KR20180131328A - Methods for multiplexing scheduling request and HARQ ACK/NACK while transmitting and receiving PUCCH and Apparatuses thereof - Google Patents

Abstract

Embodiments of the present invention relate to a method for multiplexing and transceiving scheduling request information and HARQ ACK/NACK information through a short PUCCH (sPUCCH) including two or three symbols when transmitting an uplink control channel. According to an embodiment of the present invention, a method for transmitting an uplink control channel by a terminal, comprises the steps of: configuring an uplink control channel resource for indicating only HARQ ACK/NACK information and an uplink control channel resource for simultaneously indicating scheduling request information and the HARQ ACK/NACK information; setting the uplink control channel including the scheduling request information and the HARQ ACK/NACK information; and transmitting the uplink control channel including two or three symbols to a base station at one short transmission time interval (sTTI).

Description

[0001] The present invention relates to a method and apparatus for multiplexing scheduling requests and HARQ ACK / NACK information during uplink control channel transmission and reception, and a method and apparatus for multiplexing HARQ ACK /

The present embodiments propose a method and apparatus for multiplexing scheduling request information and HARQ ACK / NACK information through a short PUCCH (pUCCH) composed of two or three symbols in a short transmission time interval during uplink control channel transmission / reception.

Research and discussions are under way for latency reduction in 3GPP LTE / LTE-Advanced systems. The main purpose of latency reduction is to standardize the operation of shorter transmission time intervals (hereinafter referred to as 'short TTI' or 'sTTI') to improve TCP throughput.

The frame structure of such a short transmission time interval forms a frame by 2, 3 or 7 symbol units in the existing LTE / LTE-Advanced frame structure, i.e., TTI = 1 ms = 14/12 OFDM symbols, It is possible to transmit and receive data based on a frame structure of intervals to reduce delay and improve data throughput.

A discussion of the performance of short TTIs is underway, and discussions are underway on the feasibility, performance, and backward compatibility of TTI lengths between 0.5ms and one OFDM symbol.

A sequenced-based short PUCCH (pUCCH) transmission was determined in the study of the physical layer of short TTI described above. The sequence-based sPUCCH is an uplink control channel (PUCCH) composed of two or three symbols and does not use DMRS. However, a specific method for transmitting not only the HARQ ACK / NACK (hereinafter referred to as 'A / N' or 'ACK / NACK') information but also the SR (Scheduling Request) information using the current sequence- Discussions are in progress.

It is an object of the present embodiments to provide a concrete operation method of a UE and a base station for transmitting and receiving scheduling request information and HARQ ACK / NACK information through the sPUCCH consisting of two or three symbols at the time of uplink control channel transmission and reception There is.

According to an embodiment of the present invention, there is provided a method for transmitting an uplink control channel, the method comprising: transmitting uplink control channel resource and scheduling request information for indicating only HARQ ACK / NACK information and HARQ ACK / NACK information Configuring an uplink control channel for instructing the HARQ ACK / NACK information simultaneously, configuring an uplink control channel including scheduling request information and HARQ ACK / NACK information, and setting 2 or 3 And transmitting the uplink control channel including the uplink control channel to the base station.

In an exemplary embodiment of the present invention, a method for receiving an uplink control channel includes the steps of: receiving an uplink control channel resource and scheduling request information for indicating only HARQ ACK / NACK information and an uplink The method includes transmitting information for configuring a control channel resource to a terminal, receiving an uplink control channel composed of two or three symbols in one short transmission time interval (sTTI) from the terminal, The method comprising: detecting scheduling request information and HARQ ACK / NACK information from the Node B;

In an exemplary embodiment of the present invention, in a UE transmitting an uplink control channel, an uplink control channel for indicating only HARQ ACK / NACK information, an uplink control channel for simultaneously indicating scheduling request information and HARQ ACK / NACK information, A control unit for configuring an uplink control channel including scheduling request information and HARQ ACK / NACK information, and an uplink control channel including two or three symbols in one short transmission time interval (sTTI) And a transmitter for transmitting the data to the base station.

In an exemplary embodiment of the present invention, a Node B receiving an uplink control channel includes an uplink control channel resource for indicating only HARQ ACK / NACK information, an uplink control channel for simultaneously indicating scheduling request information and HARQ ACK / NACK information, A transmitter for transmitting information for configuring resources to a mobile station, a receiver for receiving an uplink control channel composed of two or three symbols in one short transmission time interval (sTTI) from a terminal, a scheduling request from an uplink control channel And a controller for detecting information and HARQ ACK / NACK information.

The embodiments described above provide a concrete method for transmitting and receiving the scheduling request information and the HARQ ACK / NACK information through the sPUCCH consisting of two or three symbols at the time of transmitting and receiving the UL control channel by the UE and the base station .

1 is a diagram illustrating processing delays and a HARQ RTT (Round Trip Time) in a BS and a UE.
2 is a diagram for explaining resource mapping per physical resource block (PRB) in one subframe.
3 is a diagram for explaining an uplink structure of a conventional (legacy) PUCCH.
4 is a diagram for explaining a configuration conceptual diagram of a conventional (legacy) PUCCH.
5 is a diagram illustrating a procedure in which a UE transmits an uplink control signal in the present embodiment.
6 is a diagram illustrating a procedure in which a base station receives an uplink control signal in the present embodiment.
7 is a diagram showing an sTTI composed of two or three symbols in the downlink.
8 is a diagram showing an sTTI composed of two or three symbols in the uplink.
9 is a diagram illustrating a structure of an sPUCCH including two symbols without DMRS.
10 is a diagram illustrating a configuration of a base station according to the present embodiments.
11 is a diagram illustrating a configuration of a user terminal according to the present embodiments.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, in the present specification, a base station or a cell has a comprehensive meaning indicating a part or function covered by BSC (Base Station Controller) in CDMA, Node-B in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in the present specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-Advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-Advanced, the uplink and downlink are configured on the basis of one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, the PDCCH, which is an embodiment of the present invention, may be applied to the PDCCH, and the PDCCH may be applied to the portion described with the EPDCCH.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

One embodiment of the present invention relates to asynchronous wireless communications that evolve into LTE / LTE-Advanced, IMT-2020 over GSM, WCDMA, HSPA, and synchronous wireless communications such as CDMA, CDMA- Can be applied.

In this specification, a MTC (Machine Type Communication) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type. Or a further Enhanced MTC terminal defined in Release-14.

In this specification, NarrowBand Internet of Things (NB-IoT) terminal means a terminal supporting wireless access for cellular IoT. The objectives of NB-IoT technology include improved indoor coverage, support for large-scale low-rate terminals, low latency sensitivity, ultra-low cost, low power consumption, and optimized network architecture.

Enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) have been proposed as typical usage scenarios in NR (New Radio), which is under discussion in 3GPP.

In this specification, a frequency, a frame, a subframe, a resource, a resource block, a region, a band, a subband, a control channel, a data channel, a synchronization signal, various reference signals, various signals, May be interpreted as past or presently used meanings or various meanings used in the future.

Latency reduction

Latency reduction is under discussion. The main purpose of latency reduction is to standardize the operation of shorter transmission time intervals (hereinafter referred to as 'short TTI' or 'sTTI') to improve TCP throughput.

Potential impacts and studies are underway in the following areas.

o Evaluate the specification impact / study feasibility / performance when the TTI length is one OFDM symbol at 0.5ms considering the influence on the control signal of the reference signal and the physical layer. lengths between 0.5ms and one OFDM symbol, taking into account the impact on reference signals and physical layer control signaling)

o Compatible with the existing system, it must support the operation of the terminal prior to Rel 13 on the same carrier (back-up compatibility shall be preserved).

Delay reduction can be achieved through the following physical layer techniques. (Latency reduction can be achieved by the following physical layer techniques)

- Short transmission time interval (short TTI)

- Reduced processing time in implementation

- In TDD, a new frame structure of TDD

Further discussion on latency reduction is further discussed below.

■ Following design assumptions are considered:

   o The short transmission time interval does not exceed the subframe interval (TTI spans over subframe boundary)

   o PDCCH and legacy PDSCH are used for scheduling at least for SIB and paging. (At least for SIBs and paging, PDCCH and legacy PDSCH are used for scheduling)

■ Potential impacts for the following are studied (the potential specific impacts for the followings are studied)

  o The UE is expected to receive the sPDSCH at least through downlink unicast. (UE is expected to receive a downlink unicast at the SDSCH)

 The sPDSCH indicates a PDSCH carrying data in a short TTI (sPDSCH referred PDSCH carrying data in a short TTI)

  o The UE is expected to receive the PDSCH through downlink unicast. (UE is expected to receive PDSCH for downlink unicast)

 The UE can simultaneously receive the PDSCH and the PDSCH through downlink unicast (whether a UE is expected to receive both PDSCH and PDSCH for downlink unicast simultaneously)

o Further study of the number of short TTIs supported (the number of supported short TTIs)

o If the number of short TTIs supported is more than one (If the number of supported short TTIs is more than one,

■ The following design assumptions can be used in the study (following design assumptions are used for the study)

From the base station point of view, the existing non-sTTI and sTTI can be frequency division multiplexed in the same subframe of the same carrier (From eNB perspective, existing non-sTTI and sTTI can be FDMed in the same subframe in the same carrier)

A further study on other multiplexing methods for terminals supporting latency reduction features in existing non-sTTIs (FFS: Other multiplexing method (s) with supporting latency reduction features)

■ In this study, we assume the following points (in this study, the following aspects are assumed in RAN1.)

o Procedures related to PSS / SSS, PBCH, PCFICH, PRACH, random access, paging and SIB are not changed (PSS / SSS, PBCH, PCFICH and PRACH, Random access, SIB and Paging procedures are not modified.

■ Further discussions are made on the following aspects: (1)

o Research is not limited to the following:

o Design of sPUSCH DM-RS of DM-RS of sPUSCH

(1): The same DM-RS symbol is shared among several short-TTIs in the same subframe (Alt.1: DM-RS symbol shared by multiple short-TTIs within the same subframe).

(2) Each sPUSCH has a DM-RS. (Alt.2: DM-RS contained in each sPUSCH)

o HARQ for sPUSCH on sPUSCH

Whether or not to recognize asynchronous and / or synchronous HARQ (synchronous HARQ)

o In addition to the non-CA case, the sTTI operation in PCell and SCell in the CA (sTTI operation for Pcell and / or SCells by (e) CA in addition to non-

1 is a diagram for explaining processing delays and HARQ RTT (Round Trip Time) in a Node B and a UE.

Basically, in the average down-link latency calculation, the delay can be calculated according to the following procedure.

The unidirectional delay in the user plane of LTE for the scheduled UE may consist of fixed node processing delay as shown in Figure 1 below and one TTI duration for transmission. Assuming that the processing time can be scaled by the same TTI reduction factor that maintains the same number of HARQ processes, the unidirectional delay can be calculated as follows (see Equation B.2.1 in 3GPP TR 36.912, the LTE U-plane one-way latency for a scheduled UE consists of the fixed node processing delays and 1 TTI duration for transmission, as shown in Figure A.1 below. TTI reduction keeping the same number of HARQ processes, the one way latency can be calculated as)

D = 1.5 TTI + 1 TTI + 1.5 TTI UE + n * 8 TTI (HARQ retransmissions)

    = (4 + n * 8) TTI.

If there is a retransmission of 0 or 1 and the probability of error in the first transmission is p, then the delay can be calculated as follows (Considering a typical case where there would be 0 or 1 retransmission, and assuming error probability of the first transmission to be p, the delay is given by)

D = (4 + p * 8) TTI.

So, for 0% BLER (Block Error Rate), D = 4 * TTI,

And for 10% BLER, D = 4.8 * TTI.

At the UE  Average uplink transmission delay calculation starting (Average UE  initiated UL transmission latency calculation)

It is assumed that the UE desires an uplink transmission such as a connection state, a synchronization state, and a transmission of a TCP ACK. Table 1 discloses the steps for the uplink delay and the corresponding contribution. In order to maintain consistency in the comparison between the downlink and the uplink, the eNB adds eNB processing delay after receiving the uplink data. (Step 7) (Assume UE is in connected / synchronized mode and wants to do UL transmission , to send TCP ACK. The following table shows the steps and their corresponding contribution to the UL transmission latency. To be consistent in the comparison of DL and UL, we add the eNB processing delay in the UL after the UL data is received by the eNB step 7).)

In the above table, it is assumed that the half delay of steps 1 and 4 is due to a scheduling request and the remainder is assumed for uplink data transmission. (In the table above, steps 1-4 and half delay of step 5 is assumed to be due to SR, and rest is assumed for UL data transmission shown in Table 4)

short At TTI  resource Mapping (Resource mapping of short TTI )

In FIG. 2, considering the control field composed of two antenna ports and two OFDM symbols, the above resource map represents an existing resource mapping of the PRB in one subframe. In FIG. 2, the following resource map is a short TTI resource mapping considering a control field composed of two OFDM symbols to ensure backward compatibility. In the short TTI, it is assumed that the loss rate at the PHY layer is (L _legacy , eg 5% - 50%). (In Figure 2, the resource map above is the legacy resource mapping per PRB in one subframe, considering 2 Antenna ports and 2 The loss rates (L _legacy , eg 5% - 50%) are used for the OFDM symbol control field. In Figure 2, the resource map below is the short TTI resource mapping, ) of the PHY layer in short TTI duration are assumed.

short At TTI  TBS Calculation of short TTI )

According to the resource mapping and transmission block size (TBS) calculation formula, the loss rate of the PHY layer with respect to the existing PDSCH can be calculated as follows (According to the TBS calculation formula given above, the loss rate of PHY layer for legacy PDSCH is calculated as follows:

For the different short TTI duration, the transport block size in the PDSCH of the short TTI can be calculated as shown in the following Table 2. (For different short TTI duration, the TBS of the short TTI PDSCH is calculated as the following table)

existing PUCCH [Existing PUCCH ]

The UL control channel through which the UE sends a response to PDSCH reception to the BS is the PUCCH. The UE can use various formats of PUCCH format to transmit Ack / Nack and CQI information for the downlink data channel to the eNB.

In the conventional LTE / LTE-Advanced frame structure (TTI = 1 ms = 14 OFDM symbols (Normal CP) / 12 OFDM symbols (Extended CP)), slot based PUCCH hopping can be performed as shown in FIG. This PUSCH hopping increases the frequency diversity of the PUCCH and consequently increases the coverage of the PUCCH. This is because basically the same signal or one information sequence is transmitted through different frequency bands, so that there is a gain to obtain diversity.

In transmitting the A / N (Ack / Nack) from the existing PUCCH, the resource allocation is applied by OCC (spreading) + CS (cyclic shift) on the basis of format 1a and 1b. As shown in FIG. 4, the existing PUCCH is set to 3 symbols RS and 4 symbols A / N on a slot basis.

In the present invention, consideration is given to the CS-based A / N multiplexing resource allocation of the Zadoff-Chu (ZC) sequence excluding the existing OCC considering that the number of symbols of the sPUCCH is reduced. Unlike the existing structure, OCC spreading is not used at this time.

에서 정의되는 cyclic shift 값으로 정의될 수 있다.The ZC sequence is basically the RS

And a cyclic shift value defined by the following equation.

In the present invention, the following basic structure is assumed for the sPUCCH A / N configuration in which OCC is excluded.

Here, the PUCCH format 1a / b performs dynamic resource allocation. Basically, the PUCCH format 1a / b performs the same dynamic allocation as shown in Equation 2 based on the CCE index of the scheduled PDCCH.

은 하향 자원 할당에 사용된 햐향링크 제어 정보(DCI) 전송에 사용된 PDCCH의 가장 낮은 CCE 인덱스(lowest CCE index)인

와 상위 레이어에서 전송되는

에 의해서 결정된다. 여기에서

은 결국 PUCCH format 1a/1b가 다른 PUCCH format 2/3/4 등과 분리될 수 있도록 설정된 일종의 shift 값을 의미한다.Here, the PUCCH resource index for Ack / Nack

(Lowest CCE index) of the PDCCH used for downlink control information (DCI) transmission used for downlink resource allocation

And the upper layer

. From here

Refers to a kind of shift value set so that the PUCCH format 1a / 1b can be separated from other PUCCH format 2/3/4 and the like.

The following are additional agreements regarding the recent sTTI.

S Support for transmission duration based on 2-symbol sTTI and 1-slot sTTI for sPDSCH / sPDCCH (Specify support for a transmission duration based on 2-symbol sTTI and 1-slot sTTI for sPDSCH / sPDCCH)

4) Set the support for 2-symbol sTTI, 4-symbol sTTI, and 1-slot sTTI-based transmission durations for sPUCCH / sPUSCH (Specify support for 2-symbol sTTI, 4-symbol sTTI, and 1-slot sTTI for sPUCCH / sPUSCH)

   o Down-selection is not precluded

■ Investigate the impact of channel state information on feedback and processing time and, if necessary, determine the necessary corrections (CSI feedback and processing time,

o Minimum timing n + 3 for FS1, 2 and 3 is supported only for UEs capable of shortening the HARQ processing time for the UL grant and DL data for uplink data (For FS1,2 & 3, a minimum timing n + 3 is supported for UL grant to UL data and DL data to DL HARQ for UEs capable of operating with reduced processing time only:

The maximum TA is reduced to x ms, where x is less than or equal to 0.33 ms (A maximum is reduced to x ms, where x <= 0.33 ms (exact values derived from the detailed study)

o At least when scheduled (PDCCH)

A new DL HARQ and uplink scheduling timing relationship is defined for FS2 (For FS2, new DL HARQ and UL scheduling timing relationships will be defined)

o Further detailed study (Details FFS)

o Additional Studies (FFS)

o Possible minimum timing of n + 2 TTI (n + 2 TTI)

o In this case, a further study on max TA (FFS max TA in this case)

o Additional constraints on when the reduced processing time of n + 2 TTIs can be applied (FFS what other restrictions (if any) on when reduced processing times of n + 2 could be applied)

o Possibility of scheduling by EPDCCH.

The reduced processing time can be set by the RRC to the UE (Reduced processing time (s) are RRC configured for the UE).

o A mechanism for dynamic fallback to legacy processing timings (n + 4) is supported for existing processing timing (n + 4)

Further discussion at the next meeting is as follows.

The following actions are applied to control the collision of conflicting UL grants at n + 3 and n + 4 timing (Adopt the following behaviors for the collision of UL grants with n + 3 and n + 4 timing)

o The UE does not expect to receive UL grants colliding with the scheduling PUSCH of n + 3 and n + 4 timings for the same UL subframe of the carrier. (The UE is not expected to receive conflicting UL grants with N + 3 and N + 4 timing scheduling PUSCH for the same UL subframe of a carrier)

- If the UE receives an UL grant that conflicts with the scheduling PUSCH of timing n + 3 and n + 4 for the same UL subframe of the carrier, the terminal's operation is handled by the terminal of the terminal. UE scheduling scheduling PUSCH for the same UL subframe of a carrier, UE behavior is up to UE implementation.

o In FS1, the UE does not expect to receive UL grants of n + 3 and n + 4 timing in the same subframe and carrier. (For FS1, the UE is not expected to receive UL grants with N + 3 and N + 4 timing in the same subframe and carrier)

- This does not imply specification change.

In addition, the following decisions were made at the next meeting.

o Sequence-based sPUCCH without DMRS has 2 bits of HARQ-ACK in 20S sTTI and 30S sTTI. (The sequence-based sPUCCH w / o DMRS is supported for up to two HARQ-ACK bits in 2OS sTTI and 3OS sTTI.

ACK / NACK information is mapped to different cyclic shifts (i.e., ACK and NACK are indicated by different Cyclic Shift Indexes). (ACK / NACK information maps to different cyclic shifts based on cyclic shift index))

- The cyclic shifts of different sPUCCH symbols may be different due to cyclic shift randomization (different cyclic shift randomization due to different sPUCCH symbols).

o Cyclic shift randomization can be reused from a 1 ms operation to support multiplexing with a conventional PUCCH. (Cyclic shift randomization is re-used from 1 ms operation to support multiplexing with legacy PUCCH)

- Only sPUCCH symbol-to-symbol frequency hopping is supported (only frequency hopping between sPUCCH symbol (s) is supported (no FH is not supported)).

- Only one RB per symbol is allocated (1 RB allocation per symbol)

- Further study: how to map SR + HARQ, hopping pattern and A / N information to cyclic shift (FFS: how to handle SR + HARQ, A / N information mapping to CS)

o to decide afterwards

As described above, research on the physical layer for short TTI is ongoing, and sequential-based sPUCCH transmission without using DMRS is determined in 2-symbol sPUCCH. However, currently, a specific method of handling the ACK / NACK information as well as the scheduling request information (SR) using the sPUCCH is being discussed.

The embodiments described below can be applied to a terminal, a base station, and a core network entity (MME) using all mobile communication technologies. For example, the present embodiments can be applied not only to mobile communication terminals to which LTE technology is applied but also to next generation mobile communication (5G mobile communication, New-RAT) terminals, base stations, and access and mobility functions (AMFs). For convenience of explanation, the base station may denote an eNB of an LTE / E-UTRAN or a base station (CU, DU, or CU and DU) in a 5G wireless network in which a CU (Central Unit) An entity implemented as a single logical entity), or gNB.

In addition, the general transmission time interval or the existing / legacy time interval described in the present specification means a subframe time interval of 1 ms used in the conventional LTE / LTE-Advanced. That is, in the conventional LTE / LTE-Advanced, since the time interval of one subframe is 1 ms and 14 symbols (in case of Normal CP) or 12 symbols (in case of Extended CP), the time interval is 14 symbols or 12 It can be a symbol. Therefore, in the following embodiments, what is expressed as conventional or general may refer to a conventional LTE / LTE-Advanced system with a sub-frame of 1 ms.

In addition, the type of the short transmission time interval described herein is for distinguishing the symbol length of the TTI in a short transmission time interval. Specifically, the symbol length means the number of symbols constituting one short transmission time interval Two, three, or seven.

In addition, the value of the cyclic shift described in this specification may mean the value of the cyclic shift index.

5 is a diagram illustrating a procedure in which a UE transmits an uplink control signal in the present embodiment.

5, the UE can configure uplink control channel resources for simultaneously indicating uplink control channel resources, scheduling request information, and HARQ ACK / NACK information for indicating only HARQ ACK / NACK information (S500) . The UE can receive information necessary for constructing the resources of the uplink control channel through RRC signaling or DCI signaling from the base station.

At this time, the resources of the uplink control channel can be determined using a plurality of cyclic shift indexes. Each cyclic shift index may be assigned to indicate scheduling request information or A / N information transmitted by a specific UE.

For example, the cyclic shift index 0 is allocated to indicate the scheduling request information of the UE # 1, the Cyclic Shift Index 1 is allocated to indicate ACK information of the UE # 1, the Cyclic Shift Index 2 is allocated to the UE UE # May be assigned to indicate NACK information of # 1. The Cyclic Shift Index No. 3 is allocated to indicate ACK information of the UE # 2, and the Cyclic Shift Index No. 4 may be allocated to indicate NACK information of the UE # 2. The Cyclic Shift Index No. 5 is allocated to indicate ACK information of the UE # 3, and the Cyclic Shift Index No. 6 may be allocated to indicate NACK information of the UE # 3.

In the frame structure of the short transmission time interval, the sequence-based sPUCCH can be composed of two or three symbols and does not use the DMRS. Therefore, it is possible to configure the ACK / NACK data for each UE to be mapped to different cyclic shift indexes of the ZC sequence in order to distinguish which UE transmits ACK or NACK without DMRS. Therefore, if a cyclic shift index value is detected in the sequence-based sPUCCH received by the base station, it is possible to check which specific UE has transmitted ACK or NACK.

At this time, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information in the resources of the uplink control channel and the uplink control resources allocated to indicate only the HARQ ACK / The number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is 2 (i.e., 2) if the HARQ ACK / NACK information is composed of 1 bit, .

Hereinafter, the case where the resource of the uplink control channel is a plurality of cyclic shift indexes will be described as an example.

If the resource of the uplink control channel is a plurality of cyclic shift indexes, the plurality of cyclic shift indexes described above may include indexes, scheduling request information, and HARQ ACK / NACK information allocated to indicate only HARQ ACK / NACK information And may include an index assigned to instruct at the same time.

For example, index # 4 of a plurality of cyclic shift indexes may be allocated to indicate only HARQ ACK information by UE # 1 which is a specific UE, and index # 5 may be allocated by UE # 1 to indicate only HARQ NACK information . The index # 1 may be allocated to UE # 2, which is another UE, to simultaneously indicate scheduling request information and HARQ ACK information. Index # 2 may be allocated to UE # 2 to simultaneously indicate scheduling request information and HARQ NACK information. have. Therefore, if the base station detects the cyclic index value in the sequence-based sPUCCH received by the base station, if it is 4, it can be confirmed that the UE # 1 has transmitted only the HARQ ACK information. If the 2 is received, And HARQ NACK information at the same time.

In this case, the number of Cyclic Shift Indexes mapped to the scheduling request information and the number of Cyclic Shift Index mapped to HARQ ACK / NACK information may be equal to each other.

For example, in order for the UE to indicate 1-bit HARQ ACK / NACK information, two cyclic shift indices may be mapped. In this manner, when the HARQ ACK / NACK information is 1 bit, the Cyclic Shift Index mapped to indicate the scheduling request information by the UE can be two equal to the number of Cyclic Shift Index mapped to the HARQ ACK / NACK information.

The reason why the number of Cyclic Shift Indexes mapped to indicate the scheduling request information by the UE is equal to the number of Cyclic Shift Indexes mapped to the HARQ ACK / NACK information is to transmit HARQ ACK / NACK information together with scheduling request information It is to piggyback.

If the Cyclic Shift Index mapped to indicate the scheduling request information is one, even if the Node B receives the sPUCCH including the scheduling request information and detects the corresponding Cyclic Shift Index, it can not distinguish the ACK and NACK information from the index. Therefore, there is a problem that the base station must again receive ACK / NACK information through a separate sPUCCH. On the other hand, if there are two cyclic shift indexes that are mapped to indicate scheduling request information, after the base station receives the sPUCCH including the scheduling request information, it determines whether ACK information is transmitted or not based on which index of the two indexes is detected, At the same time.

Also, the UE can set uplink control channels including scheduling request information and HARQ ACK / NACK information based on the resources of the uplink control channel (S510).

Hereinafter, the case where the resource of the uplink control channel is a plurality of cyclic shift indexes will be described as an example.

The UE may transmit an uplink control channel having two or three symbols in the frame structure of a short transmission time interval to the Node B, and the UE may transmit the uplink control channel to the uplink control channel according to the scheduling request information and HARQ ACK / The cyclic shift index value used may vary.

Therefore, when the BS detects the Cyclic Shift Index in the uplink control channel, it can check whether the corresponding uplink control channel includes the scheduling request information or the HARQ ACK / NACK information according to the detected Cyclic Shift Index.

In addition, the UE can transmit an uplink control channel, which is composed of two or three symbols, in one short transmission time interval (sTTI) to the base station (S520). Unlike the conventional LTE TTI, which is composed of 14 symbols (in case of Normal CP) or 12 symbols (in case of Extended CP), in a frame structure of a short transmission time interval, one sTTI is 2, 3 or 7 Symbols. The uplink control channel may also be composed of two or three symbols.

In this case, an uplink control channel composed of two or three symbols can be set using an index allocated to simultaneously indicate scheduling request information and HARQ ACK / NACK information. For example, if the cyclic shift index 0 simultaneously indicates the scheduling request information and the ACK information of the UE # 1, the UE # 1 sets up the UL control channel using the Cyclic Shift Index 0 and transmits it to the BS . Accordingly, the UE # 1 can simultaneously transmit the scheduling request information and the ACK / NACK information to the Node B on one UL control channel.

6 is a diagram illustrating a procedure in which a base station receives an uplink control signal in the present embodiment.

Referring to FIG. 6, the BS transmits information for configuring uplink control channel resources for indicating only HARQ ACK / NACK information and scheduling request information and HARQ ACK / NACK information, (S600). In this case, the resource information of the uplink control channel may be a plurality of cyclic shift indexes.

At this time, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information in the resources of the uplink control channel and the uplink control resources allocated to indicate only the HARQ ACK / The number of channel resources may be the same, and if the HARQ ACK / NACK information is 1 bit, the number of UL control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information may be two have.

Hereinafter, the case where the resource of the uplink control channel is a plurality of cyclic shift indexes will be described as an example.

For example, in the frame structure of the short transmission time interval, only 1RB is basically allocated to the uplink control channel, and a length-12 ZC sequence is allocated to 1RB. Therefore, the maximum number of cyclic shift indexes available on the sequence is limited to 12. Therefore, it is not possible to allocate a cyclic shift index used for transmitting scheduling request information and HARQ ACK / NACK information for all UEs connected to the BS.

 Accordingly, the BS may transmit information for configuring the resource information of the UL control channel to the MS, and each UE may configure the resource information of the UL control channel based on the information. In this case, an example of the information transmitted to the mobile station by the base station may be a cyclic shift period, a position, or an index value that each mobile station can use for a scheduling request. The base station can transmit information necessary for constructing a cyclic shift index to each terminal using RRC or DCI signaling.

In this case, the number of the cyclic shift index mapped to the scheduling request information and the number of the cyclic shift index mapped to the HARQ ACK / NACK information may be the same.

For example, in order for the UE to indicate 1-bit HARQ ACK / NACK information, two cyclic shift indices may be mapped. In this manner, when the HARQ ACK / NACK information is 1 bit, the Cyclic Shift Index mapped to indicate the scheduling request information by the UE can be two equal to the number of Cyclic Shift Index mapped to the HARQ ACK / NACK information.

In addition, the base station can receive an uplink control channel composed of two or three symbols in one sTTI from the terminal (S610).

When the UE transmits scheduling request information or transmits HARQ ACK / NACK information to the Node B, the UE generates scheduling request information and HARQ ACK / NACK information based on information for configuring uplink control channel resource information received from the Node B The uplink control channel including the uplink control channel can be set. At this time, the uplink control channel may be composed of two or three symbols.

In addition, the base station may detect the scheduling request information and the HARQ ACK / NACK information from the received uplink control channel (S620).

For example, the base station can detect the cyclic shift index value from the received uplink control channel. The base station can recognize the UE transmitting the uplink control channel based on the detected cyclic shift index value, and can confirm the scheduling request information and HARQ ACK / NACK information transmitted by the UE.

The sTTI structure has a similar structure of downlink and uplink based on 2-symbol and 7-symbol. This structure is finally determined, and at this time, the slot boundary of each subframe is maintained. That is, there is no sTTI over the slot 0 and slot 1 of the subframe.

7 is a diagram showing an sTTI composed of two or three symbols in the downlink.

Referring to FIG. 7, one subframe may be composed of six sTTIs sTTI0, sTTI1, sTTI2, sTTI3, sTTI4 and sTTI5. In order to maintain the slot boundary of each subframe, sTTI0 and sTTI5 are composed of three symbols, and sTTI1, sTTI2, sTTI3 and sTTI4 may be composed of two symbols.

The downlink control channel is present in the frontmost part of the subframe and the downlink control channel may be composed of one to three symbols. If the downlink control channel is composed of one symbol, it is located in the first symbol of sTTIO. If the downlink control channel is composed of two symbols, it is located in the first symbol and the second symbol of sTTIO. If the downlink control channel is composed of three symbols, .

8 is a diagram showing an sTTI composed of two or three symbols in the uplink.

Referring to FIG. 8, one subframe may be composed of six sTTIs such as sTTI0, sTTI1, sTTI2, sTTI3, sTTI4 and sTTI5 as in FIG. In order to maintain the slot boundary of each subframe, sTTI0 and sTTI5 are composed of three symbols, and sTTI1, sTTI2, sTTI3 and sTTI4 may be composed of two symbols.

Hereinafter, a method of constructing the sPUCCH composed of two or three symbols in the short TTI will be described in comparison with the method of constructing the PUCCH of the existing LTE / LTE-A system.

When HARQ ACK / NACK is transmitted from the PUCCH of the existing LTE / LTE-A system, resource allocation is performed by OCC (spreading) + CS (cyclic shift) based on PUCCH format 1a and 1b.

The HARQ ACK / NACK mapping in the PUCCH of the existing LTE / LTE-A system is basically configured as follows.

For example, if only one bit of information is needed if one ACK / NACK is mapped, symbols can be mapped using BPSK to display two different information. If two ACKs / NACKs are mapped, two bits of information are needed and symbols can be mapped using QPSK to represent four different information.

 On the other hand, unlike the PUCCH of the existing LTE / LTE-A system, the sPUCCH consisting of two or three symbols transmits up to 2 bits of HARQ ACK / NACK information without DMRS. Therefore, instead of mapping symbols using BPSK or QPSK in order to transmit different information, unlike the existing LTE / LTE-A system, HARQ ACK / NACK data is transmitted without a DMRS as a cyclic shift Respectively. That is, a cyclic shift value mapped to transmit 1-bit or 2-bit HARQ ACK / NACK information is derived, and the sPUCCH is configured based on the derived cyclic shift value and the ZC sequence of length-12.

에서 정의되는 순환 시프트값인 α 로 정의된다.The ZC sequence used at this time is basically the RS

Is defined as a cyclic shift value?

Here, it is assumed that the HARQ ACK / NACK information of each terminal is mapped to a different cyclic shift value?. That is, there exists a specific cyclic shift index mapped to HARQ ACK or NACK of each terminal. In this case, when the cyclic shift value is detected in the sPUCCH, it is possible to know which UE has transmitted ACK or NACK information. If the cyclic shift value is mapped to the scheduling request information other than the HARQ ACK / NACK, it is possible to detect whether the UE has transmitted the scheduling request information by detecting the cyclic shift value in the sPUCCH.

Hereinafter, more specific embodiments of a method for transmitting and receiving an uplink control signal between the terminal and the base station will be described in detail. In the following description, the case where the resources of the UL control channel are determined using the cyclic shift index and the HARQ ACK / NACK information is composed of 1 bit will be described as an example. The embodiments described below may be applied individually or in any combination.

Example  1: Single cycle shift  Value is allocated for scheduling request (SR) separately, and the corresponding cycle shift  The value is HARQ ACK / NACK  Cycles defined for shift  Do not overlap values

In order to allocate up to 2 bits of ACK / NACK to the sPUCCH consisting of two symbols, up to four cyclic shift indexes are required for each terminal. As described above, the conventional PUCCH format 1a / 1b uses BPSK (1-bit ACK / NACK) mapping and QPSK (2-bit ACK / NACK) mapping for the symbols, and up to 2-bit A / N transmission using a single cyclic shift value (Application for transmitting A / N information of a maximum of 2 codewords).

However, in the sPUCCH in which the DMRS is not used, there is only a difference in the cyclic shift value as a method for identifying the A / N. Therefore, the A / N must be mapped to different cyclic shift values based on one terminal.

In this proposal, we propose a method to allocate a specific cyclic shift index value for UE in order to transmit scheduling request in this environment. In this case, the following four methods are possible as an embodiment of assigning a specific cyclic shift index value to a terminal.

In the following embodiments, a cyclic shift value is allocated to scheduling request information and HARQ ACK / NACK information for five different UEs UE # 1, UE # 2, UE # 3, UE # 4 and UE # Explain. And the HARQ ACK / NACK information is 1 bit.

In the following table, CS index denotes a cyclic shift index, an Assigned UE denotes a UE indicated by a cyclic shift index, and A / N field denotes A / N information indicated by a cyclic shift index (ACK, N Quot; NACK &quot; or &quot; blank &quot;

Example  1-1. Cycle that does not overlap with each other shift  Assign value to SR purpose

Referring to Table 3, the cyclic shift value 0 of 12 different cyclic shift values is allocated to the scheduling request of the terminal UE # 1 and the cyclic shift value 1 is allocated to the scheduling request of the terminal UE # 2. That is, the cyclic shift value used by the terminal UE # 1 in the scheduling request and the cyclic shift value used by the terminal UE # 2 in the scheduling request do not overlap with each other.

Meanwhile, the remaining cyclic shift values 2 to 11 are allocated for HARQ ACK / NACK information of each UE.

CS index Assigned UE A / N field 0 SR for UE # 1 One SR for UE # 2 2 UE # 1 A 3 N 4 UE # 2 A 5 N 6 UE # 3 A 7 N 8 UE # 4 A 9 N 10 UE # 5 A 11 N

Example  1-2. A cyclic shift value is assigned to a scheduling request purpose so that specific terminals can use it as a contention-based resource type

The fact that terminals use resources in the form of a contention-based resource means that a plurality of terminals share one resource and only one of the terminals can use the resource at a specific point in time.

Referring to Table 4, the cyclic shift value 0 of 12 different cyclic shift values is allocated to the scheduling requests of the UEs UE # 1, UE # 2 and UE # 3, and the cyclic shift value 1 is allocated to the UEs UE # 4 and UE # 5 To the scheduling request. That is, it means that a plurality of UEs can use the cyclic shift values 0 and 1 for the scheduling request. Accordingly, when the cyclic shift value 0 or 1 is detected, the base station configures configuration information for determining which terminal makes a scheduling request, and transmits the configured configuration information to each terminal using RRC or DCI signaling.

Meanwhile, the remaining cyclic shift values 2 to 11 are allocated for HARQ ACK / NACK information of each UE.

CS index Assigned UE A / N field 0 SR for UE # 1, UE # 2, UE # 3 One SR for UE # 4, UE # 5 2 UE # 1 A 3 N 4 UE # 2 A 5 N 6 UE # 3 A 7 N 8 UE # 4 A 9 N 10 UE # 5 A 11 N

Example  1-3. Certain terminals may not overlap each other shift  Value for the purpose of scheduling request, and the rest of the terminals are circulated in the form of a contention-based resource shift  Assign value to SR purpose

Referring to Table 5, the cyclic shift value 0 of 12 different cyclic shift values is allocated to the scheduling request of the terminal UE # 1, and the cyclic shift value 1 is allocated to the scheduling requests of the terminal UE # 2, UE # 3, . That is, it means that only the terminal UE # 1 uses the cyclic shift value of 0 and that a plurality of terminals UE # 2, UE # 3, and UE # 4 can use for the scheduling request. Accordingly, if the cyclic shift value 0 is detected, the BS can determine that the UE # 1 has made the scheduling request. On the other hand, when the cyclic shift value 1 is detected, the base station configures configuration information for identifying which UE has made the scheduling request, and transmits the configured configuration information to each UE using RRC or DCI signaling.

Meanwhile, the remaining cyclic shift values 2 to 11 are allocated for HARQ ACK / NACK information of each UE.

CS index Assigned UE A / N field 0 SR for UE # 1 One SR for UE # 2, UE # 3, UE # 4 2 UE # 1 A 3 N 4 UE # 2 A 5 N 6 UE # 3 A 7 N 8 UE # 4 A 9 N 10 UE # 5 A 11 N

Examples 1-4. If the scheduling request and the A / N transmission occur at the same time, the priority of the scheduling request or A / N is set to drop one

One cyclic shift value may be used to indicate either a scheduling request or an ACK / NACK. Therefore, the UE can not simultaneously transmit the scheduling request and the ACK / NACK in the sPUCCH, and only one of the scheduling request and the ACK / NACK having the higher priority can be transmitted in the sPUCCH. When the base station detects the corresponding cyclic shift value in the sPUCCH, it can check whether it is the scheduling request information or the ACK / NACK information according to the preset priority.

The methods described in Examples 1-1 to 1-4 and Tables 3 to 5 are based on the first symbol of the sPUCCH and the principle of mapping is the same in the second and third symbols forming the linkage, Or the cyclic shift value to be allocated may vary.

In the short transmission time interval structure, since the sPUCCH basically allocates only 1 RB per symbol, if the cyclic shift index is always defined for all the terminals, the number of the available cyclic shift indexes may be insufficient, have.

In practice, a length-12 ZC sequence is assigned to 1RB, and the maximum available cyclic shift value on the sequence is limited to 12. Therefore, in order to allocate the cyclic shift value mapped to the scheduling request, a special setting rule must be applied.

For example, the BS can set information on the cycle, location, and index value to be mapped to the UE using the RRC or DCI signaling for the cyclic shift that each UE can actually use for the scheduling request. (Eg, sub-frame # 2, # 6), sub-frame location Nstti (eg, sTTI index # 1, # 2) n _cs (CS # 1) can be defined and set. Through this method, it is possible to solve the problem of constantly allocating the cyclic shift value for the scheduling request in all the sPUCCH transmission areas for each UE.

Example  2. Multiple cycles shift  Value is separately allocated to a scheduling request, shift  The number of indexes is HARQ ACK / NACK  Cycles defined for shift  Set the number of indexes to be the same and not overlap each other

In this embodiment, when a scheduling request and an HARQ ACK / NACK are simultaneously generated in a UE, it is basically intended to piggyback HARQ ACK / NACK information using a cyclic shift value used for a scheduling request.

That is, when allocating a cyclic shift index for a scheduling request, a plurality of cyclic shift indexes can be allocated to a scheduling request of the UE. As described above, only one cyclic shift index is allocated in order to transmit only scheduling request information. However, in order to piggyback HARQ ACK / NACK information, a cyclic shift index as many as the number of possible ACK / NACK information must be allocated.

For example, if the ACK / NACK to be transmitted by the UE is 1 bit, two cyclic shift index values are allocated for the scheduling request information. If ACK / NACK is 2 bits, four cyclic shift index values are allocated for scheduling request information The HARQ ACK / NACK information may be piggybacked using the cyclic shift value used in the scheduling request. That is, the number of Cyclic Shift Indexes allocated to the scheduling request should be the same as the number of Cyclic Shift Indexes allocated to ACK / NACK. This value may be 2 in 1-bit ACK / NACK and 4 in 2-bit ACK / NACK.

Assuming that the UE transmits a 1 bit A / N using the sPUCCH and allocates the cyclic shift index value for the scheduling request according to the embodiment 2, two UEs are allocated for the UE UE # 3 as shown in Table 6 Cyclic shift indices 0 and 1 are allocated, and two cyclic shift indices 6 and 7 may be allocated for ACK / NACK.

CS index Assigned UE A / N field 0 SR for UE # 3
A One N 2 UE # 1 A 3 N 4 UE # 2 A 5 N 6 UE # 3 A 7 N 8 UE # 4 A 9 N 10 UE # 5 A 11 N

Accordingly, it is possible to implement the principle of simultaneously transmitting scheduling request information and ACK / NACK information. Hereinafter, with reference to Table 6, an embodiment in which UE UE # 3 transmits scheduling request information and ACK / NACK information on one sPUCCH at the same time will be described.

 Step 1: The UE UE # 3 transmits the scheduling request information and the ACK / NACK information for the sPDSCH to the BS through the sPUCCH.

 Step 2: The UE UE # 3 selects the circular shift indexes (CS # 0, # 1) mapped to the scheduling request instead of the circular shift indexes (CS # 6 and # 7) mapped to ACK / ) Or a NACK (CS # 1), maps it to the sPUCCH, and transmits it to the base station. If CS # 6 or # 7 is selected as the cyclic shift index, the BS can check the ACK / NACK information for the UE # 3, but can not confirm the scheduling request information. However, if CS # 0 or CS # 1 is selected, since the base station knows that CS # 0 or CS # 1 is allocated to the scheduling request of terminal UE # 3, it can confirm that it is scheduling request information. Also, since the base station knows that CS # 0 is mapped to ACK and CS # 1 is mapped to NACK, ACK / NACK information can also be checked.

 Step 3: The base station checks the sPUCCH received from the terminal UE # 3, and if the detected cyclic shift value is CS index # 0 or # 1, the scheduling request and ACK are transmitted from the terminal UE # 3 according to the definition of Table 6 (When CS # 0 is detected) or when a scheduling request and an ACK are transmitted from the terminal UE # 3 (when CS # 1 is detected).

Also in the second embodiment, basically, the above-mentioned methods 1-1 to 1-4 of the embodiment 1-1 can be applied to be similar or identical.

Example  2-1. Cycle that does not overlap with each other shift  Assign values for scheduling purposes

Referring to Table 7, the cyclic shift values 0 and 1 among 12 different cyclic shift values are allocated to the scheduling request of the terminal UE # 1. If the cyclic shift value 0 or 1 is detected, the base station can confirm that the scheduling request is sent from the terminal UE # 1. If the cyclic shift value 0 is detected, the UE # 1 transmits an ACK with the scheduling request. If the Cyclic Shift value 1 is detected, the UE # 1 can confirm that the UE # 1 has transmitted a NACK with the scheduling request.

Meanwhile, the remaining cyclic shift values 2 to 11 are allocated for HARQ ACK / NACK information of each UE.

CS index Assigned UE A / N field 0 SR for UE # 1 A One N 2 UE # 1 A 3 N 4 UE # 2 A 5 N 6 UE # 3 A 7 N 8 UE # 4 A 9 N 10 UE # 5 A 11 N

Example  2-2. A cyclic shift value is assigned to a scheduling request purpose so that specific terminals can use it as a contention-based resource type

Referring to Table 8, cyclic shift values 0 and 1 among 12 different cyclic shift values are allocated to scheduling requests of UEs UE # 1, UE # 2 and UE # 3. That is, it means that a plurality of UEs can use the cyclic shift values 0 and 1 for the scheduling request. Accordingly, when the cyclic shift value 0 or 1 is detected, the base station configures configuration information for identifying which of the UEs UE # 1, UE # 2, and UE # 3 simultaneously transmitted the scheduling request and ACK / NACK , And transmits the configured information to each terminal using RRC or DCI signaling.

Meanwhile, the remaining cyclic shift values 2 to 11 are allocated for HARQ ACK / NACK information of each UE.

CS index Assigned UE A / N field 0 SR for UE # 1, UE # 2, UE # 3
A One N 2 UE # 1 A 3 N 4 UE # 2 A 5 N 6 UE # 3 A 7 N 8 UE # 4 A 9 N 10 UE # 5 A 11 N

Example  2-3. Certain terminals may not overlap each other shift  Value for the purpose of scheduling request, and the remaining UEs allocate a cyclic shift value for the SR purpose as a contention-based resource type

Referring to Table 9, the cyclic shift values 0 and 1 among the 12 different cyclic shift values are allocated to the scheduling request of the terminal UE # 1, and the cyclic shift values 2 and 3 are allocated to the terminal UE # 2, UE # 3, To the scheduling request. That is, only the UE # 1 uses the cyclic shift values 0 and 1 and the UEs UE # 2, UE # 3 and UE # 4 can use the scheduling request for the 2 and 3, respectively. Accordingly, if the cyclic shift value 0 or 1 is detected, the base station can determine that the UE # 1 has made the scheduling request. On the other hand, when the cyclic shift value 2 or 3 is detected, the base station configures configuration information for determining which UE has made the scheduling request, and transmits the configured configuration information to each UE using RRC or DCI signaling.

Meanwhile, the remaining cyclic shift values 4 to 11 are allocated for HARQ ACK / NACK information of UEs UE # 1, UE # 2, UE # 3 and UE # 4.

CS index Assigned UE A / N field 0 SR for UE # 1
A One N 2 SR for UE # 2, UE # 3, UE # 4 A 3 N 4 UE # 1 A 5 N 6 UE # 2 A 7 N 8 UE # 3 A 9 N 10 UE # 4 A 11 N

The methods described in Examples 2-1 to 2-3 and Tables 7 to 9 are based on the first symbol of the sPUCCH and the principle of mapping is the same in the second and third symbols forming the linkage, Or the cyclic shift value to be allocated may vary.

In allocating scheduling request resources, the number of cyclic shifts to be allocated is different depending on whether ACK / NACK is 1 bit or 2 bits. In contrast to the case where one cyclic shift index is allocated for each scheduling request independently for each UE, a large number of cyclic shift indexes are always allocated for the scheduling request in advance, CS resources may be lacking.

Therefore, in order to allocate the cyclic shift value mapped to the scheduling request, a special setting rule must be applied.

For example, the BS can set information on the cycle, location, and index value to be mapped to the UE using the RRC or DCI signaling for the cyclic shift that each UE can actually use for the scheduling request. (Eg, sub-frame # 2, # 6), sub-frame location Nstti (eg, sTTI index # 1, # 2) n _cs (CS # 1) can be defined and set. Through this method, it is possible to solve the problem of constantly allocating the cyclic shift value for the scheduling request in all the sPUCCH transmission areas for each UE.

In the present invention, a method for multiplexing and transmitting scheduling request information and HARQ ACK / NACK information through a short PUCCH (short PUCCH) consisting of two symbols in a short transmission time interval is proposed. The method is applied to similar signals and channels But it is not limited to the new frame structure.

10 is a diagram illustrating a configuration of a base station according to the present embodiments.

10, the base station 1000 according to the present embodiment includes a controller 1010, a transmitter 1020, and a receiver 1030.

The controller 1010 detects scheduling request information and HARQ ACK / NACK information from the uplink control channel received from the UE.

As described above, the BS 1000 can detect the Cyclic Shift Index value in the sPUCCH received from the UE, and detect the scheduling request information and the HARQ ACK / NACK information corresponding to the detected index value.

The transmitting unit 1020 and the receiving unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

The transmitter 1020 transmits information for configuring uplink control channel resources for simultaneously indicating uplink control channel resources and scheduling request information and HARQ ACK / NACK information for indicating only HARQ ACK / NACK information to the UE. In this case, for example, the resources of the uplink control channel can be determined using a plurality of cyclic shift indexes.

At this time, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information in the resources of the uplink control channel and the uplink control resources allocated to indicate only the HARQ ACK / The number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is 2 (i.e., 2) if the HARQ ACK / NACK information is composed of 1 bit, .

Hereinafter, the case where the resource of the uplink control channel is a plurality of cyclic shift indexes will be described as an example.

The plurality of cyclic shift indexes may include an index allocated to indicate only HARQ ACK / NACK information, and an index allocated to simultaneously indicate scheduling request information and HARQ ACK / NACK information. As described above, when a Node B detects a Cyclic Shift Index value for simultaneously indicating scheduling request information and HARQ ACK / NACK information in an uplink control channel received from a UE, the UE issues a scheduling request and simultaneously generates HARQ ACK / NACK information And the like.

In this case, in order to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information, the specific cyclic shift index value is set to the number of cyclic shift indexes mapped to the scheduling request information and the cyclic shift index mapped to HARQ ACK / NACK information Should be the same. Since the HARQ ACK / NACK information can be two different information in case of 1 bit and 4 different information in case of 2 bits, the number of cyclic shift index mapped to the scheduling request information is 2 or 4 .

The reason why the number of Cyclic Shift Indexes mapped to indicate the scheduling request information is equal to the number of Cyclic Shift Indexes mapped to the HARQ ACK / NACK information is that the HARQ ACK / NACK information is sent together with scheduling request information . If the cyclic shift index mapped to indicate the scheduling request information is one, even if the base station detects the corresponding cyclic shift index after receiving the sPUCCH including the scheduling request information, it can not distinguish ACK and NACK information from the index. Therefore, there is a problem that the base station must again receive ACK / NACK information through a separate sPUCCH. On the other hand, if there are two cyclic shift indexes that are mapped to indicate scheduling request information, after the base station receives the sPUCCH including the scheduling request information, it determines whether ACK information is transmitted or not based on which index of the two indexes is detected, At the same time.

The receiving unit 1030 receives an uplink control channel composed of two or three symbols in one sTTI from the UE. At this time, one sTTI may be composed of two or three symbols.

11 is a diagram illustrating a configuration of a user terminal according to the present embodiments.

11, the user terminal 1100 according to the present embodiment includes a receiving unit 1110, a control unit 1120, and a transmitting unit 1130.

The receiving unit 1110 receives downlink control information, data, and messages from the base station through the corresponding channel.

The controller 1120 configures uplink control channel resources for simultaneously indicating uplink control channel resources, scheduling request information and HARQ ACK / NACK information for indicating only HARQ ACK / NACK information, and transmits scheduling request information and HARQ ACK / NACK information to the uplink control channel. At this time, the resources of the uplink control channel can be determined using a plurality of cyclic shift indexes.

At this time, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information in the resources of the uplink control channel and the uplink control resources allocated to indicate only the HARQ ACK / The number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is 2 (i.e., 2) if the HARQ ACK / NACK information is composed of 1 bit, .

Hereinafter, the case where the resource of the uplink control channel is a plurality of cyclic shift indexes will be described as an example.

Among the plurality of cyclic shift indexes, an index allocated to simultaneously indicate scheduling request information and HARQ ACK / NACK information may be included. Accordingly, if an uplink control channel using an index allocated to simultaneously indicate scheduling request information and HARQ ACK / NACK information is transmitted to a base station, the base station simultaneously detects scheduling request information and HARQ ACK / NACK information .

At this time, a specific Cyclic Shift Index assigned to simultaneously indicate scheduling request information and HARQ ACK / NACK information may be independently allocated to one UE. However, a plurality of UEs may share a specific Cyclic Shift Index, May be assigned a specific cyclic shift index. If a plurality of UEs are assigned a specific cyclic shift index in a contention-based manner, the Node B must transmit information on which UE is assigned a specific cyclic shift index to each UE through RRC or DCI signaling.

The transmitter 1130 transmits uplink control information, data, and a message to the base station through the corresponding channel.

The transmitter 1130 transmits the uplink control channel, which is composed of two or three symbols, in one sTTI to the base station. At this time, the sTTI may be composed of two or three symbols.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A method for a UE to transmit an uplink control channel,
Configuring an uplink control channel resource for simultaneously indicating uplink control channel resource and scheduling request information and HARQ ACK / NACK information for indicating only HARQ ACK / NACK information;
Setting the uplink control channel including the scheduling request information and the HARQ ACK / NACK information; And
And transmitting the uplink control channel having two or three symbols in one short transmission time interval (sTTI) to a base station.
The method according to claim 1,
Wherein the resources of the uplink control channel include:
Wherein a plurality of cyclic shift indices are used.
The method according to claim 1,
The number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is the same as the number of uplink control channel resources allocated to indicate only the HARQ ACK / NACK information. Way.
The method of claim 3,
Wherein the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is two when the HARQ ACK / NACK information is composed of one bit.
The method according to claim 1,
The uplink control channel, which includes the scheduling request information and HARQ ACK / NACK information,
The HARQ ACK / NACK information indicating the scheduling request information and the HARQ ACK / NACK information.
A method for a base station to receive an uplink control channel,
Transmitting information for configuring uplink control channel resources for simultaneously indicating uplink control channel resources and scheduling request information and HARQ ACK / NACK information for indicating only HARQ ACK / NACK information to a mobile station;
The method comprising: receiving, from the terminal, the uplink control channel having two or three symbols in one short transmission time interval (sTTI); And
And detecting scheduling request information and HARQ ACK / NACK information from the uplink control channel.
The method according to claim 6,
Wherein the resources of the uplink control channel include:
Wherein a plurality of cyclic shift indices are used.
The method according to claim 6,
The number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is the same as the number of uplink control channel resources allocated to indicate only the HARQ ACK / NACK information. Way.
9. The method of claim 8,
Wherein the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is two when the HARQ ACK / NACK information is composed of one bit.
The method according to claim 6,
The uplink control channel, which includes the scheduling request information and HARQ ACK / NACK information,
The HARQ ACK / NACK information indicating the scheduling request information and the HARQ ACK / NACK information.
A terminal for transmitting an uplink control channel,
An uplink control channel resource for simultaneously indicating uplink control channel resource and scheduling request information and HARQ ACK / NACK information for indicating only HARQ ACK / NACK information, and includes scheduling request information and HARQ ACK / NACK information A control unit for setting up the uplink control channel; And
And a transmitter for transmitting the uplink control channel, which is composed of two or three symbols, in one short transmission time interval (sTTI) to a base station.
12. The method of claim 11,
Wherein the resources of the uplink control channel include:
Wherein the index is determined using a plurality of cyclic shift indices.
12. The method of claim 11,
The number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is the same as the number of uplink control channel resources allocated to indicate only the HARQ ACK / NACK information. Terminal.
14. The method of claim 13,
Wherein the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is 2 when the HARQ ACK / NACK information comprises 1 bit.
12. The method of claim 11,
The uplink control channel, which includes the scheduling request information and HARQ ACK / NACK information,
The HARQ ACK / NACK information indicating the scheduling request information and the HARQ ACK / NACK information.
A base station for receiving an uplink control channel,
A transmitter for transmitting uplink control channel resources for indicating only HARQ ACK / NACK information and information for configuring uplink control channel resources for simultaneously indicating scheduling request information and HARQ ACK / NACK information;
A receiver for receiving the uplink control channel from the terminal, the uplink control channel being composed of two or three symbols in one short transmission time interval (sTTI);
And a controller for detecting scheduling request information and HARQ ACK / NACK information from the uplink control channel.
17. The method of claim 16,
Wherein the resources of the uplink control channel include:
Wherein the base station is determined using a plurality of cyclic shift indices.
17. The method of claim 16,
The number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is the same as the number of uplink control channel resources allocated to indicate only the HARQ ACK / NACK information. Base station.
19. The method of claim 18,
Wherein the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and the HARQ ACK / NACK information is two when the HARQ ACK / NACK information is composed of one bit.
17. The method of claim 16,
The uplink control channel, which includes the scheduling request information and HARQ ACK / NACK information,
The HARQ ACK / NACK information is set using uplink control channel resources simultaneously indicating the scheduling request information and the HARQ ACK / NACK information.

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