WO2025210846A1 - Terminal device, base station device, and wireless communication system - Google Patents

Abstract

This terminal device comprises a reception unit, a control unit, and a transmission unit. The reception unit receives first information constituting a first RO (RACH Occasion) on a resource other than the UL subband and second information constituting a second RO on the UL subband. The control unit transmits a PRACH (Physical Random Access Channel) via either the first RO or the second RO. The control unit determines an RA-RNTI (Random Access-Radio Network Temporary Identifier) on the basis of the RO that has transmitted the PRACH. In addition, the control unit determines whether a received response signal corresponds to the PRACH in accordance with at least one of the RA-RNTI or control information associated with the response signal.

Description

Terminal device, base station device, and wireless communication system

The present invention relates to a terminal device, a base station device, and a wireless communication system.

In today's networks, traffic from mobile devices (smartphones and feature phones) accounts for the majority of network resources. Furthermore, the traffic used by mobile devices is expected to continue to expand. In addition to traffic used by mobile devices, IoT (Internet of Things) services (e.g., transportation systems, smart meters, and monitoring systems for devices) are also being developed. As a result, networks are being required to support services with diverse requirements. In order to accommodate such diverse services, the communication standards for fifth-generation mobile communications (5G or NR (New Radio)) (for example, Non-Patent Documents 1 to 14) have been formulated to support many use cases categorized as eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications) in addition to the standard technologies of 4G (fourth-generation mobile communications).

Incidentally, working groups within the international standardization project, the 3rd Generation Partnership Project (3GPP (registered trademark)), are currently continuing to study and standardize technologies to extend the above communications standards.

For example, a 3GPP working group is considering the introduction of SBFD (Subband Full Duplex) technology (Non-Patent Document 15). This is a technology that improves uplink latency and expands coverage by configuring uplink resources on downlink symbols and/or flexible symbols.

3GPP TS 37.324 V17.0.0 3GPP TS 37.340 V18.0.0 3GPP TS 38.201 V18.0.0 3GPP TS 38.202 V18.1.0 3GPP TS 38.211 V18.1.0 3GPP TS 38.212 V18.1.0 3GPP TS 38.213 V18.1.0 3GPP TS 38.214 V18.1.0 3GPP TS 38.215 V18.1.0 3GPP TS 38.300 V18.0.0 3GPP TS 38.321 V18.0.0 3GPP TS 38.322 V18.0.0 3GPP TS 38.323 V18.0.0 3GPP TS 38.331 V18.0.0 3GPP TR 38.858 V18.0.0

SBFD, for example, configures uplink resources on downlink symbols. The uplink resources may be an uplink subband (UL subband). With the introduction of SBFD, a terminal device can transmit a PRACH (Physical Random Access Channel) using a RACH Occasion (RO) configured on the uplink subband. However, if an RO configured on the UL subband and an RO configured somewhere other than the UL subband are configured, it is expected that the likelihood of random access failure will increase. For example, when deriving the RA-RNTI (Random Access Radio Network Temporary Identifier), a problem may occur where the RA-RNTI derived for an RO on the UL subband is the same as the RA-RNTI derived for an RO other than the UL subband. For example, if the RA-RNTI has the same value, the terminal device may recognize a random access response that is not addressed to the device itself as a random access response addressed to the device itself. As a result, the random access procedure is more likely to fail.

The disclosed technology has been developed in light of the above, and aims to make it possible to improve the success rate of the random access procedure when an RO configured on the UL subband and an RO configured on a location other than the UL subband are configured.

One aspect provides a terminal device comprising: a receiver that receives first information constituting a first RO using resources other than the UL subband and second information constituting a second RO on the UL subband; a transmitter that transmits a PRACH via either the first RO or the second RO; and a controller that determines and calculates an RA-RNTI based on the RO that transmitted the PRACH, wherein the controller determines whether the signal is a response signal to the PRACH in accordance with at least one of the RA-RNTI or control information accompanying the response signal.

It is possible to provide a terminal, base station device, wireless communication system, etc. that can improve the success rate of the random access procedure when an RO configured on the UL subband and an RO configured on a location other than the UL subband are configured.

FIG. 1 is a diagram showing an example of a wireless communication system according to an embodiment. FIG. 2 is a diagram showing an example of a functional configuration diagram of a base station device according to this embodiment. FIG. 3 is a diagram showing an example of a functional configuration diagram of a terminal device according to this embodiment. FIG. 4 is a diagram showing an example of a slot configuration in this embodiment. FIG. 5 is a diagram showing an example of the relationship between the value μ, slots, frames, and subframes in this embodiment. FIG. 6 is a diagram showing an example of a sequence of the wireless communication system 1 according to this embodiment. FIG. 7 is a diagram showing an example of calculating the RA-RNTI in an uplink slot in this embodiment. Figure 8 is a diagram showing an example of a method for configuring a UL subband in this embodiment. FIG. 9 is a sequence diagram of the wireless communication system according to this embodiment. FIG. 10 is a diagram showing an example of mapping SSB to RO on SBFD symbols and RO on Non-SBFD symbols in this embodiment. FIG. 11 is a diagram illustrating an example of the hardware configuration of a base station device according to this embodiment. FIG. 12 is a diagram showing an example of the hardware configuration of a terminal device according to this embodiment.

The present embodiment will be described in detail below with reference to the drawings. The problems and embodiments described in this specification are merely examples and do not limit the scope of the rights of this application. In particular, even if the written expressions are different, as long as they are technically equivalent, the technology of this application can be applied even if the expressions are different, and this does not limit the scope of the rights. Furthermore, each embodiment can be combined as appropriate as long as the processing content is not contradictory.

Furthermore, the terms used and technical content described in this specification may be those described in specifications and contributions as communication standards, such as 3GPP, as appropriate. Examples of such specifications include those described in Non-Patent Documents 1 to 15.

Below, embodiments of the base station device, terminal, and wireless communication system disclosed in this application are described in detail with reference to the drawings. Note that the disclosed technology is not limited to the following embodiments.

First Embodiment

Figure 1 is a diagram showing an example of a wireless communication system in embodiment 1. The wireless communication system may include base station device 100A, base station device 100B, terminal device 200A, terminal device 200B, and terminal device 200C. When terminal device 200A, terminal device 200B, and terminal device 200C are not distinguished from each other, they will simply be referred to as terminal device 200. Base station device 100A forms cell C10. Cell C10 may be referred to as the coverage of base station device 100A. Base station device 100B forms cell C11. Cell C11 may be referred to as the coverage of base station device 100B. When base station device 100A and base station device 100B are not distinguished from each other, they will simply be referred to as base station device 100. The terminal device 200 is located within the coverage area of one of the base station devices 100.

The base station device 100 may be, for example, a small radio base station such as a macro radio base station or a pico radio base station (including a micro radio base station, a femto radio base station, etc.), or a radio base station of various scales, and may be referred to as a radio communication device, a communication device, a transmitting device, etc. Furthermore, the terminal device 200 may be a radio terminal such as a mobile phone, a smartphone, a PDA (Personal Digital Assistant), a personal computer, a vehicle, or any other device or equipment (sensor device, etc.) with radio communication capabilities, and may be referred to as a radio communication device, a communication device, a receiving device, a mobile station, etc.

The base station device 100 is connected to a network device (upper device or other base station device) not shown in the figure via a wired connection. Note that the base station device 100 may also be connected to a network device wirelessly rather than via a wired connection.

The base station device 100 may be configured such that the wireless communication function with the terminal device 200 and the digital signal processing and control functions are separated into separate devices. In this case, the device with the wireless communication function can be called the RRH (Remote Radio Head), and the device with the digital signal processing and control functions can be called the BBU (Base Band Unit). The RRHs may be installed extending from the BBU, and they may be connected by a wired connection such as optical fiber, or they may be connected wirelessly. Instead of the RRH and BBU described above, the base station device 100 may be separated into, for example, a Central Unit (CU), a Distributed Unit (DU), and a Radio Unit (RU). The DU may include, for example, MAC (Media Access Control) layer functions. The DU may also include, for example, RLC (Radio Link Control) layer functionality. The RU includes at least an RF radio circuit. The DU and RU may also be integrated into one unit.

Meanwhile, the terminal device 200 communicates with the base station device 100 via wireless communication.

If an RRC (Radio Resource Control) connection has not been established between the base station device 100 and the terminal device 200, the base station device 100 performs processing to establish an RRC connection. The processing to establish an RRC connection may include a random access procedure.

Next, the base station device 100 will be described. Figure 2 is a diagram showing an example of the functional configuration of the base station device 100 in this embodiment. The base station device 100 has a wireless communication unit 110, a control unit 120, a storage unit 130, and a communication unit 140.

The wireless communication unit 110 is composed of a transmitter 111 and a receiver 112, and performs wireless communication with the terminal device 200. Specifically, the transmitter 111 transmits downlink signals, such as random access procedure signals, downlink physical signals, RRC layer signals, downlink data signals, and downlink control signals, to the terminal device 200.

The receiver 112 can also receive uplink signals transmitted from the terminal device 200, such as random access procedure signals, RRC layer signals, uplink data signals, and uplink control signals.

The control unit 120 controls the base station device 100. Specifically, it can control the establishment of an RRC connection with the terminal device 200, signal processing of signals received by the receiving unit 112, creation of transmission blocks (TB: Transport Block), mapping of transmission blocks to radio resources, etc. The control unit 120 also calculates the transmission power of the downlink channel and/or uplink channel and determines the RNTI (Radio Network Temporary Identifier).

The memory unit 130 can store, for example, downlink data signals.

The communication unit 140 connects to and communicates with network devices (e.g., higher-level devices, other base stations) via wired or wireless connections. Data signals received by the communication unit 140 and intended for the terminal device 200 can be stored in the memory unit 130.

Next, the terminal device 200 will be described. Figure 3 is a diagram showing an example of the functional configuration of the terminal device 200 in this embodiment. As shown in Figure 3, the terminal device 200 comprises a communication unit 210, a control unit 220, and a storage unit 230. These components are connected to enable unidirectional or bidirectional input and output of signals and data. Note that the communication unit 210 can be described as being divided into a transmission unit 211 and a reception unit 212.

The transmitter 211 transmits data signals and control signals wirelessly via an antenna. Note that the antenna may be shared for both transmission and reception. The transmitter 211 transmits uplink signals such as random access procedure signals, RRC layer signals, uplink data signals, and uplink control signals, for example.

The receiver 212 receives downlink signals, such as random access procedure signals, downlink data signals, and downlink control signals, transmitted from the base station device 100. The received signals may also include reference signals used for channel estimation and demodulation, for example.

The control unit 220 controls the terminal device 200. Specifically, the control unit 220 can control the establishment of an RRC connection with the base station device 200, signal processing of signals received by the receiving unit 212, creation of transmission blocks (TBs), mapping of transmission blocks to radio resources, etc. The control unit 220 can also calculate the transmission power of the uplink signal and/or uplink channel and determine the RNTI.

The storage unit 230 can store, for example, uplink data signals. The storage unit 230 can also store configuration information (or setting information) related to wireless communications transmitted from the base station device 100. The configuration information can be, for example, configuration information for SBFD (Subband Full Duplex) or information related to RO (RACH Occasion).

Note that the communication unit 110 of the base station device 100 and the communication unit 210 of the terminal device 200 may be configured to include antenna ports.

The uplink may also be referred to as the uplink. The downlink may also be referred to as the downlink.

The uplink channel may include some or all of the PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), and SRS (Sounding Reference Signal).

The uplink signal may be a signal transmitted via PUSCH, PUCCH, PRACH, and SRS.

The downlink channel may include some or all of the following: PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), PBCH (Physical Broadcast Channel), SSB (Synchronization Signal Block), and CSI (Channel State Information)-RS (Reference Signal).

The downlink signal may be a signal transmitted via the PDSCH, PDCCH, and PBCH. The downlink signal may include a downlink reference signal. The SSB may be an SS (Synchronization Signal)/PBCH block.

The upper layer parameters may be any or all of the following: RRC parameters, MAC CE (Media Access Control Control Element), SIB (System Information Block), and MIB (Master Information Block).

Here, we will explain an example of slots for wireless communication between the base station device 100 and the terminal device 200.

Figure 4 is a diagram showing an example of a slot configuration in this embodiment. The radio frame shown in Figure 4 may be 10 milliseconds (msec). Note that a radio frame may also be called a frame. A radio frame may also be called a system frame. A radio frame may be composed of, for example, 10 subframes.

In the radio frame shown in FIG. 4 , for example, the length of the time axis of the radio frame is determined according to the subcarrier spacing (SCS). For example, the subcarrier spacing is determined according to the relationship SCS = 15 × 2 ^μ (kHz). In other words, μ = 0 means that the subcarrier spacing is 15 kHz. Note that hereinafter, μ may be referred to as the value μ or the value μ that determines the subcarrier spacing.

Note that with a subcarrier spacing of 15 kHz, one frame may include 10 slots. One slot may include, for example, 14 OFDM symbols. An OFDM symbol is composed of, for example, multiple physical resource blocks (PRBs: Physical Resource Blocks). One physical resource block may be composed of, for example, 12 subcarriers.

Note that slots are numbered as n _s ^μ using subcarrier spacing μ, for example. _{n s} ^μ is numbered in ascending order within the range of {0, 1, 2, ..., N _slot ^{subframe, μ} -1} in one subframe, for example. _{n s} ^μ is numbered in ascending order within the range of {0, 1, 2, ..., N _slot ^{frame, μ} -1} in one frame, for example. One slot may include N _symb ^slot OFDM symbols. The value of _{N symb} ^slot may vary depending on the length of the cyclic prefix (CP).

FIG. 5 is a diagram showing an example of the relationship between the value μ, slots, frames, and subframes in this embodiment. Note that a normal CP may be employed for all values μ. Furthermore, an extended CP may be employed when μ = 2. Regarding the CP length in the time domain, the normal CP may be shorter than the extended CP. Furthermore, FIG. 5 shows an example of the number of slots N _slot ^{frame included in one radio frame for the value μ,} and the number of slots included in one subframe for the value μ. In the case of a normal CP, for example, one slot includes 14 OFDM symbols. In the case of an extended CP, for example, one slot includes 12 OFDM symbols. In the first embodiment, a normal CP is assumed unless otherwise specified. Note that the technology in the first embodiment is applicable to both a normal CP and an extended CP.

Note that the value μ is a value used to determine the subcarrier spacing, as described above. Note that the subcarrier spacing may also be referred to as numerology. Different numerologies may also mean different subcarrier spacings.

A time resource may be one or more OFDM symbols. A time resource may be one or more slots. A time resource may be one or more system frames.

A frequency resource may be one or more subcarriers. A frequency resource may be one or more PRBs.

An antenna port may be defined such that the channel on which a symbol is transmitted on a given antenna port can infer the channel on which a different symbol is transmitted on that antenna port. In other words, multiple symbols transmitted on the same antenna port at different times can be considered to have been transmitted on the same channel.

If the long-scale property of a channel on which a symbol is transmitted on one antenna port can be used to predict the channel on which a different symbol is transmitted on the other antenna port, the two antenna ports may be said to be Quasi Co-located (QCL). The long-scale property may include some or all of one or more of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial reception parameters.

For each numerology and carrier, a resource grid may be defined with N _grid,x ^size,μ ×N _sc ^RB subcarriers and N _symb ^subframe,μ OFDM symbols, where _{N sc} ^RBs may be 12.

FR1 (Frequency Range 1) may have a carrier frequency of 6 GHz or less. FR2 may have a carrier frequency of 6 GHz or more.

TDD (Time Division Duplex) may also be called Unpaired Spectrum.

The Random Access Preamble Sequence supports four or more different lengths. The four or more different lengths may include at least 139, 571, 839, and 1151.

A random access preamble sequence of length 839 may be applied to an SCS of 1.25 kHz and/or 5 kHz. A random access preamble sequence of length 139 may be applied to an SCS of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 480 kHz, and 960 kHz. A random access preamble sequence of length 571 may be applied to an SCS of 30 kHz, 120 kHz, and/or 480 kHz. A random access preamble sequence of length 1151 may be applied to an SCS of 15 kHz and/or 120 kHz.

Next, TDD (Time Division Duplex) will be explained. In TDD, the base station device 100 may determine the slot format. In TDD, the base station device 100 may transmit slot format configuration information to the terminal device 200. The terminal device 200 may determine the slot format based on the slot format configuration information. The base station device 100 may know the slot format of the terminal device 200 in the cell included in the base station device 100. The slot format configuration information may be one or more higher layer parameters, or one or more physical layer signals.

When slot format configuration information tdd-UL-DL-ConfigurationCommon is provided to the terminal device 200, the terminal device 200 sets the slot format for each of multiple slots in accordance with the instructions of the slot format configuration information. Setting the slot format may also mean determining the slot format. The slot format configuration information tdd-UL-DL-ConfigurationCommon may be an upper layer parameter.

The slot format configuration information tdd-UL-DL-ConfigurationCommon provides a reference SCS μ _ref (reference SCS Configuration) and pattern 1. μ _ref may be an integer equal to or greater than 0. Pattern 1 may provide a parameter dl-UL-TransmissionPeriodicity that sets a slot configuration period P milliseconds (msec), a parameter nrofDownlinkSlots that sets the number of downlink slots d _slots , a parameter nrofDownlinkSymbols that sets the number of downlink symbols d _sym , a parameter nrofUplinkSlots that sets the number of uplink slots u _slots , and a parameter nrofUplinkSymbols that sets the number of uplink symbols u _sym . A millisecond is one thousandth of a second.

The slot configuration period P milliseconds includes S=P×2 ^μref slots when the SCS is ^μref . For example, if P is 2.5 and _μref is 1, 5 slots (i.e., S=5) may be included in 2.5 milliseconds. Of the S slots, the first d _slots may be downlink slots only. Also, the last u _slots may be uplink slots only. Here, the first d _slots may be earlier slots in time sequence among the S _{slots. The last u slots may} be later slots in time sequence. That is, the first d slots may be earlier in time sequence than the last u _slots . The d _sym symbols after the first d _slots may be downlink symbols. The u _sym symbols before the last u _slots slots may be uplink symbols. In the S slots, the f _sym symbols may be flexible symbols, where f _sym = (S - d _slots - u _slots ) × N _Symb ^slot - _{d sym} - u _sym . That is, in the S slots, the order may be d _slots , d _sym , f _sym , u _sym , u _slots in chronological order.

The downlink slot may contain a downlink symbol. The uplink slot may contain an uplink symbol. The first symbol of each 20/P period may be the first symbol of an even frame.

If the slot format configuration information tdd-UL-DL-ConfigurationCommon provides pattern 1 and pattern 2, the terminal device 200 may set a slot format for each slot on a first number of slots indicated by pattern 1, and may set a slot format for each slot on a second number of slots indicated by pattern 2.

Pattern 2 may provide a parameter dl-UL-TransmissionPeriodicity that sets the slot configuration period P _{to 2} milliseconds (msec), the number of downlink slots d _{slots, a parameter nrofDownlinkSlots that sets 2} , the number of downlink symbols d _{sym, a parameter nrofDownlinkSymbols that sets 2} , the number of uplink slots u _{slots, a parameter nrofUplinkSlots that sets 2} , the number of uplink symbols u _{sym, and a parameter nrofUplinkSymbols that sets 2} .

The slot configuration period P+P ₂ milliseconds may include, in time sequence, S = P × 2 ^μref slots followed by S ₂ = P ₂ × 2 ^μref slots where the SCS is ^μref . Of the S ₂ slots, the first d _{slots and two} slots may be downlink slots only. Also, the last u _{slots and two} slots may be uplink slots only. Here, the first d _{slots and two} slots may be earlier slots in time sequence among the S slots. The last u _{slots and two} slots may be later slots in time sequence. That is, the first d _{slots and two} slots may be earlier in time sequence than the last u _{slots and two} slots. The d _{sym and two symbols after the first d slots and} two slots may be downlink symbols. The two symbols u _sym before the last u _{slots (two} slots) may be uplink symbols. In the S ₂ slots, the two symbols f sym may be flexible symbols. Here, f _{sym ,2} = (S ₂ - d _slots,2 - u _slots,2 ) x N _Symb ^slot - d _sym,2 - u _sym,2 . That is, the S ₂
The slots may be arranged in chronological order as follows: d _{slots,2 1} , d _{sym,2 1} , f _{sym,2 1} , u _{sym,2 1} , u _{slots,2 1} .

In the downlink slots and/or downlink symbols, the terminal device 200 may receive a downlink channel and/or a downlink signal. For example, the terminal device 200 may receive a PDSCH, a PDCCH, a PBCH, a CSI-RS, or an SSB in the downlink slots and/or downlink symbols. In the uplink slots and/or uplink symbols, the terminal device 200 may receive an uplink channel and/or an uplink signal. For example, the terminal device 200 may transmit a PUSCH, a PUCCH, a PRACH, or an SRS in the uplink slots and/or uplink symbols. In the flexible slots and/or flexible symbols, the terminal device 200 may receive a downlink channel or a downlink signal scheduled in a DCI format. In the flexible slots and/or flexible symbols, the terminal device 200 may transmit an uplink channel or an uplink signal scheduled in a DCI format. The terminal device 200 may transmit the PRACH in flexible slots and/or flexible symbols.

If the terminal device 200 is not configured to monitor the PDCCH of DCI format 2_0 in a set of slot symbols indicated as flexible by tdd-UL-DL-ConfigurationCommon and/or tdd-UL-DL-ConfigurationDedicated, or if tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated are not provided to the terminal device 200, the terminal device 200 may receive PDSCH or CSI-RS in the set of slot symbols if the terminal device 200 receives a corresponding instruction in the DCI format.

If the terminal device 200 is not configured to monitor the PDCCH of DCI format 2_0 in a set of symbols of a slot indicated as flexible by tdd-UL-DL-ConfigurationCommon and/or tdd-UL-DL-ConfigurationDedicated, or if tdd-UL-DL-ConfigurationCommon and tdd-UL-DL-ConfigurationDedicated are not provided to the terminal device 200,
If the terminal device 200 receives a corresponding indication in a DCI format, or an RAR UL grant, a fallbackRAR UL grant, or a successRAR, the terminal device 200 may transmit a PUSCH, a PUCCH, a PRACH, or an SRS in a set of symbols of the slot.

A terminal device 200 configured to operate in the BWP (Bandwidth Part) of a serving cell may have a set of up to four BWPs configured by the upper layer of the serving cell. The set of BWPs may include an uplink BWP (UL BWP) and a downlink BWP (DL BWP). The DL BWP may be used by the terminal device 200 for reception in the downlink bandwidth. The DL BWP may be configured based on the upper layer parameter BWP-Downlink, or may be configured based on the upper layer parameter initialDownlinkBWP using a parameter set configured by the upper layer parameter BWP-DownlinkCommon and the upper layer parameter BWP-DownlinkDedicated. The UL BWP may be used by the terminal device 200 for transmission in the uplink bandwidth. The UL BWP may be configured based on the upper layer parameter BWP-Uplink, or may be configured based on the upper layer parameter initialUplinkBWP using a set of parameters configured by the upper layer parameter BWP-UplinkCommon and the upper layer parameter BWP-UplinkDedicated.

If the upper layer parameter initialDownlinkBWP is not provided to the terminal device 200, the initial DL BWP may be set by the position and number of consecutive PRBs starting from the PRB with the lowest index among the PRBs in the CORESET (Control Resource Set) for the Type0-PDCCH CSS set and ending with the PRB with the highest index. If the upper layer parameter initialDownlinkBWP is not provided to the terminal device 200, the bandwidth of the initial DL BWP may be the same as the bandwidth of the CORESET in which the Type0-PDCCH CSS set is configured. If the terminal device 200 is not provided with the upper layer parameter initialDownlinkBWP, the SCS of the Initial DL BWP and the Cyclic Prefix for PDCCH reception may be the same as the SCS and Cyclic Prefix of the CORESET in which the Type0-PDCCH CSS set is configured. If the terminal device 200 is provided with the upper layer parameter initialDownlinkBWP, the Initial DL BWP may be provided by the upper layer parameter initialDownlinkBWP. In the case of operation in a primary cell or secondary cell, the terminal device 200 may be provided with an Initial UL BWP by the InitialUplinkBWP. When a Supplementary UL Carrier is configured in the terminal device 200, the terminal device 200 may be provided with an Initial UL BWP on the Supplementary UL Carrier by the InitialUplinkBWP.

The terminal device 200 may transmit an uplink channel and/or an uplink signal in a UL BWP. The terminal device 200 may receive a downlink channel and/or a downlink signal in a DL BWP.

The flow of signals between the base station device 100 and the terminal device 200 in embodiment 1 will be described using Figure 6. Figure 6 is a diagram showing an example of a sequence in the wireless communication system 1 in embodiment 1. In the sequence diagram shown in Figure 6, steps S20 to S50 may be referred to as a random access procedure. Note that while Figure 6 uses a contention-based four-step random access procedure for explanation, this is not limiting. For example, it can also be applied to a non-contention-based random access procedure or a two-step random access procedure. The four-step random access procedure may also be referred to as a type 1 random access procedure.

The base station device 100 transmits a first signal including information related to the random access procedure (step S10). The first signal is transmitted, for example, as an RRC layer signal or in System Information Block 1 (SIB1). The information related to the random access procedure is an example of the first information.

Information related to the random access procedure may include, for example, information indicating the frequency resources and/or time resources in which the PRACH Occasion is configured. Note that the PRACH Occasion corresponds, for example, to a resource from which the PRACH can be transmitted. The PRACH Occasion may also be a valid resource from which the PRACH can be transmitted. The PRACH Occasion indicates an area from which the PRACH can be transmitted. The PRACH Occasion may have a different configuration depending on the PRACH format. The PRACH Occasion may also be referred to as RO (RACH Occasion). The PRACH Occasion is an example of a resource for random access. The PRACH format may also be a PRACH preamble format.

A PRACH preamble format may be defined with one or more PRACH OFDM symbols and different CPs (Cyclic Prefixes) and guard times. The PRACH preamble configuration may be provided to the terminal device 200 in system information.

The terminal device 200 may be provided with the number N _SSB of SS/PBCH blocks associated with one RO and the number R of contention-based preambles per SS/PBCH block for each valid RO by ssb-perRACH-OccasionAndCBPreamblesPerSSB. If N _SSB < 1, one SS/PBCH block is mapped to 1/N _SSB consecutive valid ROs, and the indices of the R contention-based preambles with consecutive indices associated with SS/PBCH blocks for each valid RO may start from 0. If N _SSB >= 1, the indices of the R contention-based preambles with consecutive indices associated with SS/PBCH block n may start from n×N _preamble ^total /N for each valid RO. Here, N _preamble ^total may be given by totalNumberOfRA-Preambles. Also, N _preamble ^total may be a multiple of N _SSB , where n may be 0 or greater, or may be N _SSB −1 or less.

The SS/PBCH block indices provided by ssb-PositionsInBurst included in SIB1 or ServingCellConfigCommon may be mapped to valid ROs in the following order: First, in ascending order of preamble indices within one RO. Second, in ascending order of frequency resource indices of frequency-multiplexed ROs. Third, in ascending order of time resource indices of PRACHs time-multiplexed within a PRACH slot. Fourth, in ascending order of PRACH slot indices.

For example, if it is determined based on the information on multiple resources to be used for transmitting the PRACH that the PRACH should be transmitted using one resource, the transmitter 211 of the terminal device 200 transmits one PRACH. For example, if it is determined based on the information on multiple resources to be used for transmitting the PRACH that the PRACH should be transmitted using two resources, the transmitter 211 of the terminal device 200 transmits two PRACHs. Furthermore, for example, if it is determined based on the information on multiple resources to be used for transmitting the PRACH that the PRACH should be transmitted using four resources, the transmitter 211 of the terminal device 200 transmits four PRACHs.

Furthermore, the information regarding the random access procedure may include, for example, one or all of configuration information for PRACH transmission, a preamble index (Preamble Index), preamble subcarrier spacing, PRACH transmission power P _PRACH,target , RA-RNTI, PRACH resources, and a random access preamble sequence (Random Access Preamble Sequence). Note that the PRACH is transmitted from the transmitter 211 of the terminal device 200, for example, on a designated PRACH resource using a selected PRACH format at PRACH transmission power P _PRACH,target . In addition, the RA-RNTI may be an RNTI that is scrambled in a PDCCH that schedules a random access response (RAR) to the transmission of a PRACH.

Furthermore, configuration information for PRACH transmission may correspond to, for example, information regarding multiple resources for transmitting PRACH multiple times, or information corresponding to bundling.

Furthermore, the first signal includes, for example, information that allows the terminal device 200 to determine the relationship between SSB and RACH resources. The RSRP threshold used to select an SSB to associate with a RACH resource is set, for example, by the base station device 100.

Returning to the explanation of Figure 6, the random access procedure is triggered, for example, by a PRACH transmission request from a higher layer and/or a PDCCH order. The random access procedure may also be triggered after the terminal device 200 completes a cell search procedure.

When the random access procedure is triggered, the control unit 220 of the terminal device 200 selects a random access preamble from among the random access preamble candidates. Note that the random access procedure is triggered, for example, by a PRACH transmission request from a higher layer and/or a PDCCH order.

In the contention-based random access procedure, the terminal device 200 is provided with, for example, a predetermined number (N _ssbindex ) of SS/PBCH block indices (SS/PBCH Block index) associated with one PRACH Occasion (Associated) and R contention-based preambles (Contention-based preambles) via a first signal. The selected random access preamble is selected from the R contention-based preambles.

The transmitting unit 211 of the terminal device 200 transmits a first number of random access preambles according to the information related to the random access procedure (step S20). The random access preamble may be referred to as message 1 or message 1 of the random access procedure. The random access preamble may be transmitted via the PRACH.

When the receiver 112 receives at least a portion of the first number of random access preambles (step S20), the transmitter 111 of the base station device 100 transmits a random access response to the terminal device 200 (step S30). The random access response can be referred to as message 2 of the random access procedure or message 2 (Msg2). Msg2 may be scheduled by a PDCCH in which the RA-RNTI is scrambled. The terminal device 200 may detect and/or receive the PDCCH by configuring the CORESET and search space. Msg2 may include scheduling information for message 3 (MSG3) transmitted by the terminal device 200, as described below.

Note that the base station device 100 calculates the RA-RNTI corresponding to the PRACH Occasion, for example, in accordance with one of the first number of random access preambles transmitted by the terminal device 200. For example, the RA-RNTI is calculated using the following formula 1.

(Formula 1)

Here, for example, s _id may be the index of the first OFDM symbol of a PRACH Occasion used for PRACH transmission and corresponding to each of the first number of random access preambles. s _id may be a value greater than or equal to 0 and less than 14. For example, t _id may be the index of the first slot in the system frame that includes a PRACH Occasion corresponding to each of the first number of random access preamble transmissions. For example, t _id may be a value greater than or equal to 0 and less than 80. For example, f _id may be an index of a PRACH Occasion in the frequency domain. For example, f _id may be a value greater than _or equal to 0 and less than 8. For example, ul_carrier_id may be an uplink carrier used for random access preamble transmission. Also, for example, ul_carrier_id may be either a value of 0 or 1.

Note that the s _id and t _id may correspond to the last OFDM of the PRACH occasion to which each of the first number of random access preambles corresponds.

In short, the _{s_id} and _{t_id} may be values that are set in accordance with the first number of random access preambles.

When the receiver 212 of the transmitter 211 of the terminal device 200 receives the random access response (step S30), the transmitter 211 also responds by transmitting a scheduled transmission to the base station device 100 (step S40). The scheduled transmission can be referred to as message 3 (Msg3) of the random access procedure.

When the receiver 112 of the base station device 100 receives the scheduled transmission (step S40), the transmitter 111 transmits a contention resolution to the terminal device 200 (step S50). Note that the contention resolution can also be referred to as message 4 or message 4 of the random access procedure.

Fig. 7 is a diagram showing an example of calculating the RA-RNTI in an uplink slot in this embodiment. For a subcarrier spacing μ, the number of slots included in one system frame when calculating the RA-RNTI may be N _slot ^{frame μ} shown in Fig. 5. When μ is 3 or greater, the number of slots used when calculating the RA-RNTI may be 80. Fig. 7 shows an example in which the number of slots included in one system frame is 80. Furthermore, Fig. 7 assumes that the RO has two FDMs and a duration of 6 symbols is configured from the first OFDM symbol according to higher layer parameters. When ul_carrier_id is 0, if the terminal device 200 transmits the PRACH in an RO with f_id of 0 configured in the 25th slot, the RA-RNTI may be 1+0+14×24+14×80×0+14×80×8×0=337 according to Equation 1. When ul_carrier_id is 0, if the terminal device 200 transmits the PRACH in an RO with f_id of 1 configured in the 25th slot, the RA-RNTI may be 1+0+14×24+14×80×1+14×80×8×0=1457 according to Equation 1.

Next, we will explain SBFD (Subband Full Duplex). SBFD allows transmission and reception to occur simultaneously at the same time (Same Time Instance) in the base station device 100. For example, a base station device 100 that supports SBFD can transmit PDSCH and receive PUSCH simultaneously in the same slot. When SBFD is configured in a certain terminal device 200, the terminal device 200 does not need to transmit uplink and receive downlink simultaneously. For example, a terminal device 200 configured with SBFD will not transmit PUSCH and PDSCH simultaneously at the same time.

When SBFD is configured in the terminal device 200, SBFD may be configured in one or more component carriers (CCs).

SBFD may involve allocating some or all of the frequency resources configurable on a downlink symbol to the uplink. SBFD may involve allocating some or all of the frequency resources configurable on a flexible symbol to the uplink. The downlink symbol, or the frequency resources allocated to the uplink, which are some or all of the frequency resources configurable on the flexible symbol, may be referred to as the UL subband. The UL subband may be the uplink subband. The UL subband may be an uplink subband. The terminal device 200 may transmit an uplink channel or an uplink signal on the UL subband. For example, the terminal device 200 may transmit a PUCCH on the UL subband. For example, the terminal device 200 may transmit a PUSCH on the UL subband. For example, the terminal device 200 may transmit a PRACH on the UL subband. For example, the terminal device 200 may transmit an SRS on the UL subband.

The SBFD symbol may be a symbol in which a UL subband is configured. The SBFD symbol may be a slot containing a symbol in which a UL subband is configured.

The base station device 100 may provide UL subband configuration information to the terminal device 200. The UL subband configuration information may include some or all of the starting PRB index of the UL subband, the bandwidth of the UL subband, the symbol index in which the UL subband is configured, and the slot index in which the UL subband is configured.

The period of the SBFD symbol configuration in the time domain may be the same as the period P included in the slot format configuration information. When pattern 2 is provided to the terminal device 200, the period of the SBFD symbol configuration in the time domain may be the same as the sum of the period P and period _P2 included in the slot format configuration information. Within the period of the SBFD symbol configuration in the time domain, the base station device 100 may provide information on the time resources in which the SBFD symbols are configured to the terminal device 200 using the upper layer parameter SBFDTimeResourceIndication. The base station device 100 may provide information on the time resources in which the SBFD symbols are configured to the terminal device 200 using DCI. The terminal device 200 may configure the SBFD symbols based on the information on the time resources in which the SBFD symbols are configured.

FIG. 8 shows an example of a method for configuring a UL subband in this embodiment. The period 801 may be a period indicated by the upper layer parameter dl-UL-TransmissionPeriodicity. For example, the period 801 is P milliseconds. For example, the period 801 is P + P ₂ milliseconds. For example, the period 801 is P ₂ milliseconds. The period 801 may include a downlink slot 802, a downlink slot 803, a downlink slot 804, a flexible slot 805, and an uplink slot 806. The base station device 100 may provide the terminal device 200 with start timing 810 and end timing 811 of the UL subband 800 in the time domain. The start timing 810 may be the first symbol included in slot 803. The start timing 810 may be any symbol included in slot 803. The end timing 811 may be the last symbol included in slot 805. The end timing 811 may be any symbol included in slot 805. The symbol included in slot 803 overlapping with UL subband 800, the symbol included in slot 804 overlapping with UL subband 800, and the symbol included in slot 805 overlapping with UL subband 800 may be an SBFD symbol.

Bandwidth 808 is the bandwidth of UL subband 800. The sum of bandwidth 807, bandwidth 808, and bandwidth 809 may be the bandwidth of the DL BWP. In the SBFD symbol, the bandwidth corresponding to bandwidth 807 may be the DL subband. In the SBFD symbol, the bandwidth corresponding to bandwidth 809 may be the DL subband. The DL subband may include a guard band.

Here, we will explain the flow up to when a terminal with SBFD set transmits data in embodiment 1. Figure 9 explains a sequence diagram of wireless communication system 1 in this embodiment.

The transmitter 111 of the base station device 100 transmits a first signal including first information regarding the SBFD configuration and second information regarding the uplink channel configuration to the terminal device 200 (step S60). Note that the first information regarding the SBFD configuration may also be referred to as first information configuring the UL subband. The first information and second information may also be transmitted in separate signals. Note that the first signal may be, for example, a signal of an upper layer or a signal of the RRC layer. The second information regarding the uplink channel configuration may also be, for example, information regarding the configuration of an uplink control channel or information regarding the configuration of a random access channel.

The control unit 220 of the terminal device 200 performs a first process of configuring SBFD in accordance with information related to the SBFD configuration (step S70). When configuring SBFD, the control unit 220 of the terminal device 200 adjusts the uplink resources so that they are located on the uplink subband, for example, using an offset value. Details of the offset value will be described later.

The transmitter 211 of the terminal device 200 transmits an uplink signal on the uplink subband set by the first process (step S80).

In FIG. 9, a signal indicating completion may be transmitted after the SBFD configuration is complete. Furthermore, if the uplink signal transmitted in step S80 contains data, the receiver 212 of the terminal device 200 may receive a reception confirmation response to the uplink signal. Furthermore, before transmission in step S80, a downlink signal may be received, and a response signal to the downlink signal (for example, a PUCCH containing information related to HARQ) may be transmitted as the third signal.

Note that step S60 in Figure 9 corresponds to, for example, step S10 in Figure 6, and the information transmitted in steps S60 and S10 may be combined and transmitted in the first signal.

Furthermore, step S70 in FIG. 9 corresponds, for example, to the processing performed after receiving step S10 in FIG. 6. Furthermore, step S80 in FIG. 9 corresponds, for example, to step S30 in FIG. 6.

Next, a method for controlling the position of an RO (RACH Occasion) will be described. In this example, the first signal transmitted in step S60 of FIG. 9 is, for example, an upper layer signal such as SIB1, and includes various upper layer parameters. The first process performed in step S70 of FIG. 9 is a process for adjusting the RO so that it is located on the UL subband. The second signal transmitted in step S80 of FIG. 9 is, for example, a random access signal (e.g., MSGA (Message A) or MSG1 (Message 1)). If the RO is configured on a UL symbol that is not an SBFD symbol, the frequency domain position of the RO may be determined by the upper layer parameter msg1-FrequencyStart. The upper layer parameter msg1-FrequencyStart may be an offset from the starting PRB index of the UL BWP. When the RO is configured on a UL subband included in the SBFD symbol, the frequency domain position of the RO may be determined by the upper layer parameter msg1-FrequencyStart and the upper layer parameter msg1-SBFDFrequenceStart. The upper layer parameter msg1-SBFDFrequenceStart may be an offset from the starting PRB index of the UL BWP. The upper layer parameter msg1-SBFDFrequenceStart may be an offset from the PRB index determined by the upper layer parameter msg1-FrequencyStart.

Next, in a flexible symbol and/or flexible slot, if the terminal device 200 has configuration information for uplink transmission in an SBFD symbol and configuration information for uplink signals in symbols that are not SBFD symbols (non-SBFD symbols), the terminal device 200 may apply only the configuration information for uplink transmission in the SBFD symbol. The configuration information for uplink transmission may be information carried in higher layer parameters and/or DCI for transmission of an uplink channel and/or uplink signals.

In flexible symbols and/or flexible slots, if the terminal device 200 has both configuration information for uplink transmission in SBFD symbols and configuration information for uplink signals in symbols that are not SBFD symbols (non-SBFD symbols), the terminal device 200 may apply only the configuration information for uplink transmission in symbols that are not SBFD symbols.

In flexible symbols and/or flexible slots, if the terminal device 200 has configuration information for uplink transmission in SBFD symbols and configuration information for uplink signals in symbols that are not SBFD symbols (non-SBFD symbols), the terminal device 200 may apply the configuration information for uplink transmission in SBFD symbols and the configuration information for uplink transmission in symbols that are not SBFD symbols.

Next, in a flexible symbol and/or flexible slot, if the terminal device 200 has configuration information for downlink transmission in an SBFD symbol and configuration information for downlink signals in symbols that are not SBFD symbols (non-SBFD symbols), the terminal device 200 may apply only the configuration information for downlink transmission in the SBFD symbol. The configuration information for downlink transmission may be information carried in higher layer parameters and/or DCI for transmission of a downlink channel and/or downlink signals.

In flexible symbols and/or flexible slots, if the terminal device 200 has both downlink transmission configuration information for SBFD symbols and downlink signal configuration information for symbols that are not SBFD symbols (non-SBFD symbols), the terminal device 200 may apply only the downlink transmission configuration information for symbols that are not SBFD symbols.

In flexible symbols and/or flexible slots, if the terminal device 200 has configuration information for downlink transmission in SBFD symbols and configuration information for downlink signals in symbols that are not SBFD symbols (non-SBFD symbols), the terminal device 200 may apply the configuration information for downlink transmission in SBFD symbols and the configuration information for downlink transmission in symbols that are not SBFD symbols.

Here, we will explain in detail the issues regarding RA-RNTI in relation to RO on SBFD symbols and RO on Non-SBFD symbols. In the explanation, terminal device 200A will be explained as a terminal device 200 in which SBFD is not configured, and terminal device 200B will be explained as a terminal device 200 in which SBFD is configured. A terminal device 200 in which SBFD is not configured is, for example, a terminal device 200 that does not have a function compatible with SBFD. In short, a terminal device 200 in which SBFD is not configured and a terminal device 200 in which SBFD is configured can be described as terminals with different UE capabilities.

The terminal device 200A may receive second information regarding the configuration of a random access channel, which is information for configuring an RO on a non-SBFD symbol, and may configure an RO using the second information. The terminal device 200B may receive second information regarding the configuration of a random access channel, which is information for configuring an RO on a non-SBFD symbol, and may configure an RO using the second information. Furthermore, the terminal device 200B may receive third information regarding the configuration of a random access channel, which is information for configuring an RO on an SBFD symbol, and may configure an RO using the third information. The terminal device 200A may map an SSB to an RO configured using the second information. The terminal device 200B may map an SSB to an RO configured using the third information. Note that the RO configured on a non-SBFD symbol is an example of a first RO. Furthermore, the RO configured on an SBFD symbol is an example of a second RO.

Figure 10 shows an example of mapping SSB to an RO on an SBFD symbol and an RO on a non-SBFD symbol in this embodiment. In Figure 10, there is one RO frequency-multiplexed to terminal device 200A according to upper layer parameters, and one RO frequency-multiplexed to terminal device 200B. Note that RO1001 may be configured in terminal device 200A, and RO1002 may be configured in terminal device 200B. Here, RO1002 may be an RO configured on the UL subband. Terminal device 200A may not be able to recognize that RO1002 has been configured. Terminal device 200B may or may not be able to recognize that RO1001 has been configured. Furthermore, terminal device 200A may not be able to recognize that UL subband 1000 has been configured. Terminal device 200B may be able to recognize that UL subband 1000 has been configured. RO 1001 may be configured by second information regarding the configuration of the random access channel. RO 1002 may be configured by third information regarding the configuration of the random access channel.

Since an RO is configured with independent parameters in each terminal device, an f_id may be assigned to an RO that can be recognized by each terminal device in ascending order of frequency. That is, the f_id of RO 1001 in terminal device 200A may be 0. The f_id of RO 1002 in terminal device 200B may also be 0. An index may be assigned to the f_id for each piece of configuration information that configures the RO. An index may be assigned to the f_id for each piece of information related to the configuration of the random access channel. An independent index may be assigned to each RO configured by second information related to the configuration of the random access channel and third information related to the configuration of the random access channel.

When terminal device 200A transmits a PRACH on RO 1001 and ul_carrier_id is 0, for example, RA-RNTI is calculated as follows according to formula 1: 1 + 0 + 14 x 58 + 14 x 80 x 0 + 14 x 80 x 8 x 0 = 813. Also, as shown in FIG. 7, when ul_carrier_id is 0 and terminal device 200A transmits a PRACH on an RO with f_id of 1 configured in the 25th slot (t_id = 24), for example, RA-RNTI is calculated as follows according to formula 1: 1 + 0 + 14 x 24 + 14 x 80 x 1 + 14 x 80 x 8 x 0 = 1457.

When terminal device 200B transmits a PRACH on RO 1002 and ul_carrier_id is 0, for example, RA-RNTI is calculated as follows according to formula 1: 1 + 0 + 14 x 58 + 14 x 80 x 0 + 14 x 80 x 8 x 0 = 813. Also, as shown in FIG. 7, when ul_carrier_id is 0 and terminal device 200B transmits a PRACH on an RO with f_id of 1 configured in the 25th slot (t_id = 24), for example, RA-RNTI is calculated as follows according to formula 1: 1 + 0 + 14 x 24 + 14 x 80 x 1 + 14 x 80 x 8 x 0 = 1457.

As shown in the example in Figure 10, the RA-RNTI corresponding to each PRACH transmitted in an RO on the UL subband and an RO other than the UL subband may have the same value. If terminal device 200B, which transmitted a PRACH in an RO on the UL subband, and terminal device 200A, which transmitted a PRACH in an RO other than the UL subband, have the same RA-RNTI, the PDCCH scheduling the RAR may be scrambled with that RA-RNTI, and terminal device 200A and/or terminal device 200B may receive the same RAR. When base station device 100 transmits an RAR for terminal device 200B and terminal device 200A receives that RAR, a problem occurs in which terminal device 200A attempts to transmit Msg3 scheduled by the RAR on the downlink symbol. When base station device 100 transmits an RAR for terminal device 200A and terminal device 200B receives that RAR, terminal device 200B transmits Msg3 in an uplink symbol for which no UL subband is configured. However, since the base station device 100 that receives this Msg3 does not receive the Msg3 from terminal device 200A that was originally scheduled, the random access procedure may fail.

The following describes, for example, a method for the random access procedure when using RO configured on the UL subband to reduce the possibility of failure of the random access procedure. By using the following five examples, the terminal device 200 can determine whether Msg2 is addressed to the device itself.

(First example)
When calculating the RA-RNTI, the terminal device 200B transmitting the PRACH via RO on the UL subband may set the ul_carrier_id to an integer other than 0 or 1. For example, when calculating the RA-RNTI, the terminal device 200B transmitting the PRACH via RO on the UL subband may set the ul_carrier_id to 2. In the example of Fig. 10, when the terminal device 200B transmits the PRACH on RO 1002 and sets ul_carrier_id to 2, the RA-RNTI is, for example, 1 + 0 + 14 x 58 + 14 x 80 x 0 + 14 x 80 x 8 x 2 = 18733 according to Equation 1. Also, in the example of Figure 7, when ul_carrier_id is 0 and the terminal device 200B transmits a PRACH with an RO having an f_id of 1 configured in the 25th slot, the RA-RNTI is, for example, 1 + 0 + 14 x 24 + 14 x 80 x 1 + 14 x 80 x 8 x 0 = 19377 according to equation 1.

In short, in the first example, by setting an integer on the SBFD symbol to ul_carrier_id, the RA-RNTI corresponding to each PRACH transmitted in an RO on the UL subband and an RO other than the UL subband is less likely to have the same value. This reduces the possibility of the random access procedure failing.

(Second Example)
The terminal device 200B, which transmits a PRACH via an RO on the UL subband, may apply an f_id allocation method different from that of the terminal device 200A. The initial value of f_id in the terminal device 200B may be a value obtained by adding 1 to the maximum value of f_id configured in the terminal device 200A. For example, when two ROs are frequency-multiplexed in the terminal device 200A and three ROs are frequency-multiplexed in the terminal device 200B, the f_id of the terminal device 200A may be 0 or 1, and the f_id of the terminal device 200B may start from 2, which is the value obtained by adding 1 to the maximum value of f_id of the terminal device 200A, that is, 1. In other words, when the f_id of the terminal device 200A is 0 or 1, the f_id of the terminal device 200B may be 2, 3, or 4. In the example of Figure 10, if the f_id of RO1001 configured in terminal device 200A is 0, the f_id of RO1002 configured in terminal device 200B may be 1, which is the maximum value of the f_id of the RO configured in terminal device 200A plus 1.

In short, in the second example, by setting a value for f_id ( _{f_id} in Equation 1) that is equal to or greater than the maximum value of ROs other than the UL subband, as the RO on the UL subband, the RA-RNTIs corresponding to the PRACHs transmitted in the RO on the UL subband and the ROs other than the UL subband are less likely to have the same value, thereby reducing the possibility of failure of the random access procedure.

(Third Example)
In one or more OFDM symbols in which an RO configured in the terminal device 200A exists, the terminal device 200B may not set an RO in the OFDM symbol. In one or more OFDM symbols in which an RO configured in the terminal device 200A exists, the terminal device 200B may set an RO configured in the OFDM symbol by the third information to an invalid RO.

In short, in the third example, the terminal device 200B controls the time axis so that ROs other than those in the UL subband do not overlap with ROs on the UL subband. This reduces the possibility of failure of the random access procedure.

(Fourth Example)
The base station device 100 may configure a first CORESET and a first search space including a PDCCH to be transmitted to the terminal device 200A, and a second CORESET and a second search space including a PDCCH to be transmitted to the terminal device 200B. The terminal device 200A may receive a PDCCH for scheduling Msg2 using the first CORESET and the first search space. The terminal device 200B may receive a PDCCH for scheduling Msg2 using the second CORESET and the second search space. The first CORESET and the second CORESET may have different periods and/or resources. The first search space and the second search space may have different periods and/or resources.

In short, in the fourth example, different CORESETs are set in terminal device 200A and terminal device 200B. By doing so, for example, terminal device 200A will not be able to receive and process Msg2 transmitted from base station device 100 in response to the PRACH transmitted by terminal device 200B. On the other hand, for example, terminal device 200A will be able to receive and process Msg2 transmitted from base station device 100 in response to the PRACH transmitted by terminal device 200A. This makes it possible to reduce the possibility of failure of the random access procedure. Note that the information transmitted on the PDCCH is, for example, control information accompanying a response signal.

(Fifth Example)
The base station device 100 may include information indicating whether the RAR is addressed to the terminal device 200B in the RAR. The RAR may be a MAC CE (Medium Access Control Element). When the terminal device 200B receives the RAR and indicates that the information is addressed to the terminal device 200B, the terminal device 200B may apply an offset to the frequency domain resource assignment (FDRA) and/or the time domain resource assignment (TDRA) of msg3 included in the RAR. The offset may be provided by the base station device 100. The offset may also be an integer. When applying an offset to the TDRA, the terminal device 200B may apply the offset to some or all of {PUSCH Mapping Type, transmission slot position, first OFDM symbol index at which msg3 is transmitted, number of OFDM symbols at which msg3 is transmitted} required for transmitting msg 3. Furthermore, the terminal device 200B may apply an offset to a Start and Length Indicator Value (SLIV) derived based on {PUSCH Mapping Type, transmission slot position, first OFDM symbol index at which msg3 is transmitted, number of OFDM symbols at which msg3 is transmitted}. When applying an offset to FDRA, the terminal device 200B may apply the offset to some or all of {the starting RB index to which msg3 is mapped, the number of RBs (resource blocks) to which msg3 is mapped, and the number of RBs of the BWP transmitting msg3} required for transmitting msg3. Furthermore, the terminal device 200B may apply an offset to a Resource Indication Value (RIV) derived based on {the starting RB index to which msg3 is mapped, the number of RBs (resource blocks) to which msg3 is mapped, and the number of RBs of the BWP transmitting msg3}.

In short, in the fifth example, by including information indicating whether the RAR is addressed to terminal device 200B in the RAR transmitted from base station device 100, it is possible to identify the terminal device 200 that is the target of the RAR. This reduces the possibility of failure of the random access procedure. Note that the RAR contains information indicating whether the RAR is addressed to terminal device 200B, and this information is control information that accompanies the response signal. Also, in the fifth example, an example was shown in which control information was included in the RAR, but it may also be included in, for example, DCI (Downlink Control Information) transmitted on the PDCCH that schedules the RAR.

Note that the first to fifth examples may be combined as appropriate, provided no contradictions are present.

As described above, in embodiment 1, terminal device 200 determines whether a signal is a response signal to PRACH based on at least one of the RA-RNTI or the control information associated with the response signal. For example, some parameters in equation 1 that determine the RA-RNTI are set to dedicated parameters when using an RO on the UL subband, so that the RA-RNTI has different values for ROs other than the UL subband and ROs on the UL subband. Furthermore, for example, terminal device 200 can determine whether a response signal is addressed to its own device based on information indicating whether the signal is addressed to terminal device 200B, which is an example of control information associated with the response signal. As a result, the probability of erroneous recognition of Msg2 is reduced in terminal device 200, and the success rate of the random access procedure can be improved when an RO configured on the UL subband and an RO configured other than on the UL subband are configured.

Hardware configuration of each device in each embodiment

The hardware configuration of each device in the wireless communication system of each embodiment will be explained with reference to Figures 11 and 12.

Figure 11 is a diagram showing an example of the hardware configuration of a base station device 100 in this embodiment. As shown in Figure 11, the base station device 100 has, as hardware components, an RF (Radio Frequency) circuit 320 equipped with an antenna 310, a CPU (Central Processing Unit) 330, a DSP (Digital Signal Processor) 340, memory 350, and a network IF (Interface) 360. The CPU is connected via a bus to enable input and output of various signals and data signals. Memory 350 includes at least one of RAM (Random Access Memory) such as SDRAM (Synchronous Dynamic Random Access Memory), ROM (Read Only Memory), and flash memory, and stores programs, control information, and data signals.

The correspondence between the functional configuration of the base station device 100 shown in FIG. 2 and the hardware configuration of the base station device 100 shown in FIG. 11 will be explained. The transmitter 111 and receiver 112 (or communication unit 140) are realized, for example, by an RF circuit 320, or an antenna 310 and an RF circuit 320. The controller 120 is realized, for example, by a CPU 330, a DSP 340, a memory 350, a digital electronic circuit (not shown), etc. Examples of digital electronic circuits include an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programming Gate Array), and an LSI (Large Scale Integration).

Note that the base station device 100 can generate multiple data signals to be transmitted in multiple subbands, and the filters that generate these signals can be configured independently for each subband.

FIG. 12 is a diagram showing an example of the hardware configuration of the terminal device 200 in this embodiment. As shown in FIG. 12, the terminal device 200 has, as hardware components, an RF circuit 420 equipped with an antenna 410, a CPU 430, a DSP 440, and memory 450. Furthermore, the terminal device 200 may have a display device such as an LCD (Liquid Crystal Display) connected to the CPU 430. The memory 450 includes at least one of RAM such as SDRAM, ROM, and flash memory, and stores programs, control information, and data signals.

The correspondence between the functional configuration of the terminal device 200 shown in FIG. 3 and the hardware configuration of the terminal device 200 shown in FIG. 12 will now be explained. The transmitter 211 and receiver 212 (or communication unit 210) are realized, for example, by an RF circuit 420, or an antenna 410 and an RF circuit 420. The control unit 220 is realized, for example, by a CPU 430, a DSP 440, a memory 450, a digital electronic circuit (not shown), etc. Examples of digital electronic circuits include an ASIC, an FPGA, and an LSI.

Note that while each embodiment describes an example of a base station, terminal, and repeater, the disclosed technology is not limited to this and can be applied to a variety of devices, such as electronic devices mounted on automobiles, trains, airplanes, artificial satellites, etc., electronic devices transported by drones, etc., robots, AV equipment, home appliances, office equipment, vending machines, and other household appliances.

Furthermore, while each embodiment has been described using fifth-generation mobile communications as an example, the application of the disclosed technology is not limited to this. For example, the disclosed technology may also be applied to mobile communications of different generations, such as sixth and seventh generations.

REFERENCE SIGNS LIST 1 Wireless communication system 100 100A 100B Base station device C10 C11 Cell 110 Wireless communication unit 111 Transmitter 112 Receiver 120 Control unit 130 Memory unit 140 Communication unit 200 Terminal device 210 Communication unit 211 Transmitter 212 Receiver 220 Control unit 230 Memory unit 310 Antenna 320 RF circuit 330 CPU
340 DSP
350 Memory 360 Network IF
410 Antenna 420 RF circuit 430 CPU
440 DSP
450 memory

Claims (8)

a receiving unit that receives first information configuring a first RO (RACH Occasion) using resources other than an UL subband and second information configuring a second RO on the UL subband;
a transmitter that transmits a PRACH (Physical Random Access Channel) via either the first RO or the second RO;
a control unit that determines a Random Access-Radio Network Temporary Identifier (RA-RNTI) based on the RO that transmitted the PRACH;
The control unit determines whether the signal is a response signal to the PRACH according to at least one of the RA-RNTI or control information associated with the response signal. a first RA-RNTI determined based on the first RO is determined using a first frequency identifier and a first uplink carrier identifier, and a second RA-RNTI calculated based on the second RO is determined using a second frequency identifier and a second uplink carrier identifier;
The terminal device according to claim 1 . the first frequency identifier and the second frequency identifier have different values.
The terminal device according to claim 2 . the first uplink carrier identifier and the second uplink carrier identifier have different values.
The terminal device according to claim 2 . The receiving unit receives, via a PDCCH, the control information for scheduling the response signal;
The PDCCH is scrambled with the RA-RNTI.
The terminal device according to claim 1 . The control information is information indicating whether the response signal is a signal intended for the terminal device constituting the second RO.
The terminal device according to claim 1 . a transmitter that transmits first information constituting a first RO (RACH Occasion) using resources other than the UL subband and second information constituting a second RO on the UL subband;
a receiving unit that receives a PRACH (Physical Random Access Channel) from a first terminal via either the first RO or the second RO;
a control unit that determines a Random Access-Radio Network Temporary Identifier (RA-RNTI) based on the RO that received the PRACH;
The control unit controls the first terminal to determine whether the signal is a response signal to the PRACH according to at least one of the RA-RNTI or control information associated with the response signal.
Base station equipment. a base station device that transmits first information constituting a first RO (RACH Occasion) using resources other than an UL subband and second information constituting a second RO on the UL subband;
a terminal device that transmits a PRACH (Physical Random Access Channel) via either the first RO or the second RO, and determines a Random Access-Radio Network Temporary Identifier (RA-RNTI) based on the RO that transmitted the PRACH;
The terminal device determines whether the signal is a response signal to the PRACH according to at least one of the RA-RNTI or control information accompanying the response signal.