Terminal device and communication method

Abstract

To enable a terminal device and a base station device to efficiently perform adaptation of a random access channel.SOLUTION: Information showing a configuration of a first random access channel is received, the information showing the configuration of the first random access channel includes at least information showing a first period for a random access channel opportunity, a signal showing that allocation of the first random access channel is started is received, a value of backoff is set, and a random access procedure using the first random access channel is performed in the random access channel opportunity after the value of the backoff from allocation start timing of the first random access channel.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a terminal device and a communication method. [Background technology]

[0002] Radio access method and radio network for cellular mobile communications (hereinafter referred to as "Long Term Evolution (LTE)" or "EUTRA: Evolved Universal Terrestrial Radio Access") LTE is being standardized by the 3rd Generation Partnership Project (3GPP). In LTE, base station equipment is also called eNodeB (evolved NodeB), and terminal equipment is also called UE (User Equipment). In a cellular communication system, a plurality of base station devices are arranged in the form of cells to cover an area covered by the base station. A single base station device may manage multiple serving cells.

[0003] 3GPP is currently studying and standardizing the next-generation standard (NR: New Radio) as a 5G communication method. NR combines eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency) in a single technology framework. It is required to satisfy the requirements assuming three scenarios:

[0004] 3GPP is studying methods to reduce energy consumption in networks in order to reduce the burden on the environment and reduce operation costs (Non-Patent Document 1). Most of the energy consumption in a network is caused by the radio access network. They are studying ways to reduce energy consumption by shortening the time that base station equipment transmits or receives signals and lengthening the time that base station equipment can enter a sleep state. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "New WID: Enhancements of network energy savings for NR", RP-234065, Ericsson, 3GPP TSG RAN Meeting #102, Edinburgh, Scotland, December 11th-15th, 2023 Summary of the Invention [Problem to be solved by the invention]

[0006] Adaptation of a signal common to terminal devices or transmission of a channel common to terminal devices is being considered. Adaptation of a physical random access channel (PRACH) in the time domain is being considered. By adaptively controlling the physical random access channel (PRACH) in the area, the base station equipment It is being considered to reduce energy consumption by shortening the time for PRACH detection. In this situation, one aspect of the present invention is to A terminal device capable of efficiently performing adaptation and a communication method used in the terminal device are provided. [Means for solving the problem]

[0007] (1) In order to achieve the above object, one aspect of the present invention provides the following means: That is, a first aspect of the present invention is a terminal device including a processor and a memory for storing computer program code, the terminal device receiving information indicating a configuration of a first random access channel, the information indicating the configuration of the first random access channel including at least information indicating a first period of a random access channel opportunity, receiving a signal indicating that allocation of the first random access channel will start, setting a backoff value, and A random access procedure using the first random access channel is performed at the random access channel opportunity after the backoff value.

[0008] (2) A second aspect of the present invention is a communication method used in a terminal device, comprising the steps of: receiving information indicating a configuration of a first random access channel; the information indicating the configuration of the first random access channel including at least information indicating a first period of a random access channel opportunity; receiving a signal indicating that allocation of the first random access channel will start; setting a backoff value; and performing a random access procedure using the first random access channel at the random access channel opportunity that is later than the backoff value from the start timing of allocation of the first random access channel. [Effects of the Invention]

[0009] According to the present invention, the terminal device and the base station device can efficiently adapt the random access channel. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a conceptual diagram of a wireless communication system according to an aspect of the present embodiment. [Figure 2]FIG. 2 is a schematic diagram illustrating an example of a resource grid in a subframe according to an aspect of the present embodiment. [Figure 3] 1 is a schematic block diagram showing a configuration of a terminal device 1 according to an aspect of the present embodiment. [Figure 4] FIG. 2 is a schematic block diagram illustrating a configuration of a base station device 3 according to one aspect of the present embodiment. [Figure 5] FIG. 10 is a diagram illustrating an example of an initial connection procedure according to an aspect of the present embodiment. [Figure 6] FIG. 10 is a diagram illustrating an example of adaptation of a random access channel according to one aspect of this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described.

[0012] "A and / or B" may be a term that includes "A", "B", or "A and B".

[0013] A parameter or information indicating one or more values ​​may mean that the parameter or information includes 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) including multiple parameters.

[0014] 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 will also be referred to as terminal devices 1 (UE). Hereinafter, the base station devices 3A to 3B will also be referred to as base station devices 3 (gNB).

[0015] The base station device 3 is a MCG (Master Cell Group) and an SCG (Secondary Cell Group). The MCG is a group of serving cells including at least a PCell (Primary Cell). The SCG is a group of serving cells including at least a PSCell (Primary Secondary Cell). The PCell may be a serving cell provided based on an initial connection. The MCG may be configured to include one or more SCells (Secondary Cells). The SCG may be configured to include one or more SCells. The serving cell identity is a serving cell identifier (SCI). The serving cell identifier may be provided by a higher layer parameter.

[0016] In a wireless communication system, the terminal device 1 and the base station device 3 may use one or more communication methods. For example, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) may be used in the downlink of the wireless communication system. Furthermore, either CP-OFDM or DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) may be used in the uplink of the wireless communication system. Here, DFT-s-OFDM is a communication method in which modified precoding is applied prior to signal generation in CP-OFDM. Here, modified precoding is also referred to as DFT precoding.

[0017] As shown in Figure 1, the base station device 3 may be configured with one transceiver device (or transmission point, transmission device, reception point, reception device, transmission / reception point). On the other hand, in some cases, the base station device 3 may be configured to include multiple transceivers devices. When the base station device 3 is configured with multiple transceivers devices, each of the multiple transceivers devices may be located in a different geographical location.

[0018] The subcarrier spacing (SCS: SubCarrier Spacing) Δf for a certain subcarrier spacing setting μ is Δf=2 μ For example, the subcarrier spacing setting μ may indicate any of 0, 1, 2, 3, and 4.

[0019] Time unit T c =1 / (Δf max ×N f ) may be used to represent the length in the time domain, where Δf max = 480 kHz. f = 4096. The constant κ may be expressed as κ = Δf max ×N f / (Δf ref N f,r ef )=64. Also, Δf ref may be 15 kHz. f,re f is 2048.

[0020] The transmission of downlink / uplink signals may be organized into radio frames (system frames, frames) of length Tf, where Tf=(Δfmax×Nf / 100)×Ts=10 ms.

[0021] A radio frame may be configured to include 10 subframes. Here, the length of a subframe may be Tsf = (Δfmax × Nf / 1000) × Ts = 1 ms. Even if the number of OFDM symbols per Nsubframe, μsymb=Nslotsymb×Nsubframe, μslot good.

[0022] An OFDM symbol is used as a time domain unit of a communication method used in a wireless communication system. For example, an OFDM symbol may be used as a time domain unit of CP-OFDM. , an OFDM symbol may be used as a time domain unit of DFT-s-OFDM.

[0023] A slot may be configured to include multiple OFDM symbols. For example, one slot may be configured by Nslotsymb consecutive OFDM symbols. For example, in the case of normal CP, In the setting, Nslotsymb=14 may be used. In the setting of the extended CP, Nslotsymb=12 may be used.

[0024] Slots may be indexed in the time domain. For example, the slot index nμs is an ascending integer value ranging from 0 to Nsubframe,μslot-1 in subframes. The slot index nμs,f may be given in order in a radio frame. It may be given in ascending order as integer values ​​ranging from 0 to Nframe, μslot-1.

[0025] Fig. 2 is a diagram showing an example of the configuration of a resource grid according to one aspect of this embodiment. In the resource grid of Fig. 2, the horizontal axis represents the OFDM symbol index lsym, and the vertical axis represents the subcarrier index ksc. The resource grid of Fig. 2 includes Nsize, μgrid, x × NRBsc subcarriers and Nsubframe, μsymb OFDM symbols. Here, Nsize, μgrid, and x represent the bandwidth of the SCS-specific carrier. The values ​​of Nsize, μgrid, and x are expressed in resource blocks.

[0026] Within the resource grid, the subcarrier index ksc and the OFDM symbol index The resource identified by the lsym is a ResourceElement (RE). It is also called.

[0027] A resource block (RB) contains NRBsc consecutive subcarriers. Resource blocks are divided into common resource blocks, physical resource blocks (PRBs), and virtual resource blocks (VRBs). For example, NRBsc=12.

[0028] A BandWidth Part (BWP) may be configured as a subset of the resource grid. Here, the BWP set for the downlink is also called a downlink BWP, and the BWP set for the uplink is also called an uplink BWP.

[0029] An example of the configuration of the terminal device 1 according to one aspect of this embodiment will be described below.

[0030] 3 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of the present embodiment. As shown in the figure, the terminal device 1 includes a radio transmission / reception unit 10 and an upper layer processing unit 14. The radio transmission / reception unit 10 includes an antenna unit 11, an RF (Radio Frequency) unit 12, and The radio transceiver 10 is configured to include at least a part or all of a baseband unit 13 and a medium access control layer processing unit 15 and a part or all of a radio resource control layer processing unit 16. The radio transceiver 10 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0031] The wireless transceiver 10 performs physical layer processing.

[0032] For example, the radio transceiver 10 may generate a baseband signal of an uplink physical channel. Here, a transport block delivered from a higher layer on the UL-SCH may be mapped to the uplink physical channel. For example, the radio transceiver 10 may generate a baseband signal of an uplink physical signal.

[0033] For example, the radio transceiver 10 may attempt to detect information transmitted by a downlink physical channel. Here, a transport block of the information transmitted by the downlink physical channel may be delivered to a higher layer on a DL-SCH. For example, the radio transceiver 10 may attempt to detect information transmitted by a downlink physical signal.

[0034] The receiving unit of the terminal device 1 receives the PDCCH. Processes receiving PDCCH in frequency band (cell, component carrier, carrier) The reception processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDCCH. The reception unit processing of the terminal device 1 performs processing to receive the PDCCH and to detect downlink control information (DCI format). It decodes the information and outputs the results to each unit.

[0035] The receiving unit of the terminal device 1 receives the PDSCH. Processes receiving PDSCH in frequency band (cell, component carrier, carrier) 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 receives the MAC CE via the PDSCH. The terminal device 1 receives the RRC signaling via the PDSCH and outputs the received RRC signaling to the upper layer processing unit 14.

[0036] The receiving unit of the terminal device 1 receives the random access response. The receiving unit of the terminal device 1 monitors the random access response within a random access response window. The receiving unit of the terminal device 1 monitors the contention resolution message within a contention resolution timer.

[0037] The receiver of the terminal device 1 receives the SSB and selects the SSB with the best reception conditions.

[0038] The transmission unit (also referred to as a transmission processing unit) of the terminal device 1 transmits a HARQ-ACK. The transmission processing unit of the terminal device 1 transmits a HARQ-ACK for a PDSCH. HARQ-ACK is transmitted in the link frequency band (cell, component carrier, carrier).

[0039] A transmission unit of the terminal device 1 transmits a random access preamble. A transmission unit of the terminal device 1 transmits the random access preamble using a preamble format. A transmission processing unit of the terminal device 1 transmits the random access preamble using a PRACH. The transmitting unit of the terminal device 1 transmits the RACH at the RACH occasion. The transmission unit of the terminal device 1 transmits the RACH at the RACH occasion set in the terminal device 1. A RACH occasion is selected from one or more RACH occasions corresponding to the SSB selected by the signal section. , and transmits a RACH (random access preamble) on the selected RACH occasion.

[0040] The transmission unit of the terminal device 1 retransmits the random access preamble. The transmission unit of the terminal device 1 retransmits the random access preamble on a plurality of RACH occasions. The transmitting unit of the terminal device 1 may retransmit the random access preamble up to a set maximum number (the maximum number of retransmissions of the random access preamble). The transmitting unit of the terminal device 1 may perform power ramping when retransmitting the random access preamble. The transmitting unit of the terminal device 1 may set the transmission power of the random access preamble based on the initial random access preamble power. The transmitting unit of the terminal device 1 may randomly select a random access preamble from multiple random access preambles set for contention-based random access.

[0041] The upper layer processing unit 14 outputs uplink data (transport block) generated by user operation or the like to the radio transmitting and receiving unit 10. The upper layer processing unit 14 processes data from the MAC layer, packet Packet Data Convergence Protocol (PDCP) layer, wireless link It processes the control (RLC: Radio Link Control) layer and the RRC layer.

[0042] A medium access control layer processing unit (MAC layer processing unit) 15 included in the upper layer processing unit 14 performs processing of the MAC layer.

[0043] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing for the RRC layer. The RRC layer processing unit 16 processes various setting information / parameters (RRC parameters) of the own device. The radio resource control layer processing unit 16 sets various setting information / parameters (RRC parameters) based on the signals of the higher layer received from the base station device 3. The RRC layer processing unit 16 sets various setting information / parameters (RRC parameters) based on information indicating the various setting information / parameters (RRC parameters) received from the base station device 3. The setting information includes information on physical channels and physical signals (i.e., the physical layer), MAC layer , PDCP layer, RLC layer, RRC layer processing or configuration related information. The parameters may be higher layer parameters.

[0044] For example, the radio resource control layer processing unit 16 may receive an RRC message on a certain logical channel. and set the acquired RRC parameters in a storage area of ​​the terminal device 1. The RRC parameters set in the storage area of ​​the terminal device 1 may be provided to a lower layer.

[0045] The radio resource control layer processing unit 16 performs the RRC signaling based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets a control resource set in the control resource set. The radio resource control layer processing unit 16 sets (configures) a search space in the control resource set. The radio resource control layer processing unit 16 sets (configures) PDCCH candidates to be monitored in the control resource set. The control unit 16 configures the number of PDCCH candidates to be monitored in the control resource set. The radio resource control processing unit 16 sets (configures) the aggregation level of the PDCCH candidates to be monitored within the control resource set. The radio resource control layer processing unit 16 sets the DCI format to be monitored.

[0046] The radio resource control layer processing unit 16 sets a RACH occasion based on the RRC parameters (RRC signaling) received from the base station device 3. The transmitting unit of the terminal device 1 transmits a RACH (second random access channel) on the set RACH occasion. The transmitting unit of the terminal device 1 transmits a random access preamble on the RACH. The radio resource control layer processing unit 16 sets a random access preamble on the basis of the RRC parameters received from the base station device 3. The maximum number of retransmissions may be set based on the RRC parameters received from the base station device 3. In this case, the maximum number of retransmissions of the random access preamble for the second random access channel may be set.

[0047] The radio resource control layer processing unit 16 performs the following processing based on the RRC parameters received from the base station device 3. The receiving unit of the terminal device 1 may receive a signal indicating that use of the set RACH occasion candidate will start. The transmitting unit of the terminal device 1 may receive a signal indicating that use of the set RACH occasion candidate will start. After that, the terminal device 1 may transmit a random access preamble (RACH) (first random access channel) on a RACH occasion corresponding to the set RACH occasion candidate. The transmitting unit of the terminal device 1 transmits the random access preamble on the RACH. The maximum number of retransmissions of the random access preamble may be set based on the RRC parameters received from the base station device 3. The first random access channel is selected based on the RRC parameters received from the base station device 3. It may also set a maximum number of retransmissions of the random access preamble for a channel.

[0048] The radio resource control layer processing unit 16 starts using the configured RACH occasion candidates. The interval from the start timing relating to the timing at which the receiver receives a signal indicating this to the timing at which the use of the configured RACH occasion candidates ends may be set based on RRC parameters (RRC signaling) received from the base station device 3.

[0049] The radio resource control layer processing unit 16 receives the first random access request through RRC signaling. The information indicating the configuration of the first random access channel may be received in accordance with the time interval (the time interval from the start of use of the configured RACH occasion candidate to the end of use) ( The information indicating the first period and the period of the candidate RACH occasions to be used (first period) are The information indicating the configuration of the first random access channel may include at least information indicating a maximum number of retransmissions of a random access preamble for the first random access channel. The information indicating the configuration of the first random access channel may include at least information indicating a value of a random access response window for the first random access channel. The information indicating the configuration of the first random access channel may include at least information indicating a value of power ramping for the first random access channel. The information indicating the configuration of the first random access channel may include at least information indicating a value of a contention resolution timer for the first random access channel. The information indicating the configuration of the first random access channel may include at least information indicating a total number of random access preambles for contention-based random access for the first random access channel. The information indicating the configuration of the first random access channel may include at least information indicating a value of an initial random access preamble power for the first random access channel. The information indicating the configuration of the first random access channel may include at least information indicating the number of random access channels to be frequency multiplexed in one time instance for the first random access channel.

[0050] The information indicating the configuration of the second random access channel is the period of the RACH occasion (second The information indicating the configuration of the second random access channel may include at least information indicating a random access response window value for the second random access channel. The information indicating the configuration of the second random access channel may include at least information indicating a power ramping value for the second random access channel. The information indicating the configuration of the second random access channel may include at least information indicating a contention resolution timer value for the second random access channel. The information indicating the configuration of the second random access channel may include at least information indicating a total number of random access preambles of contention-based random access for the second random access channel. The information indicating the configuration of the second random access channel may include at least information indicating an initial random access preamble power value for the second random access channel. The information indicating the configuration of the second random access channel may include at least information indicating the number of random access channels to be frequency-multiplexed in one time instance for the second random access channel.

[0051] The period is a period in which the RACH occasion for the first random access channel can be used. do.

[0052] The first period is shorter than the second period.

[0053] The first random access channel is a random access channel in which RACH occasions are dynamically controlled. That is, the first random access channel is used for RRC signaling (including system information) as well as DCI format or MAC This is a random access channel controlled by the CE. The channel determines whether the RACH occasion candidates to be assigned are actually assigned by RRC signaling (including system information). Whether it is DCI format or a random access channel controlled by the MAC CE The second random access channel is a quasi-static random access channel in which the RACH occasion is not dynamically controlled. In other words, the second random access channel is a random access channel in which the RACH occasion to be used is controlled only by RRC signaling (including system information). It is a random access channel.

[0054] The first random access channel is a random access channel that can be used by a terminal device 1 that complies with a new release (version) of the standard, but cannot be used by a terminal device 1 that complies only with an existing release (version) of the standard. The second random access channel is a random access channel that can be used by both a terminal device 1 that complies with a new release (version) of the standard and a terminal device 1 that complies only with an existing release (version) of the standard.

[0055] The first random access channel is a random access channel that can be used by a terminal device 1 that supports a network energy saving (NES) function. and is a random access channel that cannot be used by a terminal device 1 that does not support the network energy saving function. The second random access channel is a random access channel that can be used by both a terminal device 1 that supports the network energy saving function and a terminal device 1 that does not support the network energy saving function.

[0056] The first random access channel is a random access channel that is allocated (assigned) only within the interval, and the second random access channel is a random access channel that is allocated (assigned) regardless of the interval. In other words, the second random access channel is a random access channel that is allocated (assigned) even outside the interval.

[0057] If the random access procedure using the first random access channel is not completed up to the section, the transmitting unit of the terminal device 1 transmits the first random access channel to one or more RACH occasions corresponding to the second period. A random access procedure using the second random access channel may be performed in the

[0058] The random access procedure may be a contention-based random access procedure. The contention-based random access may be a procedure in which multiple random accesses are performed in a RACH occasion. The random access may be such that one random access preamble is randomly selected from the random access preambles and transmitted.

[0059] The signal indicating that allocation of the first random access channel is starting may be transmitted using a DCI format common to a plurality of terminal devices. The signal indicating that the channel allocation is starting may be transmitted using the MAC CE.

[0060] The start timing of the period may be one or more predetermined slots after the slot in which the signal indicating that allocation of the first random access channel will start is received.

[0061] A candidate slot for the start timing of the interval may be predefined (set), and the candidate slot that is later than and closest to the slot in which the signal indicating that allocation of the first random access channel will start is received may be determined as the start timing of the interval.A candidate slot for the start timing of the interval may be predefined (set), and the candidate slot that is later than and closest to the slot in which the signal indicating that allocation of the first random access channel will start is received by a predetermined number of slots or more may be determined as the start timing of the interval.

[0062] The radio resource control layer processing unit 16 performs the RRC signaling based on the RRC signaling received from the base station device 3. In this case, a plurality of configurations of the first random access channel are set, and a corresponding The information indicating the configuration of each first random access channel includes information indicating each of the intervals. The radio resource control layer processing unit 16 configures the plurality of first random access channels based on the RRC signaling received from the base station device 3. The information indicating the configuration of each first random access channel may include information indicating the maximum number of retransmissions of each random access preamble. The signal indicating that use of the configured RACH occasion candidates is to start may include information indicating which of the first Information indicating whether the random access channel configuration is applied may be included. That is, the signal indicating that the use of the configured RACH occasion candidates is started may include information indicating which of the configured RACH occasion candidates is applied. In other words, the use of the configured RACH occasion candidates may be included. The signal indicating that the random access preamble starts may include information indicating which maximum number of retransmissions of the random access preamble is applied. The signal indicating that the use of the random access response window will start may include information indicating which value of the random access response window is applied. The signal indicating that the use of the RACH occasion candidate will start may include information indicating which contention resolution timer value is applied. The signal indicating that the use of the complementary RACH occasion candidates is to be started may include information indicating which power ramping value is to be applied. The signal indicating that the use of the configured RACH occasion candidates is to start may include information indicating which of the total numbers of random access preambles used for the contention-based random access is to be applied. Information indicating whether the number of random access channels frequency-multiplexed in the instance is applied may be included. In other words, the information indicating whether the use of the configured RACH occasion candidates is started may be included. The indicating signal may include information indicating which initial random access preamble power value applies.

[0063] Each of the plurality of first random access channel configurations may include information indicating a random access response window. Each of the plurality of first random access channel configurations may include information indicating a contention resolution timer. Each of the plurality of first random access channel configurations may include information indicating power ramping. Each of the plurality of first random access channel configurations may include information indicating a total number of random access preambles used for contention-based random access. Each of the plurality of first random access channel configurations may include information indicating the number of random access channels frequency-multiplexed in one time instance. Each of the plurality of first random access channel configurations may include information indicating an initial random access preamble power.

[0064] The radio resource control layer processing unit 16 processes the RRC signaling (system The RACH preamble format (PRACH preamble format) used in the uplink slot is set based on the RACH preamble format (PRACH preamble format). Either a short preamble format or a long preamble format is set as the RACH preamble format (PRACH preamble format).

[0065] The long preamble format is a RACH preamble format (PRACH preamble format) with a signal configuration of multiple slots. The short preamble format is a RACH preamble format with a signal configuration of a single slot. preamble format (PRACH preamble format). For example, the Long preamble format is In NR, the Long preamble format is a RACH preamble format (PRACH preamble format) with a RACH preamble sequence length of 839 and a time length of 3 slots (3 ms) or 4 slots (4 ms). In NR, the Long preamble format is a RACH preamble format of Format 1 or Format 2. For example, the Short preamble format is a RACH preamble format with a RACH preamble sequence length of 839 and a time length of 1 slot (1 ms). In NR, the short preamble format is Format 0, Format 3 is.

[0066] The medium access control layer processing unit (MAC layer processing unit) 15 performs HARQ operation, MAC CE resolution, and It performs MAC layer processing such as processing based on the reading and decoding results.

[0067] The radio resource control layer processing unit 16 may include function information generated based on the functions of the terminal device 1 in an RRC message and transmit the RRC message to the base station device 3.

[0068] The wireless transmission / reception unit 10 performs modulation, coding, and transmission processing. The wireless transmission / reception unit 10 generates a physical signal by coding processing, modulation processing, and baseband signal generation processing (conversion to a time-continuous signal) on data (transport blocks), and transmits the generated physical signal to the base station device 3 or the terminal device 1.

[0069] The radio transmission / reception unit 10 performs demodulation processing, decoding processing, and reception processing. The radio transmission / reception unit 10 outputs a transport block from the information detected based on the demodulation processing and decoding processing of the received physical signal to the upper layer processing unit 14 on the DL-SCH.

[0070] The RF unit 12 converts (down-converts) the signal received via the antenna unit 11 into a baseband signal and removes unnecessary frequency components. The RF unit 12 outputs the baseband signal to the baseband unit 13.

[0071] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 extracts a CP (Cyclic Prefix) from the converted digital signal. The baseband unit 13 performs a fast Fourier transform (FFT) on the signal from which the CP has been removed, and extracts a signal in the frequency domain.

[0072] The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the physical signal to generate an OFDM symbol. The baseband unit 13 adds a CP to the symbol to generate a baseband digital signal. The baseband unit 13 converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[0073] The RF unit 12 uses a low-pass filter to remove unnecessary frequency components from the analog signal input from the baseband unit 13, and up-converts the analog signal to a carrier frequency. The RF unit 12 converts the RF signal to generate an RF signal. The RF unit 12 transmits the RF signal via the antenna unit 11. The RF unit 12 also amplifies the power. The RF unit 12 may also have a function to control the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0074] An example of the configuration of the base station device 3 according to one aspect of this embodiment will be described below.

[0075] 4 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. As shown in the figure, the base station device 3 includes a radio transmission / reception unit 30 and a higher layer processing unit 34. The radio transmission / reception unit 30 includes an antenna unit 31, an RF (Radio Frequency) unit 32, and a baseband unit 33. The higher layer processing unit 34 , a medium access control layer processing unit 35, and a radio resource control layer processing unit 36. The radio transceiver unit 30 is also referred to as a transmitter, a receiver, or a physical layer processing unit.

[0076] The upper layer processing unit 34 performs processing on a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Radio Resource Control (RRC) layer. In this example, the MAC layer is also called the MAC sublayer, the PDCP layer is also called the PDCP sublayer, the RLC layer is also called the RLC sublayer, and the RRC layer is also called the RRC sublayer.

[0077] The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs MAC layer processing. Here, the MAC layer processing involves mapping between logical channels and transport channels, Or multiplexing multiple MAC SDUs (Service Data Units) into a transport block, or decomposing a transport block delivered from the physical layer on UL-SCH into one or multiple MAC SDUs. ,Application of HARQ (Hybrid Automatic Repeat reQuest) to transport blocks, and may include some or all of the processing of scheduling requests.

[0078] The radio resource control layer processing unit 36 ​​included in the upper layer processing unit 34 performs RRC layer processing. The RRC layer processing may include some or all of broadcast signal management, RRC connection / RRC idle state management, and RRC reconfiguration. The radio resource control layer processing unit 36 ​​generates downlink data (transport blocks) to be allocated to the PDSCH, system information, RRC messages, MAC CE, etc., or acquires them from upper nodes, and outputs them to the radio transceiver unit 30.

[0079] The radio resource control layer processing unit 36 ​​also manages various setting information / parameters (RRC parameters) of each terminal device 1. The radio resource control layer processing unit 36 ​​receives information via signals in higher layers. In other words, the radio resource control layer processing unit 36 ​​transmits / broadcasts information indicating the various setting information / parameters. The setting information may be information regarding a physical channel or a physical signal (i.e., a physical layer), a MAC layer, a PDCP layer, etc. The parameters may include information related to processing or configuration of the RLC layer, RRC layer, or RRC layer. The parameters may be higher layer parameters. For example, the radio resource control layer processing unit 36 ​​may include the RRC parameters in an RRC message on a certain logical channel and transmit the RRC parameters to the terminal device 1. Here, the RRC message may be mapped to any one of a BCCH (Broadcast Control CHannel), a CCCH (Common Control CHannel), and a DCCH (Dedicated Control CHannel).

[0080] The radio resource control layer processing unit 36 ​​receives the RRC message transmitted from the terminal device 1. The RRC parameters to be transmitted to the terminal device 1 may be determined based on the RRC parameters. Here, the RRC message transmitted from the terminal device 1 is related to the capability information report of the terminal device 1. That's fine.

[0081] The radio resource control layer processing unit 36 ​​sets a control resource set for the terminal device 1. A plurality of PDCCH candidates are configured (set) within the set control resource set. The radio resource control layer processing unit 36 ​​sets a search space for the terminal device 1. The radio resource control layer processing unit 36 ​​sets a DCI format to be monitored in the search space for the terminal device 1. Determine.

[0082] The radio resource control layer processing unit 36 ​​sets a DCI format to be applied to the terminal device 1 within the control resource set. The radio resource control layer processing unit 36 ​​generates RRC signaling indicating the DCI format to be applied in the transmission processing unit.

[0083] The radio resource control layer processing unit 36 ​​performs settings related to a plurality of search spaces, each of which is indexed.

[0084] The radio resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK to the terminal device 1. The radio resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier). The uplink resource control layer processing unit 36 ​​allocates resources for transmitting HARQ-ACK for PDSCH to the uplink. link frequency band (cell, component carrier, carrier).

[0085] The radio resource control layer processing unit 36 ​​sets the RACH occasion. The radio resource control layer processing unit 36 ​​sets a RACH occasion (candidates for the RACH occasion) for the first random access channel. The radio resource control layer processing unit 36 ​​sets a RACH occasion for the second random access channel. The radio resource control layer processing unit 36 ​​sets a period of the RACH occasion. The radio resource control layer processing unit 36 ​​sets a period of the RACH occasion (candidates for the RACH occasion) for the first random access channel. The radio resource control layer processing unit 36 ​​sets a period of the RACH occasion for the second random access channel. .

[0086] The radio resource control layer processing unit 36 ​​sets an interval for the first random access channel. The length of the interval may be predefined. The radio resource control layer processing unit 36 ​​may set a maximum number of retransmissions of a random access preamble for the first random access channel. The radio resource control layer processing unit 36 ​​may set a maximum number of retransmissions of a random access preamble for the second random access channel. The radio resource control layer processing unit 36 ​​may set a value of a random access response window for the first random access channel. The radio resource control layer processing unit 36 ​​may set a value of a random access response window for the second random access channel. The radio resource control layer processing unit 36 ​​may set a value of a contention resolution timer for the first random access channel. The radio resource control layer processing unit 36 ​​may set a value of a contention resolution timer for the second random access channel. The radio resource control layer processing unit 36 ​​may set a value of power ramping for the first random access channel. The radio resource control layer processing unit 36 ​​may set a value of power ramping for the second random access channel. The radio resource control layer processing unit 36 ​​may set an initial random access preamble power value for the first random access channel. The radio resource control layer processing unit 36 ​​may set an initial random access preamble power value for the second random access channel. The radio resource control layer processing unit 36 ​​may set a total number of random access preambles for contention-based random access for the first random access channel. The radio resource control layer processing unit 36 ​​may set a total number of random access preambles for contention-based random access for the second random access channel. The radio resource control layer processing unit 36 ​​may set the number of random access channels to be frequency-multiplexed in one time instance for the first random access channel.The radio resource control layer processing unit 36 ​​may set the number of random access channels to be frequency-multiplexed in one time instance for the second random access channel. The radio resource control layer processing unit 36 ​​may set a RACH preamble format.

[0087] The medium access control layer processing unit (MAC layer processing unit) 35 performs HARQ operation, MAC CE generation, and It performs MAC layer processing such as configuration.

[0088] The functions of the radio transceiver 30 are similar to those of the radio transceiver 10, and therefore a description thereof will be omitted where appropriate. The radio transceiver 30 performs physical layer processing. Here, the physical layer processing may include some or all of the following: generation of a baseband signal of a physical channel; generation of a baseband signal of a physical signal; detection of information transmitted by the physical channel; and detection of information transmitted by the physical signal. The physical layer processing may also include mapping of a transport channel to a physical channel. Here, the baseband signal is also referred to as a time-continuous signal.

[0089] The radio transceiver 30 may perform one or both of demodulation and decoding. The radio transceiver 30 may deliver a transport block of information detected based on the demodulation and decoding of a received physical signal to a higher layer on the UL-SCH. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical channel. Here, the transport block delivered from a higher layer on the DL-SCH may be allocated to the downlink physical channel. For example, the radio transceiver 30 may generate a baseband signal of a downlink physical signal.

[0090] The radio transceiver 30 may perform some or all of modulation processing, coding processing, and transmission processing. The radio transceiver 30 may generate a physical signal based on some or all of coding processing, modulation processing, and baseband signal generation processing for a transport block. The radio transceiver 30 may map the physical signal to a certain BWP. The radio transceiver 30 , and may transmit the generated physical signal. For example, the radio transceiver 30 may attempt to detect information transmitted by an uplink physical channel. Here, a transport block of the information transmitted by the uplink physical channel may be delivered to a higher layer on an UL-SCH. For example, the radio transceiver 30 may attempt to detect information transmitted by an uplink physical signal.

[0091] The radio transmission / reception unit 30 grasps the SS (Search space) configured in the terminal device 1. The radio transmission / reception unit 30 grasps the search space in the control resource set configured in the terminal device 1. The radio transmission / reception unit 30 grasps PDCCH candidates monitored in the terminal device 1, The radio transmission / reception unit 30 grasps the search area for each PDCCH candidate monitored in the terminal device 1. It is determined which control channel elements the PDCCH candidate is made up of (the PDCCH candidate is made up of The radio transceiver 30 includes an SS determining unit, which determines the SS configured in the terminal device 1. The SS determining unit determines one or more PDCCH candidates in the control resource set configured as the search space of the terminal device. SS determining unit grasps the PDCCH candidates (the number of PDCCH candidates, the numbers of the PDCCH candidates) configured in the search area of ​​the control resource set of the terminal device 1.

[0092] The SS ascertaining unit ascertains the configuration of the search space within the control resource set (the number of PDCCH candidates, the OFDM symbols of the PDCCH candidates, and the aggregation level of the PDCCH candidates). The transmitting unit (transmission processing unit) of the radio transmitting / receiving unit 30 notifies the terminal device 1 of the PDCCH candidates within the search space of the control resource set. The PDCCH is transmitted using the

[0093] The transmitter (also referred to as a transmission processor) of the base station device 3 transmits the PDCCH. The transmission processing unit of the base station device 3 transmits the PDCCH using PDCCH candidates monitored in the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search area set for the terminal device 1. The transmission processing unit of the base station device 3 transmits the PDCCH using resources corresponding to PDCCH candidates in a search area set for the terminal device 1. The PDCCH is transmitted using the PDCCH candidates in the search area where the matching is performed.

[0094] The receiving unit (also referred to as a receiving processing unit) of the base station device 3 receives the HARQ-ACK. The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH. The receiving processing unit of the base station device 3 The reception processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3. do.

[0095] The receiving unit of the base station device 3 receives the RACH. The spramble detection process is performed.

[0096] The radio resource control layer processing unit 36 ​​sets a RACH occasion and transmits RRC parameters related to the set RACH occasion to the terminal device 1. The receiving unit of the base station device 3 receives a RACH (second random access channel) on the set RACH occasion. The receiving unit of the base station device 3 receives a random access preamble on the RACH. The radio resource control layer processing unit 36 ​​sets a maximum number of retransmissions of the random access preamble and transmits RRC parameters related to the set maximum number of retransmissions of the random access preamble to the terminal device 1. The radio resource control layer processing unit 36 ​​may set a maximum number of retransmissions of a random access preamble for the second random access channel, and may transmit an RRC parameter related to the set maximum number of retransmissions of the random access preamble to the terminal device 1. The wired resource control layer processing unit 36 ​​sets a value of the random access response window, and transmits RRC parameters related to the set value of the random access response window to the terminal device. The radio resource control layer processing unit 36 ​​may set a value of a random access response window for the second random access channel, and may transmit an RRC parameter related to the set value of the random access response window to the terminal device 1. The radio resource control layer processing unit 36 ​​sets the value of the contention resolution timer and transmits the RRC parameters related to the set contention resolution timer value to the terminal. The radio resource control layer processing unit 36 ​​sets a value of a contention resolution timer for the second random access channel and transmits RRC parameters related to the set contention resolution timer value to the terminal device 1. The radio resource control layer processing unit 36 ​​may set a power ramping value and transmit RRC parameters related to the set power ramping value to the terminal device 1. The source control layer processing unit 36 ​​sets a power ramping value for the second random access channel and transmits RRC parameters related to the set power ramping value to the terminal device 1. The radio resource control layer processing unit 36 ​​may set an initial random access preamble power value and transmit an RRC parameter related to the set initial random access preamble power value. The radio resource control layer processing unit 36 ​​may set an initial random access preamble power value for the second random access channel and transmit RRC parameters related to the set initial random access preamble power value to the terminal device 1. The radio resource control layer processing unit 36 ​​may set the total number of random access preambles for contention-based random access and transmit the RRC parameter related to the set total number of random access preambles for contention-based random access to the radio resource control layer processing unit 36. The radio resource control layer processing unit 36 ​​may set the total number of random access preambles for contention-based random access for the second random access channel, and may transmit RRC parameters related to the set total number of random access preambles for contention-based random access to the terminal device 1. The radio resource control layer processing unit 36 ​​may set the number of random access channels to be frequency-multiplexed in one time instance and transmit an RRC parameter related to the set number of random access channels to be frequency-multiplexed in one time instance to the terminal device 1. The radio resource control layer processing unit 36 ​​may set the number of random access channels to be frequency-multiplexed in one time instance for the second random access channel, and may transmit to the terminal device 1 an RRC parameter related to the set number of random access channels to be frequency-multiplexed in one time instance.

[0097] The radio resource control layer processing unit 36 ​​sets RACH occasion candidates and transmits RRC parameters related to the set RACH occasion candidates to the terminal device 1. The base station device 3 transmits a signal indicating that the use of the selected RACH occasion candidate will start. The transmitter of the After transmitting, the RACH (random) is sent on the RACH occasion corresponding to the configured RACH occasion candidate. The base station device 3 receives the random access preamble (RACH) via the RACH. The radio resource control layer processing unit 36 ​​sets a maximum number of retransmissions of the random access preamble, and transmits an RRC parameter related to the set maximum number of retransmissions of the random access preamble to the terminal device 1. The radio resource control layer processing unit 36 ​​may set a maximum number of retransmissions of a random access preamble for the first random access channel, and may transmit to the terminal device 1 an RRC parameter related to the set maximum number of retransmissions of the random access preamble. The radio resource control layer processing unit 36 ​​sets a value of the random access response window and transmits RRC parameters related to the set value of the random access response window to the terminal device. The radio resource control layer processing unit 36 ​​may set a value of a random access response window for the first random access channel and transmit an RRC parameter related to the set value of the random access response window to the terminal device 1. The radio resource control layer processing unit 36 ​​sets the value of the contention resolution timer and sets the RRC parameters related to the set contention resolution timer value. The radio resource control layer processing unit 36 ​​may set a value of a contention resolution timer for the first random access channel and transmit RRC parameters related to the set contention resolution timer value to the terminal device 1. The radio resource control layer processing unit 36 ​​may set a power ramping value and transmit RRC parameters relating to the set power ramping value to the terminal device 1. The source control layer processing unit 36 ​​sets a power ramping value for the first random access channel and transmits RRC parameters related to the set power ramping value to the terminal device 1. The radio resource control layer processing unit 36 ​​may set an initial random access preamble power value and transmit an RRC signal related to the set initial random access preamble power value. The radio resource control layer processing unit 36 ​​may set an initial random access preamble power value for the first random access channel, and transmit the RRC parameters related to the set initial random access preamble power value to the terminal device 1. The radio resource control layer processing unit 36 ​​may set the total number of random access preambles for contention-based random access and transmit the RRC parameter related to the set total number of random access preambles for contention-based random access to the device 1. The radio resource control layer processing unit 36 ​​may set the total number of random access preambles for contention-based random access for the first random access channel, and may transmit RRC parameters related to the set total number of random access preambles for contention-based random access to the terminal device 1. The radio resource control layer processing unit 36 ​​may set the number of random access channels to be frequency-multiplexed in one time instance, and transmit to the terminal device 1 an RRC parameter relating to the set number of random access channels to be frequency-multiplexed in one time instance. The radio resource control layer processing unit 36 ​​may set the number of random access channels to be frequency-multiplexed in one time instance for the first random access channel, and may transmit to the terminal device 1 an RRC parameter related to the set number of random access channels to be frequency-multiplexed in one time instance.

[0098] The radio resource control layer processing unit 36 ​​starts using the configured RACH occasion candidates. The section is set from the start timing of the timing when the transmitter transmits a signal indicating that the set RACH occasion candidate is to be used until the end timing of the set RACH occasion candidate, and indicates the set section. The RRC parameters may be transmitted to the terminal device 1.

[0099] The radio resource control layer processing unit 36 ​​receives the first random access request through RRC signaling. The information indicating the configuration of the first random access channel may be transmitted. The information indicating the configuration of the first random access channel may be transmitted in a time period (a time period from the start of use of the configured RACH occasion candidates to the end of use). and the period (first period) of the candidate RACH occasions to be used. The information indicating the configuration of the first random access channel may include at least information indicating the maximum number of retransmissions of a random access preamble for the first random access channel. The information indicating the configuration of the second random access channel may include at least information indicating a period (second period) of RACH occasions. The information indicating the configuration of the random access channel may include at least information indicating the maximum number of retransmissions of a random access preamble for the second random access channel.

[0100] The period is a period in which the RACH occasion for the first random access channel can be used. do.

[0101] The first period is shorter than the second period.

[0102] The first random access channel is a random access channel in which RACH occasions are dynamically controlled. That is, the first random access channel is a RACH occasion that is controlled not only by RRC signaling but also by DCI format or MAC CE. The second random access channel is a random access channel in which the RACH occasion is not dynamically controlled but is semi-statically controlled. The second random access channel is a random access channel in which the RACH occasions to be used are controlled solely by RRC signaling (including system information).

[0103] The first random access channel is a random access channel that can be used by a terminal device 1 that complies with a new release (version) of the standard, but cannot be used by a terminal device 1 that complies only with an existing release (version) of the standard. The second random access channel is a random access channel that can be used by both a terminal device 1 that complies with a new release (version) of the standard and a terminal device 1 that complies only with an existing release (version) of the standard.

[0104] The first random access channel is a random access channel that can be used by a terminal device 1 that supports a network energy saving (NES) function. and is a random access channel that cannot be used by a terminal device 1 that does not support the network energy saving function. The second random access channel is a random access channel that can be used by both a terminal device 1 that supports the network energy saving function and a terminal device 1 that does not support the network energy saving function.

[0105] The first random access channel is a random access channel that is allocated only within the interval, and the second random access channel is a random access channel that is allocated regardless of the interval, i.e., the second random access channel is a random access channel that is allocated even outside the interval.

[0106] The random access procedure performed on the first random access channel may be a contention-based random access procedure. The contention-based random access involves randomly selecting one random access preamble from a plurality of random access preambles in a RACH occasion. The random access may be such that one random access preamble is selected and transmitted.

[0107] The signal indicating that allocation of the first random access channel is starting may be transmitted using a DCI format common to a plurality of terminal devices. The signal indicating that the channel allocation is starting may be transmitted using the MAC CE.

[0108] The start timing of the period may be one or more predetermined slots after the slot in which the signal indicating that allocation of the first random access channel will start is transmitted.

[0109] A candidate slot for the start timing of the interval may be predefined (set), and the candidate slot that is later than and closest in time to the slot in which a signal indicating that allocation of the first random access channel will start is transmitted may be determined as the start timing of the interval.A candidate slot for the start timing of the interval may be predefined (set), and the candidate slot that is later than and closest in time to the slot in which a signal indicating that allocation of the first random access channel will start is transmitted by one or more predetermined slots may be determined as the start timing of the interval.

[0110] The radio resource control layer processing unit 36 ​​may set a configuration of a plurality of first random access channels, set the period independently for each configuration, and transmit information indicating the configuration of the plurality of first random access channels to the terminal device 1 using RRC signaling. The source control layer processing unit 36 ​​sets a configuration of a plurality of first random access channels, sets a maximum number of retransmissions of the random access preamble independently for each configuration, and transmits information indicating the configuration of the plurality of first random access channels to the terminal device using RRC signaling. The radio resource control layer processing unit 36 ​​may set the configuration of a plurality of first random access channels, set the value of the random access response window for each configuration independently, and transmit information indicating the configuration of the plurality of first random access channels to the RRC system. The radio resource control layer processing unit 36 ​​may set the configurations of a plurality of first random access channels, set the value of the contention resolution timer independently for each configuration, and transmit information indicating the configurations of the plurality of first random access channels to the terminal device 1 using RRC signaling. The radio resource control layer processing unit 36 ​​sets the configuration of a plurality of first random access channels, sets a power ramping value independently for each configuration, and transmits information indicating the configuration of the plurality of first random access channels to the terminal device 1 using RRC signaling. The radio resource control layer processing unit 36 ​​sets the configuration of the plurality of first random access channels, sets the value of the initial random access preamble power for each configuration independently, and transmits information indicating the configuration of the plurality of first random access channels using RRC signaling. The radio resource control layer processing unit 36 ​​sets the configuration of a plurality of first random access channels, sets the number of random access channels to be frequency-multiplexed in one time instance independently for each configuration, and transmits information indicating the configuration of the plurality of first random access channels to the terminal device 1 using RRC signaling. That's fine.

[0111] The RF unit 32 may convert the signal received via the antenna unit 31 into a baseband signal and remove unnecessary frequency components. The RF unit 32 outputs the baseband signal to the baseband unit 33.

[0112] The baseband unit 33 may digitize the baseband signal input from the RF unit 32. The baseband unit 33 may remove a portion corresponding to a CP (Cyclic Prefix) from the digitized baseband signal. Alternatively, a fast Fourier transform (FFT) may be performed on the subband signal to extract a frequency domain signal.

[0113] The baseband unit 33 may generate a baseband signal by performing an inverse fast Fourier transform (IFFT) on the physical signal. The baseband unit 33 may add a CP to the generated baseband signal. The baseband unit 33 may convert the baseband signal to which the CP has been added into an analog signal. The baseband unit 33 may output the analog baseband signal to the RF unit 32.

[0114] The RF unit 32 may remove unnecessary frequency components from the baseband signal input from the baseband unit 33. The RF unit 32 may up-convert the baseband signal to a carrier frequency to generate an RF signal. The RF unit 32 may transmit the RF signal via the antenna unit 31. The RF unit 32 may also have a function of controlling transmission power.

[0115] Each of the units designated by reference numerals 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the units designated by reference numerals 30 to 36 in the base station device 3 may be configured as a circuit.

[0116] Hereinafter, physical channels and physical signals according to various aspects of the present embodiment will be described. Physical signals are a general term for downlink physical channels, downlink physical signals, uplink physical channels, and uplink physical channels. Physical channels are a general term for downlink physical channels and uplink physical channels. Physical signals are a general term for downlink physical signals and uplink physical signals.

[0117] An uplink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. An uplink physical channel is a physical channel used in an uplink component carrier. An uplink physical channel may be transmitted by the radio transceiver unit 10. An uplink physical channel may be received by the radio transceiver unit 30. In a wireless communication system according to one aspect of the present embodiment, at least some 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)

[0118] The PUCCH transmits (transmits) uplink control information (UCI). The uplink control information may be placed in the PUCCH. The wireless transmission and reception unit 10 may transmit a PUCCH in which uplink control information is arranged. The receiving unit 30 may receive a PUCCH in which uplink control information is arranged.

[0119] Uplink control information (uplink control information bit, uplink control information sequence, uplink control information type) is used in combination with channel state information (CSI), schedule Scheduling Request (SR), HARQ-ACK (Hybrid Automatic Repeat The uplink control information may include some or all of the request ACKnowledgement (ACK) information. Note that the uplink control information may also include information not described above.

[0120] The channel state information is also referred to as a channel state information bit or a channel state information sequence. The scheduling request is also referred to as a scheduling request bit or a scheduling request sequence. The HARQ-ACK information is also referred to as a HARQ-ACK information bit or a HARQ-ACK information sequence.

[0121] The HARQ-ACK information may be configured by HARQ-ACK bits corresponding to one transport block (TB). The HARQ-ACK bits may indicate an acknowledgement (ACK) or a negative acknowledgement (NACK) corresponding to the transport block. An ACK may indicate that the transport block has been decoded successfully. A NACK may indicate that the transport block has not been decoded successfully. The HARQ-ACK information may include one or more HARQ-ACK bits.

[0122] HARQ-ACK for transport blocks is also called HARQ-ACK for PDSCH. Here, "HARQ-ACK for PDSCH" may refer to HARQ-ACK for a transport block included in the PDSCH.

[0123] A scheduling request may be used to request UL-SCH resources for an initial transmission. The scheduling request bit can be a positive SR or may be used to indicate either a negative SR. When the scheduling request bit indicates a positive SR, this is also referred to as "a positive SR is transmitted (communicated)." A positive SR may indicate that the terminal device 1 requests UL-SCH resources for the initial transmission. When the scheduling request bit indicates a negative SR, this is also referred to as "a negative SR is transmitted (communicated)." A negative SR may indicate that the terminal device 1 does not request UL-SCH resources for the initial transmission.

[0124] The channel state information is a channel quality indicator (CQI), a pre-conditioning The CQI may include some or all of a Precoder Matrix Indicator (PMI) and a Rank Indicator (RI). Alternatively, it is an index related to the quality of the physical channel, and PMI is an index related to the precoder. The RI is an index related to the transmission rank (or the number of transmission layers).

[0125] The channel state information is an indicator related to the reception state of a physical signal (e.g., CSI-RS) used for channel measurement. The value of the channel state information may be determined by the terminal device 1 based on the reception state assumed by the physical signal used for channel measurement. The channel measurement may include interference measurement.

[0126] The PUCCH may have a PUCCH format, where the PUCCH format may be a format of physical layer processing of the PUCCH, or a format of information transmitted using the PUCCH.

[0127] The PUSCH carries uplink control information and / or transport blocks. The PUSCH may be transmitted to convey uplink control information and transport information. The PUSCH may be used to carry one or both of the transport blocks. The PUSCH may be used to transmit at least some or all of the port blocks, HARQ-ACKs, channel state information, and scheduling requests. The PUSCH is used at least to transmit access message 3. The terminal device 1 may transmit uplink control information and / or a PUSCH in which a transport block is allocated. The station device 3 may receive a PUSCH in which either or both of the uplink control information and the transport block are arranged.

[0128] PRACH is the index of the random access preamble (random access message The terminal device 1 may transmit the PRACH. The base station device 3 may receive the PRACH. The terminal device 1 may transmit a random access preamble on the PRACH. The base station device 3 may transmit a random access preamble on the PRACH. may be received.

[0129] The PRACH transmits the random access preamble (random access message 1). The PRACH is used at least for initial connection establishment. establishment procedure, handover procedure, connection re-establishment procedure, synchronization (timing adjustment) for PUSCH transmission and at least used to indicate some or all of the request for resources for the PUSCH. This may also be done.

[0130] The uplink physical signal may correspond to a set of resource elements. The uplink physical signal does not have to be used to transmit information generated in a higher layer. The uplink physical signal may be used to transmit information generated in a physical layer. The uplink physical signal may be a physical signal used in an uplink component carrier. The radio transceiver unit 10 may transmit the uplink physical signal. The radio transceiver unit 30 may receive the uplink physical signal. In the uplink of the wireless communication system according to one aspect of the present embodiment, some or all of the following uplink physical signals may be used. ·UL DMRS(UpLink Demodulation Reference Signal) ·SRS(Sounding Reference Signal) ·UL PTRS(UpLink Phase Tracking Reference Signal)

[0131] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0132] The set of antenna ports for DMRS for PUSCH (DMRS related to PUSCH, DMRS included in PUSCH, DMRS corresponding to PUSCH) is given based on the set of antenna ports for the PUSCH. For example, for PUSCH The set of antenna ports for the DMRS is the same as the set of antenna ports for the PUSCH. Good too.

[0133] The propagation path of the PUSCH may be estimated from the DMRS for the PUSCH.

[0134] The set of antenna ports for DMRS for PUCCH (DMRS related to PUCCH, DMRS included in PUCCH, DMRS corresponding to PUCCH) may be the same as the set of antenna ports for PUCCH. stomach.

[0135] The propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0136] The downlink physical channel may correspond to a set of resource elements that convey information generated in a higher layer. The downlink physical channel may be a physical channel used in a downlink component carrier. The radio transceiver 30 may transmit the downlink physical channel. The radio transceiver 10 may receive the downlink physical channel. In the downlink of the wireless communication system according to one aspect of the present embodiment, some or all of the following downlink physical channels may be used. ·PBCH(Physical Broadcast Channel) ·PDCCH (Physical Downlink Control Channel) ·PDSCH(Physical Downlink Shared Channel)

[0137] The PBCH is transmitted to carry Master Information Blocks (MIBs) and / or physical layer control information, which is information generated in the physical layer. The MIBs are RRC messages delivered from higher layers on the Broadcast Control Channel (BCCH).

[0138] PDCCH is used to transmit (transmit) downlink control information (DCI). The downlink control information may be placed in the PDCCH. The terminal device 1 may receive the PDCCH in which the downlink control information is arranged. Alternatively, a PDCCH in which downlink control information is allocated may be transmitted.

[0139] The downlink control information may be transmitted with a DCI format. The DCI format may be interpreted as a format of the downlink control information. The DCI format may be It may also be interpreted as a set of downlink control information set in a certain downlink control information format.

[0140] The base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. Here, the terminal device 1 may monitor the PDCCH to acquire the downlink control information. Unless otherwise specified, the DCI format and the downlink control information may be described as equivalent. For example, the base station device 3 may notify the terminal device 1 of downlink control information using a PDCCH with a DCI format. The terminal device 1 may transmit the downlink control information included in the detected DCI format to the terminal device 1. In addition, the terminal device 1 may control the radio transmission / reception unit 10 using the downlink control information included in the detected DCI format. It may be controlled.

[0141] The downlink control information may include at least one of a downlink grant (DL grant) or an uplink grant (UL grant). The DCI format used for scheduling the PDSCH is the downlink DCI format. The DCI format used for scheduling the PUSCH is also called the uplink DCI format. It is also called downlink assignment (DL assignment) or downlink allocation (DL allocation).

[0142] DCI format 0_0, DCI format 0_1, DCI format 1_0, and DCI format DCI formats such as DCI format 0_0 and DCI format 0_1 ​​are used. The uplink DCI format is a general term for DCI format 0_0, DCI format 0_1, etc. The downlink DCI format is a general term for DCI format 1_0 and DCI format 1_1, etc.

[0143] DCI format 0_0 is used for scheduling PUSCH allocated to a certain cell. DCI format 0_1 ​​is used for scheduling PUSCHs allocated to a cell. DCI format 1_0 is used for scheduling PDSCHs allocated to a cell. DCI format 1_1 is used for scheduling PDSCHs allocated to a cell. Used for rings.

[0144] DCI format 2_9 may be used to activate or deactivate the cell DTX / DRX configuration of one or more serving cells for one or more UEs. DCI format 2_9 may be transmitted with a CRC scrambled by the NES-RNTI. Mat 2_9 is composed of some or all of the following information: Block number Cell DTX / DRX indication

[0145] Whether the DCI format is an uplink DCI format or a downlink DCI format A DCI format identifier field (Identifier for DCI formats field) indicating whether the DCI format is a A time domain resource assignment field indicating time domain resource assignment may be included in the DCI format. A frequency hopping flag field indicating whether frequency hopping is applied may be included in the DCI format. Channel modulation The DCI format may include an MCS field (Modulation and Coding Scheme field) indicating one or both of the modulation scheme and the target coding rate. The DCI format may include a CSI request field indicating an instruction for reporting CSI. A BWP field indicating the BWP to which the channel is assigned may be included in the DCI format. A PDSCH to HARQ feedback timing indicator field indicating the timing at which the HARQ-ACK is transmitted may be included in the DCI format. A PUCCH resource indicator field indicating a PUCCH resource may be included in the DCI format. Note that various DCI formats may further include fields different from the above-mentioned fields.

[0146] A downlink grant is used for scheduling one PDSCH in one serving cell. The downlink grant is at least used for scheduling the PDSCH in the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling the PDSCH in a slot different from the slot in which the downlink grant is transmitted. It is used for scheduling at least one PUSCH in the serving cell.

[0147] The PDSCH may be transmitted to transmit a transport block. The PDSCH may be used to transmit a transport block. The transport block may be allocated to the PDSCH. The base station device 3 may transmit the PDSCH in which the transport block is allocated. The terminal device 1 receives the PDSCH in which the transport block is allocated. Good too.

[0148] The downlink physical signal may correspond to a set of resource elements. The downlink physical signal does not have to be used to transmit information generated in a higher layer. The downlink physical signal may be used to transmit information generated in a physical layer. The downlink physical signal may be a physical signal used in a downlink component carrier. The radio transceiver unit 10 may receive the downlink physical signal. The radio transceiver unit 30 may transmit the downlink physical signal. In the downlink of the wireless communication system according to one aspect of the present embodiment, at least some or all of the following downlink physical signals may be used. ·Synchronization signal (SS) ·DL DMRS(DownLink DeModulation Reference Signal) ·CSI-RS(Channel State Information-Reference Signal) ·DL PTRS(DownLink Phase Tracking Reference Signal)

[0149] The synchronization signal is used by the terminal device 1 to synchronize the frequency domain and / or the time domain of the downlink. The synchronization signal includes a PSS (Primary Synchronization Signal) and and SSS (Secondary Synchronization Signal).

[0150] The SS block (SS / PBCH block) contains at least some or all of the PSS, SSS, and PBCH. It is composed of at least

[0151] The antenna ports for the PSS, SSS, PBCH, and DMRS for the PBCH may be the same.

[0152] The PBCH for which a PBCH symbol is transmitted in a certain antenna port is a DMRS for the PBCH that is arranged in a slot to which the PBCH is mapped, and is a SS / PBCH block including the PBCH. The PBCH may be estimated by the DMRS for the PBCH included in

[0153] DL DMRS is the sum of DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH. It is a title.

[0154] The set of antenna ports for DMRS for PDSCH (DMRS related to PDSCH, DMRS included in PDSCH, DMRS corresponding to PDSCH) is given based on the set of antenna ports for the PDSCH. For example, the set of antenna ports for a DMRS for a PDSCH may be the same as the set of antenna ports for the PDSCH.

[0155] The propagation path of a PDSCH may be estimated from the DMRS for that PDSCH. A set of resource elements on which a DMRS symbol is transmitted and the DMRS symbol for the PDSCH are transmitted. When a set of resource elements on which symbols of a PDSCH are transmitted is included in the same precoding resource group (PRG), the PDSCH on which the symbols of the PDSCH are transmitted for an antenna port may be estimated by the DMRS for the PDSCH.

[0156] The antenna port of the DMRS for the PDCCH (DMRS related to the PDCCH, DMRS included in the PDCCH, DMRS corresponding to the PDCCH) may be the same as the antenna port for the PDCCH.

[0157] The propagation path of a PDCCH may be estimated from the DMRS for that PDCCH. A set of resource elements on which a DMRS symbol is transmitted and the symbol of the DMRS for the PDCCH are If the same precoder is applied (or is assumed to be applied, or is assumed to be applied) in the set of resource elements on which symbols of a PDCCH are transmitted, the PDCCH on which a symbol of the PDCCH on a certain antenna port is transmitted may be estimated by the DMRS for the PDCCH.

[0158] The BCH (Broadcast CHannel), the UL-SCH (Uplink-Shared CHannel), and the DL-SCH (Downlink-Shared CHannel) are transport channels.

[0159] The BCH of the transport layer may be mapped to the PBCH of the physical layer. The transport blocks delivered from higher layers on the BCH of the transport layer are mapped to the PBCH of the physical layer. The UL-SCH of the transport layer may also be mapped to the PUSCH of the physical layer. stomach.

[0160] The transport layer may apply Hybrid Automatic Repeat reQuest (HARQ) to the transport block.

[0161] BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, BCCH uses MIB. The CCCH may be used to deliver an RRC message including RRC parameters common to multiple terminal devices 1, or an RRC message including system information. The CCCH may also be used to transmit an RRC message including RRC parameters common to multiple terminal devices 1. Here, the CCCH may be used to deliver an RRC message including RRC parameters common to multiple terminal devices 1, for example. The DCCH may also be used for RRC messages dedicated to a certain terminal device 1. Here, the DCCH may be used to transmit messages, for example, when an RRC connection is established. It may also be used for the terminal device 1.

[0162] The BCCH may be mapped to the BCH or DL-SCH. RRC messages containing system information other than MIB may be delivered on the BCH. In addition, CCCH is mapped to either DL-SCH or UL-SCH. In other words, RRC messages mapped to CCCH may be delivered on either DL-SCH or UL-SCH. In addition, the DCCH may be mapped to either the DL-SCH or the UL-SCH, i.e., an RRC message mapped to the DCCH may be delivered on either the DL-SCH or the UL-SCH.

[0163] The UL-SCH may be mapped to the PUSCH. The DL-SCH may be mapped to the PDSCH. BCH may be mapped to the PBCH.

[0164] The media access control layer processing unit 15 may perform a random access procedure. The media access control layer processing unit 15 selects a RACH occasion for transmitting a random access preamble. The medium access control layer processing unit 15 may determine to transmit a random access preamble in the RACH occasion used for the first random access channel. The medium access control layer processing unit 15 receives the RACH used for the second random access channel. It may be determined to transmit a random access preamble on an occasion.

[0165] For example, downlink control information including a downlink grant or an uplink grant is transmitted and received on a PDCCH, including a C-RNTI (Cell-Radio Network Temporary Identifier).

[0166] One physical channel may be mapped to one serving cell. One physical channel may be mapped to one BWP configured on one carrier included in one serving cell. It may be possible to

[0167] One or more control resource sets (CORESET: Control Resource SET) may be configured in the terminal device 1. The terminal device 1 may transmit a PDCCH in one or more control resource sets. Here, monitoring the PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that the PDCCH may include one or more PDCCH candidates and The PDCCH monitoring may also include a set of PDCCH and / or PDCCH candidates. and / or monitoring and detecting the DCI format transmitted via the PDCCH.

[0168] 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 (CCEs) may be configured in the control resource set, and an index (CCE index) may be assigned to each CCE.

[0169] The set of PDCCH candidates monitored by the terminal device 1 is defined in terms of a search space. The set of candidates is given by the search space.

[0170] The search space may be configured to include one or more PDCCH candidates of one or more aggregation levels. The aggregation level of the PDCCH candidates is determined by the number of CCEs constituting the PDCCH. The PDDCH candidates may be mapped to one or more CCEs.

[0171] The search area set may be configured to include at least one or more search areas, and an index (search area index) may be assigned to each search area.

[0172] Each search space set may be associated with at least one control resource set. Each search space set may be included in one control resource set. Each search space set may be given an index of the control resource set associated with that search space set.

[0173] The terminal device 1 performs blind search for PDCCH candidates included in a search space in a control resource set. By transmitting the PDCCH and / or DCI for the terminal device 1, it is possible to detect the PDCCH and / or DCI for the terminal device 1.

[0174] In various aspects of the present embodiment, unless otherwise specified, the number of resource blocks refers to the number of resource blocks in the frequency domain.

[0175] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto the PUCCH and transmit the UCI. The terminal device 1 may multiplex the UCI onto the PUSCH and transmit the UCI. The UCI may include at least one of downlink channel state information (CSI), a scheduling request (SR) indicating a request for PUSCH resources, and a hybrid automatic repeat request ACKnowledgement (HARQ-ACK) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0176] HARQ-ACK is also known 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. It may also be called.

[0177] If the data is successfully decoded, an ACK is generated for the data. If the data is not decoded correctly, a NACK is generated for the data. The HARQ-ACK may include at least HARQ-ACK bits corresponding to at least one transport block. The HARQ-ACK bits may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or more transport blocks. The HARQ-ACK may be generated using a HARQ-ACK codebook including one or more HARQ-ACK bits. The HARQ-ACK bit corresponding to one or more transport blocks may mean that the HARQ-ACK bit corresponds to a PDSCH including the one or more transport blocks.

[0178] HARQ control for one transport block may be called an HARQ process. One HARQ process identifier may be assigned to each HARQ process. It includes a field indicating a process identifier (HARQ process number).

[0179] An NDI (New Data Indicator) is indicated in a DCI format for each HARQ process. For example, an NDI field is included in a DCI format (DL assignment) that includes scheduling information for PDSCH. The NDI field is 1 bit. The terminal device 1 stores (stores) an NDI value for each HARQ process. The base station device 3 stores (stores) an NDI value for each HARQ process for each terminal device 1. The terminal device 1 detects the NDI field of the DCI format. The base station device 3 sets the updated NDI value or the NDI value that is not updated in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 receives the HARQ process identifier field of the detected DCI format. For the HARQ process corresponding to the value, the stored NDI value is updated using the NDI field of the detected DCI format.

[0180] The terminal device 1 receives the data based on the value of the NDI field in the DCI format (DL assignment). The terminal device 1 determines whether the received transport block is a new transmission or a retransmission. ... When the base station device 3 transmits a transport block for new transmission in a certain HARQ process, it toggles the value of the NDI stored for that HARQ process and transmits the toggled NDI to the terminal device 1. When the base station device 3 transmits a transport block for retransmission in a certain HARQ process, it If so, the terminal device 1 does not toggle the value of the NDI stored for that HARQ process, and transmits the non-toggled NDI to the terminal device 1. The terminal device 1 compares the value of the NDI field of the detected DCI format with the value of the NDI previously received for a transport block of a certain HARQ process, and If it has not been toggled (if it is the same), it is determined that the received transport block is a retransmission. Note that toggling here means switching to a different value.

[0181] The terminal device 1 transmits HARQ-ACK information in a slot indicated by the value of the HARQ indication field included in DCI format 1_0 or DCI format 1_1 corresponding to PDSCH reception. may be reported to the base station device 3 using a HARQ-ACK codebook.

[0182] The terminal device 1 may report HARQ-ACK information for PDSCH reception in slot n by transmitting a PUCCH and / or a PUSCH in slot n+k, where k is the number of PUCCHs for the PDSCH reception. of the slot indicated by the HARQ indication field included in the corresponding DCI format. Alternatively, if the HARQ indication field is not included in the DCI format, k may be given by a higher layer parameter.

[0183] The higher layer parameters are parameters included in higher layer signals. The higher layer signals may be RRC (Radio Resource Control) signaling or MAC CE (Medium Access Control Control Element). Here, the higher layer signals may be RRC layer signals or MAC layer signals.

[0184] The higher layer signaling may be common RRC signaling. The RRC signaling has at least some or all of the following features C1 to C3: That's fine. Feature C1) Mapped to BCCH logical channel or CCCH logical channel Feature C2) Includes at least the radioResourceConfigCommon information element Feature C3) Mapped to PBCH

[0185] The radioResourceConfigCommon information element (RRC signaling) may include information indicating a configuration commonly used in the serving cell. The configuration commonly used in the serving cell may include at least a RACH configuration. The RACH configuration may at least indicate one or more random access preamble indices. The RACH configuration may at least indicate time / frequency resources of a PRACH.

[0186] The information indicating the setting (configuration) of the RACH includes information indicating the RACH occasion. The RACH occasion may be indicated in the form of a PRACH Configuration Index. The PRACH Configuration includes the RACH preamble format, a starting symbol indicating the starting position of the symbol where the RACH is arranged in the slot, the PRACH duration, the RACH occasion, etc. A plurality of PRACH Configurations are configured in advance, and each PRACH Configuration is assigned an index called a PRACH Configuration Index. The RACH occasion is indicated by information indicating the subframe number in which the RACH is arranged. Note that the PRACH configuration may indicate the RACH occasion for 10 subframes, and the RACH occasion may be repeated every 10 subframes. For example, For example, the period of the RACH occasion is indicated by the number of subframes, and can be 1, 2, 4, 8, For example, the period of the RACH occasion may be the number of slots. , and may be 1, 2, 4, 8, 16, or 32. The period of the occasion depends on the position of the subframe in which the RACH is placed and the slot within the subframe. The location of the target may be indicated.

[0187] The information indicating the RACH setting (configuration) may include information indicating the number of RACH occasions per SSB (ssb-perRACH-OccasionAndCB-PreamblesPerSSB). For example, eight RACH occasions, four RACH occasions, two RACH occasions, or one RACH occasion may correspond to one SSB. For example, one RACH occasion may correspond to every two SSBs. For example, one RACH occasion may correspond to every four SSBs. For example, one RACH occasion may correspond to every eight SSBs. For example, one RACH occasion may correspond to every 16 SSBs. The information indicating the RACH setting (configuration) (ssb-perRACH-OccasionAndCB-PreamblesPerSSB) may include information indicating the number of random access preambles (Contention Based preambles) per SSB. For example, 4, 8, 12, 16, or 24 per SSB may be included. Alternatively, 28, 32, 36, 40, 44, 48, 52, 56, 60, or 64 random access preambles (Contention Based preambles) may be supported.

[0188] The information indicating the RACH configuration may include information indicating the maximum number of retransmissions of the random access preamble. More specifically, this is the maximum number of retransmissions of the random access preamble before declaring the random access procedure a failure. For example, any of 3, 4, 5, 6, 7, 8, 10, 20, 50, 100, or 200 retransmissions may be indicated.

[0189] The information indicating the RACH configuration (configuration) may include information for the first random access channel. The information indicating the RACH configuration (configuration) may include information for the second random access channel. The information indicating the RACH configuration (configuration) for the first random access channel may include information indicating a duration. For example, the duration is indicated in milliseconds, and any one of 16 ms, 32 ms, and 64 ms may be indicated. Note that other millisecond values ​​may be indicated for the duration. For example, the duration is indicated by the number of subframes, and any one of 16, 32, 48, and 64 may be indicated. Note that other values ​​of the number of subframes may be indicated for the duration. For example, the duration is indicated by the number of slots, and any one of 16, 32, 48, and 64 may be indicated. Note that other values ​​of the number of slots may be indicated for the duration.

[0190] The information indicating the configuration (structure) of the RACH for the first random access channel may include information indicating the RACH occasion, i.e., information indicating the period of the RACH occasion. The information indicating the configuration (structure) of the RACH for the second random access channel may include information indicating the period of the RACH occasion. The first random access channel may include information indicating the period of the RACH occasion. The information indicating the configuration (configuration) of the RACH for the first random access channel may include information indicating the maximum number of retransmissions of the random access preamble. The information indicating the configuration (configuration) of the RACH for the second random access channel may include information indicating the maximum number of retransmissions of the random access preamble. The information indicating the configuration (configuration) of the RACH for a plurality of first random access channels may include information indicating a plurality of configurations.

[0191] The information indicating the configuration (configuration) of the RACH for the first random access channel and the information indicating the configuration (configuration) of the RACH for the second random access channel may each independently include information indicating the number of random access preambles used for contention-based random access and contention-free random access. For example, any one of 1 to 63 may be indicated as the number of random access preambles used for contention-based random access and contention-free random access. The information indicating the configuration (configuration) of the RACH for the first random access channel and the information indicating the configuration (configuration) of the RACH for the second random access channel may each independently include information indicating the number of random access preambles used for contention-based random access. For example, the number of random access preambles used in contention-based random access may be any of 1 to 63.

[0192] The information indicating the configuration (structure) of the RACH for the first random access channel and the information indicating the configuration (structure) of the RACH for the second random access channel may each independently include information indicating the length of a random access response window used to detect a random access response. For example, the length of the random access response window may be indicated by the number of slots, and any of the numbers of slots, 1, 2, 4, 8, 10, 20, 40, and 80, may be indicated.

[0193] The information indicating the setting (configuration) of the RACH for the first random access channel and the information indicating the setting (configuration) of the RACH for the second random access channel each include a setting (configuration) of the PRACH. Alternatively, information indicating the power ramping step for the signal may be independently included. For example, the power ramping step may be indicated as 0 dB, 2 dB, 4 dB, or 6 dB.

[0194] The information indicating the setting (configuration) of the RACH for the first random access channel and the information indicating the setting (configuration) of the RACH for the second random access channel may each independently include information indicating the number of PRACH transmission units frequency-multiplexed in one time instance. For example, the number of PRACH transmission units that are frequency multiplexed in one time instance is One, two, four or eight may be shown.

[0195] The information indicating the configuration (structure) of the RACH for the first random access channel and the information indicating the configuration (structure) of the RACH for the second random access channel may each independently include information indicating the value of the contention resolution timer. For example, the value of the contention resolution timer may be indicated by the number of subframes, and may indicate any of the numbers of subframes: 8, 16, 24, 32, 40, 48, 56, and 64.

[0196] The information indicating the configuration (configuration) of the RACH for the first random access channel and the information indicating the configuration (configuration) of the RACH for the second random access channel may each independently include information indicating a value of an initial random access preamble power (a target power level at the network receiver side). For example, the value of the initial random access preamble power may be indicated as any value between −202 dB and −60 dB in 2 dB increments.

[0197] The higher layer signaling may be dedicated RRC signaling. The dedicated RRC signaling has at least some or all of the following characteristics D1 to D2: Good too. Feature D1) Mapped to DCCH logical channel Feature D2) At least the radioResourceConfigDedicated information element is included

[0198] The radioResourceConfigDedicated information element may include at least information indicating a setting specific to the terminal device 1. The radioResourceConfigDedicated information element includes information indicating a setting of the BWP. The configuration of the BWP may at least indicate a frequency resource of the BWP.

[0199] For example, the MIB, the first system information, and the second system information may be included in the common RRC signaling. Also, a message of an upper layer that is mapped to a DCCH logical channel and includes at least radioResourceConfigCommon may be included in the common RRC signaling. Also, a message of an upper layer that is mapped to a DCCH logical channel and includes at least radioResourceConfigCommon information may be included in the common RRC signaling. Higher layer messages that do not contain information elements may be included in dedicated RRC signaling. , a higher layer message that is mapped to the DCCH logical channel and that includes at least the radioResourceConfigDedicated information element may be included in the dedicated RRC signaling.

[0200] The first system information may include at least information related to RACH resources. The first system information may include information indicating a random access configuration (RACH setting). The first system information may include at least information related to setting up an initial connection, and the second system information may be system information other than the first system information.

[0201] The radioResourceConfigDedicated information element may include at least information related to RACH resources. The radioResourceConfigDedicated information element may include at least information related to setting up an initial connection.

[0202] The information related to the reception of the PDCCH may include information related to an ID indicating a destination of the PDCCH. The ID indicating a destination of the PDCCH may be used for scrambling the CRC bits added to the PDCCH. The ID indicating the destination of the PDCCH may be an ID used in the scrambling of the CRC bits added to the PDCCH. The terminal device 1 may attempt to receive the PDCCH based at least on the information related to the ID included in the PBCH. can.

[0203] The RNTI may include a C-RNTI (Common-RNTI), a Temporary C-RNTI (TC-RNTI), and a Random Access-RNTI (RA-RNTI). The C-RNTI is used at least for scheduling user data for an RRC-connected terminal device 1. The Temporary C-RNTI is used at least for scheduling a random access message 4. The Temporary C-RNTI is used to schedule a PDSCH including data mapped to a CCCH in a logical channel. The RA-RNTI is used at least for random access message 2. It is used at least for scheduling.

[0204] The PDSCH is used at least to transmit / receive transport blocks. The PDSCH may be used at least to transmit / receive random access message 2 (random access response). The PDSCH contains parameters used for initial access. The PDSCH may be used at least to transmit / receive system information including data. , may be used at least to send / receive random access messages 4.

[0205] The terminal device 1 attempts to establish a connection with the base station device 3. Fig. 5 is a diagram showing an example of an initial connection procedure (4-step contention based RACH procedure) according to one aspect of this embodiment. The initial connection procedure includes at least a part of steps 5101 to 5104. Here, a contention-based random access procedure will be described. Note that the contention-based random access procedure is also used for purposes other than the initial connection.

[0206] The terminal device 1 performs downlink time-frequency synchronization prior to performing step 5101. A synchronization signal (SSB) is used for the terminal device 1 to perform downlink time-frequency synchronization. The terminal device 1 uses the synchronization signal transmitted from the base station device 3.

[0207] The synchronization signal may be transmitted including an ID (cell ID) of the target cell. The synchronization signal may be transmitted including a sequence generated based at least on the cell ID. Including the cell ID in the synchronization signal may mean that the sequence of the synchronization signal is provided based on the cell ID. The synchronization signal may be transmitted by applying a beam.

[0208] A beam is a phenomenon in which antenna gain varies depending on the direction. The beams may be provided based at least on a phase shift of the carrier signals. The beams may also be provided by applying a precoder.

[0209] Step 5101 is a step in which the terminal device 1 transmits a RACH to the base station device 3. SSBs are associated with RACH occasions. Multiple RACH occasions are associated with an SSB. The terminal device 1 recognizes the RACH occasion associated with each SSB from information indicating the RACH configuration. The terminal device 1 selects a RACH occasion for transmitting a RACH from one or more RACH occasions corresponding to the detected SSB. The terminal device 1 transmits the RACH on the selected RACH occasion.

[0210] The terminal device 1 receives the RACH occasion indicated by the information indicating the configuration of the random access channel. The terminal device 1 selects the RACH occasion indicated by the information indicating the configuration of the first random access channel. The terminal device 1 selects the RACH occasion indicated by the information indicating the configuration of the second random access channel. The terminal device 1 selects the RACH occasion indicated by the indicated information. A RACH occasion within the interval indicated by the information indicating the channel configuration is selected.

[0211] The terminal device 1 randomly selects one random access preamble from among a plurality of random access preambles indicated by the information indicating the configuration of the random access channel. The number of random access preambles available for contention-based random access may be set independently for the first random access channel and the second random access channel.

[0212] The terminal device 1 may set the transmission power of the random access preamble based on the initial random access preamble power indicated in the information indicating the configuration of the random access channel. The initial random access preamble power values ​​may be set independently for the first random access channel and the second random access channel.

[0213] 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 called a random access message 2. The random access message 2 may be transmitted via a PDSCH. The PDSCH including the access message 2 is scheduled by the PDCCH. The included CRC bits may be scrambled by the RA-RNTI. The random access message 2 may be transmitted including a special uplink grant. The special uplink grant is also called a random access response grant. The special uplink grant may be included in the PDSCH that includes the random access message 2. The access response grant may include at least the Temporary C-RNTI.

[0214] The terminal device 1 determines whether it receives a random access message 2 (random access response) within the random access response window. If it determines that it has not received the random access message 2 within the random access response window, it determines that it has not detected the random access message 1 (random access preamble) in the base station device 3, and resumes the processing from step 5101.

[0215] The terminal device 1 may set a random access response window of a value (length) indicated by information indicating the configuration of the random access channel. The terminal device 1 may set a random access response window of a value (length) indicated by information indicating the configuration of the first random access channel. The terminal device 1 may set a random access response window of a value (length) indicated by information indicating the configuration of the second random access channel.

[0216] Step 5103 is a step in which the terminal device 1 sends an RRC connection request to the target cell. The RRC connection request is also called a random access message 3. The random access message 3 may be transmitted via a PUSCH scheduled by a random access response grant. The message 3 may include an ID used to identify the terminal device 1. The ID may be an ID managed in a higher layer. The ID may be an SAE Temporary Mobile Subscriber Identity (S-TMSI). The ID may be mapped to a CCCH in a logical channel.

[0217] Step 5104 is a step in which the base station device 3 transmits a contention resolution message to the terminal device 1. The random access message 3 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 that includes the random access message 4. The random access message 4 may include a collision avoidance ID. Here, the collision avoidance ID is used to resolve collisions when multiple terminal devices 1 transmit signals using the same radio resources. The collision avoidance ID is also referred to as a UE contention resolution identity.

[0218] In step 5104, the terminal device 1 that transmitted the random access message 3 including an ID (e.g., S-TMSI) used to identify the terminal device 1 monitors the random access message 4 including a collision resolution message. If the collision avoidance ID included in the random access message 4 is equal to the ID used to identify the terminal device 1, the terminal device 1 may consider that collision resolution has been successfully completed and set the value of Temporary C-RNTI in the C-RNTI field. The terminal device 1 with the value of Temporary C-RNTI set in the C-RNTI field is considered to have completed the RRC connection.

[0219] The terminal device 1 determines whether or not it receives a random access message 4 (collision resolution message) within the contention resolution timer. Note that the measurement of the contention resolution timer is started due to the transmission of the random access message 3. If the terminal device 1 determines that it has not received the random access message 4 within the contention resolution timer, it determines that the random access message 3 has not been received at the base station device 3, and resumes processing from step 5101.

[0220] The terminal device 1 may set a contention resolution timer of a value (length) indicated in the information indicating the configuration of the random access channel. The terminal device 1 may set a contention resolution timer of a value (length) indicated in the information indicating the configuration of the first random access channel. The terminal device 1 may set a contention resolution timer of a value (length) indicated in the information indicating the configuration of the second random access channel.

[0221] In the series of random access procedures, the number of times step 5101 is performed corresponds to the number of times the random access preamble is retransmitted. When the random access preamble is retransmitted, power ramping may be applied to the setting of the transmission power of the random access preamble. In other words, the transmission power may be set higher by the value of power ramping. The terminal device 1 may set the value indicated in the information indicating the configuration of the random access channel as the upper limit of the number of times the random access preamble is retransmitted. The terminal device 1 may set the value indicated in the information indicating the configuration of the first random access channel as the upper limit of the number of times the random access preamble is retransmitted. The terminal device 1 may set the value indicated in the information indicating the configuration of the second random access channel as the upper limit of the number of times the random access preamble is retransmitted. The terminal device 1 sets the value indicated in the information indicating the configuration of the random access channel as the value of power ramping. The terminal device 1 may set the value indicated in the information indicating the configuration of the first random access channel to the value of power ramping. The terminal device 1 may set the value indicated in the information indicating the configuration of the second random access channel to the value of power ramping.

[0222] 6 is a diagram showing an example of adaptation of a random access channel according to one aspect of the present embodiment. Here, a case where the period of the second random access channel is configured with 32 slots is shown. Here, a case where the period of the first random access channel is configured with 2 slots is shown. Here, a case where RACH occasion candidates with a period of 2 slots for the first random access channel are configured in advance in the terminal device 1 using RRC signaling is shown. Specifically, a case where 16 slots are considered as one set, and RACH occasion candidates are configured for the third, fifth, seventh, ninth, eleventh, thirteenth, and fifteenth slots in the set is shown. Here, a case where the interval (the interval from the timing at which use of the configured RACH occasion candidates starts to the timing at which they end) is set to eight slots is shown.

[0223] The second random access channel is allocated to uplink slot #1. The base station device 3 transmits a signal indicating that allocation of the first random access channel will start in downlink slot #7. The terminal device 1 receives a signal indicating that allocation of the first random access channel will start in downlink slot #7. Uplink slot #11 is the timing at which use of the RACH occasion candidate set for the first random access channel starts. Uplink slot #18 is the timing at which use of the first random access channel starts. The timing at which the use of the RACH occasion candidates configured for the random access channel ends. The first random access channel is assigned to slots #11, #13, #15, and #17 in this uplink section. The first random access channel is not assigned to slots after this section. The second random access channel is assigned to slot #32 in the uplink.

[0224] The terminal device 1 performs a backoff process (random backoff process) for selecting the first random access channel to be used. The terminal device 1 randomly generates a backoff value within a preset period (window) (first period) (first window). The terminal device 1 sets the backoff value. The base station device 3 may set the period value for the terminal device 1. The base station device 3 may transmit information indicating the period value to the terminal device 1 in system information. The terminal device 1 may receive information indicating the period value from the base station device 3 in system information. The base station device 3 transmits the information indicating the period value to the RRC The base station device 3 may transmit the information indicating the value of the period to the terminal device 1 by RRC signaling. The terminal device 1 may receive information indicating the value of the period from the base station device 3 by RRC signaling. The information may be transmitted to the terminal device 1 in a signal indicating that allocation of the first random access channel will start. The terminal device 1 may receive information indicating the value of the period from the base station device 3 in a signal indicating that allocation of the first random access channel will start.

[0225] The period may be defined by the number of slots. The backoff value may be defined by the number of slots. For example, the period is set to three slots. The terminal device 1 The number of slots within the range of the period, that is, the number of slots within the range of three slots, is randomly selected. The terminal device 1 randomly selects either 0 slots, 1 slot, 2 slots, or 3 slots. The terminal device 1 selects and uses the first random access channel after backoff from the start timing of the period. The terminal device 1 selects the first random access channel of the slots after the randomly selected number of slots from the start slot of the period. In FIG. 6, for example, if the terminal device 1 selects three slots as the backoff value, the terminal device 1 selects the first random access channel of slot #15. 6, for example, if the terminal device 1 selects 0 slots as the backoff value, the terminal device 1 selects the first random access channel of slot #11. Although not shown in FIG. 6, for example, if the terminal device 1 selects 1 slot or 2 slots as the backoff value, the terminal device 1 selects the first random access channel of slot #13.

[0226] The terminal device 1 may not select the first first random access channel after the backoff from the first slot of the section (after the backoff), but may select the second, third or subsequent first random access channel.

[0227] As described above, in the embodiment of the present invention, by setting a backoff and selecting a first random access channel after the backoff (after the backoff) from the first slot of the period, it is possible to avoid concentration of terminal devices 1 using the first random access channel of the period, and to efficiently adapt the physical random access channel PRACH. This makes it possible to

[0228] The base station device 3 and the program operating in the terminal device 1 according to the embodiment of the present invention are programs (programs that make a computer function) that control a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiment according to the embodiment of the present invention. The information handled by these devices is temporarily stored in RAM (Random Access Memory) during processing, and then stored in Flash ROM (Read Only Memory) or other memory. It is stored in various ROMs and HDDs (Hard Disk Drives) and is read by the CPU as needed. It is read, modified and written.

[0229] Note that the terminal device 1 and part of the base station device 3 in the above-described embodiment may be realized by a computer. In this case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to realize the control function.

[0230] The term "computer system" used here refers to a computer system built into the terminal device 1 or base station device 3, and includes hardware such as an OS and peripheral devices. Also, the term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into the computer system.

[0231] Furthermore, the term "computer-readable recording medium" may include a medium that dynamically stores a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, or a medium that stores a program for a certain period of time, such as a volatile memory within a computer system that serves as a server or client in such a case. The program may also be one that realizes part of the above-mentioned functions, or one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0232] The terminal device 1 may comprise at least one processor and at least one memory containing computer program instructions (computer program). The memory and computer program instructions (computer program) may be configured to cause the terminal device 1 to perform the operations and processes described in the above embodiments using the processor. The base station device 3 may comprise at least one processor and at least one memory containing computer program instructions (computer program). Memory and computer program instructions (computer program) Alternatively, a processor may be used to cause the base station device 3 to perform the operations and processes described in the above embodiments.

[0233] Furthermore, the base station device 3 in the above-described embodiment can also be realized as a collection (device group) consisting of multiple devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 according to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. Furthermore, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as a collection.

[0234] Furthermore, the base station device 3 in the above-described embodiment is an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). In addition, the base station device 3 in the above-described embodiment may be configured to It may have some or all of the functions of its higher-level node.

[0235] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiments 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 formed into a chip, or some or all of them may be integrated into a chip. The integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology, it may also be possible to use an integrated circuit based on that technology.

[0236] Furthermore, in the above-described embodiment, a terminal device is described as an example of a communication device, but the present invention is not limited to this and can also be applied to terminal devices or communication devices such as stationary or non-movable electronic devices installed indoors or outdoors, for example, AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0237] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the invention. Furthermore, the present invention is susceptible to various modifications within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, configurations in which elements described in the above embodiments are substituted with elements that achieve the same effect are also included. [Explanation of symbols]

[0238] 1(1A, 1B, 1C) Terminal equipment 3 Base station equipment 10, 30 Radio transmitter / receiver 11, 31 Antenna section 12, 32 RF section 13, 33 Baseband section 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims

1. A terminal device comprising a processor and a memory for storing computer program code, the terminal device executing the following operations: receiving information indicating a configuration of a first random access channel; the information indicating the configuration of the first random access channel including at least information indicating a first period of a random access channel opportunity; receiving a signal indicating that allocation of the first random access channel will start; setting a backoff value; and performing a random access procedure using the first random access channel at the random access channel opportunity that is after the backoff value from the start timing of allocation of the first random access channel.

2. A communication method used in a terminal device, the communication method including the steps of: receiving information indicating a configuration of a first random access channel; the information indicating the configuration of the first random access channel including at least information indicating a first period of a random access channel opportunity; receiving a signal indicating that allocation of the first random access channel will start; setting a backoff value; and performing a random access procedure using the first random access channel at the random access channel opportunity that is later than the backoff value from the start timing of allocation of the first random access channel.

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