阅读说明：本技术 基站、终端和通信方法 (Base station, terminal and communication method ) 是由 山本哲矢 铃木秀俊 王立磊 于 2018-01-12 设计创作，主要内容包括：在基站(100)中,控制单元(101),从多个集中确定一个集,其中每个集包括在初始接入期间用于上行链路(UL)控制信道的资源的一个或多个候选,并且从包括在所确定的集中的资源的一个或多个候选中确定一个候选。发送单元(114),通过高层信令将所确定的集指示给终端(200),并通过动态信令来指示所确定的候选。接收单元(116),使用与所确定的集中的所确定的候选相对应的资源来接收UL控制信号。在基站中,为与初始接入有关的一个或多个参数中的每一个参数配置通过高层信令所指示的值与多个集之间的关联。(In a base station (100), a control unit (101) determines a set from a plurality of sets, wherein each set comprises one or more candidates for resources of an uplink (U L) control channel during initial access, and determines one candidate from the one or more candidates for resources comprised in the determined set, a transmitting unit (114) indicates the determined set to a terminal (200) by high layer signaling and indicates the determined candidate by dynamic signaling, a receiving unit (116) receives a U L control signal using resources corresponding to the determined candidate in the determined set, an association between a value indicated by the high layer signaling and the plurality of sets is configured for each of one or more parameters related to the initial access in the base station.)

1. A base station, comprising:

circuitry to determine a set from a plurality of sets, wherein each set comprises one or more candidates for resources of an uplink (U L) control channel during initial access, and to determine a candidate from the one or more candidates comprised in the determined set;

a transmitting unit which indicates the determined one set to a terminal through a higher layer signaling and indicates the determined one candidate to the terminal through a dynamic signaling; and

a receiving unit for receiving U L control signal by using the resource corresponding to the determined candidate in the determined set

Configuring, for each of one or more parameters related to the initial access, an association between a value indicated by the higher layer signaling and the plurality of sets.

2. The base station of claim 1, wherein the one or more parameters related to the initial access comprise a format of the U L control channel.

3. The base station of claim 1, wherein the one or more parameters related to the initial access comprise resources for transmission of message 1 in the initial access.

4. The base station of claim 1, wherein the one or more parameters related to the initial access comprise resources for transmission of message 3 in the initial access.

5. The base station of claim 1, wherein one or some of the one or more parameters related to resources for the U L control channel are included in the determined one set and indicated to the terminal, and a remaining one of the one or more parameters is configured without being indicated to the terminal by the determined one set.

6. The base station of claim 5, wherein:

the remaining one or more of the one or more parameters comprise a format of the U L control channel, and

determining a format of the U L control channel based on a transmission mode of message 2 or message 3 in the initial access.

7. The base station of claim 5, wherein:

the remaining one of the one or more parameters comprises a format of the U L control channel, and

the format of the U L control channel is indicated to the terminal in the initial access by message 4.

8. The base station of claim 5, wherein:

the remaining one of the one or more parameters comprises a format of the U L control channel, and

determining a format of the U L control channel based on a transmission mode of message 4 in the initial access.

9. The base station of claim 5, wherein:

the remaining one of the one or more parameters comprises at least one of a symbol position and a number of symbols within the slot, and

at least one of the symbol position and the number of symbols within the slot is a fixed value.

10. The base station of claim 5, wherein:

the remaining one of the one or more parameters comprises at least one intra-slot symbol position, and

the symbol position within the at least one slot is limited to one or some configurable value.

11. The base station of claim 5, wherein:

the remaining one of the one or more parameters includes a value indicating an on-off status (enable/disable) of the application of frequency hopping, and

the frequency hopping is always applied.

12. The base station of claim 5, wherein:

the remaining one of the one or more parameters comprises a first frequency location after applying frequency hopping, and

the first frequency location is determined based on a second frequency location prior to applying the frequency hopping.

13. The base station of claim 5, wherein:

the remaining one of the one or more parameters includes a frequency location, and

calculating the frequency location based on a cell ID of a cell in which the terminal is located.

14. The base station of claim 5, wherein the format of the U L control channel is determined based on resources to be used for transmission of message 1 in the initial access.

15. The base station of claim 5, wherein the format of the U L control channel is determined based on a format of message 1 in the initial access.

16. The base station of claim 1, wherein the subcarrier spacing of the U L control channel is determined based on a subcarrier spacing during transmission of message 1 or message 3 in the initial access.

17. The base station of claim 1, wherein a subcarrier spacing of the U L control channel is explicitly indicated to the terminal from the base station.

18. A terminal, comprising:

a receiving unit which receives higher layer signaling indicating any of a plurality of sets, wherein each set includes one or more candidates for resources of an uplink (U L) control channel during initial access, and receives dynamic signaling indicating any of the one or more candidates in the set indicated by the higher layer signaling, and

a transmitting unit transmitting a U L control signal using a resource corresponding to a candidate indicated by dynamic signaling among the one or more candidates included in the set indicated by the higher layer signaling, wherein,

configuring, for each of one or more parameters related to the initial access, an association between a value indicated by the higher layer signaling and the plurality of sets.

19. A method of communication, comprising:

determining a set from a plurality of sets, wherein each set comprises one or more candidates for resources of an uplink (U L) control channel during initial access, and determining one candidate from the one or more candidates comprised in the determined set;

indicating the determined one set to the terminal by higher layer signaling and indicating the determined one candidate to the terminal by dynamic signaling; and

receiving a U L control signal using resources corresponding to the determined one of the set of candidates, wherein

Configuring, for each of one or more parameters related to the initial access, an association between a value indicated by the higher layer signaling and the plurality of sets.

20. A method of communication, comprising:

receiving higher layer signaling indicating any of a plurality of sets, wherein each set includes one or more candidates for resources of an uplink (U L) control channel during initial access, and receiving dynamic signaling indicating any of the one or more candidates for the resources, the one or more candidates being included in the set indicated by the higher layer signaling, and

transmitting a U L control signal using a resource corresponding to a candidate indicated by the dynamic signaling among the one or more candidates included in the set indicated by the higher layer signaling, wherein,

configuring, for each of one or more parameters related to the initial access, an association between a value indicated by the higher layer signaling and the plurality of sets.

Technical Field

The present disclosure relates to a base station, a terminal, and a communication method.

Background

With the recent spread of services using mobile broadband, the amount of data traffic in mobile communication has multiplied. Therefore, expanding the data transmission capacity for the upcoming functions has been considered an urgent task. In addition, in the coming years, huge advancements in the internet of things (IoT) are desired that connect any kind of "things" together over the internet. To support the diversification of IoT services, great progress is required not only in data transmission capacity but also in various requirements such as low latency and communication area (coverage). In view of this background, technical development and standardization of the fifth generation mobile communication system (5G) have been conducted, which significantly improves performance and characteristics as compared to the fourth generation mobile communication system (4G).

The third generation partnership project (3GPP) has been developing New Radio access technology (NR: New Radio) that is not necessarily backward compatible with the advanced long term evolution (L TE) in the 5G standardization.

In NR, a terminal (UE: user equipment) transmits a response signal (ACK/NACK: acknowledgement/negative acknowledgement) indicating an error detection result for downlink (D L) data, D L Channel State Information (CSI), and a U L radio resource assignment request (SR: scheduling request) as in L TE to a base station (eNB or gNB) using an uplink (U L) control channel (PUCCH: physical uplink control channel) (for example, see non-patent literature (hereinafter, referred to as "NP L") 1 and NP L2 and 3).

PUCCH resource parameters in NR that have been standardized by 3GPP include symbol position in a slot (hereinafter referred to as intra-slot symbol position), number of symbols in a slot (hereinafter referred to as intra-slot symbol number), frequency position, on or off (on-off) state (enabled/disabled) of application of frequency hopping, and code resources such as cyclic shift sequences or orthogonal codes (see NP L3, for example).

In NR, in order to identify a PUCCH resource for transmitting ACK/NACK for D L data, a method is employed in which a base station indicates a semi-static PUCCH resource set by a UE-specific higher layer signal (e.g., Radio Resource Control (RRC) signaling) and indicates which PUCCH resource of the PUCCH resource set will be actually used via Downlink Control Information (DCI) (e.g., see NP L3) — as described above, the PUCCH resource includes an on-off state (enable/disable) including an intra-slot symbol position, the number of intra-slot symbols, a frequency position, application of frequency hopping, and a code resource such as a cyclic shift sequence or an orthogonal code.

List of citations

Non-patent document

NPL 1

3GPP TS 38.211 V2.0.0, "NR; physical channels and modulation (release 15) ", 12 months in 2017

NPL 2

3GPP TS 38.212 V2.0.0, "NR; multiplexing and channel coding (release 15) ", 12 months in 2017

NPL 3

3GPP TS 38.213 V2.0.0, "NR; physical layer procedure for control (version 15) ", 12 months in 2017

NPL 4

RAN1#91, Chairman's note, 11 months 2017

Disclosure of Invention

In NR, a terminal needs to recognize a parameter related to a PUCCH resource even during initial access in order to transmit ACK/NACK for a message 4 in a Random Access Channel (RACH) procedure as described above, in a method of recognizing a PUCCH resource for transmitting ACK/NACK using a UE-specific higher layer signal (RRC signaling), the method is effective for D L data transmission after RRC connection establishment between a base station and a terminal is completed, and thus the method cannot be used during initial access before RRC connection establishment is completed.

One non-limiting and exemplary embodiment is directed to providing a base station, a terminal and a communication method capable of flexibly allocating PUCCH resources during initial access.

In one general aspect, the technology disclosed herein features a base station including circuitry to determine a set from a plurality of sets, wherein each set includes one or more candidates for resources for an uplink (U L) control channel during initial access and determine one candidate from the one or more candidates included in the determined set, a transmitting unit to indicate the determined one set to a terminal through higher layer signaling and to indicate the determined one candidate to the terminal through dynamic signaling, and a receiving unit to receive a U L control signal using resources corresponding to the determined one candidate in the determined one set, wherein an association between a value indicated through higher layer signaling and the plurality of sets is configured for each of one or more parameters related to initial access.

In another aspect, the technology disclosed herein features a terminal including a receiving unit that receives high layer signaling indicating any of a plurality of sets, wherein each set includes one or more candidates for resources of an uplink (U L) control channel during initial access, and receives dynamic signaling indicating any of the one or more candidates in the set indicated by the high layer signaling, and a transmitting unit that transmits the U L control signal using resources corresponding to a candidate indicated by the dynamic signaling from among the one or more candidates included in the set indicated by the high layer signaling, wherein an association between a value indicated by the signaling high layer and the plurality of sets is configured for each of one or more parameters related to the initial access.

In yet another general aspect, the technology disclosed herein features a method of communicating including determining a set from a plurality of sets, each set including one or more candidates for resources for an uplink (U L) control channel during initial access, and determining one candidate from the one or more candidates included in the determined set, indicating the determined one set to a terminal through higher layer signaling, and indicating the determined one candidate to the terminal through dynamic signaling, and receiving a U L control signal using resources corresponding to the determined one candidate in the determined one set, wherein an association between a value indicated through higher layer signaling and the plurality of sets is configured for each of one or more parameters related to the initial access.

In yet another general aspect, the technology disclosed herein features a method of communicating including receiving high layer signaling indicating any of a plurality of sets, wherein each set includes one or more candidates for resources of an uplink (U L) control channel during initial access, and receiving dynamic signaling indicating any of the one or more candidates for resources, the one or more candidates being included in the set indicated by the high layer signaling, and transmitting the U L control signal using resources corresponding to a candidate indicated by the dynamic signaling among the one or more candidates included in the set indicated by the high layer signaling, wherein an association between a value indicated by the high layer signaling and the plurality of sets is configured for each of one or more parameters related to the initial access.

It should be noted that general or specific embodiments may be implemented as a system, an apparatus, a method, an integrated circuit, a computer program or a storage medium, or any selective combination of a system, an apparatus, a method, an integrated circuit, a computer program and a storage medium.

According to an aspect of the present disclosure, PUCCH resources may be flexibly allocated during initial access.

Other benefits and advantages of the disclosed embodiments will become apparent from the description and drawings. The benefits and/or advantages may be realized and attained by the various embodiments and features of the specification and the drawings individually, and need not be all provided for attaining one or more of such benefits and/or advantages.

Drawings

Fig. 1 is a block diagram showing a part of the configuration of a base station according to embodiment 1;

fig. 2 is a block diagram showing a part of the configuration of a terminal according to embodiment 1;

fig. 3 is a block diagram showing a configuration of a base station according to embodiment 1;

fig. 4 is a block diagram showing a configuration of a terminal according to embodiment 1;

fig. 5 is a sequence diagram showing processing of a base station and a terminal according to embodiment 1;

fig. 6A is a diagram illustrating an example of association between RMSI and PUCCH resource sets;

fig. 6B is a diagram illustrating an example of association between DCI and PUCCH resources;

fig. 6C is a diagram illustrating an example of parameters forming PUCCH resources;

fig. 7A is a diagram illustrating an example of association between RMSI and a PUCCH resource set according to embodiment 1;

fig. 7B is a diagram illustrating an example of association between DCI and a PUCCH resource of PUCCH format 0 according to embodiment 1;

fig. 7C is a diagram illustrating an example of parameters forming PUCCH resources of PUCCH format 0 according to embodiment 1;

fig. 7D is a diagram illustrating an example of association between DCI and a PUCCH resource of PUCCH format 1 according to embodiment 1;

fig. 7E is a diagram illustrating an example of parameters of PUCCH resources forming PUCCH format 1 according to embodiment 1;

fig. 8 is a diagram illustrating a PUCCH format determination method according to modification 1 of embodiment 1;

fig. 9 is a diagram illustrating another PUCCH format determination method according to modification 1 of embodiment 1;

fig. 10 is a diagram showing an example of parameters forming PUCCH resources of PUCCH format 0 according to modification 2 of embodiment 1;

fig. 11 is a diagram illustrating an example of parameters forming PUCCH resources of PUCCH format 1 according to modification 2 of embodiment 1;

fig. 12 is a diagram showing an example of parameters forming PUCCH resources of PUCCH format 0 according to modification 2 of embodiment 1;

fig. 13A is a diagram showing an example of parameters forming PUCCH resources of PUCCH format 0 according to modification 2 of embodiment 1;

fig. 13B is a diagram showing an example of parameters of PUCCH resources forming PUCCH format 1 according to modification 2 of embodiment 1;

fig. 14A is a diagram showing an example of parameters forming PUCCH resources of PUCCH format 0 according to modification 2 of embodiment 1;

fig. 14B is a diagram showing an example of parameters of PUCCH resources forming PUCCH format 1 according to modification 2 of embodiment 1;

fig. 15A is a diagram illustrating an example of association between RMSI and a PUCCH resource set according to embodiment 2;

fig. 15B is a diagram showing an example of association between DCI and a PUCCH resource of message 1(msg.1) resource 0 according to embodiment 2;

fig. 15C is a diagram illustrating an example of parameters of PUCCH resources forming message 1 resource 0 according to embodiment 2;

fig. 15D is a diagram illustrating an example of association between DCI and a PUCCH resource of message 1 resource 1 according to embodiment 2;

fig. 15E is a diagram illustrating an example of parameters of PUCCH resources forming message 1 resource 1 according to embodiment 2;

fig. 16A is a diagram illustrating other examples of parameters of PUCCH resources forming message 1 resource 0 according to embodiment 2;

fig. 16B is a diagram illustrating other examples of parameters of PUCCH resources forming message 1 resource 1 according to embodiment 2;

fig. 17 is a diagram showing a PUCCH format determination method according to a modification of embodiment 2;

fig. 18 is a diagram showing another PUCCH format determination method according to a modification of embodiment 2;

fig. 19A is a diagram illustrating an example of association between RMSI and a PUCCH resource set according to embodiment 3;

fig. 19B is a diagram showing an example of association between DCI and a PUCCH resource of message 3 resource 0 according to embodiment 3;

fig. 19C is a diagram illustrating other examples of parameters of PUCCH resources forming message 3 resource 0 according to embodiment 3;

fig. 19D is a diagram showing an example of association between DCI and a PUCCH resource of message 3 resource 1 according to embodiment 3;

fig. 19E is a diagram illustrating an example of parameters of PUCCH resources forming message 3 resource 1 according to embodiment 3;

fig. 20A is a diagram illustrating an example of parameters of PUCCH resources forming message 3 resource 0 according to embodiment 3; and

fig. 20B is a diagram illustrating an example of parameters of PUCCH resources forming message 3 resource 1 according to embodiment 3.

Detailed Description

Hereinafter, a detailed description will be given of embodiments of the present disclosure with reference to the accompanying drawings.

As described previously, in NR, a terminal needs to recognize a parameter related to PUCCH resources in order to transmit ACK/NACK for message 4 in a RACH procedure during initial access.

In NR, a base station indicates a PUCCH resource set for transmitting ACK/NACK for message 4 to a terminal through a cell-specific or group-specific higher layer signal (e.g., RMSI: remaining minimum system information) (see NP L3). it is preferable that RMSI overhead at this time is as small as possible. to this end, in NR, a payload size available for indicating a PUCCH resource set in RMSI has been set to 4 bits (e.g., see NP L4).

In this regard, the association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 needs to be discussed in detail.

For example, for a PUCCH resource for ACK/NACK of D L data transmission after RRC connection setup is completed, in order to identify the PUCCH resource, a plurality of parameters for a symbol position within a slot, the number of symbols within a slot, a frequency position, a switching state (enable/disable) of application of frequency hopping, and a code resource (such as a cyclic shift sequence or an orthogonal code) need to be configured.

Also, the range of configurable values of each parameter related to PUCCH resources for ACK/NACK of D L data transmission after RRC connection setup is completed is wide, for a symbol position (start position) within a slot, for example, for a slot consisting of 14 symbols, 0 to 13 may be configured, and further, for the number of symbols within a slot, 1 or 2 symbols may be configured for PUCCH format 0 (short PUCCH capable of transmitting 1-bit or 2-bit response signal), and 4 to 14 symbols may be configured for PUCCH format 1 (long PUCCH capable of transmitting 1-bit or 2-bit response signal), furthermore, for a frequency position (PRB index), 0 to 274 may be configured, for application of frequency hopping, a switching state (enable/disable) of the application of frequency hopping may be configured, for code resources, cyclic shift sequence indexes 0 to 11 may be configured for PUCCH format 0, and orthogonal code sequence indexes 0 to 6 may be configured.

Meanwhile, as described above, only 4 bits in the RMSI can be used to indicate a PUCCH resource set for transmitting ACK/NACK for message 4 during initial access (before RRC connection setup is completed.) for this reason, resource allocation as flexible as allocation of PUCCH resources for ACK/NACK for D L data transmission after RRC connection setup is completed cannot be performed.

In this regard, in an aspect of the present disclosure, a description will be given of a method capable of allocating PUCCH resources as flexibly as possible even in a case where only 4 bits are available in RMSI for a PUCCH resource set indicating PUCCH resources before RRC connection setup is completed in NR (e.g., PUCCH resources for transmitting ACK/NACK for message 4).

Hereinafter, each embodiment will be described in detail.

(example 1)

[ communication System overview ]

The communication system according to each embodiment of the present disclosure includes a base station 100 and a terminal 200.

Fig. 1 is a block diagram illustrating a part of a configuration of a base station 100 according to each embodiment of the present disclosure, in the base station 100 shown in fig. 1, a control unit 101 determines one of a plurality of sets (PUCCH resource sets), each of which includes one or more candidates of resources (PUCCH resources) for a U L control channel during initial access, and determines one candidate from among the one or more candidates included in the determined set, a transmission unit 114 indicates the determined set to a terminal 200 through higher layer signaling (e.g., 4 bits in RMSI) and indicates the determined candidate to the terminal 200 through dynamic signaling (e.g., PUCCH resource indicator of DCI), a reception unit 116 receives a U L control signal (e.g., ACK/NACK for message 4) using resources corresponding to the determined candidate in the determined set.

Fig. 2 is a block diagram showing a part of a configuration of a terminal 200 according to each embodiment of the present disclosure, in the terminal 200 shown in fig. 2, a receiving unit 202 receives high layer signaling indicating any of a plurality of sets, each of which includes one or more candidates for resources of a U L control channel during initial access, and receives dynamic signaling indicating any of the one or more candidates included in the indicated set, a transmitting unit 215 transmits a U L control signal (e.g., ACK/NACK for message 4) using resources corresponding to a candidate indicated by the dynamic signaling among the one or more candidates included in the set indicated by the high layer signaling.

In an aspect of the present disclosure, an association between a value (e.g., 4 bits in RMSI) indicated by higher layer signaling and a plurality of sets (PUCCH resource sets) is configured for each parameter related to initial access.

[ configuration of base station ]

Fig. 3 is a block diagram showing the configuration of a base station 100 according to embodiment 1 of the present invention, in fig. 3, the base station 100 includes a control unit 101, a data generation unit 102, a coding unit 103, a retransmission control unit 104, a modulation unit 105, a higher layer control signal generation unit 106, a coding unit 107, a modulation unit 108, a D L control signal generation unit 109, a coding unit 110, a modulation unit 111, a signal assignment unit 112, an Inverse Fast Fourier Transform (IFFT) processor 113, a transmission unit 114, an antenna 115, a reception unit 116, a Fast Fourier Transform (FFT) processor 117, an extraction unit 118, a demodulation unit and/or a decoding unit (hereinafter referred to as demodulation unit/decoding unit) 119, and a determination unit 120.

Control unit 101 determines a PUCCH resource set of PUCCH resources before RRC connection setup is completed, which is to be indicated to terminal 200 (e.g., PUCCH resources to transmit ACK/NACK for message 4). Control section 101 outputs the determined information to higher layer control signal generation section 106.

Furthermore, control unit 101 determines U L resources (i.e., information on actual resource usage to be indicated by the PUCCH resource indicator of DCI) for message 4 of terminal 200 in the PUCCH resource set of the PUCCH resource for transmitting ACK/NACK for message 4 control unit 101 outputs the determined information to D L control information generation unit 109.

The control unit 101 outputs the determined information to the extraction unit 118 so as to correctly receive the signal from the terminal 200.

Further, the control unit 101 determines radio resource allocation for D L data (e.g., message 4) for the terminal 200, and outputs D L resource allocation information indicating resource allocation for D L data to the D L control signal generating unit 109 and the signal assigning unit 112.

The data generation unit 102 generates D L data (e.g., message 4) for the terminal 200 and outputs the D L data to the encoding unit 103.

Encoding section 103 applies error correction encoding to the D L data input from data generation section 102 and outputs the encoded data signal to retransmission control section 104.

During initial transmission, retransmission control section 104 holds (hold) the coded data signal input from coding section 103, and also outputs the coded data signal to modulation section 105. Further, when NACK for a transmitted data signal is input from a determination unit 122, which will be described later, the retransmission control unit 104 outputs the corresponding data held therein to the modulation unit 105. Meanwhile, when ACK for the transmitted data signal is input from the determination unit 122, the retransmission control unit 104 deletes the corresponding data held therein.

Modulation section 105 modulates the data signal input from retransmission control section 104 and outputs the data-modulated signal to signal assignment section 112.

Higher layer control signal generating section 106 generates a control information bit sequence (e.g., RMSI) using the control information (e.g., PUCCH resource set for ACK/NACK of message 4) input from control section 101, and outputs the generated control information bit sequence to encoding section 107.

Coding section 107 applies error correction coding to the control information bit sequence input from higher layer control signal generating section 106, and outputs the coded control signal to modulating section 108.

Modulating section 108 modulates the control signal inputted from encoding section 107 and outputs the modulated control signal to signal assigning section 112.

The D L control signal generating unit 109 generates a control information bit sequence (e.g., DCI) using control information (information on U L resources to be actually used by the terminal 200, and D L resource allocation information) input from the control unit 101 and outputs the generated control information bit sequence to the encoding unit 110 note that the D L control signal generating unit 109 may include a terminal ID of each terminal in the control information for each terminal because the control information may be transmitted to a plurality of terminals.

Encoding section 110 applies error correction encoding to the control information bit sequence input from D L control signal generation section 109, and outputs the encoded control signal to modulation section 112.

Modulating section 111 modulates the control signal input from encoding section 110, and outputs the modulated control signal to signal assigning section 112.

The signal assigning unit 112 maps the data signal input from the modulating unit 105 to the radio resource based on the D L resource allocation information input from the control unit 101. furthermore, the signal assigning unit 112 maps the control signal input from the modulating unit 108 or the modulating unit 111 to the radio resource the signal assigning unit 112 outputs the D L signal to which the signal has been mapped to the IFFT processor 113.

The IFFT processor 113 applies transmission waveform generation processing such as Orthogonal Frequency Division Multiplexing (OFDM) to the signal input from the signal assignment unit 112. The IFFT processor 113 adds a Cyclic Prefix (CP) in the case of OFDM transmission in which a CP (not shown) has been added. The IFFT processor 113 outputs the generated transmission waveform to the transmission unit 114.

The transmission unit 114 applies Radio Frequency (RF) processing such as digital-to-analog (D/a) conversion and/or up-conversion to the signal input from the IFFT processor 113 and transmits the radio signal to the terminal 200 via the antenna 115.

The reception unit 116 applies RF processing such as down-conversion or analog-to-digital (a/D) conversion to the U L signal waveform received from the terminal 200 via the antenna 115, and outputs the resultant reception signal to the FFT processor 117.

The FFT processor 117 applies FFT processing that converts a time domain signal into a frequency domain signal to the U L signal waveform input from the receiving unit 116 the FFT processor 117 outputs the frequency domain signal obtained by the FFT processing to the extracting unit 118.

Extraction unit 118 extracts a radio resource to which ACK/NACK is transmitted from the signal input from FFT processor 117 based on information received from control unit 101 (information on U L resource to be actually allocated to terminal 200), and outputs a component of the extracted radio resource (ACK/NACK) to demodulation unit/decoding unit 119.

Demodulation section/decoding section 119 applies equalization, demodulation, and error correction decoding to the signal input from extraction section 118, and outputs the decoded bit sequence to determination section 120.

Determination section 120 determines whether the ACK/NACK transmitted from terminal 200 indicates ACK or NACK of the transmitted data signal based on the bit sequence input from demodulation section/decoding section 119. Determination section 120 outputs the determination result to retransmission control section 104.

[ configuration of terminal ]

Fig. 4 is a block diagram showing the configuration of a terminal 200 according to embodiment 1 of the present disclosure, in fig. 4, the terminal 200 includes an antenna 201, a receiving unit 202, an FFT processor 203, an extracting unit 204, a D L control signal demodulating unit 205, a higher layer control signal demodulating unit 206, a D L data signal demodulating unit 207, an error detecting unit 208, a controlling unit 209, an ACK/NACK generating unit 210, an encoding unit 211, a modulating unit 212, a signal assigning unit 213, an IFFT processor 214, and a transmitting unit 215.

The reception unit 202 applies RF processing such as down-conversion or analog-to-digital (a/D) conversion to a signal waveform of a D L signal (data signal or control signal) received from the base station 100 via the antenna 201, and outputs the resultant reception signal (baseband signal) to the FFT processor 203.

The FFT processor 203 applies FFT processing for converting a time domain signal into a frequency domain signal to a signal (time domain signal) input from the receiving unit 202. The FFT processor 203 outputs the frequency domain signal obtained by the FFT processing to the extraction unit 204.

Extraction section 204 extracts a D L control signal (DCI) from the signal input from FFT processor 203 based on the control information input from control section 209 and outputs the D L control signal to D L control signal demodulation section 205 furthermore, extraction section 204 extracts an upper layer control signal (e.g., RMSI) and a D L data signal (e.g., message 4) based on the control information input from control section 209 and outputs the upper layer control signal to upper layer control signal demodulation section 206 and the D L data signal to D L data signal demodulation section 207.

The D L control signal demodulation unit 205 blindly decodes the D L control signal input from the extraction unit 204, and when it is determined that the D L control signal is a control signal transmitted for the terminal 200 of the D L control signal demodulation unit 205, the D L control signal demodulation unit 205 demodulates the control signal and outputs the control signal to the control unit 209.

Higher layer control signal demodulation section 206 demodulates the higher layer control signal inputted from extraction section 204 and outputs the demodulated higher layer control signal to control section 209.

D L data signal demodulation section 207 demodulates and/or decodes the D L data signal inputted from extraction section 204, and outputs the decoded signal to error detection section 208.

The error detection unit 208 performs error detection on the D L data input from the D L data signal demodulation unit 207 and outputs an error detection result to the ACK/NACK generation unit 210, further, the error detection unit 208 outputs, as received data, D L data determined to have no error as a result of the error detection.

Further, the control unit 209 calculates radio resource allocation for the D L data signal based on the D L resource allocation information indicated by the control signal input from the D L control signal demodulation unit 205, and outputs information indicating the radio resource allocation acquired by the calculation to the extraction unit 204.

Further, control unit 209 calculates U L resources to be used by terminal 200 (PUCCH resources transmitting ACK/NACK for message 4) by a method to be described later using the higher layer control signal (ACK/NACK PUCCH resource set for message 4 to be indicated by RMSI) input from higher layer control signal demodulation unit 206 and the control signal (information on U L resources to be indicated by DCI) input from D L control signal demodulation unit 205, the information on the U L resources acquired by the calculation being then output to signal assignment unit 213.

ACK/NACK generating section 210 generates ACK/NACK (ACK or NACK) for the received D L data (message 4) based on the error detection result input from error detecting section 208 ACK/NACK generating section 210 outputs the generated ACK/NACK (bit sequence) to encoding section 211.

Encoding section 211 applies error correction encoding to the bit sequence input from ACK/NACK generation section 210, and outputs the encoded bit sequence (ACK/NACK) to modulation section 212.

Modulating section 212 modulates the ACK/NACK input from encoding section 211 and outputs the modulated ACK/NACK to signal assigning section 213.

The signal assigning unit 213 maps the ACK/NACK input from the modulation unit 212 to the radio resource instructed by the control unit 209 the signal assigning unit 213 outputs the U L signal to which the signal has been mapped to the IFFT processor 214.

The IFFT processor 214 applies transmission waveform generation processing such as OFDM to the signal input from the signal assignment unit 213. The IFFT processor 214 adds a Cyclic Prefix (CP) in the case of OFDM transmission in which a CP (not shown) is added. Alternatively, when the IFFT processor 214 is to generate a single carrier waveform, a Discrete Fourier Transform (DFT) processor (not shown) may be added before the signal dispatching unit 213. The IFFT processor 214 outputs the generated transmission waveform to the transmission unit 215.

The transmission unit 215 applies Radio Frequency (RF) processing such as digital-to-analog (D/a) conversion and/or up-conversion to the signal input from the IFFT processor 214, and transmits the radio signal to the base station 100 via the antenna 201.

[ operations of base station 100 and terminal 200 ]

Hereinafter, operations of the base station 100 and the terminal 200 having the above-described configuration will be described in detail.

Fig. 5 shows a processing flow of the base station 100 and the terminal 200 according to embodiment 1.

The base station 100 indicates a synchronization signal (primary synchronization signal (PSS))/(secondary synchronization signal (SSS)) or system information (master information block (MIB))/(system information block (SIB)) (ST101) to the terminal 200. The terminal 200 acquires a synchronization signal or system information (ST 102).

Next, base station 100 determines one PUCCH resource set during initial access from among a plurality of resource sets for terminal 200(ST 103), and transmits RMSI (4 bits) indicating the determined PUCCH resource set to terminal 200(ST 104). The terminal 200 receives RMSI (higher layer signaling) transmitted from the base station 100 and acquires a PUCCH resource set during initial access (ST 105).

The terminal 200 performs an initial access (random access) procedure (or RRC connection setup) with the base station 100, etc. (ST106 to ST 112).

More specifically, the terminal 200 transmits a message 1(PRACH preamble) to the base station 100(ST 106). Base station 100 transmits message 2 as a response to message 1 received in ST106 to terminal 200(ST 107).

Next, the terminal 200 transmits a message 3 for requesting RRC connection to the base station 100(ST 108). Upon receiving message 3 in ST108, base station 100 determines to use information on actual resource usage to be indicated to terminal 200 using DCI in the PUCCH resource set determined in ST103 (ST 109). More specifically, the base station 100 determines one candidate from candidates of PUCCH resources included in the PUCCH resource set determined in ST 103.

The base station 100 indicates information on the determined PUCCH resource and D L control information (DCI) including D L resource allocation information on message 4(D L data) to the terminal 200, and transmits message 4 including information on RRC connection to the terminal 200(ST 110). the terminal 200 receives the DCI and acquires information on resource usage of message 4 and information on resource usage of ACK/NACK of message 4 (ST 111).

Then, terminal 200 transmits ACK/NACK for message 4 to base station 100 using the PUCCH resource identified based on the PUCCH resource set acquired in ST105 and the DCI (PUCCH resource indicator) acquired in ST111 (ST 112).

The processes of the base station 100 and the terminal 200 until the initial access phase have been described so far.

As described in fig. 5, the base station 100 indicates a semi-static PUCCH resource set (PUCCH resource set) related to PUCCH resources to be used for transmission of ACK/NACK for message 4 to the terminal 200 using 4 bits in RMSI (i.e., PUCCH resources before RRC connection setup is completed) (ST 104).

Parameters forming a PUCCH resource set include symbol position within a slot, number of symbols within a slot, frequency position, on-off state (enabled/disabled) of application of frequency hopping, and code resources such as cyclic shift sequences or orthogonal codes. In addition, the PUCCH resource set includes a plurality of PUCCH resources (resource candidates), each of which is defined by a combination of a plurality of parameters. For example, the number of PUCCH resources included in one PUCCH resource set may be 4 or 8. However, the number of PUCCH resources included in one PUCCH resource set is not limited to 4 or 8.

The base station 100 indicates which PUCCH resource among a plurality of PUCCH resources included in the PUCCH resource set is to be actually used by a PUCCH resource indicator included in a D L control signal (DCI) for the scheduling message 4 (ST110) — in the case where the number of PUCCH resources included in the PUCCH resource set is 4, for example, 2 bits of DCI may be used for the PUCCH resource indicator.

The number of DCI bits used for the PUCCH resource indicator is X bits and the number of PUCCH resources included in the PUCCH resource set is greater than 2^XIn case of (2), the base station 100 may implicitly indicate the PUCCH resource except for an explicit indication of the PUCCH resource by the PUCCH resource indicator. As an implicit indication of PUCFor example, for the implicit indication, an identifier of the terminal 200 (C-RNTI: cell radio network temporary identifier or IMSI: international mobile user identifier) or a Control Channel Element (CCE) of a D L control channel (PDCCH: physical downlink control channel) for DCI transmission to the terminal 200 may be used, for example, PUCCH may be implicitly indicated using C-RNTI mod Z, IMSI mod Z, or CCE mod Z, etc. based on the C-RNTI, IMSI, or CCE.

For PUCCH resources to be used for transmitting ACK/NACK for message 4 (i.e., PUCCH resources before RRC connection setup is completed), the use of one of PUCCH formats, PUCCH format 0 (short PUCCH and PUCCH capable of transmitting 1 or 2-bit ACK/NACK) and PUCCH format 1 (long PUCCH capable of transmitting 1 or 2-bit ACK/NACK) (e.g., see NP L4) has been discussed.

In embodiment 1, the association between 4 bits (16 modes) of RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 is distinguished according to the PUCCH format (the association is different between the case of using PUCCH format 0 and the case of using PUCCH format 1).

Fig. 6A shows an example of a case where association between 4 bits (16 patterns) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 is common between PUCCH format 0 and PUCCH format 1. Fig. 6B illustrates an association between 2 bits (4 modes of 0 to 3) of DCI (PUCCH resource indicator) and PUCCH resources (n, x, where x is 0 to 3)) included in the PUCCH resource set (n), where n is 0 to 15) configured in fig. 6A. Further, fig. 6C shows parameters defining the PUCCH resource (n, x) configured in fig. 6B (symbol position a (n, x) within a slot, the number of symbols B (n, x) within a slot, frequency position (before applying frequency hopping) C (n, x), frequency position (after applying frequency hopping) D (n, x), on/off state of application of frequency hopping (enable/disable), code resource (cyclic shift sequence E (n, x), orthogonal code F (n, x))), and PUCCH format of PUCCH resource (n, x). In the case of fig. 6A, the base station may configure 16 PUCCH resource sets for PUCCH format 0 and PUCCH format 1 in total.

Meanwhile, fig. 7A shows an example of association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 according to embodiment 1.

As shown in fig. 7A, association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 is configured for each of PUCCH format 0 and PUCCH format 1. More specifically, in embodiment 1, association between a value indicated by higher layer signaling (4 bits in RMSI) and a plurality of PUCCH resource sets is configured for each PUCCH format.

Fig. 7B shows an association between 2 bits (4 modes of 0 to 3) of DCI (PUCCH resource indicator) for PUCCH format 0 and PUCCH resources (0, n, x), where x is 0 to 3) included in the PUCCH resource set (0, n), where n is 0 to 15 configured in fig. 7A. Further, fig. 7C shows parameters defining PUCCH resources (0, n, x) to be configured in fig. 7B (symbol position a (0, n, x) within a slot, the number of symbols B (0, n, x) within a slot, frequency position (before applying frequency hopping) C (0, n, x), frequency position (after applying frequency hopping) D (0, n, x), on-off state of application of frequency hopping (enable/disable), code resources (cyclic shift sequence E (0, n, x))) for PUCCH format 0. Note that in fig. 7C, the PUCCH format is PUCCH format 0.

Also, fig. 7D shows an association between 2 bits (4 modes of 0 to 3) of DCI (PUCCH resource indicator) and PUCCH resources (1, n, x), where x is 0 to 3) included in the PUCCH resource set (1, n), where n is 0 to 15) configured in fig. 7A, for PUCCH format 1. Further, fig. 7E shows parameters defining PUCCH resources (1, n, x) to be configured in fig. 7D (symbol position a (1, n, x) within a slot, number B (1, n, x) of symbols within a slot, frequency position (before applying frequency hopping) C (1, n, x), frequency position (after applying frequency hopping) D (1, n, x), on-off state (enable/disable) of applying frequency hopping), code resources (cyclic shift sequence E (1, n, x) and orthogonal code F (1, n, x))) for PUCCH format 1. Note that in fig. 7E, the PUCCH format is PUCCH format 1.

As shown in fig. 7A, in embodiment 1, the base station 100 may configure 16 PUCCH resource sets for each of PUCCH format 0 and PUCCH format 1, and may configure 32 PUCCH resource sets in the entire system. More specifically, according to embodiment 1 (fig. 7A), it is possible to increase the number of configurable PUCCH resource sets as compared with the case (fig. 6A) where a PUCCH resource set common to each PUCCH format is configured.

Further, in embodiment 1, association of 4 bits in RMSI with a PUCCH resource set is configured for each PUCCH format. Accordingly, the base station 100 may configure parameters for a PUCCH resource set indicated by 4 bits in the RMSI for each PUCCH format. In PUCCH format 0, for example, orthogonal code F is not used. Therefore, since the base station 100 is not required to indicate the orthogonal code F, the base station 100 can increase the combination of other parameters in the association between 4 bits in the RMSI and the PUCCH resource set by the amount of the orthogonal code F that is not required in the case of fig. 7C.

As described above, according to embodiment 1, even in the case where only 4 bits are available in RMSI for indicating a PUCCH resource set during initial access, each parameter related to a PUCCH resource for transmitting ACK/NACK can be flexibly configured.

(modification 1 of embodiment 1)

In embodiment 1, the association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 is distinguished according to the PUCCH format (the association is different between the case of using PUCCH format 0 and the case of using PUCCH format 1).

In this case, terminal 200 needs to recognize in advance which PUCCH format (PUCCH format 0 (short PUCCH) or PUCCH format 1 (long PUCCH)) is to be used. Hereinafter, a description will be given of a method for terminal 200 to recognize the PUCCH format.

< method 1-1>

Terminal 200 may determine which PUCCH format (which of PUCCH format 0 and PUCCH format 1 is used) to use for transmitting ACK/NACK for message 4 based on the transmission mode of message 2 or message 3 in the RACH procedure shown in fig. 8. Note that fig. 8 shows processing for transmission of a message (ST106 to ST108 and ST110) and transmission of ACK/NACK for message 4 (ST112) in the processing shown in fig. 5.

In the case where the message 2 or the message 3 is slot-based transmission (transmission in slot units) (PDSCH mapping type a), for example, the terminal 200 may use PUCCH format 1 for transmission of ACK/NACK for the message 4, and in the case where the message 2 or the message 3 is non-slot-based transmission (transmission not in slot units) (PDSCH mapping type B or mini slot-based (in mini slot units)), for example, the terminal 200 may use PUCCH format 0 for transmission of ACK/NACK for the message 4.

Accordingly, overhead for indicating a PUCCH format from base station 100 to terminal 200 can be reduced.

< method 1-2>

Terminal 200 may determine which PUCCH format (which of PUCCH format 0 and PUCCH format 1 is used) to use for transmitting ACK/NACK for message 4 based on information explicitly indicated by message 4.

Thus, for example, the base station 100 can dynamically change the PUCCH format according to the operating condition of the terminal 200 at the transmission timing of the message 4.

< methods 1 to 3>

Terminal 200 may determine which PUCCH format to use for transmitting ACK/NACK for message 4 (which of PUCCH format 0 and PUCCH format 1 is used) based on the transmission mode of message 4 in the RACH procedure as shown in fig. 9, and it is noted that fig. 9 shows processing for transmission of a message (ST106 to ST108 and ST110) and transmission of ACK/NACK for message 4 (ST112) in the processing shown in fig. 5.

In the case where the message 4 is slot-based transmission (transmission in slot units) (PDSCH mapping type a), for example, the terminal 200 may use PUCCH format 1 for transmission of ACK/NACK for the message 4, and in the case where the message 4 is non-slot-based transmission (transmission not in slot units) (PDSCH mapping type B), for example, the terminal 200 may use PUCCH format 0 for transmission of ACK/NACK for the message 4.

Accordingly, overhead for indicating the PUCCH format from the base station 100 to the terminal 200 may be reduced, and the base station 100 may dynamically change the PUCCH format.

(modification 2 of embodiment 1)

In embodiment 1, the association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 is distinguished according to the PUCCH format (the association is different between the case of using PUCCH format 0 and the case of using PUCCH format 1).

The base station 100 may configure 16 PUCCH resource sets for each of PUCCH format 0 and PUCCH format 1, as shown in fig. 7A. However, as described above, the parameters defining the PUCCH resource include, for example, a symbol position within a slot, the number of symbols within a slot, a frequency position, an on-off state (enable/disable) of application of frequency hopping, and a code resource (cyclic shift sequence or orthogonal code). Therefore, it is difficult to flexibly configure all parameters (combinations) using 4 bits in the RMSI.

In this regard, in modification 2, one or some of a plurality of parameters related to PUCCH resources for transmitting ACK/NACK for message 4 are indicated to terminal 200 through a PUCCH resource set, and the remaining plurality of parameters are configured without being indicated through the PUCCH resource set. An example of the parameter neither indicated by nor included in the PUCCH resource set through the RMSI may be a value determined by specifications or a value determined by an operation mode when the terminal 200 performs initial access. As described herein, one or some parameters defining PUCCH resources are not indicated and are predetermined so that parameters to be indicated by a PUCCH resource set can be flexibly configured.

Hereinafter, a method for determining a parameter not indicated by PUCCH resources in modification 2 will be described. Note that < methods 2-1 to 2-7> for determining parameters, which will be described below, may be used alone or in combination.

< method 2-1>

For example, in PUCCH format 0 (short PUCCH), one symbol and two symbols may be configured as the number of symbols in a slot. However, the PUCCH transmitting ACK/NACK for message 4 requires robust transmission. In this regard, in method 2-1, the number of symbols for PUCCH format 0 is fixed to two symbols, as shown in fig. 10.

Setting a fixed value for the number of symbols eliminates the need for the base station 100 to indicate the number of symbols within a slot using 4 bits in the RMSI for PUCCH format 0. More specifically, the number of symbols (e.g., parameter B (0, n, x) in fig. 7C) may be removed from the PUCCH resource set (0, n)). Accordingly, the base station 100 may more flexibly configure another parameter to be included in the PUCCH resource set using 4 bits in the RMSI. Further, the terminal 200 can robustly transmit ACK/NACK for the message 4 using two fixed symbols.

Note that PUCCH format 0 is used to achieve low latency initial access in some cases. In these cases, the number of symbols may be fixed to one symbol (not shown) for PUCCH format 0. Thus, low latency can be achieved in the initial access.

< method 2-2>

In PUCCH format 1 (long PUCCH), for example, 11 candidates of 4 to 14 symbols may be configured as the number of symbols in a slot. Using RMSI to indicate all 11 candidates makes it impossible to flexibly configure the remaining parameters. In addition, a PUCCH transmitting ACK/NACK for message 4 requires robust transmission.

In this regard, in method 2-2, the number of symbols is fixed to 14 symbols for PUCCH format 1, as shown in fig. 11.

Setting a fixed value for the number of symbols eliminates the need for the base station 100 to indicate the number of symbols within a slot using 4 bits in the RMSI for PUCCH format 1. More specifically, the number of symbols (e.g., parameter B (0, n, x) in fig. 7E) may be removed from the PUCCH resource set (1, n)). Accordingly, the base station 100 may more flexibly configure another parameter to be included in the PUCCH resource set using 4 bits in the RMSI. In addition, the terminal 200 can robustly transmit ACK/NACK for the message 4 using the fixed 14 symbols.

As shown in fig. 11, when the number of symbols is fixed to 14 symbols at most, the symbol position (start position) in the slot is also fixed to the symbol index 0 (first symbol in the slot). Therefore, in fig. 11, for PUCCH format 1, the base station 100 does not have to indicate not only the number of symbols within a slot (parameter B (1, n, x)) but also the symbol position (i.e., parameter a (1, n, x) shown in fig. 7E) using 4 bits in the RMSI. Thus, the base station 100 may use 4 bits in the RMSI to more flexibly configure another parameter.

Note that in the case where multiple coverage needs to be supported in the initial access, multiple candidates may be configured for the number of symbols. As candidates for the number of symbols, for example, 7 symbols or 10 symbols may be arranged in addition to the above-described 14 symbols.

Note that the number of symbols to be indicated using the RMSI is not limited to 7 symbols, 10 symbols, or 14 symbols, and may be another number of symbols. More specifically, in method 2-2, among 11 candidates configurable as the number of symbols, only one or some candidates may be indicated using RMSI.

In addition, the terminal 200 may implicitly determine the number of symbols of the PUCCH resource based on the slot format indicated by the MIB or the RMSI. In this case, the base station 100 is no longer required to use 4 bits in the RMSI to indicate the number of symbols in the slot (parameter B).

< methods 2 to 3>

For example, in PUCCH format 0 (short PUCCH), candidates of 14 symbol indexes 0 to 13 may be configured as symbol positions in the slot. Using RMSI indicates that all 14 candidates will make it inflexible to configure the remaining parameters.

In this regard, in method 2-3, as shown in fig. 12, for PUCCH format 0, the symbol position (start position) within the slot is fixed to the second symbol (i.e., symbol index 12) from the end of the slot.

Setting a fixed value for the intra-slot symbol position eliminates the need for the base station 100 to use 4 bits in the RMSI to indicate the intra-slot symbol position for PUCCH format 0. More specifically, the symbol position (e.g., parameter a (0, n, x) in fig. 7C) may be removed from the PUCCH resource set (0, n)). Accordingly, the base station 100 may more flexibly configure another parameter to be included in the PUCCH resource set using 4 bits in the RMSI.

In addition, as shown in fig. 12, in the case where the symbol position is fixed to the symbol index 12, the number of symbols within the slot may be configured to be a fixed value (2 symbols). In fig. 12, for PUCCH format 0, the base station 100 does not have to use 4 bits in the RMSI to indicate not only the symbol position within the slot (parameter a (0, n, x)), but also the number of symbols (e.g., parameter B (0, n, x) shown in fig. 7C). Thus, the base station 100 may use 4 bits in the RMSI to more flexibly configure another parameter.

Note that the symbol position to be indicated using the RMSI is not limited to the symbol number 12, but may be another symbol position. More specifically, in method 2-3, among 14 candidates configurable as symbol positions, only one or some candidates may be indicated using RMSI. The symbol position indicated using the RMSI may be, for example, symbol index 13 (last symbol in the slot). Further, in the case where the symbol position is fixed to the symbol index 13, the number of symbols within the slot may be fixed to a fixed value (one symbol).

< methods 2 to 4>

In PUCCH format 1 (long PUCCH), for example, 11 candidates of symbol indexes 0 to 10 may be configured as symbol positions in a slot. Using RMSI indicates that all 11 candidates will make it inflexible to configure the remaining parameters.

In this regard, in methods 2-4, the intra-slot symbol positions are limited to only one or some configurable values (11 candidates) (e.g., one or more symbol positions) for PUCCH format 1 (not shown).

Therefore, in the case of fixing the intra-slot symbol position to one symbol position, for PUCCH format 1, the base station 100 no longer needs to indicate the intra-slot symbol position using 4 bits in the RMSI (parameter a (1, n, x)). Further, in the case where the symbol position is fixed to some symbol positions within the slot, the number of bits required to indicate the symbol position from the base station 100 to the terminal 200 can be reduced. Thus, another parameter can be more flexibly configured using 4 bits in the RMSI.

Note that as described in < method 2-2>, in the case where only 14 symbols are used as the number of symbols, the symbol position is always configured as the symbol number 0. Therefore, the base station 100 no longer needs to indicate the symbol position within the slot in fig. 11 (parameter a (1, n, x)). Further, in the case where 7 symbols are made configurable as the number of symbols, for example, the symbol position may be limited to the symbol number 7. Also in this case, the base station 100 is no longer required to indicate the symbol position within the slot.

< methods 2 to 5>

For example, in PUCCH format 0 (short PUCCH) and PUCCH format 1 (long PUCCH), generally, the on-off state (enable/disable) of application of frequency hopping is configurable (however, there is no application of frequency hopping in case of one symbol of PUCCH format 0). In addition, a PUCCH transmitting ACK/NACK for message 4 requires robust transmission.

In this regard, in methods 2-5, frequency hopping is always applied (enabled) as shown in fig. 13A and 13B. More specifically, the parameter indicating the on-off state (enabled/disabled) of the application of frequency hopping always indicates the on state (enabled). Thus, for PUCCH format 0 (in case of 2 symbols) and PUCCH format 1, the base station 100 no longer needs to use 4 bits in the RMSI to indicate the on-off state (enable/disable) of the application of frequency hopping. More specifically, a value indicating an on-off state (enable/disable) of application of frequency hopping (a value of "frequency hopping" shown in fig. 13A and 13B) may be removed from the PUCCH resource set. Accordingly, the base station 100 may more flexibly configure another parameter to be included in the PUCCH resource set using 4 bits in the RMSI. In addition, the terminal 200 can robustly transmit ACK/NACK for message 4 by applying frequency hopping.

Note that in methods 2-5, it is also possible to configure to not apply frequency hopping at all (always disabled). More specifically, the parameter indicating the on-off state (enable/disable) of the application of frequency hopping may always indicate the off state (disable). Also in this case, for PUCCH format 0 and PUCCH format 1, the base station 100 no longer needs to use 4 bits in the RMSI to indicate the on-off state (enable/disable) of the application of frequency hopping.

< methods 2 to 6>

In case of applying frequency hopping, for example, in PUCCH format 0 (short PUCCH, in case of 2 symbols) and PUCCH format 1 (long PUCCH), PRB indices 0 to 274 may be generally configured to apply a frequency position after frequency hopping (PRB index of the second hop). However, it is difficult to indicate candidates for all PRB indices using RMSI.

In this regard, in methods 2-6, as shown in fig. 14A and 14, a frequency position after applying frequency hopping (PRB index of the second hop) is determined based on a frequency position before applying frequency hopping (PRB index of the first hop) — the frequency position after applying frequency hopping may be configured, for example, as a mirror pattern (pattern) with respect to the frequency position before applying frequency hopping around a band center of an initial U L band (initial uplink BWP: bandwidth part) in which a pucch transmitting ACK/NACK for message 4 is configured in the initial U L band.

Therefore, for PUCCH format 0 (in case of 2 symbols) and PUCCH format 1, the base station 100 no longer needs to use 4 bits in RMSI to indicate the frequency position after applying frequency hopping. More specifically, the frequency position (PRB index of the second hop) may be removed from the PUCCH resource set (parameter D). Accordingly, the base station 100 may more flexibly configure another parameter to be included in the PUCCH resource set using 4 bits in the RMSI.

< methods 2 to 7>

For example, in PUCCH format 0 (short PUCCH) and PUCCH format 1 (long PUCCH), PRB indices 0 to 274 may be configured as frequency positions (PRB indices of the first hop). However, it is difficult to indicate candidates for all PRB indexes using the RMSI.

In this regard, in methods 2-7, the frequency position (PRB index of the first hop) is associated with the initial U L BWP, and the pucch transmitting the ACK/NACK for message 4 is configured in the initial U L BWP.

Therefore, for PUCCH format 0 (in case of 2 symbols) and PUCCH format 1, the base station 100 no longer needs to use 4 bits in the RMSI to indicate the frequency position (PRB index of the first hop), or the number of bits required for indication can be reduced. More specifically, the frequency position (PRB index of the first hop) (parameter C) may be removed from the PUCCH resource set, or the number of candidates for the frequency position may be reduced. Accordingly, the base station 100 may more flexibly configure another parameter to be included in the PUCCH resource set using 4 bits in the RMSI.

(modification 3 of embodiment 1)

PUCCH format 0 and PUCCH format 1 are sequence transmissions using Computer Generated (CG) sequences. Therefore, in the case of assigning different sequences to different cells, inter-cell interference occurs due to the cross-correlation characteristic between the sequences. In order to suppress inter-cell interference, there is a method of using different frequency resources for different cells. In this case, changing the PUCCH frequency resource location of each cell using the cell ID makes it possible to reduce the influence of inter-cell interference.

In this regard, in modification 3, the frequency positions (PRB index of the first hop and/or PRB index of the second hop) of PUCCH format 0 (short PUCCH) and PUCCH format 1 (long PUCCH) are calculated based on the cell ID.

Therefore, the base station 100 no longer needs to use 4 bits in the RMSI to indicate the frequency position, or the number of bits required for the indication can be reduced. More specifically, the frequency position (parameter C or D) may be removed from the PUCCH resource set, or the number of candidates of the frequency position may be reduced. Accordingly, the base station 100 may more flexibly configure another parameter to be included in the PUCCH resource set using 4 bits in the RMSI.

Furthermore, inter-cell interference in PUCCH can be reduced.

(example 2)

The base station and the terminal according to embodiment 2 have a basic configuration common to the base station 100 and the terminal 200 according to embodiment 1, and thus a description will be given when fig. 3 and 4 are combined.

The base station 100 can configure a plurality of resources in the system for the terminal 200 to transmit the message 1 in the RACH procedure. In this regard, in embodiment 2, an association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 (the association is different for different resources) is distinguished according to the resource of message 1 (hereinafter, message 1 resource).

As described in embodiment 1, the base station 100 indicates, to the terminal 200, a PUCCH resource set related to a PUCCH resource to be used for transmitting ACK/NACK for message 4 (i.e., a PUCCH resource before RRC connection setup is completed) using 4 bits in RMSI (ST104 in fig. 5).

As in embodiment 1, the parameters forming the PUCCH resource set include symbol position within a slot, the number of symbols within a slot, frequency position, on-off state (enable/disable) of application of frequency hopping, and code resources such as cyclic shift sequences or orthogonal codes. In addition, the PUCCH resource set includes a plurality of PUCCH resources, each PUCCH resource being defined by a combination of a plurality of parameters. For example, the number of PUCCH resources included in one PUCCH resource set may be 4 or 8. The number of PUCCH resources included in one PUCCH resource set is not limited to 4 or 8.

Also, the base station 100 indicates which PUCCH resource will be actually used among a plurality of PUCCH resources included in the PUCCH resource set through a PUCCH resource indicator included in a D L control signal (DCI) for the scheduling message 4 (ST110 in fig. 5) — in the case where the number of PUCCH resources included in the PUCCH resource set is 4, for example, bits of 2DCI may be used for the PUCCH resource indicator.

The number of DCI bits used for the PUCCH resource indicator is X bits and the number of PUCCH resources included in the PUCCH resource set is greater than 2^XIn case (2), the base station 100 may implicitly indicate the PUCCH resource in addition to the explicit indication of the PUCCH resource by the PUCCH resource indicator. As a function of implicitly indicating PUCCH resources, a method is available in which the base station 100 indicates through a PUCCH resource indicator of DCIFor example, for an implicit indication, PUCCH may be implicitly indicated using C-RNTI mod Z, IMSI mod Z, or CCE mod Z, etc., based on an identifier (C-RNTI or IMSI) of terminal 200 or a CCE of a D L control channel (PDCCH) used for DCI transmission to terminal 200.

Fig. 15A shows an example of association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 according to embodiment 2. As shown in fig. 15A, in embodiment 2, association is made between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 for each of a plurality of message 1 resources (a plurality of resources (two in fig. 15A) are configured) (message 1 resource 0 and message 1 resource 1). More specifically, in embodiment 2, association between a value (4 bits in RMSI) to be indicated by higher layer signaling and a plurality of PUCCH resource sets is configured for each message 1 resource.

Fig. 15B shows an association between 2 bits (4 modes of 0 to 3) of DCI (PUCCH resource indicator) for message 1 resource 0 and a PUCCH resource (0, n, x), where x is 0 to 3) included in the PUCCH resource set (0, n, x) configured in fig. 15A, where n is 0 to 15. Further, fig. 15C shows parameters (symbol position a (0, n, x) within a slot, number of symbols B (0, n, x) within a slot), frequency position (before applying frequency hopping) C (0, n, x), frequency position (after applying frequency hopping) D (0, n, x), on-off state of application of frequency hopping (enable/disable), code resources (cyclic shift sequence E (0, n, x) and orthogonal code F (0, n, x)), and PUCCH format of PUCCH resource (0, n, x)) defined for message 1 resource 0 to be configured in fig. 15B.

Also, fig. 15D shows an association between 2 bits (4 modes of 0 to 3) of DCI (PUCCH resource indicator) for message 1 resource 1 and PUCCH resources (PUCCH resource (1, n, x), where x is 0 to 3) included in the PUCCH resource set (1, n) configured in fig. 15A, where n is 0 to 15. Further, fig. 15E shows parameters (symbol position a (1, n, x) within a slot, number B (1, n, x) of symbols within a slot, frequency position (before applying frequency hopping) C (1, n, x), frequency position (after applying frequency hopping) D (1, n, x), on-off state (enable/disable) of application of frequency hopping), code resources (cyclic shift sequence E (1, n, x) and orthogonal code F (1, n, x)) defining PUCCH resources (1, n, x) to be configured in fig. 15D, and PUCCH format of PUCCH resources (1, n, x) for message 1 resource 1.

For example, in the case where association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 is common regardless of message 1 resources (e.g., see fig. 6A), a base station may configure a total of 16 PUCCH resource sets in the system.

In this regard, according to embodiment 2, for example, since the base station 100 can configure 16 PUCCH resource sets for each message 1 resource, so that N message 1 resources in the entire system can be configured (16 × N) PUCCH resource sets, more specifically, according to embodiment 2 (fig. 15A), the number of configurable PUCCH resource sets can be increased compared to the case where a common PUCCH resource set is configured regardless of the message 1 resource.

As described above, according to embodiment 2, even in the case where only 4 bits are available in RMSI for indicating a PUCCH resource set during initial access, it is possible to flexibly configure parameters related to PUCCH resources for transmitting ACK/NACK.

Meanwhile, the message 1 resource configuration is generally performed in a manner of avoiding inter-cell interference between neighboring cells. For this reason, associating a PUCCH resource set for transmitting ACK/NACK for message 4 with a message 1 resource has an advantage in that inter-cell interference of PUCCH resources for transmitting ACK/NACK for message 4 can be simultaneously avoided.

Further, because of the association between the message 1 resource and the PUCCH resource for transmitting ACK/NACK for the message 4, for example, the frequency position (PRB number) of the PUCCH resource for transmitting ACK/NACK for the message 4 can be determined with reference to the frequency resource of the message 1 (PRB of the message 1) as shown in fig. 16A and 16B.

(modification of embodiment 2)

In embodiment 2, the base station 100 may configure 16 PUCCH resource sets for each message 1 resource. However, for example, as described above, the parameters defining the PUCCH resource include a symbol position within a slot, the number of symbols within a slot, a frequency position, an on-off state (enable/disable) of application of frequency hopping, and a code resource (cyclic shift sequence or orthogonal code). For this reason, it is difficult to flexibly configure all parameters (combinations) using 4 bits in the RMSI.

In this regard, in the modification of embodiment 2, for a plurality of parameters defining PUCCH resources for transmitting ACK/NACK for message 4, as in < methods 2-1 to 2-7> in modification 2 of embodiment 1, one or some of the plurality of parameters is indicated to terminal 200 through a PUCCH resource set, and the remaining parameters of the plurality of parameters are configured without being indicated through the PUCCH resource set.

Also, regarding the PUCCH format, as in < methods 1-1 to 1-3> of modification 1 of embodiment 1, the PUCCH format may not be included in the indication by the RMSI. Also, regarding the PUCCH format, the PUCCH format may be determined in association with message 1 based on the following method other than < methods 1-1 to 1-3 >.

< method 4-1>

Terminal 200 may determine which PUCCH format (which of PUCCH format 0 and PUCCH format 1 is used) to transmit ACK/NACK for message 4 to be used based on the message 1 resource in the RACH procedure as shown in fig. 17. Note that fig. 17 shows processing for transmission of a message (ST106 to ST108 and ST110) and transmission of ACK/NACK for message 4 (ST112) in the processing shown in fig. 5.

For example, the base station 100 may configure different message 1 resources between the case where the message 2, message 3, or message 4 is slot-based transmission and the case where the message 2, message 3, or message 4 is non-slot-based transmission, and may associate different PUCCH formats for each message 1 resource. In fig. 17, in the case of transmitting message 1 using the message 1 resource (resource 0) for slot-based transmission, terminal 200 selects PUCCH format 1 (long PUCCH), and in the case of transmitting message 1 using the message 1 resource (resource 1) for non-slot-based transmission, terminal 200 selects PUCCH format 0 (short PUCCH).

With this configuration, the terminal 200 can recognize the PUCCH format without an indication by the RMSI, so that overhead for indicating the PUCCH format from the base station 100 to the terminal 200 can be reduced.

< method 4-2>

The terminal 200 may determine which PUCCH format (which of PUCCH format 0 and PUCCH format 1 is used) to transmit ACK/NACK for the message 4 to be used based on the message 1 format (may be referred to as "PRACH format" or "preamble format"). Note that fig. 18 shows processing of transmission of a message (ST106 to ST108 and ST110) and transmission of ACK/NACK for message 4 (ST112) in the processing shown in fig. 5.

NR supports multiple PRACH formats with different sequence lengths to support multiple coverage levels. In fig. 18, in the case of transmitting a message 1 using a PRACH format (short format) having a short sequence length, the terminal 200 selects a PUCCH format 0 for transmitting ACK/NACK for a message 4, and in the case of transmitting a message 1 using a PRACH format (short format) having a long sequence length, the terminal 200 selects a PUCCH format 1 for transmitting ACK/NACK for a message 4.

With this configuration, the terminal 200 can recognize the PUCCH format without an indication by the RMSI, so that overhead for indicating the PUCCH format from the base station 100 to the terminal 200 can be reduced.

(example 3)

The base station and the terminal according to embodiment 3 have a basic configuration common to the base station 100 and the terminal 200 according to embodiment 1, and thus a description will be given here when fig. 3 and 4 are combined.

The base station 100 can allocate resources for the terminal 200 to transmit the message 3 in the RACH procedure. In this regard, in embodiment 3, the association between 4 bits (16 modes) in the RMSI and the PUCCH resource set for transmitting ACK/NACK for message 4 (the association is different for different resources) is distinguished according to the resources of the message 3 resources.

As described in embodiment 1, the base station 100 indicates, to the terminal 200, a PUCCH resource set related to a PUCCH resource to be used for transmitting ACK/NACK for message 4 (i.e., a PUCCH resource before RRC connection setup is completed) using 4 bits in RMSI (ST104 in fig. 5).

As in embodiment 1, the parameters forming the PUCCH resource set include symbol position within a slot, the number of symbols within a slot, frequency position, on/off state (enable/disable) of application of frequency hopping, and code resources such as cyclic shift sequences or orthogonal codes. In addition, the PUCCH resource set includes a plurality of PUCCH resources, each PUCCH resource being defined by a combination of a plurality of parameters. For example, the number of PUCCH resources included in one PUCCH resource set may be 4 or 8. However, the number of PUCCH resources included in one PUCCH resource set is not limited to 4 or 8.

Also, the base station 100 indicates which PUCCH resource will be actually used among a plurality of PUCCH resources included in the PUCCH resource set through a PUCCH resource indicator included in a D L control signal (DCI) for the scheduling message 4 (ST110 in fig. 5). in case the number of PUCCH resources included in the PUCCH resource set is 4, for example, 2 bits of DCI may be used for the PUCCH resource indicator.

Also, the number of DCI bits for the PUCCH resource indicator is X bits and the number of PUCCH resources included in the PUCCH resource set is greater than 2^XFor example, for implicit indication, the PUCCH may be implicitly indicated using C-RNTI mod Z, IMSI mod Z, or CCE mod Z, etc., based on an identifier (C-RNTI or IMSI) of the terminal 200 or a CCE of a D L control channel (PDCCH) used for DCI transmission to the terminal 200.

Fig. 19A shows an example of association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 according to embodiment 3. As shown in fig. 19A, in embodiment 3, for each of the message 3 resources (message 3 resource 0 and message 3 resource 1 in fig. 19A) allocated to each terminal 200, association is made between 4 bits (16 patterns) in the RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4. More specifically, in embodiment 3, association between a value (4 bits in RMSI) to be indicated by higher layer signaling and a plurality of PUCCH resource sets is configured for each message 3 resource.

Fig. 19B shows an association between 2 bits (4 modes of 0 to 3) of DCI (PUCCH resource indicator) for message 3 resource 0 and a PUCCH resource (0, n, x), where x is 0 to 3) included in the PUCCH resource set (0, n, x) configured in fig. 19A, where n is 0 to 15. Further, fig. 19C shows parameters (symbol position a (0, n, x) within a slot, number of symbols B (0, n, x) within a slot), frequency position (before applying frequency hopping) C (0, n, x), frequency position (after applying frequency hopping) D (0, n, x), on-off state of application of frequency hopping (enable/disable), code resources (cyclic shift sequence E (0, n, x) and orthogonal code F (0, n, x)), and PUCCH format of PUCCH resource (0, n, x)) defined for message 3 resource 0 to be configured in fig. 19B.

Also, fig. 19D shows an association between 2 bits (4 modes of 0 to 3) of DCI (PUCCH resource indicator) and a PUCCH resource (1, n, x), where x is 0 to 3) included in the PUCCH resource set (1, n, x) configured in fig. 19A for message 3 resource 1. Further, fig. 19E shows parameters (symbol position a (1, n, x) within a slot, number B (1, n, x) of symbols within a slot, frequency position (before applying frequency hopping) C (1, n, x), frequency position (after applying frequency hopping) D (1, n, x), on-off state (enable/disable) of application of frequency hopping), code resources (cyclic shift sequence E (1, n, x) and orthogonal code F (1, n, x)) defining PUCCH resources (1, n, x) to be configured in fig. 19D, and PUCCH format of PUCCH resources (1, n, x) for message 3 resource 1.

For example, in the case where association between 4 bits (16 modes) in RMSI and a PUCCH resource set for transmitting ACK/NACK for message 4 is common regardless of message 3 resources (e.g., see fig. 6A), a base station may configure 16 PUCCH resource sets in total in the system.

In this regard, according to embodiment 3, for example, since the base station 100 can configure 16 PUCCH resource sets for each message 3 resource, N message 3 resources in the entire system can be configured (16 × N) PUCCH resource sets, more specifically, according to embodiment 3 (fig. 19A), it is made possible to increase the number of configurable PUCCH resource sets as compared with a case where a common PUCCH resource set is configured regardless of the message 3 resource.

As described above, according to embodiment 3, even in the case where only 4 bits are available in RMSI for indicating a PUCCH resource set during initial access, it is possible to flexibly configure parameters related to PUCCH resources for transmitting ACK/NACK.

Meanwhile, the message 3 resource configuration allows flexible resource allocation compared to the message 1 resource configuration. To this end, associating a PUCCH resource set for transmitting ACK/NACK for message 4 with a message 3 resource allows more flexible PUCCH resource allocation for transmitting ACK/NACK for message 4.

Further, because of the association between the message 3 resource and the PUCCH resource for transmitting ACK/NACK for the message 4, for example, the frequency position (PRB number) of the PUCCH resource for transmitting ACK/NACK for the message 4 can be determined with reference to the frequency resource of the message 3 (PRB of the message 3) as shown in fig. 20A and 20B.

For PUCCH resources used to transmit ACK/NACK for message 4, one or some parameters may be indicated to terminal 200 through PUCCH resource set, and the remaining parameters may be configured without RMSI indication, as in < methods 2-1 to 2-7> of variation 2 of embodiment 1. Also, for the PUCCH format, the PUCCH format may not be included in the indication by RMSI as in < methods 1-1 to 1-3> of modification 1 of embodiment 1, and as in < methods 4-1 and 4-2> of modification 2 of embodiment 2.

Each embodiment of the present disclosure has been described thus far.

Note that, regarding the PUCCH used for transmitting ACK/NACK for message 4, terminal 200 needs to identify which parameter set (Numerology) is to be used (subcarrier spacing) in addition to the above-described parameters. For a parameter set (subcarrier spacing) of a PUCCH for transmitting ACK/NACK for message 4, for example, the same parameter set (subcarrier spacing) as that of message 1 or message 3 may be used, or the parameter set may be determined in association with the parameter set (subcarrier spacing) of message 1 or message 3.

Further, the terminal 200 may determine a parameter set (subcarrier spacing) of a PUCCH for transmitting ACK/NACK for message 4 based on information explicitly indicated in RACH configuration or information explicitly indicated from the base station 100 to the terminal 200 through message 4.

Further, in the above-described embodiment, the case where the association between 4 bits in the RMSI and the PUCCH resource set is distinguished per message 1 resource or per message 3 resource for each PUCCH format has been described. The parameter used as a basis for distinguishing the association between the 4 bits in the RMSI and the PUCCH resource set is not limited to the PUCCH format, the message 1 resource, or the message 3 resource, and may be any parameter related to initial access (RACH procedure). The parameter serving as a basis for changing the association between the 4 bits in the RMSI and the PUCCH resource set may be, for example, a pre-configured parameter used in the initial access process, and may be a parameter related to an operation mode (operation condition) when the initial access process is performed.

Further, all or any two of embodiments 1 to 3 may be applied simultaneously. Thus, even more PUCCH resource sets may be configured.

The functional blocks used in the description of each of the embodiments described above may be implemented partially or fully by L SI such as an integrated circuit, and each process described in each embodiment may be controlled partially or fully by a combination of the same L SI or L SI L SI may be formed separately as a chip or one chip may be formed to include some or all of the functional blocks L SI may include data inputs and outputs coupled thereto depending on the differences in the degree of integration L SI herein may be referred to as IC, system L SI, super L SI or super L SI. however, the technology to implement an integrated circuit is not limited to L SI and may be implemented by using a dedicated circuit, a general purpose processor or a dedicated processor.

A base station according to the present disclosure includes a circuit that determines one set from a plurality of sets, each set including one or more candidates for resources of an uplink (U L) control channel during initial access and determines one candidate from among the one or more candidates included in the determined set, a transmitting unit that indicates the determined one set to a terminal through higher layer signaling and indicates the determined one candidate to the terminal through dynamic signaling, and a receiving unit that receives a U L control signal using resources corresponding to the determined one candidate in the determined one set, wherein an association between a value indicated through higher layer signaling and the plurality of sets is configured for each of one or more parameters related to initial access.

In a base station according to the present disclosure, the one or more parameters related to initial access include a format of a U L control channel.

In the base station according to the present disclosure, the one or more parameters related to the initial access include resources for transmission of message 1 in the initial access.

In the base station according to the present disclosure, the one or more parameters related to the initial access comprise resources for transmission of the message 3 in the initial access.

In the base station according to the present disclosure, one or some of the one or more parameters related to the resource for the U L control channel are included in the determined one set and indicated to the terminal, and the remaining one or more parameters are configured without being indicated to the terminal through the determined one set.

In the base station according to the present disclosure, the remaining one of the one or more parameters includes a format of the U L control channel, and the format of the U L control channel is determined based on a transmission mode of the message 2 or the message 3 in the initial access.

In a base station according to the present disclosure, the remaining parameters of the one or more parameters include the format of the U L control channel, and the format of the U L control channel is indicated to the terminal in the initial access by message 4.

In the base station according to the present disclosure, the remaining one of the one or more parameters includes a format of the U L control channel, and the format of the U L control channel is determined based on a transmission mode of the message 4 in the initial access.

In a base station according to the present disclosure: the remaining one of the one or more parameters includes at least one of a symbol position and a number of symbols within the slot, and the at least one of the symbol position and the number of symbols within the slot is a fixed value.

In a base station according to the present disclosure: the remaining one of the one or more parameters includes at least one intra-slot symbol position, and the at least one intra-slot symbol position is limited to one or some configurable value.

In a base station according to the present disclosure: the remaining one of the one or more parameters includes a value indicating an on-off status (enable/disable) of application of frequency hopping, and frequency hopping is always applied.

In a base station according to the present disclosure: the remaining one of the one or more parameters includes a first frequency location after applying frequency hopping, and the first frequency location is determined based on a second frequency location before applying frequency hopping.

In a base station according to the present disclosure: the remaining one of the one or more parameters includes a frequency location, and the frequency location is calculated based on a cell ID of a cell in which the terminal is located.

In the base station according to the present disclosure, the format of the U L control channel is determined based on the resources to be used for the transmission of message 1 in the initial access.

In the base station according to the present disclosure, the format of the U L control channel is determined based on the format of message 1 in the initial access.

In the base station according to the present disclosure, the subcarrier spacing of the U L control channel is determined based on the subcarrier spacing during transmission of the message 1 or the message 3 in the initial access.

In the base station according to the present disclosure, the subcarrier spacing of the U L control channel is explicitly indicated from the base station to the terminal.

A terminal according to the present disclosure includes a receiving unit that receives high layer signaling indicating any of a plurality of sets, wherein each set includes one or more candidates for resources of an uplink (U L) control channel during initial access, and receives dynamic signaling indicating any of the one or more candidates in the set indicated by the high layer signaling, and a transmitting unit that transmits the U L control signal using resources corresponding to a candidate indicated by the dynamic signaling among the one or more candidates included in the set indicated by the high layer signaling, wherein an association between a value indicated by the high layer signaling and the plurality of sets is configured for each of one or more parameters related to the initial access.

A communication method according to the present disclosure includes determining one set from a plurality of sets, wherein each set includes one or more candidates for resources for an uplink (U L) control channel during initial access, and determining one candidate from the one or more candidates included in the determined one set, indicating the determined one set to a terminal through higher layer signaling, and indicating the determined one candidate to the terminal through dynamic signaling, and receiving a U L control signal using resources corresponding to the determined one candidate in the determined one set, wherein an association between a value indicated through higher layer signaling and the plurality of sets is configured for each of one or more parameters related to the initial access.

A communication method according to the present disclosure includes receiving high layer signaling indicating any of a plurality of sets, wherein each set includes one or more candidates for resources for an uplink (U L) control channel during initial access, and receiving dynamic signaling indicating any of the one or more candidates for resources, the one or more candidates being included in the set indicated by the high layer signaling, and transmitting the U L control signal using resources corresponding to a candidate indicated by the dynamic signaling among the one or more candidates included in the set indicated by the high layer signaling, wherein an association between a value indicated by the high layer signaling and the plurality of sets is configured for each of one or more parameters related to the initial access.

INDUSTRIAL APPLICABILITY

An aspect of the present disclosure is useful in a mobile communication system.

List of reference numerals

100 base station

101. 209 control unit

102 data generating unit

103. 107, 110, 211 coding unit

104 retransmission control unit

105. 108, 111, 212 modulation unit

106 high-level control signal generating unit

109D L control signal generation unit

112. 213 Signal dispatching Unit

113. 214 IFFT processor

114. 215 sending unit

115. 201 antenna

116. 202 receiving unit

117. 203 FFT processor

118. 204 extraction unit

119 demodulation unit/decoding unit

120 determination unit

200 terminal

205D L control signal demodulation unit

206 high-level control signal demodulation unit

207D L data signal demodulation unit

208 error detection unit

211 ACK/NACK generation unit