Terminal device and communication method

Abstract

To allow a terminal device and a base station device to efficiently use resources.SOLUTION: A terminal device receives information indicating a threshold, determines whether reception quality is lower than the threshold, and if it determines that the reception quality is lower than the threshold, selects an SBFD (Sub-Band non-overlapping Full Duplex) slot to perform a random access procedure, and if it determines that the reception quality is not lower than the threshold, selects an uplink slot to perform the random access procedure.SELECTED DRAWING: Figure 3

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] In 3GPP, simultaneous existence of downlink and uplink in TDD (Time Division Duplex) A method to enable this is being studied (Non-Patent Document 1). A technology called Subband non-overlapping Full Duplex (SBFD) is being studied that configures subbands for both the upstream and downstream links. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Revised SID: Study on evolution of NR duplex operation", RP-222110, CMCC, 3GPP TSG RAN Meeting #97 Electronic Meeting, September 12-16, 2022 Summary of the Invention [Problem to be solved by the invention]

[0006] It is being considered to arrange slots in which only the uplink is configured and slots in which the uplink and downlink are divided in subband units. A terminal device that does not support SBFD cannot transmit uplinks in slots in which the uplink and downlink are divided in subband units, while a terminal device that supports SBFD can transmit uplinks in slots in which the uplink and downlink are divided in subband units (SBFD slots) and slots in which only the uplink is configured (uplink slots). In this situation, one aspect of the present invention provides a terminal device that can efficiently use resources, and a communication method used in the terminal device. [Means for solving the problem]

[0007] (1) In order to achieve the above object, one aspect of the present invention provides the following: 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 threshold, determining whether or not reception quality is lower than the threshold, selecting a subband non-overlapping full duplex (SBFD) slot to perform a random access procedure if it is determined that the reception quality is lower than the threshold, and selecting a subband non-overlapping full duplex (SBFD) slot to perform a random access procedure if it is determined that the reception quality is not lower than the threshold. , performing an uplink slot selection for performing a random access procedure; do.

[0008] (2) Furthermore, the reception quality is RSRP (Reference Signal Received Power).

[0009] (3) Furthermore, when a random access procedure is performed in the SBFD slot, a random access preamble in a long preamble format is transmitted, and when a random access procedure is performed in the uplink slot, a random access preamble in a short preamble format is transmitted. Send an access preamble.

[0010] (4) Furthermore, if the information indicating the threshold is not received, select either the SBFD slot or the uplink slot to perform the random access procedure.

[0011] (5) A second aspect of the present invention is a communication method used in a terminal device, comprising the steps of receiving information indicating a threshold, determining whether reception quality is lower than the threshold, and, if it is determined that the reception quality is lower than the threshold, selecting a Subband non-overlapping Full Duplex (SBFD) slot to perform a random access procedure, and and selecting an uplink slot for performing a random access procedure if it is determined that the quality is not less than the threshold.

[0012] (6) Furthermore, the reception quality is RSRP (Reference Signal Received Power).

[0013] (7) Furthermore, when a random access procedure is performed in the SBFD slot, a random access preamble in a long preamble format is transmitted, and when a random access procedure is performed in the uplink slot, a random access preamble in a short preamble format is transmitted. The method includes transmitting an access preamble.

[0014] (8) Further, if the information indicating the threshold is not received, the method includes the step of selecting either an SBFD slot or an uplink slot to perform the random access procedure. [Effects of the Invention]

[0015] According to the present invention, resources can be efficiently utilized by the terminal device and the base station device. [Brief explanation of the drawings]

[0016] [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. 2 is a diagram illustrating an example of a configuration of a radio frame according to an aspect of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described.

[0018] "A and / or B" may be a term that includes "A", "B", or "A and B".

[0019] 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.

[0020] 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).

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Slots may be indexed in the time domain, e.g., 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.

[0031] 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.

[0032] 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.

[0033] 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 may be used.

[0034] 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.

[0035] An example of the configuration of the terminal device 1 according to one aspect of this embodiment will be described below.

[0036] 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.

[0037] The wireless transceiver 10 performs physical layer processing.

[0038] 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.

[0039] 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.

[0040] 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 processing unit performs a process of receiving the PDCCH and a process of detecting the downlink control information. cormorant.

[0041] 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 processes such as demodulation and decoding on the PDSCH.

[0042] The receiver of the terminal device 1 receives the SSB and selects the SSB with the best reception conditions.

[0043] 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).

[0044] 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 RACH occasion is selected from one or more RACH occasions corresponding to the SSB selected by the receiving unit of the device 1. Select and transmit the RACH (random access preamble) on the selected RACH occasion. do.

[0045] 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.

[0046] 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.

[0047] 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 selects 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 is used for the physical channel and physical signal (i.e., the physical layer), the MAC layer, and the like. , PDCP layer, RLC layer, RRC layer processing or configuration related information. The parameters may be higher layer parameters.

[0048] 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.

[0049] 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.

[0050] The radio resource control layer processing unit 16 sets uplink slots, downlink slots, and SBFD slots based on the system information received from the base station device 3.

[0051] 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 transmission unit of the terminal device 1 transmits a RACH (random access preamble) at the set RACH occasion. The radio resource control layer processing unit 16 The threshold used to select a slot for performing the random access procedure is set based on information indicating the threshold used to select a slot for performing the random access procedure, which is included in the signaling.

[0052] The radio resource control layer processing unit 16 processes the RRC signaling (system The radio resource control layer processing unit 16 sets the RACH preamble format (PRACH preamble format) used in the uplink slot based on the system information received from the base station device 3. The RACH preamble format (PRACH preamble format) used in the SBFD slot is set based on the received RRC signaling (system information). In the uplink slot, a RACH preamble format (PRACH preamble format) of short preamble format is set. In the SBFD slot, a RACH preamble format (PRACH preamble format) of long preamble format is set. will be done.

[0053] The transmitting unit of the terminal device 1 determines whether the reception quality is lower than a threshold. If the transmitting unit of the terminal device 1 determines that the reception quality is lower than the threshold, it selects an SBFD slot as a slot for performing a random access procedure. If the transmitting unit of the terminal device 1 determines that the reception quality is not lower than the threshold, it selects an uplink slot as a slot for performing a random access procedure. Information on the reception quality is transmitted from the receiving unit of the terminal device 1 to the transmitting unit of the terminal device 1. The reception quality is, for example, RSRP (Reference Signal Received Power). The reception quality is measured based on, for example, SSB. The transmitting unit of the terminal device 1 transmits a random access preamble using a long preamble format in the uplink slot. Transmits a random access preamble. 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 (PRACH preamble format) with a signal configuration of a single slot. For example, the Long preamble format has a RACH preamble sequence length of 839 and a time length of 100 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 sequence length of The RACH preamble format is 839 and the time length is 1 slot (1 ms). The preamble format is Format 0 or Format 3.

[0054] The radio resource control layer processing unit 16 performs random access by RRC signaling from the base station device 3. If it is determined that the terminal device 1 has not received information indicating the threshold used to select a slot for performing the random access procedure, the transmitting unit of the terminal device 1 selects either an SBFD slot or an uplink slot for performing the random access procedure.

[0055] A medium access control layer processing unit (MAC layer processing unit) 15 performs MAC layer processing such as HARQ operation.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] An example of the configuration of the base station device 3 according to one aspect of this embodiment will be described below.

[0064] FIG. 4 is a schematic block diagram showing a 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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).

[0069] 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.

[0070] 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.

[0071] 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.

[0072] The radio resource control layer processing unit 36 performs settings related to a plurality of search spaces, each of which is indexed.

[0073] 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).

[0074] The radio resource control layer processing unit 36 sets the number of RACH occasions corresponding to each SSB. The radio resource control layer processing unit 36 sets the RACH occasions. Radio resource control layer processing unit 36 sets the RACH preamble format.

[0075] The radio resource control layer processing unit 36 sets a threshold value used to select a slot for performing the random access procedure. The base station device 3 transmits information indicating the threshold value used to select a slot for performing the random access procedure to the terminal by RRC signaling. If the radio resource control layer processing unit 36 determines not to set a threshold value used to select a slot for performing a random access procedure, information indicating the threshold value used to select a slot for performing a random access procedure is not transmitted to the terminal device 1.

[0076] The radio resource control layer processing unit 36 sets uplink slots, downlink slots, and SBFD slots.

[0077] A medium access control layer processing unit (MAC layer processing unit) 35 performs MAC layer processing such as HARQ operation.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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

[0083] 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.

[0084] 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.

[0085] The receiving unit of the base station device 3 receives the RACH. The receiving unit of the base station device 3 performs a process of detecting a random access preamble. The receiving unit of the base station device 3 performs a process of detecting a random access preamble in an uplink slot and an SBFD slot.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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)

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] HARQ-ACK for a transport block is also called HARQ-ACK for a PDSCH. Here, "HARQ-ACK for PDSCH" may refer to HARQ-ACK for a transport block included in the PDSCH.

[0098] A scheduling request may be used to request UL-SCH resources for an initial transmission. The scheduling request bit is either 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.

[0099] 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).

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] The PRACH transmits the random access preamble (random access message 1). The PRACH is used at least for the initial connection establishment procedure, handover procedure, connection re-establishment procedure, and 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.

[0105] 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)

[0106] UL DMRS is a general term for DMRS for PUSCH and DMRS for PUCCH.

[0107] 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.

[0108] The propagation path of the PUSCH may be estimated from the DMRS for the PUSCH.

[0109] 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.

[0110] The propagation path of the PUCCH may be estimated from the DMRS for the PUCCH.

[0111] 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)

[0112] 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).

[0113] 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.

[0114] 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.

[0115] 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 DCI format including the downlink control information to the terminal device 1. Furthermore, 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.

[0116] 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).

[0117] 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.

[0118] 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.

[0119] 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 in which the channel is allocated may be included in the DCI format. PDSCH to HARQ feedback timing indicator field is 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.

[0120] 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.

[0121] 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.

[0122] 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)

[0123] 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).

[0124] The SS block (SS / PBCH block) contains at least some or all of the PSS, SSS, and PBCH. It is composed of at least

[0125] The antenna ports for the PSS, SSS, PBCH, and DMRS for the PBCH may be the same.

[0126] 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

[0127] DL DMRS is the sum of DMRS for PBCH, DMRS for PDSCH, and DMRS for PDCCH. It is a title.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] The BCH (Broadcast CHannel), the UL-SCH (Uplink-Shared CHannel), and the DL-SCH (Downlink-Shared CHannel) are transport channels.

[0133] 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.

[0134] The transport layer may apply Hybrid Automatic Repeat reQuest (HARQ) to the transport block.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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 media access control layer processing unit 15 may select either an uplink slot or an SBFD slot as the slot for performing the random access procedure.

[0139] 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).

[0140] 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

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. Alternatively, the UCI may be multiplexed onto the PUCCH and transmitted. The terminal device 1 multiplexes the UCI onto the PUSCH and transmits the PUCCH. 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), or Physical Downlink Shared Channel (PDSCH)).

[0150] 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.

[0151] 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.

[0152] 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).

[0153] 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.

[0154] 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 does not toggle the value of the NDI stored for that HARQ process and transmits an untoggled NDI to the terminal device 1. When the base station device 3 transmits a transport block for retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for that HARQ process and transmits an untoggled NDI to the terminal device 1. When the base station device 3 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, it determines that the received transport block is a newly transmitted one. 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.

[0155] 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.

[0156] 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 PDSCHs 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.

[0157] 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.

[0158] 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

[0159] 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.

[0160] 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. An index is assigned to each RACH occasion. The RACH occasion is indicated by information indicating the subframe number in which the RACH is arranged. Note that the PRACH configuration indicates the RACH occasion for 10 subframes, and the RACH occasion is repeated every 10 subframes.

[0161] The information indicating the RACH setting (configuration) includes 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 correspond to each SSB. For example, one RACH occasion corresponds to each two SSBs. For example, one RACH occasion corresponds to each four SSBs. For example, one RACH occasion corresponds to each eight SSBs. For example, one RACH occasion corresponds to each 16 SSBs. The information indicating the RACH setting (configuration) (ssb-perRACH-OccasionAndCB-PreamblesPerSSB) includes information indicating the number of random access preambles (Contention Based preambles) per SSB. For example, four RACH occasions correspond to each SSB. , or 8, or 12, or 16, or 24, or 28, or 32, or 36, or 40, or 44, or 48, or 52, or 56, or 60, or It supports 64 random access preambles (Contention Based preambles).

[0162] The information indicating the setting (configuration) of the RACH may include information indicating the SBFD slot (information indicating which of the downlink slots is the SBFD slot). The information indicating the setting (configuration) of the RACH may include information indicating the frequency domain (plurality of physical resource blocks) in which uplink transmission can be performed in the SBFD slot. The information indicating the setting (configuration) of the RACH may include information indicating the frequency domain (plurality of physical resource blocks) in which the PRACH is allocated in the SBFD slot. The information indicating the setting (configuration) of the RACH may include information indicating a threshold used to select either an uplink slot or an SBFD slot as a slot for performing the random access procedure.

[0163] 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

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] 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 the RRC-connected terminal device 1. The Temporary C-RNTI is used at least for scheduling the random access message 4. The C-RNTI schedules the PDSCH containing data that is mapped to the CCCH in the logical channel. The RA-RNTI is used at least for random access message 2. It is used at least for scheduling.

[0170] 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.

[0171] 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 the present embodiment. The initial connection procedure includes at least a part of steps 5101 to 5104.

[0172] 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.

[0173] 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.

[0174] The beam refers to a phenomenon in which antenna gain varies depending on the direction. The beam may be generated based at least on the directivity of the antenna. The beam may also be generated based at least on a phase shift of a carrier signal. The beam may also be generated by applying a precoder.

[0175] 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.

[0176] 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.

[0177] 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 referred to as 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 is 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 the logical channel.

[0178] 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.

[0179] 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.

[0180] The terminal device 1 receives the transport included in the PDSCH including the random access message 4. HARQ-ACK, which is the error detection result for the block, is transmitted on the PUCCH.

[0181] FIG. 6 is a diagram showing an example of a radio frame configuration according to one aspect of this embodiment. Here, a case where a radio frame is configured in units of five slots will be described. In FIG. 6, In this figure, the horizontal axis represents time and the vertical axis represents frequency. Figure 6(a) shows an example where there are no SBFD slots. In Figure 6(a), the first, second, third, and fourth slots The first slot is a downlink slot, and the fifth slot is an uplink slot. In the downlink slot, the entire frequency band is used for transmitting and receiving downlink signals. In the uplink slot, the entire frequency band is used for transmitting and receiving uplink signals. In Figure 6(b), the SBFD slot is configured in the fourth slot, and the first, second, and third slots are used for transmitting and receiving uplink signals. The first slot is configured as a downlink slot, and the fifth slot is configured as an uplink slot. In the SBFD slot, for example, the uplink area (UL subband) is configured in the area (subband) in the middle of the frequency band, and the downlink area (DL subband) is configured in the upper and lower areas of the frequency band. Note that a guard band may be configured between the UL subband and the DL subband. Figure 6(c) shows the third and fourth slots. The figure shows a case where the SBFD slot is configured in the first slot, the first and second slots are configured as downlink slots, and the fifth slot is configured as an uplink slot. (d) shows that the SBFD slots are configured in the second, third, and fourth slots, and the first slot The first slot is configured as a downlink slot, and the fifth slot is configured as an uplink slot. Figure 6(e) shows the case where SBFD slots are configured in the first, second, third, and fourth slots, and an uplink slot is configured in the fifth slot.

[0182] The RACH preamble format (PRACH preamble format) used in the uplink slot is The RACH preamble format used in the SBFD slot (PRACH preamble format ) is set. In the uplink slot, a RACH preamble format (PRACH preamble format) of short preamble format is set. In the SBFD slot, a RACH preamble format (PRACH preamble format) of long preamble format is set.

[0183] A threshold value used to select a slot for performing the random access procedure is set. It is determined whether the reception quality is smaller than the threshold. If it is determined that the reception quality is smaller than the threshold, an SBFD slot is selected as the slot for performing the random access procedure. If it is determined that the reception quality is not smaller than the threshold, an uplink slot is selected as the slot for performing the random access procedure.

[0184] Poor reception quality means large path loss. When the path loss is large, the terminal device 1 requires large transmission power in order for the random access preamble to be properly detected in the base station device 3. On the other hand, there is an upper limit to the transmission power of the terminal device 1 in a single slot. Therefore, the terminal device 1 requiring large total transmission power preferentially selects the SBFD slot as the slot for performing the random access procedure, and transmits the random access preamble in a PRACH preamble format using multiple consecutive SBFD slots. By transmitting the SBFD preamble, resources can be used effectively. By having a terminal device 1 with not low (high) reception quality and not high (low) path loss, that is, a terminal device 1 that does not require high transmission power, select an uplink slot instead of selecting the SBFD slot as a slot for performing a random access procedure, it is possible to avoid unnecessary collisions and congestion of random access preambles in the SBFD slot. The base station device 3 can control the degree of resource congestion in the SBFD slot by controlling the value of the threshold. As a result, resources can be used effectively by the terminal device 1 and the base station device 3.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] The terminal device 1 may comprise at least one processor and at least one memory containing computer program instructions (computer programs). The memory and computer program instructions (computer program) may be configured to use a processor to cause the terminal device 1 to perform the operations and processes described in the above embodiments. The base station device 3 may be configured to include 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 use a processor to cause the base station device 3 to perform the operations and processes described in the above embodiments.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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]

[0195] 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 including a processor and a memory for storing computer program code, the terminal device receiving information indicating a threshold, determining whether reception quality is lower than the threshold, and selecting a subband non-overlapping full duplex (SBFD) slot to perform a random access procedure when it is determined that the reception quality is lower than the threshold, A terminal device that, when determining that the reception quality is not lower than the threshold, selects an uplink slot for performing a random access procedure.

2. The terminal device according to claim 1, wherein the reception quality is RSRP (Reference Signal Received Power). terminal equipment.

3. When performing a random access procedure in the SBFD slot, a random access preamble in a long preamble format is transmitted, and when performing a random access procedure in the uplink slot, a random access preamble in a short preamble format is transmitted.

2. The terminal device according to claim 1, wherein the terminal device transmits a signal having a plurality of alphanumeric characters.

4. The terminal device according to claim 1, wherein when information indicating the threshold is not received, the terminal device selects either an SBFD slot or an uplink slot to perform a random access procedure.

5. A communication method used in a terminal device, comprising the steps of: receiving information indicating a threshold; determining whether reception quality is lower than the threshold; and selecting a subband non-overlapping full duplex (SBFD) slot to perform a random access procedure when it is determined that the reception quality is lower than the threshold; and if so, selecting an uplink slot for performing the random access procedure.

Images