WO2022071229A1 - Terminal device, base station device, and communication method - Google Patents

Abstract

During a random access procedure, the present invention selects a first random access preamble or a second random access preamble on the basis of reception quality, transmits PUSCH by using a first modulation scheme and transmits PUCCH by using the first modulation scheme when the first random access preamble is selected, and transmits PUSCH by using a second modulation scheme and transmits PUCCH by using the second modulation scheme when the second random access preamble is selected.

Description

Terminal equipment, base station equipment and communication method

The present invention relates to a terminal device, a base station device, and a communication method.
The present application claims priority with respect to Japanese Patent Application No. 2020-162798 filed in Japan on September 29, 2020, the contents of which are incorporated herein by reference.

A third-generation partnership project (3GPP: 3rdPerge It is being examined in Project). In LTE, the base station device is also referred to as an eNodeB (evolved NodeB), and the terminal device is also referred to as a UE (User Equipment). LTE is a cellular communication system in which a plurality of areas covered by a base station device are arranged in a cell shape. A single base station appliance may manage multiple serving cells.

In 3GPP, next-generation standards (NR: New Radio) are being studied and standardized as 5G communication methods. In the framework of a single technology, NR is assumed to meet three scenarios: eMBB (enhanced Mobile Broadband), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication). There is.

In addition, a method for improving coverage is being studied (Non-Patent Document 1). The eMBB service and VoIP service are considered as target services. PUSCH and PUCCH uplink channels are considered as channels that require improvement in coverage.

Coverage improvement is required even at the time of initial connection. In the initial connection procedure, it is required to efficiently improve the coverage for the uplink channel. One aspect of the present invention provides a terminal device for efficient communication, a base station device, a communication method used for the terminal device, and a communication method used for the base station device.

(1) In order to achieve the above object, one aspect of the present invention has taken the following measures. That is, the first aspect of the present invention is a terminal device including a processor and a memory for storing a computer program code, the first random access preamble and the second random access preamble based on the reception quality in the random access procedure. To select one of the random access preambles of, to send the selected first random access preamble or the selected second random access preamble, to receive a random access response, using PUSCH. Includes sending an RRC connection request message containing an ID used to identify the terminal device, receiving a collision resolution message using the PDSCH, and sending HARQ-ACK to the PDSCH using the PUCCH. When the operation is performed and the first random access preamble is selected, the PUSCH is transmitted using the first modulation method, the PUCCH is transmitted using the first modulation method, and the second. When the random access preamble is selected, the PUSCH is transmitted using the second modulation method, and the PUCCH is transmitted using the second modulation method.

(2) Further, the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.

(3) A second aspect of the present invention is a base station apparatus including a processor and a memory for storing a computer program code, wherein in a random access procedure, a first random access preamble or a second random access. Detecting a transmission from the terminal device 1 in the preamble, sending a random access response, using the PUSCH to receive an RRC connection request message containing an ID used to identify the terminal device, using the PDSCH. When an operation including sending a collision resolution message and receiving HARQ-ACK for the PDSCH using the PUCCH is performed and the first random access preamble is detected, the first modulation method is used. When the PUSCH is received, the PUCCH is received using the first modulation method, and the second random access preamble is detected, the PUSCH is received using the second modulation method, and the second It is executed to receive the PUCCH by using the modulation method of.

(4) Further, the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.

(5) A third aspect of the present invention is a communication method used for a terminal device, in which one of a first random access preamble and a second random access preamble is selected based on reception quality in a random access procedure. Identification of the terminal device using a PUSCH, a step of selection, a step of transmitting the selected first random access preamble or the selected second random access preamble, a step of receiving a random access response, and a PUSCH. A step of transmitting an RRC connection request message including an ID used for the PDSCH, a step of receiving a collision resolution message using the PDSCH, and a step of transmitting HARQ-ACK for the PDSCH using the PUCCH. When the first random access preamble was selected, the PUSCH was transmitted using the first modulation method, the PUCCH was transmitted using the first modulation method, and the second random access preamble was selected. In this case, the PUSCH is transmitted using the second modulation method, and the PUCCH is transmitted using the second modulation method.

(6) Further, the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.

(7) A fourth aspect of the present invention is a communication method used for a base station device, in which transmission from a terminal device 1 is performed in a first random access preamble or a second random access preamble in a random access procedure. A step of detecting, a step of transmitting a random access response, a step of receiving an RRC connection request message including an ID used for identifying the terminal device using PUSCH, and a step of transmitting a collision resolution message using PDSCH. When the first random access preamble is detected, the first random access preamble includes the step of receiving HARQ-ACK for the PDSCH using the PUCCH, and the PUSCH is received using the first modulation method. When the PUCCH is received using one modulation method and the second random access preamble is detected, the PUSCH is received using the second modulation method, and the PUCCH is received using the second modulation method. To receive.

(8) Further, the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.

According to one aspect of the present invention, the terminal device can efficiently communicate. In addition, the base station device can efficiently communicate.

It is a conceptual diagram of the wireless communication system which concerns on one aspect of this Embodiment. This is an example showing the relationship between the N ^slot _symb , the subcarrier interval setting μ, the slot setting, and the CP setting according to one aspect of the present embodiment. It is an example which shows the structure of the radio frame, the subframe, and the slot which concerns on one aspect of this Embodiment. It is a schematic diagram which shows an example of the resource grid in the subframe which concerns on one aspect of this Embodiment. It is a figure which shows an example of the initial connection procedure which concerns on one aspect of this Embodiment. It is a schematic block diagram which shows the structure of the terminal apparatus 1 which concerns on one aspect of this Embodiment. It is a schematic block diagram which shows the structure of the base station apparatus 3 which concerns on one aspect of this Embodiment.

Hereinafter, embodiments of the present invention will be described.

"A and / or B" may be a term including "A", "B", or "A and B".

When a parameter or information indicates one or more values, the parameter or information may include at least a parameter or information indicating the one or more values. The upper layer parameter may be a single upper layer parameter. The upper layer parameter may be an information element (IE: Information Element) including a plurality of parameters.

FIG. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. In FIG. 1, the wireless communication system includes terminal devices 1A to 1C and base station devices 3A to 3B. Hereinafter, the terminal devices 1A to 1C are also referred to as a terminal device 1 (UE). Hereinafter, the base station devices 3A to 3B are also referred to as base station devices 3 (gNB).

The base station device 3 may be configured to include one or both of an MCG (Master Cell Group) and an SCG (Secondary Cell Group). MCG is a group of serving cells composed of at least PCell (Primary Cell). An SCG is a group of serving cells configured to include at least a PSCell (Primary Secondary Cell). The PCell may be a serving cell given based on the initial connection. The MCG may be configured to include one or more SCells (Secondary Cell). The SCG may be configured to include one or more SCells. A serving cell identifier is a short identifier for identifying a serving cell. The serving cell identifier may be given by a higher layer parameter.

The frame configuration will be described below.

At least OFDM (Orthogonal Frequency Division Multiplex) is used in the wireless communication system according to one aspect of the present embodiment. The OFDM symbol is a unit of the OFDM time domain. The OFDM symbol comprises at least one or more subcarriers. The OFDM symbol may be converted into a time-continuous signal in the baseband signal generation.

The subcarrier spacing (SCS: SubCarrier Spacing) may be given by the subcarrier spacing Δf = 2 ^μ · 15 kHz. For example, the subcarrier spacing configuration μ may be set to any of 0, 1, 2, 3, 4, and / or 5. For a certain BWP (BandWidth Part), the setting μ of the subcarrier spacing may be given by the upper layer parameter.

In the wireless communication system according to one aspect of the present embodiment, a time unit (time unit) T _c is used to express the length of the time domain. The time unit T _c may be given by T _c = 1 / (Δf _max · N _f ). Δf _max may be the maximum value of the subcarrier spacing supported in the wireless communication system according to one embodiment of the present embodiment. Δf _max may be Δf _max = 480 kHz. N _f may be N _f = 4096. The constant κ is κ = Δf _max · N _f / (Δf _ref N _{f, ref} ) = 64. Δf _ref may be 15 kHz. N _{f and ref} may be 2048.

The constant κ may be a value indicating the relationship between the reference subcarrier interval and T _c . The constant κ may be used for the length of the subframe. The number of slots contained in the subframe may be given, at least based on the constant κ. Δf _ref is a reference subcarrier interval, and N _{f and ref} are values corresponding to the reference subcarrier interval.

The transmission on the downlink and / or the transmission on the uplink is composed of 10 ms frames. The frame is composed of 10 subframes. The length of the subframe is 1 ms. The frame length may be given regardless of the subcarrier spacing Δf. That is, the frame setting may be given regardless of μ. The length of the subframe may be given regardless of the subcarrier spacing Δf. That is, the subframe setting may be given regardless of μ.

The number and index of slots contained in a subframe may be given for a given subcarrier spacing setting μ. For example, the first slot number n ^μ _s may be given in ascending order in the range of 0 to N ^{subframe, μ} _slot -1 in the subframe. The number and index of slots contained in the frame may be given for the setting μ of the subcarrier spacing. For example, the second slot numbers n ^μ _{s, f} may be given in ascending order in the range of 0 to N ^{frame, μ} _slot -1 in the frame. One slot may contain consecutive N ^slot _symb OFDM symbols. The N ^slot _symb may be given at least based on some or all of the slot configuration and / or CP (Cyclo Prefix) settings. The slot setting may be given by at least the upper layer parameter tdd-UL-DL-ConfictionCommon. CP settings may be given at least based on higher layer parameters. CP settings may be given at least based on dedicated RRC signaling. The first slot number and the second slot number are also referred to as slot numbers (slot indexes).

FIG. 2 is an example showing the relationship between the N ^slot _symb , the subcarrier interval setting μ, the slot setting, and the CP setting according to one aspect of the present embodiment. In FIG. 2A, when the slot setting is 0, the subcarrier interval setting μ is 2, and the CP setting is normal CP (normal cyclic prefix), N ^slot _symb = 14, N ^{frame, μ} _slot = 40, N ^{subframe, μ} _slot = 4. Further, in FIG. 2B, when the slot setting is 0, the subcarrier interval setting μ is 2, and the CP setting is extended CP (extended cyclic prefix), N ^slot _symb = 12, N ^{frame, μ} _slot = 40, N ^{subframe, μ} _slot = 4. The N ^slot _symb at slot setting 0 may correspond to twice the N ^slot _symb at slot setting 1.

FIG. 3 is an example showing the configuration of a radio frame, a subframe, and a slot according to one embodiment of the present embodiment. In the example shown in FIG. 3, the slot length is 0.5 ms, the subframe length is 1 ms, and the radio frame length is 10 ms. A slot may be a unit of resource allocation in the time domain. For example, a slot may be a unit to which one transport block is mapped. For example, the transport block may be mapped to one slot. Here, the transport block is transmitted within a predetermined interval (for example, transmission time interval (TTI: Transition Time Interval)) defined by an upper layer (for example, MAC: Media Access Control, RRC: Radio Resource Control). It may be a unit of data.

For example, the slot length may be given by the number of OFDM symbols. For example, the number of OFDM symbols may be 7 or 14. The slot length may be given at least based on the length of the OFDM symbol. The length of the OFDM symbol may vary, at least based on the subcarrier spacing. Further, the length of the OFDM symbol may be given at least based on the number of points of the Fast Fourier Transform (FFT) used to generate the OFDM symbol. Further, the length of the OFDM symbol may include the length of the cyclic prefix (CP) added to the OFDM symbol. Here, the OFDM symbol may be referred to as a symbol. Further, when a communication method other than OFDM is used in the communication between the terminal device 1 and the base station device 3 (for example, when SC-FDMA or DFT-s-OFDM is used), the generated SC -FDMA symbols and / or DFT-s-OFDM symbols are also referred to as OFDM symbols. Further, unless otherwise specified, OFDM includes SC-FDMA or DFT-s-OFDM.

For example, the slot length may be 0.125 ms, 0.25 ms, 0.5 ms, 1 ms. For example, if the subcarrier spacing is 15 kHz, the slot length may be 1 ms. For example, if the subcarrier spacing is 30 kHz, the slot length may be 0.5 ms. For example, if the subcarrier spacing is 120 kHz, the slot length may be 0.125 ms. For example, if the subcarrier spacing is 15 kHz, the slot length may be 1 ms. For example, if the slot length is 0.125 ms, one subframe may consist of eight slots. For example, if the slot length is 0.25 ms, one subframe may consist of four slots. For example, if the slot length is 0.5 ms, one subframe may consist of two slots. For example, if the slot length is 1 ms, one subframe may be composed of one slot.

Here, OFDM includes a multi-carrier communication method to which waveform shaping (Pulse Shape), PAPR reduction, out-of-band radiation reduction, or filtering, and / or phase processing (for example, phase rotation, etc.) are applied. The multi-carrier communication method may be a communication method in which a plurality of subcarriers generate / transmit a multiplexed signal.

The wireless frame may be given by the number of subframes. The number of subframes for the radio frame may be, for example, 10. The radio frame may be given by the number of slots.

The physical resources will be explained below.

An antenna port is defined by the fact that the channel through which a symbol is transmitted in one antenna port can be estimated from the channel through which another symbol is transmitted in the same antenna port. If the large scale property of the channel on which the symbol is transmitted in one antenna port can be estimated from the channel in which the symbol is transmitted in the other antenna port, the two antenna ports are QCL (Quasi Co-Located). ). Large-scale characteristics may include at least long-interval characteristics of the channel. Large-scale characteristics include delay spread, Doppler spread, Doppler shift, average gain, average delay, and beam parameters (spray). It may include at least some or all. The fact that the first antenna port and the second antenna port are QCL with respect to the beam parameters means that the receiving beam assumed by the receiving side with respect to the first antenna port and the receiving beam assumed by the receiving side with respect to the second antenna port. May be the same. The fact that the first antenna port and the second antenna port are QCL with respect to the beam parameters means that the transmission beam assumed by the receiving side with respect to the first antenna port and the transmitting beam assumed by the receiving side with respect to the second antenna port. May be the same. The terminal device 1 assumes that the two antenna ports are QCLs if the large scale characteristics of the channel through which the symbol is transmitted in one antenna port can be estimated from the channel in which the symbol is transmitted in the other antenna port. May be done. The fact that the two antenna ports are QCLs may mean that the two antenna ports are QCLs.

A resource grid of N ^μ _{RB, x} N ^RB _sc subcarriers and N ^(μ) _symb N ^{subframe, μ} _symb OFDM symbols is given for each of the subcarrier spacing settings and carrier sets. N ^μRB _{, x} may indicate the number of resource blocks given for setting the subcarrier spacing μ for carrier x. N ^μRB _{, x} may be the maximum number of resource blocks given for setting the subcarrier spacing μ for carrier x. The carrier x indicates either a downlink carrier or an uplink carrier. That is, x is "DL" or "UL". N ^μ _RB is a name that includes N ^μ _{RB, DL} , and / or N ^μ _{RB, UL} . ^NRB _sc may indicate the number of subcarriers contained in one resource block. At least one resource grid may be given for each antenna port p and / or for each subcarrier spacing setting μ and / or for each transmission direction setting. The transmission direction includes at least a downlink (DL: DownLink) and an uplink (UL: UpLink). Hereinafter, a set of parameters including at least a part or all of an antenna port p, a subcarrier interval setting μ, and a transmission direction setting is also referred to as a first radio parameter set. That is, one resource grid may be given for each first set of radio parameters.

In the downlink, the carrier included in the serving cell is referred to as a downlink carrier (or downlink component carrier). In the uplink, the carrier included in the serving cell is referred to as an uplink carrier (uplink component carrier). The downlink component carrier and the uplink component carrier are collectively referred to as a component carrier (or carrier).

Each element in the resource grid given for each first set of radio parameters is referred to as a resource element. The resource element is specified by the frequency domain index k _sc and the time domain index l _sym . For a first set of radio parameters, resource elements are identified by an index k _sc in the frequency domain and an index l _sym in the time domain. The resource element specified by the frequency domain index k _sc and the time domain index l _sim is also referred to as a resource element (k _sc , l _sym ). The frequency domain index k _sc indicates any value from 0 to N ^μ _RB N ^RB _sc -1. N ^μ _RB may be the number of resource blocks given for setting the subcarrier interval μ. N ^RB _sc is the number of subcarriers contained in the resource block, and N ^RB _sc = 12. The frequency domain index k _sc may correspond to the subcarrier index k _sc . The time domain index l _{sim may correspond to the OFDM symbol index l sym .}

FIG. 4 is a schematic diagram showing an example of a resource grid in a subframe according to an embodiment of the present embodiment. In the resource grid of FIG. 4, the horizontal axis is the index l _sym in the time domain, and the vertical axis is the index k _sc in the frequency domain. In one subframe, the frequency domain of the resource grid contains N ^μ _RB N ^RB _sc subcarriers. In one subframe, the time domain of the resource grid may contain 14.2 ^μ OFDM symbols. One resource block is composed of ^NRB _sc subcarriers. The time domain of the resource block may correspond to one OFDM symbol. The time domain of the resource block may correspond to 14 OFDM symbols. The time domain of the resource block may correspond to one or more slots. The time domain of the resource block may correspond to one subframe.

The terminal device 1 may be instructed to perform transmission / reception using only a subset of the resource grid. A subset of the resource grid is also referred to as a BWP (BWP: BandWidthPart), where the BWP may be given at least based on the upper layer parameters and / or part or all of the DCI. BWP is also referred to as a band part (BP: Bandwidth Part). That is, the terminal device 1 may not be instructed to perform transmission / reception using the entire set of resource grids. That is, the terminal device 1 may be instructed to perform transmission / reception using a part of the frequency resources in the resource grid. One BWP may be composed of a plurality of resource blocks in the frequency domain. One BWP may be composed of a plurality of continuous resource blocks in the frequency domain. The BWP set for the downlink carrier is also referred to as a downlink BWP. The BWP set for the uplink carrier is also referred to as an uplink BWP.

One or more downlink BWPs may be set for the terminal device 1. The terminal device 1 may attempt to receive a physical channel (eg, PDCCH, PDSCH, SS / PBCH, etc.) in one of the downlink BWPs of one or more downlink BWPs. The one downlink BWP is also referred to as an activated downlink BWP.

One or more uplink BWPs may be set for the terminal device 1. The terminal device 1 may attempt to transmit a physical channel (eg, PUCCH, PUSCH, PRACH, etc.) in one of the uplink BWPs of one or more uplinks BWP. The one uplink BWP is also referred to as an activated uplink BWP.

A set of downlink BWP may be set for the serving cell. A set of downlink BWPs may include one or more downlink BWPs. A set of uplink BWPs may be set for the serving cell. A set of uplink BWPs may include one or more uplink BWPs.

The upper layer parameter is a parameter included in the upper layer signal. The signal of the upper layer may be RRC (Radio Resource Control) signaling or MAC CE (Medium Access Control Control Element). Here, the signal of the upper layer may be a signal of the RRC layer or a signal of the MAC layer.

The signal of the upper layer may be common RRC signaling (comon RRC signaling). The common RRC signaling may include at least some or all of the following features C1 to C3.
Feature C1) Map to BCCH logical channel or CCCH logical channel Feature C2) Map to feature C3) PBCH containing at least the radioRelocationConfigCommon information element

The radioRelocationConfigCommon information element may include information indicating a setting commonly used in a serving cell. The settings commonly used in the serving cell may include at least the PRACH setting. The PRACH setting may indicate at least one or more random access preamble indexes. The PRACH setting may indicate at least the PRACH time / frequency resource.

The radioResourceConfigCommon information element (RRC signaling) contains information indicating the configuration of Random access. The configuration of Random access includes the configuration of Random access used for the terminal device 1 that needs to improve coverage. Information indicating one or a plurality of random access preamble indexes used for the terminal device 1 requiring coverage improvement is included in the information indicating the configuration of the Random access. Information indicating the threshold value of reception quality (threshold value of RSRP) used for determining whether coverage improvement is necessary is included in the information indicating the configuration of Random access. It is determined that the terminal device 1 having a reception quality smaller than the threshold value uses a random access preamble of one or a plurality of random access preambles corresponding to one or a plurality of random access preamble indexes for improving coverage.

Information indicating the resource block of PRACH used for the terminal device 1 requiring coverage improvement may be included in the information indicating the configuration of Random access. Information indicating the cycle and offset (Random access occupation) of the PRACH used in the terminal device 1 requiring coverage improvement may be included in the information indicating the configuration of the Random access.

The radioRelocationConfigCommon information element contains information indicating the configuration of the PUCCH for improving coverage. The PUCCH configuration for improving coverage includes the frequency resources and time resources of the PUCCH. PUCCH is used at least for transmitting and receiving HARQ-ACK. The PUCCH is used to send and receive HARQ-ACK to the PDSCH of the message 4.

The upper layer signal may be dedicated RRC signaling. Dedicated RRC signaling may include at least some or all of the following features D1 to D2.
Feature D1) Features mapped to DCCH logical channels D2) Includes at least a radioResourseConnect Defined information element

The radioResourceConfigProcessed information element may include at least information indicating a setting peculiar to the terminal device 1. The radioResourceConfigProcessated information element may include at least information indicating the setting of the BWP. The BWP settings may at least indicate the frequency resources of the BWP.

For example, the MIB, the first system information, and the second system information may be included in the common RRC signaling. Further, the upper layer messages that are mapped to the DCCH logical channel and include at least the radioRelocationConfigCommon may be included in the common RRC signaling. Further, the message of the upper layer which is mapped to the DCCH logical channel and does not include the radioRelocationConfigCommon information element may be included in the dedicated RRC signaling. Further, the message of the upper layer that is mapped to the DCCH logical channel and contains at least the radioRelocationControlProcessed information element may be included in the dedicated RRC signaling.

The first system information may at least indicate the time index of the SS (Synchronization Signal) block. The SS block (SS block) is also referred to as an SS / PBCH block (SS / PBCH block). The SS / PBCH block is also referred to as SS / PBCH. The first system information may include at least information related to the PRACH resource. The first system information may include information indicating the configuration of Random access. The first system information may include information indicating the configuration of the PUCCH. The first system information may include at least information related to the initial connection settings. The second system information may be system information other than the first system information.

The radioResourseControlProcessed information element may include at least information related to the PRACH resource. The radioResourseControlProcessed information element may contain at least information related to the initial connection settings.

Hereinafter, physical channels and physical signals according to various aspects of the present embodiment will be described.

An uplink physical channel may correspond to a set of resource elements that carry information that occurs in the upper layers. The uplink physical channel is a physical channel used in the uplink carrier. In the wireless communication system according to one embodiment of the present embodiment, at least a part or all of the following uplink physical channels are used.
・ PUCCH (Physical Uplink Control Channel)
・ PUSCH (Physical Uplink Shared Channel)
・ PRACH (Physical Random Access Channel)

PUCCH may be used to transmit uplink control information (UCI: Uplink Control Information). Uplink control information includes channel state information (CSI: Channel State Information), scheduling request (SR: Scheduling Request), transport block (TB: Transport block, MAC PDU: Medium Access Control, Digital Digital -Includes a part or all of HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement) corresponding to Shared Channel, PDSCH: Physical Downlink Shared Channel. The uplink control information may include information not described above.

The HARQ-ACK may include at least the HARQ-ACK bit (HARQ-ACK information) corresponding to at least one transport block. The HARQ-ACK bit may indicate ACK (acknowledgedgement) or NACK (negate-acknowledgedgement) corresponding to one or more transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook containing one or more HARQ-ACK bits. The fact that the HARQ-ACK bit corresponds to one or more transport blocks may mean that the HARQ-ACK bit corresponds to a PDSCH containing the one or more transport blocks. The HARQ-ACK bit may indicate ACK or NACK corresponding to one CBG (Code Block Group) included in the transport block.

The scheduling request (SR: Scheduling Request) may be at least used to request the resources of the PUSCH for the initial transmission. The scheduling request bit may be used to indicate either a positive SR (positive SR) or a negative SR (negative SR). The fact that the scheduling request bit indicates a positive SR is also referred to as "a positive SR is transmitted". A positive SR may indicate that the terminal device 1 requires a PUSCH resource for initial transmission. A positive SR may indicate that the scheduling request is Triggered by the upper layer. The positive SR may be transmitted when the upper layer instructs to transmit the scheduling request. The fact that the scheduling request bit indicates a negative SR is also referred to as "a negative SR is transmitted". A negative SR may indicate that the terminal device 1 does not require PUSCH resources for initial transmission. A negative SR may indicate that the scheduling request is not triggered by the higher layer. Negative SRs may be sent if the higher layer does not instruct them to send the scheduling request.

The channel state information may include at least a part or all of a channel quality index (CQI: Channel Quality Indicator), a precoder matrix index (PMI: Precoder Matrix Indicator), and a rank index (RI: Rank Indicator). CQI is an index related to the quality of the channel (for example, propagation intensity), and PMI is an index indicating the precoder. RI is an index that indicates the transmission rank (or the number of transmission layers).

The PUCCH may support one or more PUCCH formats (eg, PUCCH format 0 to PUCCH format 4, PUCCH format 5). The PUCCH format may be mapped to the PUCCH and transmitted. The PUCCH format may be transmitted in PUCCH. The transmission of the PUCCH format may mean that the PUCCH is transmitted.

PUSCH is at least used to transmit a transport block (TB, MAC PDU, UL-SCH, PUSCH). The PUSCH may be used to transmit at least some or all of the transport block, HARQ-ACK, channel state information, and scheduling requests. PUSCH is at least used to send the random access message 3. PUSCH may be used to transmit information not described above.

PRACH is at least used to send a random access preamble (random access message 1). The PRACH is part or all of the resource requirements for the initial connection establishment procedure, the handover procedure, the connection re-station procedure, the synchronization (timing adjustment) for the transmission of the PUSCH, and the PUSCH. May be at least used to indicate. The random access preamble may be used to notify the base station device 3 of an index (random access preamble index) given by the upper layer of the terminal device 1.

In FIG. 1, in uplink wireless communication, the following uplink physical signals are used. The uplink physical signal does not have to be used to transmit the information output from the upper layer, but it is used by the physical layer.
-UL DMRS (UpLink Demodulation Reference Signal)
・ SRS (Sounding Reference Signal)
-UL PTRS (UpLink Phase Tracking Reference Signal)

UL DMRS is associated with PUSCH and / or PUCCH transmission. UL DMRS is multiplexed with PUSCH or PUCCH. The base station apparatus 3 may use UL DMRS to correct the propagation path of PUSCH or PUCCH. Hereinafter, transmitting both the PUSCH and the UL DMRS related to the PUSCH is referred to simply as transmitting the PUSCH. Hereinafter, transmitting PUCCH and UL DMRS related to the PUCCH together is referred to simply as transmitting PUCCH. UL DMRS related to PUSCH is also referred to as UL DMRS for PUSCH. UL DMRS related to PUCCH is also referred to as UL DMRS for PUCCH.

SRS does not have to be related to PUSCH or PUCCH transmission. The base station apparatus 3 may use SRS for measuring the channel state. The SRS may be transmitted at the end of the subframe in the uplink slot, or at a predetermined number of OFDM symbols from the end.

UL PTRS may be at least a reference signal used for phase tracking. UL PTRS may be associated with a UL DMRS group that includes at least the antenna ports used for one or more UL DMRS. The association between the UL PTRS and the UL DMRS group may be that the antenna port of the UL PTRS and a part or all of the antenna ports included in the UL DMRS group are at least QCL. The UL DMRS group may be identified at least based on the antenna port of the smallest index in the UL DMRS included in the UL DMRS group. UL PTRS may be mapped to the antenna port with the smallest index in one or more antenna ports to which one codeword is mapped. UL PTRS may be mapped to the first layer if one codeword is at least mapped to the first layer and the second layer. UL PTRS does not have to be mapped to the second layer. The index of the antenna port to which UL PTRS is mapped may be given at least based on the downlink control information.

Note that uplink physical signals not described above may be used.

In FIG. 1, the following downlink physical channels are used in the downlink wireless communication from the base station device 3 to the terminal device 1. The downlink physical channel is used by the physical layer to transmit the information output from the upper layer.
・ PBCH (Physical Broadcast Channel)
-PDCCH (Physical Downlink Control Channel)
・ PDSCH (Physical Downlink Shared Channel)

PBCH is at least used to transmit a master information block (MIB: Master Information Block, BCH, Broadcast Channel). The PBCH may be transmitted based on a predetermined transmission interval. PBCH may be transmitted at intervals of 80 ms. PBCH may be transmitted at intervals of 160 ms. The content of the information contained in the PBCH may be updated every 80 ms. Some or all of the information contained in the PBCH may be updated every 160 ms. The PBCH may be composed of 288 subcarriers. The PBCH may be configured to include 2, 3, or 4 OFDM symbols. The MIB may include information related to the identifier (index) of the synchronization signal. The MIB may contain information indicating at least a portion of the slot number, subframe number, and / or radio frame number to which the PBCH is transmitted.

PDCCH is at least used for transmission of downlink control information (DCI: Downlink Control Information). The PDCCH may be transmitted including at least the downlink control information. The PDCCH may include downlink control information. The downlink control information is also referred to as DCI format. The downlink control information may include at least one of a downlink grant (DL grant) and an uplink grant (UL grant). The DCI format used for PDSCH scheduling is also referred to as the downlink DCI format. The DCI format used for PUSCH scheduling is also referred to as the uplink DCI format. The downlink grant is also referred to as a downlink assignment (DL assignment) or a downlink allocation (DL allocation). The uplink DCI format includes at least one or both of DCI format 0_0 and DCI format 0_1.

DCI format 0_0 is configured to include at least a part or all of 1A to 1F.
1A) DCI format specific field (Identifier for DCI forms field)
1B) Frequency domain resource allocation field (Frequency domain resource field)
1C) Time domain resource allocation field (Time domain resource allocation field)
1D) Frequency hopping flag field
1E) MCS field (MCS field: Modulation and Coding Scene field)
1F) CSI request field (CSI request field)

The DCI format specific field may be at least used to indicate whether the DCI format including the DCI format specific field corresponds to one or a plurality of DCI formats. The one or more DCI formats may be given at least on the basis of DCI format 1_1, DCI format 1-11, DCI format 0_0, and / or part or all of DCI format 0_1.

The frequency domain resource allocation field may be at least used to indicate the allocation of frequency resources for the PUSCH scheduled by the DCI format including the frequency domain resource allocation field. The frequency domain resource allocation field is also referred to as an FDRA (Frequency Domain Resource Allocation) field.

The time domain resource allocation field may be at least used to indicate the allocation of time resources for the PUSCH scheduled by the DCI format containing the time domain resource allocation field.

The frequency hopping flag field may be at least used to indicate whether frequency hopping is applied to the PUSCH scheduled by the DCI format including the frequency hopping flag field.

The MCS field may be at least used to indicate a modulation scheme for the PUSCH scheduled by the DCI format including the MCS field and / or part or all of the target code rate. The target code rate may be the target code rate for the transport block of the PUSCH. The size of the transport block (TBS: Transport Block Size) may be given at least based on the target code rate.

The CSI request field is at least used to direct CSI reporting. The size of the CSI request field may be a predetermined value. The size of the CSI request field may be 0, 1, 2 or 3.

DCI format 0_1 is configured to include at least part or all of 2A to 2H.
2A) DCI format specific field 2B) Frequency domain resource allocation field 2C) Time domain resource allocation field 2D) Frequency hopping flag field 2E) MCS field 2F) CSI request field (CSI request field)
2G) BWP field (BWP field)
2H) UL DAI field (downlink assignment index)

The UL DAI field is at least used to indicate the transmission status of the PDSCH. When a dynamic HARQ-ACK codebook is used, the size of the UL DAI field may be 2 bits. The UL DAI field indicates the size of the HARQ-ACK codebook transmitted by PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook transmitted by PUSCH. The UL DAI field indicates the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH. The UL DAI field indicates the number of PDSCHs and SPS releases in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH.

The UL DAI field may indicate a value to which a modulo operation is applied. An example in which the UL DAI field has 2 bits will be described. When the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted by the PUSCH is 0, "00" is indicated as the UL DAI field. When the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted by the PUSCH is 1, "01" is indicated as the UL DAI field. When the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted by the PUSCH is 2, "10" is indicated as the UL DAI field. When the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted by the PUSCH is 3, "11" is indicated as the UL DAI field. When the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted by the PUSCH is 4, "00" is indicated as the UL DAI field. When the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted by the PUSCH is 5, "01" is indicated as the UL DAI field. When the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted by the PUSCH is 6, "10" is indicated as the UL DAI field. When the number of PDSCHs including the corresponding HARQ-ACK in the HARQ-ACK codebook transmitted by the PUSCH is 7, "11" is indicated as the UL DAI field. In this example, in the HARQ-ACK codebook transmitted by the PUSCH, a modulo operation using the numerical value '4' is performed on the number of PDSCHs including the corresponding HARQ-ACK.

The terminal device 1 interprets the UL DAI field in consideration of the total number of PDSCHs received. For example, the terminal device 1 has received four PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH, which is indicated by the UL DAI field, is four. For example, the terminal device 1 has received three PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH, which is indicated by the UL DAI field, is four, and the number of PDSCHs is one. Judge that the reception was missed.

The BWP field may be used to indicate the uplink BWP to which the PUSCH scheduled by DCI format 0_1 is mapped.

The CSI request field is at least used to direct CSI reporting. The size of the CSI request field may be given at least based on the upper layer parameter ReportTriggerSize.

The downlink DCI format includes at least one or both of DCI format 1_0 and DCI format 1_1.

DCI format 1_0 is configured to include at least part or all of 3A to 3H.
3A) DCI format specific field (Identifier for DCI forms field)
3B) Frequency domain resource allocation field (Frequency domain resource field)
3C) Time domain resource allocation field (Time domain resource allocation field)
3D) Frequency hopping flag field
3E) MCS field (MCS field: Modulation and Coding Scene field)
3F) First CSI request field (First CSI request field)
3G) PDSCH-to-HARQ feedback timing indicator field (PDSCH-to-HARQ feedback timing indicator field)
3H) PUCCH resource indicator field

The timing instruction field from PDSCH to HARQ feedback may be a field indicating timing K1. When the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the PUCCH containing at least the HARQ-ACK corresponding to the transport block contained in the PDSCH or the slot containing the PUSCH is n + K1. May be good. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, then the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH containing at least the HARQ-ACK corresponding to the transport block contained in the PDSCH The index of the included slot may be n + K1.

Hereinafter, the PDSCH-to-HARQ feedback timing indicator field (PDSCH-to-HARQ_feedback timing indicator field) may be referred to as a HARQ instruction field.

The PUCCH resource instruction field may be a field indicating an index of one or more PUCCH resources included in the PUCCH resource set.

The DCI format 1_1 is configured to include at least a part or all of 4A to 4J.
4A) DCI format specific field (Identifier for DCI forms field)
4B) Frequency domain resource allocation field (Frequency domain resource field)
4C) Time domain resource allocation field (Time domain resource allocation field)
4D) Frequency hopping flag field
4E) MCS field (MCS field: Modulation and Coding Scene field)
4F) First CSI request field (First CSI request field)
4G) PDSCH-to-HARQ feedback timing indicator field (PDSCH-to-HARQ feedback timing indicator field)
4H) PUCCH resource indicator field
4J) BWP field (BWP field)

The BWP field may be used to indicate the downlink BWP to which the PDSCH scheduled by DCI format 1-11 is mapped.

The DCI format 2_0 may be configured to include at least one or a plurality of slot format indicators (SFI: Slot Format Indicator).

The downlink control information may include a slot format index (SFI: Slot Format Indicator). A pattern indicating whether each subframe (slot) in a plurality of subframes (slots) is an uplink subframe (slot), a downlink subframe (slot), or a flexible subframe (slot) is It may be transmitted and received using the downlink control information. The terminal device 1 may determine that the received subframe (slot) not indicated by the SFI is a flexible subframe (slot). When the transmission of PUSCH is scheduled by UL grant to the flexible subframe (slot), the terminal device 1 processes the flexible subframe (slot) as an uplink subframe (slot). When the transmission of PUSCH is not scheduled by UL grant to the flexible subframe (slot), the terminal device 1 monitors the PDCCH candidate in the flexible subframe (slot) and performs a process of detecting DL assert. .. When the reception of the PDSCH is scheduled by the DL assert in the flexible subframe (slot), the terminal device 1 processes the flexible subframe (slot) as a downlink subframe (slot).

For example, downlink control information including a downlink grant or an uplink grant is transmitted / received by PDCCH including C-RNTI (Cell-Radio Network Temporary Identifier).

In various embodiments of the present embodiment, the number of resource blocks indicates the number of resource blocks in the frequency domain, unless otherwise specified.

The downlink grant is at least used for scheduling one PDSCH in one serving cell. The downlink grant is at least used for scheduling PDSCH in the same slot in which the downlink grant was transmitted. The downlink grant may be used for scheduling PDSCH in a slot different from the slot in which the downlink grant was transmitted. Uplink grants are at least used for scheduling one PUSCH in one serving cell.

The downlink DCI format may include a field (C-DAI: Counter Downlink Assignment Index field) indicating the cumulative number of transmitted PDCCHs. C-DAI may indicate the cumulative number of PDSCHs transmitted. For example, when the PDSCH transmitted is included and the cumulative number of PDSCHs transmitted so far is 1, "1" is indicated as the value of C-DAI. For example, when the cumulative number of PDSCHs transmitted so far is 8 including the transmitted PDSCH, “8” is indicated as the value of C-DAI.

Note that the various DCI formats may further include fields different from the above-mentioned fields. For example, a field (T-DAI: Total Downlink Assignment Index field) indicating the total number of PDCCHs to be transmitted may be included.

The value of K1 (information or parameter indicated by the timing indicator field from PDSCH to HARQ feedback) indicated by the DCI format contained in the PDCCH may be numerical or non-numerical. ) May be. Here, the numerical value means a value represented by a numerical value, for example, {0, 1, 2, ... .. .. , 15}. A non-numeric value may mean a non-numeric value or may mean no numerical value. Hereinafter, the operation of the numerical K1 value and the non-numeric K1 value will be described. For example, the PDSCH scheduled by the DCI format is transmitted in the base station apparatus 3 in slot n and received in the terminal apparatus 1. When the value of K1 indicated by the DCI format is a numerical value, the terminal device 1 may transmit (report) the HARQ-ACK information corresponding to the PDSCH in the slot n + K1 via the PUCCH or the PUSCH. If the value of K1 indicated by the DCI format is non-numeric, the terminal device 1 may postpone reporting the HARQ-ACK information corresponding to the PDSCH. If the DCI format containing the PDSCH scheduling information indicates a non-numeric value of K1, the terminal device 1 may postpone reporting the HARQ-ACK information corresponding to the PDSCH. For example, the terminal device 1 stores the HARQ-ACK information in a recording medium such as a memory, does not transmit (report) the HARQ-ACK information via the next PUCCH or PUSCH, and does not transmit (report) the HARQ-ACK information other than the above-mentioned DCI format. The transmission of the HARQ-ACK information may be triggered to transmit (report) the HARQ-ACK information based on at least the DCI format.

One physical channel may be mapped to one serving cell. One physical channel may be mapped to one BWP set for one carrier contained in one serving cell.

The terminal device 1 may be set with one or a plurality of control resource sets (CORESET: ControlResourceSET). The terminal device 1 monitors the PDCCH in one or more control resource sets (monitor). Here, monitoring PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of one or more control resource sets. Note that the PDCCH may include one or more sets of PDCCH candidates and / or PDCCH candidates. Monitoring the PDCCH may also include monitoring and detecting the PDCCH and / or the DCI format transmitted via the PDCCH.

The control resource set may be a time frequency domain to which one or more PDCCHs can be mapped. The control resource set may be an area in which the terminal device 1 monitors the PDCCH. The control resource set may be composed of continuous resources (Located resources). The control resource set may be composed of discontinuous resources.

In the frequency domain, the unit of mapping of the control resource set may be a resource block. For example, in the frequency domain, the unit of mapping of the control resource set may be 6 resource blocks. In the time domain, the control resource set mapping unit may be an OFDM symbol. For example, in the time domain, the unit of mapping of the control resource set may be one OFDM symbol.

The mapping of the control resource set to the resource block may be given at least based on the upper layer parameters. The upper layer parameter may include a bitmap for a group of resource blocks (RBG: Resource Block Group). The group of resource blocks may be given by six consecutive resource blocks.

The number of OFDM symbols that make up the control resource set may be given at least based on the upper layer parameters. For example, the start position of the OFDM symbol constituting the control resource set is notified from the base station apparatus 3 to the terminal apparatus 1 by using the signaling of the upper layer. For example, the end position of the OFDM symbol constituting the control resource set is notified from the base station apparatus 3 to the terminal apparatus 1 by using the signaling of the upper layer.

A certain control resource set may be a common control resource set (Common control resource set). The common control resource set may be a control resource set that is commonly set for a plurality of terminal devices 1. The common control resource set may be given at least based on the MIB, the first system information, the second system information, the common RRC signaling, and some or all of the cell IDs. For example, the time resource and / or frequency resource of the control resource set set to monitor the PDCCH used for scheduling the first system information may be given at least based on the MIB.

The control resource set set in the MIB is also called CORESET # 0. CORESET # 0 may be a control resource set with index # 0.

A certain control resource set may be a dedicated control resource set (Dedicated control resource set). The dedicated control resource set may be a control resource set set to be used exclusively for the terminal device 1. The dedicated control resource set may be given at least based on the dedicated RRC signaling and some or all of the values of C-RNTI. A plurality of control resource sets may be configured in the terminal device 1, and an index (control resource set index) may be assigned to each control resource set. One or more control channel elements (CCE) may be configured in the control resource set, and an index (CCE index) may be assigned to each CCE.

CCE may be configured to include a group of one or more REGs. The REG group is also referred to as a REG bundle. The number of REGs that make up one REG group is called the Bundle size. For example, the REG Bundle size may be any of 1, 2, 3, and 6. In interleaved mapping, an interleaver may be applied in units of REG bundles. The terminal device 1 may assume that the precoders applied to the REs in the group of REGs are the same. The terminal device 1 can perform channel estimation on the assumption that the precoders applied to the REs in the group of REGs are the same. On the other hand, the terminal device 1 may assume that the precoders applied to the REs between the REG groups are not the same. In other words, the terminal device 1 does not have to assume that the precoders applied to REs between groups of REGs are the same. "Between REG groups" may be paraphrased as "between two different REG groups". The terminal device 1 can perform channel estimation on the assumption that the precoders applied to REs between groups of REGs are not the same.

The set of PDCCH candidates (PDCCH candidate) monitored by the terminal device 1 is defined from the viewpoint of the search area (Search space). That is, the set of PDCCH candidates monitored by the terminal device 1 is given by the search area.

The search area may be configured to include one or more PDCCH candidates at one or more aggregation levels. The aggregation level of PDCCH candidates may indicate the number of CCEs constituting the PDCCH. PDDCH candidates may be mapped to one or more CCEs.

The number of CCEs that make up the PDCCH candidate is also referred to as the aggregation level (AL). When one PDCCH candidate is composed of agglomeration of a plurality of CCEs, one PDCCH candidate is composed of a plurality of CCEs having consecutive CCE numbers. The set of PDCCH candidates whose aggregation level is AL _X is also referred to as the search region of aggregation level AL _X. That is, the search area of the aggregation level _ALX may be configured to include one or more PDCCH candidates whose aggregation level is _ALX . Further, the search area may include PDCCH candidates at a plurality of aggregation levels. For example, CSS may include multiple aggregation level PDCCH candidates. For example, the USS may include multiple aggregation level PDCCH candidates. A set of aggregation levels of PDCCH candidates included in CSS and a set of aggregation levels of PDCCH candidates included in USS may be specified / set respectively.

The terminal device 1 may monitor at least one or a plurality of search areas in a slot in which DRX (Discontinuation reception) is not set. The DRX may be given at least based on the upper layer parameters. The terminal device 1 may monitor at least one or a plurality of search area sets (Search space set) in a slot in which DRX is not set. A plurality of search area sets may be configured in the terminal device 1. An index (search area set index) may be assigned to each search area set.

The search area set may be configured to include at least one or a plurality of search areas. An index (search area index) may be assigned to each search area.

Each of the search area sets may be associated with at least one control resource set. Each of the search area sets may be included in one control resource set. For each of the search area sets, an index of the control resource set associated with the search area set may be given.

The search area may have two types, CSS (Comon Search Space, common search area) and USS (UE-specific Search Space). The CSS may be a search area commonly set for a plurality of terminal devices 1. The USS may be a search area containing settings that are used exclusively for the individual terminal device 1. The CSS may be given at least based on the sync signal, MIB, first system information, second system information, common RRC signaling, dedicated RRC signaling, cell ID, and the like. USS may be given at least based on dedicated RRC signaling and / or C-RNTI values. The CSS may be a search area set as a common resource (control resource element) for a plurality of terminal devices 1. The USS may be a search area set in a resource (control resource element) for each individual terminal device 1.

CSS is for type 0PDCCH CSS for SI-RNTI scrambled DCI format used to transmit system information in the primary cell, and for RA-RNTI, TC-RNTI scrambled DCI format used for initial access. Type 1 PDCCH CSS may be used. As the CSS, a PDCCH CSS of the type for the DCI format scrambled by CC-RNTI used for Accessed Access may be used. The terminal device 1 can monitor PDCCH candidates in those search areas. The DCI format scrambled by a predetermined RNTI may be a DCI format to which a CRC (Cyclic Redundancy Check) scrambled by a predetermined RNTI is added.

The information related to the reception of the PDCCH may include the information related to the ID indicating the destination of the PDCCH. The ID indicating the destination of the PDCCH may be an ID used for scrambling the CRC bit added to the PDCCH. The ID that indicates the destination of the PDCCH is also referred to as RNTI (Radio Network Temporary Identifier). The information related to the reception of the PDCCH may include the information related to the ID used for scrambling the CRC bit added to the PDCCH. The terminal device 1 can attempt to receive the PDCCH based on at least the information related to the ID contained in the PBCH.

RNTI is SI-RNTI (System Information-RNTI), P-RNTI (Paging-RNTI), C-RNTI (Common-RNTI), Temporary C-RNTI (TC-RNTI), RA-RNTI (Random) , CC-RNTI (Common Control-RNTI), INT-RNTI (Interruption-RNTI) may be included. SI-RNTI is at least used for scheduling PDSCHs transmitted containing system information. P-RNTI is at least used for scheduling PDSCHs transmitted containing information such as paging information and / or system information change notifications. C-RNTI is at least used to schedule user data for the RRC-connected terminal device 1. Temporary C-RNTI is at least used for scheduling random access messages 4. Temporary C-RNTI is at least used to schedule a PDSCH containing data that maps to CCCH in a logical channel. RA-RNTI is at least used for scheduling random access message 2. CC-RNTI is at least used for transmitting and receiving control information of United access. INT-RNTI is at least used to indicate pre-emption on the downlink.

The PDCCH and / or DCI included in the CSS does not include a CIF (Carrier Indicator Field) indicating which serving cell (or which component carrier) the PDCCH / DCI schedules the PDSCH or PUSCH. You may.

When carrier aggregation (CA: carrier aggregation) for aggregating a plurality of serving cells and / or a plurality of component carriers for communication (transmission and / or reception) is set for the terminal device 1, a predetermined value is provided. The PDCCH and / or DCI contained in the USS for a serving cell (predetermined component carrier) includes a CIF indicating which serving cell and / or which component carrier the PDCCH / DCI is scheduling a PDSCH or PUSCH for. May be good.

When communicating with the terminal device 1 using one serving cell and / or one component carrier, the PDCCH / / or DCI included in the USS includes the serving cell and / or the PDCCH / DCI. Alternatively, it may not include a CIF indicating for which component carrier the PDSCH or PUSCH is scheduled.

The common control resource set may include CSS. The common control resource set may include both CSS and USS. The dedicated control resource set may include USS. The dedicated control resource set may include CSS.

The physical resources in the search area are composed of control channel configuration units (CCE: Control Channel Elements). CCE is composed of a predetermined number of resource element groups (REG: Resource Element Group). For example, the CCE may consist of 6 REGs. The REG may be composed of one OFDM symbol of one PRB (Physical Resource Block). That is, the REG may be configured to include 12 resource elements (RE: ResourceElement). PRB is also simply referred to as RB (Resource Block: resource block).

That is, the terminal device 1 can detect the PDCCH and / or DCI for the terminal device 1 by blindly detecting the PDCCH candidate included in the search area in the control resource set.

The number of blind detections for a control resource set in a serving cell and / or component carrier is determined based on the type of search area, the type of aggregation level, and the number of PDCCH candidates for the PDCCH contained in the control resource set. May be done. Here, the type of the search region may include at least one of CSS and / or USS and / or UGSS (UE Group SS) and / or GCSS (Group CSS). The type of aggregation level indicates the maximum aggregation level supported for the CCE constituting the search area, and is at least one of {1, 2, 4, 8, ..., X} (X is a predetermined value). It may be specified / set from the beginning. The number of PDCCH candidates may indicate the number of PDCCH candidates for a certain aggregation level. That is, the number of PDCCH candidates may be defined / set for each of the plurality of aggregation levels. The UGSS may be a search area commonly assigned to one or a plurality of terminal devices 1. The GCSS may be a search region in which a DCI is mapped containing parameters related to CSS for one or more terminal devices 1. The aggregation level indicates the aggregation level of a predetermined number of CCEs, and is related to the total number of CCEs constituting one PDCCH and / or the search area.

Note that the size of the aggregation level may be associated with the size of the coverage corresponding to the PDCCH and / or the search area or the DCI contained in the PDCCH and / or the search area (DCI format size, payload size).

When the start position (start symbol) of the OFDM symbol of the PDCCH is set for one control resource set, and more than one PDCCH in the control resource set can be detected in a predetermined period. In the case of, the type of the search area for the PDCCH included in the control resource set, the type of the aggregation level, and the number of PDCCH candidates may be set for the time domain corresponding to each start symbol. The type of search area, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set for each control resource set, and the DCI and / or the upper layer signal (RRC signaling) may be set. ) May be provided / set, or may be specified / set in advance by the specifications. The number of PDCCH candidates may be the number of PDCCH candidates for a predetermined period. The predetermined period may be 1 millisecond. The predetermined period may be 1 microsecond. Further, the predetermined period may be a period of one slot. Further, the predetermined period may be the period of one OFDM symbol.

When there are more than one start position (start symbol) of the OFDM symbol of PDCCH for one control resource set, that is, when there are a plurality of timings for blind detection (monitoring) of PDCCH in a predetermined period. May set the type of search area for PDCCH included in the control resource set, the type of aggregation level, and the number of PDCCH candidates for the time domain corresponding to each start symbol. The type of search area, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set for each control resource set, and may be set via the DCI and / or the signal of the upper layer. It may be provided / set, or it may be specified / set in advance by the specifications.

As a method of indicating the number of PDCCH candidates, the number to be reduced from the predetermined number of PDCCH candidates may be defined / set for each aggregation level.

The terminal device 1 may transmit / notify the base station device 3 of the capability information related to the blind detection. The terminal device 1 may transmit / notify the base station device 3 of the number of PDCCH candidates that can be processed in one subframe as capability information regarding the PDCCH. If the terminal device 1 can set more control resource sets than a predetermined number for one or more serving cells / component carriers, the terminal device 1 may transmit / notify the base station device 3 of the capability information related to the blind detection. good.

The terminal device 1 transmits capacity information related to blind detection to the base station device 3 when a predetermined number of control resource sets can be set for a predetermined period of one or more serving cells / component carriers. You may notify.

The ability information related to the blind detection may include information indicating the maximum number of blind detections in a predetermined period. In addition, the ability information related to the blind detection may include information indicating that the PDCCH candidates can be reduced. In addition, the capability information related to the blind detection may include information indicating the maximum number of control resource sets that can be blind detected in a predetermined period. The maximum number of control resource sets and the maximum number of serving cells and / or component carriers capable of monitoring PDCCH may be set as individual parameters or may be set as common parameters, respectively. In addition, the capability information related to the blind detection may include information indicating the maximum number of control resource sets that can simultaneously perform the blind detection in a predetermined period.

If the terminal device 1 does not support the ability to detect more control resource sets (blind detection) than a predetermined number in a predetermined period, the terminal device 1 transmits / notifies the ability information related to the blind detection. It does not have to be. When the base station apparatus 3 does not receive the capability information related to the blind detection, the base station apparatus 3 may set the control resource set so as not to exceed a predetermined number for the blind detection and transmit the PDCCH. ..

The settings related to the control resource set include a parameter indicating an index (ControlResourceSetId) that identifies the control resource set. Further, the setting related to the control resource set may include a parameter indicating the frequency resource area (the number of resource blocks constituting the control resource set) of the control resource set. In addition, the settings related to the control resource set may include a parameter indicating the type of mapping from CCE to REG. Also, the settings related to the control resource set may include the REG bundle size. RRC signaling may be used to send and receive messages indicating settings for the control resource set. SIBs may be used to send and receive messages indicating settings related to control resource sets. The MIB may be used to send and receive messages indicating settings related to the control resource set.

The settings related to the search area include a parameter indicating an index that identifies the search area (search area index). The settings for the search area include parameters that indicate the index of the control resource set in which the search area is located. The settings related to the search area may include parameters indicating the period and offset of the slot in which the search area is arranged. The setting regarding the search area may include a parameter indicating the number of slots in which the search area is continuously arranged. The settings related to the search area may include a parameter indicating an OFDM symbol in the slot in which PDCCH candidates are monitored. The settings for the search area may include a parameter indicating the number of PDCCH candidates to be monitored for each CCE aggregation level. The setting related to the search area may include a parameter indicating the DCI format in which monitoring is performed. The settings for the search area may include parameters indicating the type of search area (CSS or USS). RRC signaling may be used to send and receive messages indicating settings relating to the search area. SIBs may be used to send and receive messages indicating settings related to the search area. A MIB may be used to send and receive messages indicating settings related to the search area.

PDSCH is at least used to send / receive transport blocks. The PDSCH may at least be used to send / receive a random access message 2 (random access response). The PDSCH may at least be used to transmit / receive system information, including parameters used for initial access. The PDSCH may at least be used to send / receive the random access message 4.

In FIG. 1, in downlink wireless communication, the following downlink physical signals are used. The downlink physical signal does not have to be used to transmit the information output from the upper layer, but it is used by the physical layer.
-Synchronization signal (SS: Synchronization signal)
-DL DMRS (Downlink DeModulation Reference Signal)
-CSI-RS (Channel State Information-Reference Signal)
-DL PTRS (DownLink Phase Tracking Reference Signal)

The synchronization signal is used by the terminal device 1 to synchronize the downlink frequency domain and / or the time domain. The synchronization signal includes PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

The SS block (SS / PBCH block) is composed of PSS, SSS, and at least a part or all of PBCH.

DL DMRS is associated with the transmission of PBCH, PDCCH, and / or PDSCH. DL DMRS is multiplexed with PBCH, PDCCH, and / or PDSCH. The terminal device 1 may use the PBCH, the PDCCH, or the DL DMRS corresponding to the PDSCH to correct the propagation path of the PBCH, PDCCH, or PDSCH. The terminal device 1 may determine that the base station device 3 is transmitting a signal based on the detection of DL DMRS.

CSI-RS may be at least a signal used to calculate channel state information. The pattern of CSI-RS assumed by the terminal device 1 may be given by at least the upper layer parameter.

The PTRS may be at least a signal used to compensate for phase noise. The pattern of PTRS assumed by the terminal device 1 may be given at least based on the upper layer parameters and / or DCI.

The DL PTRS may be associated with a DL DMRS group that includes at least the antenna ports used for one or more DL DMRS.

Note that downlink physical signals not described above may be used.

The downlink physical channel and the downlink physical signal are also referred to as a downlink physical signal. Uplink physical channels and uplink physical signals are also referred to as uplink signals. The downlink signal and the uplink signal are collectively referred to as a physical signal. The downlink signal and the uplink signal are also collectively referred to as a signal. The downlink physical channel and the uplink physical channel are collectively referred to as a physical channel. The downlink physical signal and the uplink physical signal are collectively referred to as a physical signal.

BCH (Broadcast Channel), UL-SCH (Uplink-SharedChannel) and DL-SCH (Downlink-SharedChannel) are transport channels. The channel used in the medium access control (MAC) layer is called a transport channel. The unit of the transport channel used in the MAC layer is also called a transport block (TB) or a MAC PDU. HARQ (Hybrid Automatic Repeat request) is controlled for each transport block in the MAC layer. A transport block is a unit of data that the MAC layer passes to the physical layer (deliver). In the physical layer, the transport block is mapped to a codeword, and modulation processing is performed for each codeword.

The base station device 3 and the terminal device 1 exchange (transmit / receive) signals of the upper layer in the upper layer (higher layer). For example, the base station device 3 and the terminal device 1 may perform RRC signaling (RRC message: Radio Response Control message; RRC information: Radio Resolution) in the radio resource control (RRC: Radio Resource Control) layer. .. Further, the base station device 3 and the terminal device 1 may transmit and receive MAC CE (Control Elements) in the MAC layer. Here, RRC signaling and / or MAC CE is also referred to as a higher layer signal (higherlayer signaling).

PUSCH and PDSCH may at least be used to transmit RRC signaling and / or MAC CE. Here, the RRC signaling transmitted from the base station device 3 by PDSCH may be a signal common to a plurality of terminal devices 1 in the serving cell. Signaling common to a plurality of terminal devices 1 in a serving cell is also referred to as common RRC signaling. The RRC signaling transmitted from the base station apparatus 3 by PDSCH may be a dedicated signaling (also referred to as directed signaling or UE specific signaling) to a certain terminal apparatus 1. The signaling dedicated to the terminal device 1 is also referred to as dedicated RRC signaling. The upper layer parameters unique to the serving cell may be transmitted / received using a signaling common to a plurality of terminal devices 1 in the serving cell or a dedicated signaling to a certain terminal device 1. UE-specific upper layer parameters may be transmitted / received using dedicated signaling to a certain terminal device 1.

BCCH (Broadcast Control Channel), CCCH (Control Control Channel), and DCCH (Dedicated Control Channel) are logical channels. For example, BCCH is a higher layer channel used to transmit / receive MIBs. Further, CCCH (Common Control Channel) is an upper layer channel used for transmitting / receiving common information in a plurality of terminal devices 1. Here, CCCH may be used, for example, for a terminal device 1 that is not RRC-connected. Further, the DCCH (Dedicated Control Channel) is a channel of at least an upper layer used for transmitting / receiving dedicated control information (designated Control Information) to the terminal device 1. Here, the DCCH may be used, for example, for the terminal device 1 connected by RRC.

BCCH in the logical channel may be mapped to BCH, DL-SCH, or UL-SCH in the transport channel. CCCH on the logical channel may be mapped to DL-SCH or UL-SCH on the transport channel. DCCH in the logical channel may be mapped to DL-SCH or UL-SCH in the transport channel.

UL-SCH in the transport channel may be mapped to PUSCH in the physical channel. The DL-SCH in the transport channel may be mapped to the PDSCH in the physical channel. BCH in the transport channel may be mapped to PBCH in the physical channel.

The REG may be composed of one OFDM symbol of one PRB. That is, the REG may be composed of 12 consecutive REs in the frequency domain. A part of the plurality of REs constituting the REG may be an RE to which the downlink control information is not mapped. The REG may be configured to include a RE to which the downlink control information is not mapped, or may be configured to include a RE to which the downlink control information is not mapped. The RE to which the downlink control information is not mapped may be a RE to which a reference signal is mapped, a RE to which a channel other than the control channel is mapped, or a terminal device in which the control channel is not mapped. It may be RE assumed by 1.

CCE may be composed of 6 REGs. The CCE may be composed of continuously mapped REGs (such mappings may be referred to as Localized mapping) (such mappings may be referred to as non-interleaved CCE-to-REG mapping). (Such mapping may be referred to as non-interleaved mapping). It should be noted that not all REGs constituting the CCE are necessarily continuous in the frequency domain. For example, if all of the plurality of resource blocks constituting the control resource set are not continuous in the frequency domain, even if the numbers assigned to the REGs are continuous, each resource block constituting each REG having consecutive numbers is Not continuous in the frequency domain. When a control resource set consists of multiple OFDM symbols and multiple REGs constituting one CCE are arranged over multiple time intervals (OFDM symbols), the CCE is composed of a group of continuously mapped REGs. You may.

The CCE may be composed of discontinuously mapped REGs (such mappings may be referred to as Distributed mapping) (such mappings may be referred to as interleaved CCE-to-REG mapping) (. Such mapping may be referred to as interleaved mapping). The REGs that make up the CCE using the interleaver may be discontinuously mapped to resources in the time frequency domain. When a control resource set is composed of multiple OFDM symbols and multiple REGs constituting one CCE are arranged over a plurality of time intervals (OFDM symbols), the CCE is a mixture of REGs of different time intervals (OFDM symbols). And may consist of REGs that are discontinuously mapped. The CCE may be composed of REGs that are distributed and mapped in groups of a plurality of REGs. The CCE may be composed of REGs that are distributed and mapped in groups of a plurality of REGs.

For example, PDCCH candidates are mapped to one OFDM symbol, and three REG groups (REG groups) including two REGs are configured for one PDCCH candidate. That is, one REG group is composed of two REGs. The number of REGs that make up a group of REGs in the frequency domain may include a divisor of the number of PRBs mapped in the frequency direction. The number of REGs that make up a group of REGs in the frequency domain may be 1, 2, 3, or 6. For example, PDCCH candidates are mapped to two OFDM symbols, and three groups of REGs containing two REGs are configured for one PDCCH candidate. The number of REGs constituting the group of REGs in the frequency domain may be either 1 or 3.

The RRC idle terminal device 1 may attempt to establish a connection with at least one cell of the base station device 3. Here, the cell to which the terminal device 1 tries to connect is also referred to as a target cell. FIG. 5 is a diagram showing an example of an initial connection procedure (4-step contention based RACH process) according to one aspect of the present embodiment. The initial connection procedure comprises at least a portion of steps 5101-5104.

The terminal device 1 performs downlink time-frequency synchronization prior to the implementation of step 5101. In the first state, a synchronization signal is used for the terminal device 1 to perform downlink time-frequency synchronization.

The synchronization signal may be transmitted including the ID of the target cell (cell ID). The synchronization signal may be transmitted including a sequence generated at least based on the cell ID. The inclusion of the sync signal in the cell ID may mean that a sequence of sync signals is given based on the cell ID. The synchronization signal may be beam (or precoder) applied and transmitted.

The beam shows a phenomenon in which the antenna gain differs depending on the direction. The beam may be given at least based on the directivity of the antenna. Also, the beam may be given at least based on the phase conversion of the carrier signal. The beam may also be provided by applying a precoder.

The terminal device 1 receives the PBCH transmitted from the target cell. The PBCH may be transmitted including an important information block (MIB: Master Information Block, EIB: Essential Information Block) containing important system information used for the terminal device 1 to connect to the target cell. The important information block is system information. The critical information block may contain information about the radio frame number. The important information block may include information about a position in a super frame composed of a plurality of radio frames (for example, information indicating at least a part of a system frame number (SFN: System Frame Number) in the super frame). The PBCH may also include an index of the sync signal. The PBCH may include information related to the reception of the PDCCH. Important information blocks may be mapped to BCH on the transport channel. The important information block may be mapped to BCCH in the logical channel.

The base station device 3 can transmit the PBCH including the information related to the reception of the PDCCH and instruct the terminal device 1 to monitor the common control resource set. The terminal device 1 monitors the common control resource set at least based on detecting the information related to the reception of the PDCCH contained in the PBCH. The common control resource set is at least used for scheduling the first system information (RMSI, OSI). The first system information may include important system information for the terminal device 1 to connect to the target cell. The first system information may include information about various settings of the downlink. The first system information may include information about various settings of PRACH. The first system information may include information about various uplink settings. The first system information may include signal waveform information (OFDM or DFT-s-OFDM) set for random access message 3 transmission. The first system information may include at least a part of the system information other than the information contained in the MIB. The first system information may be mapped to BCH in the transport channel. The first system information may be mapped to BCCH in the logical channel. The first system information may include at least SIB1 (System Information Block type 1). The first system information may include at least SIB2 (System Information Block type2). The common control resource set may be used for scheduling random access message 2. It should be noted that SIB1 may include information regarding measurements necessary for making an RRC connection. The SIB 2 may also include information about channels that are common and / or shared among the plurality of terminal devices 1 in the cell.

Step 5102 is a step in which the base station device 3 responds to the random access message 1 to the terminal device 1. The response is also referred to as random access message 2. The random access message 2 may be transmitted via the PDSCH. The PDSCH containing the random access message 2 is scheduled by the PDCCH. The CRC bit contained in the PDCCH may be scrambled by RA-RNTI. The random access message 2 may be transmitted including a special uplink grant. The special uplink grant is also referred to as a random access response grant. The special uplink grant may be included in the PDSCH containing the random access message 2. The random access response grant may include at least Temporary C-RNTI.

The base station device 3 can transmit the MIB, the first system information, and / or the second system information, and instruct the terminal device 1 to monitor the common control resource set. The second system information may include information related to the reception of PDCCH. The terminal device 1 monitors the common control resource set based on at least the information related to the reception of PDCCH contained in the MIB, the first system information, and / or the second system information. The CRC bit added to the PDCCH may be scrambled by Temporary C-RNTI. The common control resource set may be used for scheduling random access message 2.

Step 5103 is a step in which the terminal device 1 transmits a request for RRC connection to the target cell. The RRC connection request is also referred to as a random access message 3. The random access message 3 may be transmitted via the PUSCH scheduled by the random access response grant. The random access message 3 may include an ID used for identifying the terminal device 1. The ID may be an ID managed by an upper layer. The ID may be S-TMSI (SAE Temporary Mobile Subscriber Identity). The ID may be mapped to CCCH in the logical channel.

Step 5104 is a step in which the base station apparatus 3 transmits a collision resolution message (Contention resolution message) to the terminal apparatus 1. The conflict resolution message is also referred to as a random access message 4. After transmitting the random access message 3, the terminal device 1 monitors the PDCCH that schedules the PDSCH including the random access message 4. The random access message 4 may include a collision avoidance ID. Here, the collision avoidance ID is used to solve a collision in which a plurality of terminal devices 1 transmit signals using the same radio resource. The collision avoidance ID is also referred to as a UE content resolution identity.

In step 5104, the terminal device 1 that has transmitted the random access message 3 including the ID (for example, S-TMSI) used for identifying the terminal device 1 monitors the random access message 4 including the collision resolution message. When the collision avoidance ID included in the random access message 4 is equal to the ID used for identifying the terminal device 1, the terminal device 1 considers that the collision resolution has been completed successfully, and the C-RNTI field. May be set to the value of Temporary C-RNTI. The terminal device 1 in which the value of Temporary C-RNTI is set in the C-RNTI field is considered to have completed the RRC connection.

The terminal device 1 transmits HARQ-ACK, which is an error detection result for the transport block included in the PDSCH including the random access message 4, by PUCCH.

The control resource set for monitoring the PDCCH that schedules the random access message 4 may be a common control resource set. The base station apparatus 3 can include information related to the reception of the PDCCH in the random access message 2 and transmit the information, and can instruct the terminal apparatus 1 to monitor the common control resource set. The terminal device 1 monitors the PDCCH based on at least the information related to the reception of the PDCCH included in the random access message 2.

The RRC-connected terminal device 1 can receive the dedicated RRC signaling mapped to the DCCH in the logical channel. The base station apparatus 3 can transmit a dedicated RRC signaling including information related to the reception of the PDCCH, and can instruct the terminal apparatus 1 to monitor the individual control resource set. The terminal device 1 monitors the PDCCH based on at least the information related to the reception of the PDCCH included in the dedicated RRC signaling. Further, the base station apparatus 3 can transmit a dedicated RRC signaling including information related to the reception of the PDCCH, and can instruct the terminal apparatus 1 to monitor the common control resource set. The terminal device 1 monitors the PDCCH including CC-RNTI in the common control resource set.

The base station device 3 can transmit a random access message 4 including information related to the reception of the PDCCH, and instruct the terminal device 1 to monitor the individual control resource set. When the random access message 4 contains information related to the reception of the PDCCH, the terminal device 1 may monitor the individual control resource set based on at least the information related to the reception of the PDCCH.

The common control resource set may be composed of not only one type but also a plurality of types. Depending on the application, a plurality of common control resource sets may be configured independently. For example, a common control resource set for transmitting and receiving PDCCH including CC-RNTI and a common control resource set for transmitting and receiving PDCCH including SI-RNTI may be independently configured.

Hereinafter, a configuration example of the terminal device 1 according to one aspect of the present embodiment will be described.

FIG. 6 is a schematic block diagram showing the configuration of the terminal device 1 according to one embodiment of the present embodiment. As shown in the figure, the terminal device 1 includes a wireless transmission / reception unit 10 and an upper layer processing unit 14. The radio transmission / reception unit 10 includes at least a part or all of an antenna unit 11, an RF (Radio Frequency) unit 12, and a baseband unit 13. The upper layer processing unit 14 includes at least a part or all of the medium access control layer processing unit 15 and the radio resource control layer processing unit 16. The wireless transmission / reception unit 10 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

The physical layer processing unit includes the decoding unit. The receiving unit (also referred to as a receiving processing unit) of the terminal device 1 receives the PDCCH. The decoding unit of the terminal device 1 decodes the received PDCCH. More specifically, the decoding unit of the terminal device 1 performs blind decoding processing on the received signal of the resource corresponding to the PDCCH candidate of USS. The decoding unit of the terminal device 1 performs brand decoding processing on the received signal of the resource corresponding to the PDCCH candidate of CSS. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set. The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set.

The reception processing unit of the terminal device 1 monitors PDCCH candidates in the control resource set of the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3. The receiving unit of the terminal device 1 receives the PDSCH. The reception processing unit of the terminal device 1 performs a process of receiving the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3. The reception processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDSCH. The reception processing unit of the terminal device 1 generates HARQ-ACK for the decoded PDSCH.

The reception processing unit of the terminal device 1 measures the reception quality. For example, the reception quality is RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), and RSSI (Received Signal Strength Indicator). The reception processing unit of the terminal device 1 may apply the averaging process to the reception quality. The reception processing unit of the terminal device 1 measures the reception quality based on the SS block. The reception processing unit of the terminal device 1 measures the reception quality based on CSI-RS. The reception processing unit of the terminal device 1 outputs the measured reception quality to the transmission processing unit.

The transmission unit (also referred to as a transmission processing unit) of the terminal device 1 transmits a random access preamble. The transmission processing unit of the terminal device 1 transmits a random access preamble using PRACH. In the transmission processing unit of the terminal device 1, information indicating one or more random access preambles for coverage expansion is input from the upper layer processing unit 14. The transmission processing unit of the terminal device 1 inputs information indicating a threshold value of reception quality, such as whether or not to select a random access preamble for coverage expansion from the upper layer processing unit 14. The reception quality measured from the reception processing unit is input to the transmission processing unit of the terminal device 1. The transmission processing unit of the terminal device 1 determines the selection of the random access preamble for coverage expansion based on the reception quality input from the reception processing unit and the threshold value set based on the information from the upper layer processing unit 14. .. The transmission processing unit of the terminal device 1 selects a random access preamble for coverage expansion when the reception quality input from the reception processing unit is smaller than (or less than or equal to) the set threshold value. The transmission processing unit of the terminal device 1 performs a random access preamble (first random access preamble) for covering coverage when the reception quality input from the reception processing unit is equal to or higher than the set threshold value (or larger than the threshold value). Do not select, but select a random access preamble (second random access preamble) that is different from the random access preamble for coverage expansion.

When the random access preamble for coverage expansion is selected, the transmission processing unit of the terminal device is set to use π / 2 BPSK (first modulation method) for the PUSCH of the message 3. When the random access preamble for coverage expansion is not selected, the transmission processing unit of the terminal device is set to use BPSK, QPSK, or 16QAM (second modulation method) for the PUSCH of message 3. ..

When the random access preamble for coverage expansion is selected, the transmission processing unit of the terminal device is set to use π / 2 BPSK (first modulation method) for PUCCH for PDSCH of message 4. When the random access preamble for coverage expansion is not selected, the transmission processing unit of the terminal device is set to use either BPSK or QPSK (second modulation method) for PUCCH for PDSCH of message 4. .. The transmission processing unit of the terminal device transmits HARQ-ACK using the PUCCH for the PDSCH of the message 4.

The transmission unit (also referred to as a transmission processing unit) of the terminal device 1 transmits HARQ-ACK. The transmission processing unit of the terminal device 1 transmits HARQ-ACK to the PDSCH. The transmission processing unit of the terminal device 1 transmits HARQ-ACK in the uplink frequency band (cell, component carrier, carrier) managed by the base station device 3. The transmission processing unit of the terminal device 1 transmits HARQ-ACK to the PDSCH of the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3. The transmission processing unit of the terminal device 1 manages the HARQ-ACK for the PDSCH of the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3 in the uplink frequency band (cell) managed by the base station device 3. , Component carrier, carrier).

The upper layer processing unit 14 outputs the uplink data (transport block) generated by the user's operation or the like to the wireless transmission / reception unit 10. The upper layer processing unit 14 processes the MAC layer, the packet data integration protocol (PDCP: Packet Data Convergence Protocol) layer, the wireless link control (RLC: Radio Link Control) layer, and the RRC layer.

The medium access control layer processing unit 15 included in the upper layer processing unit 14 processes the MAC layer.

The radio resource control layer processing unit 16 included in the upper layer processing unit 14 processes the RRC layer. The wireless resource control layer processing unit 16 manages various setting information / parameters of its own device. The radio resource control layer processing unit 16 sets various setting information / parameters based on the signal of the upper layer received from the base station apparatus 3. That is, the radio resource control layer processing unit 16 sets various setting information / parameters based on the information indicating various setting information / parameters received from the base station apparatus 3. The setting information may include information related to processing or setting of a physical channel, a physical signal (that is, a physical layer), a MAC layer, a PDCP layer, an RLC layer, and an RRC layer. The parameter may be an upper layer parameter.

The radio resource control layer processing unit 16 sets the Random access configuration based on the RRC signaling (system information) received from the base station device 3. The radio resource control layer processing unit 16 sets one or more random access preambles for coverage expansion based on RRC signaling (system information). The radio resource control layer processing unit 16 sets a threshold value used for determining the selection of the random access preamble for coverage expansion based on RRC signaling (system information).

The radio resource control layer processing unit 16 sets the control resource set based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets a search area in the control resource set. The radio resource control layer processing unit 16 sets PDCCH candidates to be monitored in the control resource set. The radio resource control layer processing unit 16 sets the number of PDCCH candidates monitored in the control resource set. The radio resource control layer processing unit 16 sets the Aggregation level of PDCCH candidates monitored in the control resource set.

The wireless transmission / reception unit 10 performs physical layer processing such as modulation, demodulation, coding, and decoding. The wireless transmission / reception unit 10 separates, demodulates, and decodes the received physical signal, and outputs the decoded information to the upper layer processing unit 14. The wireless transmission / reception unit 10 generates a physical signal by modulating, encoding, and generating a baseband signal (converting to a time continuous signal), and transmits the physical signal to the base station device 3.

The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal by orthogonal demodulation (down-convert), and removes unnecessary frequency components. The RF unit 12 outputs the processed analog signal to the baseband unit.

The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes a portion corresponding to a CP (Cyclic Prefix) from the converted digital signal, performs a fast Fourier transform (FFT: Fast Fourier Transform) on the signal from which the CP has been removed, and outputs a signal in the frequency domain. Extract.

The baseband unit 13 performs inverse fast Fourier transform (IFFT) on the data to generate an OFDM symbol, adds CP to the generated OFDM symbol, generates a baseband digital signal, and basebands the data. Converts a band digital signal to an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

The RF unit 12 removes an extra frequency component from the analog signal input from the baseband unit 13 using a low-pass filter, upconverts the analog signal to the carrier frequency, and transmits the analog signal via the antenna unit 11. do. Further, the RF unit 12 amplifies the electric power. Further, the RF unit 12 may have a function of controlling the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

The terminal device 1 sets a random access preamble (first random access preamble) for coverage expansion and a random access preamble (second random access preamble) different from the random access preamble for coverage expansion. The terminal device 1 determines the selection of the random access preamble for coverage expansion based on the reception quality. When the random access preamble for coverage expansion is selected, the terminal device 1 sets π / 2 BPSK (first modulation method) for the PUSCH of the message 3. When the random access preamble for coverage expansion is selected, the terminal device 1 sets π / 2 BPSK (first modulation method) for the PUCCH used for transmitting the HARQ-ACK to the PDSCH of the message 4. When the random access preamble for coverage expansion is not selected, the terminal device 1 sets any one of BPSK, QPSK, and 16QAM (second modulation method) for the PUSCH of the message 3. When the random access preamble for coverage expansion is not selected, the terminal device 1 sets either BPSK or QPSK (second modulation method) for the PUCCH used for transmitting HARQ-ACK to the PDSCH of the message 4. do.

Hereinafter, a configuration example of the base station device 3 according to one aspect of the present embodiment will be described.

FIG. 7 is a schematic block diagram showing the configuration of the base station device 3 according to one embodiment of the present embodiment. As shown in the figure, the base station apparatus 3 includes a radio transmission / reception unit 30 and an upper layer processing unit 34. The wireless transmission / reception unit 30 includes an antenna unit 31, an RF unit 32, and a baseband unit 33. The upper layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The wireless transmission / reception unit 30 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

The upper layer processing unit 34 processes the MAC layer, the PDCP layer, the RLC layer, and the RRC layer.

The medium access control layer processing unit 35 included in the upper layer processing unit 34 processes the MAC layer.

The radio resource control layer processing unit 36 included in the upper layer processing unit 34 processes the RRC layer. The wireless resource control layer processing unit 36 generates downlink data (transport block), system information, RRC message, MAC CE, etc. arranged in the PDSCH, or acquires them from an upper node and outputs them to the wireless transmission / reception unit 30. .. Further, the radio resource control layer processing unit 36 manages various setting information / parameters of each terminal device 1. The wireless resource control layer processing unit 36 may set various setting information / parameters for each terminal device 1 via a signal of the upper layer. That is, the radio resource control layer processing unit 36 transmits / notifies information indicating various setting information / parameters. The setting information may include information related to processing or setting of a physical channel, a physical signal (that is, a physical layer), a MAC layer, a PDCP layer, an RLC layer, and an RRC layer. The parameter may be an upper layer parameter.

The wireless resource control layer processing unit 36 sets the configuration of Random access. The radio resource control layer processing unit 36 sets one or more random access preambles for coverage expansion. The radio resource control layer processing unit 36 sets a threshold value used for determining the selection of the random access preamble for coverage expansion in the terminal device 1.

The wireless resource control layer processing unit 36 sets a control resource set for the terminal device 1. Multiple PDCCH candidates are configured (set) within the set control resource set. The radio resource control layer processing unit 36 sets a search area for the terminal device 1.

The wireless resource control layer processing unit 36 sets resources for transmitting HARQ-ACK. The radio resource control layer processing unit 36 sets the PUCCH resource for transmitting the HARQ-ACK for covering coverage. The radio resource control layer processing unit 36 sets a PUCCH resource for HARQ-ACK transmission, which is different from the PUCCH resource for transmission of HARQ-ACK for coverage expansion. The radio resource control layer processing unit 36 of the base station apparatus 3 sets a resource for transmitting HARQ-ACK to the PDSCH of the downlink frequency band (cell, component carrier, carrier). The radio resource control layer processing unit 36 of the base station apparatus 3 transfers the resource for transmitting HARQ-ACK to the PDSCH of the downlink frequency band (cell, component carrier, carrier) to the uplink frequency band (cell, component carrier, carrier). Set to.

Since the function of the wireless transmission / reception unit 30 is the same as that of the wireless transmission / reception unit 10, the description thereof will be omitted as appropriate. Further, the wireless transmission / reception unit 30 grasps the SS (Search space: search area) configured in the terminal device 1. The wireless transmission / reception unit 30 grasps the search area in the control resource set configured in the terminal device 1. The wireless transmission / reception unit 30 grasps the PDCCH candidate monitored by the terminal device 1 and grasps the search area. The wireless transmission / reception unit 30 grasps which control channel element each PDCCH candidate monitored in the terminal device 1 is composed of (the number of the control channel element in which the PDCCH candidate is composed is grasped). The wireless transmission / reception unit 30 includes an SS grasping unit, and the SS grasping unit grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates in the control resource set configured as the search space of the terminal device. The SS grasping unit grasps PDCCH candidates (number of PDCCH candidates, PDCCH candidate numbers) configured in the search area of the control resource set of the terminal device 1.

The SS grasping unit grasps the configuration of the search area in the control resource set (the number of PDCCH candidates, the OFDM symbol of the PDCCH candidate, the Aggregation level of the PDCCH candidate). The transmission unit of the wireless transmission / reception unit 30 transmits PDCCH to the terminal device 1 using the PDCCH candidate in the search area of the control resource set.

The receiving unit (also referred to as the receiving processing unit) of the base station device 3 detects the random access preamble. The reception processing unit of the base station apparatus 3 detects a random access preamble (first random access preamble) for expanding coverage. The reception processing unit of the base station apparatus 3 detects a random access preamble (second random access preamble) different from the random access preamble for covering coverage. The reception processing unit of the base station apparatus 3 receives the PUSCH to which the π / 2 BPSK (first modulation method) is applied as the message 3. The reception processing unit of the base station apparatus 3 receives the PUSCH to which any of BPSK, QPSK, and 16QAM (second modulation method) is applied as the message 3. When the reception processing unit of the base station apparatus 3 detects a random access preamble for covering coverage, it demodulates the PUSCH transmitted as the message 3 using π / 2BPSK. When the reception processing unit of the base station apparatus 3 detects the random access preamble for coverage expansion, the reception processing unit receives the PUSCH to which π / 2 BPSK is applied as the message 3. When the reception processing unit of the base station apparatus 3 detects a random access preamble different from the random access preamble for covering coverage, it demodulates the PUSCH transmitted as message 3 using any of BPSK, QPSK, and 16QAM. I do. When the reception processing unit of the base station apparatus 3 detects a random access preamble different from the random access preamble for covering coverage, the reception processing unit receives the PUSCH to which any of BPSK, QPSK, and 16QAM is applied as message 3.

The reception processing unit of the base station apparatus 3 receives the PUCCH to which the π / 2 BPSK (first modulation method) is applied as the PUCCH for transmitting and receiving HARQ-ACK to the PDSCH of the message 4. The reception processing unit of the base station apparatus 3 receives the PUCCH to which any of BPSK, QPSK, and 16QAM (second modulation method) is applied as the PUCCH for transmitting and receiving HARQ-ACK to the PDSCH of the message 4. When the reception processing unit of the base station apparatus 3 detects a random access preamble for covering coverage, it demodulates the PUCCH including HARQ-ACK for the PDSCH of the message 4 using π / 2 BPSK. When the reception processing unit of the base station apparatus 3 detects the random access preamble for coverage expansion, the reception processing unit receives the PUCCH to which π / 2 BPSK is applied as a PUCCH including HARQ-ACK for the PDSCH of the message 4. When the reception processing unit of the base station apparatus 3 detects a random access preamble different from the random access preamble for coverage expansion, it is either BPSK, QPSK, or 16QAM for PUCCH including HARQ-ACK for PDSCH of message 4. Is used for demodulation. When the reception processing unit of the base station apparatus 3 detects a random access preamble different from the random access preamble for coverage expansion, the PUCCH to which any of BPSK, QPSK, and 16QAM is applied is subjected to HARQ-ACK for the PDSCH of the message 4. Is received as a PUCCH containing.

The receiving unit (also referred to as the receiving processing unit) of the base station device 3 receives HARQ-ACK. The reception processing unit of the base station apparatus 3 receives HARQ-ACK for the PDSCH. The reception processing unit of the base station apparatus 3 receives HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The reception processing unit of the base station apparatus 3 receives HARQ-ACK for the PDSCH of the downlink frequency band (cell, component carrier, carrier). The reception processing unit of the base station apparatus 3 receives HARQ-ACK for the PDSCH of the downlink frequency band (cell, component carrier, carrier) in the uplink frequency band (cell, component carrier, carrier).

Each portion of the terminal device 1 with reference numerals 10 to 16 may be configured as a circuit. Each of the portions of the base station apparatus 3 with reference numerals 30 to 36 may be configured as a circuit.

The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI to the PUCCH and transmit it. The terminal device 1 may multiplex the UCI to the PUSCH and transmit it. UCI uses downlink channel state information (ChannelState Information: CSI), scheduling request indicating a PUSCH resource request (Scheduling Request: SR), and downlink data (Transport block, Medium Access PDU PDU Protocol: Protocol Digital It may include at least one of HARQ-ACK (Hybrid Automatic Repeat ACKnowledgement) for Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH.

HARQ-ACK may also be referred to as ACK / NACK, HARQ feedback, HARQ-ACK feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information. ..

If the downlink data is successfully decrypted, an ACK for the downlink data is generated. If the downlink data is not successfully decoded, a NACK is generated for the downlink data. The HARQ-ACK may include at least the HARQ-ACK bits corresponding to at least one transport block. The HARQ-ACK bit may indicate ACK (ACKnowledgement) or NACK (Negative-ACKnowledgement) corresponding to one or more transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook containing one or more HARQ-ACK bits. The fact that the HARQ-ACK bit corresponds to one or more transport blocks may mean that the HARQ-ACK bit corresponds to a PDSCH containing the one or more transport blocks.

HARQ control for one transport block may be called a HARQ process. One HARQ process identifier may be given for each HARQ process. The DCI format contains a field indicating the HARQ process identifier.

NDI (New Data Indicator) is shown in DCI format for each HARQ process. For example, the NDI field is included in the DCI format (DL assert) containing the PDSCH scheduling information. The NDI field is 1 bit. The terminal device 1 stores (stores) the value of NDI for each HARQ process. The base station device 3 stores (stores) the NDI value for each HARQ process for each terminal device 1. The terminal device 1 updates the stored NDI value using the detected DCI format NDI field. The base station apparatus 3 sets the updated NDI value or the non-updated NDI value in the NDI field of the DCI format and transmits it to the terminal apparatus 1. The terminal device 1 updates the value of the NDI stored using the detected DCI format NDI field for the detected HARQ process corresponding to the value of the detected DCI format HARQ process identifier field.

The terminal device 1 determines whether the received transport block is a new transmission or a retransmission based on the value of the NDI field of the DCI format (DL assignment). The terminal device 1 compares the value of the previously received NDI to the transport block of a HARQ process, and if the value of the detected DCI format NDI field is toggled, the received transport block is Judge that it is a new transmission. When the base station apparatus 3 transmits a transport block for new transmission in a certain HARQ process, the base station apparatus 3 toggles the value of the NDI stored for the HARQ process and transmits the toggled NDI to the terminal apparatus 1. When the base station apparatus 3 transmits a transport block for retransmission in a certain HARQ process, the base station apparatus 3 does not toggle the value of the NDI stored for the HARQ process, and transmits the non-toggled NDI to the terminal apparatus 1. Terminal 1 is received if the value of the detected DCI format NDI field is not toggled (if it is the same) compared to the previously received NDI value for the transport block of a HARQ process. It is determined that the transport block is retransmitted. Here, toggling means switching to a different value.

The terminal device 1 converts HARQ-ACK information into a HARQ-ACK codebook in a slot indicated by the value of the HARQ instruction field included in the DCI format 1_0 corresponding to PDSCH reception or the DCI format 1-11. ) May be reported to the base station apparatus 3.

For DCI format 1_0, the value of the HARQ indicator field may be mapped to a set of slots (1,2,3,4,5,6,7,8). For DCI format 1-11, the value of the HARQ indicator field may be mapped to the set of slots given by the upper layer parameter dl-DataToUL-ACK. The number of slots indicated at least based on the value of the HARQ indicator field may also be referred to as HARQ-ACK timing or K1. For example, HARQ-ACK indicating the decoding state of the PDSCH (downlink data) transmitted in the slot n may be reported (transmitted) in the slot n + K1.

Dl-DataToUL-ACK shows a list of HARQ-ACK timings for PDSCH. Timing is the number of slots between the slot on which the PDSCH was received (or the slot containing the last OFDM symbol to which the PDSCH is mapped) and the slot on which the HARQ-ACK is transmitted for the received PDSCH. be. For example, dl-DataToUL-ACK is a list of 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 timings. If dl-DataToUL-ACK is a list of timings, the HARQ indicator field is 0 bits. If dl-DataToUL-ACK is a list of two timings, the HARQ indicator field is 1 bit. If the dl-DataToUL-ACK is a list of 3 or 4 timings, the HARQ indicator field is 2 bits. If the dl-DataToUL-ACK is a list of 5, 6, 6, 7, or 8 timings, the HARQ indicator field is 3 bits. For example, dl-DataToUL-ACK consists of a list of timings with any value in the range 0-31. For example, dl-DataToUL-ACK consists of a list of timings with any value in the range 0-63.

The size of dl-DataToUL-ACK is defined as the number of elements contained in dl-DataToUL-ACK. The size of dl-DataToUL-ACK may be referred to as L _para . The index of dl-DataToUL-ACK indicates the order (number) of the elements of dl-DataToUL-ACK. For example, if the size of dl-DataToUL-ACK is 8 (L _para = 8), the index of dl-DataToUL-ACK is any of 1, 2, 3, 4, 5, 6, 7, or 8. The value. The index of dl-DataToUL-ACK may be given, indicated, or indicated by the value indicated by the HARQ indicator field.

If the terminal device 1 is configured to monitor the PDCCH containing the DCI format 1_1 and is configured not to monitor the PDCCH containing the DCI format 1_1, the HARQ-ACK timing value K1 is (1, 2, 3, It may be a part or all of 4, 5, 6, 7, 8). If the terminal device 1 is configured to monitor PDCCH containing DCI format 1-11, the HARQ-ACK timing value K1 may be given by the upper layer parameter dl-DataToUL-ACK.

The counter DAI field indicates the cumulative number of PDSCHs or transport blocks scheduled to be received by the corresponding DCI format.

The counter DAI (Counter DAI) is the cumulative number (or cumulative number) of PDCCHs detected by the monitoring opportunity of the PDCCH in the serving cell for the monitoring opportunity of the PDCCH in the serving cell in the monitoring opportunity of M PDCCHs. It may be at least a value related to the number). The counter DAI may also be referred to as C-DAI. The C-DAI corresponding to the PDSCH may be indicated by a field contained in the DCI format used for scheduling the PDSCH.

As described above, one aspect of the present invention can appropriately execute the initial connection procedure between the terminal device 1 and the base station device 3. In the terminal device 1 that requires coverage expansion, the uplink channel is transmitted using a modulation method capable of covering coverage, and the information of the modulation method used in the terminal device 1 is implicitly used as a base station device by using a random access preamble. By notifying 3, the initial connection procedure can be appropriately executed. The base station device 3 can recognize the uplink channel modulation method used for each of the terminal device 1 that requires coverage expansion and the terminal device 1 that does not require coverage expansion by the detected random access preamble. The uplink channel can be demodulated and received by a modulation method suitable for the terminal device 1 of the above. As a result, efficient communication is achieved.

Hereinafter, aspects of various devices according to one aspect of the present embodiment will be described.

(1) In order to achieve the above object, the following means have been taken in the aspect of the present invention. That is, the first aspect of the present invention is a terminal device including a processor and a memory for storing a computer program code, the first random access preamble and the second random access preamble based on the reception quality in the random access procedure. To select one of the random access preambles of, to send the selected first random access preamble or the selected second random access preamble, to receive a random access response, using PUSCH. Includes sending an RRC connection request message containing an ID used to identify the terminal device, receiving a collision resolution message using the PDSCH, and sending HARQ-ACK to the PDSCH using the PUCCH. When the operation is performed and the first random access preamble is selected, the PUSCH is transmitted using the first modulation method, the PUCCH is transmitted using the first modulation method, and the second. When the random access preamble is selected, the PUSCH is transmitted using the second modulation method, and the PUCCH is transmitted using the second modulation method.

(2) Further, the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.

(3) A second aspect of the present invention is a base station apparatus including a processor and a memory for storing a computer program code, wherein in a random access procedure, a first random access preamble or a second random access. Detecting a transmission from the terminal device 1 in the preamble, sending a random access response, using the PUSCH to receive an RRC connection request message containing an ID used to identify the terminal device, using the PDSCH. When an operation including sending a collision resolution message and receiving HARQ-ACK for the PDSCH using the PUCCH is performed and the first random access preamble is detected, the first modulation method is used. When the PUSCH is received, the PUCCH is received using the first modulation method, and the second random access preamble is detected, the PUSCH is received using the second modulation method, and the second It is executed to receive the PUCCH by using the modulation method of.

(4) Further, the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.

(5) A third aspect of the present invention is a communication method used for a terminal device, in which one of a first random access preamble and a second random access preamble is selected based on reception quality in a random access procedure. Identification of the terminal device using a PUSCH, a step of selection, a step of transmitting the selected first random access preamble or the selected second random access preamble, a step of receiving a random access response, and a PUSCH. A step of transmitting an RRC connection request message including an ID used for the PDSCH, a step of receiving a collision resolution message using the PDSCH, and a step of transmitting HARQ-ACK for the PDSCH using the PUCCH. When the first random access preamble was selected, the PUSCH was transmitted using the first modulation method, the PUCCH was transmitted using the first modulation method, and the second random access preamble was selected. In this case, the PUSCH is transmitted using the second modulation method, and the PUCCH is transmitted using the second modulation method.

(6) Further, the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.

(7) A fourth aspect of the present invention is a communication method used for a base station device, in which transmission from a terminal device 1 is performed in a first random access preamble or a second random access preamble in a random access procedure. A step of detecting, a step of transmitting a random access response, a step of receiving an RRC connection request message including an ID used for identifying the terminal device using PUSCH, and a step of transmitting a collision resolution message using PDSCH. When the first random access preamble is detected, the first random access preamble includes the step of receiving HARQ-ACK for the PDSCH using the PUCCH, and the PUSCH is received using the first modulation method. When the PUCCH is received using one modulation method and the second random access preamble is detected, the PUSCH is received using the second modulation method, and the PUCCH is received using the second modulation method. To receive.

(8) Further, the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.

The program operating on the base station device 3 and the terminal device 1 according to one aspect of the present invention controls a CPU (Central Processing Unit) or the like so as to realize the functions of the above embodiment according to one aspect of the present invention. It may be a program (a program that makes a computer function). Then, the information handled by these devices is temporarily stored in RAM (RandomAccessMemory) at the time of processing, and then stored in various ROMs such as Flash ROM (ReadOnlyMemory) and HDD (HardDiskDrive). It is read, corrected and written by the CPU as needed.

Note that the terminal device 1 and a part of the base station device 3 in the above-described embodiment may be realized by a computer. In that case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed.

The "computer system" here is a computer system built in the terminal device 1 or the base station device 3, and includes hardware such as an OS and peripheral devices. Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, and a storage device such as a hard disk built in a computer system.

Further, a "computer-readable recording medium" is a medium that dynamically holds a program for a short time, such as a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In that case, a program may be held for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client. Further, the above-mentioned program may be for realizing a part of the above-mentioned functions, and may be further realized for realizing the above-mentioned functions in combination with a program already recorded in the computer system.

The terminal device 1 may consist of at least one processor and at least one memory including a computer program instruction (computer program). The memory and the computer program instruction (computer program) may be configured to use a processor to cause the terminal device 1 to perform the operations and processes described in the above embodiment. The base station device 3 may consist of at least one processor and at least one memory containing computer program instructions (computer programs). The memory and the computer program instruction (computer program) may be configured to use a processor to cause the base station apparatus 3 to perform the operations and processes described in the above embodiment.

Further, the base station device 3 in the above-described embodiment can also be realized as an aggregate (device group) composed of a plurality of devices. Each of the devices constituting the device group may include a part or all of each function or each function block of the base station device 3 according to the above-described embodiment. As the device group, it suffices to have each function or each function block of the base station device 3. Further, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as an aggregate.

Further, the base station apparatus 3 in the above-described embodiment may be EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or NG-RAN (NextGen RAN, NR RAN). Further, the base station apparatus 3 in the above-described embodiment may have a part or all of the functions of the upper node with respect to the eNodeB and / or the gNB.

Further, a part or all of the terminal device 1 and the base station device 3 in the above-described embodiment may be realized as an LSI, which is typically an integrated circuit, or may be realized as a chipset. Each functional block of the terminal device 1 and the base station device 3 may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of making an integrated circuit is not limited to the LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, when an integrated circuit technology that replaces an LSI appears due to advances in semiconductor technology, it is also possible to use an integrated circuit based on this technology.

Further, in the above-described embodiment, the terminal device is described as an example of the communication device, but the present invention is not limited to this, and the present invention is not limited to this, and is a stationary or non-movable electronic device installed indoors or outdoors. For example, it can be applied to terminal devices or communication devices such as AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other living equipment.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like within a range not deviating from the gist of the present invention are also included. Further, one aspect of the present invention can be variously modified within the scope of the claims, and the technical embodiment of the present invention can also be obtained by appropriately combining the technical means disclosed in the different embodiments. Included in the range. Further, the elements described in each of the above-described embodiments are included, and a configuration in which elements having the same effect are replaced with each other is also included.

One aspect of the present invention is used in, for example, a communication system, a communication device (for example, a mobile phone device, a base station device, a wireless LAN device, or a sensor device), an integrated circuit (for example, a communication chip), a program, or the like. be able to.

1 (1A, 1B, 1C) Terminal device 3 Base station device 10, 30 Wireless transmission / reception section 11, 31 Antenna section 12, 32 RF section 13, 33 Base band section 14, 34 Upper layer Processing section 15, 35 Medium access control layer Processing unit 16, 36 Radio resource control layer processing unit

Claims (5)

1. A terminal device including a processor and a memory for storing a computer program code.
   In the random access procedure, selecting either the first random access preamble or the second random access preamble based on the receive quality, the selected first random access preamble or the selected second random. Sending an access preamble, receiving a random access response, using PUSCH to send an RRC connection request message containing an ID used to identify the terminal device, and using PDSCH to receive a collision resolution message. That, performing an operation including transmitting HARQ-ACK for the PDSCH using PUCCH,
   When the first random access preamble is selected, the PUSCH is transmitted using the first modulation method, and the PUCCH is transmitted using the first modulation method.
   When the second random access preamble is selected, a terminal device that transmits the PUSCH using the second modulation method and transmits the PUCCH using the second modulation method.
2. The terminal device according to claim 1, wherein the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.
3. A base station device comprising a processor and a memory for storing computer program code.
   In a random access procedure, it is used to detect a transmission from a terminal device 1 in a first random access preamble or a second random access preamble, to send a random access response, and to identify the terminal device using PUSCH. An operation including receiving an RRC connection request message including an ID, sending a collision resolution message using PDSCH, and receiving HARQ-ACK for the PDSCH using PUCCH is executed.
   When the first random access preamble is detected, the PUSCH is received using the first modulation method, and the PUCCH is received using the first modulation method.
   A base station apparatus that receives the PUSCH using the second modulation method and receives the PUCCH using the second modulation method when the second random access preamble is detected.
4. The base station apparatus according to claim 3, wherein the first modulation method is π / 2BPSK, and the second modulation method is any one of BPSK, QPSK, and 16QAM.
5. It is a communication method used for terminal devices.
   In the random access procedure, a step of selecting either a first random access preamble or a second random access preamble based on reception quality, and the selected first random access preamble or the selected second. A step of transmitting a random access preamble, a step of receiving a random access response, a step of transmitting an RRC connection request message including an ID used to identify the terminal device using the PUSCH, and a collision resolution using the PDSCH. It includes a step of receiving a message and a step of transmitting HARQ-ACK for the PDSCH using PUCCH.
   When the first random access preamble is selected, the PUSCH is transmitted using the first modulation method, and the PUCCH is transmitted using the first modulation method.
   A communication method in which when the second random access preamble is selected, the PUSCH is transmitted using the second modulation method, and the PUCCH is transmitted using the second modulation method.

Images