Terminal device, base station, and communication control method

Abstract

The terminal device includes a wireless transceiver and circuitry for receiving configuration information from a base station. The configuration information includes: a first information element indicating a mapping between a plurality of beamforming SSBs and both a first and a second plurality of timings; and a second information element regarding overlap between the first and second plurality of timings in the frequency and time domains. One of three scenarios involving overlap between the first and second plurality of timings is set as the second information element. Based on the configuration information, the circuitry transmits a first preamble at a timing corresponding to a first SSB in the first plurality of timings and transmits a second preamble at a timing corresponding to a second SSB in the second plurality of timings. The first and second timings are different timings in the frequency and time domains.

Description

Technical Field

[0001] The present disclosure relates to a terminal device, a base station, and a communication control method. Background Art

[0002] The 3GPP (Third Generation Partnership Project) has developed specifications for the fifth-generation mobile communication system (hereinafter referred to as 5G). 5G envisions the use of frequencies between 2 GHz and 100 GHz. As the frequency increases, beamforming, which narrows the direction of transmitted radio waves, is used to compensate for propagation loss and achieve gain. Furthermore, when using such directional beams, technologies are known for efficiently utilizing resources by adjusting the settings for scanning the directional beams.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2019-4277 Summary of the Invention

[0006] Technical issues to be solved by the invention

[0007] When a terminal that is not connected using directional beams wishes to connect to a base station, it is required to determine the beam to be used. To determine the beam, a process called beam management is performed using frequency and time resources such as random access. However, in beam management, as the frequency increases and the beam becomes sharper, the number of beams used for beam sweeping increases. Therefore, as the number of beams increases, the frequency and time resource overhead of beam sweeping increases.

[0008] Therefore, the present disclosure proposes a terminal device, a base station, and a communication control method that can reduce the frequency and time resources of beam scanning.

[0009] Technical solutions to solve technical problems

[0010] In order to solve the above technical problems, a terminal device of a solution disclosed in the present invention comprises: a wireless transceiver; and a circuit, which receives setting information from a base station via the wireless transceiver, wherein the setting information includes: one or more first information elements, indicating multiple SSBs (Synchronization Signal Blocks) for beamforming and first multiple RACHs (Random Access Modules). Channel (Random Access Channel) occasion and a second plurality of RACH occasions are mapped respectively; and a second information element relates to a case where the first plurality of RACH occasions overlap with the second plurality of RACH occasions in the frequency domain, the time domain, or the frequency domain and the time domain, one of three situations involving the overlap between the first plurality of RACH occasions and the second plurality of RACH occasions is set as the second information element, the circuit being configured to transmit a first preamble in at least a first RACH occasion associated with a first SSB among the multiple SSBs among the first plurality of RACH occasions, and to transmit a second preamble in a second RACH occasion associated with a second SSB among the multiple SSBs among the second plurality of RACH occasions, based on the setting information, the first RACH occasion and the second RACH occasion being different occasions in the frequency domain, the time domain, or the frequency domain and the time domain. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a diagram showing an example of a low-frequency beam.

[0012] Figure 2 This is a diagram showing an example of a high-frequency beam.

[0013] Figure 3 This is a diagram showing an example of beams with maximum received power in a plurality of base station apparatuses.

[0014] Figure 4 This is a diagram showing an example of the correspondence between DL beam resources and UL RACH opportunities.

[0015] Figure 5 A diagram showing an example of the structure of an antenna panel.

[0016] Figure 6 A diagram showing an example of a synchronization signal.

[0017] Figure 7 This is a diagram showing an example of a conventional method for reducing the overhead of RACH opportunities.

[0018] Figure 8 This is a diagram showing an example of the configuration of a communication system according to an embodiment of the present disclosure.

[0019] Figure 9 This is a diagram showing an example of the configuration of a management device according to an embodiment of the present disclosure.

[0020] Figure 10 This is a diagram showing an example of the configuration of a base station apparatus according to an embodiment of the present disclosure.

[0021] Figure 11 This is a diagram showing an example of the structure of a terminal device according to an embodiment of the present disclosure.

[0022] Figure 12 This is a diagram showing an example of a case where the RACH timings of two beams completely overlap (full overlap).

[0023] Figure 13 This is a diagram showing an example of mapping when IE: msg1-FDM is "1" and completely overlaps.

[0024] Figure 14 This is a diagram showing an example of mapping when IE:msg1-FDM is "4" and completely overlaps.

[0025] Figure 15 This diagram shows an example in which the RACH timings of two beams partially overlap.

[0026] Figure 16 This is a diagram showing an example of mapping when IE: msg1-FDM is "1" and partially overlaps.

[0027] Figure 17 This is a diagram showing an example of mapping when IE:msg1-FDM is "4" and partially overlaps.

[0028] Figure 18 This is a diagram showing an example in which the RACH timings of two beams do not overlap.

[0029] Figure 19 This is a diagram showing an example of mapping when IE:msg1-FDM is "4" and does not overlap.

[0030] Figure 20 This is a diagram showing an example of a description of an assumed standard.

[0031] Figure 21 This is a sequence diagram illustrating an example of a communication control process according to an embodiment of the present disclosure.

[0032] Figure 22 This is a sequence diagram illustrating another example of the communication control process according to the embodiment of the present disclosure.

[0033] Figure 23This is a diagram showing an example of diverting the second RACH opportunity to UL.

[0034] Reference numerals

[0035] 1: Communication system; 10: Management device; 20: Base station device; 40: Terminal device; 11, 21, 41: Communication unit; 12, 22, 42: Storage unit; 13, 24, 45: Control unit; 23, 43: Network communication unit; 44: Input / output unit; 211, 411: Reception processing unit; 211a: Wireless reception unit; 211b: Demultiplexing unit; 211c: Demodulation unit; 211d: Decoding unit; 212, 412: Transmission processing unit; 212a: Encoding unit; 212b: Modulation unit; 212c: Multiplexing unit; 212d: Wireless transmission unit; 214, 414: Antenna. DETAILED DESCRIPTION

[0036] Hereinafter, the embodiments of the present disclosure will be described in detail based on the drawings. In the following embodiments, the same reference numerals are given to the same parts, and repeated descriptions are omitted.

[0037] In addition, the present disclosure will be described in the order of the items shown below.

[0038] 1. Introduction

[0039] 1-1. Beam Scanning Overview

[0040] 1-2. Beam Overhead

[0041] 1-3. Beamforming

[0042] 1-4. Synchronization Signal Details

[0043] 2. Communication system structure

[0044] 2-1. Overall structure of the communication system

[0045] 2-2. Structure of the management device

[0046] 2-3. Configuration of Base Station Device

[0047] 2-4. Terminal Device Structure

[0048] 3. Communication system operation

[0049] 3-1. Relationship of RACH Timing

[0050] 3-2. Transmission of the Same Preamble for Two Beams

[0051] 3-3. When the second RACH opportunity is used for UL

[0052] 4. Modifications

[0053] 5. Summary

[0054] 1. Introduction

[0055] <1-1. Beam Scanning Overview>

[0056] When beamforming is used to achieve gain, propagation loss must be compensated for by beam gain. To increase beam gain, a sharp beam is required, and the number of beams covering a given direction increases.

[0057] Figure 1 This is a diagram showing an example of a low-frequency beam. Figure 2 FIG is a diagram showing an example of a high frequency beam. Figure 1 and Figure 2 As shown, when the terminal device 600 is connected to the base station device 300, Figure 1 The low frequency beam 301 and Figure 2 In the high-frequency beam 302 shown, a sharp beam is required because the propagation loss of the beam 302 is large.

[0058] Figure 3 This figure shows an example of a beam with maximum receiving power among multiple base station devices. The base station device 300 and the terminal device 600 each have a transmission beam and a reception beam. For the downlink (DL: Downlink), it is necessary to determine the transmission beam of the base station device 300 and the reception beam of the terminal device 600. In addition, for the uplink (UL: Uplink), it is necessary to determine the transmission beam of the terminal device 600 and the reception beam of the base station device 300. In these cases, it is necessary to determine a beam from multiple beams so that the reception power of the beam on the receiving side is maximized. In Figure 3 In the example, the beam with the maximum received power at the terminal device 600 is beam 3031 at the base station device 3001 , beam 3032 at the base station device 3002 , and beam 3033 at the base station device 3003 .

[0059] To determine the beam, the beam used for transmission is scanned. On the other hand, on the receiving side, by measuring the received power of the beam while scanning the receiving beam of the receiving side when receiving one of the scanned transmission beams, it is possible to determine which transmission beam and reception beam are the best. This beam scanning is a necessary process in both the case where the base station device 300 receives a beam and the case where the terminal device 600 receives a beam. This process is called beam management (hereinafter also referred to as beam scanning). In this embodiment, the description is mainly based on downlink beam scanning (management).

[0060] Beam scanning can be performed using two methods. The first is beam scanning using a synchronization signal. The synchronization signal is transmitted from base station apparatus 300, and terminal apparatus 600 synchronizes with the network based on the synchronization signal. Synchronization is performed because if terminal apparatus 600 does not recognize the frame timing transmitted from base station apparatus 300, uplink and downlink transmissions cannot proceed smoothly.

[0061] The second is beam scanning using downlink reference signals such as CSI-RS (Channel State Information Reference Signal) and SRS (Sounding Reference Signal) and uplink reference signals. The first beam scanning using synchronization signals is provided for the entire cell. In contrast, the second CSI-RS and SRS can implement beam scanning provided for one terminal device 600. In addition, the beams using synchronization signals are mostly coarser than the beams of CSI-RS and SRS. In other words, the first beam scanning using synchronization signals provides a beam for the coverage range of the entire cell, so there is a lot of waste of frequency and time resources caused by the beam. Therefore, in this embodiment, the focus is on the first beam scanning using synchronization signals.

[0062] <1-2. Beam Overhead>

[0063] When terminal device 600 first connects to the network, it must connect to the base station using random access (Random Access) using frequency and time resources (uplink), where packet transmissions may conflict with other terminals. This is because terminal device 600 is not yet connected to base station device 300 and, therefore, cannot be allocated resources from base station device 300.

[0064] When beam scanning is performed using synchronization signals, random access opportunities (Random Access Occasions) corresponding to the number of beams from base station apparatus 300 are prepared in advance during the initial random access. Therefore, base station apparatus 300 can determine the transmission beam of base station apparatus 300 desired by terminal apparatus 600 based on which random access opportunity terminal apparatus 600 performs random access (i.e., the transmitted Random Access Preamble).

[0065] In addition, when the frequency becomes higher and the beam becomes sharper, the number of beams required for beam scanning increases. For example, if the angle of beam coverage changes from 10 degrees to 1 degree, then in simple terms, 10 times the beams are needed to cover all directions. To give an example of frequency, if 10 beams can be used to cover at 6GHz, 60 beams are needed for beam scanning at 60GHz. In other words, unless the beams are sent at a time that is staggered by 60 degrees, the coverage range cannot be covered. In this case, the overhead of the frequency and time resources required for the downlink (DL) beam scanning itself, and the number of random access opportunities for the uplink (UL) to notify which beam is which, increase in the same way as the beams, and the resulting overhead causes problems. In addition, in the following description, the random access opportunity will also be referred to as the RACH (Random Access Channel) opportunity (Occasion).

[0066] Here, use Figure 4 The correspondence between DL beam resources and UL RACH timing is explained. Figure 4 FIG is a diagram showing an example of the correspondence between DL beam resources and UL RACH opportunities. Figure 4 As shown, one UL RACH opportunity corresponds to one DL beam. Therefore, as the number of beams increases, the number of DL beams and UL RACH opportunities also increases. In this embodiment, the reduction of the frequency and time resource overhead of UL RACH opportunities is described.

[0067] <1-3. Beam Formation>

[0068] Next, use Figure 5 Beam forming will be described. Figure 5 This figure shows an example of the structure of an antenna panel. As a method for controlling the directivity of the antenna, there is a fully digital method. In the fully digital method, it is necessary to have the same number of antenna weights as antenna elements in the digital area. Antenna weights refer to weights used to control amplitude and phase. However, in the fully digital method, the digital circuit becomes larger. Therefore, Figure 5 As shown, a phase shifter is usually used as an antenna weight that can only control the phase in the analog domain. This approach is called an analog-digital hybrid architecture.

[0069] The antenna weights in the digital area are implemented in the frequency domain using the OFDM (Orthogonal Frequency Division Multiplexing) modulation method, that is, before the IFFT (Inverse Fast Fourier Transform) during transmission and after the FFT (Fast Fourier Transform) during reception. Therefore, when the antenna weights in the digital area are implemented in the frequency domain, different frequency resources can be used to point the beam in different directions even at the same time. On the other hand, since the antenna weights implemented in the analog area always control the antenna weights in the time domain, the beam can only be pointed in the same direction in all frequency domains at the same time. Basically, beam processing in the analog area is preferred in terms of cost, so pointing the beam in different directions at the same time is not preferred for both the terminal device and the base station device.

[0070] exist Figure 5 In the example of the antenna panel structure, three phase shifters of analog regions are connected to the weight of one digital region. This group is gathered and configured as an antenna panel. Figure 5 The example shows a case where three antenna elements form one antenna panel, and two antenna panels are used. Normally, a single antenna panel cannot generate beams in different directions by using different frequencies at the same time. However, using two antenna panels allows beams in different directions to be generated at the same time. This antenna panel configuration is used by both base stations and terminal devices.

[0071] <1-4. Details of Synchronization Signals>

[0072] According to 3GPP TS38.211, regarding the preamble sent by the terminal device (hereinafter also referred to as UE (User Equipment)) used in random access, 64 different preambles are allocated for each RACH opportunity. Therefore, in the case where a UE that considers the same transmission beam of the base station device to be better sends a preamble at the same RACH opportunity, if different preambles are used, it is possible to separate and distinguish them on the base station device side. The RACH opportunity, that is, the range of UL resources in which the UE can send the preamble is notified by the system information (for example, SIB1) provided by the base station device. The frequency and time resources are notified to the UE by the system information. The SSB (Synchronization Signal Block), which is an element corresponding to the beam, and the RACH opportunity are basically in a one-to-one relationship. It is assumed that the base station device that points the transmission beam in a certain direction when sending the SSB uses the reception beam facing the same direction to receive the resources of the corresponding RACH opportunity.

[0073] Figure 6 FIG. 1 is a diagram showing an example of a synchronization signal. Figure 6 As shown, the synchronization signal is a signal that periodically transmits an SSB burst (SS burst, SS burst) composed of multiple beamformed SSB elements. The SSB includes sequences such as PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal) used as synchronization signals, as well as system information broadcasted such as PBCH (Physical Broadcast Channel). PSS and SSS, like LTE (Long Term Evolution), can be used for time / frequency synchronization and the derivation of cell ID (Physical Cell Identifier). Each SSB is beamformed and transmitted in different directions. Therefore, the terminal device receives the SSB in the direction of the terminal device and performs synchronization.

[0074] Figure 7 FIG. 1 is a diagram showing an example of a conventional method for reducing the overhead of RACH timing. Figure 7 As shown, conventionally, as a method for reducing RACH opportunity overhead, a single RACH opportunity was prepared for multiple beams. Furthermore, this approach did not envision the possibility of a terminal device reporting for multiple beams in a single RACH opportunity. Furthermore, it did not consider the possibility of using the RACH opportunity for other purposes.

[0075] 3GPP Rel.15 TS 38.331 specifies whether to allocate multiple beams to a single RACH opportunity and transmits a preamble indicating the allocation of a single beam during all of the multiple RACH opportunities. However, the relationship between multiple beams and multiple RACH opportunities, and how terminal devices report multiple beams (transmit preambles), remain unclear.

[0076] (Technical Issues in Preamble Transmission)

[0077] As the frequency increases, the beam becomes narrower, and the number of beams required for beam scanning increases. The frequency and time resources for reporting RACH opportunities are associated with each beam, so the base station must wait using a receive beam with the same directivity as when the terminal device observed the DL beam. The terminal device transmits a preamble consisting of a random sequence during this RACH opportunity. It is generally believed that using the aforementioned conventional technology of allocating multiple beams to a single RACH opportunity will reduce the frequency and time resources required for RACH opportunities. This is because using RACH opportunities corresponding to multiple beams does not necessarily require a smaller number of RACH opportunities.

[0078] In the case where the terminal device reports on multiple beams (for example, two), it may be possible to imagine a situation where the reports are made at the same RACH opportunity at the same time. At this time, the terminal device obtains the desired receive beam (Rx beam) for the two beams receiving DL. When reporting, two transmit beams (Txbeam) pointing in the same direction as the two receive beams are used to report in one RACH opportunity. In other words, the terminal device needs to use transmit beams in different directions to make two reports at the same time with the same frequency and time resources. On the terminal device side, when the transmit beam is generated by a phase shifter in the analog area, such an operation is difficult for the terminal device. In other words, in the terminal device, due to cost issues, power consumption, and complexity of the RF circuit, it is difficult to send a preamble code using beams in different directions at the same time.

[0079] In other words, it is difficult for a terminal device to simultaneously transmit multiple preambles in a single RACH opportunity, making it impossible to properly report on beams. Furthermore, if the base station device has RACH opportunities capable of receiving multiple beams, it is assumed that a receive beam in the digital area is used, or that different antenna panels are prepared for each different beam.

[0080] (Technical issues from a standards perspective)

[0081] 3GPP Rel.15TS38.331 discloses: (1) a setting for allocating one SSB to multiple RACH opportunities (for example, ssb-perRACH-Occasion / ssb-perRACH-OccasionAndCB-PreamblesPerSSB is 1 / 8, 1 / 4, 1 / 2) and (2) a setting for allocating multiple beams (multiple SSBs with different SSB indices) to one RACH opportunity (for example, ssb-perRACH-Occasion / ssb-perRACH-OccasionAndCB-PreamblesPerSSB is 2, 4, 8, 16). In addition, in the 3GPP standard, one subframe (1 ms) can include one or more PRACH slots (PRACH slot(s)), and one PRACH slot can include one or more RACH opportunities.

[0082] Here, (2) means the configuration in which multiple beams are assigned to one PRACH opportunity, but does not mention whether the number of beams (preambles) to be transmitted simultaneously in one PRACH opportunity in the time axis direction is actually multiple. (2) It is possible to allow one UE to simultaneously transmit preambles corresponding to multiple different beams (SSBs) in one PRACH opportunity in the time axis direction, but as mentioned above, this is unrealistic. This is because when the number of beams or preambles that can be transmitted in one PRACH opportunity in the time axis direction is set to multiple, it is expected that the manufacturing cost, power consumption, and complexity of the RF circuit will increase, which will cause a major problem on the terminal device side.

[0083] Therefore, according to (2), it may be practical to allocate multiple beams (multiple SSBs with different SSB indices) to a single RACH opportunity, and transmit a preamble in that RACH opportunity for a beam with good radio quality among the multiple beams. If the base station apparatus waits to receive multiple beams corresponding to that RACH opportunity, it can identify the SSB index corresponding to the beam transmitted by the UE (terminal apparatus) among the multiple possible beams.

[0084] On the other hand, in high-frequency bands like millimeter waves, even small obstacles between the UE and the RAN (Radio Access Network) can degrade radio quality and cause radio link problems. To quickly recover the radio link, it may be necessary to secure (i.e., pre-report to the network) multiple beams with good radio quality (e.g., SSB). In other words, it is beneficial to report multiple beams to the network in at least one PRACH slot.

[0085] By setting "ssb-perRACH-Occasion / ssb-perRACH-OccasionAndCB-PreamblesPerSSB" to "1 / 8, 1 / 4, 1 / 2, 1" as in (1), multiple RACH opportunities corresponding to each SSB can be used to report multiple beams (SSBs) in one PRACH time slot.

[0086] Here, in the current 3GPP specifications, the maximum number of SSBs (Lmax) in one SSB burst is 64. In other words, a maximum of 64 beams are formed for beam scanning, etc. Since FR2 is a frequency range of 24250 MHz to 52600 MHz, Lmax = 64 is specified as the number of SSBs that can be handled in this frequency band.

[0087] However, this may be expanded in the future and new regulations may be imposed on frequency bands higher than 52600MHz (for example, 100GHz band) and frequency ranges (for example, FR3). In this case, the maximum number of SSBs in one SSB burst (Lmax) of 64 may not be enough. When the number of Lmax increases (for example, Lmax = 128), setting "ssb-perRACH-Occasion / ssb-perRACH-OccasionAndCB-PreamblesPerSSB" to "1 / 8, 1 / 4, 1 / 2, 1" may result in insufficient PRACH opportunities. There is also a method of dividing other PRACH resources such as PRACH preambles, but considering the conflict with other UEs, this may not be realistic.

[0088] Therefore, it is desired to stipulate the following mechanism: multiple beams (multiple SSBs with different SSB indices) are allocated to one RACH opportunity, and the multiple beams (multiple SSBs with different SSB indices) can be reported to the network in one PRACH time slot including multiple RACH opportunities to which multiple beams are allocated.

[0089] <<2. Communication System Structure>>

[0090] The communication system 1 includes a base station device and can be wirelessly connected to a terminal device.

[0091] Furthermore, the communication system 1 can support radio access technologies (RATs) such as LTE and NR (New Radio). LTE and NR are cellular communication technologies that implement mobile communication for terminal devices by configuring multiple base station coverage areas in the form of cells.

[0092] In addition, in the following description, it is assumed that "LTE" includes LTE-A (LTE-Advanced, LTE enhanced version), LTE-APro (LTE-Advanced Pro, LTE enhanced version Pro) and EUTRA (Evolved Universal Terrestrial Radio Access, evolved universal terrestrial radio access). In addition, it is assumed that NR includes NRAT (New Radio Access Technology, new radio access technology) and FEUTRA (Further EUTRA). In addition, a single base station can manage multiple cells. In the following description, the cell corresponding to LTE is called an LTE cell, and the cell corresponding to NR is called an NR cell.

[0093] NR is the next (fifth) generation radio access technology (RAT) to LTE (the fourth generation of communications, including LTE-Advanced and LTE-Advanced Pro). NR is a radio access technology that can address a variety of use cases, including eMBB (Enhanced Mobile Broadband), mMTC (Massive Machine Type Communications), and URLLC (Ultra-Reliable and Low Latency Communications). Research is underway on the technical framework for NR, tailored to the usage scenarios, requirements, and deployment scenarios of these use cases.

[0094] Hereinafter, the configuration of the communication system 1 will be described in detail.

[0095] <2-1. Overall Structure of Communication System>

[0096] Figure 8This figure illustrates an example of the structure of a communication system according to an embodiment of the present disclosure. Communication system 1 is a wireless communication system that provides a wireless access network for terminal devices. For example, communication system 1 is a cellular communication system that uses a wireless access technology such as LTE or NR. Here, the wireless access network may be E-UTRAN (Evolved Universal Terrestrial Radio Access Network) or NG-RAN (Next Generation Radio Access Network).

[0097] like Figure 8 As shown in FIG. 1 , the communication system 1 includes a management device 10, a base station device 20, and a terminal device 40. The communication system 1 provides users with a wireless network capable of mobile communication by cooperating with each wireless communication device constituting the communication system 1. The wireless network of this embodiment includes a radio access network RAN ​​and a core network CN. In addition, a wireless communication device is a device having a wireless communication function. Figure 8 In the example, it corresponds to the base station device 20 and the terminal device 40.

[0098] In the communication system 1, a plurality of management devices 10, base station devices 20, and terminal devices 40 may be provided, or each device may be provided with one. Figure 8 In the example shown in FIG. 1 , the communication system 1 includes management devices 101 and 102 as the management device 10. The communication system 1 also includes base station devices 201, 202, and 203 as the base station device 20. The communication system 1 also includes terminal devices 401, 402, and 403 as the terminal device 40.

[0099] Furthermore, the devices in the diagram can be considered to be logical devices. That is, some of the devices in the diagram can be implemented using virtual machines (VMs), containers, application container engines (Docker), etc., which can be physically installed on the same hardware.

[0100] In addition, LTE base stations are sometimes referred to as eNodeB (Evolved Node B) or eNB. In addition, NR base stations are sometimes referred to as NGRAN Node (Next Generation RAN node), gNodeB or gNB. In addition, in LTE and NR, terminal devices (also called mobile stations, mobile station devices or terminals) are sometimes referred to as UE (User Equipment). In addition, a terminal device is a type of communication device, also referred to as a mobile station, mobile station device or terminal.

[0101] In this embodiment, the concept of a communication device includes not only portable devices (terminal devices) such as portable terminals, but also devices installed on structures and mobile objects. Structures and mobile objects themselves can be considered communication devices. Furthermore, the concept of a communication device includes not only terminal devices, but also base station devices and relay devices. A communication device is a type of processing device or information processing device. Furthermore, a communication device can be referred to as a transmitting device or a receiving device.

[0102] (Management Device)

[0103] The management device 10 is a device for managing a wireless network. For example, the management device 10 is a device for managing communications of the base station device 20. For example, the management device 10 is a device that functions as an MME (Mobility Management Entity), an AMF (Access and Mobility Management Function), or an SMF (Session Management Function). In addition, the MME is a type of EPC node described later, and is connected to the EUTRAN via the S1 interface to control NAS (Non-Access Stratum) signaling with the UE and manage the mobility of the UE. The AMF is a type of 5GC node described later, and is connected to the NGRAN via the NG interface to control NAS (Non-Access Stratum) signaling with the UE and manage the mobility of the UE.

[0104] The management device 10 may be included in the core network CN along with a gateway device and the like. The core network CN is a network owned by a specified entity (subject), such as a mobile communications operator. Examples of the core network CN include the Evolved Packet Core (EPC) and the 5G Core network (5GC). Furthermore, the specified entity may be the same as or different from the entity that uses, operates, and / or manages the base station device 20.

[0105] In addition, in addition to the control plane (C-Plane) nodes such as the management device 10, the core network may also include user plane (U-Plane) nodes that forward user data between the packet data network (OPDN) or data network (DN) and the RAN. The user plane nodes in the EPC may include S-GW (Serving Gateway) and P-GW (PDN-Gateway). The user plane nodes in the 5GC may include UPF (U-Plane Function). For example, the management device 10 manages the location of the terminal device 40 for each terminal device 40 (UE) in the communication system 1 according to an area unit composed of multiple cells (for example, Tracking Area, RAN Notification Area). In addition, the management device 10 can grasp and manage which base station (or which cell) the terminal device 40 is connected to, which base station (or which cell) the terminal device 40 is located in, and the communication area of ​​​​which base station (or which cell) it exists in, etc. for each terminal device 40 according to the cell unit.

[0106] Furthermore, the management device 10 may function as a gateway. For example, if the core network is an EPC, the management device 10 may function as an S-GW or P-GW. Furthermore, if the core network is a 5GC, the management device 10 may function as a UPF (User Plane Function). Furthermore, the management device 10 may be an SMF, PCF, UDM, etc. The core network CN may include SMF, PCF, UDM, etc.

[0107] Furthermore, the management device 10 does not necessarily need to be a device that constitutes the core network CN. For example, assuming the core network CN is a W-CDMA (Wideband Code Division Multiple Access) or cdma2000 (Code Division Multiple Access 2000) core network, the management device 10 can function as an RNC (Radio Network Controller).

[0108] The management device 10 is connected to each of the plurality of base station devices 20. For example, in the case of 5GS, an N2 reference point exists between the AMF and the NG-RAN, and the AMF and the NG-RAN are logically connected to each other via an NG interface.

[0109] The management device 10 manages communications with the base station device 20. For example, the management device 10 manages the location of each terminal device 40, based on an area unit composed of multiple cells (e.g., Tracking Area, RAN Notification Area). Furthermore, the management device 10 may also understand and manage, for each terminal device 40, which base station device (or cell) the terminal device 40 is connected to, and which base station device (or cell) the terminal device 40 is located within.

[0110] (Base Station Device)

[0111] The base station apparatus 20 is a wireless communication apparatus that performs wireless communication with the terminal apparatus 40. The base station apparatus 20 is a type of communication apparatus. In addition, the base station apparatus 20 is a type of information processing apparatus.

[0112] The base station device 20 can be a device equivalent to, for example, a wireless base station (Base Station, Node B, eNB, gNB, etc.) or a wireless access point. Furthermore, when the base station device 20 is an eNB, gNB, etc., the base station device 20 can be referred to as 3GPP access. Furthermore, when the base station device 20 is a wireless access point, it can be referred to as non-3GPP access. Furthermore, the base station device 20 can be a wireless relay node (Relay Node). Furthermore, the base station device 20 can be an optical extension device called an RRH (Remote Radio Head). Furthermore, the base station device 20 can be a receiving station device such as an FPU (Field Pickup Unit). Furthermore, the base station device 20 can be an IAB (Integrated Access and Backhaul) donor node or IAB relay node that provides wireless access lines and wireless backhaul lines through time division multiplexing, frequency division multiplexing, or space division multiplexing.

[0113] Furthermore, when the base station apparatus 20 is a gNB, the base station apparatus may be referred to as a combination of a gNB CU (Central Unit) and a gNB DU (Distributed Unit), or any combination thereof. In this embodiment, a base station of a wireless communication system may sometimes be referred to as a base station apparatus. The base station apparatus 20 may be configured to be capable of wireless communication with other base station apparatuses 20. For example, when multiple base station apparatuses 20 are mutually eNBs or a combination of an eNB and a gNB, the relevant apparatuses may be connected via an X2 interface. Furthermore, when multiple base station apparatuses 20 are mutually gNBs or a combination of an eNB and a gNB, the relevant apparatuses may be connected via an Xn interface. Furthermore, when multiple base station apparatuses 20 are a combination of a gNB CU and a gNB DU, the relevant apparatuses may be connected via an F1 interface. The messages / information described below (e.g., RRC signaling or DCI information) may be communicated between multiple base station apparatuses 20 (e.g., via the X2, Xn, or F1 interfaces).

[0114] In addition, the wireless access technology used by the base station device 20 may be a cellular communication technology or a wireless LAN technology. Of course, the wireless access technology used by the base station device 20 is not limited to these, and may be other wireless access technologies. The wireless access technology used by the base station device 20 may be an LPWA (Low Power Wide Area) communication technology. Here, LPWA communication is communication in accordance with the LPWA standard. Examples of LPWA standards include ELTRES, ZETA, SIGFOX, LoRaWAN, and NB-Iot. Of course, the LPWA standard is not limited to these, and may be other LPWA standards. In addition, the wireless communication used by the base station device 20 may be wireless communication using millimeter waves. In addition, the wireless communication used by the base station device 20 may be wireless communication using radio waves, or wireless communication using infrared or visible light (optical wireless).

[0115] The base station device 20 may be capable of performing NOMA (Non-Orthogonal Multiple Access) communication with the terminal device 40. Here, NOMA communication is communication (transmission, reception, or both) using non-orthogonal resources. In addition, the base station device 20 may be configured to be capable of performing NOMA communication with other base station devices 20.

[0116] Furthermore, the base station devices 20 may be able to communicate with each other via a base station device-core network interface (e.g., an S1 interface, an NG interface, etc.). This interface may be either wired or wireless. Furthermore, the base station devices may be able to communicate with each other via an inter-base station device interface (e.g., an X2 interface, an Xn interface, etc.). This interface may be either wired or wireless.

[0117] Furthermore, multiple base station devices 20 may be able to communicate with each other via a base station device-core network interface (e.g., NG Interface, S1 Interface, etc.). This interface may be either wired or wireless. Furthermore, base station devices may be able to communicate with each other via an inter-base station device interface (e.g., Xn Interface, X2 Interface, etc.). This interface may be either wired or wireless.

[0118] Furthermore, the base station device 20 may be composed of a collection of multiple physical or logical devices. For example, in this embodiment, the base station may be divided into multiple devices, namely, a BBU (Baseband Unit) and a RU (Radio Unit), and may be interpreted as a collection of these multiple devices. Further or alternatively, in the embodiments of the present disclosure, the base station may be either or both of the BBU and the RU. The BBU and the RU may be connected via a specified interface (e.g., eCPRI). Further or alternatively, the RU may be referred to as an RRU (Remote Radio Unit) or an RD (RadioDoT). Further or alternatively, the RU may correspond to a gNB-DU. Further or alternatively, the BBU may correspond to a gNB-CU. Further or alternatively, the RU may be a device formed integrally with an antenna. The antenna of the base station (e.g., an antenna formed integrally with the RU) may adopt an Advanced Antenna System that supports MIMO (e.g., FD-MIMO) and beamforming. In an advanced antenna system, an antenna included in a base station (for example, an antenna integrated with an RU) may include, for example, 64 transmission antenna ports and 64 reception antenna ports.

[0119] Furthermore, multiple base station devices 20 may be interconnected. One or more base station devices 20 may be included in a radio access network (RAN). That is, a base station may also be referred to as a RAN, a RAN node, an AN (Access Network), or an AN node. The RAN in LTE is called EUTRAN (Enhanced Universal Terrestrial RAN). The RAN in NR is called NGRAN. The RAN in W-CDMA (UMTS) is called UTRAN.

[0120] LTE base stations are sometimes referred to as eNodeBs (Evolved Node Bs) or eNBs. That is, the EUTRAN includes one or more eNodeBs (eNBs). NR base stations are sometimes referred to as gNodeBs or gNBs. That is, the NGRAN includes one or more gNBs. Furthermore, the EUTRAN may include gNBs (en-gNBs) connected to the core network (EPC) in the LTE communication system (EPS). Similarly, the NGRAN may include ng-eNBs connected to the core network 5GC in the 5G communication system (5GS).

[0121] Furthermore, when the base station is an eNB, gNB, or the like, it may also be referred to as 3GPP access. Furthermore, when the base station is a wireless access point (AP), it may also be referred to as non-3GPP access. Furthermore, the base station may be an optical extension device called an RRH (Remote Radio Head). Furthermore, or alternatively, when the base station is a gNB, it may also be referred to as a combination of the aforementioned gNB CU (Central Unit) and gNB DU (Distributed Unit), or any combination thereof.

[0122] To communicate with the UE, the gNB CU (Central Unit) manages (hosts) multiple higher-level layers in the access stratum (e.g., RRC, SDAP, and PDCP). Meanwhile, the gNB-DU manages (hosts) multiple lower-level layers in the access stratum (e.g., RLC, MAC, and PHY). Specifically, among the messages and information described below, RRC signaling (quasi-static notification) can be generated by the gNB CU, while DCI (dynamic notification) can be generated by the gNB-DU. Alternatively, some configurations in RRC configuration (quasi-static notification), such as the cellGroupConfig IE (Information Elements), can be generated by the gNB-DU, while the remaining configurations can be generated by the gNB-CU. These configurations can be sent and received via the F1 interface.

[0123] The base station apparatus 20 can be configured to communicate with other base station apparatuses 20. For example, when multiple base station apparatuses 20 are mutually eNBs or a combination of an eNB and an en-gNB, the relevant base station apparatuses 20 can be connected to each other via an X2 interface. Furthermore, when multiple base station apparatuses 20 are mutually gNBs or a combination of a gNB and a gNB, the relevant apparatuses can be connected to each other via an Xn interface. Furthermore, when multiple base station apparatuses 20 are a combination of a gNB CU (Central Unit) and a gNB DU (Distributed Unit), the relevant apparatuses can be connected to each other via the aforementioned F1 interface. Messages and information (RRC signaling or DCI information) can be communicated between multiple base stations (e.g., via the X2, Xn, and F1 interfaces).

[0124] Base station apparatus 20 may be used, operated, and / or managed by various entities (subjects). Examples of such entities include mobile network operators (MNOs), mobile virtual network operators (MVNOs), mobile virtual network enablers (MVNEs), neutral host network (NHN) operators, businesses, educational institutions (such as school corporations and local government boards of education), real estate (such as buildings and apartments) managers, and individuals.

[0125] Of course, the entities that use, operate, and / or manage base station apparatus 20 are not limited to these. Base station apparatus 20 can be installed and / or operated by a single operator, or by an individual. Of course, the entities that install / operate base station apparatus 20 are not limited to these. For example, base station apparatus 20 can be installed / operated jointly by multiple operators or multiple individuals. Alternatively, base station apparatus 20 can be a shared facility used by multiple operators or multiple individuals. In this case, the installation and / or operation of the facility can be carried out by a third party separate from the user.

[0126] Furthermore, the concept of a base station device (also referred to as a base station) includes not only a donor base station but also a relay base station (also referred to as a relay station, a transfer station, a relay base station, or a transfer station device). Furthermore, the concept of a base station includes not only a structure having the function of a base station but also a device installed on the structure.

[0127] Structures include buildings such as skyscrapers, houses, towers, stations, airports, ports, and stadiums. Furthermore, the term "structure" encompasses not only buildings but also non-building structures such as tunnels, bridges, dams, walls, and iron columns, as well as cranes, gates, and windmills. Furthermore, the term "structure" encompasses not only structures on land (in the narrow sense) or underground but also structures above water such as docks and floating docks, and underwater structures such as oceanographic observation facilities. A base station device can be alternatively referred to as a processing device or an information processing device.

[0128] The base station device 20 can be either a donor station or a relay station (transfer station). In addition, the base station device 20 can be either a fixed station or a mobile station. A mobile station is a wireless communication device (such as a base station device) configured in a movable manner. In this case, the base station device 20 can be either a device installed on a mobile body or the mobile body itself. For example, a relay station device with mobility can be regarded as a base station device 20 serving as a mobile station. In addition, devices such as vehicles, aerial vehicles, and smartphones that originally have mobility and are equipped with the functions of a base station device (at least part of the functions of a base station device) are also equivalent to the base station device 20 serving as a mobile station.

[0129] Here, the mobile object may be a mobile terminal such as a smartphone or a mobile phone. Furthermore, the mobile object may be a mobile object that moves on land (in the narrow sense of the word) (e.g., a car, bicycle, bus, truck, motorcycle, train, linear motor train, etc.), or a mobile object that moves underground (e.g., in a tunnel) (e.g., a subway).

[0130] The mobile body may be a mobile body that moves on water (for example, a passenger ship, a cargo ship, a hovercraft or other ships), or a mobile body that moves underwater (for example, a submersible, a submarine, a drone or other submersible vessel).

[0131] Furthermore, a mobile object may be one that moves within the atmosphere (e.g., aircraft, airships, drones, and other aerial vehicles) or one that moves outside the atmosphere (e.g., artificial satellites, spacecraft, space stations, probes, and other artificial celestial bodies). A mobile object that moves outside the atmosphere may be referred to as a space mobile object.

[0132] In addition, the base station device 20 can be a ground base station device (ground station device) installed on the ground. For example, the base station device 20 can be a base station device configured on a structure on the ground, or a base station device installed on a mobile body moving on the ground. More specifically, the base station device 20 can be an antenna installed on a structure such as a building and a signal processing device connected to the antenna. Of course, the base station device 20 can also be the structure or the mobile body itself. "On the ground" is not only on land (on the ground in a narrow sense), but also on the ground in a broad sense including underground, on water, and underwater. In addition, the base station device 20 is not limited to a ground base station device. The base station device 20 can be a non-ground base station device (non-ground station device) that can float in the air or in space. For example, the base station device 20 can be an aircraft station device or a satellite station device.

[0133] An aircraft station device is a wireless communication device such as an aircraft that can float in the atmosphere (including the stratosphere). The aircraft station device can be a device mounted on an aircraft, etc., or it can be the aircraft itself. In addition, the concept of aircraft includes not only heavy aircraft such as airplanes and gliders, but also light aircraft such as balloons and airships. In addition, the concept of aircraft includes not only heavy aircraft and light aircraft, but also rotorcraft such as helicopters and autogyros. In addition, the aircraft station device (or the aircraft equipped with the aircraft station device) can be an unmanned aircraft such as a drone (Aerial Vehicle). In addition, when the aircraft station device functions as a UE (User Equipment), the aircraft station device can be an aerial UE (Aerial UE).

[0134] The term "unmanned aerial vehicle" also encompasses unmanned aerial systems (UAS) and tethered UAS. Furthermore, the term "unmanned aerial vehicle" encompasses light unmanned aerial systems (LTA) and heavy unmanned aerial systems (HTA). Furthermore, the term "unmanned aerial vehicle" encompasses high-altitude UAS platforms (HAPs).

[0135] A satellite station device is a wireless communication device capable of floating outside the atmosphere. It can be carried on a mobile space vehicle such as an artificial satellite, or it can be the mobile space vehicle itself. The satellite serving as the satellite station device can be any of a low Earth orbit (LEO), medium Earth orbit (MEO), geostationary Earth orbit (GEO), or highly elliptical orbit (HEO). Of course, the satellite station device can also be carried on a LEO, MEO, geostationary, or HEO satellite.

[0136] The coverage area of ​​base station apparatus 20 can be as large as a macrocell or as small as a picocell. Of course, the coverage area of ​​base station apparatus 20 can also be as extremely small as a femtocell. Furthermore, base station apparatus 20 may have beamforming capabilities. In this case, base station apparatus 20 can form a cell or service area for each beam.

[0137] The cell provided by the base station device 20 is called a serving cell. The serving cell may include a pCell (Primary Cell) and an sCell (Secondary Cell). When dual connectivity is provided to a UE (e.g., a terminal device 40), the pCell and sCell(s) provided by the master node (MN: Master Node) are called a master cell group. Examples of dual connectivity include EUTRA-EUTRA dual connectivity, EUTRA-NR dual connectivity (ENDC), EUTRA-NR dual connectivity with 5GC, NR-EUTRA dual connectivity (NEDC), and NR-NR dual connectivity.

[0138] Moreover, the serving cell may include a PSCell (Primary Secondary Cell or Primary SCG Cell). That is, when dual connectivity is provided to the UE, the PSCell and sCell(s) provided by the SN (Secondary Node) are called an SCG (Secondary Cell Group).

[0139] One downlink component carrier (Downlink Component Carrier) and one uplink component carrier (Uplink Component Carrier) can correspond to one cell. In addition, the system bandwidth corresponding to one cell can be divided into multiple frequency band parts (BWP: Bandwidth Part). In this case, one or more BWPs can also be set for the UE, and one BWP is used as an active BWP (Active BWP) for the UE. In addition, for each cell, each component carrier or each BWP, the wireless resources (such as frequency band, parameters (Numerology) (subcarrier spacing), time slot format (Slot configuration)) that the terminal device 40 can use can be different. In addition, one base station device can provide multiple cells.

[0140] exist Figure 8 In the example of , the base station device 201 can perform wireless communication with the terminal device 40. Similarly, the base station device 202 can perform wireless communication with the terminal device 40.

[0141] (Terminal device)

[0142] The terminal device 40 is a wireless communication device that wirelessly communicates with the base station device 20. The terminal device 40 is, for example, a portable phone, a smart device (smartphone or tablet), a PDA (Personal Digital Assistant), or a personal computer. In addition, the terminal device 40 can be a device such as a professional camera with a communication function, or a motorcycle or a mobile transfer vehicle equipped with a communication device such as an FPU (Field Pickup Unit). In addition, the terminal device 40 can also be an M2M (Machine to Machine) device or an IoT (Internet of Things) device. The terminal device 40 is sometimes also referred to as, for example, an MTC UE, NB-IoT UE, or Cat.MUE. In addition, the terminal device 40 can also be referred to as an MS (Mobile Station) or a WTRU (Wireless Transmission Reception Unit).

[0143] In addition, the terminal device 40 may be capable of sidelink communication with other terminal devices 40. The terminal device 40 may be capable of using automatic retransmission technologies such as HARQ when performing sidelink communication. The terminal device 40 may be capable of NOMA communication with the base station device 20. In addition, the terminal device 40 may also be capable of NOMA communication in communication (sidelink) with other terminal devices 40. In addition, the terminal device 40 may be capable of LPWA communication with other communication devices (such as the base station device 20 and other terminal devices 40). In addition, the wireless communication used by the terminal device 40 may be wireless communication using millimeter waves. In addition, the wireless communication (including sidelink communication) used by the terminal device 40 may be wireless communication using radio waves, or may be wireless communication using infrared rays or visible light (optical wireless).

[0144] In addition, the terminal device 40 can be a mobile device. Here, the mobile device is a wireless communication device that can move. In this case, the terminal device 40 can be a wireless communication device provided on a mobile body, or it can be the mobile body itself. For example, the terminal device 40 can be a vehicle (Vehicle) that moves on the road, such as a car, bus, truck, motorcycle, or a wireless communication device mounted on the vehicle. In addition, the mobile body can be a mobile terminal, or it can be a mobile body that moves on land (above ground in a narrow sense), underground, on water, or underwater. In addition, the mobile body can be a mobile body that moves in the atmosphere, such as a drone (Aerial UE), a helicopter, or a mobile body that moves outside the atmosphere, such as an artificial satellite.

[0145] The terminal device 40 can communicate by connecting to multiple base station devices or multiple cells at the same time. For example, when one base station device can provide multiple cells, the terminal device 40 uses a certain cell as PCell and other cells as SCell to perform carrier aggregation. In addition, when multiple base station devices 20 can respectively provide one or more cells, the terminal device 40 uses one or more cells managed by one base station device (MN (such as MeNB or MgNB)) as PCell or PCel and SCell(s), and uses one or more cells managed by another base station device (SN (such as SeNB or SgNB)) as PSCell or PSCell and SCell(s) to achieve DC (Dual Connectivity). DC can also be called MC (Multi Connectivity).

[0146] Furthermore, when a communication area is supported by cells of different base station apparatuses 20 (multiple cells having different cell identifiers or the same cell identifier), carrier aggregation (CA), dual connectivity (DC), or multi-connectivity (MC) technology can be used to bundle these multiple cells together to enable communication between the base station apparatus 20 and the terminal apparatus 40. Alternatively, coordinated multi-point transmission and reception (CoMP) technology can be used via the cells of different base station apparatuses 20, allowing the terminal apparatus 40 to communicate with these multiple base station apparatuses 20.

[0147] In addition, the terminal device 40 is not necessarily a device that is directly used by people. As in the so-called MTC (Machine Type Communication), the terminal device 40 may be a sensor installed in a machine in a factory, etc. In addition, the terminal device 40 may be an M2M (Machine to Machine) device or an IoT (Internet of Things) device. In addition, the terminal device 40 may be a device with a relay communication function, as represented by D2D (Device to Device) and V2X (Vehicle to everything). In addition, the terminal device 40 may be a device called CPE (Client Premises Equipment) used in wireless backhaul, etc.

[0148] The following describes in detail the configuration of each device constituting the communication system 1 according to the embodiment. The configuration of each device shown below is merely an example, and the configuration of each device may be different from the configuration shown below.

[0149] <2-2. Configuration of Management Device>

[0150] Figure 9 This is a diagram showing an example of the structure of a management device according to an embodiment of the present disclosure. The management device 10 is a device for managing a wireless network. The management device 10 includes a communication unit 11, a storage unit 12, and a control unit 13. Figure 9 The structure shown is a functional structure, and the hardware structure may be different. In addition, the functions of the management device 10 can be distributed and installed in multiple physically separate structures. For example, the management device 10 can be composed of multiple server devices.

[0151] The communication unit 11 is a communication interface for communicating with other devices. The communication unit 11 can be a network interface or a device connection interface. For example, the communication unit 11 can be a LAN (Local Area Network) interface such as a NIC (Network Interface Card), or a USB interface composed of a USB (Universal Serial Bus) host controller, a USB port, etc. In addition, the communication unit 11 can be a wired interface or a wireless interface. The communication unit 11 functions as a communication unit of the management device 10. The communication unit 11 communicates with the base station device 20 under the control of the control unit 13.

[0152] The storage unit 12 is a storage device that can read and write data, such as DRAM (Dynamic Random Access Memory), SRAM (Static Random Access Memory), flash memory, or a hard disk. The storage unit 12 functions as a storage unit of the management device 10. The storage unit 12 stores, for example, the connection status of the terminal device 40. For example, the storage unit 12 stores the status of RRC (Radio Resource Control) and ECM (EPS Connection Management) of the terminal device 40. The storage unit 12 can function as an internal memory (Home Memory) that stores the location information of the terminal device 40.

[0153] The control unit 13 is a controller that controls various parts of the management device 10. The control unit 13 is implemented by a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). For example, the control unit 13 is implemented by the processor using RAM (Random Access Memory) or the like as a workspace to execute various programs stored in a storage device within the management device 10. In addition, the control unit 13 can be implemented by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). CPUs, MPUs, ASICs, and FPGAs can all be considered controllers.

[0154] <2-3. Configuration of Base Station Device>

[0155] Next, the configuration of the base station apparatus 20 will be described. Figure 10 This figure illustrates an example of the configuration of a base station device according to an embodiment of the present disclosure. Base station device 20 is capable of simultaneously transmitting and receiving data using the same frequency band. For example, base station device 20 is capable of performing full-duplex communication within the frequency band with other wireless communication devices, such as terminal device 40. Alternatively, base station device 20 may be capable of performing NOMA communication with other wireless communication devices.

[0156] The base station device 20 includes a communication unit 21, a storage unit 22, a network communication unit 23, and a control unit 24. Figure 10 The structure shown is a functional structure, and the hardware structure may be different from this. In addition, the functions of the base station device 20 may be dispersed into a plurality of physically separate structures and implemented.

[0157] The communication unit 21 is a signal processing unit for wireless communication with other wireless communication devices (such as the terminal device 40 and other base station devices 20). The communication unit 21 can use the same frequency band to simultaneously send and receive data. For example, the base station device 20 can perform full-duplex communication within the frequency band with other communication devices such as the terminal device 40. The communication unit 21 operates in accordance with the control of the control unit 24. The communication unit 21 adapts to one or more wireless access methods. For example, the communication unit 21 adapts to both NR and LTE. In addition to NR and LTE, the communication unit 21 can also adapt to W-CDMA and cdma2000. In addition, the communication unit 21 can also handle communications using NOMA.

[0158] The communication unit 21 includes a reception processing unit 211, a transmission processing unit 212, and an antenna 214. The communication unit 21 may include multiple reception processing units 211, transmission processing units 212, and antennas 214. Furthermore, if the communication unit 21 supports multiple radio access methods, each component of the communication unit 21 may be configured independently for each radio access method. For example, the reception processing unit 211 and the transmission processing unit 212 may be configured independently for LTE and NR.

[0159] The reception processing unit 211 processes an uplink signal received via the antenna 214. The reception processing unit 211 includes a wireless reception unit 211a, a demultiplexing unit 211b, a demodulation unit 211c, and a decoding unit 211d.

[0160] The wireless receiving unit 211a down-converts the uplink signal, removes unnecessary frequency components, controls the amplification level, performs orthogonal demodulation, converts it to a digital signal, removes the guard interval (cyclic prefix), and extracts the frequency domain signal based on the fast Fourier transform. The demultiplexing unit 211b separates uplink channels such as PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel) and uplink reference signals from the signal output from the wireless receiving unit 211a. The demodulation unit 211c demodulates the received signal using modulation methods such as BPSK (Binary Phase Shift Keying) and QPSK (Quadrature Phase Shift Keying) for the modulation symbols of the uplink channel. The modulation method used by the demodulation unit 211c can be 16QAM (Quadrature Amplitude Modulation), 64QAM, or 256QAM. In this case, the signal points on the constellation are not necessarily equidistant. The constellation may be a non-uniform constellation (NUC). The decoding unit 211d decodes the coded bits of the demodulated uplink channel. The decoded uplink data and uplink control information are output to the control unit 24.

[0161] The transmission processing unit 212 performs transmission processing of downlink control information and downlink data. The transmission processing unit 212 includes a coding unit 212a, a modulation unit 212b, a multiplexing unit 212c, and a wireless transmission unit 212d.

[0162] The coding unit 212a encodes the downlink control information and downlink data input from the control unit 24 using coding methods such as block coding, convolutional coding, and turbo coding. In addition, the coding unit 212a can perform coding based on polar code (Polar code) or coding based on LDPC code (Low Density Parity Check Code). The modulation unit 212b modulates the coded bits output from the coding unit 212a using a prescribed modulation method such as BPSK, QPSK, 16QAM, 64QAM, 256QAM, etc. In this case, the signal points on the constellation diagram are not necessarily equidistant. The constellation diagram can be a non-uniform constellation diagram. The multiplexing unit 212c multiplexes the modulation symbols of each channel with the downlink reference signal and allocates them to prescribed resource elements. The wireless transmission unit 212d performs various signal processing on the signal from the multiplexing unit 212c. For example, the wireless transmission unit 212d performs processing such as conversion to the time domain using a fast Fourier transform, addition of a guard interval (cyclic prefix), generation of a baseband digital signal, conversion to an analog signal, orthogonal modulation, up-conversion, removal of unnecessary frequency components, and power amplification. The signal generated by the transmission processing unit 212 is transmitted from the antenna 214.

[0163] The storage unit 22 is a storage device capable of reading and writing data, such as a DRAM, an SRAM, a flash memory, or a hard disk. The storage unit 22 functions as a storage unit of the base station apparatus 20 .

[0164] The network communication unit 23 is a communication interface for communicating with a higher-level node on the network (e.g., the management device 10). For example, the network communication unit 23 is a LAN interface such as a NIC. The network communication unit 23 can be a wired interface or a wireless interface. The network communication unit 23 functions as the network communication unit of the base station device 20.

[0165] The control unit 24 is a controller that controls various components of the base station apparatus 20. The control unit 24 is implemented by a processor (hardware processor) such as a CPU or MPU. For example, the control unit 24 is implemented by the processor using RAM or the like as a workspace and executing various programs stored in a storage device within the base station apparatus 20. Alternatively, the control unit 24 can be implemented by an integrated circuit such as an ASIC or FPGA. CPUs, MPUs, ASICs, and FPGAs can all be considered controllers.

[0166] <2-4. Configuration of Terminal Device>

[0167] Next, the configuration of the terminal device 40 will be described. Figure 11This figure illustrates an example of the configuration of a terminal device according to an embodiment of the present disclosure. Terminal device 40 is capable of simultaneously transmitting and receiving data using the same frequency band. For example, terminal device 40 is capable of performing full-duplex communication within the frequency band with other wireless communication devices, such as base station device 20. Alternatively, terminal device 40 may be capable of performing NOMA communication with other wireless communication devices.

[0168] The terminal device 40 includes a communication unit 41, a storage unit 42, a network communication unit 43, an input / output unit 44, and a control unit 45. Figure 11 The structure shown is a functional structure, and the hardware structure may be different from this. In addition, the functions of the terminal device 40 can be dispersed into multiple physically separate structures for installation. In addition, in the structure of the terminal device 40, the network communication unit 43 and the input / output unit 44 may not be essential components.

[0169] The communication unit 41 is a signal processing unit for wireless communication with other wireless communication devices (such as the base station device 20 and other terminal devices 40). The communication unit 41 can use the same frequency band to simultaneously send and receive data. For example, the communication unit 41 can perform full-duplex communication within the frequency band with other communication devices such as the base station device 20 and the terminal device 40. The communication unit 41 operates in accordance with the control of the control unit 45. The communication unit 41 adapts to one or more wireless access methods. For example, the communication unit 41 adapts to both NR and LTE. In addition to NR and LTE, the communication unit 41 can also adapt to W-CDMA and cdma2000. In addition, the communication unit 41 can handle communications using NOMA.

[0170] The communication unit 41 includes a reception processing unit 411, a transmission processing unit 412, and an antenna 414. The communication unit 41 may include multiple reception processing units 411, transmission processing units 412, and antennas 414. The configurations of the communication unit 41, reception processing unit 411, transmission processing unit 412, and antenna 414 are similar to those of the communication unit 21, reception processing unit 211, transmission processing unit 212, and antenna 214 of the base station apparatus 20.

[0171] The storage unit 42 is a data storage device such as DRAM, SRAM, flash memory, or a hard disk. The storage unit 42 functions as a storage unit for the terminal device 40. The storage unit 42 stores the configuration information received from the base station device 20. The configuration information will be described in detail later.

[0172] The network communication unit 43 is a communication interface for communicating with higher-level nodes on the network. For example, the network communication unit 43 is a LAN interface such as a NIC. The network communication unit 43 can be a wired interface or a wireless interface. The network communication unit 43 functions as the network communication unit of the terminal device 40. The network communication unit 43 communicates with other devices under the control of the control unit 45.

[0173] The input / output unit 44 is a user interface for exchanging information with the user. For example, the input / output unit 44 is an operating device such as a keyboard, a mouse, an operation key, a touch panel, etc. for the user to perform various operations. Alternatively, the input / output unit 44 is a display device such as a liquid crystal display (LCD) or an organic EL display (OLED). The input / output unit 44 can be an audio device such as a speaker or a buzzer. In addition, the input / output unit 44 can also be a lighting device such as an LED (Light Emitting Diode) lamp. The input / output unit 44 functions as an input / output unit (input unit, output unit, operation unit, or notification unit) of the terminal device 40.

[0174] The control unit 45 is a controller that controls various components of the terminal device 40. The control unit 45 is implemented by a processor (hardware processor) such as a CPU or MPU. For example, the control unit 45 is implemented by the processor using RAM or other memory as a workspace and executing various programs stored in a storage device within the terminal device 40. Alternatively, the control unit 45 can be implemented by an integrated circuit such as an ASIC or FPGA. CPUs, MPUs, ASICs, and FPGAs can all be considered controllers.

[0175] <<3. Communication System Operation>>

[0176] The configuration of the communication system 1 has been described above. Next, the operation of the communication system 1 will be described.

[0177] In this embodiment, to reduce the frequency and time resource overhead of RACH opportunities in random access, multiple beams of the base station apparatus 20, that is, the corresponding SSBs, are associated with multiple (e.g., two) RACH opportunities. The following description uses the example of associating two beams (SSBs) with two RACH opportunities. In this case, three scenarios are listed as examples of the association method. In the following description, RACH opportunities are sometimes referred to as RACH OCs.

[0178] <3-1. Relationship with RACH Timing>

[0179] Figure 12 This figure shows an example where the RACH opportunities of two beams completely overlap. Figure 12 As shown, Beam(0) is associated with (allocated to) RACH OC(0) and RACH OC(1), and Beam(1) is similarly associated with RACH OC(0) and RACH OC(1).

[0180] When the terminal device 40 receives two DL beams from multiple DL beams (Downlink beam) at a value greater than the specified received power (e.g., RSRP), the two received DL beams are reported. At this time, the RACH opportunities associated with the two received DL beams are sometimes the same. In this case, because there are two RACH opportunities, the terminal device 40 sends a preamble for each DL beam in each RACH opportunity. Accordingly, the terminal device 40 can notify the base station device 20 side that the two DL beams are desired by the terminal device 40. In addition, in this example, the multiple RACH opportunities used by the terminal device 40 to perform beam reporting to the base station device 20 may be multiple RACH opportunities within one PRACH time slot.

[0181] By dividing the RACH opportunity in this way, there is no problem even if the terminal device 40 can only transmit the preamble using one beam at a time. Furthermore, the association of multiple DL beams with RACH opportunities can be done in other ways. For example, by associating multiple (eight) DL beams with one RACH opportunity and preparing two sets, the frequency and time resources required for the RACH opportunity can be reduced to one-quarter compared to normal. Furthermore, in this case, even if reports corresponding to two DL beams associated with the same RACH opportunity need to be made simultaneously, these reports can be made without conflict.

[0182] Regarding which of the two RACH opportunities corresponding to the reported beam is used to transmit the preamble, various scenarios can be considered. For example, when there is only one beam to report, the following three modes are used for setting. (Mode 1) The preamble is transmitted using the first of the two RACH opportunities. (Mode 2) The preamble is transmitted using the last of the two RACH opportunities. (Mode 3) The network determines which of the two RACH opportunities is used to transmit the preamble.

[0183] In addition, for example, when there are two beams to be reported, the beam with a smaller resource number (e.g., SSB Index) of the SSB of the beam to be reported (earlier in time and lower in frequency) is associated with (allocated to) the RACH opportunity with a smaller resource number (e.g., RACH opportunity identifier) ​​of the RACH opportunity (earlier in time and lower in frequency).

[0184] In this embodiment, multiple RACH opportunities are allocated to a single beam, but the goal is not to transmit the same beam's preamble in multiple RACH opportunities. The goal is to minimize the situation where a single terminal device 40 transmits preambles using beams pointing in different directions in the same RACH opportunity, while also reducing RACH opportunity resources. In other words, the frequency and time resources required for RACH opportunities are reduced while enabling appropriate beam reporting.

[0185] Next, the classification of the three types of association methods will be described. The classification of the three types of association methods is performed based on the setting information received by the terminal device 40 from the base station device 20 .

[0186] In some embodiments, the three types of association schemes are distinguished using the first information element and the second information element included in the configuration information. The second information element is information regarding overlap between the first and second RACH opportunities in the frequency domain, time domain, or both. Furthermore, the second information element is configured with an indication indicating the distinction between the three types of situations. The first type is an indication indicating that the first and second RACH opportunities completely overlap (full-overlap). The second type is an indication indicating that the first and second RACH opportunities partially overlap (partial-overlap). The third type is an indication indicating that the first and second RACH opportunities do not overlap (non-overlap). Furthermore, the first information element is information indicating that multiple beams (SSBs) are mapped to both the first and second RACH opportunities.

[0187] Next, we will explain the three cases (modes) of association between multiple beams (beamformed SSBs) and multiple RACH opportunities. Figure 13 and Figure 14 The following describes the pattern of association between multiple beams (beamformed SSBs) and multiple RACH opportunities in the case of full overlap. Figure 13This is a diagram showing an example of mapping when IE:msg1-FDM is "1" and completely overlapped. IE:msg1-FDM indicates the number of PRACH occasions in the frequency direction. Figure 13 In the example, in the time domain, the first PRACH opportunity (RO#1) is associated with the preambles (0) to (3) of SSB#0 and #1 corresponding to the two beams. In addition, the second PRACH opportunity (RO#2) is associated with the preambles (4) to (7) of SSB#0 and #1 corresponding to the two beams.

[0188] In 3GPP Rel.15 TS38.331, ssb-perRACH-OccasionAndCB-PreamblesPerSSB can be set to "1 / 2". That is, one SSB is associated with two RACH occasions. Figure 13 In the example, not only SSB#0 but also SSB#1 corresponds to the same two RACH opportunities. Therefore, multiple ssb-perRACH-OccasionAndCB-PreamblesPerSSB are defined as a list (e.g., IE "ssb-perRACH-OccasionAndCB-PreamblesPerSSBList"), and the corresponding associated mode (e.g., IE "MultipleRACH-OccasionsOverlap") is defined as "full-Overlap". In addition, Figure 13 In the , the number of preambles per SSB "preamblesPerSSB" is set to "n8". Figure 13 In the RACH, 6 RACH opportunities can be included in 1 PRACH slot.

[0189] Figure 14 This is a diagram showing an example of mapping when IE msg1-FDM is "4" and completely overlapped. Figure 14 In the example, the PRACH opportunity (RO#1) in the first time direction is further divided into four opportunities in the frequency direction, and each preamble corresponding to SSB#0 and #1 is associated. In other words, the PRACH opportunity (RO#1) in the time direction includes opportunities with preambles (0) to (3) associated with SSB#0 and #1, respectively. Similarly, the PRACH opportunity (RO#2) in the second time direction includes opportunities with preambles (4) to (7) associated with SSB#0 and #1, respectively.

[0190] As mentioned above, in 3GPP Rel.15 TS38.331, ssb-perRACH-OccasionAndCB-PreamblesPerSSB can be set to "1 / 8". That is, one SSB is associated with two RACH opportunities in the time direction (including 8 RACH opportunities in the frequency direction). Figure 14 In the RACH, not only SSB#0 but also SSB#1 is associated with the same two RACH opportunities in the time direction (including 8 RACH opportunities in the frequency direction). Therefore, multiple ssb-perRACH-OccasionAndCB-PreamblesPerSSB are defined as a list (for example, IE "ssb-perRACH-OccasionAndCB-PreamblesPerSSBList"), and the corresponding associated mode (for example, IE "MultipleRACH-OccasionsOverlap") is defined as "full-Overlap". In addition, Figure 14 In the , the number of preambles per SSB "preamblesPerSSB" is also set to "n8". Figure 14 In the RACH, 6 RACH opportunities in the time direction can be included in 1 PRACH slot.

[0191] Next, use Figures 15 to 17 The following describes the association pattern between multiple beams (beamformed SSBs) and multiple RACH opportunities in the case of partial overlap. Figure 15 This figure shows an example of a case where the RACH opportunities of two beams partially overlap. Figure 15 As shown, Beam(0) is associated with (allocated to) RACH OC(0) and RACH OC(1) in the time direction, and Beam(1) is associated with RACH OC(1) and RACH OC(2) in the time direction. In other words, RACH OC(1) in the time direction overlaps Beam(0) and Beam(1).

[0192] Figure 16 This is a diagram showing an example of mapping when IE:msg1-FDM is "1" and partially overlaps. Figure 16In the example, in the time direction (time domain), the first PRACH opportunity (RO#1) is associated with the preambles (0) to (3) of SSB#0 corresponding to the first beam. In addition, the preambles (4) to (7) of SSB#0 and the preambles (0) to (3) of SSB#1 corresponding to the two beams are associated with the PRACH opportunity (RO#2) in the second time direction. In addition, the preambles (4) to (7) of SSB#1 corresponding to the second beam are associated with the PRACH opportunity (RO#3) in the third time direction.

[0193] As mentioned above, in 3GPP Rel.15 TS38.331, ssb-perRACH-OccasionAndCB-PreamblesPerSSB can be set to "1 / 2". That is, one SSB is associated with two RACH opportunities. Figure 16 In RO#2, not only SSB#0 but also SSB#1 is associated with the same RACH opportunity. Therefore, multiple ssb-perRACH-OccasionAndCB-PreamblesPerSSB are defined as a list (e.g., IE "ssb-perRACH-OccasionAndCB-PreamblesPerSSBList"), and the corresponding associated mode (e.g., IE "MultipleRACH-OccasionsOverlap") is defined as "partial-Overlap". In addition, Figure 16 In the , the number of preambles per SSB "preamblesPerSSB" is also set to "n8". Figure 16 In the RACH, 6 RACH opportunities in the time direction can be included in 1 PRACH slot.

[0194] Figure 17 This is a diagram showing an example of mapping when IE:msg1-FDM is "4" and partially overlaps. Figure 17 In the example, the PRACH opportunity (RO#1) in the first time direction is further divided into four opportunities in the frequency direction, and is associated with each preamble of SSB#0 corresponding to the first beam. That is, the PRACH opportunity (RO#1) in the time direction includes opportunities associated with preambles (0) to (3) of SSB#0, respectively. In addition, the PRACH opportunity (RO#2) in the second time direction includes opportunities associated with preambles (4) to (7) of SSB#0 and preambles (0) to (3) of SSB#1, respectively. In addition, the PRACH opportunity (RO#3) in the third time direction includes opportunities associated with preambles (4) to (7) of SSB#1, respectively.

[0195] As mentioned above, in 3GPP Rel.15 TS38.331, ssb-perRACH-OccasionAndCB-PreamblesPerSSB can be set to "1 / 8". That is, one SSB is associated with two RACH opportunities in the time direction (including 8 RACH opportunities in the frequency direction). Figure 17 In RO#2 in the time direction (including 4 RACH opportunities in the frequency direction), not only SSB#0 but also SSB#1 is associated with the same RACH opportunity. Therefore, multiple ssb-perRACH-OccasionAndCB-PreamblesPerSSB are defined as a list (for example, IE "ssb-perRACH-OccasionAndCB-PreamblesPerSSBList"), and the corresponding associated mode (for example, IE "MultipleRACH-OccasionsOverlap") is defined as "partial-Overlap". In addition, Figure 17 In the , the number of preambles per SSB "preamblesPerSSB" is also set to "n8". Figure 17 In the RACH, six RACH opportunities in the time direction can be included in one PRACH slot.

[0196] Next, use Figure 18 and Figure 19 The pattern of the association between multiple beams (beamformed SSBs) and multiple RACH opportunities in the non-overlap state will be described. Figure 18 This figure shows an example when the RACH timings of two beams do not overlap. Figure 18 As shown, Beam(0) is associated with (allocated to) RACH OC(0) and RACH OC(1), and Beam(1) is associated with RACH OC(2) and RACH OC(3). In other words, RACH opportunities do not overlap between Beam(0) and Beam(1).

[0197] Figure 19 This is a diagram showing an example of mapping when the IE msg1-FDM is "4" and does not overlap. Figure 19In the example, the PRACH opportunity (RO#0) in the first time direction is further divided into four opportunities in the frequency direction, and is associated with each preamble of SSB#0 corresponding to the first beam. That is, the PRACH opportunity (RO#0) includes opportunities with preambles (0) to (3) of SSB#0, respectively. In addition, the second PRACH opportunity (RO#1) includes opportunities with preambles (4) to (7) of SSB#0, respectively. Similarly, the third PRACH opportunity (RO#2) includes opportunities with preambles (0) to (3) of SSB#1, respectively. In addition, the fourth PRACH opportunity (RO#3) includes opportunities with preambles (4) to (7) of SSB#1, respectively. In addition, the fifth PRACH opportunity (RO#4) and the sixth PRACH opportunity (RO#5) also correspond to SSB#2.

[0198] As mentioned above, in 3GPP Rel.15 TS38.331, ssb-perRACH-OccasionAndCB-PreamblesPerSSB can be set to "1 / 8". That is, one SSB is associated with two RACH opportunities in the time direction (including 8 RACH opportunities in the frequency direction). Figure 19 In the , not only SSB#0, but also SSB#1 and SSB#2 are associated with the RACH opportunities in the two time directions (including 8 RACH opportunities in the frequency direction). Therefore, multiple ssb-perRACH-OccasionAndCB-PreamblesPerSSB are defined as a list (for example, IE "ssb-perRACH-OccasionAndCB-PreamblesPerSSBList"), and the corresponding associated mode (for example, IE "MultipleRACH-OccasionsOverlap") is defined as "non-Overlap". In addition, Figure 19 In the , the number of preambles per SSB "preamblesPerSSB" is also set to "n8". Figure 19 In the RACH, 6 RACH opportunities can be included in 1 PRACH slot.

[0199] use Figures 13-19 The association pattern between multiple beams (beamformed SSBs) and multiple RACH opportunities can be explained using Figure 20 The parameters are defined as RRC parameters in the ASN.1 format shown in the figure. Figure 20In the IE:ssb-RACH-OccasionConfig, the association between one or more SSBs and one or more RACH opportunities is indicated. The IE:ssb-RACH-OccasionConfig may include the IE:ssb-perRACH-OccasionAndCB-PreamblesPerSSBList and the IE:multipleRACH-OccasionsOverlap. The IE:ssb-perRACH-OccasionAndCB-PreamblesPerSSBList may include one or more IE:ssb-perRACH-OccasionAndCB-PreamblesPerSSB. The IE:multipleRACH-OccasionsOverlap may be set only when the IE:ssb-perRACH-OccasionAndCB-PreamblesPerSSBList includes multiple ssb-perRACH-OccasionAndCB-PreamblesPerSSBs.

[0200] In addition, the IE: multipleRACH-OccasionsOverlap indicates the overlap pattern associated with multiple RACH opportunities mapped to multiple SSBs and indicated by one or more IEs in ssb-perRACH-OccasionAndCB-PreamblesPerSSBList. "Value full-Overlap" indicates that all multiple RACH opportunities completely overlap. "Value partial-Overlap" indicates that at least a portion of the multiple RACH opportunities partially overlap with other portions of the multiple RACH opportunities. "Value non-Overlap" indicates that two RACH opportunities do not overlap.

[0201] Next, the communication control process of random access according to this embodiment will be described. Figure 21 1 is a sequence diagram showing an example of a communication control process according to an embodiment of the present disclosure. Figure 21As shown, the base station device 20 notifies the terminal device 40 of the relationship between multiple DL beams and two RACH opportunities, that is, the configuration related to the three situations (modes) of the association method (corresponding association) (step S101). The notification of the setting can be performed through the various signalings mentioned above. For example, the notification of the setting can be performed through an RRC message sent from the base station device 20 (for example, SystemInformationType X (SIBX) message (SIBX message), RRCSetup message (RRCSetup message), RRCReconfiguration message (RRCReconfiguration message)). Further or alternatively, the notification of the setting can also be performed by sending a MAC CE (MAC Control Element, MAC control element) or DCI sent from the base station device 20. Further or alternatively, the notification of the setting can be performed through a combination of an RRC message and a DCI. For example, an RRC message can be used to send an IE:ssb-perRACH-OccasionAndCB-PreamblesPerSSBList showing the corresponding association (Association) between multiple beams (beamformed SSBs) and multiple RACH opportunities, and a DCI can be used to send the corresponding association mode (full-Overlap, partial-Overlap, non-Overlap). In this case, the corresponding association mode (full-Overlap, partial-Overlap, non-Overlap) can be changed and notified for each PRACH slot (PRACH time slot), each subframe (subframe), or each frame.

[0202] Additionally or alternatively, the IE: ssb-perRACH-Occasion may be used to replace the above-mentioned IE: ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

[0203] After notifying the configuration, the base station apparatus 20 performs DL beam scanning (i.e., transmitting multiple SSBs with different SSB indices up to a maximum of Lmax using different beams) (step S102). If one beam (e.g., SSB) is detected, the terminal apparatus 40 reports the preamble (i.e., Random Access Preamble transmission) in the first RACH opportunity. If two beams (e.g., SSBs) are detected, the terminal apparatus 40 reports the preamble in the first and second RACH opportunities associated with the corresponding beams (step S103). This allows for the reduction of the frequency and time resources required for the RACH opportunity and for appropriate beam reporting.

[0204] <3-2. Transmission of the Same Preamble for Two Beams>

[0205] exist Figure 21 In the Random Access Procedure after the communication control processing shown, a response is returned to the terminal device 40. Regarding this response, if the preamble is different, a different response is returned. More specifically, the base station device 20 sends a Random Access Response including an Identifier corresponding to the received (detected) Random Access Preamble to the terminal device 40 that sent the Preamble. Usually, a usable preamble is allocated for each RACH opportunity. Therefore, if it is a different RACH opportunity, the terminal device 40 returns an arbitrarily selected preamble respectively. However, in this case, the process after the response becomes complicated.

[0206] In contrast, in this embodiment, when the terminal apparatus 40 reports multiple preambles corresponding to multiple beams, the same preamble can be used. This is because the base station apparatus 20 does not need to distinguish between preambles reported from a single terminal apparatus 40. In this case, the base station apparatus 20 uses the corresponding two DL beams to transmit subsequent Random Access Responses.

[0207] Figure 22 FIG. 1 is a sequence diagram showing another example of the communication control process according to the embodiment of the present disclosure. Figure 22As shown, the base station apparatus 20 transmits a DL beam for random access to the terminal apparatus 40 (step S201). For example, when the terminal apparatus 40 determines that the received power of two DL beams (e.g., two SSBs) is good, it reports the same preamble (Preamble 1) in the RACH timing (OC1) corresponding to one DL beam (beam1) and the RACH timing (OC2) corresponding to the other DL beam (beam2) (steps S202 and S203).

[0208] The base station apparatus 20 transmits a Random Access Response using two DL beams corresponding to the RACH timing used to transmit the reported preamble (step S204). This prevents the Random Access Response process from becoming complicated. Furthermore, wasteful use of resources such as the preamble sequence can be prevented. Furthermore, since the preambles corresponding to the two DL beams are the same, the Random Access Response for the preamble can be performed in a single transaction, thereby reducing downlink frequency and time resources, as well as latency.

[0209] <3-3. Using the Second RACH Opportunity for UL>

[0210] like Figure 12 As shown in FIG. 1 , when the number of RACH opportunities corresponding to one DL beam increases, even if terminal apparatus 40 no longer transmits a preamble for random access, base station apparatus 20 needs to wait using the receive beam (Rx beam) corresponding to the downlink transmit beam (Tx beam) because there is a possibility that terminal apparatus 40 will transmit a preamble. Therefore, in this case, the increased RACH opportunities become wasted uplink resources.

[0211] In contrast, in this embodiment, when RACH opportunities are duplicated (e.g., full-overlap or non-overlap), if not even a single preamble is received in the initial RACH opportunity, grant-free uplink data transmission is granted to the terminal device 40 in the second RACH opportunity region. This permission is granted by transmitting a broadcast signal from the base station device 20 to the terminal device 40 indicating that grant-free transmission is permitted before the start of the second RACH opportunity. In other words, the resources of the second RACH opportunity are diverted to uplink data transmission. Furthermore, a grant is an instruction from the base station device 20 to the terminal device 40 regarding which resources to use for reception or transmission. Therefore, grant-free means that the terminal device 40 performs uplink transmission without permission from the base station device 20.

[0212] Similarly, by transmitting a downlink assignment signal as a broadcast signal from the base station apparatus 20 to the terminal apparatus 40, resources in the second RACH opportunity can be diverted to downlink data communication. Alternatively, the base station apparatus 20 may transmit a downlink assignment signal to a specific terminal apparatus 40.

[0213] Figure 23 This figure shows an example of transferring the second RACH opportunity to UL. Figure 23 As shown, RACH opportunities typically require space to accommodate preambles from terminal device 40, the reception of which is uncertain. However, duplexing RACH opportunities allows for efficient utilization. Furthermore, RACH opportunities can be reused in both complete and non-overlapping scenarios among the three association schemes. Furthermore, as a prerequisite, it is necessary that when a preamble is transmitted from terminal device 40, it is used continuously from the initial RACH opportunity. This reduces the frequency and time resources used for uplink RACH opportunities, thereby improving the throughput of user data in the normal uplink.

[0214] <<4. Modifications>>

[0215] The above-described embodiment is merely an example, and various modifications and applications are possible.

[0216] Some information elements described in some embodiments (e.g., ssb-RACH-OccasionConfig, ssb-perRACH-OccasionAndCB-PreamblesPerSSBList, and multipleRACH-OccasionsOverlap) may be included in the IE: CellGroupConfig. In other words, some information elements described in some embodiments (e.g., ssb-RACH-OccasionConfig, ssb-perRACH-OccasionAndCB-PreamblesPerSSBList, and multipleRACH-OccasionsOverlap) may be generated by the gNB-DU of the base station apparatus 20 and sent to the gNB-CU of another base station apparatus 20 using the F1AP:DUtoCURRCInformation message. The gNB-CU of another base station apparatus 20 may adopt the information elements in the received F1AP:DUtoCURRCInformation message as is as the RRC configuration to be applied to the terminal apparatus 40, or may take them into account in the RRC configuration to be applied to the terminal apparatus 40.

[0217] Furthermore, the processing device (control device) that controls the management device 10, the base station device 20, or the terminal device 40 of this embodiment may be realized by a dedicated computer system or a general-purpose computer system.

[0218] For example, a communication program for executing the above-described operations is stored on a computer-readable recording medium such as an optical disc, semiconductor memory, magnetic tape, or floppy disk and distributed. Furthermore, the control device is configured by, for example, installing the program on a computer and executing the above-described processing. In this case, the control device can be a device external to the management device 10, base station device 20, or terminal device 40 (e.g., a personal computer). Alternatively, the control device can be a device internal to the management device 10, base station device 20, or terminal device 40 (e.g., control unit 13, control unit 24, or control unit 45).

[0219] Alternatively, the communication program may be stored in advance on a disk device on a server device on a network such as the Internet, allowing it to be downloaded to a computer, etc. Alternatively, the aforementioned functions may be implemented through the collaboration of an OS (Operating System) and application software. In this case, the components other than the OS may be stored on a medium and distributed, or they may be stored in advance on a server device and downloaded to a computer, etc.

[0220] Furthermore, all or part of the processes described in the above embodiments as being automatically performed can also be performed manually, and all or part of the processes described as being manually performed can also be performed automatically using known methods. Furthermore, unless otherwise noted, the process flows, specific names, and information including various data or parameters shown in the above documents and drawings can be arbitrarily modified. For example, the various information shown in the drawings is not limited to the information shown.

[0221] The components of the devices shown in the diagrams are conceptual and functional elements and do not necessarily need to be physically configured as shown. Specifically, the specific form of distribution / integration of the devices is not limited to that shown in the diagrams, and all or part of the components can be functionally or physically distributed / integrated in arbitrary units, depending on various loads, usage conditions, and the like.

[0222] Furthermore, the above-described embodiments can be combined as appropriate within the scope of not contradicting the processing contents. Furthermore, the order of each step shown in the sequence diagram of the above-described embodiment can be changed as appropriate.

[0223] In addition, for example, this embodiment can also be implemented as all structures that constitute a device or system, such as a processor as a system LSI (Large Scale Integration), a module using multiple processors, a unit using multiple modules, a component in which other functions are further added to the unit, etc. (that is, the structure of a part of the device).

[0224] Furthermore, in this embodiment, a system refers to a collection of multiple components (devices, modules (components), etc.), regardless of whether all components are housed in the same housing. Therefore, multiple devices housed in separate housings and connected via a network, as well as a single device containing multiple modules in a single housing, are both systems.

[0225] Furthermore, for example, the present embodiment can adopt a cloud computing configuration in which a single function is shared by a plurality of devices via a network and processes the function in a coordinated manner.

[0226] 5. Summary

[0227] As described above, according to one embodiment of the present disclosure, a terminal device 40 is a terminal device comprising a wireless transceiver (communication unit 41) and a circuit (control unit 45) that receives configuration information from a base station (base station device 20) via the wireless transceiver. The configuration information includes: one or more first information elements indicating that a plurality of beamformed SSBs are mapped to both a first plurality of RACH opportunities and a second plurality of RACH opportunities; and a second information element indicating whether the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or both. One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element. The circuit is configured to transmit a first preamble in at least a first RACH opportunity associated with a first SSB among the plurality of SSBs in the first plurality of RACH opportunities, and to transmit a second preamble in a second RACH opportunity associated with a second SSB among the plurality of SSBs in the second plurality of RACH opportunities, based on the configuration information. The first RACH timing and the second RACH timing are different timings in the frequency domain, the time domain, or both the frequency domain and the time domain. As a result, the frequency and time resources of beam scanning can be reduced.

[0228] The three situations are indicated by a symbol indicating that the first plurality of RACH opportunities completely overlap with the second plurality of RACH opportunities, a symbol indicating that the first plurality of RACH opportunities partially overlap with the second plurality of RACH opportunities, and a symbol indicating that the first plurality of RACH opportunities do not overlap with the second plurality of RACH opportunities. As a result, the frequency and time resources required for beam scanning can be reduced.

[0229] If a flag indicating that the first and second RACH opportunities completely overlap or a flag indicating that the first and second RACH opportunities do not overlap is set, and the base station (base station device 20) does not detect preamble reception in the first of the first and second RACH opportunities, and if a broadcast signal indicating a grant or grant-free is received from the base station before the start of the second or subsequent RACH opportunities, the terminal device 40 diverts the resources of the second or subsequent RACH opportunities for uplink data transmission. This reduces the frequency and time resources of the uplink RACH opportunities, thereby improving the throughput of normal uplink user data.

[0230] The broadcast signal is an assignment signal for the downlink, and the terminal device 40 diverts the resources of the second and subsequent RACH opportunities to downlink data transmission. As a result, the throughput of downlink user data can be improved.

[0231] The circuit transmits the same preamble in the first preamble and the second preamble. As a result, it is possible to prevent the Random Access Response process from becoming complicated.

[0232] While the various embodiments of the present disclosure have been described above, the technical scope of the present disclosure is not limited to the aforementioned embodiments, and various modifications can be made without departing from the scope of the present disclosure. Furthermore, the constituent elements of the various embodiments and modifications can be appropriately combined.

[0233] Furthermore, the effects of each embodiment described in this specification are merely illustrative and non-limiting, and other effects may also be present.

[0234] In addition, the present technology can also adopt the following structures.

[0235] (1) A terminal device comprising:

[0236] wireless transceiver; and

[0237] circuit, receives setting information from a base station via the wireless transceiver,

[0238] The setting information includes:

[0239] One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and

[0240] The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain.

[0241] One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element,

[0242] The circuit is configured to: based on the setting information, at least

[0243] transmitting a first preamble in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities,

[0244] transmitting a second preamble in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities,

[0245] The first RACH timing and the second RACH timing are timings different from each other in the frequency domain, the time domain, or the frequency domain and the time domain.

[0246] (2) The terminal device according to (1), wherein:

[0247] The three situations are represented by the following symbols:

[0248] an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities completely overlap with each other;

[0249] an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities partially overlap with each other; and

[0250] A flag indicating that the first plurality of RACH opportunities do not overlap with the second plurality of RACH opportunities.

[0251] (3) The terminal device according to (2), wherein:

[0252] When a flag indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities completely overlap with each other or a flag indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities do not overlap with each other is set,

[0253] In a case where the base station does not detect reception of a preamble in the first RACH opportunity among the first plurality of RACH opportunities and the second plurality of RACH opportunities, upon receiving a broadcast signal transmitted from the base station indicating that a grant (grant) or grant free (grant exemption) can be transmitted before the start of the second and subsequent RACH opportunities, the base station diverts resources of the second and subsequent RACH opportunities for uplink data transmission.

[0254] (4) The terminal device according to (3), wherein:

[0255] The broadcast signal is an assignment signal given to the downlink.

[0256] The resources of the second and subsequent RACH opportunities are used for downlink data transmission.

[0257] (5) The terminal device according to any one of (1) to (4), wherein:

[0258] The circuit transmits the same preamble in the first preamble and the second preamble.

[0259] (6) A base station comprising:

[0260] wireless transceiver; and

[0261] circuit, sending setting information to the terminal device via the wireless transceiver,

[0262] The setting information includes:

[0263] One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and

[0264] The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain.

[0265] One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element,

[0266] From the terminal device, based on the setting information, at least

[0267] receiving a first preamble transmitted in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities,

[0268] receiving a second preamble transmitted in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities,

[0269] The first RACH timing and the second RACH timing are timings different from each other in the frequency domain, the time domain, or the frequency domain and the time domain.

[0270] (7) A communication control method in which a processor executes receiving setting information from a base station via a wireless transceiver, in which:

[0271] The setting information includes:

[0272] One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and

[0273] The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain.

[0274] One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element,

[0275] The communication control method includes:

[0276] The processor performs the following operations: based on the setting information, at least

[0277] transmitting a first preamble in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities,

[0278] transmitting a second preamble in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities,

[0279] The first RACH timing and the second RACH timing are timings different from each other in the frequency domain, the time domain, or the frequency domain and the time domain.

[0280] (8) A communication control method in which a processor executes transmission of setting information to a terminal device via a wireless transceiver, wherein:

[0281] The setting information includes:

[0282] One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and

[0283] The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain.

[0284] One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element,

[0285] The communication control method includes:

[0286] The processor performs the following operations:

[0287] From the terminal device, based on the setting information, at least

[0288] receiving a first preamble transmitted in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities,

[0289] receiving a second preamble transmitted in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities,

[0290] The first RACH timing and the second RACH timing are timings different from each other in the frequency domain, the time domain, or the frequency domain and the time domain.

[0291] (9) A communication control program causing a processor to execute a process of receiving setting information from a base station via a wireless transceiver, wherein:

[0292] The setting information includes:

[0293] One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and

[0294] The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain.

[0295] One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element,

[0296] The communication control program includes:

[0297] The processor is caused to perform the following operations: based on the setting information, at least

[0298] transmitting a first preamble in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities,

[0299] transmitting a second preamble in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities,

[0300] The first RACH timing and the second RACH timing are timings different from each other in the frequency domain, the time domain, or the frequency domain and the time domain.

[0301] (10) A communication control program that causes a processor to execute the process of transmitting setting information to a terminal device via a wireless transceiver, wherein:

[0302] The setting information includes:

[0303] One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and

[0304] The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain.

[0305] One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element,

[0306] The communication control program includes:

[0307] The processor is caused to perform the following operations:

[0308] From the terminal device, based on the setting information, at least

[0309] receiving a first preamble transmitted in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities,

[0310] receiving a second preamble transmitted in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities,

[0311] The first RACH timing and the second RACH timing are timings different from each other in the frequency domain, the time domain, or the frequency domain and the time domain.

Claims

1. A terminal device comprising: wireless transceiver; and circuit, receives setting information from a base station via the wireless transceiver, in, The setting information includes: One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain. One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element, The circuit is configured to: based on the setting information, at least transmitting a first preamble in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities, transmitting a second preamble in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities, The first RACH timing and the second RACH timing are different timings in the frequency domain, the time domain, or the frequency domain and the time domain. The three situations are represented by the following symbols: an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities completely overlap with each other; an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities partially overlap with each other; and A flag indicating that the first plurality of RACH opportunities do not overlap with the second plurality of RACH opportunities.

2. The terminal device according to claim 1, wherein When a flag indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities completely overlap with each other or a flag indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities do not overlap with each other is set, In a case where the base station does not detect reception of a preamble in the first RACH opportunity among the first plurality of RACH opportunities and the second plurality of RACH opportunities, when the base station receives a broadcast signal indicating that grant or grant-free transmission can be performed, transmitted from the base station before the start of the second or subsequent RACH opportunities, the base station diverts resources of the second or subsequent RACH opportunities to uplink data transmission.

3. The terminal device according to claim 2, wherein: The broadcast signal is an assignment signal given to the downlink. The resources of the second and subsequent RACH opportunities are used for downlink data transmission.

4. The terminal device according to any one of claims 1 to 3, wherein: The circuit transmits the same preamble in the first preamble and the second preamble.

5. A base station comprising: wireless transceiver; and circuit, sending setting information to the terminal device via the wireless transceiver, in, The setting information includes: One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain. One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element, From the terminal device, based on the setting information, at least receiving a first preamble transmitted in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities, receiving a second preamble transmitted in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities, The first RACH timing and the second RACH timing are different timings in the frequency domain, the time domain, or the frequency domain and the time domain. The three situations are represented by the following symbols: an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities completely overlap with each other; an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities partially overlap with each other; and A flag indicating that the first plurality of RACH opportunities do not overlap with the second plurality of RACH opportunities.

6. A communication control method, wherein a processor executes receiving setting information from a base station via a wireless transceiver, in the communication control method, The setting information includes: One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain. One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element, The communication control method includes: The processor performs the following operations: based on the setting information, at least transmitting a first preamble in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities, transmitting a second preamble in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities, The first RACH timing and the second RACH timing are different timings in the frequency domain, the time domain, or the frequency domain and the time domain. The three situations are represented by the following symbols: an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities completely overlap with each other; an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities partially overlap with each other; and A flag indicating that the first plurality of RACH opportunities do not overlap with the second plurality of RACH opportunities.

7. A communication control method, wherein a processor executes sending setting information to a terminal device via a wireless transceiver, in the communication control method, The setting information includes: One or more first information elements indicating mapping of a plurality of beamforming synchronization signal blocks (SSBs) to a first plurality of random access channel (RACH) opportunities and a second plurality of RACH opportunities, respectively; and The second information element relates to a situation in which the first plurality of RACH opportunities overlap with the second plurality of RACH opportunities in the frequency domain, the time domain, or the frequency domain and the time domain. One of three situations involving overlap between the first plurality of RACH opportunities and the second plurality of RACH opportunities is set as the second information element, The communication control method includes: The processor performs the following operations: From the terminal device, based on the setting information, at least receiving a first preamble transmitted in a first RACH opportunity associated with a first SSB among the plurality of SSBs among the first plurality of RACH opportunities, receiving a second preamble transmitted in a second RACH opportunity associated with a second SSB among the plurality of SSBs among the second plurality of RACH opportunities, The first RACH timing and the second RACH timing are different timings in the frequency domain, the time domain, or the frequency domain and the time domain. The three situations are represented by the following symbols: an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities completely overlap with each other; an indicator indicating that the first plurality of RACH opportunities and the second plurality of RACH opportunities partially overlap with each other; and A flag indicating that the first plurality of RACH opportunities do not overlap with the second plurality of RACH opportunities.

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