Master station device, slave station device and communication control method

Abstract

The present invention provides a master station device, a substation device and a communication control method. The master station device connected to the substation device through fronthaul comprises: a first base station signal processing unit having a first functional division structure related to a plurality of base station functional units for a first service type; and a second base station signal processing unit having a second functional division structure related to the plurality of base station functional units for a second service type.

Description

Technical Field

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

[0002] In a wireless communication system, in order to flexibly construct an area that can wirelessly communicate with user equipment (UE), a structure can be adopted in which a wireless base station is divided into a main station device and a slave station device and the slave station device is configured at a position different from the main station device.

[0003] For example, a master station device connected to a core network has a baseband signal processing function of a wireless base station, and one or more slave stations are connected to the master station device. The slave station device performs wireless processing such as analog conversion and wirelessly communicates with the UE. Summary of the invention

[0004] Non-limiting embodiments of the present disclosure provide a master station device, a slave station device, and a communication control method that can efficiently reduce the communication traffic between the master station device and the slave station device.

[0005] A main station device involved in one embodiment of the present invention is connected to a substation device via a fronthaul, and comprises: a first base station signal processing unit, which has a first functional division structure related to multiple base station functional units for a first service type; and a second base station signal processing unit, which has a second functional division structure related to multiple base station functional units for a second service type.

[0006] One embodiment of the present invention involves a substation device connected to a main station device via a fronthaul, and comprises: a first base station signal processing unit, which has a first functional division structure associated with a plurality of base station functional units for a first service type; and a second base station signal processing unit, which has a second functional division structure associated with a plurality of said base station functional units for a second service type.

[0007] A communication control method according to one embodiment of the present invention comprises: obtaining, by a main station device connected to a substation device via a fronthaul, information indicating the transmission quality of the fronthaul; and determining, based on the information indicating the transmission quality of the fronthaul, the transmission mode of the fronthaul in a first base station signal processing unit and a second base station signal processing unit, respectively, wherein the first base station signal processing unit has a first functional division structure associated with a plurality of base station functional units for a first service type, and the second base station signal processing unit has a second functional division structure associated with the plurality of base station functional units for a second service type.

[0008] One embodiment of the present invention involves a communication control method in which a substation device connected to a main station device via a fronthaul sends a signal for the main station device to measure the transmission quality of the fronthaul; and based on information indicating the transmission quality of the fronthaul, the transmission mode of the fronthaul is determined for a first base station signal processing unit and a second base station signal processing unit, respectively, wherein the first base station signal processing unit has a first functional division structure related to multiple base station functional units for a first service type, and the second base station signal processing unit has a second functional division structure related to multiple base station functional units for a second service type.

[0009] In addition, these general or specific methods may also be implemented through systems, devices, methods, integrated circuits, computer programs or recording media, or may be implemented through a combination of systems, devices, methods, integrated circuits, computer programs and recording media.

[0010] According to one embodiment of the present disclosure, the communication traffic between a master station device and a slave station device can be effectively reduced.

[0011] Further advantages and effects of one embodiment of the present disclosure will be made clear by the description and drawings. These advantages and / or effects are provided by several embodiments and the features described in the description and drawings, but in order to obtain one or more of the same features, it is not necessary to provide all the features. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a diagram showing an example of the configuration of a wireless communication system according to Embodiment 1.

[0013] Figure 2 This is a block diagram showing an example of the configuration of a master station processing device according to the first embodiment.

[0014] Figure 3 This is a block diagram showing an example of the structure of a fronthaul (FH) transmitter according to the first embodiment.

[0015] Figure 4 This is a block diagram showing an example of the configuration of the FH receiver according to the first embodiment.

[0016] Figure 5 This is a block diagram showing an example of the structure of the slave station processing device involved in Embodiment 1.

[0017] Figure 6 This is a sequence diagram showing an example of the operation of the wireless communication system involved in Implementation Example 1.

[0018] Figure 7 This is a block diagram showing an example of the configuration of a master station processing device included in the master station device according to the second embodiment.

[0019] Figure 8 This is a block diagram showing an example of the configuration of an FH transmitter included in the master station device according to the second embodiment.

[0020] Fig. 9 This is a sequence diagram showing an example of the operation of the wireless communication system involved in Implementation Example 2.

[0021] Fig.10 This is a block diagram showing an example of the configuration of an FH receiver included in a slave station device according to the third embodiment.

[0022] Fig.11 This is a sequence diagram showing an example of the operation of the wireless communication system involved in Implementation Example 3.

[0023] Fig.12 This is a diagram showing an example of the structure of a wireless communication system involved in Implementation Example 4.

[0024] Fig.13 This is a block diagram showing an example of the configuration of a slave station processing device included in a slave station device according to the fourth embodiment.

[0025] Fig.14 This is a block diagram showing an example of the configuration of an FH transmitter included in a slave station device according to the fourth embodiment.

[0026] Fig.15 This is a block diagram showing an example of the configuration of an FH receiver included in the master station device according to the fourth embodiment.

[0027] Fig.16 This is a block diagram showing an example of the configuration of a master station processing device included in the master station device according to the fourth embodiment.

[0028] Description of symbols

[0029] 1 wireless base station; 2 UE; 11 main station device; 12 substation device; 13 FH; 20, 90 main station processing device; 202-1, 202-2, 902-1, 902-2 main station signal processing unit; 204, 904FH quality calculation unit; 30, 70FH transmitter; 306, 806 measurement unit; 40, 80FH receiver; 406, 706 training data unit; 407, 707 sending unit; 50, 60 substation processing device; 502-1, 502-2, 603-1, 603-2 substation signal processing unit. DETAILED DESCRIPTION

[0030] Before explaining the embodiment, the problems in the prior art will be briefly explained. In a conventional wireless communication system (for example, a wireless base station), there is still room for discussion on reducing the communication traffic between a master station device and a slave station device.

[0031] (Insights on the Implementation of the Present Disclosure)

[0032] In the prior art (for example, Japanese Patent Gazette No. 2018-170805), the main station device is sometimes referred to as a BBU (baseband unit) and the substation device is sometimes referred to as an RRH (remote radio head). For the connection between the main station device and the substation device, a wired transmission unit (or a wired interface) such as a coaxial cable, UTP (unshielded twisted pair) cable, STP (shielded twisted pair) cable, or optical fiber cable is used. Such a connection between the main station device and the substation device is sometimes referred to as a "front haul connection" or simply "front haul".

[0033] In regulations related to fronthaul (FH) communication methods (such as Common Public Radio Interface (CPRI) Interface Specification V7.0 (2015-10-09)), a master station device is called a REC (radio equipment controller) and a slave station device is called a RE (radio equipment).

[0034] Here, as wireless communication becomes faster and more capacitive, the amount of communication (for example, data traffic) of FH also increases. At this time, the communication band of FH may be insufficient.

[0035] As an example of a countermeasure to the insufficient bandwidth of FH, the following technology has been studied: by changing the previous structure to a structure in which multiple base station functions are divided (separated) into a main station device and a substation device, the traffic volume of FH is reduced (for example, Japanese Patent Publication No. 2018-170805). In addition, the boundary where multiple base station functions are divided into a main station device and a substation device is sometimes called a "functional split point".

[0036] For example, the following functional division structure is being studied, in which the substation device has an up conversion function and an amplification function, and the master station device has an up conversion function and an amplification function, instead of a functional division structure of the base station function. In addition, the "functional division structure" may also be referred to as a "functional division architecture".

[0037] Substation device

[0038] buffer

[0039] PDCP (packet data convergence protocol)

[0040] RLC (radio link control, wireless link layer control protocol)

[0041] MAC (medium access control)

[0042] coding

[0043] modulation

[0044] Resource Mapping

[0045] IFFT (inverse fast Fourier transform)

[0046] Upconversion

[0047] Master station device

[0048] Bearer terminal function

[0049] Here, the amount of data increases as the data header or redundancy increases as the processing approaches the transmission. As described above, since the number of functions configured in the master station device is increased compared to the slave station device, the amount of communication from the master station device to the slave station device, that is, the amount of FH communication, can be reduced. In addition, in the Common Public RadioInterface: eCPRI Interface Specification V2.0 (2019-05-10), the technology of changing the functional division between the master station device and the slave station device is also being studied.

[0050] In addition, the technology of dividing the control data and user data and applying different functions of the master station device and the slave station device to each data is also being studied (for example, International Publication No. 2016 / 088820). For user data, which tends to have a larger amount of data than control data, the communication volume of FH can be reduced by configuring more functions for the master station device.

[0051] In addition, methods for changing user allocation or resource allocation of wireless communication in response to the unloaded situation of the FH band are also being studied (for example, Japanese Patent Publication No. 2016-111637). For example, by preparing several patterns related to user allocation or resource allocation of wireless communication and applying the pattern narrowed to the FH band, the shortcomings of the FH band can be avoided.

[0052] However, since applying a mode that shrinks to the FH band like this places restrictions on the FH band, the system performance will be reduced. In addition, when the functional division structure between the master station device and the slave station device is changed, the system performance will differ depending on the functional division structure. Therefore, it is sometimes difficult to say that the system performance has been optimized for the service type of the data to be transmitted.

[0053] For example, the MAC function determines and controls the transmission method in wireless transmission based on the channel quality information (e.g., channel quality indicator, CQI) fed back from the UE. The transmission method in wireless transmission may also include the determination of MCS (modulation and coding scheme), in other words, the determination of transmission parameters such as coding rate and modulation multi-value number. In addition, the MAC function performs retransmission control called HARQ (hybrid automatic repeat request) based on the confirmation response (Ack / Nack) information fed back from the UE.

[0054] When the master station device is configured with a MAC function that performs such control, for example, coordination actions can be performed between multiple different substation devices connected to the master station device. Therefore, the SINR (signal-to-interference plus noise power ratio) of the wireless communication interval can be improved. Communication based on such coordination actions is called CoMP (coordinated multiple-point) communication or antenna coordination, etc.

[0055] In contrast, when the substation device is equipped with a MAC function, for example, since HARQ retransmission control can be implemented without going through FH (for example, optical transmission interval), the RTT (round trip time) can be shortened by the round trip time of FH, thereby reducing latency.

[0056] The differences in system performance corresponding to the differences in such functional division structures have not been considered or studied so far. Therefore, when multiple different functional division structures are used in a wireless base station, the differences in performance or capabilities corresponding to the functional division structures in FH transmission have not been considered or studied.

[0057] For example, depending on the difference in the functional division structure between the master station device and the slave station device, the type of signal (e.g., data) flowing through the FH (in other words, the output of which base station function flows) may be different. If the type of data flowing through the FH is different, the preferred or optimal means of FH transmission may also be different, so that, for example, there may be extra redundancy in the data in the FH transmission.

[0058] (Overview of the present disclosure)

[0059] Based on the above findings, in the present disclosure, for example, the following techniques are described.

[0060] (1) The functional division structure of the base station device (master station device and slave station device) is made different according to the service type.

[0061] (2) Controlling the transmission method in the fronthaul transmission between the master station device and the slave station device (e.g., making them different) according to the functional division structure. Controlling the transmission method in the FH transmission may include, for example, determining or controlling at least one of error correction coding, coding rate, and modulation method.

[0062] (3) Notify the master station device of the transmission quality in FH transmission (for example, feedback).

[0063] (4) The master station device controls the wireless transmission method based on the information related to the wireless transmission quality, the service type and the FH transmission quality. The control of the wireless transmission method may include, for example, determining or controlling at least one of error correction coding, coding rate and modulation method.

[0064] (5) In FH transmission, signal redundancy is reduced by allowing a decrease in signal quality (in other words, for example, allowing data loss to occur in FH transmission). By reducing signal redundancy in FH transmission, the traffic volume of FH transmission can be reduced. In the control of the wireless transmission method in (4) above, by considering or adopting the signal distortion allowed for FH transmission, the transmission quality as a wireless communication system (hereinafter sometimes referred to as "system") can be guaranteed.

[0065] The following description will be made with reference to the accompanying drawings as appropriate. In addition, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from being unnecessarily lengthy and to make it easy for those skilled in the art to understand.

[0066] In addition, the drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims by these contents.

[0067] (Implementation Method 1)

[0068] Figure 1 FIG. 1 is a diagram showing an example of a structure of a wireless communication system according to Embodiment 1. Figure 1 As illustrated, the wireless communication system includes, for example, a wireless base station 1 and a UE 2 as an example of a terminal device. The number of the wireless base stations 1 and the number of the UE 2 may be two or more.

[0069] UE2 communicates with wireless base station 1 by wireless connection. The wireless communication between UE2 and wireless base station 1 includes at least one of uplink (UL) communication and downlink (DL) communication. In addition, the following describes an example of the structure and operation of DL of wireless base station 1. The example of UL will be described later in embodiments 4 to 6 ( Figure 12 to Figure 16 ) for explanation.

[0070] The wireless base station 1 includes, for example, a main station device 11 and a substation device 12 that are connected to each other via an FH 13. The main station device 11 may also be called, for example, a BBU, a CBBU (centralized baseband unit), an REC, or a CU (central unit). The substation device 12 may also be called, for example, an RRH, an RE, or a DU (distributed unit). In addition, one main station device may also be connected to two or more substation devices. In addition, one substation device may also be connected to two or more UEs.

[0071] In FH13, a wired transmission unit (or wired interface) such as a UTP cable, an STP cable, or an optical fiber cable may also be illustratively applied. The wired interface may also be an interface based on standards or technologies such as CPRI (common public radio interface), eCPRI (evolved CPRI), OBSAI (open base station architecture initiative), RoE (radio over Ethernet), and RoF (radio over fiber). In addition, "Ethernet" is a registered trademark.

[0072] <Master station device 11>

[0073] The master station device 11 illustratively includes a master station processing device 20 and an FH transmitter 30, and the slave station device 12 includes an FH receiver 40 and a slave station processing device 50. Figure 2 An example of the structure of the master station processing device 20 is shown. Figure 3 An example of the structure of the FH transmitter 30 is shown. Figure 4 An example of the structure of the FH receiver 40 is shown. Figure 5 An example of the configuration of the slave station processing device 50 is shown.

[0074] (Master Station Processing Device 20)

[0075] like Figure 2 As shown in the example, the master station processing device 20 includes a service class separator 201 , master station signal processing units 202 - 1 and 202 - 2 , a multiplexing unit 203 , and an FH quality calculation unit 204 .

[0076] In addition, the master station signal processing units 202-1 and 202-2 are sometimes marked as master station signal processing units 202#1 and 202#2, respectively. In addition, when the master station signal processing units 202-1 and 202-2 are not distinguished, they are sometimes marked as master station signal processing units 202. The number of master station signal processing units 202 included in the master station processing device 20 is not limited to 2, and may be 3 or more. For example, an integer greater than 2 may be set to N, and N master station signal processing units 202 are marked as master station signal processing units 202#j (j is j=1 to N). In addition, N may also be understood to correspond to the number of service types.

[0077] The service type separation unit 201 divides the signal (e.g., user data) sent from the upper core network (e.g., EPC or 5GC) according to each service type. "EPC" is the abbreviation of "evolved packet core", and 5GC is the abbreviation of "5th generation (5G) core network".

[0078] 5G stands for the fifth generation of radio access technology (RAT), sometimes also labeled as NR (new radio). In addition, 5GC is sometimes also labeled as NGC (next generation core network).

[0079] Figure 2 The configuration position of the service type separation unit 201 is not limited to Figure 2The service type separation unit 201 may be arranged at the position shown (in front of the SDAP unit 2021). For example, the service type separation unit 201 may be arranged at a subsequent stage of the SDAP unit 2021 or a subsequent stage of the PDCP unit 2022 described later.

[0080] As a non-limiting example of service types, high-speed and large-capacity eMBB (enhanced mobile broadband), ultra-reliable and low latency communications (URLLC), and massive machine type communications (mMTC) listed in the requirements of 5G can be cited. User data can be segmented (or classified) according to these service types.

[0081] Additionally or alternatively, user data may also be classified according to QoS (quality of service) parameters specified for each data flow. QoS parameters may include, for example, ARP (allocation and retention priority), GBR (guaranteed bit rate), MBR (maximum bit rate), and 5G QoS Identifier (5G QoS Identifier).

[0082] Additionally or alternatively, user data may also be categorized by application of different services.

[0083] like Figure 2 As shown, the master station signal processing unit 202#1 corresponding to the service type #1 includes, for example, a SDAP (service data adaptation protocol) unit 2021, a PDCP (packet data convergence protocol) unit 2022, an RLC (radio link control) unit 2023, and a MAC unit 2024. In addition, the master station signal processing unit 202#1 includes, for example, an encoding unit 2025, a scrambling unit 2026, a modulation unit 2027, a layer mapping unit 2028, a precoding unit 2029, and an RE (resource element) mapping unit 2030.

[0084] These functional units 2021 to 2030 are connected with Figure 5 The functional units 5029 and 5030 in the slave station signal processing unit 502#1 described later are provided together as a non-limiting example of a plurality of base station functional units in the wireless base station 1. In addition, the coding unit 2025, the scrambling unit 2026, the modulation unit 2027, the layer mapping unit 2028, the precoding unit 2029, and the RE mapping unit 2030 constitute the upper physical layer (High-PHY) block 2001.

[0085] The SDAP unit 2021 performs, for example, mapping between QoS flows and radio bearers, and adds an SDAP header to a packet transmitted from an upper core network, and outputs the packet to the PDCP unit 2022 .

[0086] The PDCP unit 2022 performs processing such as encryption of user data and header compression on the output of the SDAP unit 2021 , and outputs a PDCP PDU (protocol data unit) to the RLC unit 2023 .

[0087] The RLC unit 2023 performs processing such as error detection and retransmission control based on ARQ on the output of the PDCP unit 2022, and outputs an RLC PPDU.

[0088] The MAC unit 2024 performs retransmission control based on HARQ, determines the UE2 to which the communication opportunity is allocated through scheduling, and determines the MCS in the wireless transmission, generates a MAC PDU from the RLC PDU, and outputs a transport block.

[0089] Here, the MCS may be determined by using the CQI fed back from the UE 2. In the present disclosure, the MAC unit 2024 determines the MCS based on the CQI, the communication quality required for each service type, and the FH transmission quality information input from the FH quality calculation unit 204, for example.

[0090] The FH quality calculation unit (or FH quality determination unit) 204 determines FH transmission quality information based on information related to FH transmission quality measured as described below. The FH transmission quality information is an example of a signal quality indicator for the FH transmission section. As a non-limiting example, the signal-to-noise power ratio (SN) may also be used for the FH transmission quality information.

[0091] The FH transmission quality information is input to the MAC unit 2024 in at least one master station signal processing unit 202#1, for example. Additionally, the FH transmission quality information may be input to the MAC unit 2024 in another master station signal processing unit 202#j (for example, j=2) different from the master station signal processing unit 202#1.

[0092] The MAC unit 2024 calculates the transmission quality of the transmission path combining the FH transmission path and the wireless transmission path, for example, based on the wireless quality information represented by the CQI fed back from the UE2 and the FH transmission quality information. Then, the MAC unit 2024 determines the MCS, for example, so that the transmission quality of the combined transmission path when transmitting data satisfies the required quality corresponding to the service type.

[0093] As a non-limiting example, the MAC unit 2024 combines the SN ratio of the wireless transmission section and the SN ratio of the FH transmission section. The MAC unit 2024 determines an MCS suitable for a combined transmission path including the wireless transmission section and the FH transmission section based on the combined SN ratio.

[0094] Here, by allowing the signal quality in FH transmission to be reduced within a range where signal interruption does not occur, the signal redundancy in FH transmission can be reduced, and the traffic volume of FH transmission can be reduced. For example, in order to reduce the traffic volume of FH transmission, it is allowed to select a parameter that reduces the signal quality in the transmission parameters of FH transmission.

[0095] In this case, in the above-mentioned MCS determination (in other words, control of the wireless transmission method), an MCS that can compensate for the signal quality degradation allowed by FH transmission is selected, thereby ensuring the transmission quality as a wireless communication system (hereinafter sometimes referred to as a "system").

[0096] Then, the MAC unit 2024 outputs control information such as information on the determined MCS and information on resources used for wireless transmission (for example, information on resource elements (REs)) to the High-PHY block 2001 at the subsequent stage.

[0097] In the High-PHY block 2001, the coding unit 2025 adds CRC (cyclic redundancy check) coding to the transport block input from the MAC unit 2024 and divides it into code blocks. In addition, the coding unit 2025 performs rate matching corresponding to the coding and MCS of the code blocks, for example.

[0098] The scrambler 2026 performs scrambling processing on the output of the encoder 2025, for example.

[0099] The modulation unit 2027 modulates the output of the scrambler 2026 using a modulation method such as QPSK (quadrature phase shift keying), 16QAM (quadrature amplitude modulation), 64QAM, or 256QAM.

[0100] The layer mapping unit 2028 maps the output of the modulation unit 2027 to a plurality of layers, for example.

[0101] The precoding unit 2029 performs precoding on the output of the layer mapping unit 2028, for example.

[0102] The RE mapping unit 2030 maps the output of the precoding unit 2029 to a specified wireless resource (e.g., RE). 1RE is, for example, a wireless resource area of ​​1 subcarrier and 1 symbol. A resource block (RB) may also be composed of one or more REs. One or more RBs may be replaced by other terms such as a physical resource block (PRB: physical RB), a subcarrier group (SCG: sub-carrier group), a RE group (REG: resource element group), a PRB pair, and a RB pair.

[0103] In addition, the layer mapping unit 2028 and the precoding unit 2029 are used for MIMO (multiple-input and multiple-output) transmission, and therefore can be omitted when MIMO transmission is not applied. In addition, the control information used for the UE to demodulate and decode the user data signal is multiplexed with the user data signal and sent from the wireless base station 1 to the UE2. (Omitted from the diagram). For example, the user data signal is sent in the PDSCH (physical downlink shared channel), and the control information is sent in the PDCCH (physical downlink control channel). The PDSCH and PDCCH are time-division multiplexed and wirelessly transmitted through different OFDM symbols.

[0104] Next, an example of the structure of the master station signal processing unit 202#2 is described. Figure 2 As illustrated, the master station signal processing unit 202#2 includes an SDAP unit 2021 and a PDCP unit 2022. The functions of the SDAP unit 2021 and the PDCP unit 2022 may be the same or similar to those of the master station signal processing unit 202#1.

[0105] In other words, the RLC unit 2023, the MAC unit 2024, the coding unit 2025, the scrambling unit 2026, the modulation unit 2027, the layer mapping unit 2028, the precoding unit 2029, and the RE mapping unit 2030 are not configured in the master station signal processing unit 202#2. Figure 5 As described in , the functional units corresponding to the functional units 2023 to 2030 are arranged in the slave station processing device 50 (slave station signal processing unit 502 # 2 ).

[0106] Therefore, the functional division structure of the master station signal processing unit 202#2 is different from that of the master station signal processing unit 202#1. In other words, the functional division points related to the base station function in the master station signal processing unit 202#1 and the master station signal processing unit 202#2 are different from each other, or the mapping of multiple functional units in the master station signal processing unit 202#1 and the master station signal processing unit 202#2 is different.

[0107] Then, in Figure 2 In the multiplexing unit 203, the outputs of different master station signal processing units 202#1 and 202#2 are multiplexed. The multiplexed signal is output to the Figure 3 The illustrated configuration of the FH transmitter 30. As a non-limiting example, the multiplexing method of the multiplexing unit 203 may be time division multiplexing (TDM), frequency division multiplexing (FDM), code division multiplexing (CDM), or wavelength division multiplexing (WDM).

[0108] In the multiplexing unit 203, information for identifying the output signal of the master station signal processing unit 202#j (for example, signal ID#j) may also be given. For example, the output signals of the master station signal processing unit 202#j may be given signal IDs. In addition, for example, time slot information may be used in the case of TDM, frequency information may be used in the case of FDM, and wavelength information may be used in the case of WDM to respectively play the role of signal IDs.

[0109] In addition, the multiplexing unit 203 may be omitted. For example, the outputs of the different plurality of master station signal processing units 202 # 1 and # 2 may be physically separated and input to the FH transmitter 30 .

[0110] Furthermore, the master station signal processing unit 202#1 and the master station signal processing unit 202#2 may be implemented by physically different devices, or may be logically divided and implemented in the same device using, for example, virtualization technology. The logically divided structure may be called a "slice".

[0111] In addition, the number of the master station signal processing units 202#j may be greater than 2 as described above, and in the case of logical division, it may also be changed dynamically or adaptively. For example, in the case where the type of service supported by the wireless base station 1 changes, by increasing or decreasing the number of slices according to the change, a structure suitable for the type of service can be realized.

[0112] For example, in the wireless base station 1, slices suitable for the supported service type, such as slices for eMBB, slices for URLLC, or slices for mMTC, can be added or deleted as needed. Therefore, a base station structure suitable for the service type can be flexibly implemented.

[0113] Alternatively, the configuration of the master station signal processing unit 202#2 may be realized by omitting a portion of the processing of the master station signal processing unit 202#1 according to the service type. In other words, a plurality of master station signal processing units 202 may be realized by omitting or skipping a portion of the processing based on a plurality of functional units constituting one master station signal processing unit 202. This also applies to other embodiments 2 to 4 described later.

[0114] In the case of the presence or absence of the MAC unit 2024, by Figure 2 The master station device 11 of the described configuration is a configuration in which the MAC unit 2024 is included in the master station signal processing unit 202 # 1 , and is a configuration in which the MAC unit 2024 is not included in the master station signal processing unit 202 # 2 .

[0115] In the master station signal processing unit 202#1 including the MAC unit 2024, FH transmission with a smaller redundancy than that of the master station signal processing unit 202#2 can be applied (or set). In contrast, in the master station signal processing unit 202#2 not including the MAC unit 2024, the redundancy is greater, in other words, a more robust FH transmission can be applied (or set).

[0116] Thus, in Embodiment 1, appropriate FH transmission corresponding to the difference in the functional division structure of the master station signal processing units 202#1 and 202#2 can be applied to the master station signal processing units 202#1 and 202#2 separately. In other words, according to Embodiment 1, it is possible to optimize or optimize the FH transmission corresponding to the service type #j. Therefore, for example, it is possible to avoid applying excessive redundancy to the signal transmitted in FH13 in either of the master station signal processing units 202#1 and 202#2.

[0117] (FH transmitter 30)

[0118] Next, refer to Figure 3 , an example of the structure of the FH transmitter 30 is described. Figure 3 As shown, the FH transmitter 30 includes, for example, a demultiplexing unit 301 , FH transmission processing units 302 - 1 and 302 - 2 corresponding to the service type, a multiplexing unit 303 , a transmission unit (Tx) 304 , a reception unit (Rx) 305 , a measurement unit 306 , and a control unit 307 .

[0119] In addition, the FH transmission processing units 302-1 and 302-2 are sometimes labeled as FH transmission processing units 302#1 and 302#2, respectively. In addition, when the FH transmission processing units 302-1 and 302-2 are not distinguished, they are sometimes labeled as FH transmission processing units 302. The number of FH transmission processing units 302 included in the FH transmitter 30 is not limited to 2, and may be 3 or more. For example, N FH transmission processing units 302 corresponding to the number N of service types may be labeled as FH transmission processing units 302#j (j=1 to N).

[0120] The FH transmission processing unit 302 # 1 and the FH transmission processing unit 302 # 2 may be implemented by physically different devices, or may be implemented by software or hardware circuit division within the same device, for example.

[0121] The separation unit 301 separates the signal received from the FH 13 to different master station signal processing units 202#j, for example. When the signal received from the FH 13 is a multiplexed signal, the separation unit 301 identifies and separates the reception signal for each master station signal processing unit 202#j based on the aforementioned signal ID, for example.

[0122] The receiving unit 305 receives, for example, the data from the slave station device 12 (for example, Figure 4 A known signal (eg, a training signal) transmitted by an FH receiver 40 (described later) and transmitted in the FH 13 is output to the measuring unit 306 .

[0123] The measurement unit 306 measures the reception quality of the known signal input from the reception unit 305 , and outputs the quality measurement result to, for example, the control unit 307 .

[0124] Based on the quality measurement results of the measuring unit 306, the control unit 307 determines the FH transmission parameters (for example, one or more of the code type, coding rate, and modulation multi-value number) #j corresponding to the master station signal processing unit 202 #j, and outputs them to the FH transmission processing units 302 #1 and 302 #2.

[0125] In addition, the control unit 307 may encode and modulate the control information sent to the slave station device 12 and output it to the multiplexing unit 303. The control information may include, for example, the determined FH transmission parameter. Additionally or alternatively, the quality measurement result of the measurement unit 306 may be included in the control information.

[0126] The FH transmission processing units 302 # 1 and 302 # 2 each include, for example, an encoding unit 3021 and a modulation unit 3022 .

[0127] The encoding unit 3021 encodes the signal corresponding to the master station signal processing unit 202 #j separated and output by the separation unit 301 , for example, based on the FH transmission parameter #j from the control unit 307 .

[0128] The modulation unit 3022 modulates the output of the coding unit 3021 using a modulation method (for example, any one of QPSK, 16QAM, 64QAM, and 256QAM) based on the FH transmission parameter #j from the control unit 307, for example.

[0129] The multiplexing unit 303 multiplexes the signals of the different FH transmission processing units 302#j with the control information from the control unit 307, and outputs the multiplexing to the transmission unit 304. The multiplexing method in the multiplexing unit 303 may be any of TDM, FDM, CDM and WDM as a non-limiting example.

[0130] In the multiplexing unit 303, information for identifying the output signal of the master station signal processing unit 202#j (for example, signal ID#j) may also be assigned. For example, the output signal of the master station signal processing unit 202#j may be assigned a signal ID. In addition, for example, the time slot information is used in the case of TDM, the frequency information is used in the case of FDM, the code information is used in the case of CDM, and the wavelength information is used in the case of WDM to respectively play the role of the signal ID.

[0131] The transmission unit 304 performs transmission processing corresponding to a wired transmission unit (or a wired interface) such as a UTP cable, an STP cable, or an optical fiber cable on the output of the multiplexing unit 303, and transmits it to the FH 13.

[0132] In addition, the measurement unit 306 of the FH transmitter 30 may also include the FH quality calculation unit 204 (see Figure 2 In this case, the master station processing device 20 may not include the FH quality calculation unit 204.

[0133] In addition, the FH quality calculation unit 204 of the master station processing device 20 and the control unit 307 of the FH transmitter 30 may be integrally configured as one control unit. For example, the function of one of the FH quality calculation unit 204 and the control unit 307 may be included in the other of the FH quality calculation unit 204 and the control unit 307. In addition, the measurement unit 306 of the FH transmitter 30 may also be included in the control unit 307.

[0134] In other words, the functions of the FH quality calculation unit 204 , the measurement unit 306 , and the control unit 307 may be provided in the master station device 11 .

[0135] In addition, the FH transmitter 30 may be implemented in a device 20 that is physically the same as the master station processing device 20. In this case, for example, the multiplexing unit 203 and the separation unit 301 may not be necessary. For example, signals of different master station signal processing units 202#j corresponding to service types may be processed in parallel in one device 20.

[0136] <Slave Station Device 12>

[0137] Next, an example of the configuration of the slave station device 12 will be described.

[0138] (FH Receiver 40)

[0139] Figure 4 : is a block diagram showing an example of the structure of the FH receiver 40.

[0140] like Figure 4 As shown, the FH receiver 40, for example, includes a receiving unit 401, a separating unit 402, FH receiving processing units 403-1, 403-2 corresponding to the main station signal processing units 202#1 and #2 (in other words, multiple service types #1 and #2), a multiplexing unit 404, a control unit 405, a training data unit 406 and a sending unit 407.

[0141] In addition, the FH reception processing units 403-1 and 403-2 are sometimes labeled as FH reception processing units 403#1 and 403#2, respectively. In addition, when the FH reception processing units 403-1 and 403-2 are not distinguished, they are sometimes labeled as FH reception processing units 403. The number of FH reception processing units 403 included in the FH receiver 40 is not limited to 2, and may be 3 or more. For example, N FH reception processing units 403 corresponding to the number N of service types may be labeled as FH reception processing units 403#j (j is j=1 to N).

[0142] The FH reception processing unit 403 # 1 and the FH reception processing unit 403 # 2 may be implemented by physically different devices, or may be implemented by being divided into software or hardware circuits in the same device, for example.

[0143] The receiving unit 401 performs reception processing corresponding to a wired transmission unit (or a wired interface) such as a UTP cable, an STP cable, or an optical fiber cable on the signal received from the FH 13 , and outputs the signal to the separating unit 402 .

[0144] The separator 402 separates signals corresponding to different multiple master station signal processing units 202#j from the output of the receiving unit 401, for example, based on the aforementioned signal ID, and outputs the signals to the FH receiving processing unit 403#j. In addition, the separator 402 separates control information multiplexed in the FH transmitter 30 from the output of the receiving unit 401, for example, and outputs the control information to the control unit 405.

[0145] The control unit 405 decodes the control information (for example, the FH transmission parameters #j corresponding to the master station signal processing units 202 #j) input from the separation unit 402, and outputs the decoded information to the FH reception processing unit 403 #j.

[0146] The FH reception processing unit 403 #j includes a demodulation unit 4031 and a decoding unit 4032 .

[0147] The demodulation unit 4031 demodulates the output of the separation unit 402 based on, for example, control information (for example, FH transmission parameter #j) from the control unit 405 .

[0148] The decoding unit 4032 decodes the output of the demodulation unit 4031 based on, for example, control information (for example, FH transmission parameter #j) from the control unit 405 .

[0149] The multiplexing unit 404, for example, multiplexes the outputs of different FH receiving processing units 403#j and outputs them to the substation processing device 50. The signal multiplexed in the multiplexing unit 404 can also be understood as being equivalent to being sent to different substation signal processing units (for example, Figure 5 The signal of the slave station signal processing unit 502#1 and 502#2) described later.

[0150] In addition, in the multiplexing method of the multiplexing unit 404, as a non-limiting example, TDM, FDM, CDM or WDM may also be applied. In the multiplexing unit 404, information for identifying the output signal of the FH receiving processing unit 403#j (for example, signal ID#j) may also be given. For example, the output signal of the FH receiving processing unit 403#j may also be given a signal ID. In addition, for example, in the case of TDM, time slot information is used, in the case of FDM, frequency information is used, and in the case of WDM, wavelength information is used to respectively play the role of signal ID.

[0151] In addition, the multiplexing unit 404 may be omitted. For example, the outputs of the different FH reception processing units 403 # 1 and 403 # 2 may be physically separated and input to the slave station processing device 50 .

[0152] The training data unit 406 generates a known signal for measuring the transmission quality of FH13 and outputs it to the transmission unit 407. The so-called "known signal" is, for example, a training signal (or data) used in a predetermined sequence between a transmitter and a receiver. The training signal may also be replaced by other names such as a pilot signal or a reference signal.

[0153] The transmission unit 407 transmits the training signal to the FH 13 connected to the master station device 11 (for example, the FH transmitter 30). The training signal transmitted to the FH 13 is received by the reception unit 305 (see FIG. 10 ) of the FH transmitter 30 in the master station device 11. Figure 3 )take over.

[0154] Alternatively, the transmission quality measurement of the FH 13 using a known signal may be performed by transmitting the known signal from the FH transmitter 30 to the FH receiver 40 , measuring the transmission quality of the FH 13 in the FH receiver 40 , and feeding back the measurement result to the FH transmitter 30 .

[0155] In addition, part or all of the control unit 405 , the training data unit 406 , and the transmission unit 407 may not be provided inside the FH receiver 40 , but may be provided inside the slave station device 12 .

[0156] (Substation processing device 50)

[0157] Next, refer to Figure 5 , an example of the structure of the slave station processing device 50 is described.

[0158] like Figure 5 As illustrated, the slave station processing device 50 includes, for example, a separation unit 501 , slave station signal processing units 502 - 1 and 502 - 2 , a D / A (digital to analog) converter 503 , and an RF (radio frequency) unit 504 .

[0159] In addition, the substation signal processing units 502-1 and 502-2 are sometimes labeled as substation signal processing units 502#1 and 502#2, respectively. In addition, when the substation signal processing units 502-1 and 502-2 are not distinguished, they are sometimes labeled as substation signal processing units 502. The number of substation signal processing units 502 provided in the substation processing device 50 is not limited to 2, and may be 3 or more. For example, N substation signal processing units 502 corresponding to the number N of service types may be labeled as substation signal processing units 502#j (j=1 to N).

[0160] The slave station signal processing unit 502#1 and the slave station signal processing unit 502#2 may be implemented by physically different devices, or may be implemented by being divided into logical slices, for example.

[0161] The separation unit 501 separates the signals sent to a plurality of different slave station signal processing units 502#j based on a known signal ID, for example, and outputs the separated signals to the corresponding slave station signal processing units 502#j.

[0162] like Figure 2 As described in , since the master station signal processing units 202-1 and 202-2 have different functional division structures (in other words, different functional division points), the slave station signal processing units 502-1 and 502-2 have different functional division structures.

[0163] For example, the slave station signal processing unit 502-1 includes a beamforming unit 5029 and an IFFT+CP (cyclic prefix) unit 5030 according to the functional division point in the master station signal processing unit 202-1 corresponding to the service type #1.

[0164] In contrast, the substation signal processing unit 502-2 includes, according to the functional division point in the main station signal processing unit 202-2 corresponding to the service type #2, an RLC unit 5021, a MAC unit 5022, a coding unit 5023, an scrambling unit 5024, a modulation unit 5025, a layer mapping unit 5026, a precoding unit 5027, an RE mapping unit 5028, a beamforming unit 5029 and an IFFT+CP unit 5030.

[0165] In the slave station signal processing unit 502 - 1 , the beamforming unit 5029 and the IFFT+CP unit 5030 form, for example, a lower physical layer (Low-PHY) block 5002 .

[0166] The beamforming unit 5029 of the slave station signal processing unit 502 - 1 performs beamforming processing on the output of the separation unit 501 , for example.

[0167] The IFFT+CP unit 5030 of the slave station signal processing unit 502 - 1 performs IFFT and CP insertion on the output of the beamforming unit 5029 , for example.

[0168] On the other hand, in the slave station signal processing unit 502-2, the functional units 5021 to 5028 constitute, for example, a High-PHY block 5001. Also, in the slave station signal processing unit 502-2, the beamforming unit 5029 and the IFFT+CP unit 5030 constitute, for example, a Low-PHY block 5002.

[0169] The functional units 5021 to 5028 of the slave station signal processing unit 502-2 can be understood as being identical to the functional units 2023 to 2030 in the master station signal processing unit 202-1 (see Figure 2 )same.

[0170] The beamforming unit 5029 of the slave station signal processing unit 502 - 2 performs beamforming processing on the output of the RE mapping unit 5028 , for example.

[0171] The IFFT+CP unit 5030 of the slave station signal processing unit 502 - 2 performs IFFT and CP insertion on the output of the beamforming unit 5029 of the slave station signal processing unit 502 - 2 , for example.

[0172] For example, the D / A converter 503 converts the outputs of the slave station signal processing units 502 # 1 and 502 # 2 (the outputs of the two IFFT+CP units 5030 ) from digital signals to analog signals.

[0173] The RF unit 504 performs transmission RF processing such as up-conversion to a radio frequency and amplification on the output of the D / A converter 503. The wireless signal generated by the transmission RF processing is transmitted to space (for example, to UE2) via an antenna (not shown) provided by the RF unit 504.

[0174] The Low-PHY block 5002 may be used alone or in common in the slave station signal processing units 502 # 1 and 502 # 2. In the case of common use, the processing of different slave station signal processing units 502 may be performed in parallel in one Low-PHY block 5002 .

[0175] in addition, Figure 4 The FH receiver 40 described above may also be implemented in a device 50 that is physically the same as the slave station processing device 50. In this case, for example, the multiplexing unit 404 and the separation unit 501 may not be provided. For example, signals of different slave station signal processing units 502#j corresponding to service type #j may be processed in parallel in one device.

[0176] Furthermore, the slave station signal processing unit 502#1 and the slave station signal processing unit 502#2 may be implemented by physically different devices, or may be implemented by logically dividing them within the same device using virtualization technology, for example.

[0177] In addition, the number of the slave station signal processing units 502#j may be greater than 2, and in the case of logical division, may be changed dynamically or appropriately. For example, as described above, when the type of service supported by the wireless base station 1 changes, the number of slices #j corresponding to the slave station signal processing unit 502#j may be increased or decreased in correspondence with the increase or decrease of the slices #j corresponding to the master station signal processing unit 202#j.

[0178] in addition, Figure 5One or both of the D / A converter 503 and the RF unit 504 described as an example may be independently provided for a plurality of different slave station signal processing units 502 #j.

[0179] In addition, at least one of the master station processing device 20 and the slave station processing device 50 may be configured by a logical slice. In addition, at least one of the master station device 11 and the slave station device 12 may also be configured by a logical slice.

[0180] In addition, depending on the service type, a part of the processing of the substation signal processing unit 502#1 may be omitted, thereby realizing the configuration of the substation signal processing unit 502#2. In other words, multiple substation signal processing units 502 may be realized by omitting or skipping a part of the processing based on multiple functional units constituting one substation signal processing unit 502. This also applies to other embodiments 2 to 4 described later.

[0181] (Action Example)

[0182] Next, refer to Figure 6 The timing diagram of is used to illustrate an example of the operation of the wireless communication system involved in implementation mode 1.

[0183] like Figure 6 In the wireless base station 1, the transmitter 407 (see Figure 4 ) sends a known signal to the FH transmitter 30 (S601). The known signal can be sent at a predetermined timing when the wireless communication system is started or after it is started. For example, in order to avoid the shortage of the FH frequency band, the predetermined timing can also be set to a time period when the traffic volume of the FH 13 is relatively low (for example, in the morning or late at night, etc.).

[0184] The known signal is, for example, received by the receiving unit 305 of the FH transmitter 30 (see Figure 3 ) is received and input to the measuring unit 306. The measuring unit 306 measures the reception quality of the input known signal (S602).

[0185] The information indicating the measurement result (measurement information) is input to the control unit 307 of the FH transmitter 30 (see Figure 3 ) and the FH quality calculation unit 204 of the master station processing device 20 (refer to Figure 2 )(S603a and S603b).

[0186] In the master station processing device 20 , the FH quality calculation unit 204 determines FH transmission quality information based on the input measurement information, and outputs the information to, for example, the MAC unit 2024 of the master station signal processing unit 202 # 1 .

[0187] The MAC unit 2024 calculates and determines the transmission quality of the transmission path combining the wireless transmission path and the FH transmission path based on, for example, the CQI (not shown) fed back from the UE, the communication quality required for each service type, and the FH transmission quality information (S604).

[0188] Then, the MAC unit 2024 determines the MCS of the wireless transmission section to be an MCS at which the signal quality when data is transmitted through the combined transmission path satisfies the required quality according to the service type, for example.

[0189] As a non-limiting example, the MAC unit 2024 combines the SN ratio of the wireless transmission section and the SN ratio of the FH transmission section, and determines the MCS applied to the combined transmission path including the wireless transmission section and the FH transmission section based on the combined SN ratio (S606).

[0190] On the other hand, in the FH transmitter 30, the control unit 307 to which the measurement information is input determines the transmission method of the FH transmission, in other words, the FH transmission parameters (for example, one or more of the code type, the coding rate, and the modulation multi-value number) used in the FH transmission based on the measurement information (S605). In addition, the determination processing of S605 and S606 can be performed at the same timing or at different (or offset) timings.

[0191] The master station signal processing unit 202#1 encodes and modulates the DL signal of service type #1 (e.g., user data processed by the SDAP unit 2021 and the PDCP unit 2022) according to the MCS determined in S606, and outputs it to the FH transmitter 30 (S607). In contrast, the master station signal processing unit 202#2 outputs the DL signal corresponding to service type #2 (e.g., user data processed by the SDAP unit 2021 and the PDCP unit 2022) to the FH transmitter 30 (S607).

[0192] In the FH transmitter 30, user data corresponding to service types #1 and #2 (hereinafter also referred to as "DL data") are encoded and modulated in the corresponding FH transmission processing units 302#1 and 302#2 according to the FH transmission parameters determined in S605, and then transmitted to the FH13 (S608).

[0193] The DL data transmitted from the master station 11 to the FH 13 is received by the receiving unit 401 of the FH receiver 40 in the slave station 12 , and is demodulated and decoded by the service types # 1 and # 2 in the FH reception processing unit 403 .

[0194] The DL data demodulated and decoded in the FH receiver 40 is sent to the slave station processing device 50 (S609). In the slave station processing device (50), the DL data received from the FH receiver (40) is processed by the slave station signal processing units 502#1 and 502#2 according to service types #1 and #2, respectively.

[0195] For example, the slave station signal processing unit 502#1 performs beamforming processing and IFFT (+CP) processing on the received DL data corresponding to the service type #1. The DL data subjected to each processing is transmitted from the antenna to the UE2 via a wireless signal (S610).

[0196] On the other hand, the substation signal processing unit 502#2 performs RLC, MAC, coding, scrambling, modulation, layer mapping, precoding, RE mapping, beamforming, and IFFT (+CP) processing on the DL data corresponding to service type #2. The DL data after each processing is transmitted from the antenna to UE2 via a wireless signal (S610).

[0197] According to the first embodiment, since the function division structure of the master station device 11 and the slave station device 12 is different according to the service type, the traffic volume of FH13 can be effectively reduced. In addition, the transmission method using FH transmission can be distinguished according to the difference in the function division structure of the master station device 11 and the slave station device 12 (in other words, the FH transmission method can be optimized for each service type). Therefore, for example, the redundancy of data in FH transmission can be reduced, and the traffic volume of FH13 can be reduced.

[0198] In addition, when it is permitted to select parameters with low redundancy (signal quality reduction) in FH transmission parameters in order to control the traffic volume of FH transmission, the permitted signal quality reduction can be compensated by controlling the wireless transmission method (for example, wireless transmission parameters such as MCS). Therefore, the transmission quality as a wireless communication system can be guaranteed.

[0199] (Implementation Method 2)

[0200] Next, embodiment 2 will be described. Figure 7 This is a block diagram showing an example of the configuration of the master station processing device 20 included in the master station device 11 according to the second embodiment. Figure 8 This is a block diagram showing an example of the configuration of the FH transmitter 30 included in the master station device 11 according to the second embodiment.

[0201] In addition, an example of the configuration of the FH receiver 40 and the slave station processing device 50 in the slave station device 12 according to the second embodiment can be respectively the same as that in the first embodiment. Figure 4 as well as Figure 5 The illustrated structures are the same or identical.

[0202] exist Figure 7 The master station processing device 20 is shown in FIG. Figure 2 The difference from the illustrated master station processing device 20 is that a target quality setting unit 205 is provided instead of the FH quality calculation unit 204 .

[0203] In addition, Figure 8 The exemplary FH transmitter 30 is similar to the Figure 3 Compared with the exemplified FH transmitter 30, the output of the target quality setting unit 205 (e.g., setting information (or requirement information) related to the target quality) is input to the control unit 307. For convenience, the setting information (or requirement information) related to the target quality is simply referred to as "target quality information".

[0204] Next, implementation method 2 is described with a focus on the above-mentioned different points (or differences).

[0205] exist Figure 7 The target quality setting unit 205 exemplarily generates target quality information for FH 13. The target quality information may be specified in advance as information indicating the quality set or required for FH 13 according to the quality requirement for each service type, or may be notified from the core network 11.

[0206] The target quality information is sent, for example, to Figure 7 The MAC unit 2024 in at least one master station signal processing unit 202#1 and Figure 8 The target quality information transmitted to the FH transmitter 30 may be multiplexed with the DL data transmitted to the FH transmitter 30 in the multiplexing unit 203, or may not be multiplexed with the DL data transmitted to the FH transmitter 30. When not multiplexed with the DL data, the target quality information may be transmitted to the FH transmitter 30 bypassing the multiplexing unit 203.

[0207] The MAC unit 2024 to which the target quality information is input determines the MCS to be applied to the DL data of the service type #1 based on, for example, the CQI and the target quality information.

[0208] On the other hand, Figure 8 In the illustrated FH transmitter 30, the target quality information is received by the control unit 307. When the target quality information is multiplexed with the DL data, the target quality information is separated in the separation unit 301 and input to the control unit 307. On the other hand, when the target quality information is not multiplexed with the DL data, the target quality information is input to the control unit 307 without passing through the separation unit 301.

[0209] exist Figure 8 The control unit 307 illustrated in the example determines the FH transmission parameters (for example, one or more of the code type, coding rate, and modulation multi-value number) #j corresponding to the master station signal processing units 202 #j, respectively, based on the target quality information and the measurement information related to the transmission quality of FH13 of the measurement unit 306. The determined FH transmission parameters #j are output to the corresponding FH transmission processing units 302 #1 and 302 #2.

[0210] In addition, the control unit 307 may encode and modulate the control information sent to the slave station device 12 and output it to the multiplexing unit 303. The control information may include, for example, the determined FH transmission parameter. Additionally or alternatively, the control information may include at least one of the target quality information and the quality measurement result based on the measurement unit 306.

[0211] The FH transmission processing unit 302 (#j) performs encoding and modulation of DL data in the encoding unit 3021 and the modulation unit 3022, respectively, according to the FH transmission parameter #j determined based on the target quality information. Thus, encoding and modulation suitable for FH transmission are performed on the DL data for each service type #j.

[0212] In other words, based on the target quality information, the FH transmission quality of each service type #j is controlled in the FH transmitter 30. Therefore, the target quality information can also be understood as an example of control information for controlling the transmission quality of the FH 13.

[0213] (Action Example)

[0214] Next, refer to Fig. 9 A timing diagram illustrating an example of the operation of the wireless communication system involved in Implementation Example 2.

[0215] like Fig. 9 As illustrated, in the master station processing device 20 of the master station device 11, the target quality setting unit 205 determines the target quality information (S901).

[0216] The determined target quality information is sent to the Figure 7 The MAC unit 2024 and the Figure 8 The control unit 307 in the illustrated FH transmitter 30 (S902a and S902b).

[0217] Then, the FH transmitter 30 receives the known signal transmitted from the FH receiver 40 in the slave station device 12 to the FH 13 and transmitted in the FH 13 (S903). The FH transmitter 30 measures the reception quality of the known signal transmitted in the FH 13 and outputs the measurement result to the control unit 307 (S904a).

[0218] The control unit 307 determines the FH transmission parameters #j corresponding to the master station signal processing units 202 #j, respectively, based on the target quality information received in S902b and the measurement results of the measurement unit 306 (S905). The determined FH transmission parameters #j are input to the corresponding FH transmission processing units 302 #j.

[0219] On the other hand, in the master station processing device 20, the MAC unit 2024 of the master station signal processing unit 202#1 determines the transmission quality of the transmission path combining the wireless transmission path and the FH transmission path, for example, based on the CQI fed back from the UE2 and the target quality information input in S902a. Then, the MAC unit 2024 determines the MCS of the wireless transmission section to be the MCS that satisfies the required quality according to the service type when the signal quality in the case of transmitting data in the combined transmission path (S906).

[0220] In addition, the reception timing ( S903 ) and measurement timing ( S904 ) of the known signal in the FH transmitter 30 may be after the reception timing ( S902 b ) of the target quality information or before the reception timing ( S902 b ) of the target quality information.

[0221] In addition, the determination processing of S905 and S906 may be executed at the same timing or at different (or deviated) timings.

[0222] The master station signal processing unit 202#1 encodes and modulates the DL signal of service type #1 (e.g., user data processed by the SDAP unit 2021 and the PDCP unit 2022) according to the MCS determined in S906, and outputs the DL signal to the FH transmitter 30 (S907). In contrast, the master station signal processing unit 202#2 outputs the DL signal corresponding to service type #2 (e.g., user data processed by the SDAP unit 2021 and the PDCP unit 2022) to the FH transmitter 30 (S907).

[0223] In the FH transmitter 30, user data corresponding to service types #1 and #2 (hereinafter also referred to as "DL data") are encoded and modulated in the corresponding FH transmission processing units 302 #1 and #2 according to the FH transmission parameters determined in S905, and then transmitted to the FH 13 (S908).

[0224] The subsequent DL data transmission processing S909 and S910 by the slave station device 12 (FH receiver 40 and slave station processing device 50) can be respectively performed in the same manner as in the first embodiment. Figure 6 The processes S609 and S610 described in are equivalent.

[0225] As described above, according to the second embodiment, in addition to being able to obtain the same effects as those of the first embodiment, it is possible to eliminate the need for the FH transmitter 30 to feed back the measurement results related to the FH transmission quality to the master station processing device 20 as described in the first embodiment. Therefore, the utilization efficiency of the FH band can be improved.

[0226] In Embodiment 2, feedback on the measurement result of the FH transmission quality may also be used. By implementing this feedback, for example, the master station processing device 20 can compensate for the deviation or fluctuation of the FH transmission quality from the target quality.

[0227] In addition, the target quality setting unit 205 of the master station processing device 20 and the control unit 307 of the FH transmitter 30 may be integrally configured as one control unit. For example, the function of one of the target quality setting unit 205 and the control unit 307 may be included in the other of the target quality setting unit 205 and the control unit 307. In addition, the measurement unit 306 of the FH transmitter 30 may also be included in the control unit 307.

[0228] In other words, in the second embodiment, the functions of the target quality setting unit 205 , the measuring unit 306 , and the control unit 307 may be provided in the master station device 11 .

[0229] (Implementation 3)

[0230] Next, Embodiment 3 is described. In Embodiment 3, in the measurement of FH transmission quality, for example, a CRC result based on DL data or acknowledgment response (Ack / Nack) information of the CRC result is used instead of a known signal such as a training signal.

[0231] Fig.10 1 is a block diagram showing an example of the configuration of the FH receiver 40 included in the slave station device 12 according to the third embodiment. Fig.10 The exemplary FH receiver 40 is connected to the Figure 4 The difference from the illustrated configuration is that an Ack / Nack calculation unit 408 is provided instead of the training data unit 406 .

[0232] In the third embodiment, the configuration of the master station device 11 (master station processing device 20 and FH transmitter 30) may be different from that of the first embodiment. Figure 2 as well as Figure 3 In the third embodiment, the structure of the substation processing device 50 provided in the substation device 12 may be the same as that of the first embodiment. Figure 5 The structures shown in the examples are the same or the same.

[0233] Next, the third embodiment will be described with a focus on the differences (or distinctions) from the first embodiment.

[0234] exist Fig.10 The illustrated Ack / Nack calculation unit 408 receives information (Ack / Nack information) indicating a positive response (Ack) or a negative response (Nack) from the decoding units 4032 of the slave station signal processing units 502#1 and 502#2. The Ack / Nack information is generated based on the determination of the CRC result in the decoding units 4032 of the slave station signal processing units 502#1 and 502#2, for example.

[0235] The Ack / Nack calculation unit 408 calculates statistics of Ack / Nack information (for example, at least one of the Ack rate and the Nack rate) over a specific time. The Ack / Nack statistical information as the calculation result is transmitted (fed back) from the transmission unit 407 to the FH transmitter 30 of the master station device 11, for example.

[0236] In addition, the Ack / Nack statistical information indicates, for example, that the higher the Ack rate (or the lower the Nack rate), the higher the FH transmission quality, and the higher the Nack rate (or the lower the Ack rate), the lower the FH transmission quality. Therefore, the Ack / Nack statistical information can be understood as an example of FH transmission quality information.

[0237] For example, in Figure 3 The receiving unit 305 of the illustrated FH transmitter 30 receives the Ack / Nack statistical information fed back to the master station device 11. The receiving unit 305 outputs the received Ack / Nack statistical information to the measuring unit 306.

[0238] The measurement unit 306 determines or decides the transmission quality of the FH 13 based on the Ack / Nack statistical information. In addition, the determination or decision of the transmission quality of the FH 13 may be performed in the Ack / Nack calculation unit 408. In this case, instead of the Ack / Nack statistical information, the result of the determination or decision of the FH transmission quality may be sent (fed back) from the transmission unit 407 to the FH transmitter 30 of the master station device 11 as an example of the FH transmission quality information.

[0239] (Action Example)

[0240] Next, refer to Fig.11 A timing diagram illustrating an example of the operation of the wireless communication system involved in Implementation Example 3.

[0241] like Fig.11As shown, at a certain timing, the master station processing device 20 of the wireless base station 1 transmits user data (DL data) received from the upper core network to the FH transmitter 30 (S1101). The FH transmitter 30 transmits the received DL data to the slave station device 12 via the FH 13 (S1102).

[0242] In the slave station device 12, the DL data transmitted in the FH 13 is received in the FH receiver 40. In the FH receiver 40, the DL data is separated by service type #j in the separation unit 402, and decoded in the corresponding decoding unit (4032).

[0243] At this time, the decoding unit 4032 performs CRC determination of the DL data (S1103), and generates Ack / Nack information based on the CRC determination result. In addition, the decoded DL data is sent from the FH receiver 40 to the slave station processing device 50 (S1104), and the slave station processing device 50 sends the received DL data to UE2 via a wireless signal (S1105).

[0244] The Ack / Nack information generated in the decoding unit 4032 is input to the Ack / Nack calculation unit 408. The Ack / Nack calculation unit 408 calculates statistics of the input Ack / Nack information (S1106).

[0245] In addition, after calculating the statistics of Ack / Nack information (S1106), DL data may be transmitted from the FH receiver 40 to the slave station processing device 50. In addition, the Ack / Nack statistics information may be updated by sequentially repeating the CRC determination of DL data (S1103) and the Ack / Nack statistics calculation (S1106).

[0246] The Ack / Nack statistical information obtained by the Ack / Nack calculation unit 408 is transmitted (fed back) from the transmission unit 407 of the FH receiver 40 to the master station device 11 via the FH 13 (S1107).

[0247] The Ack / Nack statistical information fed back to the master station device 11 is received by the receiving unit 305 of the FH transmitter 30 (for example, see Figure 3 ) is received. The Ack / Nack statistical information received in the receiving unit 305 is input to the measuring unit 306.

[0248] The measurement unit 306 determines or decides the FH transmission quality based on the Ack / Nack statistical information, and outputs the result (FH transmission quality information) to the control unit 307 of the FH transmitter 30. The FH transmission quality information is also sent from the measurement unit 306 to the master station processing device 20 (S1108).

[0249] The control unit 307 determines the transmission method of FH transmission, in other words, the transmission parameters used for FH transmission (for example, one or more of code type, coding rate, and modulation multi-value number) based on the FH transmission quality information (S1109).

[0250] In the master station processing device 20, the MAC unit 2024 of the master station signal processing unit 202#1 determines the transmission quality of the transmission path obtained by combining the wireless transmission path and the FH transmission path, for example, based on the CQI fed back from the UE 2, the required quality for each service type, and the FH transmission quality information. Then, the MAC unit 2024 determines the MCS of the wireless transmission section to be the MCS in which the signal quality when the combined transmission path transmits data satisfies the required quality corresponding to the service type (S1110).

[0251] In addition, the decision processing of S1109 and S1110 may be executed at the same timing as each other, or may be executed at different (or deviated) timings from each other.

[0252] The master station signal processing unit 202#1 encodes and modulates the DL signal of service type #1 (e.g., DL data processed by the SDAP unit 2021 and the PDCP unit 2022) according to the MCS determined in S1110, and outputs it to the FH transmitter 30 (S1111). On the other hand, the master station signal processing unit 202#2 outputs the DL signal corresponding to service type #2 (e.g., DL data processed by the SDAP unit 2021 and the PDCP unit 2022) to the FH transmitter 30 (S1111).

[0253] In the FH transmitter 30, DL data corresponding to service types #1 and #2 are encoded and modulated in the corresponding FH transmission processing units 302#1 and 302#2 according to the FH transmission parameters determined in S1109 and then transmitted to the FH 13 (S1112).

[0254] The subsequent DL data transmission processing S1113 and S1114 by the slave station device 12 (FH receiver 40 and slave station processing device 50) may be respectively performed in the same manner as in the first embodiment. Figure 6 The processing S609 and S610 described in are equivalent.

[0255] As described above, according to Embodiment 3, in addition to achieving the same effects as those of Embodiment 1, it is possible to eliminate the need for transmission and reception of known signals for FH transmission quality measurement in Embodiment 1. Therefore, it is possible to improve the utilization efficiency of the FH band.

[0256] In addition, in Embodiment 3, the FH transmission quality measurement using the known signal in Embodiment 1 may also be used in combination. For example, the FH transmission quality measurement using the known signal may be performed in advance, and the Ack / Nack statistical information may be used to correct the fluctuation that may occur in the measurement result. In addition, the Ack / Nack statistical information may be notified to the master station device 20, and the master station device 20 may correct the wireless transmission method based on the Ack / Nack statistical information and update it.

[0257] Here, pre-implementing FH transmission quality measurement means, for example, CRC determination at system startup (see Fig.11 The FH transmission quality measurement is implemented regularly before S1103).

[0258] In addition, the function of the Ack / Nack calculation unit 408 of the FH receiver 40 may be included in the control unit 405. In addition, the Ack / Nack calculation unit 408 may be provided outside the FH receiver 40 or in the slave station device 12.

[0259] (Implementation 4)

[0260] Next, Embodiment 4 is described. In Embodiment 4, Figure 12 to Figure 16 An example of the UL configuration of the wireless base station 1 in the first embodiment will be described with attention paid to it.

[0261] Fig.12 FIG. 4 is a diagram showing an example of a configuration of a wireless communication system according to Embodiment 4. Figure 1 The wireless base station 1 illustrated in FIG. 1 includes a slave station processing device 60 and an FH transmitter 70 in the slave station device 12 , and includes an FH receiver 80 and a master station processing device 90 in the master station device 11 .

[0262] Also, similar to Embodiments 1 to 3, the number of wireless base stations 1 and UEs 2 may be 2 or more. In the master station device 11, the DL master station processing device 20 and the UL master station processing device 90 may be configured as physically different devices or implemented in the same physically different device.

[0263] Similarly, the DL FH transmitter 30 and the UL FH receiver 80 may be configured as physically different devices or implemented in the same physically device. In addition, the FH transmitter 30 and the FH receiver 80 may be integrated as a FH transmission and reception device or FH communication device shared by DL and UL, for example.

[0264] Similarly, regarding the slave station device 12, the DL FH receiver 40 and the UL FH transmitter 70 may be configured as physically different devices or implemented in the physically same device. In addition, the FH receiver 40 and the FH transmitter 70 may be integrated as, for example, a DL and UL common FH transmission and reception device or an FH communication device.

[0265] In addition, the DL station processing device 50 and the UL station processing device 60 may be configured as physically different devices, or may be implemented in the physically same device.

[0266] Furthermore, in the master station device 11 , at least one of the DL master station processing device 20 and the UL master station processing device 90 may be configured by logical slices.

[0267] Similarly, in the slave station apparatus 12, at least one of the DL slave station processing apparatus 50 and the UL slave station processing apparatus 60 may be configured by logical slices.

[0268] At least one of the master station device 11 and the slave station device 12 may be composed of logical slices.

[0269] <Slave Station Device 12>

[0270] Fig.13 1 is a block diagram showing an example of the structure of the slave station processing device 60 included in the slave station device 12. Fig.14 This is a block diagram showing an example of the configuration of the FH transmitter 70 included in the slave station device 12 .

[0271] (Substation processing device 60)

[0272] like Fig.13 As illustrated, the slave station processing device 60 includes, for example, an RF unit 601 , an A / D (analog to digital) converter 602 , slave station signal processors 603 - 1 and 603 - 2 , and a multiplexer 604 .

[0273] In addition, the substation signal processing units 603-1 and 603-2 are sometimes labeled as substation signal processing units 603#1 and 603#2, respectively. In addition, when the substation signal processing units 603-1 and 603-2 are not distinguished, they are sometimes labeled as substation signal processing units 603. The number of substation signal processing units 603 provided in the substation processing device 60 is not limited to 2, and may be 3 or more. For example, N substation signal processing units 603 corresponding to the number N of service types may be labeled as substation signal processing units 603#j (j=1 to N).

[0274] The slave station signal processing unit 603#1 and the slave station signal processing unit 603#2 may be implemented by physically different devices, or may be implemented by being divided into logical slices, for example.

[0275] The RF unit 601 includes, for example, an antenna, receives a UL wireless signal transmitted from the UE 2 via the antenna, and performs reception RF processing such as down-conversion processing and low-noise amplification processing on the received wireless signal.

[0276] The A / D converter 602 converts the output (analog signal) of the RF unit 601 into a digital signal, for example.

[0277] The slave station signal processing units 603-1 and 603-2 have different functional division structures. For example, the slave station signal processing unit 603-1 is based on the master station signal processing unit 902-1 (refer to Fig.16 ) is a functional division point in the image processing unit, and includes a CP removal (removal) + FFT unit 6031 and a beamforming unit 6032.

[0278] In contrast, the substation signal processing unit 603-2 includes, according to the functional division point in the main station signal processing unit 902-2 corresponding to the service type #2, a CP removal + FFT unit 6031, a beamforming unit 6032, an RE (resource element) demapping unit 6033, a layer demapping unit 6034, a demodulation unit 6035, a descrambling unit 6036, a decoding unit 6037, a MAC unit 6038 and an RLC unit 6039.

[0279] In the slave station signal processing unit 603 - 1 , the CP removal + FFT unit 6031 and the beamforming unit 6032 form, for example, a lower physical layer (Low-PHY) block 6002 .

[0280] The CP removal + FFT unit 6031 of the slave station signal processing unit 603 - 1 performs FFT and CP removal on the output of the A / D conversion unit 602 , for example.

[0281] The beamforming unit 6032 of the slave station signal processing unit 603 - 1 performs reception beamforming processing on the output of the CP removal + FFT unit 6031 , for example.

[0282] On the other hand, in the slave station signal processing unit 603-2, the functional units 6031 to 6039 constitute, for example, a High-PHY block 6001. Also, in the slave station signal processing unit 603-2, the FFT+CP unit 6031 and the beamforming unit 6032 constitute, for example, a Low-PHY block 6002.

[0283] In addition, the Low-PHY block 6002 can use the substation signal processing units 603-1 and 603-2 either alone or in common. In the case of common use, the processing of multiple different substation signal processing units 603 can also be performed in parallel in one Low-PHY block 6002. In addition, control information related to UE transmission for demodulating and decoding user data signals in the wireless base station is sent from the wireless base station 1 to UE2 (not shown in the figure). For example, the wireless base station 1 notifies UE2 of the control information via the PDCCH. Based on the control information received in the PDCCH, UE2 sends a user data signal to the wireless base station 1 via the PUSCH (physical uplink shared channel).

[0284] In the slave station signal processing unit 603 - 2 , the CP removal + FFT unit 6031 performs FFT and CP removal on the output of the A / D conversion unit 602 , and the beamforming unit 6032 performs reception beamforming processing on the output of the CP removal + FFT unit 6031 .

[0285] Furthermore, in the slave station signal processing unit 603 - 2 , the RE demapping unit 6033 demaps the UL signal mapped to the wireless resource (eg, RE).

[0286] The layer demapping unit 6034 demaps, for example, the UL signal mapped by layer in the output of the RE demapping unit 6033. In addition, since the layer demapping unit 6034 is used for MIMO transmission, the layer demapping unit 6034 can be omitted when MIMO transmission is not applied.

[0287] The demodulation unit 6035 demodulates the output of the layer demapping unit 6034 using a demodulation method corresponding to a modulation method such as QPSK, 16QAM, 64QAM, or 256QAM.

[0288] The descrambling unit 6036 performs descrambling processing on the output of the demodulation unit 6035 to remove the scrambling.

[0289] The decoding unit 6037 decodes the output of the descrambling unit 6036, for example.

[0290] The MAC unit 6038 generates an RLC PDU based on the MAC PDU of the UL signal, for example, and outputs it to the RLC unit 6039 .

[0291] The multiplexing unit 604 multiplexes the outputs of the different plurality of slave station signal processing units 603-1 and 603-2, for example, and transmits the multiplexing unit 604 to the FH transmitter 70 (see Fig.14) sends a multiplexed signal. In the multiplexing method in the multiplexing unit 604, as a non-limiting example, TDM, FDM, CDM or WDM can be applied.

[0292] In the multiplexing unit 604, information for identifying the output signal of the substation signal processing unit 603#j (for example, signal ID#j) may also be assigned. For example, the output signals of the substation signal processing unit 603#j may be assigned signal IDs. In addition, for example, in the case of TDM, time slot information is used, in the case of FDM, frequency information is used, in the case of CDM, code information is used, and in the case of WDM, wavelength information is used to respectively play the role of signal ID.

[0293] In addition, the multiplexing unit 604 may be omitted. For example, the outputs of the different plurality of slave station signal processing units 603 # 1 and 603 # 2 may be physically input to the FH transmitter 70 .

[0294] In addition, the slave station signal processing unit 603#1 and the slave station signal processing unit 603#2 may be implemented by physically different devices, or may be implemented by being logically divided in the same device by using virtualization technology, for example.

[0295] In addition, the number of the substation signal processing units 603#j may be greater than 2, and in the case of logical division, may be changed dynamically or appropriately. For example, as described above, when the type of service supported by the wireless base station 1 changes, the number of slices #j corresponding to the substation signal processing unit 603#j may be increased or decreased according to the increase or decrease of the slices #j corresponding to the substation signal processing unit 603#j.

[0296] In addition, Fig.13 One or both of the RF unit 601 and the A / D conversion unit 602 illustrated in the figure may be independently provided for a plurality of different slave station signal processing units 603#j.

[0297] (FH transmitter 70)

[0298] Next, refer to Fig.14 , an example of the structure of the FH transmitter 70 involved in the fourth embodiment is described.

[0299] like Fig.14 As illustrated, the FH transmitter 70 includes, for example, a separation unit 701 , FH transmission processing units 702 - 1 and 702 - 2 , a multiplexing unit 703 , a transmission unit 704 , a control unit 705 , a training data unit 706 , and a transmission unit 707 .

[0300] In addition, the FH transmission processing units 702-1 and 702-2 are sometimes labeled as FH transmission processing units 702#1 and 702#2, respectively. In addition, when the FH transmission processing units 702-1 and 702-2 are not distinguished, they are sometimes labeled as FH transmission processing units 702. The number of FH transmission processing units 702 included in the FH transmitter 70 is not limited to 2, and may be 3 or more. For example, N FH transmission processing units 702 corresponding to the number of service types N may be labeled as FH transmission processing units 702#j (j is j=1 to N).

[0301] FH transmission processing unit 702#1 and FH transmission processing unit 702#2 may be implemented by physically different devices, or may be implemented by software or hardware circuit division within the same device, for example.

[0302] The separation unit 701 separates the multiplexed signal of the UL received from the substation processing device 60 according to the service type #j, for example, based on the aforementioned signal ID, and outputs it to the corresponding FH transmission processing unit 702#j. In addition, the separation unit 701 separates the control information multiplexed with the UL signal received from the FH 13, for example, and outputs it to the control unit 705. The control information may include, for example, information on the MCS used in the MAC unit 6038.

[0303] Furthermore, when the multiplexing unit 604 is omitted in the slave station processing device 60, the separation unit 701 may be omitted. For example, the outputs of the different slave station signal processing units 603#1 and 603#2 may be physically separated and input to the FH transmission processing units 702#1 and 702#2.

[0304] The control unit 705 decodes the control information input from the separation unit 701, and outputs it to the FH transmission processing unit 702 #j.

[0305] The FH transmission processing unit 702#j includes, for example, a coding unit 7021 and a modulation unit 7022.

[0306] The encoding unit 7021 decodes the output of the demodulation unit 4031 based on control information from the control unit 705, for example.

[0307] The modulation unit 7022 modulates the output of the coding unit 7021 based on control information from the control unit 705, for example.

[0308] The multiplexing unit 703, for example, multiplexes the outputs of different FH transmission processing units 702#j and outputs them to the transmission unit 704. The signal multiplexed in the multiplexing unit 703 can also be understood as being equivalent to being sent to different multiple master station signal processing units in the master station processing device 90 (for example, Fig.16The signal of the master station signal processing unit 902#1 and 902#2) described later.

[0309] In addition, in the multiplexing method in the multiplexing unit 703, as a non-limiting example, TDM, FDM, CDM or WDM can be applied. In the multiplexing unit 703, information (for example, signal ID#j) for identifying the output signal of the FH transmission processing unit 702#j can also be given. For example, the output signal of the FH transmission processing unit 702#j can also be given a signal ID. In addition, for example, in the case of TDM, time slot information is used, in the case of FDM, frequency information is used, in the case of CDM, code information is used, and in the case of WDM, wavelength information is used to play the role of the signal ID.

[0310] The transmission unit 704 performs transmission processing corresponding to a wired transmission unit (or a wired interface) such as a UTP cable, an STP cable, or an optical fiber cable on the output of the multiplexing unit 703, and transmits the result to the FH 13.

[0311] The training data unit 706 , similarly to the aforementioned training data unit 406 , generates a known signal (eg, a training signal) for measuring the transmission quality of the FH13 , and outputs the signal to the transmission unit 707 .

[0312] The transmission unit 707 transmits the known signal to the FH 13 connected to the master station device 11 (for example, the FH receiver 80). The known signal transmitted to the FH 13 is received by the reception unit 801 (see Fig.15 )take over.

[0313] Alternatively, the transmission quality of the FH 13 may be measured using a known signal by transmitting a known signal from the FH receiver 80 to the FH transmitter 70 , measuring the transmission quality of the FH 13 in the FH transmitter 70 , and feeding back the measurement result to the FH receiver 80 .

[0314] In addition, the control unit 705, the training data unit 706 and the sending unit 707 can also be respectively connected to Figure 4 The control unit 405, training data unit 406, and transmission unit 407 are commonly used. In other words, the known signal transmission system and the control system of FH transmission quality can also be commonly used in DL and UL.

[0315] In addition, the functions of one or both of the training data unit 706 and the transmitter 707 may be included in the control unit 705. Part or all of the control unit 705, the training data unit 706, and the transmitter 707 may be provided outside the FH transmitter 70 or in the slave station device 12.

[0316] <Master Station Device 11>

[0317] Next, refer to Fig.15 as well as Fig.16 , an example of the structure of the UL of the master station device 11 will be described.

[0318] (FH Receiver 80)

[0319] Fig.15 1 is a block diagram showing an example of the configuration of the FH receiver 80 included in the master station device 11. Fig.15 As illustrated in FIG. 8 , the FH receiver 80 includes, for example, a receiving unit 801 , a separating unit 802 , FH reception processing units 803 - 1 , 803 - 2 , a multiplexing unit 804 , a receiving unit 805 , a measuring unit 806 , and a control unit 807 .

[0320] In addition, the FH reception processing units 803-1 and 803-2 are sometimes labeled as FH reception processing units 803#1 and 803#2, respectively. In addition, when the FH reception processing units 803-1 and 803-2 are not distinguished, they are sometimes labeled as FH reception processing units 803. The number of FH reception processing units 803 included in the FH receiver 80 is not limited to 2, and may be 3 or more. For example, N FH reception processing units 803 corresponding to the number of service types N may also be labeled as FH reception processing units 803#j (j=1 to N).

[0321] The FH reception processing unit 803#1 and the FH reception processing unit 803#2 may be implemented by physically different devices, or may be implemented by software or hardware circuit division within the same device, for example.

[0322] The receiving unit 801 receives the UL signal received from the slave station device 12 via the FH 13 , performs reception processing corresponding to a wired transmission unit (or a wired interface) such as a UTP cable, an STP cable, or an optical fiber cable, and outputs the received signal to the separating unit 802 .

[0323] The separation unit 802 separates the signals corresponding to the different plurality of slave station signal processing units 603#j based on the output of the reception unit 801, for example, based on the aforementioned signal ID, and outputs the signals to the FH reception processing unit 803#j.

[0324] The receiving unit 805 receives a known signal (for example, a training signal) transmitted from the FH transmitter 70 of the slave station device 12 and transmitted in the FH 13 , and outputs the signal to the measuring unit 806 .

[0325] The measuring unit 806 measures the reception quality of the known signal input from the receiving unit 805 , and outputs the quality measurement result to, for example, the control unit 807 .

[0326] Based on the quality measurement results of the measuring unit 806, the control unit 807 determines the FH transmission parameters (for example, one or more of the code type, coding rate, and modulation multi-value number) #j corresponding to the substation signal processing unit 603#j, and outputs them to the FH receiving processing units 803#1 and 803#2.

[0327] In addition, the control unit 807 may encode and modulate the control information sent to the slave station device 12 and send it to the control unit 705 of the FH transmitter 70. The control information may include the determined FH transmission parameters. Additionally or alternatively, the quality measurement result of the measurement unit 806 may also be included in the control information.

[0328] The FH reception processing unit 803#j includes a demodulation unit 8031 ​​and a decoding unit 8032.

[0329] The demodulation unit 8031 ​​demodulates the output of the separation unit 802 based on, for example, control information (for example, FH transmission parameter #j) from the control unit 807 .

[0330] The decoding unit 8032 decodes the output of the demodulation unit 8031 ​​based on, for example, control information (for example, FH transmission parameter #j) from the control unit 807 .

[0331] The multiplexing unit 804, for example, multiplexes the outputs of different FH receiving processing units 803#j and outputs them to the main station processing device 90. The signal multiplexed in the multiplexing unit 804 can also be understood as being equivalent to being sent to different multiple substation signal processing units (for example, Fig.16 The signal of the master station signal processing unit 902#1 and 902#2).

[0332] In addition, in the multiplexing method of the multiplexing unit 804, as a non-limiting example, TDM, FDM, CDM or WDM can be applied. In the multiplexing unit 804, information for identifying the output signal of the FH receiving processing unit 803#j (for example, signal ID#j) can also be given. For example, the output signal of the FH transmitting unit #j can also be given a signal ID. In addition, for example, in the case of TDM, the time slot information is used, in the case of FDM, the frequency information is used, and in the case of WDM, the wavelength information is used to play the role of the signal ID.

[0333] In addition, the multiplexing unit 804 may be omitted. For example, the outputs of the different FH reception processing units 803 # 1 and 803 # 2 may be physically divided and input to the master station processing device 90 .

[0334] In addition, the receiving unit 805, the measuring unit 806 and the control unit 807 can also be respectively Figure 3The illustrated receiving unit 305, measuring unit 306, and control unit 307 are common. In other words, the measurement system using a known signal and the control system of the FH transmission quality can also be common to DL and UL.

[0335] (Master Station Processing Device 90)

[0336] Next, refer to Fig.16 , an example of the structure of the master station processing device 90 is described. Fig.16 As shown, the master station processing device 90 includes, for example, a separation unit 901 , master station signal processing units 902 - 1 and 902 - 2 , a service class multiplexing unit 903 , and an FH quality calculation unit 904 .

[0337] In addition, the master station signal processing units 902-1 and 902-2 are sometimes marked as master station signal processing units 902#1 and 902#2, respectively. In addition, when the master station signal processing units 902-1 and 902-2 are not distinguished, they are sometimes marked as master station signal processing units 902. The number of master station signal processing units 902 included in the master station processing device 90 is not limited to 2, and may be 3 or more. For example, the number of service types may be set to N (N is an integer greater than 2), and N master station signal processing units 902 may be marked as master station signal processing units 902#j (j=1 to N).

[0338] like Fig.16 As shown, the master station signal processing unit 902#1 includes, for example, an RE (resource element) demapping unit 9021, a layer demapping unit 9022, a demodulation unit 9023, a descrambling unit 9024, and a decoding unit 9025. These functional units 9021 to 9024 constitute a High-PHY block 9001.

[0339] In addition, the master station signal processing unit 902 # 1 includes, for example, a MAC unit 9026 , an RLC unit 9027 , a PDCP unit 9028 , and an SDAP unit 9029 .

[0340] The above-described functional units 9021 to 9029 , together with the functional units 6031 and 6032 in the slave station signal processing unit 603 # 1 , are non-limiting examples of a plurality of base station functional units (related to UL) included in the wireless base station 1 .

[0341] The RE demapping unit 9021 demaps the UL signal corresponding to the service type #1 separated in the separation unit 901, for example, from predetermined wireless resources (for example, REs).

[0342] The layer demapping unit 9022 demaps, for example, the UL signal mapped by layer in the output of the RE demapping unit 9021. In addition, since the layer demapping unit 9022 is used for MIMO transmission, the layer demapping unit 9022 may be omitted when MIMO transmission is not applied.

[0343] The demodulation unit 9023 demodulates the output of the layer demapping unit 9022 using a demodulation method corresponding to a modulation method such as QPSK, 16QAM, 64QAM, or 256QAM.

[0344] The descrambling unit 9024 performs descrambling processing on the output of the demodulation unit 9023 to remove the scrambling.

[0345] The decoding unit 9025 decodes the output of the descrambling unit 9024, for example.

[0346] The MAC unit 9026 generates an RLC PDU based on the MAC PDU and outputs a transport block. In addition, the MAC unit 9026 performs, for example, HARQ-based retransmission control, determines the UE2 to allocate UL communication opportunities through scheduling, and determines the MCS in the UL wireless transmission, and sends control information to UE2 via PDCCH (physical downlink control channel).

[0347] Here, the MCS can be determined based on, for example, the CQI fed back from the UE 2 , the communication quality required for each service type, and the FH transmission quality information input from the FH quality calculation unit 904 .

[0348] The RLC unit 9027 performs processing such as error detection and retransmission control based on ARQ on the output of the MAC unit 9026, and outputs a PDCP PDU.

[0349] The PDCP unit 9028 performs processing such as decryption of encrypted user data and header decompression on the output of the RLC unit 9027 , and outputs the SDAP PDU to the SDAP unit 9029 .

[0350] The SDAP unit 9029 performs, for example, mapping of QoS flows and radio bearers, removes the SDAP header from the output of the PDCP unit 9028, and transmits the result to an upper core network.

[0351] The FH quality calculation unit (or FH quality determination unit) 904 determines FH transmission quality information based on information on the FH transmission quality measured in the measurement unit 806 of the FH receiver 80 and fed back to the master station processing device 90 .

[0352] The FH transmission quality information is input to, for example, the MAC unit 9026 in at least one master station signal processing unit 902#1. Additionally, the FH transmission quality information may be input to the MAC unit 9026 in another master station signal processing unit 902#j (for example, j=2) different from the master station signal processing unit 902#1.

[0353] The MAC unit 9026 calculates the transmission quality of the UL transmission path that combines the FH transmission path and the wireless transmission path, for example, based on the wireless quality information indicated by the CQI fed back from the UE2 and the FH transmission quality information. Then, the MAC unit 9026 determines, for example, the MCS so that the transmission quality of the combined transmission path when transmitting data satisfies the required quality corresponding to the service type.

[0354] As a non-limiting example, the MAC unit 9026 combines the SN ratio of the UL wireless transmission section and the SN ratio of the UL FH transmission section. The MAC unit 9026 determines an MCS suitable for the UL combined transmission path including the wireless transmission section and the FH transmission section based on the combined SN ratio.

[0355] In the fourth embodiment, when the quality degradation of FH transmission is allowed, in determining the MCS (in other words, controlling the radio transmission method), an MCS that can compensate for the signal quality degradation allowed for FH transmission may be selected.

[0356] Then, the MAC unit 9026 outputs control information such as information on the determined MCS or information on resources (eg, resource elements (RE)) or layers used for UL wireless transmission to the High-PHY block 9001 .

[0357] On the other hand, Fig.16 As illustrated, the master station signal processing unit 902#2 includes, for example, a PDCP unit 9028 and an SDAP unit 9029. The functions of the PDCP unit 9028 and the SDAP unit 9029 are the same or similar to those of the master station signal processing unit 902#1.

[0358] In other words, the RE demapping unit 9021, the layer demapping unit 9022, the demodulation unit 9023, the descrambling unit 9024, the decoding unit 9025, the MAC unit 9026, and the RLC unit 9027 are not configured in the master station signal processing unit 902#2. Fig.13 As illustrated, the functional units corresponding to the functional units 9021 to 9027 are arranged in the slave station processing device 60 (slave station signal processing unit 603 # 2 ).

[0359] Therefore, regarding UL, the functional division structure of master station signal processing section 902#2 is different from that of master station signal processing section 902#1. In other words, regarding UL, the functional division points related to the base station function are different in master station signal processing section 902#1 and master station signal processing section 902#2.

[0360] Then, in Fig.16 In the example, the service type multiplexing unit 903 multiplexes the UL signals of each service type as outputs of the master station signal processing units 902#1 and 902#2, and transmits the multiplexed signals to the upper core network (e.g., EPC or 5GC). In addition, the configuration position of the service type multiplexing unit 903 is not limited to Fig.16 For example, it may be arranged in the front stage of the PDCP unit 9028 or the front stage of the SDAP unit 9029 described later.

[0361] In addition, you can also Fig.15 In the illustrated FH receiver 80, the separation unit 901 is omitted when the multiplexing unit 804 is omitted. For example, the outputs of the different FH reception processing units 803-1 and 803-2 may be physically separated and input to the master station signal processing units 902-1 and 902-2, respectively.

[0362] Furthermore, the master station signal processing unit 902 - 1 and the master station signal processing unit 902 - 2 may be implemented by physically different devices, or may be implemented by logically dividing slices in the same device using virtualization technology, for example.

[0363] In addition, the number of UL master station signal processing units 902 may be more than two as described above, and in the case of logical division, it may be changed dynamically or appropriately. For example, when the type of service supported by the wireless base station 1 changes, by increasing or decreasing the number of slices according to the change, a structure suitable for the service type can be achieved.

[0364] For example, in the wireless base station 1, slices suitable for the service type supported in the UL, such as slices for eMBB, slices for URLLC, or slices for mMTC, can be added or deleted as needed. Therefore, the base station structure of the UL suitable for the service type can be flexibly implemented.

[0365] In addition, regarding UL, at least one of the master station processing device 90 and the slave station processing device 60 may be composed of logical slices.

[0366] (Action Example)

[0367] Focusing on the UL operation example of the fourth embodiment, for example, the operation is equivalent to the following: Figure 6In the illustrated timing diagram, the flow of "user data" is in the opposite direction, and the main station processing device 20, FH transmitter 30, FH receiver 40 and substation processing device 50 are replaced by the main station processing device 90, FH receiver 80, FH transmitter 70 and substation processing device 60 respectively.

[0368] As described above, according to the fourth embodiment, the same effects as those of the first embodiment can be obtained with respect to UL.

[0369] In addition, the measuring unit 806 of the FH receiver 80 may also include the FH quality calculating unit 904 of the master station processing device 90 (see Fig.16 In this case, the master station processing device 90 may not include the FH quality calculation unit 904.

[0370] In addition, the FH quality calculation unit 904 of the master station processing device 90 and the control unit 807 of the FH receiver 80 may be integrally configured as one control unit. For example, the function of one of the FH quality calculation unit 904 and the control unit 807 may be included in the other of the FH quality calculation unit 904 and the control unit 807. In addition, the measurement unit 806 of the FH receiver 80 may also be included in the control unit 807.

[0371] In other words, the functions of the FH quality calculation unit 904 , the measurement unit 806 , and the control unit 807 may be provided in the master station device 11 .

[0372] (Implementation method 5)

[0373] The UL structure corresponding to the second embodiment is equivalent to Fig.16 In the illustrated master station processing device 90, the FH quality calculation unit 904 is replaced by the Figure 7 The target quality setting unit 205 shown in the example has the same functional unit structure. Fig.15 In the illustrated FH receiver 80 , the measuring unit 806 may not feed back the FH transmission quality information, which is the measurement result of the known signal, to the FH quality calculation unit 904 .

[0374] In the fifth embodiment, the UL structures of the substation processing device 60 and the FH transmitter 70 in the substation device 12 may also be respectively Fig.13 as well as Fig.14 The structures illustrated in are the same or identical.

[0375] In the fifth embodiment, the operation example focusing on UL is equivalent to the following operation: Fig. 9In the illustrated timing diagram, the flow direction of "user data" is in the reverse direction, and the main station processing device 20, FH transmitter 30, FH receiver 40 and substation processing device 50 are replaced by the main station processing device 90, FH receiver 80, FH transmitter 70 and substation processing device 60 respectively.

[0376] According to the fifth embodiment, the same effects as those of the second embodiment can be obtained with respect to UL.

[0377] (Implementation 6)

[0378] The UL structure corresponding to the third embodiment is equivalent to Fig.15 The FH receiver 80 of the master station device 11 shown in the example has the same function as that of the third embodiment. Fig.10 The Ack / Nack calculation unit 408 and the transmission unit 407 shown in the example have the same functional unit configuration.

[0379] In the sixth embodiment, the UL structures of the master station processing device 90 of the master station device 11, the slave station processing device 60 of the slave station device 12, and the FH transmitter 70 may be respectively Fig.16 , Fig.13 as well as Fig.14 The structures illustrated are the same or identical.

[0380] In the sixth embodiment, for example, Ack / Nack statistical information about the UL signal is obtained in the FH receiver 80. The Ack / Nack statistical information is sent to the control unit 807 of the FH receiver 80 and the FH quality calculation unit 904 of the master station processing device 90. Thus, based on the Ack / Nack statistical information, the transmission parameters of the UL wireless section and the FH transmission section are controlled.

[0381] According to the sixth embodiment, the same effects as those of the third embodiment can be obtained with respect to UL.

[0382] (other)

[0383] In the above-mentioned first to sixth embodiments, the description is made with attention paid to the one-to-one connection relationship between the master station device 11 and the slave station device 12 , but the connection relationship between the master station device 11 and the slave station device 12 may be a one-to-many relationship.

[0384] In the case where signals of different service types are multiplexed in the FH transmitter 30 (or 70) and the FH receiver 40 (or 80), the pattern of the known signal for measuring the FH transmission quality may also be prepared in the amount of the multiplexing number (the number of service types). In this case, it is expected that the accuracy of the FH transmission quality measurement for each service type is improved.

[0385] When the notation "...part" used in the above-mentioned embodiments 1 to 6 refers to a physical element, it can also be replaced by other notations such as "...circuitry", "...device", "...unit" or "...module". On the other hand, in the case of representing a logical element, the notation "...part" can also be replaced by, for example, "slice" as described above.

[0386] The term “functional division point” used in the above-mentioned first to sixth embodiments may be referred to as “split”, “option” or “split option”.

[0387] For example, Common Public Radio Interface: eCPRI Interface Specification V2.0 (2019-05-10) specifies branches A to E. In addition, as an example of a "segmentation option", for example, as described in ITU-TG-series Recommendations-Supplement 66 (2018-10), the following segmentation options 1 to 8 are listed.

[0388] (1) Split option 1: Between RRC (radio resource control) and PDCP

[0389] (2) Split Option 2: Between PDCP and RLC (High-RLC)

[0390] (3) Split option 3: Between High-RLC and Low-RLC

[0391] (4) Split option 4: Between RLC (Low-RLC) and MAC (High-MAC)

[0392] (5) Split option 5: Between High-MAC and Low-MAC

[0393] (6) Split Option 6: Between MAC (Low-MAC) and PHY (High-PHY)

[0394] (7) Split Option 7: Between High-PHY and Low-PHY

[0395] (8) Split Option 8: Between PHY (Low-PHY) and RF

[0396] Furthermore, as shown in the above-mentioned division options 1 to 8, in the first to sixth embodiments, the RLC unit and the MAC unit may be functionally divided (or classified) into a high level (High) and a low level (Low), respectively.

[0397] The functional division structure of the master station signal processing unit 202#1 and the slave station signal processing unit 502#1 related to DL and the functional division structure of the master station signal processing unit 902#1 and the slave station signal processing unit 603#1 related to UL illustrated in Embodiments 1 to 6 correspond to "branch D" or "division option 7".

[0398] In contrast, the functional division structure of the master station signal processing unit 202#2 and the slave station signal processing unit 502#2 related to DL, and the functional division structure of the master station signal processing unit 902#2 and the slave station signal processing unit 603#2 related to UL illustrated in embodiments 1 to 6 are equivalent to "fork B" or "division option 2".

[0399] The functional division structure of the main station signal processing unit (202 / 902) #j and the substation signal processing unit (502 / 603) #j may adopt any fork (or division option) if it is a combination of different forks (or division options) among forks A to E (or division options 1 to 8).

[0400] Furthermore, any of branches A to E (or division options 1 to 8) may be further divided (or classified) as a "sub-branch" (or "sub-option"), for example. The "sub-branch" (or "sub-option") may also be included in the combination candidates of different functional division structures.

[0401] In Embodiments 1 to 6, the case where there is one functional division point (the functional division structure is two of the master station device 11 and the slave station device 12) is described, but the functional division point may be two or more. For example, a plurality of base station functional units may be divided and configured into three of CU, DU and RU (radio unit) through two functional division points.

[0402] In this case, for example, the connection between the CU and the DU is equivalent to FH13. For example, based on the information indicating the transmission quality of FH13 between the CU and the DU, the transmission quality (for example, transmission parameters) between the CU-DU and between the DU-RU may be controlled separately so that the transmission quality of the combined transmission path of the CU-DU-RU meets the required quality.

[0403] The present disclosure can be implemented by software, hardware or software in cooperation with hardware. Each functional block used in the description of the above embodiment is partially or completely implemented as an LSI of an integrated circuit, and each processor described in the above embodiment can also be partially or completely controlled by an LSI or a combination of LSIs. LSI can be composed of individual chips or a chip including part or all of the functional blocks. LSI can also have data input and output. LSI is sometimes referred to as IC, system LSI, super LSI, and large-scale LSI depending on the degree of integration.

[0404] In addition, the method of integrated circuitization is not limited to LSI, and can also be implemented by a dedicated circuit, a general-purpose processor or a dedicated processor. In addition, after LSI is manufactured, a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor that can reconfigure the connection or setting of the circuit unit inside the LSI can also be used. The present disclosure can be implemented as digital processing or analog processing.

[0405] Furthermore, if there is an integrated circuit technology that replaces LSI through the progress of semiconductor technology or other derived technologies, it is of course possible to use this technology to integrate functional blocks. Biotechnology, etc. may be applied.

[0406] <Summary of the present disclosure>

[0407] A main station device involved in a non-limiting embodiment of the present disclosure is connected to a substation device via a fronthaul, and comprises: a first base station signal processing unit, which has a first functional division structure related to a plurality of base station functional units for a first service type; and a second base station signal processing unit, which has a second functional division structure related to the plurality of base station functional units for a second service type.

[0408] Here, the master station device involved in a non-limiting embodiment of the present disclosure may also include a control unit, which determines the transmission method of the fronthaul in the first base station signal processing unit and the second base station signal processing unit respectively.

[0409] In addition, in a non-limiting embodiment of the present disclosure, the control unit may determine the transmission method of the fronthaul and the wireless transmission method based on the slave station device based on information indicating the transmission quality of the fronthaul.

[0410] In a non-limiting embodiment of the present disclosure, the information indicating the transmission quality of the fronthaul may be based on a result of quality measurement of a known signal transmitted in the fronthaul between the master station device and the slave station device.

[0411] In a non-limiting embodiment of the present disclosure, the known signal may be sent from the slave station device to the master station device via the fronthaul, and a measuring unit for measuring the quality of the known signal may be provided in the master station device.

[0412] In a non-limiting embodiment of the present disclosure, the known signal may be sent from the master station device to the substation device via the fronthaul, and the information indicating the transmission quality of the fronthaul may be feedback information of the result of the substation device measuring the quality of the known signal.

[0413] In a non-limiting embodiment of the present disclosure, the information indicating the transmission quality of the fronthaul may be based on an error determination result of the data transmitted in the fronthaul.

[0414] In a non-limiting embodiment of the present disclosure, the control unit may determine the transmission method of the fronthaul and the wireless transmission method based on the slave station device based on information related to a designated target quality.

[0415] A substation device involved in a non-limiting embodiment of the present disclosure is connected to a main station device via a fronthaul, and comprises: a first base station signal processing unit, which has a first functional division structure related to multiple base station functional units for a first service type; and a second base station signal processing unit, which has a second functional division structure related to the multiple base station functional units for a second service type.

[0416] The slave station device according to a non-limiting embodiment of the present disclosure may include a transmission unit that transmits a signal known between the master station device and the slave station device to the master station device.

[0417] In a non-limiting embodiment of the present disclosure, the slave station may also feed back to the master station a quality measurement result in the slave station of a signal sent by the master station and known between the master station and the slave station.

[0418] In a communication control method of a non-limiting embodiment of the present disclosure, a main station device connected to a substation device through a fronthaul obtains information indicating the transmission quality of the fronthaul; and based on the information indicating the transmission quality of the fronthaul, a transmission mode of the fronthaul is determined in a first base station signal processing unit and a second base station signal processing unit, respectively, wherein the first base station signal processing unit has a first functional division structure related to a plurality of base station functional units for a first service type, and the second base station signal processing unit has a second functional division structure related to the plurality of base station functional units for a second service type.

[0419] In a communication control method involved in a non-limiting embodiment of the present disclosure, a substation device connected to a main station device through a fronthaul sends a signal for the main station device to measure the transmission quality of the fronthaul; and based on information representing the transmission quality of the fronthaul, the transmission mode of the fronthaul is determined in a first base station signal processing unit and a second base station signal processing unit, respectively, wherein the first base station signal processing unit has a first functional division structure related to multiple base station functional units for a first service type, and the second base station signal processing unit has a second functional division structure related to the multiple base station functional units for a second service type.

[0420] The present disclosure is applicable to, for example, a base station for wireless communication.

Claims

1. A master station device connected to a slave station device via a fronthaul, the master station device comprising: A first base station signal processing unit, for a first service type, having a first functional division structure associated with a plurality of base station functional units; a second base station signal processing unit having a second functional division structure related to the plurality of base station functional units for a second service type; and The control unit determines the transmission mode of the fronthaul for the first base station signal processing unit and the second base station signal processing unit respectively. The control unit performs the following control: when the first functional division structure includes an upper physical layer and the second functional division structure does not include an upper physical layer, for the transmission method of the first base station signal processing unit in the forward transmission to the substation device, a forward transmission with lower redundancy than the transmission method of the second base station signal processing unit is applied.

2. The master station device according to claim 1, wherein: The control unit determines the transmission method of the fronthaul and the wireless transmission method of the slave station device based on the information indicating the transmission quality of the fronthaul.

3. The master station device according to claim 2, wherein: The information indicating the transmission quality of the fronthaul is based on a result of quality measurement of a known signal transmitted in the fronthaul between the master station device and the slave station device.

4. The master station device according to claim 3, wherein: The known signal is sent from the slave station device to the master station device via the fronthaul, The master station device is provided with a measuring unit for measuring the quality of the known signal.

5. The master station device according to claim 3, wherein: The known signal is transmitted from the master station device to the slave station device via the fronthaul, and the information indicating the transmission quality of the fronthaul is feedback information of the result of the slave station device measuring the quality of the known signal.

6. The master station device according to claim 2, wherein: The information indicating the transmission quality of the fronthaul is based on an error determination result of the data transmitted in the fronthaul.

7. The master station device according to claim 1, wherein: The control unit determines a transmission method of the fronthaul and a wireless transmission method of the slave station device based on information related to a designated target quality.

8. A substation device connected to a main station device via a fronthaul, the substation device comprising: A first base station signal processing unit having a first functional division structure associated with a plurality of base station functional units for a first service type; and The second base station signal processing unit has a second functional division structure related to the plurality of base station functional units for a second service type, The first base station signal processing unit and the second base station signal processing unit are respectively determined to use the transmission mode of the fronthaul. When the first functional division structure includes an upper physical layer and the second functional division structure does not include an upper physical layer, a transmission method of the first base station signal processing unit in a forward transmission to the substation device is applied with a forward transmission having a lower redundancy than the transmission method of the second base station signal processing unit.

9. The slave station device according to claim 8, comprising: The transmitting unit transmits a signal known between the master station device and the slave station device to the master station device.

10. The substation device according to claim 8, wherein: The slave station device feeds back to the master station device a quality measurement result in the slave station device of a signal transmitted by the master station device and known between the master station device and the slave station device.

11. A communication control method, comprising: The master station device is connected to the slave station device through the fronthaul obtaining information indicating a transmission quality of the fronthaul; as well as Based on the information indicating the transmission quality of the fronthaul, the first base station signal processing unit and the second base station signal processing unit respectively determine the transmission mode of the fronthaul, The first base station signal processing unit has a first functional division structure related to a plurality of base station functional units for a first service type, and the second base station signal processing unit has a second functional division structure related to the plurality of base station functional units for a second service type, When the first functional division structure includes an upper physical layer and the second functional division structure does not include an upper physical layer, for the transmission method of the first base station signal processing unit in the forward transmission to the substation device, a forward transmission with lower redundancy than the transmission method of the second base station signal processing unit is applied.

12. A communication control method, comprising: The slave station device is connected to the master station device through the fronthaul Sending a signal for the master station device to measure the transmission quality of the fronthaul; as well as Based on the information indicating the transmission quality of the fronthaul, the first base station signal processing unit and the second base station signal processing unit respectively determine the transmission mode of the fronthaul, The first base station signal processing unit has a first functional division structure related to a plurality of base station functional units for a first service type, and the second base station signal processing unit has a second functional division structure related to the plurality of base station functional units for a second service type, When the first functional division structure includes an upper physical layer and the second functional division structure does not include an upper physical layer, for the transmission method of the first base station signal processing unit in the forward transmission to the substation device, a forward transmission with lower redundancy than the transmission method of the second base station signal processing unit is applied.

Images