KR102156670B1 - Methods for multiplexing scheduling request and HARQ ACK/NACK while transmitting and receiving PUCCH and Apparatuses thereof - Google Patents

Abstract

The present embodiments relate to a method of multiplexing and transmitting/receiving scheduling request information and HARQ ACK/NACK information through an sPUCCH (short PUCCH) composed of two or three symbols when transmitting an uplink control channel.In one embodiment, a terminal In the method for transmitting the uplink control channel, 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 HARQ ACK/NACK information , Configuring an uplink control channel including scheduling request information and HARQ ACK/NACK information, and transmitting an uplink control channel consisting of two or three symbols in one short transmission time interval (sTTI) to a base station It provides a method and apparatus comprising the steps of.

Description

A method and apparatus for multiplexing a scheduling request and HARQ ACK/NACK information during transmission and reception of an uplink control channel TECHNICAL FIELD [Methods for multiplexing scheduling request and HARQ ACK/NACK while transmitting and receiving PUCCH and Apparatuses thereof]

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

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

The frame structure of such a short transmission time interval constitutes a frame in units of 2, 3 or 7 symbols in the existing LTE/LTE-Advanced frame structure, that is, TTI=1ms=14/12 OFDM symbols, and a short transmission time Data is transmitted/received based on the frame structure of the interval to reduce delay and improve data throughput.

To this end, a discussion on the performance of short TTI is in progress, and discussions on the feasibility and performance of a TTI length between 0.5ms and one OFDM symbol, and maintaining backward compatibility are underway.

In the above-described study on the physical layer of short TTI, sequenced-based short PUCCH (sPUCCH) transmission was determined. The sequence-based sPUCCH is an uplink control channel (PUCCH) composed of 2 or 3 symbols and is characterized in that no DMRS is used. However, a specific method for transmitting not only HARQ ACK/NACK (hereinafter referred to as'A/N' or'ACK/NACK') information as well as scheduling request (SR) information using the current sequence-based sPUCCH Discussion is ongoing.

The object of the present embodiments is to provide a specific operation method of a terminal and a base station for multiplexing and transmitting/receiving scheduling request information and HARQ ACK/NACK information through an sPUCCH composed of two or three symbols when transmitting and receiving an uplink control channel. Have.

An embodiment devised to solve the above problem is a method for a UE to transmit an uplink control channel, 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 resource for indicating at the same time, configuring an uplink control channel including scheduling request information and HARQ ACK/NACK information, and two or three in one short transmission time interval (sTTI) It provides a method comprising the step of transmitting an uplink control channel consisting of a number of symbols to a base station.

In addition, in an embodiment, in a method for a base station to receive an uplink control channel, an uplink control channel resource for indicating only HARQ ACK/NACK information and scheduling request information and an uplink for simultaneously indicating HARQ ACK/NACK information Transmitting information for configuring control channel resources to a terminal, receiving an uplink control channel composed of two or three symbols from the terminal in one short transmission time interval (sTTI), and an uplink control channel It provides a method comprising the step of detecting scheduling request information and HARQ ACK / NACK information from.

In addition, in an embodiment, in a UE transmitting an uplink control channel, an uplink control channel resource for indicating only HARQ ACK/NACK information and scheduling request information and an uplink control channel for simultaneously indicating HARQ ACK/NACK information A control unit for configuring a resource and setting an uplink control channel including scheduling request information and HARQ ACK/NACK information, and an uplink control channel consisting of two or three symbols in one short transmission time interval (sTTI). It provides a terminal comprising a transmitter for transmitting to the base station.

In addition, in an embodiment, in a base station receiving an uplink control channel, an uplink control channel resource for indicating only HARQ ACK/NACK information and scheduling request information and an uplink control channel for simultaneously indicating HARQ ACK/NACK information A transmitter that transmits information for configuring resources to a terminal, a receiver that receives an uplink control channel consisting of two or three symbols in one short transmission time interval (sTTI) from a terminal, and a scheduling request from an uplink control channel It provides a base station comprising a control unit for detecting information and HARQ ACK / NACK information.

The present embodiments described above provide a specific method for multiplexing and transmitting/receiving scheduling request information and HARQ ACK/NACK information through an sPUCCH composed of two or three symbols when a UE and a base station transmit and receive an uplink control channel. I can.

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

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

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

In other words, in this specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category/type that performs an LTE-based MTC-related operation. Alternatively, in this specification, the MTC terminal supports improved coverage compared to the existing LTE coverage, or the UE category/type defined in the existing 3GPP Release-12 or lower supporting low power consumption, or a newly defined Release-13 low cost (or low complexity) may mean UE category/type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice and packet data. The wireless communication system includes a user terminal (User Equipment, UE) and a base station (Base Station, BS, or eNB). A user terminal in the present specification is a generic concept that refers to a terminal in wireless communication, as well as UE (User Equipment) in WCDMA, LTE, and HSPA, as well as MS (Mobile Station), UT (User Terminal), and SS in GSM. It should be interpreted as a concept that includes all of (Subscriber Station) and wireless devices.

A base station or cell generally refers to a station that communicates with a user terminal, and a Node-B, an evolved Node-B (eNB), a sector, a site, and a BTS ( 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 cell is a comprehensive meaning representing some areas or functions covered by a base station controller (BSC) in CDMA, Node-B in WCDMA, an eNB or sector (site) in LTE, etc. It should be interpreted as, and it means to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

In the various cells listed above, since there is a base station controlling each cell, the base station can be interpreted in two meanings. i) In relation to the radio region, it may be the device itself that provides a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, or a small cell, or ii) the radio region itself may be indicated. In i), all the devices that are controlled by the same entity that provide a predetermined wireless area are controlled by the same entity, or all devices that interact to form the wireless area in collaboration are instructed to the base station. The eNB, RRH, antenna, RU, LPN, point, transmission/reception point, transmission point, reception point, etc., according to the configuration method of the radio area, are an embodiment of the base station. In ii), from the viewpoint of the user terminal or the viewpoint of a neighboring base station, the radio region itself to receive or transmit a signal may be indicated to the base station.

Therefore, megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, LPN (Low Power Node), point, eNB, transmission/reception point, transmission point, and reception point are collectively referred to as a base station. do.

In the present specification, a user terminal and a base station are two transmitting and receiving subjects used to implement the technology or technical idea described in the present specification, and are used in a comprehensive sense, and are not limited by terms or words specifically referred to. The user terminal and the base station are two (Uplink or Downlink) transmitting/receiving subjects used to implement the technology or technical idea described in the present invention, and are used in a comprehensive sense and are not limited by terms or words specifically referred to. Here, the uplink (Uplink, UL, or uplink) refers to a method of transmitting and receiving data to the base station by the user terminal, and the downlink (Downlink, DL, or downlink) is transmitting and receiving data to the user terminal by the base station. It means the way to do it.

There are no restrictions on multiple access techniques applied to wireless communication systems. Various multiple access techniques 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-TDMA, and OFDM-CDMA You can use An embodiment of the present invention can be applied to resource allocation in asynchronous wireless communication that evolves to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication that evolves to CDMA, CDMA-2000 and UMB. The present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention may be applied.

For uplink transmission and downlink transmission, a Time Division Duplex (TDD) scheme transmitted using different times may be used, or a Frequency Division Duplex (FDD) scheme transmitted using different frequencies may be used.

In addition, in systems such as LTE and LTE-Advanced, standards are configured by configuring uplink and downlink based on one carrier or carrier pair. Uplink and downlink are PDCCH (Physical Downlink Control CHannel), PCFICH (Physical Control Format Indicator CHannel), PHICH (Physical Hybrid ARQ Indicator CHannel), PUCCH (Physical Uplink Control CHannel), EPDCCH (Enhanced Physical Downlink Control CHannel), etc. Control information is transmitted through the same control channel, and data is transmitted through a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

Meanwhile, control information can also be transmitted using an enhanced PDCCH or extended PDCCH (EPDCCH).

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

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

The multiple transmission/reception points are at least one that has a high transmission power or low transmission power within a macro cell area, which is wired controlled by being connected to a base station or macro cell (hereinafter referred to as'eNB') and an eNB by an optical cable or optical fiber. It may be the RRH of.

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

Hereinafter, a situation in which signals are transmitted/received through channels such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH may be expressed in the form of'transmitting and receiving PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH'.

In addition, hereinafter, a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used to mean including transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may refer to PDCCH or EPDCCH, and is also used to include both PDCCH and EPDCCH.

In addition, for convenience of explanation, an EPDCCH, which is an embodiment of the present invention, may be applied to a portion described as a PDCCH, and a PDCCH may be applied to a portion described as an EPDCCH as an embodiment of the present invention.

Meanwhile, high layer signaling described below includes RRC signaling that transmits RRC information including RRC parameters.

The eNB performs downlink transmission to the terminals. The eNB is a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and downlink control information such as scheduling required for reception of the PDSCH and an uplink data channel (e.g. For example, a physical downlink control channel (PDCCH) for transmitting scheduling approval information for transmission in a physical uplink shared channel (PUSCH) may be transmitted. Hereinafter, transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

An embodiment of the present invention is used in resource allocation in asynchronous wireless communication evolving to LTE/LTE-Advanced, IMT-2020 through GSM, WCDMA, HSPA, and synchronous wireless communication field evolving to CDMA, CDMA-2000 and UMB. Can be applied.

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

In other words, in this specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category/type that performs an LTE-based MTC-related operation. Alternatively, in this specification, the MTC terminal supports improved coverage compared to the existing LTE coverage, or the UE category/type defined in the existing 3GPP Release-12 or lower supporting low power consumption, or a newly defined Release-13 low cost (or low complexity) may mean UE category/type. Or, it may mean a further enhanced MTC terminal defined in Release-14.

In the present specification, a NB-IoT (NarrowBand Internet of Things) terminal means a terminal that supports wireless access for cellular IoT. The objectives of the NB-IoT technology include improved indoor coverage, support for large-scale low-speed terminals, low latency sensitivity, ultra-low cost terminals, low power consumption, and an optimized network structure.

As representative usage scenarios in New Radio (NR), which is currently being discussed in 3GPP, eMBB (enhanced mobile broadband), mMTC (massive machine type communication), and URLLC (Ultra Reliable and Low Latency Communication) have been proposed.

In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, and various messages related to NR (New Radio) Can be interpreted as a meaning used in the past or present, or in various meanings used in the future.

Latency reduction

There is a discussion on latency reduction. The main purpose of latency reduction is to standardize the operation of shorter transmission time intervals (hereinafter, referred to as'short TTI' or'sTTI') in order to improve the throughput of TCP.

Potential impacts and research are being conducted in the following range.

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

o It is compatible with the existing system and must support the operation of terminals prior to Rel 13 in the same carrier. (backwards compatibility shall be preserved (thus allowing normal operation of pre-Rel 13 UEs on the same carrier))

Latency reduction can be achieved by the following physical layer techniques.

-Short transmission time interval (short TTI)

-Reduced processing time in implementation

-New frame structure of TDD

In addition to the delay reduction, the following discussion is underway.

■ Following design assumptions are considered:

o The short transmission time interval does not exceed the subframe interval (No shortened TTI spans over subframe boundary)

o At least for SIBs and paging, PDCCH and legacy PDSCH are used for scheduling.

■ The potential specific impacts for the followings are studied

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

■ sPDSCH refers to PDSCH carrying data in a short TTI (sPDSCH refers to 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)

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

o The number of supported short TTIs

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

■ Following design assumptions are used for the study.

o From the base station perspective, the existing non-sTTI and sTTI may 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)

■ Additional research on other multiplexing method(s) with existing non-sTTI for UE supporting latency reduction features (FFS)

■ In this study, the following aspects are assumed in RAN1.

o Procedures for 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.)

■ Following aspects are further studied in the next RAN1 meeting.

o Note: But the study is not limited to them.

o Design of sPUSCH DM-RS

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

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

o HARQ for sPUSCH (HARQ for sPUSCH)

■ Whether to recognize asynchronous/synchronous HARQ/how to recognize (Whether/how to realize asynchronous and/or synchronous HARQ)

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

1 is a diagram for explaining processing delays and HARQ Round Trip Time (RTT) in a base station and a terminal.

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

The one-way delay in the LTE user plane for the scheduled UE may consist of a fixed node processing delay and 1 TTI duration for transmission as shown in FIG. 1 below. Assuming that the processing time can be scaled by the same TTI reduction factor maintaining the same number of HARQ processes, the one-way delay can be calculated as follows: (Following the same approach as in section 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.Assuming the processing times can be scaled by the same factor of TTI reduction keeping the same number of HARQ processes, the one way latency can be calculated as)

D = 1.5 TTI (eNB processing and scheduling) + 1 TTI (transmission) + 1.5 TTI (UE processing) + n*8 TTI (HARQ retransmissions)

= (4 + n*8) TTI.

If there may be 0 or 1 retransmissions, and assuming p as the probability of an error occurring in the first transmission, 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.

In UE Calculate the starting average uplink transmission delay (Average UE initiated UL transmission latency calculation)

It is assumed that the UE is in a connected state and in synchronization state and wants uplink transmission such as transmitting a TCP ACK. Table 1 discloses the steps and their contribution to uplink delay. In order to maintain consistency in comparison between downlink and uplink, the eNB adds an eNB processing delay after receiving the uplink data (Step 7) (Assume UE is in connected/synchronized mode and wants to do UL transmission, eg , to send TCP ACK.Following table shows the steps and their corresponding contribution to the UL transmission latency.To be consistent in 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 table above, the half delay of steps 1-4 and 5 is assumed to be due to a scheduling request, and the rest are 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 in values shown in Table 4)

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

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

short At TTI TBS Calculation of short TTI )

According to the resource mapping and transport block size (TBS, Transmit Block Size) calculation formula, the loss rate of the PHY layer for the existing PDSCH may be calculated as follows. (According to the resource mapping and the TBS calculation formula given above, the loss rate of PHY layer for legacy PDSCH is calculated as follows):

For different short TTI durations, the transport block size in the PDSCH of the short TTI may be calculated as shown in Table 2. (For different short TTI duration, The TBS of 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 the PDSCH reception to the base station is the PUCCH. The UE may use a PUCCH format of various formats to transmit Ack/Nack and CQI information for a downlink data channel to the eNB.

In the existing LTE/LTE-Advanced frame structure (TTI=1ms=14 OFDM symbols (Normal CP)/12 OFDM symbols (Extended CP)), slot-based PUCCH hopping as shown in FIG. 3 may be performed. This PUSCH hopping increases the frequency diversity of the PUCCH, and consequently increases the coverage of the PUCCH. This is because there is a gain in which diversity can be obtained by basically transmitting the same signal or one information sequence through different frequency bands.

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

In the present invention, the CS-based A/N multiplexing resource allocation of the Zadoff-Chu (ZC) sequence excluding the conventional OCC is considered in consideration of a decrease in the number of symbols of the sPUCCH. In this case, unlike the existing structure, OCC spreading is not used.

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

It may be defined as a cyclic shift value defined in.

In the present invention, the following basic structure is assumed for the configuration of sPUCCH A/N excluding OCC.

Here, the PUCCH format 1a/b performs dynamic resource allocation. Basically, dynamic allocation as shown in Equation 2 below is performed 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.PUCCH resource index for Ack/Nack here

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

And transmitted from the upper layer

Is determined by From here

In the end, refers to a kind of shift value set so that PUCCH format 1a/1b can be separated from other PUCCH formats 2/3/4.

Additional agreements regarding the recent sTTI are as follows.

■ For sPDSCH/sPDCCH, specify support for a 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, 4-symbol sTTI, and 1-slot sTTI for sPUCCH/sPUSCH, and 1-slot sTTI for sPUCCH/sPUSCH)

o Down-selection is not precluded

■ Study any impact on CSI feedback and processing time, and if needed, specify necessary modifications, if necessary, to study the effect of channel state information on feedback and processing time

o The minimum timing n+3 for FS1, 2 and 3 is supported only for UEs that can shorten the uplink grant for uplink data and the HARQ processing time for downlink data (For FS1,2&3, a minimum timing n+3 is supported for UL grant to UL data and for DL data to DL HARQ for UEs capable of operating with reduced processing time with only the following conditions):

o The maximum TA is reduced to x ms, in which case the x value is less than 0.33ms (A maximum TA is reduced to x ms, where x <= 0.33ms (exact value is derived through detailed research))

o At least when scheduled by PDCCH

o New downlink HARQ and uplink scheduling timing relations are defined for FS2. (For FS2, new DL HARQ and UL scheduling timing relations will be defined)

o Details FFS

o Further research (FFS)

o Possible minimum timing of n+2 TTI

o Further study on max TA in this case (FFS max TA in this case)

o Further study of other restrictions (if any) on when reduced processing times of n+2 could be applied

o Possibility of scheduling by EPDCCH.

o Reduced processing time may be set by RRC in the terminal (Reduced processing time (s) are RRC configured for the UE).

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

Further discussions at later meetings are as follows.

The following operation is applied to control collision of UL grants colliding at n+3 and n+4 timings (Adopt the following behavior for handling the collision of conflicting UL grants with n+3 and n+4 timing).

o The UE does not expect to receive a UL grant colliding with the scheduling PUSCH of the 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 terminal receives a UL grant that collides with the scheduling PUSCH of n+3 and n+4 timings for the same UL subframe of the carrier, the operation of the terminal is handled by the implementation of the terminal (Note: If the UE receives conflicting UL grants with N+3 and N+4 timing scheduling PUSCH for the same UL subframe of a carrier, the UE behavior is left up to UE implementation.)

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

-This does not mean changes to the specification. (Note: This might not imply specification changes)

In addition, the additional decisions made at later meetings are as follows.

o Sequence-based sPUCCH without DMRS is 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 (that is, ACK and NACK are indicated by different cyclic shift indexes.) (ACK/NACK information map to different cyclic shifts (ie, ACK and NACK are indicated) based on cyclic shift index))

-Cyclic shifts of different sPUCCH symbols may be different from each other by cyclic shift randomization. (The cyclic shifts on different sPUCCH symbols can be different due to cyclic shift randomization)

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

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

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

-Additional research: How to handle SR + HARQ, hopping pattern, A/N information mapping to CS (FFS) to map SR + HARQ, hopping pattern and A/N information to cyclic shift

o To be confirmed later

As described above, a study on the physical layer for short TTI is in progress, and sequenced-based sPUCCH (sequenced-based sPUCCH) transmission without DMRS in the 2-symbol sPUCCH was determined. However, there is currently an issue under discussion about a specific method of handling scheduling request information (SR) as well as ACK/NACK information using sPUCCH.

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 may 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 core network entities (AMF: Access and Mobility Function). For convenience of explanation, the base station may represent an eNB of LTE/E-UTRAN below, and a base station (CU, DU, or CU and DU) in a 5G wireless network in which a central unit (CU) and a distributed unit (DU) are separated An entity implemented as a single logical entity), may also represent a gNB.

In addition, the general transmission time interval or the conventional/Legacy time interval described in this specification means a 1ms subframe time interval 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 may be composed of 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, the expression as conventional or general may mean a conventional LTE/LTE-Advanced system in which a subframe is 1 ms.

In addition, the type of the short transmission time interval described in this specification is for distinguishing the symbol length of the TTI in the short transmission time interval, and specifically, the symbol length refers to the number of symbols constituting one short transmission time interval, and It can be 2, 3 or 7.

In addition, the cyclic shift value described in the present specification may mean a cyclic shift index value.

5 is a diagram illustrating a procedure for a terminal to transmit an uplink control signal in this embodiment.

Referring to FIG. 5, a UE may configure 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 HARQ ACK/NACK information (S500). . The terminal may receive information necessary for configuring the resource of the uplink control channel described above from the base station through RRC signaling or DCI signaling.

In this case, the resource of the above-described uplink control channel may be determined using a plurality of cyclic shift indices. Each cyclic shift index may be allocated to indicate scheduling request information or A/N information transmitted by a specific terminal.

For example, cyclic shift index 0 is allocated to indicate scheduling request information of UE #1, cyclic shift index 1 is allocated to indicate ACK information of UE #1, and cyclic shift index 2 is allocated to UE UE It can be allocated to indicate the NACK information of #1. In addition, cyclic shift index 3 may be allocated to indicate ACK information of UE #2, and cyclic shift index 4 may be allocated to indicate NACK information of UE #2. In addition, cyclic shift index 5 may be allocated to indicate ACK information of UE #3, and cyclic shift index 6 may be allocated to indicate NACK information of UE #3.

In a frame structure with a short transmission time interval, a sequence-based sPUCCH may consist of two or three symbols, and a DMRS is not used. Therefore, in order to distinguish which terminal transmits ACK or NACK information without DMRS, ACK/NACK data for each terminal can be configured to be mapped to different cyclic shift indexes of the ZC sequence, respectively. Therefore, when the base station detects the cyclic shift index value in the received sequence-based sPUCCH, it is possible to check which specific terminal has transmitted the ACK or NACK information.

At this time, uplink control allocated to indicate only the number of uplink control channel resources and HARQ ACK/NACK information allocated to simultaneously indicate scheduling request information and HARQ ACK/NACK information in the above-described uplink control channel resource The number of channel resources may be the same, and if HARQ ACK/NACK information is composed of 1 bit, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and HARQ ACK/NACK information is 2 It can be a dog.

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

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

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

In this case, the number of cyclic shift indexes mapped to the scheduling request information and the number of cyclic shift indexes mapped to 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 way, when the HARQ ACK/NACK information is 1 bit, the cyclic shift index mapped to the UE indicating the scheduling request information may be two equal to the number of cyclic shift indexes 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 terminal is equal to the number of cyclic shift indexes mapped to HARQ ACK/NACK information is that HARQ ACK/NACK information is transmitted together with the scheduling request information. To piggyback.

If there is one cyclic shift index mapped to indicate scheduling request information, even if the base station detects the corresponding cyclic shift index after receiving the sPUCCH including the scheduling request information, ACK and NACK information cannot be distinguished by looking at the index. Therefore, there is a problem in that the base station needs to receive ACK/NACK information again through a separate sPUCCH. On the other hand, if there are two cyclic shift indices mapped to indicate scheduling request information, after receiving the sPUCCH including the scheduling request information, the base station has transmitted ACK information or NACK information according to which of the two indexes was detected. It can be determined at the same time whether or not is transmitted.

In addition, the UE may configure an uplink control channel including scheduling request information and HARQ ACK/NACK information based on the above-described uplink control channel resources (S510).

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

The UE can transmit an uplink control channel consisting of two or three symbols in a frame structure of a short transmission time interval to the base station. In this case, the UE can transmit the uplink control channel according to the scheduling request information and HARQ ACK/NACK information to be transmitted. The cyclic shift index value used may be different.

Therefore, when the base station detects the cyclic shift index in the uplink control channel, it can be checked whether the corresponding uplink control channel includes scheduling request information or HARQ ACK/NACK information according to the detected cyclic shift index.

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

In this case, the uplink control channel composed of two or three symbols may be configured using an index allocated to simultaneously indicate scheduling request information and HARQ ACK/NACK information. For example, if cyclic shift index 0 indicates the scheduling request information and ACK information of UE #1 at the same time, UE #1 establishes an uplink control channel using cyclic shift index 0 and transmits it to the base station. I can. Through this, UE #1 can simultaneously transmit scheduling request information and ACK/NACK information to the base station through one uplink control channel.

6 is a diagram illustrating a procedure for a base station to receive an uplink control signal in this embodiment.

6, the base station provides information for configuring an uplink control channel resource for indicating only HARQ ACK/NACK information and scheduling request information and an uplink control channel resource for simultaneously indicating HARQ ACK/NACK information. Can be transmitted to (S600). In this case, the resource information of the above-described uplink control channel may be a plurality of cyclic shift indices.

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

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

For example, in a frame structure with a short transmission time interval, only 1RB is basically allocated to an uplink control channel and a length-12 ZC sequence is allocated to 1RB. Therefore, the maximum number of cyclic shift indices that can be used in a sequence is limited to 12. Therefore, it is not possible to allocate a cyclic shift index used to always transmit scheduling request information and HARQ ACK/NACK information for all terminals connected to the base station.

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

In this case, the number of cyclic shift indexes mapped to the scheduling request information and the number of cyclic shift indexes mapped to 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 way, when the HARQ ACK/NACK information is 1 bit, the cyclic shift index mapped to the UE indicating the scheduling request information may be two equal to the number of cyclic shift indexes mapped to the HARQ ACK/NACK information.

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

When transmitting scheduling request information or HARQ ACK/NACK information to the base station, the terminal provides scheduling request information and HARQ ACK/NACK information based on information for configuring resource information of an uplink control channel received from the base station. The included uplink control channel can be set. In this case, the uplink control channel may consist of two or three symbols.

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

For example, the base station may detect a cyclic shift index value from the received uplink control channel. The base station can know the terminal that has transmitted the uplink control channel based on the detected cyclic shift index value, and can check the scheduling request information and HARQ ACK/NACK information transmitted by the terminal.

The sTTI structure has a structure similar in downlink and uplink based on 2-symbols and 7-symbols. This structure was finally determined, and at this time, the slot boundary of each subframe is maintained as it is. That is, it means that the sTTI spanning slot 0 and slot 1 of the subframe does not exist.

7 is a diagram illustrating an sTTI composed of 2 or 3 symbols in downlink.

Referring to FIG. 7, one subframe may consist of 6 sTTIs of sTTI0, sTTI1, sTTI2, sTTI3, sTTI4, and sTTI5. In order to maintain the slot boundary of each subframe, sTTI0 and sTTI5 may be composed of three symbols, and sTTI1, sTTI2, sTTI3 and sTTI4 may be composed of two symbols.

A downlink control channel exists at the front of the subframe, and the downlink control channel may consist of 1 to 3 symbols. If the downlink control channel is composed of one symbol, it is located in the first symbol of sTTI0. If it is composed of two symbols, it is located in the first symbol and the second symbol of sTTI0. If it is composed of three symbols, the entire sTTI0 constitutes the downlink control channel. Is done.

8 is a diagram showing an sTTI composed of 2 or 3 symbols in uplink.

Referring to FIG. 8, like FIG. 7, one subframe may consist of 6 sTTIs of sTTI0, sTTI1, sTTI2, sTTI3, sTTI4, and sTTI5. In order to maintain the slot boundary of each subframe, sTTI0 and sTTI5 may be composed of three symbols, and sTTI1, sTTI2, sTTI3 and sTTI4 may be composed of two symbols.

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

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

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

For example, if one ACK/NACK is mapped, since only one bit of information is required, a symbol can be mapped using BPSK in order to display two different pieces of information. If two ACK/NACK are mapped, two bits of information are required, and a symbol can be mapped using QPSK in order to display four different pieces of information.

On the other hand, unlike the PUCCH of the existing LTE/LTE-A system, in the sPUCCH composed of 2 or 3 symbols, when transmitting maximum 2 bit HARQ ACK/NACK information, it is transmitted without DMRS. Therefore, unlike the existing LTE/LTE-A system, instead of mapping symbols using BPSK or QPSK to transmit different information, HARQ ACK/NACK data without DMRS as shown in FIG. 9 is a cyclic shift of the ZC sequence. ) Respectively. That is, a cyclic shift value mapped to transmit 1-bit or 2-bit HARQ ACK/NACK information is derived, and an sPUCCH is configured based on the derived cyclic shift value and a ZC sequence of length-12.

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

It is defined as α, which is a cyclic shift value defined in.

Here, a basic structure in which HARQ ACK/NACK information of each terminal is mapped to a different cyclic shift value α is assumed. That is, there is 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 terminal has transmitted ACK or NACK information. And, if the cyclic shift value is mapped to scheduling request information other than HARQ ACK/NACK, it can be known by detecting the cyclic shift value in the sPUCCH whether a terminal has transmitted the scheduling request information.

Hereinafter, more various embodiments of a method for transmitting and receiving an uplink control signal between the terminal and the base station described above will be described in detail. In the embodiment described below, a case in which the resource of the uplink control channel is determined using a cyclic shift index and HARQ ACK/NACK information is configured of 1 bit will be described as an example. The embodiments described below may be applied individually or in any combination.

Example 1: single circulation shift Values are allocated separately for scheduling requests (SR), and their rotation shift Value is HARQ ACK / NACK Cycle defined for shift Set not to overlap with the value

In order to allocate ACK/NACK up to 2 bits to the sPUCCH composed of 2 symbols, up to 4 cyclic shift indices are required for each terminal. As described above, in the existing PUCCH format 1a/1b, BPSK (1bit ACK/NACK) and QPSK (2bit ACK/NACK) mapping are used for symbols, and A/N transmission of up to 2 bits using a single cyclic shift value. (Use for transmitting A/N information of up to 2 codewords) was possible.

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

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

In the following embodiment, as an example, assigning a cyclic shift value to scheduling request information and HARQ ACK/NACK information for five different terminals UE#1, UE#2, UE#3, UE#4, and UE#5. Explain. And it will be described as an example that the HARQ ACK / NACK information is 1 bit.

And in the table below, CS index means a cyclic shift index, an assigned UE means a terminal indicated by a cyclic shift index, and the A/N field is A/N information indicated by the cyclic shift index (if A, ACK, N If it is, it means NACK, if it is blank, it is not indicated).

Example 1-1. Cycles that do not overlap each other for each device shift Assign values for SR purposes

Referring to Table 3, of 12 different cyclic shift values, a cyclic shift value of 0 is allocated to the scheduling request of UE #1, and a cyclic shift value of 1 is allocated to the scheduling request of UE #2. That is, the cyclic shift value used by the terminal UE#1 for the scheduling request and the cyclic shift value used by the terminal UE#2 for 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 terminal.

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. Allocate cyclic shift values for scheduling requests so that specific terminals can use them in the form of contention-based resources

The fact that the terminals use a resource in the form of a contention-based resource means that one resource is shared by a plurality of terminals, and only one of the terminals can use the corresponding resource at a specific time.

Referring to Table 4, of 12 different cyclic shift values, a cyclic shift value of 0 is allocated to the scheduling request of terminals UE#1, UE#2, and UE#3, and a cyclic shift value of 1 is assigned to terminals UE#4 and UE#5. To the scheduling request of That is, for the cyclic shift values 0 and 1, this means that a plurality of terminals can be used for scheduling requests. Accordingly, when a cyclic shift value of 0 or 1 is detected, the base station configures configuration information to determine which terminal has made 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 terminal.

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 do not overlap each other shift Allocate a value for the purpose of scheduling request, and the remaining terminals are circulated in the form of contention-based resources. shift Assign values for SR purposes

Referring to Table 5, of 12 different cyclic shift values, a cyclic shift value of 0 is assigned to a scheduling request of UE #1, and a cyclic shift value of 1 is assigned to a scheduling request of UE #2, UE#3, and UE#4. To allocate. That is, for a cyclic shift value of 0, only terminal UE#1 is used, and for 1, a plurality of terminals UE#2, UE#3, and UE#4 can be used for scheduling requests. Accordingly, when the cyclic shift value of 0 is detected, the base station may determine that the terminal UE#1 has made a scheduling request. On the other hand, when the cyclic shift value 1 is detected, the base station configures configuration information to determine which terminal has made 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 terminal.

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

Example 1-4. If the scheduling request and A/N transmission occur at the same time, drop one by setting the priority among the scheduling request or A/N.

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

The methods described in Examples 1-1 to 1-4 and Tables 3 to 5 are shown on the basis of the first symbol of sPUCCH, and the mapping principle is applied in the same manner to the second and third symbols in which linkage is formed, but practical use Or, the cyclic shift value assigned may be different.

Since sPUCCH basically allocates 1RB per symbol in the short transmission time interval structure, if a cyclic shift index is always separately defined for all terminals, a problem may occur in A/N transmission due to insufficient number of available cyclic shift indexes. have.

In fact, a length-12 ZC sequence is allocated to 1RB, and at this time, the maximum available cyclic shift value in the sequence is limited to 12. Therefore, in order to separately allocate the cyclic shift value mapped to the scheduling request, a special configuration rule must be applied.

For example, the base station may set information on a period, a location, and an index value mapped to a cyclic shift that can be actually used by each terminal for a scheduling request to the terminal by using RRC or DCI signaling. That is, the period is Nt (eg 200 subframe), the burst period Nb (eg 10 subframe), the position Nf (eg subrame #2, #6), the position within the subframe Nstti (eg sTTI index #1, #2), Information such as n _cs (CS#1) can be defined and set. Through this method, it is possible to solve the problem of fixedly allocating a cyclic shift value for scheduling requests in all sPUCCH transmission regions for each terminal.

Example 2. The cycle of revenge shift Value is separately assigned as a scheduling request, and its rotation shift The number of indexes is HARQ ACK / NACK Cycle defined for shift Set equal to the number of indexes and not overlap each other

In the present embodiment, when a scheduling request and HARQ ACK/NACK occur at the same time in a terminal, it is intended to piggyback HARQ ACK/NACK information using a cyclic shift value used in the scheduling request.

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

For example, if ACK/NACK to be transmitted by the UE is 1 bit, two cyclic shift index values are allocated for scheduling request information, and if ACK/NACK is 2 bits, a total of four cyclic shift index values are allocated for scheduling request information. Should be allocated, HARQ ACK/NACK information can be piggybacked using a cyclic shift value used in the scheduling request. That is, the number of cyclic shift indices allocated to the scheduling request and the number of cyclic shift indices allocated to ACK/NACK should be the same, and this value may be 2 for 1-bit ACK/NACK and 4 for 2-bit ACK/NACK.

Assuming that the UE transmits 1 bit A/N using sPUCCH and allocates a cyclic shift index value for the scheduling request according to Example 2, as shown in Table 6, there are two for scheduling request for UE #3. 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

Through this, the principle of simultaneously transmitting scheduling request information and ACK/NACK information can be implemented. Hereinafter, referring to Table 6, an embodiment in which UE#3 transmits scheduling request information and ACK/NACK information simultaneously through one sPUCCH will be described.

Step 1: UE #3 must simultaneously transmit scheduling request information and ACK/NACK information for sPDSCH to the base station through sPUCCH.

Step 2: UE#3 selects the cyclic shift index (CS#0, #1) mapped to the scheduling request instead of the cyclic shift index (CS#6, #7) mapped to the ACK/NACK, and selects the ACK (CS#0). ) Or NACK (CS#1), selects a cyclic shift value, maps to sPUCCH, and transmits it to the base station. If CS #6 or #7 is selected as the cyclic shift index, the base station can check ACK/NACK information for UE #3, but not 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 UE #3, it can confirm that it is the scheduling request information. In addition, since the BS 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 UE #3, and if the detected cyclic shift value is CS index #0 or #1, the scheduling request and ACK are transmitted from UE #3 according to the definition in Table 6. It is determined as a case (when CS#0 is detected) or when a scheduling request and ACK are transmitted from UE #3 (when CS#1 is detected).

Basically, in the second embodiment, the methods 1-4 in the first embodiment 1-1 are similar or the same can be applied.

Example 2-1. Cycles that do not overlap each other for each device shift Assigning values for scheduling purposes

Referring to Table 7, the cyclic shift values 0 and 1 of 12 different cyclic shift values are allocated to the scheduling request of UE #1. When a cyclic shift value of 0 or 1 is detected, the base station may confirm that a scheduling request has been received from UE #1. In addition, when a cyclic shift value of 0 is detected, the base station may confirm that UE #1 transmits an ACK with a scheduling request, and when a cyclic shift value of 1 is detected, UE #1 transmits a NACK along with the scheduling request.

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

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. Allocate cyclic shift values for scheduling requests so that specific terminals can use them in the form of contention-based resources

Referring to Table 8, among 12 different cyclic shift values, cyclic shift values 0 and 1 are allocated to scheduling requests of UE #1, UE #2, and UE #3. That is, for the cyclic shift values 0 and 1, this means that a plurality of terminals can be used for scheduling requests. Therefore, when the cyclic shift value 0 or 1 is detected, the base station configures configuration information to determine which of the UEs UE#1, UE#2, and UE#3 simultaneously transmitted the scheduling request and ACK/NACK, and , The configured configuration information is transmitted 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 terminal.

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 do not overlap each other shift Allocates a value for scheduling request purpose, and allocates a cyclic shift value for SR in the form of contention-based resources to the remaining terminals

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

Meanwhile, the remaining cyclic shift values 4 to 11 are allocated for HARQ ACK/NACK information of 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 shown based on the first symbol of sPUCCH, and the mapping principle is applied in the same manner to the second and third symbols in which linkage is formed, but practical use Or, the cyclic shift value assigned may be different.

In addition, 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 bit. In addition, compared to the case of allocating one cyclic shift index for the purpose of independently mapping a scheduling request for each terminal, a large number of cyclic shift indexes should always be allocated for scheduling requests in advance, so it should be used for A/N transmission. There may be insufficient CS resources to do.

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

For example, the base station may set information on a period, a location, and an index value mapped to a cyclic shift that can be actually used by each terminal for a scheduling request to the terminal by using RRC or DCI signaling. That is, the period is Nt (eg 200 subframe), the burst period Nb (eg 10 subframe), the position Nf (eg subrame #2, #6), the position within the subframe Nstti (eg sTTI index #1, #2), Information such as n _cs (CS#1) can be defined and set. Through this method, it is possible to solve the problem of fixedly allocating a cyclic shift value for scheduling requests in all sPUCCH transmission regions for each terminal.

In the present invention, a method of multiplexing and transmitting/receiving scheduling request information and HARQ ACK/NACK information through sPUCCH (short PUCCH) composed of two symbols in a short transmission time interval is proposed. It can be applied as it is, and its application is not limited only to the new frame structure.

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

Referring to FIG. 10, the base station 1000 according to the present embodiments includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

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

As described above, the base station 1000 may detect a cyclic shift index value in the sPUCCH received from the terminal, and may detect scheduling request information and HARQ ACK/NACK information corresponding to the detected index value.

The transmission unit 1020 and the reception unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention with the terminal.

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

At this time, uplink control allocated to indicate only the number of uplink control channel resources and HARQ ACK/NACK information allocated to simultaneously indicate scheduling request information and HARQ ACK/NACK information in the above-described uplink control channel resource The number of channel resources may be the same, and if HARQ ACK/NACK information is composed of 1 bit, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and HARQ ACK/NACK information is 2 It can be a dog.

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

The plurality of cyclic shift indices 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 the base station detects a cyclic shift index value indicating both scheduling request information and HARQ ACK/NACK information in the uplink control channel received from the terminal, a specific terminal makes a scheduling request and at the same time also provides HARQ ACK/NACK information. You can confirm that you have delivered.

At this time, in order for a specific cyclic shift index value to simultaneously indicate scheduling request information and HARQ ACK/NACK information, as described above, the number of cyclic shift indexes mapped to scheduling request information and a cyclic shift index mapped to HARQ ACK/NACK information The number of must be the same. When the HARQ ACK/NACK information is 1 bit, it can be two different pieces of information, and when it is 2 bit, it can be 4 different pieces of information.Therefore, the number of cyclic shift indexes mapped to the scheduling request information is 2 or 4 Can be.

The reason for making the number of cyclic shift indexes mapped to indicating scheduling request information equal to the number of cyclic shift indexes mapped to HARQ ACK/NACK information is to piggyback HARQ ACK/NACK information together while sending scheduling request information. To do it. If there is one cyclic shift index mapped to indicate scheduling request information, even if the base station detects the corresponding cyclic shift index after receiving the sPUCCH including the scheduling request information, the index cannot be used to distinguish between ACK and NACK information. Therefore, there is a problem in that the base station needs to receive ACK/NACK information again through a separate sPUCCH. On the other hand, if there are two cyclic shift indices mapped to indicate scheduling request information, after receiving the sPUCCH including the scheduling request information, the base station has transmitted ACK information or NACK information according to which of the two indexes was detected. It can be determined at the same time whether or not is transmitted.

The receiver 1030 receives an uplink control channel composed of two or three symbols in one sTTI from the terminal. In this case, one sTTI may consist of two or three symbols.

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

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

The receiver 1110 receives downlink control information, data, and a message from the base station through a corresponding channel.

The control unit 1120 configures 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 HARQ ACK/NACK information, and scheduling request information and HARQ ACK/ The uplink control channel including NACK information is set. In this case, the resource of the above-described uplink control channel may be determined using a plurality of cyclic shift indices.

At this time, uplink control allocated to indicate only the number of uplink control channel resources and HARQ ACK/NACK information allocated to simultaneously indicate scheduling request information and HARQ ACK/NACK information in the above-described uplink control channel resource The number of channel resources may be the same, and if HARQ ACK/NACK information is composed of 1 bit, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and HARQ ACK/NACK information is 2 It can be a dog.

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

Among the plurality of cyclic shift indices, an index allocated to simultaneously indicate scheduling request information and HARQ ACK/NACK information may be included. Therefore, if an uplink control channel using an index allocated to simultaneously indicate scheduling request information and HARQ ACK/NACK information is transmitted to the base station, the base station may detect scheduling request information and HARQ ACK/NACK information at the same time after receiving it. I can.

At this time, one terminal may be independently allocated a specific cyclic shift index allocated to simultaneously indicate scheduling request information and HARQ ACK/NACK information, but a plurality of terminals share a specific cyclic shift index, and contention-based type It may be assigned a specific cyclic shift index with. If a plurality of UEs are assigned a specific cyclic shift index in a contention-based form, the base station 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 a corresponding channel.

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

The standard contents or standard documents mentioned in the above-described embodiments are omitted to simplify the description of the specification and constitute a part of the specification. Accordingly, it should be construed as falling within the scope of the present invention to add the contents of the standard contents and some of the standard documents to the present specification or to describe in the claims.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, 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 interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (20)

In a method for a terminal to transmit an uplink control channel,
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 HARQ ACK/NACK information;
The uplink control channel consisting of two or three symbols in one short transmission time interval (sTTI) and including the scheduling request information and HARQ ACK/NACK information, the scheduling request information and HARQ ACK/NACK information Configuring using uplink control channel resources indicated at the same time; And
Including the step of transmitting an uplink control channel including the scheduling request information and HARQ ACK / NACK information to the base station,
Uplink control channel resources for simultaneously indicating the scheduling request information and HARQ ACK/NACK information,
It is configured using a plurality of cyclic shift indices based on a sequence without DMRS,
The HARQ ACK/NACK information,
Mapping of ACK information and NACK information to different uplink control channel resources among uplink control channel resources for simultaneously indicating the scheduling request information and HARQ ACK/NACK information based on different indexes among the plurality of cyclic shift indexes A method, characterized in that it is configured to be.
delete The method of claim 1,
Characterized in that the number of uplink control channel resources allocated to indicate the scheduling request information and HARQ ACK/NACK information simultaneously and the number of uplink control channel resources allocated to indicate only the HARQ ACK/NACK information are the same Way.
The method of claim 3,
When the HARQ ACK/NACK information is composed of 1 bit, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and HARQ ACK/NACK information is two.
delete In a method for a base station to receive an uplink control channel,
Transmitting information for configuring an uplink control channel resource for indicating only HARQ ACK/NACK information and scheduling request information and an uplink control channel resource for simultaneously indicating HARQ ACK/NACK information to a terminal;
The scheduling request information and HARQ ACK configured using uplink control channel resources consisting of two or three symbols in one short transmission time interval (sTTI) and simultaneously indicating the scheduling request information and HARQ ACK/NACK information Receiving an uplink control channel including /NACK information from the terminal; And
Including the step of detecting scheduling request information and HARQ ACK/NACK information from an uplink control channel including the scheduling request information and HARQ ACK/NACK information,
Uplink control channel resources for simultaneously indicating the scheduling request information and HARQ ACK/NACK information,
It is configured using a plurality of cyclic shift indices based on a sequence without DMRS,
The HARQ ACK/NACK information,
Mapping of ACK information and NACK information to different uplink control channel resources among uplink control channel resources for simultaneously indicating the scheduling request information and HARQ ACK/NACK information based on different indexes among the plurality of cyclic shift indexes A method, characterized in that it is configured to be.
delete The method of claim 6,
The number of uplink control channel resources allocated to indicate the scheduling request information and HARQ ACK/NACK information at the same time and the number of uplink control channel resources allocated to indicate only the HARQ ACK/NACK information are the same. Way.
The method of claim 8,
When the HARQ ACK/NACK information is composed of 1 bit, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and HARQ ACK/NACK information is two.
delete In the terminal for transmitting the uplink control channel,
Configure uplink control channel resources for indicating only HARQ ACK/NACK information and uplink control channel resources for simultaneously indicating scheduling request information and HARQ ACK/NACK information, and two in one short transmission time interval (sTTI) Alternatively, the uplink control channel consisting of three symbols and including the scheduling request information and HARQ ACK/NACK information is configured using an uplink control channel resource indicating the scheduling request information and HARQ ACK/NACK information at the same time. A control unit; And
Including a transmitter for transmitting to the base station an uplink control channel including the scheduling request information and HARQ ACK / NACK information,
Uplink control channel resources for simultaneously indicating the scheduling request information and HARQ ACK/NACK information,
It is configured using a plurality of cyclic shift indices based on a sequence without DMRS,
The HARQ ACK/NACK information,
Mapping of ACK information and NACK information to different uplink control channel resources among uplink control channel resources for simultaneously indicating the scheduling request information and HARQ ACK/NACK information based on different indexes among the plurality of cyclic shift indexes Terminal, characterized in that configured to be.
delete The method of claim 11,
The number of uplink control channel resources allocated to indicate the scheduling request information and HARQ ACK/NACK information at the same time and the number of uplink control channel resources allocated to indicate only the HARQ ACK/NACK information are the same. Terminal.
The method of claim 13,
When the HARQ ACK/NACK information is composed of 1 bit, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and HARQ ACK/NACK information is two.
delete In the base station receiving an uplink control channel,
A transmitter for transmitting information for configuring an uplink control channel resource for indicating only HARQ ACK/NACK information and scheduling request information and an uplink control channel resource for simultaneously indicating HARQ ACK/NACK information to the terminal;
The scheduling request information and HARQ ACK configured using uplink control channel resources consisting of two or three symbols in one short transmission time interval (sTTI) and simultaneously indicating the scheduling request information and HARQ ACK/NACK information A receiver for receiving an uplink control channel including /NACK information from the terminal;
Including a control unit for detecting scheduling request information and HARQ ACK / NACK information from an uplink control channel including the scheduling request information and HARQ ACK / NACK information,
Uplink control channel resources for simultaneously indicating the scheduling request information and HARQ ACK/NACK information,
It is configured using a plurality of cyclic shift indices based on a sequence without DMRS,
The HARQ ACK/NACK information,
Mapping of ACK information and NACK information to different uplink control channel resources among uplink control channel resources for simultaneously indicating the scheduling request information and HARQ ACK/NACK information based on different indexes among the plurality of cyclic shift indexes Base station, characterized in that configured to be.
delete The method of claim 16,
The number of uplink control channel resources allocated to indicate the scheduling request information and HARQ ACK/NACK information at the same time and the number of uplink control channel resources allocated to indicate only the HARQ ACK/NACK information are the same. Base station.
The method of claim 18,
When the HARQ ACK/NACK information is composed of 1 bit, the number of uplink control channel resources allocated to simultaneously indicate the scheduling request information and HARQ ACK/NACK information is two.
delete

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