KR20190017581A - Method, apparatus, and system for transmitting control channel(s)/signal(s) in wireless system - Google Patents

Abstract

The present invention provides a method, an apparatus and a system to effectively multiplex control, signal and data channels, capable of effectively transmitting uplink control and data channels in a wireless communication system. According to the present invention, when a physical uplink control channel (PUCCH) is set to be transmitted onto a physical uplink signal channel (PUSCH) resource, puncturing is performed on a PUCCH resource element (RE) on the PUSCH resource for a PUCCH to transmit at least one hybrid-automatic repeat and request (HARQ)-ACK, and rate-matching is performed on a PUCCH to transmit a channel quality indicator (CQI), a rank indicator (RI), a precoding matrix indicator (PMI), and beam related information.

Description

TECHNICAL FIELD [0001] The present invention relates to a method, apparatus, and system for transmitting uplink control channels and signals in a wireless communication system,

The present invention relates to a method for simultaneous transmission and multiplexing of a scheduling request (SR) and an HARQ-ACK transmitted in an uplink control channel in a wireless communication, a resource selection of a control channel, and a method for transmission of an uplink control channel, Terminal apparatus and 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 new frame structure communication system with shorter m (eg, 0.2ms).

In addition, the 5G system offers a variety of requirements such as low latency, high capacity, low energy consumption, low cost, and high user data rate. The applications are expected to coexist together. As such, 5G needs to evolve into a system different from the conventional one to support various types of applications from applications requiring Ultra Low Latency to applications requiring high data transmission. In order to minimize the data reception delay of the terminal, a new frame structure different from the conventional one needs to be defined, and the influence of the legacy terminal due to the new frame structure should be minimized. 5G communication has evolved into a system for providing various kinds of applications ranging from applications requiring low latency to applications requiring high data rates.

5G aims to provide a data delay that is about 10 times lower than the conventional one. In order to solve such a problem, a 5G communication system requires a new frame structure having a shorter TTI than the conventional one. However, there has been no proposal for a frame structure in a 5G communication system that can still provide a reduced data delay.

Also, conventionally, there has been no proposal for multiplexing and transmitting data for different services on the same time and frequency resources in order to reduce data delay.

It is an object of the present invention to provide a method, apparatus and system for efficiently transmitting an uplink control channel and a data channel in a wireless communication system. The present invention also provides a method, apparatus, and system for multiplexing an uplink control channel and a data channel.

According to an embodiment of the present invention, an object of the present invention is to provide a method, apparatus and system for efficiently transmitting an uplink control channel and a data channel in a wireless communication system.

According to the embodiment of the present invention, the uplink control channel and the data channel can be efficiently transmitted in the wireless communication system, and the uplink control channel and the data channel can be efficiently multiplexed.

The present invention is applicable to various communication devices such as a terminal using a cellular communication and a station or a base station.

FIG. 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.
FIG. 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 configurations of a terminal and a base station according to an embodiment of the present invention.
13 is a diagram of a control region of a PDCCH for control channel transmission in LTE (-A).
FIG. 14- (a) is a diagram of a procedure for transmitting control information in LTE (-A).
FIG. 14- (b) is a diagram for CCE aggregation of PDCCH and multiplexing of PDCCH in LTE (-A).
FIG. 15 is a diagram showing a search space allocation by CCE aggregation for a common search space in the LTE (-A) and a UE specific (or terminal specific) search space.
16 is a diagram illustrating a PUSCH RE mapping method when transmission of control information in an LTE (-A) system is piggybacked to a PUSCH.
FIGS. 17A and 17B are diagrams illustrating a method of moving a PUCCH frequency resource to a frequency resource near a PUSCH in order to perform simultaneous transmission of a PUCCH and a PUSCH according to an embodiment of the present invention.
18- (a) and 18 (b) illustrate a method of performing frequency hopping for a PUCCH resource according to another embodiment of the present invention, but allocating all PUCCHs to a frequency resource adjacent to the PUSCH so as not to waste resources Fig.
FIG. 19 is a diagram illustrating a method of setting not to perform frequency hopping in a PUCCH transmission when a PUCCH and a PUSCH are simultaneously transmitted, according to another embodiment of the present invention.
20 is a diagram illustrating a method for handling a PUSCH DMRS collision in a case where a PUCCH moves to a PUSCH frequency resource according to an embodiment of the present invention.
21 is a diagram of a sequence based short PUCCH structure.
22 is a diagram of an FDM based short PUCCH structure.

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. Hereinafter, a cell operating on a primary frequency will be referred to as a primary cell (PCell) or a PCC, and a cell operating on a secondary frequency (or SCC) will be referred to as a secondary cell Cell, SCell) or SCC. 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). 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 BS may transmit control information for downlink scheduling, control information for uplink scheduling, control information for performing terminal transmission power control, random access response, downlink control such as paging information, Information can be transmitted through a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (EPDCCH). The base station can send DCIs of a plurality of terminals through the PDCCH / EPDCCH. In this case, it is necessary to determine whether the terminal is its own DCI. For this purpose, the CRC (Cyclic Redundancy Check) of the DCI is scrambled with a Radio Network Temporary Identifier (RNTI) specific to the UE. In addition, as described above, DCI formats of various lengths may exist in order to transmit various control information. According to 3GPP LTE (-A), DCI formats 0, 0A, 0B, 1, 1A, 1C, 1D, 2, 2A, 2B, 2C, 3, 3A, 4, 4A and 4B are defined. The UE performs decoding on all possible DCI formats that can be set according to a transmission mode and a transmission scheme in order to determine which DCI format is transmitted according to a transmission mode and a transmission scheme set from the base station, . ≪ / RTI > This process is called blind decoding and will be described later.

FIG. 13 shows a control region in which a PDCCH is transmitted in an LTE (-A) system. The control resign may be composed of 1 to 3 OFDM symbols (s) and may extend to 4 OFDM symbols when the system BW is 1.4 MHz. The PDCCH of the control region can be transmitted over 1 to 3 OFDM symbols (s) according to the size of the control region. And the PDCCH may be transmitted over the frequency axis or time axis within the control region.

Fig. 14- (a) relates to a procedure for control information and control channel transmission in LTE (-A). Each control information is subjected to rate matching according to the amount of resources (s) used for PDCCH transmission after attaching CRC according to the RNTI value according to the purpose and tailed biting convolutional coding. The PDCCHs (s) to be transmitted in a given subframe are multiplexed with PDCCHs using the CCE-based PDCCH structure to map resources to be transmitted. The number of CCEs used for one PDCCH is defined as the aggregation level. In LTE (-A), 1, 2, 4, and 8 can be used. FIG. 14- (b) is a diagram of CCE aggregation and multiplexing of a PDCCH, and shows a type of a CCE aggregation level used for one PDCCH and a CCE (s) transmitted in the corresponding control region.

15 is a diagram for setting up a PDCCH search space in the LTE (-A) system.

In order to transmit the PDCCH to the UE, at least one search space per UE may exist in the control region. In the present invention, the search space refers to all the time-space resource combinations to which the PDCCH of the UE can be transmitted, and includes a common search space common to all terminals of 3GPP LTE (-A) Specific or UE-specific search space to which a specific UE must search. The common search space is set to monitor a PDCCH that is set so that all terminals in a cell belonging to the same base station are commonly found. A specific terminal search space is defined as a PDCCH allocated to each terminal in search space positions However, the search space between the UEs may be partially overlapped due to the limited control region to which the PDCCH can be allocated.

In 3GPP LTE (-A) or NR, the network may transmit system information (SI) to terminals. The system information may be information necessary for the UE to reselect the information or cell necessary for cell access, and may include broadcast information that needs to be transmitted to the UE (s). The system information may be the same or different for each carrier of each base station. Such system information can be transmitted to RRC_IDLE terminals and RRC_CONNECTED terminals.

In 3GPP LTE (-A), system information can be divided into two types depending on a channel to be transmitted. The first is transmitted through a BCH (Broadcast Channel) as a MIB (Master Information Block) which is a limited amount of system information. The second is transmitted as a system information block (SIB) through a DL-SCH (Downlink Shared Channel). Here, the SIB may be composed of several different ones (SIB1, SIB2, ..., SIBx). The system information transmitted by each SIB will be described later.

The MIB transmitted using the BCH is composed of a very limited amount of system information, and this information is indispensable information for receiving the remaining system information provided using the DL-SCH. Information included in the MIB is information (4 bits) of the downlink cell bandwidth, information (3 bits) of the PHICH setting of the cell, and information (8 bits) of the SFN (System Frame Number). That is, the MIB includes only the most essential limited information of the system information, and the main part of the system information is included in other system information blocks (SIBs) and transmitted through the DL-SCH. The UE determines whether the DL-SCH is transmitted from the BS through detection of a PDCCH scrambled with a System information RNTI (SI-RNTI), and determines whether the PDCCH is transmitted or not based on the PDCCH scrambled by the SI- The UE receives the system information through the PDSCH as a DL-SCH, i.e., a physical channel, which is indicated through transmission of the PDSCH.

One BCH transport block corresponding to the MIB is transmitted once every 40 ms. That is, the TTI (Transmit Time Interval) of the BCH is 40 ms. Referring to FIG. 16, the MIB has a 16-bit CRC (Cyclic Redundancy Check) attached thereto, and is subjected to coding and rate matching and bit-wise scrambling in a 1/3 code tail-biting convolutional code, followed by QPSK modulation, Time-frequency resource. The antenna mapping used is Space-Frequency Block Code (SFBC) when two antenna ports are used, and SFBC / Frequency Switched Transmit Diversity (FSTD) when four antenna ports are used. If the UE finds out the transmit diversity scheme used for the BCH through blind detection without explicit signaling, it can indirectly know the number of antenna ports used in the cell.

16 is a diagram illustrating a PUSCH RE mapping method when transmission of control information in an LTE (-A) system is piggybacked to a PUSCH. When the simultaneous transmission of the PUCCH and the PUSCH to the uplink in the LTE (-A) system is not configured, the uplink control information (s) set to be transmitted on the PUCCH, i.e., HARQ-ACK, RI, CSI ) Is set to be piggybacked on the PUSCH and transmitted. At this time, the HARQ-ACK is transmitted near the UL DMRS symbol. This is because the closer to the RS symbol the better the channel estimation performance. If the UE does not receive the scheduling assignment on the PDCCH, the eNB expects HARQ-ACK, but the UE may not multiplex the HARQ-ACK on the PUSCH. Accordingly, when rate-matching of the PUSCH is performed in consideration of transmission of the HARQ-ACK, the rate-matching pattern may vary depending on whether the HARQ-ACK is transmitted or not. Therefore, May be affected by not receiving the scheduling assignment on the PDCCH. That is, UL-SCH decoding transmitted on the PUSCH may fail. In order to prevent such a case, in the LTE (-A) system, the HARQ-ACK is punctured on the coded UL-SCH bitstream. Therefore, the bits that are not punctured are not affected by the existence of the HARQ-ACK, so that the rate matching of the UE and the rate matching of the eNB are prevented from being inconsistent with each other. As shown in FIG. 16, the RI is also mapped near the UL DMRS symbol similar to the HARQ-ACK mapping. The reason for mapping RI more strongly is that RI is a prerequisite for accurate interpretation of CQI / PMI. On the other hand, the CQI / PMI is simply mapped over the entire subframe. The modulation scheme for RI is the same as HARQ-ACK. The HARQ-ACK and RI are repeated over all transmission layers and multiplexed with data coded into each layer as in the case of a single layer. The bits may be scrambled differently in different layers. Diversity can be provided by transmitting substantially the same information through different scrambling in a plurality of layers. The basis for reporting the channel state on the PUSCH is aperiodic reporting in which the eNB requests channel state reporting from the terminal by setting the CQI request bit in the scheduling grant. The rate matching of the UL-SCH operates considering the existence of the channel status report. That is, by using a higher coding rate, an appropriate number of resource elements can be used to transmit channel status reports. Since the eNB has explicitly requested the channel status report, the eNB knows the presence of the channel status report naturally, so that appropriate rate-dematching can be performed at the receiving end eNB. Also, if the UE is scheduled to perform PUSCH transmission and the periodic report is set to be transmitted on the PUCCH in the corresponding subframe, the periodic report is also changed to be transmitted on the PUSCH resource. Since the transmission time of the periodic report is set by the RRC signaling and the eNB knows in which subframe the periodic report is transmitted, mismatching between the UE and the eNB does not occur in this case.

In the LTE (-A) system up to the existing Rel-13, if simultaneous transmission of PUSCH and PUCCH is configured in the UE, simultaneous transmission of PUSCH and PUCCH can be performed in the same carrier or between different carriers. However, if simultaneous transmission of PUSCH and PUCCH is not configured in the UE, if the transmission of the PUSCH is not scheduled in the corresponding subframe, uplink control such as HARQ-ACK, RI, CSI (CQI, PMI) (PUSCH) is scheduled to be transmitted to the corresponding subframe, the uplink control information (UCI) such as HARQ-ACK, RI, CSI (CQI, PMI) The transmission is piggybacked to the PUSCH so that only the transmission of the PUSCH having the UCI is performed. This applies equally to different carriers even when carrier aggregation is performed.

In the New Radio (NR) system, long PUCCH and short PUCCH are defined as the transmission format for the PUCCH. A long PUCCH is a PUCCH having a long symbol duration and a PUCCH having four or more symbol durations. A short PUCCH is a PUCCH having a short symbol duration and means a PUCCH having two or less symbol durations. The description of the simultaneous transmission of the PUSCH and the PUCCH under the present invention will mainly be made on the assumption that the transmission is performed by the long PUCCH and the simultaneous transmission by the PUSCH. Simultaneous transmission of the Short PUCCH and the PUSCH will be described separately when necessary.

In the New Radio (NR) system, when concurrent transmission of PUSCH and PUCCH is configured in the UE as in the conventional LTE (-A) system up to Rel-13, simultaneous transmission of PUSCH and PUCCH is performed in the same carrier But also between different carriers. However, if simultaneous transmission of PUSCH and PUCCH is not configured in the UE, if the transmission of the PUSCH is not scheduled in the corresponding subframe, uplink control such as HARQ-ACK, RI, CSI (CQI, PMI) (PUSCH) is scheduled to be transmitted to the corresponding subframe, the uplink control information (UCI) such as HARQ-ACK, RI, CSI (CQI, PMI) The transmission is piggybacked to the PUSCH so that only the transmission of the PUSCH having the UCI is performed. This can be applied equally to different carriers when carrying out carrier aggregation. However, considering beamforming in mmWave in NR, beam management information such as beam related information may be included in UCI. Also in the NR system, a method of performing simultaneous transmission of the PUSCH and the PUCCH in the LTE (-A) can be similarly applied to the UE. That is, the RRC configuration parameter can be set to enable the terminal to perform simultaneous transmission of the PUSCH and the PUCCH, and can be turned on / off.

When the RRC configuration parameter is set to ON / OFF to allow simultaneous transmission of the PUSCH and the PUCCH to the UE, the UEs set to on through the RRC configuration parameter can transmit the PUSCH and the PUCCH simultaneously If PUSCH transmission and PUCCH transmission are set to occur in the same slot, PUCCH transmission and PUSCH transmission can be performed at the same time. In the case where intermodulation distortion (IMD) issues in the UE do not occur or interference due to IMD is set such that the signal attenuation level in the other frequency domain satisfies the RF requirement, the PUSCH in the UE, PUCCH can be transmitted simultaneously or the simultaneous transmission through the RRC setting can be instructed by the IDM or the like, the terminal can selectively transmit one PUSCH / PUCCH or a PUSCH / PUCCH having a separate structure capable of simultaneous transmission .

Transmitter intermodulation is an RF aspect which is an inter-modulation between the transmitted signal and another strong signal transmitted in the vicinity of the base station or terminal. There is therefore a requirement for transmitter intermodulation. In the case of a base station, it is based on a static scenario in which other base station signals are co-located. At this time, the transmission signal shown on the antenna connector of the base station is a 30 dB attenuated value. This is a static scenario and does not allow additional spurious emissions. That is, all spurious emission limits should be met even in the presence of such nearby interference signals. In the case of a terminal, there is a similar requirement based on the scenario in which the transmission signal of another terminal appears to be attenuated by 40 dB to the antenna connector of the terminal. This requirement specifies the minimum value of intermodulation that occurs below the transmitted signal.

Simultaneous transmission of PUSCH and PUCCH leads to severe intermodulation products when frequency resources between two transmissions are widely separated from each other. In other words, considering the PUCCH resource allocation in LTE (-A), the PUCCH can be allocated close to the edge of the UE transmission BW in order to obtain the frequency diversity, so that the PUSCH is set to occupy the entire UE bandwidth An IMD issue may occur. To solve this problem, there may be a method as shown in FIG. 17 below. FIGS. 17A and 17B are diagrams illustrating a method for moving a PUCCH frequency resource to a frequency resource near a PUSCH in order to perform simultaneous transmission of a PUCCH and a PUSCH. That is, the PUCCH can be moved to the PUSCH allocated area adjacent frequency resource so that there is no frequency separation between the PUSCH and the PUCCH, so that the PUCCH and the PUSCH can be simultaneously transmitted. However, this method is disadvantageous in that when the PUCCH is set to perform frequency hopping in the intra-slot or inter-slot to obtain frequency diversity, resources in the ??? ??? region shown in FIG. 17- (a) have. As a method for solving this, there may be a method of moving the resources of the PUCCH into the PUSCH resource, but not performing frequency hopping, as shown in FIG. 17- (b).

18- (a) and 18 (b) illustrate frequency hopping for PUCCH resources, but not all of the PUCCHs as frequency resources adjacent to the PUSCH so as to avoid wasteful resources indicated by " ??? . Therefore, it is a method to prevent the occurrence of the IMD issue at the time of simultaneous transmission of the PUSCH and the PUCCH and obtain the time and frequency diversity for the PUCCH. In FIG. 18, when the total length is referred to as a slot interval, the PUCCH will consider intra-slot frequency hopping when considering PUCCH only transmission instead of allocating the PUCCH to the entire symbol length occupied by the long PUCCH in the slot interval. 18- (b) to obtain additional time / frequency diversity by repetition considering frequency hopping.

FIG. 19 is a diagram illustrating an example in which the IMD issue is solved without performance gain due to frequency diversity for PUCCH transmission at the time of simultaneous transmission of PUCCH and PUSCH. However, compared with FIG. 18, PUCCH is frequency hopped over PUSCH uplink time- So that it is not transmitted.

The PUCCH in Fig. 17 - (a), (b) and Fig. 19 is referred to as PUSCH allocated freq. resource, the allocation of the long PUCCH is not performed at the position of the DM-RS for the PUSCH, so that collision between the DM-RS and the PUCCH of the PUSCH does not occur. This depends on the location of the DM-RS for the PUSCH and the symbol allocation of the long PUCCH should be considered. That is, the DMRS for demodulating the PUSCH in the NR may be considered similar to the DMRS for the PDSCH. Therefore, if the front loaded DMRS is allocated, the first PUSCH starts from the start symbol of the long PUCCH The PUSCH can be set to use a shortened long PUCCH to reduce the collision with the DMRS of the PUSCH or to remove the start symbol or to set the number of symbols that can configure the long PUCCH to be as follows, A method may be considered in which the PUCCH and the PUSCH are simultaneously transmitted using the long PUCCH format of symbol length excluding one symbol of the DMRS.

The set of lengths of symbols that a long PUCCH can occupy in one slot.

6, 7, 8, 9, 10, 11, 12, 13, 14}, the NR-

Also, the PUSCH allocated freq in the case where a long PUCCH consisting of 4 symbols is configured and transmitted from the base station as the minimum number of symbols that can be configured as a long PUCCH. If it is configured to send a PUCCH to a resource,

As one embodiment of the present invention, a method of constructing and transmitting a long PUCCH with three symbols as a shortened long PUCCH can be considered, and a PUCCH can not be transmitted in a symbol in which a base station and a terminal have a DMRS in a PUSCH region So that it is possible to transmit three shortened long PUCCHs.

In another embodiment of the present invention, when the number of symbols constituted by the long PUCCH is configured to four, when the PUCCH is set in the RRC parameter so that simultaneous transmission of PUCCH and PUSCH is allowed, You can disable it. The UE may drop the PUCCH and perform only the transmission of the PUSCH or drop the PUSCH and transmit only the PUCCH.

Also, as another embodiment of the present invention, a method may be considered in which the PUCCH is transmitted or the PUSCH is transmitted according to the UCI type set to be transmitted to the long PUCCH. In the case of HARQ-ACK (s), it may be important information as a response to DL transmission. Therefore, when HARQ-ACK is set to be transmitted on the long PUCCH, only a long PUCCH is transmitted and a PUSCH is not transmitted .

As another embodiment of the present invention, when the long PUCCH configured with four symbols is configured to be configured and transmitted from the base station, the UCI set to be transmitted in the long PUCCH is mapped to the PUSCH according to the UCI mapping method on the predetermined PUSCH resource A method for setting up transmission may be considered.

Also, as another embodiment of the present invention, a method may be considered in which the PUSCH DM-RS in the PUSCH resource region in which the PUCCH is configured to be mobile-forwarded is set to transmit the PUSCH together with the PUCCH composed of four symbols without transmitting.

20 is a diagram illustrating a method for handling a PUSCH DMRS collision in a case where a PUCCH moves to a PUSCH frequency resource according to an embodiment of the present invention. In the case of Figs. 20 (b) and 20 (c), the PUSCH is not allocated in the area to which the PUCCH is allocated. In this case, even if the PUCCH with the PUSCH DMRS collides with the PUSCH DMRS, the PUSCH can be set to use a shortened PUCCH in order to maintain the sequence characteristics for multiplexing and the like. However, if the DMRS of the PUSCH is not configured as a sequence and CDM multiplexing for MU-MIMO with other UEs is not performed, Since the PUCCH is not included in the area where the PUCCH is moved, the long PUCCH can be transmitted as it is, as shown in FIGS. 17 to 19, without using the shortened PUCCH.

As a method for handling PUSCH DMRS collision when PUCCH moves to PUSCH frequency resource, PUSCH DMRS or PUCCH collision occurs when PUCCH collision occurs during PUSCH scheduling. A method of adding an indicator to puncturing one of the symbols to the UL DCI scheduling PUSCH may be considered.

Although the UL centric slot having the UL long duration in the slot format of the present invention is described in the present invention, the present invention can be similarly applied to the UL only slot that can only include the UL transmission in the slot format, Although the shortened PUCCH transmission is performed based on the front loaded DMRS for the DMRS position for the PUSCH, the position of the PUSCH DMRS is allocated to another position, or the RS for improving the performance in the high Doppler environment is additionally provided in addition to the front loaded DMRS The method described in the present invention can be equally used as a method for preventing collision with the PUCCH in the RS.

With respect to the puncturing and rate-matching of the UL-SCH when a PUCCH on the PUSCH is transmitted,

In one embodiment, as shown in FIGS. 17 to 20, when the PUCCH is set to transmit an IMD issue to an area of a specific PUSCH to be transmitted by the mobile station, the PUCCH is always set to be puctured Or PUCCH transmission is periodically set, the PUSCH RE can be set to be always rate-matched because the PUCCH is aware that the BS and the UE are aware of the transmission.

In another embodiment, when the PUCCH is set to transmit and resolve the IMD issue to the specific PUSCH area, as shown in FIGS. 17 to 20, that is, when the PUCCH is set to be transmitted on the PUSCH resource Puncturing the PUCCH RE on the PUSCH resource for the PUCCH to be transmitted including at least one HARQ-ACK, and rate-matching the PUCCH for transmitting the CQI / RI / PMI / Beam related information . If the UE does not receive the scheduling assignment on the PDCCH, the gNB expects HARQ-ACK to the PUCCH on the PUSCH resource, but the UE may not multiplex the PUCCH including the HARQ-ACK in the PUSCH, . Therefore, when the PUCCH is set to perform rate-matching on the assumption that the PUCCH is transmitted to the PUSCH resource in consideration of transmission of the HARQ-ACK, the rate-matching pattern may vary depending on whether or not the HARQ-ACK is transmitted. All coded bits transmitted in the data portion may be affected by the UE not receiving the scheduling assignment on the PDCCH. However, if the periodic report is set to be transmitted on the PUCCH in the corresponding slot or subframe when the UE is scheduled to perform the PUSCH transmission when the information for channel status reporting is periodically transmitted on the PUCCH, PUSCH resource to be transmitted on the PUCCH. In NR, as in LTE (-A), the transmission instant of the periodic report can be set by RRC signaling and the gNB knows which slot or subframe the periodic report is transmitted in. In this case, There is no possibility of mismatch between gNB and gNB.

The present invention relates to a method for simultaneously transmitting and multiplexing a scheduling request (SR) and a HARQ-ACK under a short PUCCH structure that can be transmitted with one symbol or two symbols defined in 3GPP NR.

For a short PUCCH that can be composed of 1 symbol or 2 symbols, there can be two formats depending on the bit szie that can be transmitted. For convenience of explanation, the present invention will be described on the basis of a short PUCCH having one symbol, and the same can be applied to a short PUCCH that can be composed of two symbols.

In constructing a short PUCCH of 2 symbols, the same UCI can be repeatedly transmitted through a 1 symbol short PUCCH to transmit UCI having up to 2 bits, or a method for transmitting different UCIs up to 2 bits to a short PUCCH Can construct two 1 symbol short PUCCHs capable of transmitting different UCIs so that time sensitive information can be transmitted in one symbol short PUCCH at 2 ^nd symbol to guarantee processing time at the terminal, Can be configured to transmit the 1 symbol short PUCCH at 1 ^st symbol so that the UE can transmit the UL control information to be transmitted.

21 is a diagram of a sequence based short PUCCH structure.

As shown in FIG. 21, there is a sequence based short PUCCH structure for differentiating and transmitting different information by CDM based on different cyclic shift (CS) values of the same root sequence. In the figure below, the horizontal axis is a subcarrier in the frequency domain and the vertical axis is a symbol in the time domain. The length of the subcarrier in the frequency domain may be 1RB, 2RB or 3RB, but may be the number of specific RBs in RB units.

22 is a diagram of an FDM based short PUCCH structure.

The FDM based short PUCCH structure shown in FIG. 22 is a structure that differentiates UCD (Uplink Control Information) and RS (reference signal) to be transmitted into FDM by different subcarriers. In the figure below, the horizontal axis is a subcarrier in the frequency domain and the vertical axis is a symbol in the time domain. The length of the subcarrier in the frequency domain may be 1RB, 2RB or 3RB, but may be the number of specific RBs in RB units. In FIG. 22, the ratio of the DMRS to the UCI for the PUCCH is 1: 1 and the overhead for the DMRS is 1/2, as an FDM based short PUCCH structure. However, the DM-RS ratio is 1/2 or 1 / 3, 1/4 or 1/6 can all be considered.

In the case of the short PUCCH in NR, the format to be transmitted may vary according to the payload size of the UCI to be transmitted. First, a sequence based short PUCCH structure can be used when the number of bits of UCI is 2 bits or less, and an FDM based short PUCCH structure can be used when the number of bits of UCI is 2 bits or more.

The present invention proposes a simultaneous transmission and multiplexing method of a scheduling request (SR) and a HARQ-ACK under a short PUCCH structure that can be transmitted with one symbol or two symbols defined in 3GPP NR.

In the case of an SR that can be transmitted by a mobile station in the case where the mobile station desires to transmit a scheduling request from the base station, the mobile station is configured to use the PUCCH in the LTE mode. The base station transmits the SR configuration information to the mobile station, It is possible to transmit through the LTE PUCCH channel when there is an SR to be transmitted. Similarly, in the case of requesting a terminal to request an SR, the NR may be configured to transmit through the PUCCH defined in the NR. At least one bit may be used for the number of bits used in the SR, and in some cases, transmission of multiple bits may be considered.

If the UE is set to give an SR configuration to the UE in the NR, and if the UE is to transmit the NR PUCCH defined in the NR according to the SR configuration, the HARQ- Can overlap with ACK timing. In this case, the simultaneous transmission and multiplexing of the scheduling request (SR) and the HARQ-ACK in the case where the transmission of the SR and the HARQ-ACK are simultaneously performed must be considered.

This is one embodiment of the simultaneous transmission and multiplexing method of the scheduling request (SR) and the HARQ-ACK to the PUCCH similar to the method used in the LTE, and the BS allocates the SR transmission resource and the HARQ-ACK transmission resource to the UE May be considered. That is, when transmitting the SR, the SR is independently transmitted through the PUCCH and the HARQ-ACK transmission resource is also transmitted through the PUCCH. If the SR and the HARQ-ACK are to be simultaneously transmitted, And transmits up to 2 bits of HARQ-ACK to the resource of the SR when it is intended to transmit the transmission of the SRC to the positive SR, and sets up to 2 bits of HARQ-ACK to the resource of the PUCCH set to transmit HARQ- And the base station can detect the PUCCH set as the SR resource and the PUCCH set as the HARQ-ACK resource, so as to detect the positive SR / negative SR of the SR and the maximum 2 bits of the HARQ-ACK . That is, a sequence based short PUCCH as shown in FIG. 21 designed to transmit 2 bits for the corresponding PUCCH transmission can be used.

As one embodiment of the present invention, a method of transmitting in a transmission format of one PUCCH regardless of whether it is a positive SR or a negative SR in a slot or a subframe in which an SR is set to be transmitted according to SR configuration information may be considered. Considering that the resource can be multiplexed with other UEs in the sequence based PUCCH format, it can be used for multiplexing SRs for other UEs. Therefore, it is set to transmit 3 bits or more without using the corresponding SR resource A method of setting to transmit in one FDM-based PUCCH format can be considered. When the 1-bit SR and the 2-bit HARQ-ACK are set to be transmitted, the BS instructs the UE to indicate the FDM based PUCCH resource, and the UE transmits the HARQ-ACK bit for the PDSCH transmitted in the slot or subframe, If the number is 2 bits, UCI including 1 bit SR and HARQ-ACK 2 bits can be transmitted on the FDM based PUCCH resource instructed by the base station. Even when transmission of 3 bits or more is configured by including other UCI type transmission, the UCI can be transmitted to the corresponding FDM based PUCCH resource. The BS can know the number of bits for which the BS expects the HARQ-ACK for transmission of the PDSCH and expect the MS to transmit the PUCCH resource indicated by the BS to the UCI according to the format transmitted from the MS. However, when considering the DTX that misses the PDCCH transmitted by the base station, the base station needs to detect both the resource set by the SR and the resource set by the base station. In other words, when the terminal transmits DTX, the corresponding SR transmission should be transmitted as the SR resource.

As one embodiment of the present invention, a method of transmitting in a transmission format of one PUCCH regardless of whether it is a positive SR or a negative SR in a slot or a subframe in which an SR is set to be transmitted according to SR configuration information may be considered. The sequence based short PUCCH format that transmits up to 2 bits and the FDM based short PUCCH format that transmits more than 3 bits may have different coverage depending on PAPR / CM performance and link performance. That is, the sequence based short PUCCH format has a low PAPR / It can have large coverage, and its link performance is also improved compared to FDM based short PUCCH. Therefore, a method for transmitting 1 bit SR + HARQ-ACK 2 bits up to 3 bits can be considered as a method of transmitting in sequence-based short PUCCH format. The base station sets and multiplexes the 1-bit SR and the 2-bit HARQ-ACK, that is, 3 bits, so as to have different cyclic shifts to the PUCCH resource set to be transmitted to the UE, and transmits the signal to the base station. In this case, in order to maintain the performance of HARQ-ACK 2 bits in the same manner as the transmission of HARQ-ACK only, the interval of cyclic shift for HARQ-ACK 2 bits is equal to the cyclic shift spacing from the maximum of 12 cyclic shifts . For example, {0, 3, 6, 9}, positive SR and negative SR are assigned to different states of HARQ-ACK 2 bits to have CS values of 12/4 = For CS, set CS offset to 1 for negative SR for {0, 3, 6, 9} and positive SR for {1,4,7,10} or {2,5,8,11} A method of setting to distinguish can be considered. However, in the case of the conventional HARQ-ACK only 2 bits transmission, this method guarantees four HARQ-ACK state detection because the performance of the CS interval is guaranteed to be 3. However, when the SR and HARQ-ACK transmission occur simultaneously, performance may degrade at shift intervals. In the case of simultaneous transmission of SR and HARQ-ACK, a maximum number of cyclic shifts is set to 16, and 16/4 = 4 to indicate four states for transmission of HARQ-ACK 2 bits {0, 4, 8, 12} are assigned as cyclic shifts so as to have the CS value of the interval of intervals. In case of simultaneous transmission of SR and HARQ-ACK, {0, , And for the discrimination between positive SR and negative SR, set the offset difference of CS to 2 and set it to {0, 4, 8, 12} to indicate the state according to HARQ-ACK bits. , And {2, 6, 10, 14} may be set to be divided into positive SRs. Dividing the positive SR and the negative SR by placing two offsets out of the 16 CS offsets results in robust performance improvement when the delay spread is large compared to putting one offset out of twelve as CS offsets . As a temporal example, CS values are set for different HARQ-ACK states at intervals of Y by total CS value / (2 ^ N) = Y between 16 HARQ-ACK bits (N) (2 ^ N) = Y between the HARQ-ACK bits (N) in the 8 total CS value sets, and CS value for different HARQ-ACK states and divides by one space for separating positive SR and negative SR.

As another embodiment of the present invention, a method may be considered in which the transmission format of the PUCCH is changed according to whether the SR is a positive SR or a negative SR. Considering that the resource can be multiplexed with other UEs for the sequence based PUCCH format, it can be used for multiplexing SRs for other UEs. Therefore, when transmitting without using the corresponding SR resources, The detection performance of the SR can be improved. In addition, since the coverage based on the PAPR / CM performance and the link performance may differ depending on the PUCCH format, which is a sequence based short PUCCH format that transmits up to 2 bits and the FDM based short PUCCH format that transmits more than 3 bits, And the link performance is also improved compared to the FDM based short PUCCH. Therefore, when the UE is configured to transmit the 1-bit SR and the HARQ-ACK 2 bits at the same time, the UE transmits a sequence based short PUCCH resource on the SR resource set by the base station for the negative SR, The base station determines that the corresponding SR is a negative SR, and if the terminal is set to transmit a positive SR, the base station sets the SR to be transmitted in an FDM-based PUCCH format configured to transmit 3 bits or more Can be considered. In this case, a resource based on a PUCCH can be set to transmit up to 2 bits. The transmission resource of the PUCCH is used for SR only transmission, up to 2 bits for HARQ-ACK only, and negative SR And a maximum 2 bits HARQ-ACK, and the FDM based short PUCCH resource which can be set to transmit 3 bits or more is set as a purpose for 3 bits transmission including positive SR and 2 bits HARQ-ACK . When a 1-bit SR and a 2-bit HARQ-ACK are set to be transmitted, the BS instructs the UE to indicate an FDM based PUCCH resource, and the UE transmits a HARQ-ACK bit for the PDSCH transmitted in the slot or subframe, If the number is 2 bits, 3 bits UCI including 1 bit SR and HARQ-ACK 2 bits can be transmitted on the FDM based PUCCH resource instructed by the base station. Even when transmission of 3 bits or more is configured by including other UCI type transmission, the UCI can be transmitted to the corresponding FDM based PUCCH resource.

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, apparatus and system for multiplexing uplink channels, signal and data channels for a wireless communication system.

Images