performing mobile communication using a mobile communication network and wireless LAN connection using a wireless LAN, such as the communication module 120 of the terminal 100 described above. To this end, the communication module 120 may include a plurality of network interface cards, such as the cellular communication interface cards 221 and 222 and the wireless LAN interface card 223, either internally or externally. 12, the communication module 220 is shown as an integrated integration module, but each network interface card may be independently arranged according to the circuit configuration or use, unlike in FIG.

The cellular communication interface card 221 according to the first frequency band transmits and receives a radio signal to at least one of the terminal 100, the external device, and the server using the mobile communication network, And provides cellular communication service by one frequency band. Here, the wireless signal may include various types of data or information such as a voice call signal, a video call signal, or a text / multimedia message.

According to an embodiment of the present invention, the cellular communication interface card 221 by the first frequency band may include at least one NIC module using the LTE-Licensed frequency band. According to an embodiment of the present invention, the at least one NIC module can perform cellular communication with at least one of the terminal 100, the external device, and the server independently according to the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module. Can be performed. The cellular communication interface card 221 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the base station 200.

The cellular communication interface card 222 according to the second frequency band transmits and receives a radio signal to at least one of the terminal 100, the external device, and the server using the mobile communication network, And provides a cellular communication service by two frequency bands. According to an embodiment of the present invention, the cellular communication interface card 222 by the second frequency band may include at least one NIC module using the LTE-Unlicensed frequency band. For example, the LTE-Unlicensed frequency band may be a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, the at least one NIC module can perform cellular communication with at least one of the terminal 100, the external device, and the server independently according to the cellular communication standard or protocol of the frequency band supported by the corresponding NIC module. Can be performed. The cellular communication interface card 222 may operate only one NIC module at a time or may operate a plurality of NIC modules at the same time according to the performance and requirements of the base station 200. [

The wireless LAN interface card 223 according to the second frequency band transmits and receives a wireless signal to at least one of the terminal 100, the external device, and the server through the wireless LAN connection, 2 frequency band. According to an embodiment of the present invention, the wireless LAN interface card 223 according to the second frequency band may include at least one NIC module using the wireless LAN frequency band. For example, the WLAN frequency band may be an unlicensed radio band such as a band of 2.4 GHz or 5 GHz. According to an embodiment of the present invention, at least one NIC module independently communicates with at least one of the terminal 100, the external device, and the server in accordance with a wireless LAN standard or protocol of a frequency band supported by the corresponding NIC module Can be performed. The wireless LAN interface card 223 can operate only one NIC module at a time or operate a plurality of NIC modules at the same time according to the performance and requirements of the base station 200. [

According to an embodiment of the present invention, the processor 210 transmits information on whether or not the wireless LAN communication service of the second frequency band is available through the cellular communication channel of the first frequency band with the terminal 100, Information on the period of time. Here, the information on the predetermined period is information set for transmitting the downlink data to the terminal 100 through the cellular communication channel of the second frequency band.

In addition, according to an embodiment of the present invention, the processor 210 may be a peripheral terminal capable of communicating with the base station 200 through the terminal 100 and the wireless LAN communication service of the second frequency band, And transmits the base station coexistence message including information on a predetermined period according to a standard or protocol defined in the wireless LAN communication service to the terminal 100 for a predetermined period on the cellular communication channel of the second frequency band, .

In addition, according to an embodiment of the present invention, since the terminal 100 supports the wireless LAN communication service, the processor 210 transmits the base station coexistence message Lt; RTI ID = 0.0 > coexistence < / RTI > Here, the terminal coexistence message includes information on a predetermined period.

The terminal 100 and the base station 200 shown in FIG. 12 are block diagrams according to an embodiment of the present invention. Blocks that are separately displayed are logically distinguished from elements of a device. Thus, the elements of the device described above can be mounted as one chip or as a plurality of chips depending on the design of the device. In addition, in the embodiment of the present invention, some components of the terminal 100, such as the user interface 140 and the display unit 150, may be optionally provided in the terminal 100. In addition, in the embodiment of the present invention, the user interface 140, the display unit 150, and the like may be additionally provided to the base station 200 as needed.

The definitions of slots and mini-slots in NR are as follows. First, the basic transmission unit on the time axis in NR can be defined as a slot, and the number of OFDM symbols that can be allocated to one slot can be set differently according to the subcarrier spacing. When 15kHz is used as the reference subcarrier spacing The number of OFDM symbols in the slot of the slot may be 7 or 14. If subcarrier spacing of 30 kHz is considered considering different reference subcarrier spacing in the reference frame structure, the number of OFDM symbols per slot may be 14.

When the URLLC transmission and the eMBB data are transmitted to the scheduled time / frequency resource, transmission in mini-slot units can be performed. Here, the length of the mini-slot may be from "1 symbol" to "symbol length occupied in the slot-1". When the data length of URLLC is considered to be mainly in 2 symbol units or 7 symbol units in consideration of slot size, multiplexing with URLLC transmission with eMBB data based on the length of mini-slots in units of 2 symbols or 7 symbols The method can be considered.

The PDCCH, PDSCH, DMRS, PUSCH, PUCCH and the like denoted in the description of the present invention refer to a channel and a reference signal for NR (New Radio), which is interpreted differently from PDCCH, PDSCH, DMRS, PUSCH, and PUCCH in LTE . NR-PDCCH, NR-PDSCH, NR-DMRS, NR-PUSCH, and NR-PUCCH.

The present invention relates to a method and an apparatus for estimating data transmission by sharing control information between a terminal and a base station, and also relates to a method and apparatus for estimating a data transmission in a slot- (I.e., slot-UE (s)) to the DM-RS receiving the resource allocation information.

FIG. 13 is a diagram illustrating one embodiment of a slot structure and a demodulation reference signal (DM-RS) pattern for a base station to transmit and receive at a terminal.

Referring to FIG. 13, an RB having 12 subcarriers and 14 OFDM symbols as a frame structure for NR includes a PDCCH for transmitting downlink or uplink control information, a PDSCH for transmitting downlink data, and a PDSCH for receiving PDSCH And a DM-RS as a demodulation reference signal. 13, which is an example of an embodiment, PDCCH is allocated to the first two OFDM symbols and PDSCH and DM-RS are allocated to the remaining 12 OFDM symbols. However, unlike the structure, PDCCH is allocated to the first OFDM symbol and PDSCH and DM-RS are allocated in the remaining 13 OFDM symbols, and various embodiments may be possible depending on the number of OFDM symbols to which the PDCCH is allocated. Also, various embodiments may be considered for the pattern of the demodulation reference signal and the DM-RS for receiving the PDSCH. However, the present invention will be described based on the embodiment shown in FIG. The DM-RS and the PDSCH may be precoded according to the channel environment of the Slot-UE to which the corresponding RB is allocated. The above RB structure is assumed to facilitate the description of the present invention and can be applied to a mobile communication system having other types of RBs.

For the sake of explanation of the present invention, it is assumed that there are four DM-RS patterns that can be used for a slot-UE in a base station or a gNB according to the channel condition of the UE. When the Doppler value as a channel variation to the time axis of the Slot-UE is relatively low and the gNB transmits signals using the two antenna ports to the corresponding slot-UE, the gNB can allocate DM-RS pattern 1. When the Slot-UE's Doppler value is relatively high and the gNB sends signals to the corresponding slot-UE using two antenna ports, the gNB can allocate DM-RS pattern 2. When the Slot-UE's Doppler value is relatively low and the gNB sends signals to the corresponding slot-UE using four antenna ports, the gNB can allocate DM-RS pattern 3. When the Slop-UE's Doppler value is relatively high and the gNB sends signals to the slot-UE using four antenna ports, the gNB can allocate DM-RS pattern 4. Referring to FIG. 13, the gNB informs the Slot-UE of the DM-RS suitable for the channel environment through the PDCCH or through the RRC signal. The DMRS pattern is assumed to facilitate the description of the present invention. The present invention can be applied when a base station can allocate different DM-RS patterns to slot-UEs.

Referring to FIG. 13, the DM-RS patterns 1 and 3 may include DM-RSs in the 3 rd and 9 th OFDM symbols in one slot. Also, a DM-RS pattern in a slot may include a DM-RS in the 3, 6, 9, and 12 th OFDM symbols 2 and 4. Within a PRB, DM-RS patterns 1 and 2 may be located at positions 5, 6, 11, and 12 of the subcarrier. Also, DM-RS patterns 3 and 4 in a PRB can be located at 3, 4, 5, 6, 9, 10, 11, and 12 subcarriers. Referring to FIG. 13, DM-RS pattern 1 has the lowest density or overhead, and DM-RS pattern 4 has the highest DM-RS density or overhead.

The base station may multiplex the eMBB data and the URLLC data to different users to transmit data suitable for the UE requesting the eMBB service less sensitive to the delay time and the UE requesting the delay time sensitive URLLC service . A UE requesting an eMBB service has a relatively large delay time required to be transmitted, and the data payload size to be transmitted is large, so that data can be received by scheduling based on a slot basis. This UE is called a slot-UE. However, since the UE requesting the URLLC service has a relatively small delay time and the data payload size to be transmitted is small, slot-based scheduling is inefficient or can not satisfy the delay time requirement. Therefore, a UE requesting a URLLC service can receive data by scheduling based on a mini-slot having a scheduling period shorter than a slot. This UE is called a mini-slot UE.

FIG. 14 is a diagram showing a slot and a Mini-slot multiplexed. FIG.

Referring to FIG. 14, the base station can multiplex the transmission to the slot-UE and the mini-slot UE and transmit the multiplexed time-frequency resource to the slot-UE, In order to transmit a time-sensitive data channel and a control channel or a signal, a slot-UE can allocate a part of time and frequency resources already allocated to a Mini-slot UE. The structure of the mini-slot is composed of mPDCCH as a control channel for downlink transmission to the mini-slot UE, mPDSCH to transmit downlink data to the mini-slot UE, and mDM-RS to receive mPDSCH . In the present invention, a Mini-slot is used to transmit a low-delay service in one embodiment, and therefore, a mini-slot composed of two OFDM symbols is considered. However, a mini-slot composed of four or seven OFDM symbols And can be applied to the present invention. Mini-slots are also used to transmit high-reliability services, which can occupy a wide frequency band.

The starting position of the Mini-slot on the time axis may vary depending on the delay time requirements. For example, for low-latency services, puncturing / superpositioning of the resources of the Slot-UE as quickly as possible (transmitting different data over the same time and frequency resources, eg, performing phase roaming on different data A method of setting to transmit with different constellation, etc.), and it is necessary to transmit to the mini-slot UE. At this time, since the slot-UE does not receive information to be received, the reception performance deteriorates. More seriously, if the DM-RS or PDCCH for the slot-UE (s) is punctured, the slot-UE will also fail to receive the PDSCH transmitted to the non-punctured resource. In order to avoid this, FIG. 15 shows a mini-slot located at an OFDM symbol position without DM-RS. Referring to FIG. 15, a base station can generate a mini-slot by bypassing a DM-RS and a PDCCH allocated to a Slot-UE. The starting position of the Mini-slot based on the DM-RS pattern 2 or 4 with the highest DM-RS density on the time axis may be the 4th, 7th, 10th, and 13th OFDM symbols. Since the base station knows the location of the PDCCH and the DMRS in the corresponding slot, it can be configured to transmit the mini-slot by avoiding the location of the corresponding DMRS and the PDCCH. In addition, It is not possible to know whether the mini-slot UE is able to receive the transmission allocated to the mini-slot. Therefore, the Node B can determine the overhead of the maximum PDCCH that the UE can assume, A method of transmitting the mPDCCH, mPDSCH, and mDM-RS to the mini-slot UE by setting the start position of the mini-slot considering the pattern of the RE can be used.

The mini-slot may start at any OFDM symbol in the slot to satisfy the delay time requirements. 16 is a diagram illustrating a case where a minislot is located at a position of an OFDM symbol with a DM-RS according to an embodiment of the present invention. Referring to FIG. 16 (b), the PDSCH and the DM-RS of the Slot-UE can be punctured as described above. Referring to FIG. 16 (a), only the PDSCH of the Slot-UE is punctured and the DM-RS may not puncture. 16 (a), the Slot-UE uses DM-RS pattern 2, and when a Mini-slot is composed of two OFDM symbols starting from the 8th OFDM symbol and transmitted, It is possible to perform only puncturing of the RE in the resource to which another mini slot is allocated without puncturing the DM-RS of the 9th OFDM symbol position. In FIG. 16 (a), only one of the remaining 20 REs can be punctured in an example of one RB. Since the DM-RS of the Slot-UE is not punctured, the Slot-UE performs channel estimation using all the DM-RS including the DM-RS, and receives the PDSCH transmitted in the RE other than the punctured RE It is possible to receive the PDSCH by performing channel estimation and PDSCH demodulation in the same manner in the absence of a mini slot. Therefore, it is possible to prevent the serious reception performance deterioration of the PDSCH that the Slot-UE receives. However, since 4 REs of 24 REs are not punctured from the point of view of a Mini-slot-UE, a wider frequency band should be used to satisfy the high reliability condition.

FIG. 17 is a diagram illustrating a method for changing a DM-RS position configured in a slot according to a position of a mini-slot allocated for a mini-slot UE according to an embodiment of the present invention. 17, when the position of a mini-slot allocated for a mini-slot UE overlaps a PDSCH and a DM-RS of a slot-UE, the PDSCH of the slot- And the DM-RS punctured with the DM-RS and set to transmit for the slot-UE but not punctured, can be transmitted after the OFDM symbol assigned to the mini-slot. In the embodiment of FIG. 17, the DM-RS of the slot-UE allocated to the 9th OFDM symbol may be transmitted in the 10th OFDM symbol after mini-slot transmission. In this case, the DM-RS transmitted in the 10th OFDM symbol is transmitted on the same subcarrier as the DM-RS transmitted in the 9th OFDM symbol, and the same DM-RS sequence can be transmitted. From the point of view of a mini-slot UE, all REs of the OFDM symbol occupied by the mini-slot can be used regardless of the DM-RS pattern of the slot. From the point of view of the slot-UE, since the position of the DM-RS required for PDSCH decoding may vary, it is necessary to find the DM-RS position. Therefore, finding the DM-RS for each OFDM symbol causes high energy consumption for the slot-UE.

FIG. 18 is a diagram illustrating another CRC used for notifying a DM-RS position change of a slot according to an embodiment of the present invention. Referring to FIG. 18, a PDSCH and a DM-RS of a slot-UE are punctured for mini-slot transmission for a mini-slot UE, and a DM-RS that is not transmitted is allocated to a mini-slot according to an embodiment of the present invention , It can inform the CRC of the CB that the DM-RS position has changed when transmitting after the OFDM symbol. The base station may have two CRC masks, CRC0 and CRC1. Here, CRC0 may indicate that the DM-RS of the previously transmitted OFDM symbols in the slot is in a predetermined position. The CRC1 may indicate that the DM-RS of the OFDM symbols transmitted in the slot is not located at the predetermined location but the DM-RS has been relocated to the OFDM symbol due to the mini-slot transmission. Referring to FIG. 18, the base station uses CRC0 as the CRC mask of the transmitting CB, that is, CB0 to CBm-1 before knowing that the URLLC packet to be transmitted from the upper layer to the mini-slot has arrived, and after starting to know that the URLLC packet has arrived , CRC1 can be used as the CRC mask of the CB to be transmitted before the CB to be affected by the URLLC packet, that is, CBm to CBn. If the Slot-UE is masked with CRC1 as the CRC mask of the CB, the channel estimation can be performed using the DM-RS transmitted in the other DM-RS.

FIG. 19 is a diagram illustrating an mPDCCH as a control channel for mini-slot transmission allocated for a mini-slot UE according to an embodiment of the present invention, an mPDSCH as a data channel, and an RE (s) usable as an mDMRS. According to an embodiment of the present invention, the time and frequency resources allocated to the mini-slots are generated at positions where the DM-RS RE position / RE number (or density) varies according to the DM-RS pattern of the slot , The allocation of the mini-slots may be used differentially to avoid affecting the DM-RS of the slot-UE. Referring to FIG. 19, an RE that may be potentially used by all possible DM-RS patterns is denoted by 'x', and an RE that has no room to allocate a DM-RS is denoted by 'o'. In accordance with an embodiment of the present invention, the REs marked 'o' may be used as mPDCCH or mDM-RS for mini-slot-UE. However, since the REs indicated by 'x' are potentially allocated to the DM-RS of the slot-UE, it is possible to prevent deterioration of reception performance for the PDSCH of the slot-UE and to prevent degradation of reception performance of mini-slot UEs it can be set not to be used as mPDCCH or mDM-RS in order to prevent deterioration of reception performance of mPDCCH or mDM-RS. For example, when assigned to DM-RS pattern 4, all of the REs indicated by 'x' are used as the DM-RS of the slot-UE. For example, when assigned to DM-RS pattern 2, half of the RE indicated by 'x' is used as the DM-RS of the slot-UE. For reference, a different slot-UE (s) may have different DM-RS patterns, and mini-slot-UEs receiving resources assigned to mini-slots to which RBs are assigned each slot- , It can not be determined which RE among the REs indicated by 'x' is used as the DM-RS of the slot-UE (s). The present invention will be described later on how to use REs indicated by 'x'.

mPDCCH  indication

20 is a diagram illustrating an available RE for mPDSCH transmission with a mPDCCH of a minislot user according to an embodiment of the present invention. Here, mPDCCH and mDMRS are the maximum DMs that can be assumed to be able to transmit to the slot-UE in the slot because the mini-slot UE can not know the location of the DM-RS used in the slot-UE before receiving the corresponding mPDCCH and mDMRS. The overhead of the RS is set so as not to overlap with the DMRS of the slot-UEs.

Referring to FIG. 20, a PRB or a number of PRBs may be grouped in a mini-slot mPDCCH to indicate a position of 'x' that can be used as a mini-slot, according to an embodiment of the present invention. More specifically, when four PRBs (PRB1, PRB2, PRB3, and PRB4) are allocated to two Slot-UEs in FIG. 20, two PRBs may be combined to inform the DM-RS pattern of the slot-UE. Slot-UE 1 can occupy three PRBs (PRB1, PRB2, PRB3), and Slot-UE2 can occupy one PRB (PRB4). Slot-UE 1 uses DM-RS pattern 2 allocated from the base station, and Slot-UE 2 uses DM-RS pattern 1 allocated from the base station. Since DM-RS pattern 2 is allocated to PRB1 and PRB2, the information is reported on the mPDCCH. Since DM-RS patterns 2 and 1 are assigned to PRB3 and PRB4, the DM-RS pattern 2 information arranged at a higher density is reported on the mPDCCH. A mini-slot UE can know which RE among the REs indicated by 'x' using the mPDCCH and mDM-RS allocated in the 'o' position of the mini-slot can be used for transmission of mini-slots (eg mPDSCH) . For example, in PRB4, the RE indicated by 'x' is not used as the DM-RS of the slot-UE, but since it informs that the mPDCCH uses DM-RS pattern 2, it can not be used as a mini-slot transmission (eg mPDSCH) .

21 is a block diagram illustrating reception of mDMRS, mPDCCH, and mPDSCH in a mini-slot of a minislot user according to an embodiment of the present invention. Referring to FIG. 21, the process of receiving the mPDSCH in the mini-slot UE includes i) performing channel estimation using an mDM-RS allocated to an RE at an 'o' position; ii) find the DM-RS pattern of PRBs or several bundled PRBs that have been identified in the mPDCCH by receiving the mPDCCH assigned to the RE at the 'o' position, and iii) use the RE and 'x' Lt; RTI ID = 0.0 > mPDSCH < / RTI > of the mini-slot UE.

Phase rotated constellation

22 is a diagram illustrating a phase rotation of an mPDSCH of a URLLC according to a DM-RS density of a slot according to an embodiment of the present invention. In another embodiment of the present invention, referring to FIG. 22, the DM-RS pattern value of the corresponding RB can be informed through the constellation phase rotation value of RE indicated by 'o' in the mini-slot. More specifically, referring to FIG. 22, when using QPSK constellation and DM-RS pattern 4 when using DM-RS pattern 1 and QPSK constellation when transmitting mPDSCH for mini-slot UE using QPSK, Can be transmitted by performing phase ratation as much as. The mini-slot UE can estimate the constellation phase rotation values of every PRB or several PRBs to find a DM-RS pattern used in the PRB or several PRBs.

CRC  indication

23 is a diagram illustrating CRC of a code block according to DM-RS density of a slot according to an exemplary embodiment of the present invention. According to another embodiment of the present invention, the base station can transmit the data transmitted to the mini-slot UE by dividing the data into the 1st m PDSCH and the 2nd m PDSCH. The first m PDSCH and the second m PDSCH may have one CB and a CRC, respectively. The CB and the CRC corresponding to the 1st m PDSCH can be transmitted through the RE indicated by 'o', and the CB corresponding to the 2nd m PDSCH and the CRC can be transmitted to the slot-UE corresponding to 'x' RE or a portion thereof. The position of the RE or a part thereof corresponding to the 'm' to which the second mPDSCH is mapped to the CRC is known through the CRC mask of the first m PDSCH. In one embodiment, if the CRC mask is CRC0, then all PRBs may be informed that DM-RS pattern 1 has been used. If the CRC mask is CRC1, then all PRBs can indicate that DM-RS pattern 2 is used. If the CRC mask is CRC2, then all PRBs can indicate that DM-RS pattern 3 is used. If the CRC mask is CRC3, then all PRBs can indicate that DM-RS pattern 4 is used. In this embodiment, the DM-RS pattern having the highest density among the DM-RSs used for all PRBs allocated with mini-slots can be informed. In addition, the PRB or several PRBs can be grouped together to give the DM-RS pattern with the highest density. Referring to FIG. 23, the UE receives the mDM-RS, mPDCCH, and mPDSCH of the RE corresponding to the 'o' position, and confirms the CRC of the 1st m PDSCH. If the CRC is a CRC that is not used by the base station in the mini-slot UE, the 1st mPDSCH reception fails and the reception can be terminated. If the CRC is one of the CRCs used for the mini-slot UE in the base station, it can be known which RE among the REs corresponding to 'x' transmitted the 2nd mPDSCH according to the CRC value. If the second mPDSCH is received and the CRC used for the mini-slot UE by the corresponding CRC is correct, the second mPDSCH is successfully received, and as a result, it can be determined that the two mPDSCHs are successfully received. If the CRC is not the CRC used for the mini-slot UE in the base station, it can be determined that the 2nd mPDSCH reception fails. According to the result, the HARQ process of the mini-slot UE can operate by combining the two mPDSCHs. Also, according to the result, the HARQ process of the mini-slot UE can operate for each mPDSCH.

Without indication

24 illustrates allocating an additional fewer parity bits according to an embodiment of the present invention.

According to one embodiment of the present invention, the mini-slot UE can utilize itself without notifying the available RE among the RE corresponding to 'x' with reference to FIG. The base station can allocate mDM-RS, mPDCCH, and mPDSCH to the RE corresponding to 'o'. The BS may select an available RE according to the DM-RS pattern among the REs corresponding to 'x' and allocate a channel code parity bead for decoding the mPDSCH to the REs.

In one embodiment, when the mini-slot starts from the 6th OFDM symbol, the 3, 4, 5, 6, 9, 10, 11, and 12 subcarrier positions of the 6th OFDM symbol are shifted according to the DM- DM-RS. Here, DM-RS patterns 3 and 4 do not use the third, fourth, 9th, and 10th subcarrier positions as the DM-RS. Therefore, if all the PRBs allocated with mini-slots are assigned to the DM-RS pattern 3 or 4, an RE corresponding to the 3, 4, 9, and 10 subcarrier positions of each PRB can be used. Also, if all the PRBs allocated with mini-slots are assigned to DM-RS pattern 1, RE corresponding to all 3, 4, 5, 6, 9, 10, 11, and 12 subcarrier positions of each PRB can be used. We define the set A = {3,4,9,10}, B = {5,6,11,12}. Note that the union of A and B contains RE marked by all 'x', and the intersection of two sets is empty. The BS can transmit the systematic bits and the parity bits of the channel code to the mPDSCH in the RE corresponding to 'o'. Let the parity bit be the first parity bit. When the PRBs occupied by the mini-slot have the DM-RS patterns 1, 2 and 3, the BS can transmit an additional parity bit to the RE corresponding to the set A of the RE corresponding to 'x'. Let the parity bit be the second parity bit. If the PRB occupied by the mini-slot includes the DM-RS pattern 4, the RE corresponding to the set A of the RE corresponding to 'x' is not used. When the PRBs occupied by the mini-slot have the DM-RS patterns 1 and 3, the BS can transmit an additional parity bit to the RE corresponding to the set B of the RE corresponding to 'x'. Let the parity bit be the third parity bit.

FIG. 25 is a block diagram of receiving an mPDSCH using a resource that can be additionally used by a minislot user according to an embodiment of the present invention. Referring to FIG. Referring to FIG. 25, the operation of the mini-slot UE may include the following steps. i) receiving mDM-RS, mPDCCH of RE corresponding to 'o' and decoding mPDSCH; ii) identifying the CRC included in the mPDSCH; iii) if the CRC is not valid, re-decoding the mPDSCH using the first additional parity bit that is likely to have been transmitted to the RE included in the set A among REs corresponding to 'x'; iv) verifying the CRC of the re-decoded mPDSCH; and v) if the CRC is not valid, decoding the mPDSCH using the second additional parity bit that is possibly transmitted to the RE included in the set B among the REs corresponding to 'x'. The Mini-slot UE can terminate decoding if the CRC of the mPDSCH decoded in each step is valid.

Used for slot- UE

26 is a diagram illustrating an RE that can be additionally used by a slot user according to an embodiment of the present invention. Referring to FIG. 26, an RE corresponding to 'x' may be allocated to a slot-UE according to an embodiment of the present invention. The Slot-UE can know the available RE among the REs corresponding to 'x' from the DM-RS pattern used by the Slot-UE. For example, in FIG. 26, it can be seen that the RE corresponding to the 5th, 6th, 11th, and 12th subcarriers of the 6th OFDM symbol can always be used regardless of whether a mini-slot exists or not. Therefore, even though the signal corresponding to the RE is always considered to be the slot-UE itself and the mini-slot is generated at the corresponding position, it can be used for PDSCH reception. However, since the slot-UE can not know the DM-RS pattern used by the other slot-UE, it can not know whether or not the RE corresponding to some 'x' can be used. In order to solve this problem, a method of separating the constellation of the RE corresponding to the slot after the mini-slot or the CRC mask transmitted after the mini-slot is applied similarly to the application to the mini-slot UE .

Referring to FIG. 27, a network may allocate some resources for purposes other than data transmission including Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH). For example, the network may allocate a synchronization signal and a physical broadcast channel (PBCH) for transmitting system information for initial cell access of the UE. The time-frequency region in which the synchronization signal and the physical broadcast channel (PBCH) are transmitted is called an SS / PBCH block. In one example, the SS / PBCH block may be configured as follows. That is, the SS / PBCH block may be composed of four consecutive symbols, and the first symbol may be composed of a primary synchronization signal (PSS). The third symbol may consist of a Secondary synchronization signal (SSS). The second symbol and the fourth symbol may be composed of PBCHs. The SS / PBCH block may consist of 288 consecutive sub-carriers on the frequency axis. More specifically, in the SS / PBCH block, the PSS and the SSS can be mapped to 144 sub-carriers among 288 sub-carriers, where 0, 1, ..., 7 out of 144 sub- 135, 136, ..., 143 sub-carriers are allocated 0s, and the remaining PSSs and SSS sequences having 127 lengths are allocated to 127 sub-carriers. The PBCH is allocated to 288 carriers in the SS / PBCH block. This may be one example, and other SS / PBCH block configurations may be possible. The length of the symbol of the PBCH may be greater than 2, and the mapping method in time units for PSS / SSS / PBCH is described as PSS-PBCH-SSS-PBCH in the above example. However, The time mapping may vary.

The location where the SS / PBCH block is allocated in the Half frame may be as follows.

 - 15 KHz subcarrier spacing: the first OFDM symbols of the candidate SS / PBCH blocks have indexes of {2, 8} + 14 * n. For carrier frequencies smaller than or equal to 3 GHz, n = 0, 1. For carrier frequencies greater than 3 GHz and less than or equal to 6 GHz, n = 0, 1, 2,

- 30 KHz subcarrier spacing: the first OFDM symbols of the candidate SS / PBCH blocks have indexes {4, 8, 16, 20} + 28 * n. For carrier frequencies less than or equal to 3 GHz, n = 0. For carrier frequencies greater than 3 GHz and less than or equal to 6 GHz, n = 0, 1.

- 30 KHz subcarrier spacing: the first OFDM symbols of the candidate SS / PBCH blocks have indexes {2, 8} + 14 * n. For carrier frequencies smaller than or equal to 3 GHz, n = 0, 1. For carrier frequencies greater than 3 GHz and less than or equal to 6 GHz, n = 0, 1, 2,

- 120 KHz subcarrier spacing: the first OFDM symbols of the candidate SS / PBCH blocks have indexes {4, 8, 16, 20} + 28 * n. For carrier frequencies greater than 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.

- 240 KHz subcarrier spacing: the first OFDM symbols of the candidate SS / PBCH blocks have indexes {8, 12, 16, 20, 32, 36, 40, 44} + 56 * n. For carrier frequencies greater than 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

Figure 27 shows the first slot in a half-frame at 15kHz sub-carrier spacing. Referring to FIG. 27, an SS / PBCH block may be allocated to OFDM symbol numbers 2, 3, 4 and 5 and OFDM symbol numbers 8, 9, 10 and 11 of a slot.

Apart from the SS / PBCH block, other time-frequency resources can be reserved for other purposes. The reserved resource may be transmitted as a cell-specific RRC signal or a UE-specific RRC signal. In addition, availability of the reserved resource may be additionally indicated to the UE through L1-signaling.

In describing this patent, the SS / PBCH block may be a time-frequency resource in which the PSS / SSS / PBCH described above are actually mapped and transmitted. That is, the first and third OFDM symbols in the SS / PBCH block occupy 12 RBs, and the second and fourth OFDM symbols occupy 24 RBs. In another interpretation, the SS / PBCH block occupies 24 RBs on the frequency axis and can be a rectangular shaped time-frequency resource occupying 4 OFDM symbols on the time axis.

Referring to FIG. 28, a slot configuration of a terminal operating on a slot basis is shown.

CORESET is a time-frequency domain in which a PDCCH, which is a control signal of a UE, is transmitted. A search space set for transmitting a PDCCH to a UE can be mapped into a CORESET. That is, the UE can receive only the time-frequency domain defined by CORESET and decode the PDCCH mapped therein without receiving the entire frequency band and attempting PDCCH decoding. Referring to FIG. 28, there can be only one CORESET in a cell. Accordingly, all the UEs connected to the corresponding cell can perform PDCCH decoding by receiving one CORESET configured to the UE. Multiple CORESETs can exist in a cell. When there are multiple CORESETs in a cell, each terminal can be configured to monitor one or more CORESET (s). The CORESET (s) allocated to a UE can be configured to overlap with each other over time-frequency resources. The UE can know the time-frequency domain occupied by the CORESET (s) configured in the UE itself from the Node B in the current slot. However, the area of the time-frequency occupied by the CORESET (s) not configured for the UE from the base station by the current slot may be unknown or may be known through additional signaling. Also, the UE can not know the time-frequency resource occupied by the PDCCH (s) dynamically allocated to the CORESET (s) configured to itself in the future slot (s) from the base station.

For convenience of description of the present invention, a PDCCH scrambled with a group common RNTI (or common control RNTI, CC-RNTI) already known by the UEs is referred to as a UE group common PDCCH or a common PDCCH for transmission to one or more UEs , And describes a PDCCH scrambled with a specific-UE RNTI that a specific UE already knows in order to transmit uplink scheduling information or downlink scheduling information to a specific UE, as a specific-UE PDCCH. RNTI, P-RNTI, RA-RNTI, and TPC-RNTI may be used as RNTIs used by one or more UEs in LTE (-A). There may be C-RNTI, SPS C-RNTI, etc. in the specific-terminal RNTI. Also, the resources that the UE performs blind decoding to find the UE group common PDCCH are called the group common search space, and the resources for which the UE performs the blind decoding to find the specific-terminal PDCCH are called the specific-terminal search space.

Referring to FIG. 28, when a slot is composed of 14 symbols, the UE transmits a front-loaded DMRS start position to an OFDM symbol number 2 or an OFDM symbol number 3 through a PBCH (Physical Broadcast Channel) . Referring to FIGS. 28 (a) and 28 (b), when the UE receives an OFDM symbol number 2 as a start position of a front-loaded DMRS, the UE monitors the PDCCH with an OFDM symbol number 0 and an OFDM symbol number 1 You can be instructed to CORESET for. The front-loaded DMRS of the UE can also be transmitted over one or two OFDM symbols. Referring to FIG. 28 (c) and FIG. 28 (d), when the UE receives an OFDM symbol number 3 as a start position of a front-loaded DMRS, the UE transmits an OFDM symbol number 0, an OFDM symbol number 1, May be indicated by a CORESET for monitoring the PDCCH. The front-loaded DMRS of the UE can also be transmitted over one or two OFDM symbols.

Referring to FIG. 29, it may be configured to transmit additional DMRS separately from the front-loaded DMRS. Additional DMRS may be transmitted on the OFDM symbol (s) after the front-loaded DMRS to make the Doppler available on the larger channel. The base station can configure the number of additional DMRS and the position of the transmitted symbol to UEs requiring additional DMRS by UE-specific RRC signals or to configure and dynamically indicate UE specific RRC signals. The UE having the additional DMRS configured can receive the front-loaded DMRS and additional DMRS and use it for channel estimation to obtain the correct channel estimation value. In the present invention, 1-symbol additional DMRS is used for convenience, but the present invention can be applied to additional DMRS composed of several symbols.

SS / PBCH block and (reserved) resources can not be used for downlink data transmission. Therefore, if the PDSCH allocated to the UE overlaps with the SS / PBCH block and the reserved resource, the PDSCH must be rate-matched and received and transmitted to the remaining time-frequency resources except for the SS / PBCH block and the reserved resource. However, if the DMRS for decoding the PDSCH can not be transmitted, the demodulation performance of the PDSCH may deteriorate. A problem to be solved by the present invention is a method for allocating a DMRS when resources allocated to the DMRS for data decoding overlap with resources allocated to SS / PBCH block or reservation.

Physical Random Access Channel (PRACH) resources and (reserved) resources can not be used for uplink data transmission. Accordingly, if the PUSCH allocated to the UE overlaps with the PRACH resource and the reserved resource, the PUSCH must be received and transmitted in a rate-matching manner to the remaining time-frequency resources except for the PRACH resource and the reserved resource. However, if the DMRS for decoding the PUSCH can not be transmitted, demodulation performance of the PUSCH may deteriorate. A problem to be solved by the present invention is a method of allocating a DMRS when resources allocated to a DMRS for data decoding overlap with resources allocated to a PRACH resource or a reservation.

A method for determining the location of a DMRS for downlink data transmission will be described for the purpose of explaining the present invention. As mentioned above, in principle, it is possible to locate the DMRS for uplink data transmission in the same way. A method of determining the DMRS position for downlink data transmission will be described below assuming the SS / PBCH block in FIG. 27 and the slot configuration in FIG. 28 (a). However, the present invention can be used on the same principle in other slot configurations than other SS / PBCH blocks and reserved resources.

Referring to FIG. 30, in an embodiment of the present invention, when a front-loaded DMRS of a UE overlaps an SS / PBCH block or a reserved resource, the BS may puncture the overlapped resource by puncturing the DMRS. The UE may perform channel estimation using the DMRS allocated to the non-punctured resources, and may use the PDSCH or the PUSCH for decoding. At this time, the PDSCH or PUSCH assigned to the punctured PRB of the DMRS can be decoded using the DMRS transmitted from the non-punctured PRB.

In an embodiment of the present invention, it may be assumed that a PDSCH or a PUSCH is not transmitted to a PRB where a DMRS is punctured. Therefore, the UE can receive and transmit the PDSCH or the PUSCH by rate-matching or puncturing by excluding the punctured PRB from the DMRS.

In an embodiment of the present invention, a terminal may consider signals transmitted in a punctured PRB as a DMRS. Referring to FIG. 30, if the transmission scheme used in the PDSCH of the UE determines that the SS / PBCH block transmission scheme is the same or is instructed by the BS, the PSS or SSS of the SS / PBCH transmitted from the OFDM symbol number 2, Can be used as a DMRS for demodulating the PDSCH. The BS and the UE can determine that the transmission scheme is the same through QCL (Quasi-Co-located) information between the PDSCH and the SS / PBCH block. The information on the QCL may be transmitted on a downlink control channel (DCI) of a PDCCH for scheduling a PDSCH.

In the description of the present invention, it is assumed that the PSS or SSS of the SS / PBCH transmitted in the OFDM symbol number 2 or the DMRS of the PBCH can not be used as the DMRS of the PDSCH. That is, the UE is instructed that the transmission scheme of the PDSCH is different from the transmission scheme of the SS / PBCH block, or the UE does not receive the related information.

31, when a front-loaded DMRS of a UE overlaps with an SS / PBCH block or a reserved resource, the BS punctures the DMRS to the overlapped resources and transmits the DMRS to the BS The front-loaded DMRS can be transmitted on the SS / PBCH block or the Kth OFDM symbol that does not overlap reserved resources. Referring to FIG. 31, preferably K = 7 or K = 8. Preferably, a front-loaded DMRS may be moved to an SS / PBCH block or an immediately following OFDM symbol of a reserved resource, and allocated and transmitted. When the front-loaded DMRS overlaps with the SS / PBCH block or the reserved resource, the UE does not receive the DMRS from the overlapping resource but receives the DMRS for the overlapped resource from the Kth symbol to perform channel estimation for demodulating the data channel. Can be used.

Referring to FIG. 32, when a front-loaded DMRS of a UE overlaps with an SS / PBCH block or a reserved resource, the BS transmits the corresponding front-loaded DMRS to the SS / PBCH block or reserved resource It can be transmitted with other OFDM symbols that do not overlap. At this time, the resource that is originally allocated to transmit the front-loaded DMRS can be used as PDSCH or PUSCH. Preferably, K = 7 or K = 8. Preferably, K may be the next OFDM symbol of the SS / PBCH block or the reserved resource. Preferably, the terminal having the additional DMRS in the Mth OFDM symbol can be defined as K = M. When a front-loaded DMRS overlaps with an SS / PBCH block or a reserved resource, the UE receives all front-loaded DMRSs from the K-th symbol without receiving all front-loaded DMRSs and estimates the channel for demodulation of the data channel Can be used for.

33, when the front-loaded DMRS of the UE overlaps with the SS / PBCH block or the reserved resource, the front-loaded DMRS is punctured and not transmitted, and the position of the M-th symbol Additional DMRS can be allocated additionally. Preferably, M may be the next OFDM symbol of the SS / PBCH block or reserved resource. Preferably, the M value for the symbol to which the additional DMRS is transmitted may be transmitted to the L1 signal so that the base station can select either the RRC signal or the L1 signal or the RRC configured to the terminal. When the front-loaded DMRS overlaps with the SS / PBCH block or the reserved resource, the UE does not receive the front-loaded DMRS from the overlapping resource but receives the additional DMRS from the Mth symbol to estimate the channel for demodulation of the data channel. Can be used.

Referring to FIG. 34, when a front-loaded DMRS of a UE overlaps an SS / PBCH block or a reserved resource, the BS punctures and transmits the DMRS to the overlapped resource, The front-loaded DMRS can be transmitted on the SS / PBCH block or the Kth OFDM symbol that does not overlap reserved resources. In addition, the Mth additional DMRS can be additionally allocated. Preferably, K = 7 or K = 8, regardless of the M value. Preferably, regardless of the value of M, K may be the next OFDM symbol of the SS / PBCH block or the reserved resource. Preferably, M may be the next OFDM symbol of the SS / PBCH block or reserved resource. Preferably, the M value for the symbol to which the additional DMRS is transmitted may be transmitted to the L1 signal so that the base station can select either the RRC signal or the L1 signal or the RRC configured to the terminal. When the front-loaded DMRS overlaps with the SS / PBCH block or the reserved resource, the UE does not receive the front-loaded DMRS from the overlapping resource but receives the front-loaded DMRS for the overlapping resource from the Kth symbol and demodulates the data channel The terminal can also receive additional DMRS in the Mth symbol and use it for channel estimation for demodulation of the data channel.

35, in an embodiment of the present invention, when a front-loaded DMRS of an additional DMRS configured to an Mth symbol overlaps with an SS / PBCH block or a reserved resource, a front-loaded DMRS allocated to the overlapping resource DMRS does not transmit by puncturing. The terminal obtains channel information on the PRB (s) to which the front-loaded DMRS is not transmitted through the additional DMRS. If both the front-loaded DMRS and the additional DMRS are overlapped with the SS / PBCH block or the reserved resource, the front-loaded DMRS and the additional DMRS allocated to the overlapping resource are not punctured and transmitted, -loaded DMRS can be transmitted on the Kth symbol. Preferably K = 7 or 8. Preferably, K may be the next OFDM symbol of the SS / PBCH block or the reserved resource. In other words, if at least one DMRS is assigned to each PRB, the terminal decodes the corresponding PRB using the DMRS, and if one DMRS is not allocated, the terminal can allocate the DMRS to the Kth OFDM symbol. When the front-loaded DMRS overlaps with the SS / PBCH block or the reserved resource, the UE does not receive the front-loaded DMRS from the overlapping resource but receives the front-loaded DMRS for the overlapping resource from the Kth symbol and demodulates the data channel The terminal can also receive additional DMRS in the SS / PBCH block or resources that do not overlap the reserved resource in the Mth symbol and use it for channel estimation for demodulation of the data channel.

Referring to FIG. 36, when the front-loaded DMRS of the UE having the additional DMRS in the Mth symbol overlaps with the SS / PBCH block or the reserved resource, the front-loaded DMRS allocated to the overlapping resource DMRS does not transmit by puncturing. The terminal obtains channel information on the PRB (s) to which the front-loaded DMRS is not transmitted through the additional DMRS. If both the front-loaded DMRS and the additional DMRS are overlapped with the SS / PBCH block or the reserved resource, the front-loaded DMRS and the additional DMRS allocated to the overlapping resource are not punctured and transmitted, -loaded DMRS can be transmitted on the Kth symbol. Preferably K = 7 or 8. Preferably, K may be the next OFDM symbol of the SS / PBCH block or the reserved resource. Also, the terminal can transmit the additional DMRS that can not be transmitted by puncturing in the Sth symbol. Preferably S = 13 or 14. Preferably, S may be an SS / PBCH block of symbols after the Mth symbol or an immediately following OFDM symbol of a reserved resource. When the front-loaded DMRS overlaps with the SS / PBCH block or the reserved resource, the UE does not receive the front-loaded DMRS from the overlapping resource but receives the front-loaded DMRS for the overlapping resource from the Kth symbol and demodulates the data channel The terminal may also receive additional DMRS in the SS / PBCH block or resources that do not overlap the reserved resource in the Mth symbol and may use it for channel estimation for demodulation of the data channel, The additional DMRS of the resource may be received at the S-th symbol and used for channel estimation for demodulation of the data channel.

In yet another embodiment of the present invention, the base station may indicate as an L1 signal to use an area overlapping an SS / PBCH block or a reserved resource. For example, when scheduling a PDSCH in an area overlapping the SS / PBCH block or a reserved resource in a downlink control signal (DCI) scheduling PDSCH of the UE, it is determined whether a DMRS is mapped to the corresponding area in the DCI, And an indicator indicating whether the data is mapped. Also, the information can be transmitted to a plurality of terminals through a group-common DCI transmitted in a slot in which the PDSCH is scheduled. The Group-common DCI refers to a DCI that a plurality of terminals monitor with the same RNTI. In another embodiment of the present invention, the UE can receive the PDSCH assuming that it can always be used even if there is an area overlapping the SS / PBCH block or the reserved resource without the help of the L1 signal.

A terminal may receive data from a plurality of transmission points (TPs), e.g., TP1 and TP2, and thus a terminal may transmit channel state information for the plurality of TPs. In this case, RSs may also be transmitted from the plurality of TPs to the terminal. In addition, data can be received using a plurality of beams at one transmission point, and thus the terminal can transmit channel state information for the plurality of beams. In this case, RSs may also be transmitted from the plurality of beams to the terminal. For channel estimation between these RS ports, the LTE-A system introduces the concept of QCL (Quasi Co-Located). For example, if a large-scale property of a wireless channel through which a symbol is transmitted through one antenna port can be inferred from a wireless channel through which the symbol is transmitted through another antenna port, It can be said that the antenna ports are QCL. Here, the wide-range characteristic includes at least one of a delay spread, a Doppler spread, a Doppler shift, an average gain, and an average delay.

According to the concept of the QCL, channel information obtained for antenna ports having the same QCL hypothesis can be shared with each other. According to the concept of the QCL, a UE can not assume the same wide-ranging characteristics for non-QCL antenna ports among wireless channels from corresponding antenna ports. That is, in this case, the UE must perform independent processing for each set non-QCL antenna port with respect to timing acquisition and tracking, frequency offset estimation and compensation, delay estimation, and Doppler estimation. In addition, channel estimation information between antenna ports assuming different QCLs can not be shared with each other.

In an exemplary embodiment of the present invention, when receiving a PDSCH, the UE is configured such that the PRB (s) included in the corresponding PDSCH does not include a front-loaded DMRS, does not include additional DMRS, - If it is configured or instructed not to include a reference (QCL) reference signal, it can be judged to be a PRB (s) that can not receive the PDSCH. Therefore, the PDSCH is received in the DL except for the PRB (s). When a UE receives a PDSCH, a PRB (s) included in the PDSCH is configured to include at least a front-loaded DMRS, configured to include additional DMRSs, or to include at least one reference signal that is QCLed with the DMRS If it is configured or instructed, the terminal can determine that it is a PRB (s) that can receive the PDSCH. If the front-loaded DMRS or the additional DMRS of the PDSCH can not be transmitted due to the resource setting of the SS / PBCH block or the reserved resource, it is considered to be configured not to be included.

In another embodiment of the present invention, a UE configured to receive only a front-loaded DMRS when receiving a PDSCH scheduling receives an SS / PBCH block or a reserved resource in a region where a front-loaded DMRS of a PDSCH is transmitted, The PDSCH can be received assuming that the PDSCH is not allocated to the PRB (s) that can not receive the PDSCH. The UE receives the DCI scheduling the PDSCH and knows the time-frequency resources to which the PDSCH can be mapped through the resource allocation information of the time-frequency resource included in the DCI. Also, the UE can know the time-frequency resource occupied by the SS / PBCH block or the reserved resource, which is instructed through the RRC signal or the L1 signaling. Accordingly, when the time-frequency domain occupied by the SS / PBCH block or the reserved resource overlaps among the time-frequency resources to which the front-loaded DMRS of the PDSCH can be mapped through the resource allocation information, the UE transmits a PRB (s ) Receives the PDSCH on the assumption that the PDSCH is not mapped. That is, PDSCH can be received assuming that the PDSCH is rate-matched in the remaining region except for the corresponding PRB (s). In the above process, when the base station scheduler determines the transport block size (TBS) from the modulation and coding scheme field of the DCI, a PRB (s) in which the SS / PBCH block or reserved resource is located and the terminal can not receive the DMRS is included The UE can exclude resources that can not be transmitted through the PDSCH when receiving the PDSCH. For reference, resource allocation according to presence / absence of PRB (s) in which PDSCH is not transmitted will be described later.

In FIG. 37, the PDSCH is allocated to PRB 5, PRB 6, and PRB 7 through DCI resource allocation information, and some resources are set as reserved resources in PRB 6. Therefore, since the front-loaded DMRS of the PRB 6 can not be transmitted due to the reserved resource, the UE can receive the PDSCH on the assumption that the PDSCH is not transmitted from the base station to the PRB 6. Therefore, it is assumed that the PDSCH is transmitted over PRB 5, PRB 6, and PRB 7 through resource allocation information of the DCI, but it is assumed that the PDSCH is transmitted only in the PRB 5 and PRB 7, and the UE can receive the PDSCH .

Alternatively, the UE may receive the RRC signal or the L1 signaling or know the time-frequency resource occupied by the predetermined SS / PBCH block or the reserved resource. Therefore, the UE transmits the PDSCH It is assumed that a PDSCH is transmitted from a base station to a portion excluding a time-frequency resource occupied by a predetermined SS / PBCH block or a reserved resource, that is, a time when a PDSCH occupies a predetermined SS / PBCH block or a reserved resource - PDSCH can be received assuming that it is rate-matched to the part excluding the frequency resource. Since the PRB (s) as a part of the time-frequency domain and a few number of symbols are reserved, some of the reserved values can be obtained by interpolating even though the DMRS is not allocated in the corresponding PRB (s) Resources can be prevented from wasting time-frequency resources. In the embodiment of FIG. 37, the PDSCH is allocated to PRB 5, PRB 6, and PRB 7 through DCI resource allocation information. Even if some resources are set as reserved resources in PRB 6, A time-frequency resource other than the resource can receive the PDSCH assuming that the PDSCH can be transmitted from the base station. Therefore, it is assumed that PDSCH is transmitted from the base station in some resources of PRB 5, PRB 7, and PRB 6 because the PDSCH instructs transmission of PDSCH over PRB 5, PRB 6, and PRB 7 through DCI resource allocation information. The UE can receive the PDSCH.

In another embodiment of the present invention, a UE configured to receive a front-loaded DMRS and an additional DMRS when receiving a PDSCH scheduling by a UE receives an SS / PBCH block or a reserved resource in an area of a front-loaded DMRS and an additional DMRS of a PDSCH It is assumed that the PDSCH is not allocated to the PRB (s) that does not receive both the front-loaded DMRS and the additional DMRS, and can receive the PDSCH. The UE receives the DCI scheduling the PDSCH and knows the time-frequency resources to which the PDSCH can be mapped through the resource allocation information of the time-frequency resource included in the DCI. Also, the UE can know the location of the symbol to which the additional DMRS is transmitted. Also, the UE can know the time-frequency resource occupied by the SS / PBCH block or the reserved resource, which is instructed through the RRC signal or the L1 signaling. Accordingly, when the time-frequency domain occupied by the SS / PBCH block or the reserved resource among the time-frequency resources to which the front-loaded DMRS and the additional DMRS of the PDSCH can be mapped through the resource allocation information is overlapped, Assume that PDSCH is not mapped to PRB (s) and PDSCH is received. That is, PDSCH can be received assuming that the PDSCH is rate-matched in the remaining region except for the corresponding PRB (s). Otherwise, if at least one DMRS (front-loaded DMRS or additional DMRS) is transmitted without overlapping, the terminal determines that the PDSCH can be transmitted from the base station to the PRB (s) and receives the PDSCH. In the above process, when the base station scheduler determines the transport block size (TBS) from the modulation and coding scheme field of the DCI, a PRB (s) in which the SS / PBCH block or reserved resource is located and the terminal can not receive the DMRS is included The UE can exclude resources that can not be transmitted through the PDSCH when receiving the PDSCH. For reference, resource allocation according to presence or absence of a PRB to which PDSCH is not transmitted will be described later.

In FIG. 38, PDSCH is allocated to PRB 5, PRB 6 and PRB 7 through DCI resource allocation information, and some resources are set as reserved resources in PRB 6. Here, the front-loaded DMRS of the PRB 6 can not be transmitted due to the reserved resource, but since the additional DMRS is transmitted, the UE can receive the PDSCH assuming that the PDSCH can be transmitted from the base station to the PRB 6. Therefore, PDSCH is transmitted over PRB 5, PRB 6, and PRB 7 through DCI resource allocation information. Therefore, PDSCH is assumed to be transmitted in PRB 5, PRB 6, and PRB 7, and the UE can receive the PDSCH.

In another embodiment of the present invention, a UE configured to receive only a front-loaded DMRS when receiving a PDSCH scheduling receives an SS / PBCH block or a reserved resource in a region where a front-loaded DMRS of a PDSCH is transmitted, it is possible to determine whether the PDSCH can be allocated to the PRB (s) according to the presence or absence of another reference signal transmitted in the same transmission scheme as the front-loaded DMRS in the PRB (s) that does not receive the loaded DMRS. Here, if the same QCL (quasi-co-located) is used between the front-loaded DMRS and the reference signal, it can be determined that the transmission method is the same. The UE receives the DCI scheduling the PDSCH and knows the time-frequency resources to which the PDSCH can be mapped through the resource allocation information of the time-frequency resource included in the DCI. Also, the UE can know the time-frequency resource occupied by the SS / PBCH block or the reserved resource specified by the RRC signal or the L1 signal. Also, the UE can determine whether the front-loaded DMRS and the SS / PBCH block of the PDSCH or the reference signal of the reserved resource are QCL through the TCI (transmission configuration information) information of the DCI or the RRC signal. Accordingly, when the time-frequency domain occupied by the SS / PBCH block or the reserved resource among the time-frequency resources to which the DMRS of the PDSCH can be mapped overlaps with the PRB (s) including the overlapped region through the resource allocation information, If the reference signal of the SS / PBCH block or the reserved resource exists, the UE determines that the PDSCH is mapped to the corresponding PRB, and the reference signal of the SS / PBCH block or the reserved resource QCL in the PRB (s) , The UE determines that the PDSCH is not mapped to the corresponding PRB (s). If it is determined that the PDSCH is not mapped to the corresponding PRB (s), the UE can receive the PDSCH based on the assumption that the PDSCH is rate-matched in the remaining regions except for the corresponding PRB (s). Also, when the base station scheduler determines a transport block size (TBS) from the Modulation and coding scheme field of the DCI, the terminal may exclude resources for which the PDSCH is not transmitted when receiving the PDSCH. For reference, resource allocation according to presence or absence of a PRB to which PDSCH is not transmitted will be described later.

In FIG. 39, the PDSCH is allocated to PRB 5, PRB 6, and PRB 7 through DCI resource allocation information, and some resources are set as reserved resources in PRB 6. In this case, the front-loaded DMRS of PRB 6 can not be transmitted due to the reserved resource, but since the reserved resource of the PRB 6 is QCL with the front-loaded DMRS, the terminal can transmit the PDSCH from the base station to the PRB 6 And receive the PDSCH. However, it is assumed that the PDSCH can not be transmitted because the front-loaded DMRS of the PRB 5 can not be transmitted due to the reserved resource, the reserved resource of the PRB 5 is not front-loaded DMRS and QCL, can do. Therefore, it is assumed that PDSCH is transmitted over PRB 5, PRB 6, and PRB 7 through resource allocation information of DCI, but PDSCH is transmitted from PRB 6 and PRB 7.

Alternatively, as another embodiment, the UE can acquire information related to the QCL and the time-frequency resources occupied by the SS / PBCH block or the reserved resource, which are instructed through the RRC signal or L1 signaling, it is assumed that a PDSCH is received from a base station in a portion excluding a time-frequency resource occupied by a predetermined SS / PBCH block or a reserved resource, i.e., a UE receives a PDSCH through allocation information, the PDSCH can be received assuming that it is rate-matched to the portion excluding the time-frequency resource occupied by the reserved resource. For example, in FIG. 39, the PDSCH is allocated to PRB 5, PRB 6, and PRB 7 through DCI resource allocation information, and some resources are set as reserved resources in PRB 6. In this case, the front-loaded DMRS of PRB 6 can not be transmitted due to the reserved resource, but since the reserved resource of the PRB 6 is QCL with the front-loaded DMRS, the terminal can transmit the PDSCH from the base station to the PRB 6 And receive the PDSCH. Even if the front-loaded DMRS of the PRB 5 can not be transmitted due to the reserved resource and the PDSCH can not be transmitted because the reserved resource of the PRB 5 is not QCLed with the front-loaded DMRS, the QCLs PRB 6 and PRB 7 (S) and a few number of symbols as a part of the time-frequency domain, the time-frequency resources are wasted due to some reserved resources , It is assumed that the PDSCH can be transmitted in an area other than the reserved resource of the PRB 5, and the UE can receive the PDSCH. Therefore, it is assumed that PDSCH is transmitted over PRB 5, PRB 6, and PRB 7 through resource allocation information of DCI, but it is assumed that PDSCH is transmitted from some resources of PRB 6, PRB 7 and PRB 5, .

In another embodiment of the present invention, a UE configured to receive a front-loaded DMRS and an additional DMRS when receiving a PDSCH scheduling by a UE receives an SS / PBCH block or reserved resource is located and the PDSCH can be allocated to the PRB (s) according to the presence or absence of another reference signal transmitted in the same transmission scheme as the DMRS in the PRB (s) that does not receive the front-loaded DMRS and the additional DMRS It can be judged. Here, if the same QCL (quasi-co-located) between the front-loaded DMRS or the additional DMRS and the reference signal is used, it can be determined that the same transmission method is used. The UE receives the DCI scheduling the PDSCH and knows the time-frequency resources to which the PDSCH can be mapped through the resource allocation information of the time-frequency resource included in the DCI. Also, the UE can know the time-frequency resource occupied by the SS / PBCH block or the reserved resource, which is instructed through the RRC signal or the L1 signaling. In addition, the UE can determine whether the DMRS and the SS / PBCH block of the PDSCH or the reference signal of the reserved resource are QCL through the TCI (transmission configuration information) information of the DCI or the RRC signal. Accordingly, when the time-frequency domain occupied by the SS / PBCH block or the reserved resource among the time-frequency resources to which the DMRS of the PDSCH can be mapped overlaps with the PRB (s) including the overlapped region through the resource allocation information, If the reference signal exists in the SS / PBCH block or the reserved resource region, the UE determines that the PDSCH is mapped to the corresponding PRB (s), and the SS / PBCH block or reserved resource region , The UE determines that the PDSCH is not mapped to the corresponding PRB (s). If it is determined that the PDSCH is not mapped to the corresponding PRB (s), the UE can receive the PDSCH based on the assumption that the PDSCH is rate-matched in the remaining regions except for the corresponding PRB (s). Also, when the base station scheduler determines a transport block size (TBS) from the Modulation and coding scheme field of the DCI, the terminal may exclude resources for which the PDSCH is not transmitted when receiving the PDSCH. For reference, resource allocation according to presence / absence of PRB (s) in which PDSCH is not transmitted will be described later.

In an exemplary embodiment of the present invention, when transmitting a PUSCH, the UE is configured such that the PRB (s) included in the corresponding PUSCH does not include a front-loaded DMRS and does not include additional DMRS, If it is configured or instructed not to include a reference (QCL) signal, it can be judged to be a PRB (s) that can not transmit a PUSCH. Therefore, the PRB (s) is allocated and the PUSCH is allocated. When transmitting a PUSCH, the UE may be configured such that the PRB (s) included in the PUSCH is configured to include at least a front-loaded DMRS, configured to include additional DMRSs, or include at least one reference signal that is QCLed with the DMRS If received or configured, the terminal may determine that it is a PRB (s) capable of PUSCH transmission. For reference, if the front-loaded DMRS or the additional DMRS of the PUSCH can not be transmitted due to a resource setting such as a PRACH block or a reserved resource, it is regarded as being configured not to be included.

In another embodiment of the present invention, a UE configured to transmit only a front-loaded DMRS when receiving a PUSCH scheduling may transmit a PRACH transmission resource (or a block) or a reserved resource in an area where a front-loaded DMRS of a PUSCH is transmitted , It can be assumed that the PUSCH is not allocated to the PRB (s) that can not transmit the front-loaded DMRS, and the PUSCH can be transmitted. The UE receives the DCI for scheduling the PUSCH and knows the time-frequency resource to which the PUSCH can be mapped through the resource allocation information of the time-frequency resource included in the DCI. Also, the UE can know the time-frequency resource occupied by the PRACH transmission resource (or block) or the reserved resource, which is indicated through the RRC signal or L1 signaling. Therefore, when the time-frequency domain occupied by the PRACH transmission resource (or block) or the reserved resource among the time-frequency resources to which the front-loaded DMRS of the PUSCH can be mapped overlaps with the resource allocation information, It is assumed that the PUSCH is not mapped to the PRB (s), and the PUSCH is transmitted. That is, the PUSCH can be transmitted assuming that the PUSCH is rate-matched in the remaining regions except for the corresponding PRB (s). In the above procedure, when the BS scheduler determines the transport block size (TBS) from the modulation and coding scheme field of the DCI, the PRACH transmission resource (or block) or reserved resource is located and the PRB s) is included, the UE can transmit the PUSCH by excluding the resources that can not transmit the PUSCH. The above procedure can be used when the UE transmits the PUSCH in the CP-OFDM transmission scheme. When the UE transmits the PUSCH in the DFT-s-OFDM transmission scheme, the UE always assumes that the PUSCH is continuous in the frequency domain. Therefore, it can be assumed that the UE does not occasionally overlap the scheduled PUSCH with a reserved resource or a PRACH transmission resource (or block) in a certain frequency region. In case of overlapping, it is possible not to perform the scheduled PUSCH transmission or to transmit the PUSCH using only some time-frequency resources. At this time, some time-frequency resources to which the PUSCH is transmitted must always be continuous in the frequency domain. In one embodiment, the UE selects some time-frequency resources occupying the largest number of PRBs (or Resource element (s), RE (s)) in the frequency domain among the time-frequency resources allocated with the PUSCH The PUSCH can be transmitted to the corresponding resource. For reference, resource allocation according to presence or absence of a PRB to which PDSCH is not transmitted will be described later. Also, the above procedure can be used in the case of transmitting the PUSCH in consideration of discontinuous resource allocation in the DFT-s-OFDM similarly to the CP-OFDM.

In another embodiment of the present invention, a UE configured to transmit only front-loaded DMRS when receiving a PUSCH scheduling, a PRACH transmission resource (or block) or a reserved resource is located in a region where the DMRS of the PUSCH is transmitted, it is possible to determine whether or not a PUSCH can be allocated to the PRB (s) according to the presence or absence of another reference signal transmitted in the same transmission scheme as the front-loaded DMRS in the PRB (s) that can not transmit the loaded DMRS. Here, it can be judged that the same transmission method is used for the same QCL (quasi-co-located) between the front-loaded DMRS and the reference signal. The UE receives the DCI for scheduling the PUSCH and knows the time-frequency resource to which the PUSCH can be mapped through the resource allocation information of the time-frequency resource included in the DCI. Also, the UE can know the time-frequency resource occupied by the PRACH transmission resource (or block) or the reserved resource, which is indicated through the RRC signal or L1 signaling. In addition, the UE can determine whether a front-loaded DMRS and a PRACH transmission resource (or block) of the PUSCH or a reference signal of a reserved resource are QCL through TCI (transmission configuration information) information of the DCI or RRC signal. Therefore, when the time-frequency domain occupied by the PRACH transmission resource (or block) or the reserved resource among the time-frequency resources to which the front-loaded DMRS of the PUSCH can be mapped overlaps with the resource allocation information, If the PRACH transmission resource (or block) or the reference signal of the reserved resource exist in the PRB, the UE determines that the PUSCH can be mapped to the corresponding PRB, and transmits the PRACH transmission resource (or block) QCL to the PRB including the overlapping region. Or if there is no reference signal of the reserved resource, the terminal determines that the PUSCH can not be mapped to the corresponding PRB. If it is determined that the PUSCH is not mapped to the corresponding PRB, the terminal can transmit the PUSCH on the assumption that the PUSCH is rate-matched in the remaining regions except for the corresponding PRB. In addition, when the BS scheduler determines a transport block size (TBS) from a modulation and coding scheme (MCS) field of the DCI, the MS may transmit a PUSCH by excluding resources that can not transmit the PUSCH. The above procedure can be used when the UE transmits the PUSCH in the CP-OFDM transmission scheme. When the UE transmits the PUSCH in the DFT-s-OFDM transmission scheme, the UE always assumes that the PUSCH is continuous in the frequency domain. Therefore, it can be assumed that the UE does not occasionally overlap the scheduled PUSCH with a reserved resource or a PRACH transmission resource (or block) in a certain frequency region. In case of overlapping, it is possible not to perform the scheduled PUSCH transmission or to transmit the PUSCH using only some time-frequency resources. At this time, some time-frequency resources to which the PUSCH is transmitted must always be continuous in the frequency domain. In one embodiment, the UE selects some time-frequency resources occupying the largest number of PRBs (or Resource element (s), RE (s)) in the frequency domain among the time-frequency resources allocated with the PUSCH The PUSCH can be transmitted to the corresponding resource. For reference, resource allocation according to presence / absence of a PRB to which a PUSCH is not transmitted will be described later. Also, the above procedure can be used in the case of transmitting the PUSCH in consideration of discontinuous resource allocation in the DFT-s-OFDM similarly to the CP-OFDM.

In another embodiment of the present invention, a UE configured to transmit a front-loaded DMRS and an additional DMRS when receiving a PUSCH scheduling of a UE places a PRACH transmission resource (or block) or a reserved resource in an area where the DMRS of the PUSCH is transmitted it is possible to determine whether a PUSCH can be allocated to the PRB (s) according to the presence or absence of another reference signal transmitted in the same transmission scheme as the DMRS in the PRB (s) that can not transmit the front-loaded DMRS and the additional DMRS . Here, if the same QCL (quasi-co-located) is used between the DMRS and the reference signal, the same transmission scheme can be determined. The UE receives the DCI for scheduling the PUSCH and knows the time-frequency resource to which the PUSCH can be mapped through the resource allocation information of the time-frequency resource included in the DCI. Also, the UE can know the time-frequency resource occupied by the PRACH transmission resource (or block) or the reserved resource, which is indicated through the RRC signal or L1 signaling. In addition, the UE can determine whether a front-loaded DMRS and a PRACH transmission resource (or block) of the PUSCH or a reference signal of a reserved resource are QCL through TCI (transmission configuration information) information of the DCI or RRC signal. Therefore, when the time-frequency domain occupied by the PRACH transmission resource (or block) or the reserved resource among the time-frequency resources to which the DMRS of the PUSCH can be mapped overlaps with the PRB including the overlap region through the resource allocation information, The UE determines that the PUSCH can be mapped to the corresponding PRB (s), and transmits the PRACH transmission resource (or block) QCL to the PRB including the overlapping region, if the PRACH transmission resource (or block) Or if there is no reference signal of the reserved resource, the UE determines that the PUSCH can not be mapped to the corresponding PRB (s). If it is determined that the PUSCH is not mapped to the corresponding PRB (s), the terminal can transmit the PUSCH on the assumption that the PUSCH is rate-matched in the remaining regions excluding the PRB. In addition, when the BS scheduler determines a transport block size (TBS) from a modulation and coding scheme (MCS) field of the DCI, the MS may transmit a PUSCH by excluding resources that can not transmit the PUSCH. The above procedure can be used when the UE transmits the PUSCH in the CP-OFDM transmission scheme. When the UE transmits the PUSCH in the DFT-s-OFDM transmission scheme, the UE always assumes that the PUSCH is continuous in the frequency domain. Therefore, it can be assumed that the UE does not occasionally overlap the scheduled PUSCH with a reserved resource or a PRACH transmission resource (or block) in a certain frequency region. In case of overlapping, it is possible not to perform the scheduled PUSCH transmission or to transmit the PUSCH using only some time-frequency resources. At this time, some time-frequency resources to which the PUSCH is transmitted must always be continuous in the frequency domain. In one embodiment, the UE selects some time-frequency resources occupying the largest number of PRBs (or Resource element (s), RE (s)) in the frequency domain among the time-frequency resources allocated with the PUSCH The PUSCH can be transmitted to the corresponding resource. For reference, resource allocation according to presence / absence of a PRB to which a PUSCH is not transmitted will be described later. Also, the above procedure can be used in the case of transmitting the PUSCH in consideration of discontinuous resource allocation in the DFT-s-OFDM similarly to the CP-OFDM.

The mobile station can be configured with an active DL bandwidth part (BWP), which is a frequency domain for receiving the PDSCH by the RRC signal, and an active UL bandwidth part (BWP), which is a frequency domain for transmitting the PUSCH.

When assigning the PDSCH and the PUSCH in the downlink control information (DCI), it is possible to instruct allocated PRBs (s) using RIV (resource indication value). RIV indicates the start index and length of the VRB (virtual RB) occupied by the PDSCH or PUSCH, and the 1-bit VRB-to-PRB indicates the mapping between the VRB and the PRB to know the position of the PRS occupied by the PDSCH or PUSCH. If the 1-bit VRB-to-PRB indicates 'localized', the index of the VRB is directly mapped to the PRB index. That is, VRB_i = PRB_j. Therefore, if the 1-bit VRB-to-PRB is 'localized', the PDSCH or PUSCH is continuous in the frequency domain. Conversely, if the 1-bit VRB-to-PRB indicates 'distributed', the index of the VRB is distributed through the interleaver and mapped to the PRB index. That is, VRB_i = PRB_f (j). Here, f (j) is a VRB-to-PRB interleaver function. Therefore, if the 1-bit VRB-to-PRB indicates 'distributed', the PDSCH or PUSCH is spread in the frequency domain. If the 1-bit VRB-to-PRB indicates 'distributed', a diversity gain in the frequency domain can be obtained. In order to obtain additional diversity gain, the PDSCH or PUSCH may be divided into two in the time domain, the first PDSCH or PUSCH divided may be allocated to the first PRBs, and the divided second PDSCH or PUSCH may be allocated to the second PRBs. Here, preferably, the first PRBs are PRBs obtained through VRB-to-PRB mapping, and the second PRBs are PRBs obtained by moving the first PRBs to a specific offset. If the index of the first PRBs is represented by a_1, a_2, ..., a_K, the index of the second PRBs is b_1 = a_1 + offset mod Z, b_2 = a_2 + offset mod Z, ..., b_K = a_K + offset mod Z. < / RTI > Here, Z = N _RB can be set. And Z is the number of RBs in the PDSCH or PUSCH allocatable area. That is, the number of RBs included in the active downlink bandwidth part or the active uplink bandwidth part. The offset value may be configured as an RRC signal or may be determined according to Z. [ For example, offset = floor (Z / 2) or offset = ceil (Z / 2). Where floor (x) returns the largest integer less than or equal to x, and ceil (x) returns the smallest integer number greater than or equal to x. Alternatively, the offset can be set to the number closest to Z / 2 of a multiple of P ^ 2. Here, P may be the size of a resource block group (RBG) indicated by the BS to the UE for each BWP. The number of columns is A, the number of rows is ceil (N_RB / A / P) * P, and the indexes of VRBs are arranged in order. When you read from and write to the row, you can read from the column sequentially. Where A = 4. The value of A may be configured by the RRC for each BWP from the base station. Also, the value of A may be determined according to N_RB, which is the number of PRBs included in the BWP. For example, A = B * ceil (N_RB / N_ref). Where N_ref is the number of PRBs to be a reference. Preferably B = 4. Preferably, N_ref for the PDSCH can be determined by the number of PRBs included in the initial active DL bandwidth, and N_ref for the PUSCH can be determined by the number of PRBs included in the initial active UL bandwidth.

Referring to FIG. 40, in a method in which a UE interprets scheduling information for a PDSCH in a DCI, a UE can assume PRBs in which PDSCHs are not transmitted, It is possible to exclude the unusable PRBs after analyzing the scheduling information for the PDSCH. More specifically, the terminal interprets the RIV value transmitted in the DCI in the same manner regardless of the number and location of the PRBs to which the PDSCH is not transmitted, and obtains the scheduling information for the PDSCH. Thereafter, if the PDSCH can not be transmitted to some of the PRBs of the region where the PDSCH obtained from the scheduling information can be allocated, the UE excludes the PRBs from the PDSCH. The UE receives the PDSCH according to the finally obtained PDSCH scheduling information. Here, the number of VRBs is the same as the number of PRBs and the mapping between VRBs and PRBs can use the VRB-to-PRB mapping described above. Fig. 40 shows the above embodiment. The terminal interprets the RIV assuming N_RB = 10. The analyzed RIV indicates VRB1, VRB2, and VRB3, and the VRBs are mapped to PRB1, PRB4, and PRB7. Also, assuming that the UE knows that PRB3, PRB4, and PRB5 are PRBs that can not be used for the PDSCH, the UE transmits a PDSCH to PRB1 and PRB7, which are PRBs other than the unused PRB4 among the scheduled PRB1, PRB4, and PRB7 The UE can receive the PDSCH.

Referring to FIG. 41, in a method in which a UE interprets scheduling information for a PDSCH in a DCI, a UE may assume PRBs in which a PDSCH is not transmitted, and PRBs The scheduling information for the PDSCH can be analyzed. Here, the number of VRBs is different from the number of PRBs of an active DL BWP, and the number of VRBs is equal to the number of available PRBs. Let UE be the number of RBs that can be used for PDSCH reception among the active DL BWPs, N'_RB, and let the PRB index of the RBs be {i ₁ , i ₂ , ..., i_ _{N'_RB} } in ascending order. The UE can obtain PDSCH scheduling information using N'_RB instead of the value of N_RB. First, the UE can generate N'_RB VRBs. The UE can obtain the vPRB index by interleaving the VRB index through VRB-to-vPRB mapping. This process may be the same as the VRB-to-PRB mapping described above. Here, the PRB index obtained by the UE is a value between 0 and N'_RB-1. The UE can map the obtained vPRB index to the PRB index. At this time, the mapping can be mapped to the PRB index _k , which is the k-th smallest usable PRB index, in the ascending order and the k-th smallest vPRB index. The UE can receive the PDSCH at the finally obtained PRB index. For reference, if additional frequency diversity is obtained, the first vPRB index is equal to the obtained vPRB index, and the second vPRB index is obtained by adding offset to the first vPRB index. The first vPRB index and the second vPRB index can be mapped to the PRB index in the same manner as described above. Preferably, when the UE analyzes the RIV-based scheduling information, the VRB-to-vPRB interleaver and the offset value are set to a value obtained by assuming that the UE can always use N_RB regardless of the number of PRBs to which the PDSCH is not transmitted from the base station. Lt; / RTI > As another example, when the UE analyzes the RIV-based scheduling information, the number of rows and offset of the VRB-to-vPRB interleaver may use different values depending on the number of PRBs in which the UE does not transmit the PDSCH. That is, the number of rows and the offset value of the VRB-to-vPRB interleaver can be obtained by using Z = N'_RB instead of Z = N_RB. Fig. 41 shows the above embodiment. The terminal interprets the RIV using N_RB = 7, assuming that N_RB = 10, but the terminal knows that PRB4, PRB5, and PRB6 are PRBs that can not be used for PDSCH. The analyzed RIV indicates VRB1, VRB2, and VRB3, and the VRBs are mapped to vPRB0, vPRB3, and vPRB6. Since the UE knows that PRB3, PRB4, and PRB5 are PRBs that can not be used for the PDSCH, PRB0, PRB6, and PRB9 can be known as the PRBs to be finally used.

Referring to FIG. 40, in a method in which a UE interprets scheduling information on a PUSCH in a DCI, a UE can assume PRBs to which a PUSCH is not transmitted, It is possible to exclude the unusable PRBs after analyzing the scheduling information for the PUSCH. More specifically, the terminal analyzes the RIV value transmitted from the DCI in the same manner regardless of the number and location of the PRBs to which the PUSCH is not transmitted, and obtains the scheduling information for the PUSCH. Thereafter, if the PUSCH can not be transmitted to some of the PRBs of the region where the PUSCH obtained from the scheduling information can be allocated, the UE removes the PRBs from the PDSCH. The UE transmits the PUSCH according to the finally obtained PUSCH scheduling information.

Referring to FIG. 41, in a method in which a UE interprets scheduling information on a PUSCH in a DCI, a UE may assume PRBs in which a PUSCH is not transmitted, and PRBs Can be used to interpret the scheduling information for the PUSCH. That is, the UE Let that number of RB N'_RB which can be used as the PUSCH transmission of the active UL BWP and the PRB index of the RB in ascending _{{i 1, i 2, ...} , i_ N'_RB}. The UE can obtain the PUSCH scheduling information using N'_RB instead of the value of N_RB. First, the UE can generate N'_RB VRBs. The UE can obtain the vPRB index by interleaving the VRB index through VRB-to-vPRB mapping. This process may be the same as the VRB-to-PRB mapping described above. Here, the PRB index obtained by the UE is a value between 0 and N'_RB-1. The UE can map the obtained vPRB index to the PRB index. At this time, the mapping can be mapped to the PRB index _k , which is the k-th smallest usable PRB index, in the ascending order and the k-th smallest vPRB index. The terminal can transmit the PUSCH at the finally obtained PRB index. For reference, if additional frequency diversity is obtained, the first vPRB index is equal to the obtained vPRB index, and the second vPRB index is obtained by adding offset to the first vPRB index. The first vPRB index and the second vPRB index can be mapped to the PRB index in the same manner as described above. Preferably, when the UE analyzes the RIV-based scheduling information, the VRB-to-vPRB interleaver and the offset value are set to a value obtained by assuming that the N_RB can always be used regardless of the number of PRBs to which the PUSCH is not transmitted Can be the same. As another example, when the UE analyzes the RIV-based scheduling information, the number of rows and offset of the VRB-to-vPRB interleaver may use different values depending on the number of PRBs to which the UE does not transmit the PUSCH. That is, the number of rows and the offset value of the VRB-to-vPRB interleaver can be obtained by using Z = N'_RB instead of Z = N_RB.

While the methods and systems of the present invention have been described in connection with specific embodiments, some or all of those elements or operations may be implemented using a computer system having a general purpose hardware architecture.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

Claims (1)

Method and apparatus for transmitting and receiving data between a terminal and a base station

Images