Base station device, terminal device, and wireless communication system

Abstract

Provided is a base station device having a carrier that supports spectrum sharing (SS) in an N-th generation (where N is an integer) and an M-th generation (where M is an integer) different from the N-th generation, the base station device comprising: a transmission unit that transmits an initial signal used by a terminal device in initial access; and a control unit that shares at least part of the initial signal between terminal devices of the N-th generation and the M-th generation.

Description

Base Station Device, Terminal Device, and Wireless Communication System

[0001] The present invention relates to a base station device, a terminal device, and a wireless communication system.

[0002] In the transition of wireless communication generations, a technology called DSS (Dynamic Spectrum Sharing) has attracted attention. DSS is a technology that shares a part of the frequencies used in, for example, a fifth-generation (5G) wireless communication system with a sixth-generation (6G) wireless communication system. A base station device corresponding to DSS realizes DSS by transmitting, for example, a 5G signal and a 6G signal. In DSS, the sharing ratio of signals of each generation is variable and is determined, for example, by wireless quality, the usage status of wireless resources, etc. By performing DSS, it becomes possible to expand the next-generation communication area (in the above case, the 6G communication area) at an early stage.

[0003] Technologies related to DSS are described in Patent Document 1 and Patent Document 2 below.

[0004] Special Table 2024-512653 Special Table 2024-502019

[0005] TS38.331 V18.3.0

[0006] However, in a base station device corresponding to DSS, for example, the format of messages in initial access is not determined. For example, in a 6G cell, there is a cell called a NES (Network Energy Saving) cell that temporarily stops operating. The base station device may perform partial or temporary outage for 6G considering NES, but cannot perform outage for 5G. Therefore, a base station device corresponding to DSS may not be able to suppress the use of wireless resources for 5G terminal devices even when in an outage state in 6G, and the effect of NES may not be fully obtained.

[0007] Therefore, one disclosure provides a base station device, a terminal device, and a wireless communication system that can efficiently use wireless resources in DSS.

[0008] A base station device having a carrier corresponding to SS (Spectrum Sharing) in the Nth generation (where N is an integer) and a different Mth generation (where M is an integer), comprising: a transmitting unit that transmits an initial signal used by terminal devices in initial access; and a control unit that shares at least a portion of the initial signal among the Nth and Mth generation terminal devices.

[0009] One disclosure indicates that wireless resources can be used efficiently in DSS.

[0010] Figure 1 shows an example configuration of the wireless communication system 10. Figure 2 shows an example configuration of the base station device 200. Figure 3 shows an example configuration of the terminal device 101. Figure 4 shows examples of SSB and SIB in 5G and 6G. Figure 5 shows an example of a 6G resource block. Figure 6 shows an example of 6G scheduling information. Figure 7 shows examples of SSB and SIB in 5G and 6G. Figure 8 shows examples of SSB and SIB in 5G and 6G. Figure 9 shows examples of SSB and SIB in 5G and 6G.

[0011] Figure 1 shows an example configuration of a wireless communication system 10. The wireless communication system 10 includes a base station device 200, a terminal device 100, and a terminal device 101. The wireless communication system 10 is a wireless communication system that corresponds to DSS. DSS corresponds to the Nth generation (where N is an integer of 1 or more) (e.g., the current generation) and the Mth generation (where M is an integer of 1 or more, a different number from N) (e.g., the next generation). The Nth generation is, for example, 5G, and the Mth generation is, for example, 6G. Hereafter, 5G and 6G will be explained as examples, but the corresponding generations are not limited to these. Also, the Nth generation and the Mth generation can be replaced with, for example, the first RAT and the second RAT.

[0012] Furthermore, the wireless communication system 10 may also support Spectrum Sharing (SS), which does not dynamically change the ratio of signals for each generation. Hereafter, DSS can be read as SS.

[0013] The terminal device 100 is a communication device that supports 5G (capable of supporting 5G functions), such as a smartphone or tablet terminal. The terminal device 100 connects wirelessly to the base station device 200 and performs wireless communication.

[0014] The terminal device 101 is a communication device that supports 6G (capable of supporting 6G functions), such as a smartphone or tablet terminal. The terminal device 101 wirelessly connects to the base station device 200 and performs wireless communication.

[0015] The base station device 200 is a device that wirelessly connects with terminal devices 100 and 101 to perform wireless communication, and is, for example, an eNodeB or gNodeB (gNB). The base station device 200 supports an NES function that transitions to a sleep state in response to instructions from a control device or other base station devices 200. The sleep state is a state in which some functions are stopped, for example, a state in which some messages transmitted by the base station device 200 are not transmitted and / or received.

[0016] To support DSS, the base station device 200 shares some or all of the messages used by terminal devices 100 and 101 for initial access to communicate wirelessly with the base station device 200 across 5G and 6G networks. This sharing is achieved, for example, by not creating a separate message for 6G (which the 5G terminal device 100 cannot analyze), and instead allowing the 6G terminal device 101 to use the same messages used for 5G.

[0017] Furthermore, the base station device 200 constitutes cell A200 and wirelessly connects with terminal devices 100 and 101 that are camped on to cell A200 to perform wireless communication. Camping on to a cell includes, for example, terminal devices 100 and 101 performing cell selection (e.g., cell selection) and reselection (e.g., cell reselection) and entering a state in which they monitor broadcast information and paging information from the cell.

[0018] Furthermore, the base station equipment 200 supports DSS and transmits 5G and 6G signals.

[0019] <Example Configuration of Base Station Device 200> Figure 2 shows an example configuration of base station device 200. The base station device 200 includes a CPU (Central Processing Unit) 210, storage 220, memory 230, and wireless communication circuit 250.

[0020] Storage 220 is an auxiliary storage device such as flash memory, HDD (Hard Disk Drive), or SSD (Solid State Drive) that stores programs and data. Storage 220 stores the wireless communication control program 221 and the DSS control program 222.

[0021] Memory 230 is an area for loading programs stored in storage 220. Memory 230 may also be used as an area for programs to store data.

[0022] The wireless communication circuit 250 is a device that communicates wirelessly with terminal devices 100 and 101. The base station device 200 transmits and receives signals (messages) with terminal devices 100 and 101 via the wireless communication circuit 250.

[0023] The CPU 210 is a processor that loads programs stored in the storage 220 into the memory 230, executes the loaded programs, builds each part, and performs each process.

[0024] The CPU 210 constructs the control unit and the transmission unit by executing the wireless communication control program 221 and performs wireless communication control processing. The wireless communication control processing is the process of controlling wireless communication with terminal devices 100 and 101. The wireless communication control processing includes, for example, processes such as transitioning to the S-sleep state and recovering from the sleep state in the NES function.

[0025] The CPU 210 constructs the control unit and transmission unit and performs DSS control processing by executing the DSS control program 222. DSS control processing is the process of transmitting 5G and 6G signals in order to communicate with 5G and 6G terminal devices. The base station device 200 enables wireless communication with terminal devices 100 and 101 by performing DSS control processing.

[0026] <Example of Terminal Device 101 Configuration> Figure 3 is a diagram showing an example of the configuration of terminal device 101. Terminal device 101 has a CPU 110, storage 120, memory 130, and wireless communication circuit 150.

[0027] Storage 120 is an auxiliary storage device such as flash memory, HDD, or SSD that stores programs and data. Storage 120 stores the wireless communication program 121 and the camp-on program 122.

[0028] Memory 130 is an area for loading programs stored in storage 120. Memory 130 may also be used as an area for programs to store data.

[0029] The wireless communication circuit 150 is a device that communicates wirelessly with the base station device 200. The terminal device 101 transmits and receives signals (messages) with the base station device 200 via the wireless communication circuit 150.

[0030] The CPU 110 is a processor that loads programs stored in the storage 120 into the memory 130, executes the loaded programs, constructs each part, and performs each process.

[0031] The CPU 110 constructs the receiving unit and terminal transmitting unit and performs wireless communication processing by executing the wireless communication program 121. Wireless communication processing is the process of wirelessly connecting with the base station device 200 and performing communication.

[0032] The CPU 110 constructs the receiving unit and the terminal transmitting unit and performs idle mode processing by executing the idle mode module 1211 of the wireless communication program 121. Idle mode processing is the process of searching for adjacent cells and camping on to an appropriate cell in idle mode. Idle mode processing also includes the process of executing the paging function (receiving operation of paging).

[0033] The CPU 110 constructs the receiving unit and the terminal transmitting unit and performs DL synchronization processing by executing the DL synchronization module 1212 of the wireless communication program 121. DL synchronization processing is the process of synchronizing with the carrier performing DSS (hereinafter sometimes referred to as carrier #1). DL synchronization processing includes the process of acquiring system information.

[0034] [First Embodiment] The first embodiment will now be described. In the first embodiment, carrier #1 shares synchronization signal blocks (SSBs) consisting of PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), and MIB (Master Information Block) for 5G and 6G.

[0035] Figure 4 shows examples of SSB and SIB in 5G and 6G. In the first embodiment, the 6G-compatible terminal device 101 uses the 5G PSS, SSS, and MIB. In the following drawings, signals indicated as "_6G" indicate 6G-compatible signals, and the 5G terminal device 100 cannot analyze (cannot use) them.

[0036] The following describes the operation in idle mode and DL synchronization. We will explain the operation of the 5G terminal device 100 and the 6G terminal device 101 separately.

[0037] <1.1 Operation in Idle Mode> <1.1.1 In the case of terminal device 100> The terminal device 100 receives the 5G PSS and SSS (M1), MIB (M2), and SIB (System Information Block) x (x is a natural number) (M3, M4), and if the cell is appropriate, it camps on to the cell.

[0038] The terminal device 100 follows the 5G settings for paging reception operations.

[0039] The display (e.g., LCD screen) of the terminal device 100 displays, for example, "5G" to indicate that communication is taking place on a 5G network.

[0040] <1.1.2 Case of Terminal Device 101> The terminal device 101 receives 5G PSS and SSS (M1), MIB (M2), and SIBx (M3, M4). If the cell is appropriate, the terminal device camps on the cell.

[0041] For the paging reception operation, the terminal device 101 follows the 5G settings. Alternatively, for the paging reception operation, the terminal device 101 follows the 6G settings (when different settings from 5G are provided in 6G).

[0042] On the display (e.g., liquid crystal screen) of the terminal device 101, for example, "6G" indicating that it is communicating in a 6G network is displayed. Note that if the MIB or SIBx contains information indicating correspondence to 6G or performing DSS in both 5G and 6G, the terminal device 101 can read the information and recognize that it is 6G.

[0043] <1.2 Operations in DL Synchronization> <1.2.1 Case of Terminal Device 100> The terminal device 100 receives 5G PSS and SSS (M1), MIB (M2), and synchronizes with carrier #1. Then, the terminal device 100 receives the MIB, obtains 5G SIB1 included in the MIB, and receives 5G SIB1 (M3) and subsequent SIBx (M4). Although the MIB contains scheduling information (6G scheduling information) of 6G SIB1 (SIB1_6G), the terminal device 100 ignores (or cannot analyze) the 6G scheduling information.

[0044] <1.2.2 Case of Terminal Device 101> The terminal device 101 receives 5G PSS and SSS (M1), MIB (M2), and synchronizes with carrier #1. Then, the terminal device 101 obtains the 6G scheduling information included in the MIB, and receives SIB1_6G1 (M11) and subsequent SIBx_6G (M12).

[0045] The 6G scheduling information is, for example, 1-bit information and is information for notifying that SIB1_6G is being transmitted. Regarding the transmission timing, frequency, etc. of SIB1_6G, they are, for example, pre-determined values or detected by blind decoding.

[0046] Also, the 6G scheduling information is, for example, information of 2 bits or more and may include information regarding the transmission timing and frequency of SIB1_6G.

[0047] Note that the terminal device 101 uses the 6G RACH (Random Access Channel). The base station device 200 can recognize that the terminal device 101 supports 6G when the terminal device 101 makes a wireless connection using the 6G RACH.

[0048] <1.3 Resource Block> When the 6G scheduling information is notified in the MIB, the information necessary for the terminal device 101 to receive SIB1_6G is transmitted in a predetermined resource block.

[0049] The transmission position of the predetermined resource block is set, for example, as a relative position (time) based on the resource block of the 5G SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) Block (relative position).

[0050] FIG. 5 is a diagram showing an example of a 6G resource block. Resource P1 is an example of using the same OFDM Symbol as 5G. Resource P2 is an example of using an OFDM Symbol consecutive to the 5G OFDM Symbol. Resource P3 is an example of using an OFDM Symbol that is different from the OFDM Symbol by n (n is a natural number) Symbols.

[0051] <1.4 Others> For example, if 6G system information is provided via 6G SSB (including MIB), the Physical Cell ID (Identifier) ​​and Subcarrier Spacing (SCS) cannot be notified to the terminal device 101 via 5G MIB. Therefore, notification can be made by, for example, notifying as SIBx_6G or by applying the same value provided via 5G SSB to 6G.

[0052] When carrier #1 is registered as a neighbor cell in a neighboring cell, the neighbor cell information is handled as follows, for example:

[0053] - Include information in the neighbor cell list stating that "Carrier #1 is 6G, but 6B SSB is not being transmitted, and measurements will be performed using 5G SSB." - Register in the neighbor cell list stating that "Carrier #1 is 5G." - Manage the 5G Neighbor Cell Relationship (NCR) and 6G NDR independently, and for registration of DSS-enabled 6G cells, add information in the 6G NCR indicating that 5G SSB is being used. When performing serving cell measurements with RRM Measurement, set the following base station equipment as the measurement target.

[0054] - Measuring the SSB of 5G operating in DSS - Measuring the CSI-RS set as 6G Figure 6 shows an example of 6G scheduling information. For example, the spare (1-bit information) of the MIB in 5G, as described in Section 6.2.2 of Non-Patent Document 1, is used as 6G scheduling information.

[0055] [Second Embodiment] A second embodiment will now be described. In the second embodiment, carrier #1 uses the same PSS and SSS for 5G and 6G.

[0056] Figure 7 shows examples of SSB and SIB in 5G and 6G. In the second embodiment, the terminal device 101 corresponding to 6G uses 5G PSS and SSS.

[0057] The following describes the operation in idle mode and DL synchronization. We will explain the operation of the 5G terminal device 100 and the 6G terminal device 101 separately.

[0058] <2.1. Operation in Idle Mode> <2.1.1 In the case of terminal device 100> The operation is the same as in the first embodiment.

[0059] <2.1.2 In the case of terminal device 101> Terminal device 101 receives the 5G PSS and SSS (M1). Then, it obtains information about MIB_6G contained in the PSS and SSS and receives MIB_6G (M21). Furthermore, terminal device 101 obtains information about SIB1_6G (M22) contained in MIB_6G and receives SIB1_6G. Then, terminal device 101 receives the subsequent SIBx_6G (M23). If the cell is appropriate, terminal device 101 camps on to the cell.

[0060] For terminal device 101, the paging reception operation follows, for example, the 6G settings.

[0061] The display (e.g., LCD screen) of the terminal device 101 will show, for example, "6G" to indicate that communication is taking place on a 6G network. The terminal device 101 is also capable of recognizing that it is on a 6G network when it receives MIB_6G or SIBx_6G.

[0062] <2.2 Operation in DL synchronization> <2.2.1 In the case of terminal device 100> The operation is the same as in the first embodiment.

[0063] <2.2.2 In the case of terminal device 101> Terminal device 101 receives the 5G PSS and SSS (M1) and synchronizes with carrier #1. Then, terminal device 101 receives the 6G MIB_6G (M21). Subsequently, terminal device 101 receives the 6G SIBx_6G (M22, M23).

[0064] The terminal device 101 utilizes 6G RACH. The base station device 200 can recognize that the terminal device 101 is 6G compatible when it establishes a wireless connection using 6G RACH.

[0065] <2.3 Resource Blocks> This section describes the transmission location (resource block) of the physical channel (6G PBCH) that transmits MIB_6G. The resource block is determined, for example, based on the resource block of the 5G SS / PBCH Block (relative location).

[0066] Figure 5 shows an example of a 6G resource block. Resource P1 is an example that uses the same OFDM symbol as 5G. Resource P2 is an example that uses OFDM symbols that are consecutive to the OFDM symbol of 5G. Resource P3 is an example that uses OFDM symbols that differ by n symbols from the OFDM symbol. The resource block may be determined in advance by one of resources P1 to P3, or the base station device 200 may determine from resources P1 to P3. If the base station device 200 makes the determination, the terminal device 101 detects it by blind decoding.

[0067] <2.4 Others> The same as in the first embodiment.

[0068] [Third Embodiment] A third embodiment will now be described. In the third embodiment, carrier #1 standardizes PSS, SSS, MIB, and SIB1 for 5G and 6G.

[0069] Figure 8 shows examples of SSB and SIB in 5G and 6G. In the third embodiment, the terminal device 101 corresponding to 6G uses the PSS, SSS, MIB, and SIB1 of 5G.

[0070] The following describes the operation in idle mode and DL synchronization. We will explain the operation of the 5G terminal device 100 and the 6G terminal device 101 separately.

[0071] <3.1. Operation in Idle Mode> <3.1.1 In the case of terminal device 100> The operation is the same as in the first embodiment.

[0072] <3.1.2 In the case of terminal device 101> Terminal device 101 receives the 5G PSS, SSS (M1), MIB (M2), and SIB1 (M3). Then, if the cell is suitable, terminal device 101 camps on to the cell.

[0073] For terminal device 101, the paging reception operation follows, for example, the 5G settings.

[0074] The display (e.g., LCD screen) of the terminal device 101 will show, for example, "6G" to indicate that communication is taking place on a 6G network. The terminal device 101 will be able to recognize that it is a 6G network because the SIB1 contains 6G scheduling information.

[0075] <3.2 Operation in DL synchronization> <3.2.1 In the case of terminal device 100> The operation is the same as in the first embodiment.

[0076] <3.2.2 In the case of terminal device 101> Terminal device 101 receives the 5G PSS and SSS (M1), MIB (M2), and SIB1 (M3), and synchronizes with carrier #1. Then, terminal device 101 acquires the 6G scheduling information contained in SIB1 and receives the subsequent SIBx_6G (M31).

[0077] The terminal device 101 utilizes 5G RACH. The terminal device 101 uses 6G RO (Rach Occasion) to send a Random access preamble (message 1). Then, the terminal device 101 sends a Schedule transmission (message 3) to the base station device 200, including UE Capability indicating 6G support. Furthermore, the terminal device 101 sends an RRC connection setup complete (message 5) to the base station device 200, including UE Capability indicating 6G support.

[0078] Furthermore, terminal device 101 may use 6G RACH. In this case, base station device 200 will notify terminal device 101 of the RACH config that will be provided by the 6G SIB1 in a separate message.

[0079] <3.3 Resource Block> This shall be the same as in the first embodiment.

[0080] <3.4 Others> The same as in the first embodiment.

[0081] [Fourth Embodiment] A fourth embodiment will now be described. In the fourth embodiment, carrier #1 standardizes PSS, SSS, MIB, and SIBx for 5G and 6G.

[0082] Figure 9 shows examples of SSB and SIB in 5G and 6G. In the fourth embodiment, the terminal device 101 corresponding to 6G uses 5G PSS, SSS, MIB, and SIBx.

[0083] The following describes the operation in idle mode and DL synchronization. We will explain the operation of the 5G terminal device 100 and the 6G terminal device 101 separately.

[0084] <4.1. Operation in Idle Mode> <4.1.1 In the case of terminal device 100> The operation is the same as in the first embodiment.

[0085] <4.1.2 In the case of terminal device 101> Terminal device 101 receives 5G PSS, SSS (M1), MIB (M2), and SIBx (M3, M4). Then, if the cell is suitable, terminal device 101 camps on to the cell.

[0086] For terminal device 101, the paging reception operation follows, for example, the 5G settings.

[0087] The display (e.g., LCD screen) of the terminal device 101 will show, for example, "6G" to indicate that communication is taking place on a 6G network. The terminal device 101 is capable of recognizing that it is a 6G network because its MIB and SIB1 support DSS and contain 6G scheduling information.

[0088] <4.2 Operation in DL synchronization> <4.2.1 In the case of terminal device 100> The operation is the same as in the first embodiment.

[0089] <4.2.2 In the case of terminal device 101> Terminal device 101 receives 5G PSS and SSS (M1), MIB (M2), SIB1 (M3), and SIBx (M4), and synchronizes with carrier #1.

[0090] For example, when establishing an RRC connection, the terminal device 101 provides 6G system information (SI) via Dedicated Signaling.

[0091] Terminal device 101 utilizes 5G RACH. Terminal device 101 uses 6G RO (Rach Occasion) to send a Random access preamble (message 1). Then, terminal device 101 sends a Schedule transmission (message 3) to base station device 200, including UE Capability indicating 6G compatibility. Furthermore, terminal device 101 sends an RRC connection setup complete (message 5) to base station device 200, including UE Capability indicating 6G compatibility. Note that 6G RACH is not available, or terminal device 101 cannot be used.

[0092] [Other Embodiments] For example, the resource block in the fourth embodiment utilizes a 5G resource block. However, different resource blocks may be used, for example, as in the first and second embodiments.

[0093] Furthermore, the resource blocks described above are just examples, and it is not necessary to use 5G resource blocks as a reference.

[0094] Furthermore, carrier #1 may standardize PSS, SSS, MIB, and SIB1 through SIBy (where y is an integer greater than or equal to 2) for both 5G and 6G.

[0095] 10: Wireless communication system 100: Terminal device 101: Terminal device 110: CPU 120: Storage 121: Wireless communication program 1211: Idle mode module 1212: DL synchronization module 122: Camp-on program 130: Memory 150: Wireless communication circuit 200: Base station device 210: CPU 220: Storage 221: Wireless communication control program 222: DSS control program 230: Memory 250: Wireless communication circuit

Claims

1. A base station device having a carrier corresponding to SS (Spectrum Sharing) in the Nth generation (where N is an integer) and a different Mth generation (where M is an integer), the base station device comprising: a transmitting unit that transmits an initial signal used by a terminal device in initial access; and a control unit that shares at least a portion of the initial signal among the Nth and Mth generation terminal devices.

2. The base station device according to claim 1, wherein the control unit shares the PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), and MIB (Master Information Block).

3. The base station device according to claim 1, wherein the control unit shares PSS and SSS.

4. The base station device according to claim 1, wherein the control unit shares the PSS, SSS, MIB, and SIB (System Information Block) 1.

5. The base station device according to claim 1, wherein the control unit shares PSS, SSS, MIB, and SIBx (where x is a natural number).

6. The base station device according to claim 1, wherein the MIB includes correspondence information indicating that it corresponds to the M generation in the SS.

7. When the correspondence information is included in the MIB, the resource block containing information for a terminal device corresponding to the M generation to receive the SIB1 corresponding to the M generation is set to a relative position with respect to the resource block containing information for receiving the SIB1 corresponding to the N generation, according to claim 6.

8. A terminal device for the M generation in a wireless communication system having a carrier that supports Spectrum Sharing (SS) in the Nth generation (where N is an integer) and an M generation (where M is an integer) different from the Nth generation, comprising: a receiving unit that receives, in initial access, an initial signal used for the initial access transmitted by a base station device, which includes an initial signal shared between the Nth and M generations and an initial signal provided for the M generation; and a terminal transmitting unit that transmits information to the base station device indicating that the device supports the M generation.

9. A wireless communication system having a carrier corresponding to SS (Spectrum Sharing) in an Nth (N is an integer) generation and an M (M is an integer) generation different from the Nth generation, comprising: a first terminal device corresponding to the Nth generation; a second terminal device corresponding to the M generation; and a base station device, wherein the base station device comprises: a transmitting unit that transmits an initial signal used by the first and second terminal devices in initial access; and a control unit that shares at least a portion of the initial signal among the Nth and M generation terminal devices.

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