WO2017176044A1

WO2017176044A1 - Method and device for uplink transmission using extended uplink subframe

Info

Publication number: WO2017176044A1
Application number: PCT/KR2017/003716
Authority: WO
Inventors: 김철순; 문성현; 김지형
Original assignee: 한국전자통신연구원
Priority date: 2016-04-05
Filing date: 2017-04-05
Publication date: 2017-10-12

Abstract

Provided is an uplink transmission method of a first communication node. When an uplink pilot time slot (UpPTS) of a special subframe and a first uplink (UL) subframe are aggregated as an extended UL subframe, the first communication node receives a reference signal configuration for the UpPTS from a second communication node. Further, when the number of time domain symbols belonging to the UpPTS is equal to or smaller than a predetermined number, the first communication node allocates a reference signal to the first UL subframe among the UpPTS and the first UL subframe on the basis of the reference signal configuration.

Description

Method and apparatus for uplink transmission using extended uplink subframe

The present invention relates to an uplink transmission method and apparatus using an extended uplink subframe, and a communication method and apparatus using an extended uplink subframe.

In particular, the present invention relates to a method and apparatus for improving uplink transmission using a long term evolution (LTE) mixed subframe.

In next generation communication systems, both mobile broadband (MBB) scenarios and ultra reliable and low latency communications (URLLC) scenarios are considered.

To satisfy the URLLC scenario, a time division duplexing (TDD) radio frame has a shorter uplink (UL) -downlink (DL) switching period, so that UL transmission and DL It is desirable for transmissions to be assigned more often. This has the effect of reducing a hybrid automatic repeat and request (HARQ) round trip time (RTT).

However, since a guard symbol for a switching delay or a propagation delay must be allocated in the UL-DL switching period, transmission or throughput is reduced. This is therefore undesirable for MBB scenarios.

In order to satisfy both the MBB scenario and the URLLC scenario, the tradeoff between the switching period and the guard symbol must be properly considered.

An object of the present invention is to provide a TDD radio frame in which a switching period is allocated every subframe and a guard symbol is allocated every two subframes.

Another object of the present invention is to provide a method and apparatus for increasing a transmission amount of a long term evolution (LTE) uplink and reducing a transmission delay of the uplink.

According to an embodiment of the present invention, an uplink transmission method of a first communication node is provided. The uplink transmission method includes a case where an uplink pilot time slot (UpPTS) and a first uplink (UL) subframe of a special subframe are aggregated as an extended UL subframe. Receiving a reference signal setting for the UpPTS from a second communication node; And assigning a reference signal to the first UL subframe among the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS is less than or equal to a predetermined number. do.

The predetermined number may be three.

The reference signal may be a demodulation (DM) -reference signal (RS).

Allocating a reference signal to the first UL subframe may include allocating the reference signal to each of a first slot and a second slot belonging to the first UL subframe.

In the uplink transmission method, when the number of time domain symbols belonging to the UpPTS exceeds the predetermined number, the reference signal is allocated to the UpPTS and the first UL subframe based on the reference signal setting. It may further comprise a step.

The allocating of the reference signal to the UpPTS and the first UL subframe may include allocating the reference signal to a fourth time domain symbol at an end of time domain symbols belonging to the UpPTS.

The first UL subframe may include a first slot and a second slot next to the first slot.

The orthogonal cover code (OCC) or cyclic shift for the reference signal allocated to the UpPTS may be the same as the OCC or cyclic shift for the reference signal allocated to the second slot.

The same physical uplink shared channel (PUSCH) transmit power control (TPC) may be applied to the special subframe and the first UL subframe.

The uplink transmission method may further include receiving one UL grant for scheduling of the extended UL subframe from the second communication node.

The one UL grant may be based on the index of the first UL subframe.

In the uplink transmission method, when a physical hybrid automatic repeat and request indicator channel (PHICH) is received from a second downlink node in a downlink (DL) subframe having an index of n, a PUSCH (physical) for retransmission is received. The method may further include transmitting an uplink shared channel) in the extended UL subframe having an index of (n + k).

The index of the first UL subframe may be (n + k), and the index of the special subframe may be (n + k-1).

The uplink transmission method may further include transmitting a physical uplink shared channel (PUSCH) to the second communication node in the extended UL subframe having an index (n-k); And receiving, from the second communication node, a physical hybrid automatic repeat and request indicator channel (PHICH) for the PUSCH in a downlink (DL) subframe having an index of n.

The index of the first UL subframe may be (n-k), and the index of the special subframe may be (n-k-1).

In addition, according to another embodiment of the present invention, an uplink (UL) transmission method of a first communication node is provided. The uplink transmission method transmits a UL data channel to a second communication node in an uplink pilot time slot (UpPTS) of a special subframe and an extended UL subframe in which a first UL subframe is aggregated. Doing; And receiving, from the second communication node, a response channel for the UL data channel in a first downlink (DL) subframe.

The index of the extended UL subframe may be determined to be the same as the index of the first UL subframe.

The index of each of the special subframe and the first UL subframe may be (n-k-1), (n-k), and the index of the first DL subframe may be n.

The uplink transmission method may further include receiving an UL grant for the extended UL subframe in a second DL subframe from the second communication node.

The index of the second DL subframe may be determined based on the index of the first UL subframe.

The uplink transmission method may further include allocating a DM (demodulation) -RS (RS) to the UpPTS according to the number of time domain symbols belonging to the UpPTS.

Allocating a DM-RS to the UpPTS may include assigning the DM-RS to the first UL subframe among the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS is 3 or less. Assigning; And when the number of time domain symbols belonging to the UpPTS is four or more, allocating the DM-RS to the UpPTS and the first UL subframe.

In addition, according to another embodiment of the present invention, a communication method of an evolved node B (eNB) is provided. The communication method may be performed when an uplink pilot time slot (UpPTS) and a first uplink (UL) subframe of a special subframe are aggregated as an extended UL subframe. Determining a demodulation (DM) -reference signal (DM) configuration for the extended UL subframe based on the number of time domain symbols belonging to an UpPTS; And transmitting the DM-RS configuration to a user equipment (UE).

The determining of the DM-RS configuration may include: assigning the DM-RS to the first UL subframe among the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS is less than or equal to a predetermined number. In an embodiment, the method may include determining the DM-RS configuration.

The determining of the DM-RS configuration may include: assigning the DM-RS to the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS exceeds a predetermined number. Determining an RS setting.

The communication method may further include transmitting a UL grant for the extended UL subframe to the UE in a first downlink (DL) subframe.

The index of the extended UL subframe may be determined to be the same as the index of the first UL subframe, and the index of the first DL subframe may be determined based on the index of the first UL subframe.

The communication method may include transmitting a physical hybrid automatic repeat and request indicator channel (PHICH) to the UE in a first downlink (DL) subframe; And receiving a physical uplink shared channel (PUSCH) for retransmission from the UE in the extended UL subframe.

The index of the first DL subframe is n, the index of the extended UL subframe is (n + k), the index of the first UL subframe is (n + k), and the index of the special subframe is (n + k-1).

The communication method includes receiving a physical uplink shared channel (PUSCH) from the UE in the extended UL subframe; And transmitting a physical hybrid automatic repeat and request indicator channel (PHICH) for the PUSCH to the UE in a first downlink (DL) subframe.

The index of the extended UL subframe is (nk), the index of the first DL subframe is n, the index of the first UL subframe is (nk), and the index of the special subframe is (nk-1). Can be).

According to an embodiment of the present invention, uplink data is allocated to an extended mixed subframe, so that a larger amount of uplink data may be transmitted in a mixed subframe.

1A and 1B are diagrams illustrating channel mapping for an MBB scenario.

2 is a diagram illustrating a serving cell eNB and a UE according to an embodiment of the present invention.

3 is a diagram illustrating an extended UL subframe in which UpPTS of a special subframe n and a normal UL subframe (n + 1) are aggregated through the method M100 according to an embodiment of the present invention.

4A, 4B, and 4C are diagrams illustrating extended UL subframes having a DM-RS symbol according to an embodiment of the present invention.

5A and 5B illustrate PUSCH rate matching for a case where an SRS symbol and a DM-RS symbol coincide with each other according to an embodiment of the present invention.

FIG. 6A is a diagram illustrating a single carrier scenario, and FIG. 6B is a diagram illustrating a multicarrier scenario.

7A and 7B are diagrams illustrating collision of a PUCCH.

8 is a diagram illustrating a method of multiplexing a base HARQ-ACK to an sPUCCH or an sPUSCH according to an embodiment of the present invention.

9A, 9B, and 9C are diagrams illustrating RE mapping of sPUXCH and bPUSCH according to an embodiment of the present invention.

10A and 10B are diagrams illustrating resource blocks of PUCCH format 1, 1a, or 1b according to an embodiment of the present invention.

11A and 11B are diagrams illustrating a resource block of LTE PUCCH format 3 according to an embodiment of the present invention.

12A and 12B illustrate slots of the LTE PUCCH format 4 when a normal CP is used according to an embodiment of the present invention.

13A and 13B illustrate slots of an LTE PUCCH format 5 when a normal CP is used according to an embodiment of the present invention.

14A and 14B illustrate puncturing of short PUCCH according to an embodiment of the present invention.

FIG. 15 illustrates a case in which three UL control subslots are configured in a base PUCCH having seven UL symbols according to an embodiment of the present invention.

16A and 16B illustrate a case in which a base PUCCH is punctured through one short PUCCH according to an embodiment of the present invention.

17A and 17B illustrate a case in which a base PUCCH is punctured through two or more short PUCCHs according to an embodiment of the present invention.

18A and 18B are diagrams illustrating a RE mapping method of a sequence (sequence) according to an embodiment of the present invention.

19 illustrates a UL control subslot structure using a PUSCH PRB according to an embodiment of the present invention.

20 is a diagram of a computing device, in accordance with an embodiment of the invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

In this specification, duplicate descriptions of the same components are omitted.

Also, in the present specification, when a component is referred to as being 'connected' or 'connected' to another component, the component may be directly connected to or connected to the other component, but in between It will be understood that may exist. On the other hand, in the present specification, when a component is referred to as 'directly connected' or 'directly connected' to another component, it should be understood that there is no other component in between.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Also, in this specification, the singular forms may include the plural forms unless the context clearly indicates otherwise.

Also, as used herein, the term 'comprises' or 'having' is only intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more. It is to be understood that it does not exclude in advance the possibility of the presence or addition of other features, numbers, steps, actions, components, parts or combinations thereof.

Also in this specification, the term 'and / or' includes any combination of the plurality of listed items or any of the plurality of listed items. In the present specification, 'A or B' may include 'A', 'B', or 'both A and B'.

Also, in the present specification, user equipment (UE) includes a terminal, a mobile terminal, a mobile station, an advanced mobile station, and a high reliability mobile station. ), A subscriber station, a portable subscriber station, an access terminal, and the like, and may include a terminal, a mobile terminal, a mobile station, an advanced mobile station, a high reliability mobile station, It may also include all or part of the functions of the subscriber station, portable subscriber station, access terminal and the like.

Also, in the present specification, an evolved node B (eNB) includes a node B (NB), a gNB, a base station (BS), an advanced base station, and a high reliability base station (high). reliability base station, access point, radio access station, base transceiver station, mobile multihop relay (MSR) -BS, relay station serving as base station, base station A high reliability relay station, a repeater, a macro base station, a small base station, and the like, which may serve as Node B, gNB, base station, advanced base station, HR-BS, access point, radio access station, It may include all or part of the functions of a transmission / reception base station, an MMR-BS, a repeater, a high reliability repeater, a repeater, a macro base station, a small base station, and the like.

For convenience of description, an unpaired spectrum is considered in this specification, and carrier aggregation and half duplex communication are not considered. However, this is only an example, and the present invention can be extended for carrier aggregation and half duplex communication through the contents described herein.

1A and 1B are diagrams illustrating channel mapping for an MBB scenario.

In detail, FIG. 1A illustrates downlink channel mapping, and FIG. 1B illustrates uplink channel mapping.

In FIG. 1A, paging control channel (PCCH), broadcast control channel (BCCH), common control channel (CCCH), dedicated control channel (DCCH), and dedicated traffic channel (DTCH) are logical channels, and PCH ( paging channel (BCH), broadcast channel (BCH), and shared channel (DL-SCH) are transport channels (PDCCH), physical downlink control channel (PDCCH), physical broadcast channel (PBCH), physical downlink shared channel (PDSCH), And PHICH (physical HARQ indicator channel) is a physical channel (physical channel).

As illustrated in FIG. 1A, the PCCH, which is a logical channel, is mapped to PCH, which is a transport channel, and the PCH, which is mapped to PDSCH, which is a physical channel. BCCH, which is a logical channel, is mapped to BCH or DL-SCH, which is a transport channel, and BCH, is mapped to PBCH, which is a physical channel. The CCCH, DCCH, or DTCH, which is a logical channel, is mapped to DL-SCH, which is a transport channel, and the DL-SCH is mapped to PDSCH, which is a physical channel.

In FIG. 1B, CCCH and DCCH are logical channels, UL-SCH and random access channel (RACH) are transport channels, and physical uplink shared channel (PUSCH) and physical random access channel (PRACH) are physical channels.

As illustrated in FIG. 1B, the logical channel CCCH or DCCH is mapped to the transport channel UL-SCH, and the UL-SCH is mapped to the physical channel PUSCH. RACH, which is a transport channel, is mapped to PRACH, which is a physical channel.

Serving cell eNB refers to an eNB serving (or providing) a serving cell. Specifically, the serving cell eNB is controlled by the eNB controller. Each of the serving cell eNB and the UE includes a physical layer, its upper layer, a transmitting unit, a receiving unit, and an antenna.

Signals transmitted by the serving cell (or serving cell eNB) are DL HARQ- for decoding scheduling (DL), DL data, DL reference signal (RS), synchronization signal, and UL data decoding for DL data and UL data. ACK (acknowledgement / negative acknowledgment) and the like.

The UE receives the SA, transmits UL data and UL RS, performs an RACH procedure, and performs an operation such as UL HARQ-ACK for DL data decoding.

In order to reduce the HARQ RTT of the TDD system, a method of reducing the time required for DL assignment, DL data burst, and UL HARQ may be considered.

Long term evolution (LTE) TDD and LTE frequency division duplex (FDD) allocate DL allocation (e.g. PDCCH) and DL data burst (e.g. PDSCH) in the same subframe, from which the UL after k subframes Perform HARQ. Here, the value of k is a value defined in the LTE standard, k for LTE FDD is 4, and k for LTE TDD has a different value according to UL-DL subframe configuration. By improving this k, a method of performing DL assignment, DL data burst, and UL HARQ within one mixed subframe (eg, corresponding to k = 0) may be considered. .

In an LTE TDD system, since one or two time domain symbols are allocated for an uplink pilot time slot (UpPTS), the UE may transmit a physical (HY) RS and a PRACH preamble, but the serving cell (or serving cell eNB) may use the UpPTS. The PUCCH and the PUSCH are not allocated in the region. In this specification, a case where the time domain symbol is an orthogonal frequency division multiplexing (OFDM) symbol or a single carrier (SC) -frequency division multiple access (FDMA) symbol will be described as an example. However, this is only an example and an embodiment of the present invention may be applied even when the time domain symbol is a symbol different from an OFDM symbol or an SC-FDMA symbol.

For extended UpPTS introduced in LTE Rel-13, four or six time domain symbols can be allocated. Thus and for the UpPTS introduced in LTE Rel-14, PUSCH may be allocated in one, two, three, four, five, or six time domain symbols. Therefore, in UpPTS, the serving cell (or serving cell eNB) can allocate the PUSCH.

Hereinafter, a method of transmitting UL data in an extended UpPTS including an UpPTS and three or more time domain symbols will be described. In the case where DL assignment, DL data burst, and UL HARQ are performed in one special subframe, a collision problem of PUCCH may be solved through the above-described methods.

The special subframe includes a downlink pilot time slot (DwPTS), a guard period (GP), and an UpPTS.

In case of UL-DL subframe configuration 0 for LTE TDD, the serving cell (or serving cell eNB) is the UL for UL subframes (n + 6) and (n + 7) in special subframe n. Send a grant. A bitmap is allocated to a downlink control information (DCI) format for this purpose, and a UL subframe index to which a UL grant is applied is designated. For example, if the bitmap is '10', the UL grant is applied to the UL subframe (n + 6), if the bitmap is '01', the UL grant is applied to the UL subframe (n + 7) and the bit is If the map is '11', the UL grant is applied to UL subframes (n + 6) and (n + 7).

UL resource allocation is commonly applied to subframes (n + 6) and (n + 7), so that scheduling flexibility and overhead reduction are adjusted.

In the case of UL-DL subframe configuration 0 for TDD, in order for the UE to transmit a PUSCH in a special subframe, a UL grant different from the UL grant of LTE is required.

Since the PUSCH starting symbol index for the UpPTS and the normal UL subframe is different and the number of resource elements (RE) for the UpPTS and the normal UL subframe is different, the resource block (RB) assignment and If a modulation and coding scheme (MCS) is commonly applied, the UE may obtain a block error rate (BLER) differently.

If the number of time domain symbols belonging to the UpPTS is small, if the UL grant is defined separately, since the transport block size (TBS) is defined in the normal UL subframe, the TBS table considering UpPTS should be defined separately. Otherwise, the TBS applied to the normal UL subframe in the fewer UL symbols belonging to UpPTS should be reused. Thus, in order for the same TBS to be supported in a small number of UL symbols, the serving cell (or serving cell eNB) must allocate a large number of RBs to the UE, which affects UL coverage.

A method of aggregating the special subframe n and the UL subframe n + 1 (hereinafter, 'method M100') will be described.

3 is a diagram illustrating an extended UL subframe in which UpPTS of a special subframe n and a normal UL subframe (n + 1) are aggregated through the method M100 according to an embodiment of the present invention. Specifically, FIG. 3 illustrates a resource grid when UpPTS is defined in two time domain symbols. In FIG. 3, the horizontal axis represents time domain symbols and the vertical axis represents subcarriers.

In an LTE system, one DM-RS symbol (e.g., DM-RS) per slot, such that the DM (demodulation) -RS is located in the middle of the slot (e.g., in the case of normal CP, time domain symbol index 3) Time domain symbols) are allocated, and orthogonal cover code (OCC) 2 is applied between two DM-RS symbols. The DM-RS symbol index follows the time domain symbol index 3 according to a value defined in the Rel-13 technical specification (TS).

In detail, FIG. 4A illustrates an extended UL subframe when UpPTS occupies two time domain symbols, and FIG. 4B illustrates an extended UL subframe when UpPTS occupies four time domain symbols. An extended UL subframe is illustrated when UpPTS occupies six time domain symbols.

A communication node (eg, UE) may receive a DM-RS configuration for UpPTS from another communication node (eg, eNB). In detail, the communication node (eg, eNB) may configure DM-RS for UpPTS through RRC setting to the communication node (eg, UE). For example, the communication node (eg, eNB) may determine the DM-RS configuration based on the number of time domain symbols belonging to the UpPTS, and may transmit the determined DM-RS configuration to the UE.

When the number of time domain symbols belonging to the UpPTS is 3 or less, the communication node (eg, the UE) may allocate the DM-RS only to the normal UL subframe among the UpPTS and the normal UL subframe based on the DM-RS configuration. have. When the number of time domain symbols belonging to the UpPTS is four or more, the communication node (eg, the UE) may allocate the DM-RS to the UpPTS and the normal UL subframe based on the DM-RS configuration. That is, the communication node (eg, UE) may allocate the DM-RS to the UpPTS according to the number of time domain symbols belonging to the UpPTS.

As illustrated in FIG. 4A, when UpPTS occupies one or two time domain symbols in an extended UL subframe, a separate PUSCH DM-RS for UpPTS may not be allocated, and each of the normal UL subframes may be allocated. One DM-RS symbol may be allocated to each UL slot.

On the other hand, when UpPTS occupies more than half of UL slots (eg, four or more time domain symbols) in an extended UL subframe, one DM-RS symbol may be allocated for UpPTS, and One DM-RS symbol may be allocated to each UL slot. The communication node (eg, UE) may allocate the DM-RS to the fourth time domain symbol (eg, symbol index 3) at the end of the time domain symbols belonging to the UpPTS.

For example, according to the number of time domain symbols included in the UpPTS, the extended UL subframe may have the shape of FIG. 4B or 4C.

4B and 4C illustrate a case in which an extended UL subframe has three DM-RS symbols. In this case, the OCC of the DM-RS symbol allocated to the UpPTS region uses the OCC of the DM-RS symbol allocated to the second UL slot (eg, slot 1) region of the normal UL subframe.

In addition, the cyclic shift of the DM-RS symbol allocated to the UpPTS region (

) Uses a cyclic shift of the DM-RS symbol allocated to the second UL slot (eg, slot 1) region of the normal UL subframe. That is, the OCC or cyclic shift for the DM-RS allocated to UpPTS may be the same as the OCC or cyclic shift for DM-RS allocated to slot 1.

In the extended UL subframe, PUSCH rate matching may be defined to avoid collisions when a sounding reference signal (SRS) is configured.

In the extended UL subframe, the same PUSCH transmit power control (TPC) may be applied to the special subframe and the UL subframe. The point in time at which the serving cell (or serving cell eNB) transmits a TPC command for PUSCH transmission in the extended UL subframe to the UE is set to the UL subframe index, not the index of the special subframe. The range to which the TPC command received by the UE from the serving cell (or serving cell eNB) is applied is when the UE transmits the PUSCH only in the UL subframe without transmitting the PUSCH in the special subframe and the PUSCH in the extended UL subframe. It may include all cases of transmitting.

A communication node (eg, a UE) may receive one UL grant for scheduling of an extended UL subframe from a communication node (eg, an eNB).

In order to allocate a PUSCH in an extended UL subframe, a UL grant is transmitted based on a normal UL subframe index. That is, a subframe in which a UL grant for a PUSCH to be transmitted in an extended UL subframe may be transmitted may be based on a normal UL subframe index. For example, if the extended UL subframe is configured with subframe indexes {1, 2}, the UL grant is transmitted to the UE, as the PUSCH is transmitted at subframe index 2. For another example, when the extended UL subframe is configured with subframe indexes {6, 7}, the UL grant is transmitted to the UE, as the PUSCH is transmitted at subframe index 7. The time relationship between the UL grant and the PUSCH of the extended UL subframe follows the relationship defined in the existing LTE standard (eg, Rel-13 TS 36.213). If the PDCCH is transmitted at DL subframe index n, the PUSCH for it is transmitted at UL subframe index (n + k). Here, the value of k is defined in Rel-13 TS 36.213 table 8-2 or section 8. That is, the index of the DL subframe in which the UL grant for the extended UL subframe is transmitted may be determined based on the index of the UL subframe included in the extended UL subframe.

When the UE retransmits the PUSCH transmitted in the extended UL subframe, or when the subframe in which the PUSCH is retransmitted is a normal UL subframe, the serving cell (or serving cell eNB) is applied to the MCS to be applied to the PUSCH to be retransmitted through the UL grant. The offset may be separately included in the UL grant and signaled (adaptive retransmission).

The retransmission timing in the extended UL subframe may be determined based on the index of the normal UL subframe. This has the advantage that a new UL grant does not have to be transmitted while backward compatibility of LTE is observed.

Hereinafter, a timing relationship applied to a method of transmitting a PUSCH in an extended UL subframe that receives a PHICH subframe and performs retransmission thereof will be described. Here, when the subframe index is 10 or more, 1 is added to the radio frame index, and 10 is subtracted from the value of the subframe index.

For example, if the extended UL subframe includes special subframe 1 and UL subframe 2, the subframe index for the extended UL subframe is 2. For another example, if the extended UL subframe includes special subframe 6 and UL subframe 7, the subframe index for the extended UL subframe is 7. In this case, the PHICH subframe and the PUSCH subframe which performs retransmission thereof may be determined as defined in the existing LTE standard (eg, Rel-13 TS 36.213). The PHICH is transmitted in DL subframe n and the PUSCH for it is transmitted in UL subframe (n + k). Here, the value of k is defined in Rel-13 TS 36.213 table 8-2 or section 8.

In other words, in case of the TDD UL / DL subframe configuration 2 of LTE, if the PHICH is transmitted in the DL subframe index 3, the PUSCH performing retransmission for it is transmitted in the UL subframe index 7. If the PHICH is transmitted at DL subframe index 8, the PUSCH performing retransmission for it is transmitted at UL subframe index 12. To simplify this, (PHICH, PUSCH) may be expressed as (3, 7) or (8, 12).

The above rule applies to this. If the PHICH is transmitted in DL subframe index 3, the PUSCH performing retransmission for it is transmitted in extended UL subframe index 7 (eg, the extended UL subframe consists of subframe index {6, 7}). If the PHICH is transmitted in DL subframe index 8, the PUSCH performing retransmission for it is transmitted in extended UL subframe index 12 (eg, the extended UL subframe consists of subframe index {1, 2}). To simplify this, (PHICH, second PUSCH) may be expressed as (3, 7) or (8, 12), and (PHICH, first PUSCH) is expressed as (3, 6) or (8, 11). May be

That is, when a communication node (eg, a UE) receives a PHICH from a communication node (eg, an eNB) in a DL subframe n, a PUSCH for retransmission is performed in the extended UL subframe index (n + k). , eNB). Here, the indices of the special subframe and the normal UL subframe included in the extended UL subframe are (n + k-1) and (n + k).

In addition, in case of the TDD UL / DL subframe configuration 3 of LTE, Rel-13 TS 36.213 table 8-2 is applied. If the PHICH is transmitted at DL subframe index 0, the PUSCH performing retransmission for it is transmitted at UL subframe index 4. If the PHICH is transmitted at DL subframe index 8, the PUSCH performing retransmission for it is transmitted at UL subframe index 12. If the PHICH is transmitted at DL subframe index 9, the PUSCH performing retransmission for it is transmitted at UL subframe index 13. To simplify this, (PHICH, PUSCH) may be expressed as (0, 4), (8, 12), or (9, 13).

The above rule applies to this. If the PHICH is transmitted in DL subframe index 8, the PUSCH performing retransmission for it is transmitted in extended UL subframe index 2 (eg, the extended UL subframe consists of subframe index {1, 2}). To simplify this, (PHICH, second PUSCH) may be represented as (8, 12), and (PHICH, first PUSCH) may be represented as (8, 11).

In addition, in case of the TDD UL / DL subframe configuration 6 of LTE, Rel-13 TS 36.213 table 8-2 is applied. If the PHICH is transmitted at DL subframe index 0, the PUSCH performing retransmission for it is transmitted at UL subframe index 7. If the PHICH is transmitted in DL subframe index 1, the PUSCH performing retransmission for it is transmitted in UL subframe index 8. If the PHICH is transmitted in DL subframe index 5, the PUSCH performing retransmission for it is transmitted in UL subframe index 12. If the PHICH is transmitted in DL subframe index 6, the PUSCH performing retransmission for it is transmitted in UL subframe index 13. If the PHICH is transmitted at DL subframe index 9, the PUSCH performing retransmission for it is transmitted at UL subframe index 14. To simplify this, (PHICH, PUSCH) may be expressed as (0, 7), (1, 8), (5, 12), (6, 13), or (9, 14).

The above rule applies to this. If the PHICH is transmitted at DL subframe index 0, the PUSCH performing retransmission for it is transmitted at an extended UL subframe index 7 (eg, the extended UL subframe consists of subframe index {6, 7}). If the PHICH is transmitted in DL subframe index 5, the PUSCH performing retransmission for it is transmitted in extended UL subframe index 12 (eg, the extended UL subframe consists of subframe index {1, 2}). To simplify this, (PHICH, second PUSCH) may be represented as (0, 7) or (5, 12), and (PHICH, first PUSCH) is represented as (0, 6) or (5, 11). May be

The above-described scheme may be applied even when the TDD UL / DL subframe configuration is different from the above-described example.

A method of separately defining a UL grant for only a special subframe n (hereinafter, 'method M200') will be described. The method M200 does not apply to an extended UL subframe or a normal UL subframe, but only to UpPTS belonging to a special subframe n. If method M200 is used, there are two UL grants for PUSCH to be transmitted in an extended UL subframe. In this case, the UE should receive both the UL grant for the special subframe and the UL grant for the normal UL subframe.

For the PUSCH transmitted in the extended UL subframe, if the special subframe and the normal UL subframe are scheduled by different UL grants, the following method M210 and method M220 may be used.

Method M210 for method M200 is a method in which a UL grant for allocating a PUSCH in a special subframe includes both an RB assignment and an MCS. The method M210 may be applied not only when a PUSCH is transmitted in an extended UL subframe but also when a PUSCH is transmitted using only a special subframe.

Method M220 for method M200 is a UL grant for allocating a PUSCH in a special subframe and a UL grant for allocating a PUSCH in a normal UL subframe, wherein the RB assignments are unified with each other while the MCS is separately This is how it is defined. In the method M220, since the RB allocation for the special subframe and the RB allocation for the normal UL subframe are the same, only one UL grant may include RB allocation information. For example, RB allocation information may be included only in the UL grant scheduling the normal UL subframe, and RB allocation information may not be included in the UL grant scheduling the special subframe. In this case, the UE may apply RB allocation information in the same way to the special subframe and the normal UL subframe.

Method M221 for method M220 is a method in which a UL grant includes an MCS offset. If only the difference between the MCS1 to be applied to the PUSCH transmitted in the special subframe and the MCS2 to be applied to the PUSCH transmitted in the normal UL subframe (eg, MCS2-MCS1) is included in the UL grant, the number of bits for encoding of the MCS may be reduced. have. For example, in order to indicate to the UE MCS1 to be applied to the PUSCH to be transmitted in the special subframe, the UL grant for the PUSCH to be transmitted in the special subframe may include (MCS2-MCS1). The UE may derive MCS1 by further receiving the UL grant for the PUSCH to be transmitted in the normal UL subframe and then decoding the MCS2. In another example, since the special subframe always occurs before the normal UL subframe, the UL grant for the PUSCH to be transmitted in the special subframe includes MCS1, and the UL grant for the PUSCH to be transmitted in the normal UL subframe is (MCS2-MCS1). In this case, the UE can obtain MCS1 and MCS2 at an earlier time.

The MCS offset may include both negative and positive numbers. The MCS offset contains only positive numbers when the TBS increases above the reference TBS, and the MCS offset contains only negative numbers when the TBS decreases below the reference TBS. The MCS applied to the PUSCH to be transmitted in the UpPTS is determined for each TB (MCS + MCS offset). The method of receiving the MCS and the MCS offset by the UE follows the above-described method.

Method M230 for method M200 performs adaptive retransmission.

The serving cell (or serving cell eNB) transmits the PHICH in subframe n, and in case of negative acknowledgment (NACK), the UE may retransmit the PUSCH in subframe (n + g). Here, the value of g may be set to the UE according to the standard or according to higher layer signaling.

The PHICH is transmitted in the DL subframe or in the DwPTS of the special subframe, and is transmitted in the subframe (n + k). Here, the value of k is determined to be a predetermined value defined in TS. If the UE does not receive the UL grant of the TB within the time window, the UE considers the decoding for that TB successful in the serving cell (or serving cell eNB). In such a case, the UE may flush the TB from the soft buffer. In order to support the retransmission procedure described above, the UL grant must include at least an index of the HARQ process.

On the other hand, when a PUSCH is allocated to an extended UL subframe, the UE transmits a PUSCH and receives a HARQ-ACK for it from the serving cell (or serving cell eNB) through the PHICH. The transmission time of the PHICH may be calculated based on the normal UL subframe index (eg, 2 or 7) on which the PUSCH is transmitted. Here, when the subframe index is 10 or more, 1 is added to the radio frame index, and 10 is subtracted from the value of the subframe index.

For example, in the case where the timing of the PHICH subframe is applied to the extended UL subframe, when the extended UL subframe includes the special subframe 1 and the UL subframe 2, the subframe index for the extended UL subframe is 2 For another example, if the extended UL subframe includes the special subframe 6 and the UL subframe 7, the subframe index for the extended UL subframe is 7. That is, the extended UL subframe index may be determined to be the same as the index of the UL subframe included in the extended UL subframe.

In addition, when timing of an extended PUSCH subframe is applied to a PHICH subframe, when the extended UL subframe includes the special subframe 1 and the UL subframe 2, the subframe index for the extended UL subframe is 2. . For another example, if the extended UL subframe includes special subframe 6 and UL subframe 7, the subframe index for the extended UL subframe is 7. In this case, the PUSCH subframe and the PHICH subframe transmitted therefor may be determined, as defined in the existing LTE standard (eg, Rel-13 TS 36.213). PUSCH is transmitted in UL subframe (n−l) and PHICH for it is transmitted in DL subframe n. Here, the value of l is defined in Rel-13 TS 36.213 table 8.3-1 and section 8.

In other words, in case of the TDD UL / DL subframe configuration 2 of LTE, if the UE transmits the PUSCH in the UL subframe index 2, the serving cell (or serving cell eNB) sends a PHICH thereto for the DL subframe. Transmit at frame index 8. If the PUSCH is transmitted at UL subframe index 7, the PHICH for it is transmitted at DL subframe index 13. To simplify this, (PUSCH, PHICH) may be expressed as (2, 8) or (7, 13).

The above rule applies to this. If a PUSCH is transmitted at extended UL subframe index 2 (eg, an extended UL subframe consists of subframe index {1, 2}), the PHICH for it is transmitted at DL subframe index 8. If the PUSCH is transmitted in extended UL subframe index 7 (eg, the extended UL subframe consists of subframe index {6, 7}), the PHICH for it is transmitted in DL subframe index 13. To simplify this, (second PUSCH, PHICH) may be represented as (2, 8) or (7, 13), and (first PUSCH, PHICH) is represented as (1, 8) or (6, 13). May be

That is, a communication node (e.g., UE) may transmit a UL data channel (e.g., PUSCH) to a communication node (e.g., eNB) at an extended UL subframe index (nl), and UL data from the communication node (e.g., eNB). A response channel (eg PHICH) for the channel (eg PUSCH) may be received at DL subframe index n. Here, the indices of the special subframe and the normal UL subframe included in the extended UL subframe are (n−l−1) and (n−l), respectively.

In the case of the TDD UL / DL subframe configuration 3 of LTE, if the UE transmits the PUSCH in the UL subframe index 2, the serving cell (or serving cell eNB) for the UE has a DL subframe index 8 Transfer from If the PUSCH is transmitted at UL subframe index 3, the PHICH for it is transmitted at DL subframe index 9. If the PUSCH is transmitted at UL subframe index 4, the PHICH for it is transmitted at DL subframe index 10. To simplify this, (PUSCH, PHICH) may be expressed as (2, 8), (3, 9), or (4, 10).

The above rule applies to this. If a PUSCH is transmitted at extended UL subframe index 2 (eg, an extended UL subframe consists of subframe index {1, 2}), the PHICH for it is transmitted at DL subframe index 8. To simplify this, (second PUSCH, PHICH) may be represented as (2, 8), and (first PUSCH, PHICH) may be represented as (1, 8).

A rate matching method (hereinafter 'method M300') for the PUSCH will be described.

UpPTS may be interfered by a PRACH preamble or SRS. Accordingly, the LTE system defines a shortened PUSCH by previously defining an SRS symbol (eg, a time domain symbol for the SRS), and transmits the shortened PUSCH in an UL subframe.

This may be applied when the UL grant for only the UpPTS is transmitted and the UL grant for the extended UL subframe is transmitted.

The serving cell (or serving cell eNB) may not allocate a PUSCH to the RB through which the PRACH preamble format 4 is transmitted.

Method M310 for method M300 is a method of setting a PUSCH DM-RS symbol and an SRS symbol such that a PUSCH DM-RS symbol and an SRS symbol match. The method M310 increases the interference between the PUSCH DM-RS and the SRS, but can instead reduce the interference between the data RE and the SRS of the PUSCH. Since the SRS and the PUSCH DM-RS interfere with each other, the serving cell (or serving cell eNB) estimates UL channel state information (CSI) in consideration of this. The serving cell (or serving cell eNB) may utilize this for UL multi user (MU) -multiple input multiple output (MIMO) pairing, UL link adaptation, and the like.

Method M320 for method M300 is a method of setting a PUSCH DM-RS symbol and an SRS symbol so that the PUSCH DM-RS symbol and the SRS symbol are different from each other. The PUSCH assigned to UpPTS may interfere with the SRS in any time domain symbol. Therefore, the serving cell (or serving cell eNB) can control the interference between the PUSCH and the SRS by localizing the SRS symbols of the UEs to specific time domain symbols. For example, to increase the decoding probability of the PUSCH, PUSCH rate matching without allocating the PUSCH may be performed in the SRS symbol. However, the method M320 may be applied to UpPTS where there are not many time domain symbols including the PUSCH, and the method M320 may be applied to an extended UL subframe. When UpPTS is composed of two time domain symbols, if an SRS symbol is separately allocated within a special subframe, one time domain symbol for transmitting a PUSCH remains. Therefore, when the SRS symbol is separately allocated, the SRS symbol may be separately allocated in the normal UL subframe instead of the special subframe.

Method M330 for method M300 is a method of performing PUSCH rate matching. Since the method M320 does not allocate the PUSCH in the SRS symbol, it reduces the transmission amount of the PUSCH. The method M330 may reduce the transmission amount of the PUSCH to a relatively small amount. Accordingly, the rate matching of the PUSCH in consideration of the SRS comb may result, thereby increasing the throughput of the PUSCH. The serving cell (or serving cell eNB) may align SRS resources and perform PUSCH rate matching so that aligned SRS resources (eg, sector aligned SRS resource element) are avoided. When the serving cell (or serving cell eNB) aligns SRS resources set to different UEs, the SRS resources occur at the same time symbol and have the same subcarrier shift (or comb). UEs may be instructed through higher layer signaling. Accordingly, the serving cell (or serving cell eNB) may use a successive cancellation receiver to distinguish the already aligned SRS resources through cyclic shifts rather than through combs.

In detail, FIG. 5A illustrates a case in which the SRS symbol and the DM-RS symbol coincide with the method M310, and FIG. 5B illustrates a case where 'sector aligned SRS comb' is used by the method M330. The serving cell (or serving cell eNB) sends a 'sector aligned SRS comb' to the UE through the RRC configuration so that the SRSs collide on purpose when UEs belonging to one virtual / physical sector transmit the SRS. Can be set. SRSs collide, but because the number of REs occupied by the SRS is small, the throughput or throughput of the PUSCH can be improved.

In FIG. 5A, a method of configuring a UE to have an SRS symbol index and a DM-RS symbol index is illustrated. The serving cell (or serving cell eNB) allocates an SRS symbol having four transmission combs in one time domain symbol, and one number (eg, 0, 1, 2, 3) is a subcarrier shift (subcarrier). shift). In order to avoid interference between the SRS symbol and the PUSCH symbol, radio resource control (RRC) is set such that the PUSCH DM-RS symbol and the SRS symbol are the same. In this case, if the DM-RS symbol index is set to 3 (eg, in case of normal CP), the SRS symbol index may also be set to 3. The method illustrated in FIG. 5A does not need to separately match PUSCH for SRS.

In FIG. 5B, a method of setting transmission combs to match in an SRS symbol is illustrated. For example, if four transmission combs are not set and two of them are set, the RE corresponding to the other two transmission combs may be allocated to the PUSCH. In this case, the UE allocates a PUSCH for the corresponding transmission comb and does not allocate data for the remaining transmission combs. Therefore, the method illustrated in FIG. 5B should perform PUSCH rate matching for SRS. In the method illustrated in FIG. 5B, UL data may also be allocated in an SRS symbol, thereby increasing UL transmission or throughput.

Hereinafter, a method of avoiding a PUCCH collision when URLLC and dual connectivity scenarios are utilized will be described.

The eNB transmits signals on one or a plurality of carriers, and the UE may perform communication with the eNB in a state where reception of one or a plurality of carriers is configured.

A radio frame for performing wireless communication is composed of a plurality of subframes, and one subframe is composed of a plurality of multi-carrier symbols. Numerology applied to multi-carrier modulation is parameterized so that multiple multi-carrier symbols can coexist in one server frame.

As used herein, a transmission time interval (TTI) means a unit of a data packet capable of dynamic scheduling.

As the main scenario supported by the wireless communication system, enhanced MBB and URLLC may be considered. eMBB is a service that seeks high throughput or throughput, but URLLC is a service that seeks low latency, so one system needs a short definition of TTI to support eMBB and URLLC. Do.

As illustrated in FIG. 6A, a wireless communication system may support multiple TTIs in a single carrier operation. The wireless communication system can vary the length of the TTI by using a plurality of parameters of the multi-carrier symbol. For example, a wireless communication system may use several subcarrier spacings when considering orthogonal frequency division multiplexing (OFDM) modulation.

For example, the first TTI may be composed of N ₁ OFDM symbols (each OFDM symbol has a subcarrier spacing of 15 kHz), and the second TTI is N ₂ OFDM symbols (each OFDM symbol has a subcarrier of 60 kHz). Spaced apart). The length of the first TTI and the length of the second TTI may be different from each other. To this end, new radio (NR) supports mixed numerology.

On the other hand, as illustrated in FIG. 6B, the wireless communication system uses a multicarrier symbol having one parameter and can configure one TTI by adjusting the number of time domain symbols belonging to the TTI. For example, when the wireless communication system considers OFDM modulation, the first TTI may consist of N ₁ OFDM symbols (each OFDM symbol has a subcarrier spacing of 15 kHz), and the second TTI is N _2. OFDM symbols (each OFDM symbol has a subcarrier spacing of 15 kHz). The length of the first TTI and the length of the second TTI are different from each other. This is supported by NR and LTE Advanced pro.

In addition, the wireless communication system may use the length of the TTI through a multi-carrier operation. For example, a wireless communication system can support LTE and NR through dual connectivity. The wireless communication system may deploy LTE in a frequency range within 6 GHz and deploy NR in a frequency range around 30 GHz. In this case, LTE uses an OFDM symbol having a subcarrier spacing of 15 kHz according to the specification, but NR may use an OFDM symbol having a subcarrier spacing of 60 kHz. LTE operates based on the first TTI and NR operates based on the second TTI.

As described above, the TTI setting method is various, and the advantages of each TTI setting method are as follows.

For example, the wireless communication system may configure one DL TTI and one UL TTI. Specifically, a system in which the DL TTI and the UL TTI are the same (hereinafter, 'System1a'), a system having a longer UL TTI based on the DL TTI (hereinafter, 'System1b'), and a shorter UL TTI based on the DL TTI. A system (hereinafter 'system 1c') may be defined. System 1b can achieve UL coverage enhancement by increasing the UL TTI. System 1c can reduce UL latency by reducing UL TTI.

For another example, a wireless communication system can set one or more DL TTIs and one or more UL TTIs. Specifically, a system for setting one DL TTI and two UL TTIs (hereinafter 'System2a'), a system for setting two DL TTIs and one UL TTI (hereinafter, 'System2b') ') And a system for setting two DL TTIs and two UL TTIs (hereinafter,' system 2c ') may be defined. System 2a may use a short UL TTI to reduce UL latency and may use a long UL TTI to secure UL coverage. System 2b can conversely use short DL TTIs to reduce DL latency and long DL TTIs to secure DL coverage. System 2c can secure both latency and coverage in UL and DL.

The case where one TTI is defined may be divided into a case where the TTI is defined long and a case where the TTI is defined short, which is illustrated in Table 1 below (classification of the TTI configuration).

경우Occation	TTI 기준TTI Standard	Numerology 기준 (kHz)Numerology Standard (kHz)
1개의 numerology가 one UE에게 설정되는 경우When one numerology is set to one UE	1. (DL, UL) = (bTTI, bTTI)2. (DL, UL) = (sTTI, bTTI)3. (DL, UL) = (bTTI, sTTI)4. (DL, UL) = (sTTI, sTTI)(DL, UL) = (bTTI, bTTI) 2. (DL, UL) = (sTTI, bTTI) 3. (DL, UL) = (bTTI, sTTI) 4. (DL, UL) = (sTTI, sTTI)	5. (DL, UL) = (15, 15)6. (DL, UL) = (60, 15)7. (DL, UL) = (15, 60)8. (DL, UL) = (60, 60)5. (DL, UL) = (15, 15) 6. (DL, UL) = (60, 15) 7. (DL, UL) = (15, 60) 8. (DL, UL) = (60, 60)
2개의 numerology 가 one UE에게 설정되는 경우2 numerology is set to one UE	9. (DL, UL) = (sTTI&bTTI, bTTI)10. (DL, UL) = (sTTI&bTTI, sTTI)11. (DL, UL) = (bTTI, sTTI&bTTI)12. (DL, UL) = (sTTI, sTTI&bTTI)13. (DL, UL) = (sTTI, bTTI) & (bTTI, sTTI)14. (DL, UL) = (sTTI, sTTI) & (bTTI, bTTI)9. (DL, UL) = (sTTI & bTTI, bTTI) 10. (DL, UL) = (sTTI & bTTI, sTTI) 11. (DL, UL) = (bTTI, sTTI & bTTI) 12. (DL, UL) = (sTTI, sTTI & bTTI) 13. (DL, UL) = (sTTI, bTTI) & (bTTI, sTTI) 14. (DL, UL) = (sTTI, sTTI) & (bTTI, bTTI)	15. (DL, UL) = (15&60, 15)16. (DL, UL) = (15&60, 60)17. (DL, UL) = (15, 15&60)18. (DL, UL) = (60, 15&60)19. (DL, UL) = (60, 15) & (15, 60)20. (DL, UL) = (15, 15) & (60, 60)15. (DL, UL) = (15 & 60, 15) 16. (DL, UL) = (15 & 60, 60) 17. (DL, UL) = (15, 15 & 60) 18. (DL, UL) = (60, 15 & 60) 19. (DL, UL) = (60, 15) & (15, 60) 20. (DL, UL) = (15, 15) & (60, 60)

In Table 1, bTTI means relatively long TTI, and sTTI means relatively short TTI. In Table 1, the subcarrier spacing of 15 kHz and the subcarrier spacing of 60 kHz are compared with each other in the case of different numerology, but this is only an example, and in Table 1, 15 kHz and 60 kHz may be replaced by any two numbers. In this case, the TTI composed of 15 kHz OFDM symbols is relatively long and the TTI composed of 60 kHz OFDM symbols is relatively short. As another example, a 30 kHz subcarrier spacing may be used to construct a relatively long TTI, and a 60 kHz subcarrier spacing may be used to form a relatively short TTI.

Of the 20 cases (case 1 to case 20) illustrated in Table 1, in case 11 and case 17, a collision expected by the UE occurs. Specifically, since the period of DL control is determined based on the bTTI and the UL data is granted based on the sTTI, the UE can anticipate a collision.

On the other hand, in Case 12 and Case 18, collisions that are not expected by the UE may occur. Specifically, since the period of DL control is determined based on the sTTI, the UL data may be transmitted based on the sTTI while the UE transmits the UL data based on the bTTI.

That is, when the period of the DL control channel and the period of the UL control channel are different from each other, a transmission overlap that the UE does not expect in advance occurs. The transmission overlap that the UE does not anticipate in advance is independent of the number of multicarrier symbols and the used numerology.

In the case of a system that operates DL scheduling assignments based on two cycles in a DL control channel, the specification may be implemented by the UE for implementing complexity (e.g., receiving two or more DL controls and handling overlap of data transmissions). Implementation complexity) can be used.

A system operating two UL scheduling grants in a DL control channel may have to send another UL data while transmitting UL data. Cases related to this can be summarized as shown in Table 1. For example, when bPUSCH and one or more sPUSCHs are transmitted (case a1), when bPUSCH and one or more sPUCCHs are transmitted (case a2), when bPUCCH and one or more sPUSCHs are transmitted (case a3), and bPUCCH and one There may be a case of transmitting more than sPUCCH (case a4). In the present specification, PUXCH means PUCCH or PUSCH, and sPUXCH (short PUXCH) is shorter than bPUXCH (base PUXCH).

7A and 7B are diagrams illustrating collision of a PUCCH.

Specifically, FIG. 7A illustrates a collision between bPUCCH and sPUCCH in FDD, and FIG. 7B illustrates a collision between bPUCCH and sPUCCH in TDD.

As illustrated in FIG. 7A, the UE transmits uplink data for base subframe 4 indicated by base serving subframe 0 by the serving cell (or serving cell eNB) based on bTTI. The UE transmits uplink data for

short subframes

5 and 7 indicated by the serving cell (or serving cell eNB) in

short subframes

1 and 3 based on the sTTI. In this case, since uplink data transmission of the UE overlaps with each other in the base subframe 4 and the

short subframes

5 and 7, a standard for avoiding this is necessary.

On the other hand, as illustrated in FIG. 7B, the system operates in DL before GP and in UL after GP. The serving cell (or serving cell eNB) may instruct the UE to transmit data based on the bTTI in base subframe A, and the serving cell (or serving cell eNB) may sTTI in subframes a and c where the UE is short. Can be instructed to transmit data based on the < RTI ID = 0.0 > In this case, since uplink data transmission of the UE overlaps with each other in the base subframe A and the short subframes a and c, a standard for avoiding this is necessary.

Hereinafter, a method (eg, method P300, method P400, method P500, etc.) for solving this problem will be described.

Method P300 is a method in which the UE feeds back sPUCCH or sPUSCH with the base HARQ-ACK.

The method P400 is a method in which the UE feeds back with the sPUCCH without delaying the bPUCCH. Since the sPUCCH has a latency requirement, the UE should be able to transmit the sPUCCH preferentially, but the indication of the transmission of the sPUCCH after the time when the UE encodes uplink control information (UCI) for the bPUCCH May occur. As such, the method P400 may be used to consider the case where the UE does not reflect UCI for sPUCCH while performing bPUCCH encoding and encodes only UCI for bPUCCH.

The method P300 configures the UE to multiplex bPUCCH on the basis of the sPUCCH. Specifically, when the UE needs to transmit the sPUCCH (or sPUSCH) based on the uplink sTTI, the base HARQ-ACK may be multiplexed on the sPUCCH (or sPUSCH).

Method P310 for method P300 is a resource selection method with respect to base HARQ-ACK bits.

The serving cell (or serving cell eNb) may configure a resource set to the UE through higher layer signaling. The resource set includes a plurality of resources, and the UE may dynamically select one of the resources included in the resource set to transmit uplink data or uplink control on the selected resource. The selection metric of the UE may be based on the base HARQ-ACK bit. The serving cell (or serving cell eNB) can estimate which resource the UE has selected and detect the base HARQ-ACK.

The range defined by the resource includes at least a sequence index, a cyclic shift (CS), and an OCC, and includes a time resource and a frequency resource. The time resource may represent a transmission timing in a subframe or slot unit and may be represented by a symbol index. The frequency resource may be expressed in subband units or in RB units.

The range of resource configuration includes DM-RS sequence generation information, RB index, etc. in the case of sPUCCH. The range of resource configuration includes at least RB assignments in the case of sPUSCH.

For example, if the base HARQ-ACK has a maximum of n bits, such as [b ₀ , b ₁ , ..., b _n _-1 ], the serving cell (or serving cell eNB) is previously 2 ⁿ uplinks. The link resource may be configured for the UE through a higher layer configuration.

8 is a diagram illustrating a method of multiplexing a base HARQ-ACK to an sPUCCH or an sPUSCH according to an embodiment of the present invention. In FIG. 8, the case where n is 2 is illustrated. In FIG. 8, the serving cell (or serving cell eNB) performs 2 ² resource configuration (eg, resource configuration 1 to 4) for the UE. If the base HARQ-ACK multiplexed on the sPUXCH is (b ₀ , b ₁ ), the UE selects one resource from four resources and uses the selected resource as a resource of the sPUXCH.

This UE operation is similar to a method of indicating PDSCH RE mapping through a PDSCH rate matching and QuasiCoLocation indicator (PQI) field in LTE transmission mode 10. The UE operation is similar to the 'PUCCH format 1b with channel selection' method in LTE carrier aggregation. 8 illustrates a case where sPUSCH is transmitted and a case where sPUCCH is transmitted when n = 2.

This method can be applied when the number of bits of the base HARQ-ACK is small. If there is a carrier aggregation operation for the base TTI, this method is not efficient because n is large.

The method P320 for the method for the method P300 is a method in which the UE drops a bPUXCH and instead transmits an sPUXCH, and then the UE transmits a bPUXCH in the next bTTI that can be transmitted.

The method P320 may be applied when the URLLC PUXCH of the eMBB PUXCH and the URLLC PUXCH has a priority and the eMBB PUXCH is dropped or delayed. The LTE system may also prioritize the transmission of the sTTI and delay the transmission of the bTTI. In this case, scheduling for next bTTI may overlap.

There may be a case in which the serving cell (or serving cell eNB) sequentially allocates bPDSCH to the corresponding UE so that the UE sequentially transmits bPUCCH. As such, a case may be considered in which a bPUCCH is dropped in the current bTTI and an sTTI is transmitted instead. Similarly, even if the serving cell (or serving cell eNB) causes the UE to transmit bPUSCHs in succession, the bPUSCH may be dropped from the current bTTI and sTTI may be transmitted instead. In addition, even when the serving cell (or serving cell eNB) instructs the UE to transmit bPUXCH consecutively without distinguishing bPUSCH or bPUCCH, the bPUXCH may be dropped from the current bTTI and sTTI may be transmitted instead.

This method is inefficient in terms of throughput of the eMBB since the bTTI may not continue to be transmitted when the sTTI is set periodically.

If a bPUSCH or bPUCCH is also scheduled for the next bTTI, the UE is to send on the next bTTI, the bPUSCH to drop on the current bTTI (or bPUCCH) and on the next bTTI. (Or bPUCCH) can be multiplexed.

If the bPUSCH dropped in the current bTTI is multiplexed with the bPUSCH in the next bTTI (first case), it is difficult for the UE to send all of the bPUSCHs without a separate instruction from the eNB. Since the PUSCH TPC of the current bTTI, the PUSCH DM-RS cyclic shift, and the number of layers are different from each other, the PUSCH TPC of the next bTTI, the PUSCH DM-RS cyclic shift, and the number of layers are generally different. Spatial multiplexing or frequency multiplexing two bPUSCHs is difficult. Therefore, the UE does not perform a separate operation for the bPUSCH dropped in the current bTTI.

If the bPUSCH dropped in the current bTTI is multiplexed with the bPUCCH in the next bTTI (second case), the payload of the HARQ-ACK transmitted by the UE through the bPUCCH is 1 to 2 bits, etc. Under the assumption that it is small, 'PUCCH format 1b with channel selection' method (eg, method P310) may be used. A resource of a bPUSCH is selected according to a combination of HARQ-ACKs transmitted through a bPUCCH allocated in a next bTTI, and a UE may transmit a bPUSCH in a next bTTI using the selected resource. The serving cell (or serving cell eNB) may detect the bHARQ-ACK through blind detection. The UE may reuse the information of the UL-related DCI received from the serving cell (or serving cell eNB) to transmit allocation information of the bPUSCH in the current bTTI. On the other hand, when the payload of HARQ-ACK transmitted in the next bTTI is large, this method is not used because the combination of HARQ-ACK grows exponentially. As a method that can be used regardless of the payload of the HARQ-ACK, when the 'simultaneous PUSCH and PUCCH' is configured for the UE, the UE transmits the PUSCH and the PUCCH in the next bTTI. To support this method, the UE can reuse information of UL-related DCI for allocation of PUSCH transmitted in current bTTI.

If the bPUCCH dropped in the current bTTI is multiplexed with the bPUSCH in the next bTTI (third case), under the assumption that the number of HARQ-ACK bits transmitted in the current bTTI is not large. The UE may select a resource of a bPUSCH to be transmitted in a next bTTI according to a combination of HARQ-ACKs dropped. After the serving cell (or serving cell eNB) sets such a set of bPUSCH resources to the UE through RRC, the serving cell (or serving cell eNB) detects the resources of the bPUSCH received at the next bTTI from the UE through blind detection, thereby performing HARQ. The bit of the -ACK can be estimated. On the other hand, this method does not apply when the payload of HARQ-ACK is large. As a method that can be used regardless of the payload of the HARQ-ACK, when the 'simultaneous PUSCH and PUCCH' is configured for the UE, the UE transmits the PUSCH and the PUCCH in the next bTTI.

If the bPUCCH dropped in the current bTTI is multiplexed with the bPUCCH in the next bTTI (fourth case), the LTE carrier aggregation method or the LTE HARQ-ACK bundling (or multiplexing) method may be used. . For example, a method using 'PUCCH format 1b with channel selection', a method of converting a PUCCH format from format 1a to format 1b, or encoding a channel through payloads of PUCCH formats 3, 4, and 5 There is a way to redo the RE mapping. This corresponds to a method of adaptively converting a PUCCH format and a method of performing channel encoding and RE mapping by controlling the number of HARQ-ACK bits in the same PUCCH format.

If the full payload of the HARQ-ACK to be transmitted in the next bTTI is passed over a specific PUCCH format, another PUCCH format may be used. For example, although the PUCCH format to be transmitted in the next bTTI was format 3, a scheme of transmitting through format 4 may be allowed because there are many HARQ-ACK bits transferred from the current bTTI.

9A, 9B, and 9C are diagrams illustrating RE mapping of sPUXCH and bPUSCH according to an embodiment of the present invention. Specifically, RE mapping of bPUSCH is illustrated in FIG. 9A, RE mapping of sTTI and bPUSCH is illustrated in FIG. 9B, and RE mapping of sTTI and 'bPUSCH with CSI' is illustrated in FIG. 9C.

9A, 9B, and 9C, the horizontal axis is the time axis (eg, slot) and the vertical axis is the frequency axis (eg, PRB).

Method P330 for Method P300 is a method for the UE puncturing a base PUSCH and transmitting an sPUXCH.

According to the method P330, when there is an sTTI to which the sPUXCH should be transmitted by the UE, the UE does not transmit a bPUSCH in time domain symbols belonging to the sTTI. However, the time domain symbols excluded from this case (ie, when the UE does not transmit bPUSCH in time domain symbols belonging to the sTTI) include the DM-RS of the bPUSCH, as illustrated in FIG. 9B, and the UE Does not puncture the DM-RS of the bPUSCH even when transmitting the sPUXCH.

In addition, as illustrated in FIG. 9C, a UE uses a CSI element (eg, a CSI-RS resource indication (CRI), a rank indication (RI), a pre-coding matrix indication (PMI), a channel quality indication (CQI, etc.)) in a bPUSCH. Even when multiplexing and base HARQ-ACK, the UE does not puncture these CSI elements while transmitting the sPUXCH.

Since this method reduces the bPUXCH decoding performance of the serving cell (or serving cell eNB), a retransmission procedure may be required. In the case of a bPUSCH, the UE may retransmit the bPUSCH on an LTE PHICH or other UL grant. On the other hand, in the case of bPUCCH, this method may not be used because there is no retransmission procedure even if the serving cell (or serving cell eNB) fails to decode. The serving cell (or serving cell eNB) may regard this case as a discontinuous transmission (DTx) of the bPDSCH and may transmit the bPDSCH through a DL assignment.

Method P340 for Method P300 is a method for the UE to rate match bPUSCH and transmit sPUXCH.

According to the method P340, when there is an sTTI to which the sPUXCH should be transmitted by the UE, the UE does not transmit a bPUSCH in time domain symbols belonging to the sTTI. However, the time domain symbols excluded from this case (ie, when the UE does not transmit bPUSCH in time domain symbols belonging to the sTTI) include the DM-RS of the bPUSCH, as illustrated in FIG. 9B, and the UE Does not puncture the DM-RS of the bPUSCH.

In addition, as illustrated in FIG. 9C, even when a UE multiplexes a CSI element (eg, CRI, RI, PMI, CQI, etc.) and a base HARQ-ACK in a bPUSCH, the UE transmits these sPUXCHs and transmits these CSI elements. Do not treat.

In order to increase the decoding performance of the bPUSCH, the UE performs a rate matching of the bPUSCH on the remaining resources except for the sTTI resource among the granted resources. This may be applied even when the serving cell (or serving cell eNB) does not predict the transmission of the sPUXCH in advance. The serving cell (or serving cell eNB) cannot predict the transmission of the sPUXCH in advance, so that the serving cell (or serving cell eNB) is satisfied so that the target BLER (e.g., 10%) is satisfied when the bPUSCH is transmitted by the UE in the granted resource. UL grant may determine the RB allocation and the MCS of the bPUSCH. However, sTTI resources are excluded from the transmission resources (transmission resources for bPUSCH) that the UE knows from the UL grant of the bPUSCH received from the serving cell (or serving cell eNB), which the serving cell (or serving cell eNB) predicts in advance. There is a case where it is impossible to successfully decode the bPUSCH because it cannot. In this case, the serving cell (or serving cell eNB) should instruct the UE to retransmit the corresponding bPUSCH. However, in the remaining resources (or time domain symbols) except for the sTTI resource among the bTTI resources, the UE may perform bPUSCH RE mapping using the granted RB assignment and the MCS.

The method P400 configures the UE to multiplex sPUCCH on the basis of bPUCCH.

In LTE, five PUCCH formats are defined. This PUCCH format is used for CQI reporting or HARQ-ACK reporting.

Meanwhile, for the NR PUCCH format, the following methods (eg, method P410, etc.) may be considered.

Method P410 for Method P400 is a symbol-level differential encoding method.

First, the PUCCH format 1b will be described as an example.

10A and 10B illustrate a resource block (PRB) of PUCCH format 1, 1a, or 1b according to an embodiment of the present invention. Specifically, FIG. 10A illustrates a case of a normal cyclic prefix (CP), and FIG. 10B illustrates a case of an extended CP. When a shortened PUCCH format is transmitted in an even PRB, the last time domain symbol of a slot is punctured. This applies equally or similarly to FIGS. 9A to 9C, 10A to 10B, 11A to 11B, 12A to 12B, and 13A to 13B.

LTE PUCCH format 1b and normal CP will be described as an example.

Resources for LTE PUCCH format 1b include a payload RE and a DM-RS RE. In the case of a normal CP (NCP), one slot includes seven time domain symbols (eg, single carrier (SC) -frequency division multiple access (FDMA) symbols). The DM-RS is mapped to three time domain symbols among seven time domain symbols belonging to one slot, and the payload is mapped to the remaining four time domain symbols.

In the case of an extended CP (ECP), one slot includes six time domain symbols (e.g., SC-FDMA symbols). The DM-RS is mapped to two time domain symbols among six time domain symbols belonging to one slot, and the payload is mapped to the remaining four time domain symbols.

Therefore, channel encoding applies equally to NCP and ECP. According to TS 36.211, PUCCH format 1a encodes 1 bit HARQ-ACK, and PUCCH format 1b encodes 2 bits HARQ-ACK. Since HARQ-ACK is represented by 1 bit or 2 bits, HARQ-ACK is transmitted to PUCCH payload RE through time spreading and frequency spreading for one quadrature phase shift keying (QPSK) symbol. ACK is mapped.

Meanwhile, in order to transmit the HARQ-ACK for the PDSCH using the short TTI, differential encoding may be applied to the PUCCH payload RE. In the following, it is assumed that the sTTI consists of two time domain symbols (eg, SC-FDMA symbols). In the following description, a base HARQ-ACK bit included in slot 0 and slot 1 is represented by [b ₀ , b ₁ ], and a short HARQ-ACK bit included in slot 0 and slot 1 is represented by [s ₀ , s ₁ ].

As illustrated in FIG. 10A, of the seven time domain symbols included in slot 0, the first two time domain symbols are mapped through channel coding based on [b ₀ , b ₁ ], but the seven time domains included in slot 0 The latter two time domain symbols among the domain symbols may be mapped through channel coding based on [b ₀ + s ₀ , b ₁ + s ₁ ]. Here, + means phase encoding.

For convenience of explanation,

(Complex) is expressed in bHARQ bits,

May be expressed as sHARQ bits. Since the encoding process of PUCCH format 1b assumes frequency domain spreading using a sequence, the encoding process of PUCCH format 1b is

It can be expressed as a (vector). Where (f _gh (n _s ) + f _ss ) is a UE-specific pseudo-random value, belongs to {0, ..., 29}, and r () is used by the UE The resulting sequence is expressed in the form of a vector.

Where f _gh Means a group-hopping pattern, and the formula

Given by f _gh Is initialized for each radio frame based on bTTI.

It is expressed as

Is a number determined by the serving cell (or serving cell eNB) for the UE,

Has the same range as n _s denotes the slot index on the basis of base TTI, and f _ss refers to the movement pattern sequence (sequence-shift pattern).

The cyclic shift can be calculated by dividing into a cell-specific cyclic shift and a UE-specific cyclic shift. The calculation of the cyclic shift is essentially performed for interference randomization, but the calculation method and parameters thereof may follow the method defined in the specification of LTE advanced pro.

The UE selects the t th time domain symbol (e.g., an SC-FDMA symbol).

Where the (t + 1) th time domain silbol (e.g. SC-FDMA symbol)

Can be expressed as The serving cell (or serving cell eNB) receives this and performs de-spreading

Detect The serving cell (or serving cell eNB)

Can detect [s ₀ , s ₁ ].

This approach can be applied even if two UEs are assumed. Where UEs

or

This is at least different. UE1 sends b at next symbol

Is transmitted, and UE2 transmits c at the next symbol.

In this case, the case of transmitting a packet may be considered.

In this case, the payload sent by UE1 is

Corresponding to the payload transmitted by UE2,

Corresponds to

Thus, the signal received by the serving cell (or serving cell eNB) is

Corresponds to h ₁ means the effective channel response after UE1 combines the receiving antenna (s) of the serving cell (or serving cell eNB). h ₂ means an effective channel response after UE2 combines the receiving antenna (s) of the serving cell (or serving cell eNB). Z means noise obtained at the receiving antenna of the serving cell (or serving cell eNB). here,

How to recover. ο operation means element-wise multiplication, and * operation means complex conjugate.

Since the UE-specific spreading sequence is used,

and

This can be used approximately.

therefore,

And

Can be obtained.

r () means a sequence used by UE1, and s () means a sequence used by UE2. y () means a row vector of a signal received by the serving cell (or serving cell eNB). z () denotes noise received at a receiving antenna of a serving cell (or serving cell eNB). b means a HARQ-ACK bit to be transmitted by the UE1, 1 means a row vector consisting of one. z '() and z' '() refer to noise obtained after the sequence used by UE1 is de-spreaded.

The value of

Can be calculated from Through this, a method of transmitting 2 bits belonging to a short HARQ-ACK even in inter-UE interference has been described.

The above operation relates to the mapping for one time domain symbol (eg, SC-FDMA symbol). A method of performing differential encoding on each of at least one time domain symbol belonging to a short TTI is a serving cell (or serving cell) by combining results obtained from more time domain symbols. detection probability in an eNB) can be increased.

If the UE wants to transmit a plurality of short HARQ-ACKs on the base PUCCH, this operation may be repeated to perform time division multiplexing (TDM). Through this, the UE may transmit a short HARQ-ACK while maintaining the performance (eg, detection probability, latency requirement, etc.) of the base HARQ-ACK.

In addition, since the UE can transmit a short HARQ-ACK while minimizing a change in the bPUCCH for the base HARQ-ACK, the complexity is low.

The above description corresponds to a method for distinguishing between ACK and NACK of a short PUCCH. In the case of DTx (eg, when the UE has not received a DCI specifying the PDSCH based on the short TTI), the following method may be applied.

Method P411 for Method P410 is a 'DTx-indication in phase modulation' method using phase modulation.

For LTE PUCCH format 1b

For generation of (vector), phase modulation is applied to the base sequence.

ego,

ego,

Is a function of cell-specific and UE-specific parameters,

Denotes the number of subcarriers constituting one PRB (eg, 12), n _s denotes a slot index based on a base TTI, and l denotes an index of a time domain symbol. An integer multiple of this cyclic shift is applied to the sequence element index.

.

If there is no short HARQ-ACK, the serving cell (or serving cell eNB) transmits only the base TTI to the UE through PDSCH, or the UE cannot receive DCI for short TTI. This is the case with DTx. In this case, the phase generation method of the LTE PUCCH format is applied as it is.

On the other hand, if there is a short HARQ-ACK, whether the signal of the UE is NACK or ACK should be explicitly expressed. To do this, change the sign of the cyclic shift (e.g.

) Can be used. The UE applies this integer multiple of the cyclic shift to the sequence element index. In other words,

.

Alternatively, or alternatively, the serving cell (or serving cell eNB) may assign a number of cyclic shift values to the UE, and the UE selects a specific cyclic shift value among the plurality of cyclic shift values in the case of ACK, and NACK In this case, another specific cyclic shift value may be selected, and the selected cyclic shift value may be applied to the sequence element index.

The serving cell (or serving cell eNB) detects the sequence element (or frequency domain spreading sequence) through blind detection to first determine whether the UE corresponds to DTx. If the serving cell (or serving cell eNB) determines that the corresponding UE does not correspond to DTx, the serving cell (or serving cell eNB) determines whether the signal of the UE is ACK or NACK using method P410.

Method P412 for Method P410 is a 'DTx-indication in sequence index domain' method that uses a sequence index.

A base sequence used for the LTE PUCCH (base sequence) index is determined based on the hopping group (f _gh (n _s)) and the shift sequence (f _ss). The sequence index used for DM-RS and the sequence index used for payload are the same. If sTTI (or subslot m _s ) is introduced, this sequence index can be generated at m _s . Thus, in case of a non-DTx in which the UE should transmit a short HARQ-ACK, the sequence index used for the corresponding subslot is different from the sequence index used for the base HARQ-ACK. The serving cell (or serving cell eNB) detects the sequence index through blind detection to first determine whether the UE corresponds to DTx. When the serving cell (or serving cell eNB) determines that the UE does not correspond to DTx, the serving cell (or serving cell eNB) determines whether the signal of the UE is ACK or NACK using method P410.

Next, PUCCH format 3 will be described as an example.

LTE PUCCH format 3 also undergoes encoding similar to PUCCH format 1b, but LTE PUCCH format 3 considers time domain spreading and does not consider frequency domain spreading. Symbol-level differential encoding for PUCCH format 3 may be performed similarly to symbol level differential encoding for PUCCH format 1b. However, since PUCCH format 3 does not consider frequency domain spreading, inter-UE interference occurs, and interference experienced by a serving cell (or serving cell eNB) in a time domain symbol period in which PUCCH format 3 is received. If the amount of is changed, the reception performance of PUCCH format 3 of the serving cell (or serving cell eNB) is reduced.

11A and 11B illustrate a resource block (PRB) of LTE PUCCH format 3 according to an embodiment of the present invention. In detail, a case of a normal CP is illustrated in FIG. 11A, and a case of an extended CP is illustrated in FIG. 11B.

If the slot index to which the PRB belongs is odd (eg, slot 1) and a shortened format is defined for simultaneous transmission with the SRS, the last time domain symbol is not transmitted. This applies equally or similarly to FIGS. 9A to 9C, 10A to 10B, 11A to 11B, 12A to 12B, and 13A to 13B.

The value of RE with LTE PUCCH format 3

P denotes the logical index of the antenna port (e.g., 0, 1, 2, 3, etc.), n denotes the index of a time domain symbol (e.g., SC-FDMA symbol), and i denotes the subcarrier index. Indicates. N ₀ corresponds to 5 in the case of

normal PUCCH format

3 and 4 in the case of shorted PUCCH format 3. d (i) means an encoded HARQ-ACK bit.

n _cs () denotes a cyclic shift, and c () denotes a pseudo-random sequence used in LTE. N _symb corresponds to 7 in the case of a normal CP and 6 in the case of an extended CP.

Wow

Is a time domain orthogonal sequence, corresponds to a discrete Fourier transform (DFT) sequence of length 5 in the case of normal PUCCH format 3, and is a shortened PUCCH format 3 Corresponds to a length-4 DFT sequence.

Method according to an embodiment of the present invention

In order to make the subcarrier index i change UE-specifically, m _cs (n _s , l) is added to form a cyclic shift. Through this, an effect of frequency domain spreading can be obtained, and coping with inter-cell interference can be achieved.

Since N _cs = 0 when a mixed format is not considered, m _cs (n _s , l) may be obtained through normalization of UE-specific values. According to the LTE PUCCH format 1b, m _cs (n _s , l) may be obtained as in the following equation.

Here, the serving cell (or serving cell eNB) sets Δ to the UE through higher layer configuration, and Δ has a value of 1, 2, and 3. c is 2 for normal CP and 1 for extended CP.

Here, the serving cell (or serving cell eNB) sets n ⁽ ^{3, p} ⁾ to the UE through a higher layer configuration. Here, c means the number of DM-RS symbols used for PUCCH format 3.

Method P420 for Method P400 is a PUCCH rate matching method.

In contrast to the case where the above-described base PUCCH is spread, the case where the base PUCCH is not spread may be considered. In this case, for short HARQ-ACK to be transmitted, multiplexing of channel coding or resource mapping cannot be considered, and multiplexing of short PUCCH can be considered.

PUCCH format 4 will be described as an example.

For example, LTE PUCCH format 4 has a form of PUSCH. A spreading factor is used as 1 and at least one RB may be used according to the RRC configuration. Accordingly, the serving cell (or serving cell eNB) may set more frequency resources of PUCCH format 4 for multiplexing short PUCCH resources. As a method of notifying the UE of this setting, when the serving cell (or serving cell eNB) utilizes multiple TTIs to serve eMBB, URLLC, and the like, the transmission mode setting and the report setting may be used.

This method is illustrated in FIGS. 12A and 12B.

12A and 12B illustrate slots of the LTE PUCCH format 4 when a normal CP is used according to an embodiment of the present invention. In detail, FIG. 12A illustrates a base PUCCH slot, and FIG. 12B illustrates a slot in which a base PUCCH and a short PUCCH are multiplexed.

12A and 12B, the horizontal axis is the time axis (eg, slot) and the vertical axis is the frequency axis (eg, configured bandwidth).

The base HARQ-ACK uses PUCCH format 4. Since two short HARQ-ACKs occur, two short PUCCHs corresponding thereto are illustrated in FIG. 12B.

12A and 12B illustrate a case in which a DM-RS is mapped to a fourth time domain among seven time domain symbols (eg, SC-FDMA symbols) included in a slot.

It is assumed that a short PUCCH is set so that the detection probability and false alarm probability required by the serving cell (or serving cell eNB) are satisfied through encoding and spreading of HARQ-ACK.

For short PUCCH, channel coding such as Reed Muller code, tail-biting convolutional code (TBCC), turbo, polar, or the like may be applied.

As illustrated in FIGS. 12A and 12B, this short PUCCH may be transmitted alone by the UE or may be transmitted multiplexed with the base PUCCH. For each of these cases, the short PUCCH may have a different channel encoding scheme and code rate (and RE mapping) than the base PUCCH.

As illustrated in FIGS. 12A and 12, the base PUCCH and the short PUCCH share a DM-RS. In order to utilize frequency diversity, RE mapping using a plurality of non-contiguous subcarriers is performed on a short PUCCH.

For the base PUCCH, the RE that the short PUCCH can use is emptied, PUCCH rate matching is performed, and RE mapping is performed.

In order to secure the detection probability of the short PUCCH, the UE may perform transmission power control for each time domain symbol (eg, SC-FDMA symbol). In this case, the serving cell (or serving cell eNB) may deliver the power offset that the UE should use to the UE via higher layer signaling or physical layer signaling.

Method P430 for Method P400 is an OCC selection method.

The base PUCCH may spread adjacent payload REs through the OCC. In this case, the serving cell (or serving cell eNB) sets up several OCC sets to the UE, and the UE uses different OCCs according to the HARQ-ACK bit for the short PUCCH. The eNB may transmit the HARQ-ACK bit for the short PUCCH. This approach does not orthogonalize inter-UE interference with OCC and instead dedicates OCC to payload multiplexing, resulting in less UE multiplexing capability.

PUCCH format 5 will be described as an example.

The serving cell (or serving cell eNB) configures the OCC-2 (length 2 OCC) used by the UE to the UE through higher layer signaling. PUCCH format 5 spreads one encoded PUCCH RE into two in the frequency domain with one DM-RS symbol.

13A and 13B illustrate slots of an LTE PUCCH format 5 when a normal CP is used according to an embodiment of the present invention. Specifically, FIG. 13A illustrates a base PUCCH slot, and FIG. 13B illustrates a slot in which a base PUCCH and a short PUCCH are multiplexed. Only base PUCCH is illustrated in FIG. 13A, and an RE pair to which an OCC is applied is illustrated in FIG. 13B. Assume that there are two short TTIs.

If the serving cell (or serving cell eNB) does not set the OCC-2 to the UE, the UE may determine the OCC-2 dynamically. In this case, the UE applies frequency domain spreading to [+1, +1] or frequency domain spreading to [+1, -1] according to the HARQ-ACK bit for short PUCCH. can do. Since there are six such sets of subcarriers, the detection performance of the HARQ-ACK bit for the short PUCCH can be maintained as high as possible. In TS 36.211, n _oc is set to the UE through higher layer signaling. However, in the method according to the embodiment of the present invention, the UE determines n _oc indicating the index of OCC-2, and the serving cell (or serving cell eNB) detects n _oc through blind detection so that n _oc = It can be determined whether it is 0 or 1.

This method may be applied to intra-cell inter-UE interference, but has a disadvantage of being susceptible to inter-cell inter-UE interference. To solve this problem, a method of increasing the frequency domain spreading factor may be used. In this way, the standard can further define the frequency domain OCC. The UE may select the frequency domain OCC according to a combination of HARQ-ACK bit (s) for a short PUCCH. The UE may generate a base PUCCH format to which the selected OCC is applied and indirectly transmit a HARQ-ACK bit for a short PUCCH to a serving cell (or serving cell eNB).

Method P500 is a puncturing method.

The method P500 does not transmit a bPUCCH in a specific UL subslot among UL symbols in which a bPUCCH is transmitted but instead transmits an sPUCCH. This method is illustrated in FIGS. 14A and 14B. 14B illustrates a case where a subslot includes two time domain symbols.

14A and 14B illustrate puncturing of short PUCCH according to an embodiment of the present invention. Specifically, FIG. 14A illustrates 'bPUCCH puncturing with DM-RS sharing' for sharing the DM-RS, and FIG. 14B illustrates 'bPUCCH puncturing with separate DM-RS' for not sharing the DM-RS.

The method P330 confines the puncturing pattern or rate matching to specific time domain symbols and specific subcarriers, but the method P500 applies the puncturing pattern to all subcarriers belonging to a specific time domain symbol.

14A and 14B, for convenience of description, it is assumed that the RE mapping of the LTE PUCCH format 1b indicating an arbitrary base PUCCH. FIG. 14A illustrates a case in which a sPUCCH and a bPUCCH share a DM-RS. 14B illustrates a case in which the sPUCCH and bPUCCH do not share the DM-RS.

When the sPUCCH is shared with the bPUCCH without puncturing the DM-RS of the bPUCCH (eg, FIG. 14A), since the number of DM-RS symbols or DM-RS REs is sufficient, the payload of the corresponding base PUCCH is transmitted. Channel estimation for bandwidth and time domain symbols can be performed correctly.

On the other hand, when the sPUCCH and bPUCCH do not share the DM-RS (eg, FIG. 14B), a separate DM-RS for the sPUCCH should be allocated. Since sPUCCH and bPUCCH generally have different frequency resources (eg f ₁ , f ₂ ), in this case, sPUCCH and bPUCCH cannot share DM-RS with each other. Accordingly, the number of DM-RS symbols or DM-RS REs that the serving cell (or serving cell eNB) receiving the sPUCCH or bPUCCH to use for channel estimation is relatively reduced. Therefore, in order for the sPUCCH sharing the DM-RS to replace the bPUCCH in the form illustrated in FIG. 14A, puncturing may be performed.

In the case of LTE, the format 1 PUCCH resource index (e.g. n) is a value of a higher layer configured parameter (e.g. n ⁽¹⁾ ) and a dynamically signaled parameter (e.g. n _CCE ). Defined as a function (eg n = n ⁽¹⁾ + n _CCE ). If the same mechanism is applied to the NR, the frequency resource for the UE to transmit the sPUCCH is different according to the value determined by the sPDCCH. In the present specification, PDXCH means PDCCH or PDSCH. Short PDXCH (sPDXCH) may be transmitted in a relatively large number of time domain symbols and may be transmitted in a longer time interval than bPDXCH (base PDXCH). Alternatively, sPDXCH (short PDXCH) has a lower subcarrier spacing than bPDXCH (base PDXCH), but may be transmitted in the same number of time domain symbols and may be transmitted in a longer time interval.

As described above, since the UE separately transmits the DM-RS for transmitting the sPUCCH, the number of time domain symbols punctured in the bPUCCH increases to further consider the DM-RS for the sPUCCH, or vice versa. The number of time domain symbols occupied by the payload of is reduced. In the case where the sPUCCH and bPUCCH share the DM-RS, this disadvantage can be solved.

In this case, both the bPUCCH and the sPUCCH must be located in the frequency resource occupied by the DM-RS so that the serving cell (or serving cell eNB) can perform demodulation. In order to transmit the sPUCCH that occurs abruptly while the UE transmits the bPUCCH, a dynamically signaled parameter used in the sPUCCH resource index may be derived from the bPDCCH rather than the sPDCCH. .

Hereinafter, a case in which sPUCCH and bPUCCH share DM-RS will be described in detail.

The format 1b is taken as an example.

Hereinafter, for convenience of description, the base HARQ-ACK transmitted by the bPUCCH

HARQ-ACK symbol for a short PUCCH

It is called. Each complex number corresponds to 2 bits. When the bPUCCH has a form of the LTE PUCCH format 1b, it has three DM-RS symbols and four payload symbols (eg, time domain symbols for payload). Thus, if only bPUCCH is present and no sPUCCH is present, the UE spreads [d ₀ , d ₀ , d ₀ , d ₀ ] in each UL symbol, respectively, as in LTE. If the UE needs to transmit the HARQ-ACK bit using the sPUCCH, the UE should allocate at least one UL symbol to the HARQ-ACK bit for the bPUCCH in order to transmit the HARQ-ACK bit for the bPUCCH as well. Therefore, the UE can transmit up to three HARQ-ACK symbols (or up to six HARQ-ACK bits) to be transmitted on the sPUCCH within one PRB constituting the bPUCCH.

Four HARQ-ACK symbols that a UE intends to transmit through sPUCCH within one PRB constituting bPUCCH based on PUCCH format 1b may be transmitted through puncturing of bPUCCH. To this end, five or more HARQ-ACK symbols (eg, four or more HARQ-ACK symbols and an additional one base HARQ-ACK symbol intended to be included in the sPUCCH) must be transmitted, and thus source encoding or channel encoding should be used. This is not suitable for the URLLC scenario in which the sPUCCH must be suddenly transmitted, but is more suitable for the carrier aggregation scenario or the dual connectivity scenario in which the UE can predict the existence of HARQ-ACK bits using the short PUCCH in advance.

If the URLLC scenario is considered, one UL out of four HARQ-ACK symbols, if a total of four or less HARQ-ACK symbols including HARQ-ACK symbols for three or fewer short PUCCHs are transmitted. An average of one HARQ-ACK symbol may be allocated to the symbol. For example, when a HARQ-ACK symbol for a short PUCCH is to be transmitted in a third bPUCCH payload symbol among a total of four payload symbols, it is represented by [d ₀ , d ₀ , d ₁ , d ₀ ]. Can be. If HARQ-ACK for a short PUCCH is to be transmitted in the second, third, and fourth bPUCCH payload symbols of the four payload symbols, the serving cell (or serving cell eNB) is short to the UE. short) corresponds to a case where three consecutive scheduling assignments for the PDSCH are delivered in succession, and may be expressed as [d ₀ , d ₁ , d ₂ , d ₃ ].

When the UE generates a bPUCCH payload symbol, the UE performs encoding by using the HARQ-ACK bits determined as described above. The serving cell (or serving cell eNB) receives bPUCCH and detects d ₀ and d _i (where i = 1,2, ...).

If the UE fails while receiving the sPDCCH, since the UE does not recognize the sPDSCH, it cannot transmit HARQ-ACK d _i (i> 0) but transmits HARQ-ACK d ₀ . In this case, the serving cell (or serving cell eNB) cannot distinguish whether the HARQ-ACK received in the interval of the sTTI corresponds to part of bPUCCH (ie, DTx) or part of short PUCCH. Specifically, if the UE does not receive the sPDCCH, the UE should transmit d ₀ because it does not have information about d _i . In this case, even if the serving cell (or serving cell eNB) performs QPSK demodulation in the UL symbol, the demodulated HARQ-ACK is HARQ-ACK for the base PDSCH (eg, d ₀ ) or HARQ-ACK for the short PDSCH. (E.g. d _i ) is unknown. For example, if d ₀ = (1 + j) / sqrt (2) and d _i = (1-j) / sqrt (2), since the value of d ₀ and d _i is different, the serving cell (or The serving cell eNB) may consider that the UE has normally received the sPDCCH. By the way, when d ₀ = d _i , the serving cell (or serving cell eNB) cannot know whether the UE normally receives the sPDCCH.

In addition, when the UE transmits HARQ-ACK bits for the sPUCCH while using the OCC in transmitting the bPUCCH, the value of the time domain symbol is punctured and changed. This reduces the time domain multiplexing performance obtained by the serving cell (or serving cell eNB).

Method P510 for method P500 is a 'DTx detection by subslot index scrambling' method.

Sequence index used for the LTE PUCCH is determined based on the hopping group (f _gh (n _s)) and the shift sequence (f _ss). The sequence index used for DM-RS and the sequence index used for payload are the same. If sTTI (or subslot m _s ) is introduced, this sequence index can be generated using m _s as a parameter. Therefore, in case of a non-DTx in which the UE should transmit HARQ-ACK bits using sPUCCH, the sequence index used in the corresponding subslot may be defined differently from the sequence index used for HARQ-ACK bits using base PUCCH. have. The serving cell (or serving cell eNB) detects the sequence index applied to the corresponding sTTI (or subslot m _s ) through blind detection on the received bPUCCH, and determines whether the UE corresponds to DTx or non-DTx. do. That is, the serving cell (or serving cell eNB) may distinguish whether the HARQ-ACK received from the corresponding sTTI is d ₀ or d _i (where i> 0).

However, since more d _i (where i> 0) increases, the number of PUCCH payload symbols allocated to d ₀ by the UE decreases, so the coverage of bPUCCH decreases.

Method P520 for Method P500 is a 'sPUCCH by sequence selection' method.

Method P520 is a method of detecting a HARQ-ACK symbol for a corresponding short PUCCH by detecting a sequence index from a bPUCCH received by a serving cell (or serving cell eNB) and assigned a sequence index as a resource. Since the HARQ-ACK symbol for the sPUCCH supported by one subslot is generated from two bits and has four cases, the UE can derive a sequence index accordingly.

The LTE PUCCH determines the sequence index based on (f _gh (n _s ) + f _ss ) mod 30. An offset Δ _ss applied to the HARQ-ACK bit for the short PUCCH may be additionally introduced here. For instance, UE is the sequence index used in the sub slot _s m,

Can be derived based on The possible offset value may consist of four natural numbers and may be defined as a function of m _s (eg, Δ _ss (m _s )) for interference randomization.

In this way, the serving cell (or serving cell eNB) can detect the HARQ-ACK symbol indirectly by detecting the sequence index using cross correlation. In addition, since the sequence index may be different from the sequence index used for the base PUCCH payload symbol, the serving cell (or serving cell eNB) may determine whether DTx. If d ₀ is applied to the generated sequence by the UE, since the base HARQ-ACK can utilize substantially four payload symbols, the coverage of the bPUCCH can be maintained to a large extent. However, depending on the amount of residual interference in the interference randomization process, the coverage of the bPUCCH may be somewhat reduced.

Only base sequences with high cross correlation performance can be selected. For example, a separate index is combined among the 30 base sequences allowed for LTE PUCCH. In order to further transmit k short HARQ-ACKs (e.g., k = 1, 2, 3, 4), a sequence index set may be determined so that the cross correlation between k sequences is small. In case of LTE, the norm of pairwise cross correlation for three length-12 sequences may be two, and autocorrelation may correspond to twelve.

Even if the sequence index of the bPUCCH payload and the sequence index of the sPUCCH payload are the same, since the cyclic shift used by the UE is different for each UE, the serving cell (or serving cell eNB) can easily determine whether DTx and intra-cell interference Intra-cell interference may also be randomized. If different UEs transmit the same sequence to the serving cell (or serving cell eNB) in the same subslot, the serving cell (or serving cell eNB) uses one UE-specific cyclic shift. Only UE can be distinguished.

For example, a noiseless case is considered, so that the received signal of the nth subcarrier is

It can be expressed as. Here, d _u , d _v represents a HARQ-ACK symbol, r (n) represents a sequence element corresponding to the n-th subcarrier,

Denotes a UE-specific cyclic shift. To detect d _u ,

Can be calculated. If addition is performed on subcarrier n to detect d _u , then the amount of residual interference is

It is proportional to the size of norm. If the difference between the UE-specific cyclic shifts is sufficiently random, the magnitude of the value is not so large compared to one. Therefore, since the amount of residual interference is not so large, the coverage at which the transmission of d _u arrives is not significantly affected by d _v .

When method P521 for method P520 is used, the UE determines a sequence index based on (f _gh (n _s ) + f _ss ) mod 30 as in LTE PUCCH and cyclic shift values used in a specific subslot m _s You can decide differently. The UE may generate a UL symbol belonging to a subslot by selecting a cyclic shift value according to an HARQ-ACK symbol to be transmitted using a Short PUCCH. The serving cell (or serving cell eNB) may estimate the value of the HARQ-ACK symbol by detecting the cyclic shift value applied to the subslot m _s .

The modified PUCCH format 1b is described as an example.

FIG. 14A illustrates a case in which the DM-RS symbol index for the LTE PUCCH format 1b is used the same and sPUCCH and bPUCCH share the DM-RS. As another example of FIG. 14A, a case in which the DM-RS symbol index of the base PUCCH is used differently is illustrated in FIG. 15.

FIG. 15 illustrates three UL control subslots in a base PUCCH having seven UL symbols according to an embodiment of the present invention, and each UL control subslot includes three, two, and two UL symbols (eg, ( 3, 2, 2)).

The UL slot consists of seven UL symbols, and the UL slot includes three UL control subslots. Three UL control subslots belonging to the UL slot may be represented by (3, 2, 2). The first of three UL control subslots (UL control subslot 1) includes three time domain symbols, the second control subslot (UL control subslot 2) includes two time domain symbols, 3 The first subslot (UL control subslot 3) contains two time domain symbols. UL control subslot 1 includes two payload symbols, UL control subslot 2 and UL control subslot 3 include one payload symbol. Alternatively, a UL slot may be configured. For example, the UL slot may be configured as (2,3,2) or (2,2,3), and in this case, the following method may be equally applied.

In case the UL slot is configured with (3,2,2) as illustrated in FIG. 15, since the DM-RS is transmitted in the first UL symbol among the seven UL symbols belonging to the UL slot, the gNB (or eNB) is The UL channel estimation can be completed earlier. Through this, demodulation latency of the UL control channel may be reduced.

16A and 16B illustrate a case in which a base PUCCH is punctured through one short PUCCH according to an embodiment of the present invention. In detail, FIG. 16A illustrates a case where the UL control subslot 1 is punctured, and FIG. 16B illustrates a case where the UL control subslot 2 is punctured.

As illustrated in FIG. 16A, when the UL control subslot 1 is punctured, two time domain symbols except for the DM-RS symbol among three time domain symbols belonging to the UL control subslot 1 are punctured through a short PUCCH. Being treated.

As illustrated in FIG. 16B, when UL control subslot 2 is punctured, two time domain symbols (including DM-RS symbols) belonging to UL control subslot 2 are punctured through a short PUCCH.

17A and 17B illustrate a case in which a base PUCCH is punctured through two or more short PUCCHs according to an embodiment of the present invention. In detail, FIG. 17A illustrates a case where two UL control subslots are punctured, and FIG. 17B illustrates a case where three UL control subslots are punctured.

FIG. 17A illustrates a case in which the UL control subslot 1 and the UL control subslot 2 are punctured through the short PUCCH among the cases where the base PUCCH is punctured through two short PUCCHs. In this case, the DM-RS symbol index corresponds to the first symbol and the last to second symbol among the seven UL symbols belonging to the UL slot. The base PUCCH is transmitted only in the last symbol among the seven UL symbols belonging to the UL slot.

In FIG. 17B, the case where the base PUCCH is punctured through three short PUCCHs is illustrated. That is, UL control subslot 1, UL control subslot 2, and UL control subslot 3 are punctured via a short PUCCH. The DM-RS symbol is located in the first symbol among seven UL symbols belonging to the UL slot. In this case, the twelve subcarriers and two time domain symbols that make up the short PUCCH correspond to 24 REs. By utilizing any sequence (sequence) of length 24, a short PUCCH can be defined. The UE multiplies the sequence by the HARQ-ACK symbol to generate a short PUCCH, and transmits it to the serving cell (or serving cell eNB).

Method P530 for Method P500 is a method for separately defining a DM-RS.

The method P530 allocates some of the 24 REs for the DM-RS and others for the payload such as a HARQ-ACK symbol.

If SC-FDMA is used to maintain a single carrier property in a short PUCCH, a method of distinguishing a DM-RS symbol and a payload symbol may be used. Therefore, the first UL symbol belonging to the UL control subslot 1 is allocated separately for the DM-RS, and consequently, the first and second time domain symbols among the time domain symbols belonging to the UL slot are allocated for the DM-RS. The second UL symbol belonging to UL control subslot 1 carries the payload.

If this method is applied similarly to UL control subslot 2, the first time domain symbol belonging to UL control subslot 2 is allocated for DM-RS, and the second UL symbol belonging to UL control subslot 2 is used to pay the payload. To pass.

If this method is applied similarly to UL control subslot 3, the first time domain symbol belonging to UL control subslot 3 is allocated for DM-RS, and the second UL symbol belonging to UL control subslot 3 is used to pay the payload. To pass.

The UE may further perform DFT preprocessing on the UL symbol carrying the payload to reduce the peak to average power ratio (PAPR).

Method P540 for Method P500 is a method that does not define DM-RS separately.

To process two time domain symbols, two 12-length sequences may be used, and the two sequences may be mapped symbol-by-symbol to the two time domain symbols. Alternatively, one 24-length sequence may be used to process two time domain symbols. Even when puncturing is performed, since at least one DM-RS symbol exists, the HARQ-ACK bit may be transmitted based on angle information of the sequence.

Method P541 for Method P540 is a method that utilizes a 24-length sequence.

Method P541 uses one sequence (sequence) over 24 REs.

Since the serving cell (or serving cell gNB, serving cell eNB) cannot perform coherent detection because there is no DM-RS, non-coherent sequence detection is performed.

The UE receives four sequences (sequences) in advance, and selects one sequence (sequence) among four sequences (sequences) according to HARQ-ACK 2 bits. The length of the sequence is 24.

18A and 18B are diagrams illustrating a RE mapping method of a sequence (sequence) according to an embodiment of the present invention. Specifically, subcarrier-symbol mapping is illustrated in FIG. 18A, and symbol-subcarrier mapping is illustrated in FIG. 18B.

As illustrated in FIG. 18A, the UE may perform frequency mapping before time mapping and then time mapping. Alternatively, as illustrated in FIG. 18B, the UE may perform time mapping before frequency mapping and then perform frequency mapping.

On the other hand, since these REs belong to the same physical resource block (PRB), the same channel estimation is utilized, and since these REs are for one sequence (sequence), the serving cell (or serving cell gNB, serving cell eNB) The HARQ-ACK bit cannot be detected in advance until all REs having a sequence are received. No matter how the UE permutates the sequence (sequence) and RE mapping, the serving cell (or serving cell gNB, serving cell eNB) is unlikely to expect a performance gain.

As a special example of this method, in the RE mapping illustrated in FIG. 18A, a bundle of twelve REs may be mapped to one sequence (sequence) and two bundles may be bundled via OCC. For example, the LTE system may use a sequence of length 12 (sequence) twice and generate a sequence of 24 lengths (sequence) using a time domain OCC.

Modified PUSCH is described as an example.

In case the UL slot consists of seven time domain symbols, one time domain symbol may be allocated for the DM-RS, and the remaining six time domain symbols may constitute three UL control subslots. In this case, since the DM-RS symbol may be located in the middle of the UL slot (ie, the fourth time domain symbol of the seven time domain symbols) and is not punctured, multiplexing with the PUSCH DM-RS (eg, CDM ( code division multiplexing) In FIG. 19, UL control subslot 1 and UL control subslot 3 include two consecutive UL symbols, while UL control subslot 2 is a DM-RS symbol among the three symbols. It may include two UL symbols except for.

20 is a diagram of a computing device, in accordance with an embodiment of the invention. The computing device TN100 of FIG. 20 may be a UE, serving cell, eNB, gNB, or the like described herein. Alternatively, the computing device TN100 of FIG. 20 may be a wireless device, a communication node, a transmitter, or a receiver.

In the embodiment of FIG. 20, the computing device TN100 may include at least one processor TN110, a transceiver TN120 connected to a network to perform communication, and a memory TN130. In addition, the computing device TN100 may further include a storage device TN140, an input interface device TN150, an output interface device TN160, and the like. Components included in the computing device TN100 may be connected by a bus TN170 to communicate with each other.

The processor TN110 may execute a program command stored in at least one of the memory TN130 and the storage device TN140. The processor TN110 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to an embodiment of the present invention are performed. Processor TN110 may be configured to implement the procedures, functions, and methods described in connection with embodiments of the present invention. The processor TN110 may control each component of the computing device TN100.

Each of the memory TN130 and the storage device TN140 may store various information related to an operation of the processor TN110. Each of the memory TN130 and the storage device TN140 may be configured of at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory TN130 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

The transceiver TN120 may transmit or receive a wired signal or a wireless signal. The computing device TN100 may have a single antenna or multiple antennas.

On the other hand, the embodiment of the present invention is not implemented only through the apparatus and / or method described so far, but may be implemented through a program that realizes a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Such implementations can be readily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims

An uplink transmission method of a first communication node,

When the uplink pilot time slot (UpPTS) and the first uplink (UL) subframe of a special subframe are aggregated as extended UL subframes, Receiving a reference signal configuration for an UpPTS; And

If the number of time domain symbols belonging to the UpPTS is less than or equal to a predetermined number, allocating a reference signal to the first UL subframe among the UpPTS and the first UL subframe based on the reference signal configuration;

Uplink transmission method comprising a.
The method of claim 1,

The predetermined number is three,

The reference signal is a DM (demodulation) -RS (reference signal),

Allocating a reference signal to the first UL subframe,

Allocating the reference signal to each of a first slot and a second slot belonging to the first UL subframe;

Uplink transmission method.
The method of claim 1,

If the number of time domain symbols belonging to the UpPTS exceeds the predetermined number, allocating the reference signal to the UpPTS and the first UL subframe based on the reference signal setting

Uplink transmission method further comprising.
The method of claim 3,

Allocating the reference signal to the UpPTS and the first UL subframe,

Assigning the reference signal to a fourth time domain symbol at the end of the time domain symbols belonging to the UpPTS;

Uplink transmission method.
The method of claim 4, wherein

The first UL subframe includes a first slot and a second slot next to the first slot,

OCC (orthogonal cover code) or cyclic shift (cyclic shift) for the reference signal allocated to the UpPTS,

Same as OCC or cyclic shift for the reference signal assigned to the second slot

Uplink transmission method.
The method of claim 1,

The same physical uplink shared channel (PUSCH) transmit power control (TPC) is applied to the special subframe and the first UL subframe.

Uplink transmission method.
The method of claim 1,

Receiving one UL grant for scheduling of the extended UL subframe from the second communication node,

The one UL grant is based on the index of the first UL subframe

Uplink transmission method.
The method of claim 1,

When a physical hybrid automatic repeat and request indicator channel (PHICH) is received from the second communication node in a downlink (DL) subframe having an index of n, a physical uplink shared channel (PUSCH) for retransmission is indexed. transmitting in the extended UL subframe that is (n + k),

The index of the first UL subframe is (n + k) and the index of the special subframe is (n + k-1).

Uplink transmission method.
The method of claim 1,

Transmitting a physical uplink shared channel (PUSCH) to the second communication node in the extended UL subframe whose index is (n-k); And

Receiving, from the second communication node, a physical hybrid automatic repeat and request indicator channel (PHICH) for the PUSCH in a downlink (DL) subframe having an index of n;

The index of the first UL subframe is (n-k) and the index of the special subframe is (n-k-1).

Uplink transmission method.
An uplink (UL) transmission method of a first communication node,

Transmitting an UL data channel to a second communication node in an uplink pilot time slot (UpPTS) of a special subframe and an extended UL subframe in which the first UL subframe is aggregated; And

Receiving, from the second communication node, a response channel for the UL data channel in a first downlink (DL) subframe,

The index of the extended UL subframe is determined to be the same as the index of the first UL subframe.

Uplink transmission method.
The method of claim 10,

The indices of the special subframe and the first UL subframe are respectively (n-k-1) and (n-k), and the index of the first DL subframe is n.

Uplink transmission method.
The method of claim 10,

Receiving, in a second DL subframe, a UL grant for the extended UL subframe from the second communication node,

The index of the second DL subframe is determined based on the index of the first UL subframe.

Uplink transmission method.
The method of claim 10,

Allocating a DM (demodulation) -RS (RS) to the UpPTS according to the number of time domain symbols belonging to the UpPTS

Uplink transmission method further comprising.
The method of claim 13,

Allocating a DM-RS to the UpPTS,

Allocating the DM-RS to the first UL subframe among the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS is 3 or less; And

Allocating the DM-RS to the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS is 4 or more;

Uplink transmission method.
As a communication method of an evolved node B (eNB),

When the uplink pilot time slot (UpPTS) and the first uplink (UL) subframe of a special subframe are aggregated as extended UL subframes, the time domain belonging to the UpPTS Determining a demodulation (DM) -reference signal (DM) configuration for the extended UL subframe based on the number of symbols; And

Transmitting the DM-RS configuration to a user equipment (UE)

Communication method comprising a.
The method of claim 15,

Determining the DM-RS settings,

Determining the DM-RS configuration so that the DM-RS is allocated to the first UL subframe among the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS is less than or equal to a predetermined number. Containing

Communication method.
The method of claim 15,

Determining the DM-RS settings,

Determining the DM-RS configuration so that the DM-RS is allocated to the UpPTS and the first UL subframe when the number of time domain symbols belonging to the UpPTS exceeds a predetermined number.

Communication method.
The method of claim 15,

Transmitting, in a first downlink (DL) subframe, a UL grant for the extended UL subframe to the UE;

The index of the extended UL subframe is determined to be the same as the index of the first UL subframe, and the index of the first DL subframe is determined based on the index of the first UL subframe.

Communication method.
The method of claim 15,

Transmitting a physical hybrid automatic repeat and request indicator channel (PHICH) to the UE in a first downlink (DL) subframe; And

Receiving a physical uplink shared channel (PUSCH) for retransmission from the UE in the extended UL subframe,

The index of the first DL subframe is n, the index of the extended UL subframe is (n + k), the index of the first UL subframe is (n + k), and the index of the special subframe is (n + k-1) phosphorus

Communication method.
The method of claim 15,

Receiving a physical uplink shared channel (PUSCH) from the UE in the extended UL subframe; And

Transmitting a physical hybrid automatic repeat and request indicator channel (PHICH) for the PUSCH to the UE in a first downlink (DL) subframe;

The index of the extended UL subframe is (nk), the index of the first DL subframe is n, the index of the first UL subframe is (nk), and the index of the special subframe is (nk-1). ) sign

Communication method.