Terminal device, base station device, and wireless communication system

Abstract

A terminal device that transmits a PRACH (Physical Random Access CHannel) to a base station device, wherein the terminal device includes: a reception unit that receives first information about first ROs (Rach Occasions) that can be used by the terminal device and other terminal devices, and second information about second ROs that can be used by the terminal device and cannot be used by the other terminal devices; a control unit that determines, based on the second information or based on the first information and the second information, an RO that is assigned to the terminal device among the first ROs and the second ROs; and a transmission unit that transmits the PRACH to the base station device via the determined RO.

Description

Technical Field

[0001] This disclosure relates to terminal devices, base station devices, and wireless communication systems. Background Technology

[0002] In current networks, mobile terminal (smartphones, feature phones) traffic accounts for a large portion of network resources, and this trend is expected to continue. In addition to the traffic used by mobile terminals, there is also the development of IoT (Internet of Things) services (such as monitoring systems for transportation, smart meters, or devices). Therefore, such networks require services with diverse requirements.

[0003] To address such a variety of services, communication standards for fifth-generation mobile communications (5G or NR (New Radio)) (e.g., Non-Patent Documents 1 to 14) have, for example, developed standards that envision supporting a variety of use cases classified as eMBB (Enhanced Mobile Broadband), Massive MTC (Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications).

[0004] Furthermore, the 3rd Generation Partnership Project (3GPP) is an international standardization project that is currently researching and standardizing extended technologies of the aforementioned communication standards.

[0005] Existing technical documents

[0006] Non-patent literature

[0007] Non-patent document 1: 3GPP TS 37.324 V17.0.0

[0008] Non-patent document 2: 3GPP TS 37.340 V18.0.0

[0009] Non-patent document 3: 3GPP TS 38.201 V18.0.0

[0010] Non-patent document 4: 3GPP TS 38.202 V18.1.0

[0011] Non-patent document 5: 3GPP TS 38.211 V18.1.0

[0012] Non-patent document 6: 3GPP TS 38.212 V18.1.0

[0013] Non-patent document 7: 3GPP TS 38.213 V18.1.0

[0014] Non-patent document 8: 3GPP TS 38.214 V18.1.0

[0015] Non-patent document 9: 3GPP TS 38.215 V18.1.0

[0016] Non-patent document 10: 3GPP TS 38.300 V18.0.0

[0017] Non-patent document 11: 3GPP TS 38.321 V18.0.0

[0018] Non-patent document 12: 3GPP TS 38.322 V18.0.0

[0019] Non-patent document 13: 3GPP TS 38.323 V18.0.0

[0020] Non-patent document 14: 3GPP TS 38.331 V18.0.0 Summary of the Invention

[0021] The problem that the invention aims to solve

[0022] In the wireless communication system described above, for example, there may be a situation where terminal devices supporting NES (Network Energy Saving) cells and terminal devices not supporting NES cells coexist. An NES cell is, for example, a cell that employs techniques capable of reducing the power consumption of the base station device. Techniques capable of reducing the power consumption of the base station include, for example, adjusting the period and number of PRACH (Physical Random Access Channel) resources. Furthermore, techniques capable of reducing the power consumption of the base station include, for example, muting PRACH resources. Muting PRACH resources means, for example, stopping reception on PRACH resources.

[0023] However, for example, the operational methods for NES-enabled and NES-unsupported terminal devices performing the Random Access Channel (RACH) procedure on NES cells are still under investigation and not yet determined. Therefore, in wireless communication systems, for example, the mapping results between ROC (Rach Occasion) and SSB (Synchronization Signal Block) differ between NES-enabled and NES-unsupported terminal devices. For the same ROC, the number of SSBs mapped by an NES-enabled terminal device may differ from the number mapped by an NES-unsupported terminal device. Therefore, in wireless communication systems, for example, a base station receiving a PRACH (Physical Random Access Channel) may be unable to determine the SSB corresponding to the ROC used for PRACH transmission.

[0024] Therefore, a terminal device, a base station device, and a wireless communication system are disclosed that can determine the SSB corresponding to the RO used for PRACH transmission.

[0025] Methods for solving problems

[0026] A terminal device that transmits a PRACH (Physical Random Access Channel) to a base station device, wherein the terminal device comprises: a receiving unit that receives first information relating to a first RO (Rach Occasion) that can be used by the terminal device and other terminal devices, and second information relating to a second RO that can be used by the terminal device but cannot be used by the other terminal devices; a control unit that determines the RO allocated to the terminal device from the first RO and the second RO based on the second information, or based on the first information and the second information; and a transmitting unit that transmits the PRACH to the base station device via the determined RO.

[0027] Invention Effects

[0028] A public SSB can be identified that corresponds to the RO used for PRACH transmission. Attached Figure Description

[0029] Figure 1 This is a diagram illustrating an example of the structure of a wireless communication system 10.

[0030] Figure 2This is a diagram showing an example of the structure of the terminal device 100.

[0031] Figure 3 This is a diagram showing an example of the structure of a base station device 200.

[0032] Figure 4 This is a diagram illustrating a specific example of RO.

[0033] Figure 5 This is a diagram illustrating a specific example of RO.

[0034] Figure 6 This is a diagram illustrating a specific example of RO.

[0035] Figure 7 This is a diagram illustrating a specific example of RO.

[0036] Figure 8 This is a diagram illustrating an example of a sequence of mapping control processing according to the first embodiment.

[0037] Figure 9 This is a diagram illustrating an example of a sequence of mapping control processing according to the first embodiment.

[0038] Figure 10 This is a diagram illustrating a specific example of RO.

[0039] Figure 11 This is a diagram illustrating a specific example of RO.

[0040] Figure 12 This is a diagram illustrating a specific example of RO.

[0041] Figure 13 This is a diagram illustrating a specific example of RO.

[0042] Figure 14 This is a diagram illustrating an example of a sequence of mapping control processing according to the first embodiment.

[0043] Figure 15 This is a diagram illustrating a specific example of RO.

[0044] Figure 16 This is a diagram illustrating a specific example of RO.

[0045] Figure 17 This is a diagram illustrating a specific example of RO.

[0046] Figure 18 This is a diagram illustrating a specific example of RO.

[0047] Figure 19 This is a diagram illustrating a specific example of RO.

[0048] Figure 20 This is a diagram illustrating a specific example of RO.

[0049] Figure 21 This is a diagram illustrating a specific example of RO. Detailed Implementation

[0050] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, this description should not be construed as limiting and does not limit the subject matter described in the claims. Furthermore, various modifications, substitutions, and alterations can be made without departing from the spirit and scope of the present disclosure. Additionally, different embodiments can be appropriately combined.

[0051] [First Implementation Method]

[0052] (Regarding wireless communication systems 10)

[0053] Figure 1 This is a diagram illustrating a structural example of a wireless communication system 10. The wireless communication system 10 includes, for example, terminal device 100a, terminal device 100b, and base station device 200. Hereinafter, terminal device 100a and terminal device 100b will also be collectively referred to as terminal device 100.

[0054] Terminal device 100a is, for example, a communication device that wirelessly connects to base station device 200 and transmits and receives data. Specifically, terminal device 100a is, for example, a smartphone, tablet computer, or other UE (User Equipment). Furthermore, terminal device 100a is, for example, a terminal device 100 supporting an NES cell. Hereinafter, terminal device 100a is also referred to as an NES-capable UE. Furthermore, hereinafter, terminal device 100a will also be abbreviated as NES.

[0055] Terminal device 100b is, for example, a communication device that wirelessly connects to base station device 200 and transmits and receives data. Specifically, terminal device 100b is, for example, a smartphone, tablet terminal, or other UE (User Equipment). Furthermore, terminal device 100b may be, for example, a terminal device 100 that does not support NES cells. In the following text, terminal device 100b is also referred to as a legacy UE. Additionally, hereinafter, terminal device 100b will be abbreviated as LEG.

[0056] The base station device 200 is, for example, a device that wirelessly connects to the terminal device 100 and transmits and receives data. Specifically, the base station device 200 is, for example, an eNodeB or a gNodeB. The base station device 200 supports various communication generations (e.g., 4G, 5G, Beyond 5G, or 6G). Furthermore, the base station device 200 can be configured as a single unit or as multiple units such as CU (Central Unit) and DU (Distributed Unit).

[0057] (Structure example of terminal device 100)

[0058] Figure 2 This is a diagram illustrating a structural example of a terminal device 100. The terminal device 100, for example, includes a CPU (Central Processing Unit) 110, a storage device 120, a memory 130, and a wireless communication circuit 150.

[0059] Storage device 120 may be an auxiliary storage device for storing programs and data, such as flash memory, HDD (Hard Disk Drive), or SSD (Solid State Drive). Storage device 120 may also include storage terminal communication program 121 and mapping control program 122.

[0060] Memory 130 is, for example, an area for loading programs stored in storage device 120. Furthermore, memory 130 can also be used, for example, as an area for storing program data.

[0061] The wireless communication circuit 150 is, for example, a circuit that communicates wirelessly with the base station device 200. The wireless communication circuit 150 includes, for example, an antenna 151. The antenna 151 includes, for example, a directional antenna capable of controlling the direction of radio wave transmission and reception. Additionally, the wireless communication circuit 150 can, for example, change its transmission power.

[0062] CPU 110 is, for example, a processor that performs various processes by loading programs stored in storage device 120 into memory 130 and executing them.

[0063] For example, the CPU 110 constructs a receiving unit and a transmitting unit by executing the terminal communication program 121 to perform terminal communication processing. The terminal communication processing is the process of establishing a wireless connection and conducting wireless communication with the base station device 200.

[0064] CPU 110 constructs a mapping control unit (hereinafter, also simply referred to as the control unit) by executing mapping control program 122, and performs mapping control processing. The mapping control processing is, for example, the mapping (association) of RO (Reach Occasion) and SSB (Synchronization Signal Block).

[0065] (Structural example of base station device 200)

[0066] Figure 3 This is a diagram illustrating an example of the structure of a base station device 200. The base station device 200 includes, for example, a CPU 210, a storage device 220, a memory 230, and a wireless communication circuit 250.

[0067] Storage device 220 is, for example, an auxiliary storage device for storing programs and data, such as flash memory, HDD, or SSD. Storage device 220 may, for example, store base station communication program 221.

[0068] Memory 230 is, for example, an area for loading programs stored in storage device 220. Furthermore, memory 230 can also be used, for example, as an area for storing program data.

[0069] The wireless communication circuit 250 is, for example, a device for wireless communication with the terminal device 100. The wireless communication circuit 250 includes, for example, an antenna 251. The antenna 251 includes, for example, a directional antenna capable of controlling the direction of transmitting and receiving radio waves.

[0070] CPU 210 is, for example, a processor that performs various processes by loading a program stored in storage device 220 into memory 230 and executing it.

[0071] CPU 210, for example, constructs a receiving unit and a transmitting unit by executing base station communication program 221 to perform base station communication processing. Base station communication processing is the process of wirelessly communicating with terminal device 100. Specifically, in base station communication processing, base station device 200 establishes a wireless connection with terminal device 100, sends data to terminal device 100, and receives data from terminal device 100.

[0072] (Specific examples of RO)

[0073] Next, a specific example of RO will be explained. Figures 4 to 7 , Figures 10 to 13 ,as well as Figures 15 to 18 This is a diagram illustrating a specific example of RO. Furthermore, in Figures 4 to 7 , Figures 10 to 13 ,as well as Figures 15 to 18 In the diagram, the horizontal axis corresponds to time, and the vertical axis corresponds to frequency.

[0074] The base station device 200 broadcasts, for example, information related to ROs (Resource Area Codes). This RO-related information includes, for example, at least information about time-domain resources, frequency-domain resources, the number of SSBs allocated to each RO, and the number of preambles for each SSB in each RO. The time-domain resource information is provided, for example, by a PRACH configuration index. The frequency-domain resource information is provided, for example, by the FDM (Frequency Division Multiplexing) number. The FDM number is the number of ROs allocated to the same time.

[0075] Specifically, the base station device 200 broadcasts, for example, information (hereinafter also referred to as first information) relating to the RO (hereinafter also referred to as first RO) that can be used when a terminal device supporting NES cells (e.g., terminal device 100a) and a terminal device not supporting NES cells (e.g., terminal device 100b) respectively transmit PRACH.

[0076] In addition, the base station device 200 broadcasts, for example, information (hereinafter also referred to as second information) related to ROs (hereinafter also referred to as second ROs) that can be used when a terminal device (e.g., terminal device 100a) that supports NES cells sends PRACH and cannot be used when a terminal device (e.g., terminal device 100b) that does not support NES cells sends PRACH.

[0077] Furthermore, the resources corresponding to the first RO will be referred to as resource LR, and the resources corresponding to the second RO will be referred to as resource AR. That is, in Figure 4 In the example shown, the ROs ("RO0", "RO1", "RO2", and "RO3") contained in resource LR1 and the ROs ("RO8", "RO9", "RO10", and "RO11") contained in resource LR2 are first ROs. Furthermore, in Figure 4 In the example shown, the ROs ("RO4", "RO5", "RO6" and "RO7") contained in resource AR1 and the ROs ("RO12", "RO13", "RO14" and "RO15") contained in resource AR2 are second ROs.

[0078] Here, terminal device 100a is, for example, a terminal device 100 capable of identifying both the first information and the second information. That is, terminal device 100a is, for example, a terminal device 100 capable of transmitting PRACH using both the first RO and the second RO. Therefore, for example, in the case of mapping RO to SSB, as... Figure 5As shown, the terminal device 100a maps each SSB to “RO0”, “RO1”, “RO2”, “RO3”, “RO4”, “RO5”, “RO6”, “RO7”, “RO8”, “RO9”, “RO10”, “RO11”, “RO12”, “RO13”, “RO14” and “RO15” respectively.

[0079] Specifically, for example, if the number of SSBs allocated to each RO is set to 1, such as Figure 5 As shown, terminal device 100a, for example, associates “RO0”, “RO1”, “RO2”, “RO3”, “RO4”, “RO5”, “RO6”, and “RO7” with “SSB0”, “SSB1”, “SSB2”, “SSB3”, “SSB4”, “SSB5”, “SSB6”, and “SSB7” respectively. Furthermore, terminal device 100a, for example, associates “RO8”, “RO9”, “RO10”, “RO11”, “RO12”, “RO13”, “RO14”, and “RO15” with “SSB0”, “SSB1”, “SSB2”, “SSB3”, “SSB4”, “SSB5”, “SSB6”, and “SSB7” respectively.

[0080] In contrast, terminal device 100b is, for example, capable of recognizing the first information, but on the other hand, unable to recognize the second information due to differences in the corresponding versions of the program. That is, terminal device 100b is, for example, a terminal device 100 capable of sending PRACH using the first RO but unable to send PRACH using the second RO. Therefore, for example, when performing RO and SSB mapping, as... Figure 6 As shown, terminal device 100b maps each SSB to “RO0”, “RO1”, “RO2”, “RO3”, “RO8”, “RO9”, “RO10” and “RO11” respectively.

[0081] Specifically, such as Figure 6 As shown, terminal device 100a, for example, associates each of “RO0”, “RO1”, “RO2”, “RO3”, “RO8”, “RO9”, “RO10” and “RO11” with “SSB0”, “SSB1”, “SSB2”, “SSB3”, “SSB4”, “SSB5”, “SSB6” and “SSB7” in sequence.

[0082] That is, when terminal device 100a and terminal device 100b perform RO and SSB mapping, for a portion of RO, the SSB mapped by terminal device 100a and the SSB mapped by terminal device 100b may be different.

[0083] Specifically, for example, when terminal device 100a and terminal device 100b each perform Figure 5 and Figure 6 When the mapping is shown, in the wireless communication system 10, as Figure 7 As shown, the SSBs mapped to "RO8", "RO9", "RO10", and "RO11" are different depending on the terminal device 100. Therefore, in the wireless communication system 10, for example, the base station device 200 that receives PRACH may be unable to determine the SSB corresponding to the RO used for PRACH transmission.

[0084] (Mapping control processing in the first embodiment)

[0085] Next, the mapping control processing of the first embodiment will be described. Figure 8 This is a diagram illustrating an example of a sequence of mapping control processing according to the first embodiment. Figure 9 and Figure 14 This is a flowchart of the mapping control process in the first embodiment. Furthermore, Figures 10 to 13 and Figures 15 to 18 This is a diagram illustrating the mapping control process in the first embodiment.

[0086] For example, terminal device 100a measures the RSRP (Reference Signal Received Power) of one or more SSBs broadcast from base station device 200 (S11).

[0087] Then, the terminal device 100a performs a process, for example, selecting the SSB with the highest measured RSRP from one or more SSBs (hereinafter also referred to as SSB selection process) (S12).

[0088] Next, terminal device 100a receives, for example, notification information broadcast from base station device 200 (S13). The notification information is, for example, information sent via SIB1 (System Information Block Type 1). Furthermore, the notification information is, for example, RRC information. The RRC information is, for example, information included in RRC reconfiguration, RRC resume, RRC setup, or reconfiguration with synchronization. Specifically, for example, the notification information may include first information and second information. For example, the first information and the second information may be included in different notification messages.

[0089] Then, the terminal device 100a performs, for example, a process to determine the location (time location and frequency location) of each RO (hereinafter also referred to as RO location determination process) (S14).

[0090] Specifically, terminal device 100a determines the time position of each RO by, for example, referring to information of time-domain resources included in the first information and the second information. Furthermore, terminal device 100a determines the frequency position of each RO by, for example, referring to information of frequency-domain resources included in the first information and the second information.

[0091] Next, the terminal device 100a performs, for example, a mapping process between the first RO and the second RO and the SSB (hereinafter also referred to as mapping process) (S15).

[0092] Then, terminal device 100a sends PRACH to base station device 200, for example, in RO corresponding to the SSB selected in S12 (S16).

[0093] Specifically, for example, in S16, terminal device 100a transmits PRACH using a preamble randomly selected from the preambles mapped in S15 that correspond to the selected RO. Alternatively, for example, terminal device 100a transmits PRACH using a preamble specified by notification information sent from base station device 200.

[0094] (Details of S15 (1))

[0095] Next, the details of S15 will be explained. Figure 9 This is a flowchart illustrating the details of S15 in the first specific example (hereinafter also referred to as the first specific example). Additionally, Figures 10 to 12 This is a diagram illustrating the first specific example.

[0096] like Figure 9 As shown, for example, terminal device 100a performs mapping between each first RO and SSB (S15-1). That is, for example, terminal device 100a performs mapping between ROs and SSBs that can be used by terminal device 100 (e.g., terminal device 100b) that does not support NES. In other words, for example, terminal device 100a performs the same mapping as that performed in terminal device 100 (e.g., terminal device 100b) that does not support NES. Hereinafter, the result of the same mapping as that performed in terminal device 100 (e.g., terminal device 100b) that does not support NES will also be referred to as NES1.

[0097] Specifically, such as Figure 10As shown, for example, terminal device 100a associates "RO0", "RO1", "RO2", and "RO3" included in resource LR21, and "RO8", "RO9", "RO10", and "RO11" included in resource LR22, sequentially with "SSB0", "SSB1", "SSB2", "SSB3", "SSB4", "SSB5", "SSB6", and "SSB7". Furthermore, Figure 10 The example shown illustrates the association of an SSB with a single mapping cycle.

[0098] Next, the terminal device 100a performs, for example, a mapping between the first RO and the second RO and the SSB (S15-2). That is, the terminal device 100a performs, for example, a mapping between the ROs that it can utilize and the SSBs. Hereinafter, the result of the mapping performed in the terminal device 100a will also be referred to as NES2.

[0099] Specifically, such as Figure 4 As shown, for example, terminal device 100a associates with SSB each of the following: “RO0”, “RO1”, “RO2” and “RO3” included in resource LR21; “RO4”, “RO5”, “RO6” and “RO7” included in resource AR21; “RO8”, “RO9”, “RO10” and “RO11” included in resource LR22; and “RO12”, “RO13”, “RO14” and “RO15” included in resource AR22.

[0100] Next, for example, terminal device 100a performs mapping using each RO, and then compares the mapping result with the mapping result performed using the same RO in S15-1 (S15-3).

[0101] Then, the terminal device 100a determines the valid RO (valid RO for its own device) based on the comparison result of the mapping result, for example. Except for cases where the mapping results are different, it is determined to be a valid RO (S15-4).

[0102] Specifically, for example, such as Figure 11 As shown, after mapping using "RO0", terminal device 100a compares the mapping result with the mapping result using "RO0" in S15-1, and since the mapping results are the same, "RO0" is determined to be a valid RO. Then, for example, as Figure 11 As shown, terminal device 100a identifies “RO1”, “RO2” and “RO3” as valid ROs through the same process.

[0103] In addition, such as Figure 11 As shown, after mapping using "RO4", terminal device 100a compares it with the mapping result using "RO4" in S15-1. Since there is no mapping result using "RO4" in S15-1, "RO4" is determined to be a valid RO. Then, for example, as... Figure 11 As shown, terminal device 100a identifies “RO5”, “RO6” and “RO7” as valid ROs through the same process.

[0104] In addition, such as Figure 11 As shown, after mapping using "RO8", terminal device 100a compares the result of mapping using "RO8" in S15-1 with the result of mapping using "RO8" in S15-1. Since the result of mapping using "RO8" in S15-1 is different, "RO8" is not determined as a valid RO.

[0105] Thus, as Figure 12 As shown, terminal device 100a, for example, identifies "RO0", "RO1", "RO2", "RO3", "RO4", "RO5", "RO6", "RO7", "RO12", "RO13", "RO14", and "RO15" as valid ROs and associates them with the SSB. In other words, as Figure 12 As shown, terminal device 100a, for example, identifies ROs other than "RO8", "RO9", "RO10" and "RO11" as valid ROs and associates them with SSB.

[0106] Thus, in this embodiment, terminal device 100a receives, for example, first information relating to a first RO that can be used by both terminal device 100a and terminal device 100b, and second information relating to a second RO that can be used by terminal device 100a but cannot be used by terminal device 100b. Furthermore, in this embodiment, terminal device 100a determines, for example, the ROs allocated to terminal device 100a from the first RO and the second RO based on the first and second information. Then, in this embodiment, terminal device 100a transmits PRACH to base station device 200 via the determined ROs.

[0107] That is, for example, terminal device 100a does not set ROs whose mapping results performed by terminal device 100a are different from those performed by terminal device 100b as valid ROs.

[0108] Therefore, the wireless communication system 10 can, for example, control the system so that the SSBs mapped by the terminal device 100a for the same RO are not different from the SSBs mapped by the terminal device 100b. Thus, in the wireless communication system 10, for example, it is possible to prevent a situation where the base station device 200 receiving the PRACH cannot determine the SSB corresponding to the RO used for PRACH transmission.

[0109] For example, in the case where there is an RO that is both the first RO and the second RO (hereinafter also referred to as an overlapping RO), the terminal device 100a can perform mapping between the ROs other than the overlapping ROs in the first RO and the SSB in S15-2. Specifically, for example, the terminal device 100a is unsure if a RO is a valid RO.

[0110] (Details of S15 (2))

[0111] Figure 14 This is a flowchart illustrating a second specific example (hereinafter also referred to as the second specific example) detailing the situation regarding S15. Additionally, Figures 15 to 17 This is a diagram illustrating the second specific example.

[0112] like Figure 14 As shown, for example, terminal device 100a performs mapping between each first RO and SSB (S15-5). That is, terminal device 100a performs the same process as in S15-1, for example.

[0113] Specifically, such as Figure 15 As shown, for example, terminal device 100a associates "RO0", "RO1", "RO2", and "RO3" included in resource LR31, and "RO8", "RO9", "RO10", and "RO11" included in resource LR32, sequentially with "SSB0", "SSB1", "SSB2", "SSB3", "SSB4", "SSB5", "SSB6", and "SSB7". Furthermore, Figure 15 The example shown illustrates the association of an SSB with a single mapping cycle.

[0114] Next, terminal device 100a performs, for example, mapping of each second RO to SSB (S15-6). That is, for example, terminal device 100a performs mapping between ROs and SSBs that cannot be used by terminal device 100 (e.g., terminal device 100b) that does not support NES.

[0115] Specifically, such as Figure 16As shown, for example, terminal device 100a associates "RO4", "RO5", "RO6", and "RO7" included in resource AR31 and "RO12", "RO13", "RO14", and "RO15" included in resource AR32, sequentially with "SSB0", "SSB1", "SSB2", "SSB3", "SSB4", "SSB5", "SSB6", and "SSB7". Furthermore, Figure 16 The example shown illustrates the association of an SSB with a single mapping cycle.

[0116] Then, as Figure 17 As shown, for example, terminal device 100a associates SSB with the first RO and the second RO.

[0117] Therefore, the wireless communication system 10 can, for example, control the system so that one or more SSBs mapped by terminal device 100a for the same RO are not different from one or more SSBs mapped by terminal device 100b. Thus, in the wireless communication system 10, for example, it is possible to prevent a situation where the base station device 200 receiving the PRACH cannot determine the type of terminal device 100 that is the PRACH transmission source, and the SSB corresponding to the RO used in the PRACH transmission.

[0118] Furthermore, for example, in the presence of overlapping ROs, terminal device 100a can perform mapping between ROs other than the overlapping ROs in the second RO and SSBs in S15-6. Specifically, for example, terminal device 100a may not determine whether a RO is valid.

[0119] [Second Implementation]

[0120] Next, the second embodiment will be described.

[0121] In this embodiment, the terminal device 100a transmits PRACH, for example, by using a preamble that is pre-specified by the base station device 200 from among the preambles that can be used in the SSB selected in S12, etc.

[0122] Specifically, for example, terminal device 100a receives information representing a preamble transmitted from base station device 200 (hereinafter referred to as third information). Furthermore, for example, such as... Figure 8As shown, terminal device 100a determines the preamble represented by the third information received from base station device 200 from the preambles available from the SSBs selected in S12, etc. Furthermore, terminal device 100a transmits PRACH, for example, by using a preamble randomly selected from the determined preamble. Additionally, the third information may be included, for example, in notification information broadcast from base station device 200. Moreover, terminal device 100a may, for example, use the determined preamble to transmit PRACH.

[0123] More specifically, the third information includes the number of preambles (hereinafter also simply referred to as the preamble number) that can be used in the NES-supporting terminal device 100 (e.g., terminal device 100a) and the starting index (hereinafter also simply referred to as the starting index) among the preambles that can be used in the NES-supporting terminal device 100 (e.g., terminal device 100a). Furthermore, for example, terminal device 100a determines the range of indices above the starting index and below the sum of the starting index and the number of preambles as the range of preamble indices that it can use. Additionally, terminal device 100a can, for example, transmit PRACH using a preamble randomly selected from the preambles included in the determined range. Furthermore, terminal device 100a can, for example, use the determined preamble to transmit PRACH.

[0124] Therefore, the base station device 200 can, for example, determine the SSB corresponding to the RO used for PRACH transmission by referring to the preamble corresponding to PRACH. Furthermore, for example, the base station device 200 can determine the type of the terminal device 100 that is the PRACH transmission source.

[0125] [Third Implementation Method]

[0126] Next, the third embodiment will be described. Figures 18 to 21 This is a diagram illustrating a specific example of RO in the third embodiment.

[0127] In this embodiment, the terminal device 100a associates the first RO and the second RO with the SSB, such that, for example, the number of times the SSB mapping cycle is executed during the configuration period of the first RO (hereinafter also referred to as the setting period) is a predetermined integer number (hereinafter also referred to as the first integer number), and the number of times the SSB mapping cycle is executed during the setting period of the second RO is another integer number (hereinafter also referred to as the second integer number). The first integer number and the second integer number can each be, for example, more than once.

[0128] Specifically, in this embodiment, the terminal device 100a controls, for example, by referring to the number of SSBs allocated to each RO contained in the first information and the second information, to make the number of times the SSB mapping cycle is executed during the setting period of the first RO a first integer number of times, and controls to make the number of times the SSB mapping cycle is executed during the setting period of the second RO a second integer number of times.

[0129] More specifically, in Figure 18 In the example shown, for instance, each RO (“RO0”, “RO1”, “RO2”, and “RO3”) contained in resource LR41, each RO (“RO4”, “RO5”, “RO6”, and “RO7”) contained in resource AR41, each RO (“RO8”, “RO9”, “RO10”, and “RO11”) contained in resource LR42, and each RO (“RO12”, “RO13”, “RO14”, and “RO15”) contained in resource AR42 correspond to a set period.

[0130] Therefore, in this case, the terminal device 100a performs a mapping that associates “SSB0”, “SSB1”, “SSB2”, “SSB3”, “SSB4”, “SSB5”, “SSB6” and “SSB7” corresponding to a mapping cycle with each RO, for example, in the setting period composed of resource LR41, the setting period composed of resource AR41, the setting period composed of resource LR42 and the setting period composed of resource AR42.

[0131] Furthermore, in this case, the terminal device 100b performs a mapping that associates “SSB0”, “SSB1”, “SSB2”, “SSB3”, “SSB4”, “SSB5”, “SSB6” and “SSB7” corresponding to a mapping cycle with each RO, for example, in the setting period consisting of resource LR41 and the setting period consisting of resource LR42.

[0132] In addition, Figure 19 In the example shown, each RO (“RO0”, “RO1”, “RO2”, “RO3”, “RO4”, “RO5”, “RO6” and “RO7”) contained in resources LR51 and LR52, each RO (“RO8”, “RO9”, “RO10”, “RO11”, “RO12”, “RO13”, “RO14” and “RO15”) contained in resources AR51 and AR52, and each RO (“RO16”, “RO17”, “RO18”, “RO19”, “RO20”, “RO21”, “RO22” and “RO23”) contained in resources LR53 and LR54 corresponds to a set period.

[0133] Therefore, in this case, for example, the terminal device 100a performs a mapping that associates “SSB0”, “SSB1”, “SSB2”, “SSB3”, “SSB4”, “SSB5”, “SSB6” and “SSB7” corresponding to a mapping cycle with RO in each of the setting periods consisting of resources LR51 and LR52, resources AR51 and AR52 and resources LR53 and LR54.

[0134] Furthermore, in this case, for example, the terminal device 100b performs a mapping that associates “SSB0”, “SSB1”, “SSB2”, “SSB3”, “SSB4”, “SSB5”, “SSB6” and “SSB7” corresponding to a mapping cycle with RO in each of the setting periods consisting of resources LR51 and LR52 and the setting periods consisting of resources LR53 and LR54.

[0135] Therefore, the wireless communication system 10 can, for example, control the system so that one or more SSBs mapped by terminal device 100a for the same RO are not different from one or more SSBs mapped by terminal device 100b. Thus, the wireless communication system 10 can, for example, prevent a situation where the base station device 200 receiving the PRACH cannot determine the SSB corresponding to the RO used for PRACH transmission.

[0136] Furthermore, from the viewpoint of reducing power consumption, the base station device 200 can adjust the configuration period of the second RO, the number of ROs included in the second RO, and silence some of the second ROs. Silencing some of the second ROs means stopping reception in some of the second ROs.

[0137] Specifically, such as Figure 20 As shown, the base station device 200 can, for example, silence each RO within resource AR51. Therefore, the base station device 200, for example, uses an RRC message, a MAC-CE (MAC Control Element), or a DCI (Downlink Control Information) to notify the terminal device 100a to silence each RO within resource AR51. Furthermore, as... Figure 21 As shown, the base station device 200 may, for example, transmit first information that does not contain information related to each RO within resource AR51 or omit the transmission of the first information.

[0138] Here, in Figure 20In the example shown, in resources LR53 and LR54, for example, the SSB corresponding to the NES-supporting terminal device 100 (e.g., terminal device 100a) and the SSB corresponding to the NES-unsupporting terminal device 100 (e.g., terminal device 100b) are different. On the other hand, in Figure 21 In the example shown, in resources LR53 and LR54, for example, the SSB corresponding to the NES-supporting terminal device 100 (e.g., terminal device 100a) and the SSB corresponding to the NES-unsupporting terminal device 100 (e.g., terminal device 100b) are not different.

[0139] Therefore, when the base station device 200 notifies a portion of the second ROs, such as Figure 21 As shown, for example, the notification will include RO silencing within a set period of an integer number (e.g., 1). Furthermore, the base station device 200 will, for example, notify a second RO silencing corresponding to an integer number (e.g., 1) of mapping periods.

[0140] Specifically, for example, base station device 200 includes information related to RO adjustment in the second information and broadcasts this information to terminal device 100a. The information related to RO adjustment includes, for example, at least one of the following: the configuration period of the second RO, the number of ROs corresponding to the second RO, and a mode for silencing a portion of the second ROs. A mode for silencing a portion of the second ROs is, for example, silencing the second ROs corresponding to an integer number (e.g., 1) of mapping periods. A mode for silencing a portion of the second ROs is, for example, silencing the second ROs included in an integer number (e.g., 1) of setting periods.

[0141] Furthermore, the base station device 200 may use, for example, RRC messages, or MAC-CE (MAC control element) or DCI (Downlink control information) to notify the terminal device 100a of the setting period of the second RO and / or the number of ROs corresponding to the second RO and / or the mode of silencing a portion of the second ROs.

[0142] Thus, even when transmitting first information that omits information related to at least a portion of the resource AR, the wireless communication system 10 can prevent the base station device 200 receiving the PRACH from being unable to determine the SSB corresponding to the RO used in the transmission of the PRACH.

[0143] [Variations on the first to third embodiments]

[0144] Next, variations of the first to third embodiments will be described.

[0145] For example, terminal device 100a may not determine the RO pre-specified by base station device 200 as a valid RO.

[0146] Specifically, for example, terminal device 100a can receive information representing a RO (hereinafter referred to as fourth information) sent from base station device 200. Moreover, for example, terminal device 100a can determine ROs other than those represented by the fourth information as valid ROs for its own device.

[0147] Explanation of reference numerals in the attached figures

[0148] 10: Wireless Communication System

[0149] 100: Terminal device

[0150] 100a: Terminal device

[0151] 100b: Terminal device

[0152] 110: CPU

[0153] 120: Storage device

[0154] 121: Terminal Communication Program

[0155] 122: Mapping Control Program

[0156] 130: Memory

[0157] 150: Wireless communication circuit

[0158] 151: Antenna

[0159] 200: Base station equipment

[0160] 210: CPU

[0161] 220: Storage device

[0162] 221: Base Station Communication Program

[0163] 230: Memory

[0164] 250: Wireless communication circuit

[0165] 251: Antenna

Claims

1. A terminal device that transmits a PRACH (Physical Random Access Channel) to a base station device, wherein, The terminal device includes: The receiving unit receives first information related to a first Rach Occasion that can be used by the terminal device and other terminal devices, and second information related to a second Rach Occasion that can be used by the terminal device but cannot be used by the other terminal devices. The control unit determines the RO assigned to the terminal device from the first RO and the second RO based on the second information, or based on the first information and the second information. as well as The transmitting unit transmits the PRACH to the base station device via the determined RO.

2. The terminal device according to claim 1, wherein, The control unit determines specific ROs among the first RO and the second RO that have different SSBs (Synchronization Signal Blocks) established between the terminal devices and each RO, and ROs with different SSBs established between the other terminal devices and each RO. The control unit determines ROs other than the specific ROs as the ROs assigned to the terminal device.

3. The terminal device according to claim 2, wherein, The control unit establishes a correspondence between the first RO and the SSB corresponding to the first mapping period. The control unit establishes a correspondence between the second RO and the SSB corresponding to the second mapping cycle, wherein the second mapping cycle is different from the first mapping cycle.

4. The terminal device according to claim 1, wherein, The receiving unit receives third information related to the preamble from the base station device. The transmitting unit sends the PRACH to the base station device by using a preamble corresponding to the third information.

5. The terminal device according to claim 1, wherein, The control unit establishes a correspondence between the first RO and the second RO and the SSB, such that the number of times the mapping cycle of the SSB is executed during the setting period of the first RO is a first integer, and the number of times the mapping cycle of the SSB is executed during the setting period of the second RO is a second integer.

6. The terminal device according to claim 1, wherein, The receiving unit receives from the base station device fourth information indicating that a specific RO cannot be assigned to the terminal device. The control unit determines the RO other than the specific RO indicated by the fourth information as the RO assigned to the terminal device.

7. A base station device, wherein, The base station device includes: The transmitting unit transmits first information related to a first RO that can be used by both the first terminal device and the second terminal device, and second information related to a second RO that can be used by the first terminal device but cannot be used by the second terminal device. as well as The receiving unit receives PRACH from the first terminal device via RO determined based on the second information, or based on the first information and the second information.

8. A wireless communication system comprising a first terminal device and a base station device, wherein, The base station device includes a transmitting unit that transmits first information related to a first RO that can be used by both the first terminal device and the second terminal device, and second information related to a second RO that can be used by the first terminal device but cannot be used by the second terminal device. The first terminal device determines the RO assigned to the first terminal device from the first RO and the second RO based on the second information or based on both the first information and the second information. The first terminal device sends the PRACH (Physical Random Access Channel) to the base station device via the determined RO.

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