Master station device, base station, and communication control method

Abstract

The base station (1) determines the forward transmission resources and transmission mode allocated to the terminal (2) based on the forward transmission quality information and the channel quality information of the terminal (2) (S607); based on the determined information, controls the transmission mode of the signal sent to the forward transmission through the determined resources (S608, S609).

Description

Technical Field

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

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

[0003] For example, a master station connected to a core network has baseband signal processing functionality of a wireless base station, and one or more slave stations are connected to the master station. The slave stations perform wireless processing such as analog-to-analog conversion and communicate wirelessly with UEs. Summary of the Invention

[0004] However, in existing wireless communication systems (eg, wireless base stations), there is room for research on the transmission efficiency between a master station device and slave stations (forward transmission).

[0005] Non-limiting embodiments of the present disclosure help provide a master station device, a base station, and a communication control method that can improve the transmission efficiency of fronthaul.

[0006] A master station device involved in one embodiment of the present invention comprises: a control unit, which determines the resources and transmission method of the fronthaul allocated to the terminal based on the transmission quality information of the fronthaul and the channel quality information of the terminal; and a transmitter, which controls the transmission method of the signal sent to the fronthaul through the resources based on the determined information.

[0007] In addition, these general or specific methods can be implemented through systems, devices, methods, integrated circuits, computer programs, or recording media, or through any combination of systems, devices, methods, integrated circuits, computer programs, and recording media.

[0008] According to one embodiment of the present disclosure, the transmission efficiency of the fronthaul can be improved.

[0009] Further advantages and effects of one embodiment of the present disclosure will become apparent from the description and accompanying drawings. The above advantages and / or effects are provided by some embodiments and the features described in the description and accompanying drawings, but it is not necessary to provide all of them in order to obtain one or more of the same features. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a diagram showing an example of the configuration of a wireless communication system according to Embodiment 1.

[0011] Figure 2 It shows Figure 1 A diagram showing an example of the configuration of a master station processing unit in the illustrated master station device.

[0012] Figure 3 It shows Figure 1 A diagram showing an example of the configuration of an FH transmitter in the illustrated master station device.

[0013] Figure 4 It shows Figure 1 A diagram showing an example of the configuration of an FH receiver in an exemplified slave device.

[0014] Figure 5 It shows Figure 1 A diagram showing an example of the configuration of a slave processing unit in the illustrated slave device.

[0015] Figure 6 This is a sequence diagram showing an operation example according to the first embodiment.

[0016] Figure 7 This is a diagram showing an example of threshold value setting according to the first embodiment.

[0017] Figure 8A This is a diagram showing an example of allocation of FH resources (time intervals) according to the first embodiment.

[0018] Figure 8B This is a diagram showing another example of allocation of FH resources (time intervals) according to the first embodiment.

[0019] Figure 9 This is a diagram showing an example of allocation of FH resources (frequency intervals) according to the second embodiment.

[0020] Figure 10 This is a diagram showing an example of the configuration of a master station processing unit in a master station device according to the second embodiment.

[0021] Figure 11 This is a diagram showing an example of the configuration of an FH transmitter in a master station device according to the second embodiment.

[0022] Figure 12 This is a diagram showing an example of the configuration of an FH receiver in a slave station device according to the second embodiment.

[0023] Figure 13 This is a diagram showing an example of the configuration of a wireless communication system according to Embodiment 3.

[0024] Figure 14 It shows Figure 13 A diagram showing an example of the configuration of a slave processing unit in the illustrated slave device.

[0025] Figure 15 It shows Figure 13 A diagram showing an example of the configuration of an FH transmitter in an exemplified slave device.

[0026] Figure 16 It shows Figure 13 A diagram showing an example of the configuration of an FH receiver in the illustrated master station device.

[0027] Figure 17 It shows Figure 13 A diagram showing an example of the configuration of a master station processing unit in the illustrated master station device.

[0028] Description of the label

[0029] 1 Wireless Base Station

[0030] 2 UE

[0031] 11 Master Station Device

[0032] 12 slave devices

[0033] 13 FH

[0034] 20,20A,90 Main Station Processing Unit

[0035] 30,30A,70 FH transmitter

[0036] 40,40A,80 FH receiver

[0037] 50,60 Slave processing unit

[0038] 205,205-1,205-2,501,603,901 Physical Channel Processing Unit

[0039] 301,403,702,802 FH Control Information Analysis Department

[0040] 302,302-1,302-2,703 FH Transmission Processing Unit

[0041] 306,806 Measurement Department

[0042] 404,404-1,404-2,803 FH Receiving and Processing Department

[0043] 405,705 Training Signal Generation Unit

[0044] 2041,9021 Threshold setting unit

[0045] 2042,9022 UE Classification Department

[0046] 2043,9023 Dispatching Department. DETAILED DESCRIPTION

[0047] The following describes the embodiments with reference to the accompanying drawings as appropriate. In addition, overly detailed descriptions may be omitted. For example, detailed descriptions of well-known matters or repeated descriptions of substantially identical structures may be omitted. This is to avoid excessive length in the following description and to facilitate understanding by those skilled in the art.

[0048] In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0049] <Knowledge that Completed This Disclosure>

[0050] In conventional technology (e.g., Japanese Patent Application Laid-Open No. 2018-170805), a master station device is sometimes referred to as a BBU (baseband unit), and a slave station device is sometimes referred to as an RRH (remote radio head). The connection between the master station device and the slave station device utilizes a wired transmission unit (or wired interface) such as a coaxial cable, UTP (unshielded twisted pair) cable, STP (shielded twisted pair) cable, or optical fiber cable. This connection between the master station device and the slave station device is sometimes referred to as a "front haul connection" or simply "front haul."

[0051] In regulations related to fronthaul (FH) communication methods (for example, Common Public Radio Interface (CPRI) Interface Specification V7.0 (2015-10-09)), the master station device is called REC (radio equipment controller) and the slave station device is called RE (radio equipment).

[0052] Here, as wireless communication becomes faster and more capacitive, the amount of FH communication (for example, data traffic) also increases, which puts a strain on the FH communication bandwidth.

[0053] As an example of a countermeasure to FH bandwidth shortages, research is underway to reduce FH traffic by changing from a traditional structure to one that splits (or separates) multiple base station functions into a master station and slave stations (e.g., Japanese Patent Application Publication No. 2018-170805). The boundary where multiple base station functions are split between the master station and slave stations is sometimes referred to as a "functional split point." A "functional split structure" may also be referred to as a "functional split architecture."

[0054] Similarly, in the Common Public Radio Interface: eCPRI Interface Specification V2.0 (2019-05-10), changes to the functional division between the master and slave devices are under consideration.

[0055] Furthermore, research is underway to alter user allocation and resource allocation for wireless communications based on the availability of the FH band (e.g., Japanese Patent Application Publication No. 2016-111637). For example, by preparing patterns related to user allocation and resource allocation for wireless communications and applying patterns that fall within the FH band, it is possible to avoid FH band shortages.

[0056] However, as described in the Common Public Radio Interface (CPRI) Interface Specification V7.0 (October 9, 2015), even if the functional division between master and slave devices is changed, if overall traffic volume increases, the FH band will become scarce. Furthermore, as described in Japanese Patent Application Laid-Open No. 2016-111637, applying a mode that falls within the FH band imposes restrictions on the FH band. Therefore, even if data exceeding the FH band can be prevented from being transmitted on the FH, it will not increase FH transmission traffic.

[0057] Meanwhile, research is underway to reduce the redundancy of FH transmission (for example, the amount of code used for error detection such as parity bits) by allowing residual distortion of the signal transmitted via FH transmission (hereinafter sometimes referred to as "residual signal distortion").

[0058] For example, residual signal distortion in FH transmission is compensated by controlling the MCS (Modulation and Coding Scheme) in the wireless section. This compensation control improves the tolerance (or robustness) to residual signal distortion in FH transmission, for example, for terminals using lower MCSs. Hereinafter, tolerance to residual signal distortion in FH transmission will sometimes be referred to as "FH residual distortion tolerance."

[0059] A base station can multiplex multiple terminals (in other words, users) to transmit data signals simultaneously. For example, the base station multiplexes multiple terminals by allocating different resource blocks (RBs) to each of the communicating terminals.

[0060] Here, a case where terminals to which a high MCS is applied (hereinafter sometimes simply referred to as "high MCS terminals") and terminals to which a low MCS is applied (hereinafter sometimes simply referred to as "low MCS terminals") are multiplexed will be studied.

[0061] When the FH transmission quality is designed to suit a high MCS terminal, for example, the FH residual distortion tolerance of a low MCS terminal is higher than that of a high MCS terminal, which results in excessive redundancy in the FH transmission.

[0062] Conversely, when FH transmission quality is designed for low-MCS terminals, high-MCS terminals have lower FH residual distortion tolerance than low-MCS terminals. Consequently, signal quality within the wireless section of high-MCS terminals cannot be guaranteed. This lack of signal quality leads to signal retransmissions between the terminal and the wireless base station.

[0063] Therefore, regardless of whether the FH transmission quality is designed for a high MCS terminal or a low MCS terminal, the FH transmission efficiency will be low.

[0064] <Overview of the present disclosure>

[0065] Based on the above knowledge, this disclosure describes a technique for improving the transmission efficiency of FH. For example, the following techniques (1) to (4) will be described.

[0066] (1) Within the area covered by a base station (also called a cell), it is assumed that high-MCS terminals and low-MCS terminals can coexist. A high-MCS terminal is an example of a terminal whose wireless communication quality (in other words, signal quality) with the base station is relatively high compared to other terminals in the cell (a high-signal-quality terminal). In contrast, a low-MCS terminal is an example of a terminal whose wireless signal quality with the base station is relatively low compared to other terminals in the cell (a low-signal-quality terminal). The difference in signal quality can vary depending on the wireless propagation environment (or propagation conditions), such as the distance between the terminal and the base station and the presence or absence of obstructions.

[0067] (2) Resources that can be used for FH transmission (hereinafter sometimes referred to as "FH resources") are divided into multiple different intervals. "Interval" can also be, for example, an interval on at least one of the time axis and the frequency axis. The number of intervals divided for FH transmission (n) can also be 2 or more. Each of the two or more divided intervals can also be represented as interval #j (j is any one of 1 to n). As a non-limiting example, the number of divided intervals n = 2 (j = 1 or 2) is assumed below.

[0068] (3) Scheduling (in other words, controlling the allocation of FH resources) is performed to allocate (or multiplex) low MCS terminals to the first interval #1 and to allocate (or multiplex) high MCS terminals to the second interval #2. The classification (or differentiation or identification) of low MCS terminals and high MCS terminals can also be performed based on, for example, a threshold value (or a range defined by two threshold values) based on FH transmission quality. As a non-limiting example, the threshold value can be a predetermined value. Furthermore, there can be three or more threshold values.

[0069] (4) Different FH transmission methods may be applied to interval #1 and interval #2. The FH transmission method may be determined based on at least one of the transmission parameters, such as the type of error correction code (hereinafter sometimes referred to as "code type"), the coding rate, the modulation multi-value number, and the multiplexed optical wavelength. The code type is an example of information indicating the type of code, such as Reed-Solomon code, low-density parity-check (LDPC) code, or polar code. The "code type" is not limited to block codes, but may also include convolutional codes such as turbo codes.

[0070] (About interval)

[0071] In (2) above, the unit of the interval on the time axis of FH transmission (i.e., time interval) may also be a unit corresponding to the time interval of the radio resource (or time resource), such as a mini-slot (or sub-slot), a time slot, a sub-frame, or a radio frame. A "time slot" may also be composed of, for example, multiple "mini-slots."

[0072] A "subframe" can also be composed of, for example, one or more "time slots." A "radio frame" can also be composed of, for example, multiple "subframes." These time interval units can also be referred to by other names. For example, a time interval can also be called a TTI (Transmission Time Interval).

[0073] On the other hand, the unit of the interval on the frequency axis (ie, frequency band) of FH transmission may be a unit corresponding to the frequency interval of radio resources (or frequency resources), such as RB or BWP (bandwidth part).

[0074] One or more RBs can be replaced by terms such as physical resource block (PRB), subcarrier group, resource element group (REG), PRB pair, and RB pair. An RB can also be composed of one or more resource elements (RE). For example, an RE can also be composed of one subcarrier and one symbol. These frequency interval units can also be referred to by other names.

[0075] The units of "intervals" on the time or frequency axis (in other words, FH resources) in FH transmission may differ from the units of resources (radio resources) in wireless transmission described above. However, by aligning the units, the signal processing of FH transmission signals can be simplified. For example, the units of FH resources may be aligned with the units used for scheduling related to radio resources. Furthermore, the signal processing of FH transmission signals may include, for example, encoding and modulation on the FH transmitting side, and demodulation and decoding on the FH receiving side.

[0076] (Implementation Method 1)

[0077] Figure 1 FIG. 1 is a diagram showing an example of a structure of a wireless communication system according to the first embodiment. 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. The number of wireless base stations 1 and UE 2 may be two or more.

[0078] UE 2 communicates with wireless base station 1 via a wireless connection. Wireless communication between UE 2 and wireless base station 1 includes at least one of uplink (UL) communication and downlink (DL) communication. The following describes an example focusing on the DL structure and operation of wireless base station 1. Examples focusing on the UL will be described later in Embodiments 3 and 4.

[0079] The wireless base station 1 includes a master station device 11 and a slave station device 12, which are interconnected via, for example, an FH 13. The master station device 11 may also be referred to as, for example, a BBU, a CBBU (centralized baseband unit), an REC, or a CU (central unit). The slave station device 12 may also be referred to as, for example, an RRH, a RE, or a DU (distributed unit). Furthermore, one master station device 11 can be connected to two or more slave station devices 12. Furthermore, one slave station device 12 can be connected to two or more UEs 2.

[0080] For example, a wired transmission unit (or wired interface) such as a UTP cable, an STP cable, or a fiber optic cable can also be used in the FH 13. The wired interface can also be an interface compliant with 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). "Ethernet" is a registered trademark.

[0081] <Master Station Device 11>

[0082] like Figure 1 As illustrated, the master station device 11 includes, for example, a master station processing unit 20 and an FH transmitter 30 . Figure 2 An example of the structure of the master processing unit 20 is shown. Figure 3 An example of the configuration of the FH transmitter 30 is shown.

[0083] (Master Station Processing Unit 20)

[0084] like Figure 2As illustrated, the master station processing unit 20 includes, for example, an SDAP (Service Data Adaptation Protocol) unit 201, a PDCP (Packet Data Convergence Protocol) unit 202, an RLC (Radio Link Control) unit 203, a MAC (Medium Access Control) unit 204, and a physical channel processing unit 205.

[0085] For example, signals (e.g., user data) sent from a higher-level core network (e.g., EPC or 5GC) are input into SDAP unit 201. "EPC" is an abbreviation for "evolved packet core," and 5GC is an abbreviation for "5th generation (5G) core network." 5G stands for fifth-generation radio access technology (RAT) and is sometimes referred to as NR (new radio). 5GC is also sometimes referred to as NGC (next generation core network).

[0086] The SDAP unit 201 performs, for example, mapping of QoS (Quality of Service) flows and radio bearers, adds an SDAP header to a signal (eg, packet) transmitted from an upper core network, and outputs the signal to the PDCP unit 202 .

[0087] The PDCP unit 202 performs processing such as encryption and header compression on the output of the SDAP unit 201 , and outputs a PDCP PDU (Protocol Data Unit) to the RLC unit 203 .

[0088] The RLC unit 203 performs processing such as error detection and retransmission control based on ARQ (Automatic Repeat Request) on the output of the PDCP unit 202, and outputs an RLC PDU.

[0089] The MAC unit 204 performs retransmission control based on, for example, HARQ (hybrid automatic repeat request), determines UE 2 for communication opportunity allocation through scheduling, and determines the MCS for wireless transmission. It generates a MAC PDU from the RLC PDU and outputs a transport block. The MCS can also be determined using channel quality information (e.g., CQI (channel quality indicator)) fed back from UE 2.

[0090] Thus, since CQI and MCS are correlated (or associated), CQI can also be replaced by MCS (or MCS index). In addition, since CQI is an example of a reception quality indicator in UE 2, it can also be replaced by a quality indicator different from CQI, such as RSSI (received signal strength indicator) or SNR (signal-to-noise ratio).

[0091] The MAC unit 204 may include, for example, a threshold setting unit 2041 , a UE classification unit 2042 , and a scheduling unit 2043 .

[0092] FH quality information from the FH transmitter 30 may also be input to the threshold setting unit 2041. The FH quality information is an example of an indicator of the transmission quality of the FH transmission section. As a non-limiting example, SNR may also be used for the FH quality information.

[0093] For example, the threshold setting unit 2041 determines the threshold (or threshold range) for switching the FH transmission mode based on the FH quality information, and outputs information indicating the determined threshold (or threshold range) (hereinafter sometimes referred to as "threshold information") to the UE classification unit 2042.

[0094] For example, the higher the quality indicated by the FH quality information, the threshold (or threshold range) may be determined to a value (or range) such that the number of UEs 2 to which a high MCS is applied (in other words, with low FH residual distortion tolerance) increases.

[0095] Conversely, for example, the threshold (or threshold range) may be determined to be a value (or threshold range) such that the lower the quality indicated by the FH quality information, the greater the number of UEs 2 to which a low MCS is applied (in other words, having high FH residual distortion tolerance).

[0096] The threshold information determined by the threshold setting unit 2041 and the CQI fed back from UE 2 via the UL signal may also be input to the UE classification unit 2042. For example, based on the threshold information and the CQI, the UE classification unit 2042 classifies UE 2 into a UE group to which a high MCS (low FH residual distortion tolerance) is applied and a UE group to which a low MCS (high FH residual distortion tolerance) is applied. Furthermore, the number of UE groups to be classified may be two or more, similar to the FH resource division interval.

[0097] For example, information on the UE group (hereinafter sometimes referred to as "UE classification information") is output to the scheduling unit 2043 together with the CQI of each UE 2. In some cases, the number of UE 2 constituting the UE group may be "1".

[0098] For example, the scheduling unit 2043 determines, from among the UEs 2 in the classified UE group, a UE 2 to which a communication opportunity (e.g., radio resources and FH resources) is to be allocated based on the UE classification information from the UE classification unit 2042. For example, the scheduling unit 2043 outputs a DL signal to the physical channel processing unit 205, which is addressed to the UE 2 to which the communication opportunity allocation has been determined.

[0099] Furthermore, for example, the scheduling unit 2043 outputs control information regarding the FH transmission method applied when the FH transmitter 30 transmits a signal regarding a UE group that determines the allocation of communication opportunities to the FH 13 (hereinafter sometimes referred to as "FH control information") to the FH transmitter 30. The FH control information may also include, for example, information regarding the FH transmission method for each interval #j (hereinafter sometimes referred to as "FH transmission method information #j").

[0100] The DL signal output to the physical channel processing unit 205 may include, for example, at least one of user data and DL control information (also referred to as “UE control information” or “radio control information”) used by the UE 2 to decode the user data.

[0101] The DL control information may also include information such as MCS and mapping information for allocated radio resources (eg, RBs, REs) (or parameters related to wireless communication).

[0102] In the physical channel processing unit 205, user data is mapped to resources such as PDSCH (physical downlink shared channel), which is an example of a physical data channel, and DL control information is mapped to resources such as PDCCH (physical downlink control channel), which is an example of a physical control channel.

[0103] For example, the physical channel processing unit 205 performs signal processing such as encoding, scrambling, modulation, and RE mapping on user data to form (or generate) a PDSCH signal. Furthermore, for example, the physical channel processing unit 205 performs signal processing on DL control information to form a PDCCH signal based on control information used by UE 2 for demodulation of the PDSCH signal. The signal processing performed by the physical channel processing unit 205 can also be replaced with "physical layer processing."

[0104] The encoding process may include, for example, adding a CRC (cyclic redundancy check) code to the transport block input from the MAC unit 204 and dividing the transport block into code blocks. The encoding process may also include, for example, encoding of the code blocks and rate matching according to the MCS.

[0105] The modulation process may also employ modulation schemes such as QPSK (quadrature phase shift keying), 16QAM (quadrature amplitude modulation), 64QAM, and 256QAM.

[0106] Furthermore, when MIMO (Multiple-Input and Multiple-Output) transmission is applied in the wireless transmission section, the processing in the physical channel processing unit 205 may include, for example, a layer mapping processing unit and a precoding processing.

[0107] For example, the output signal of the physical channel processing unit 205 is sent to the FH transmitter 30. Furthermore, the channels processed by the physical channel processing unit 205 are not limited to the PDSCH and PDCCH. Signals of other DL channels, such as the broadcast channel (physical broadcast channel (PBCH)), may also be processed by the physical channel processing unit 205.

[0108] For convenience, the signals output from the physical channel processing unit 205 may be collectively referred to as "physical channel signals." Furthermore, the signals output from the physical channel processing unit 205 may be transmitted in parallel to the FH transmitter 30 via physically different signal lines, or may be multiplexed into a single physical signal line and transmitted to the FH transmitter 30. Non-limiting examples of multiplexing methods include time division multiplexing (TDM), frequency division multiplexing (FDM), code division multiplexing (CDM), and wavelength division multiplexing (WDM).

[0109] The FH control information output from the scheduling unit 2043 may be multiplexed with the output signal of the physical channel processing unit 205 and transmitted to the FH transmitter 30. Alternatively, the FH control information may be transmitted to the FH transmitter 30 physically separated without being multiplexed with the physical channel signal.

[0110] (FH transmitter 30)

[0111] Next, refer to Figure 3 An example of the structure of the FH transmitter 30 will be described. Figure 3 As illustrated, the FH transmitter 30 includes, for example, an FH control information analysis unit 301 , an FH transmission processing unit 302 , a multiplexing unit 303 , a transmitting unit 304 , a receiving unit 305 , and a measuring unit 306 .

[0112] For example, the FH control information analysis unit 301 determines the FH transmission scheme (e.g., FH transmission parameters such as code type, coding rate, and modulation multi-level number) to be applied to section #j based on the FH control information for section #j input from the master station processing unit 20 (e.g., the scheduling unit 2043 of the MAC unit 204). Furthermore, for example, the FH control information analysis unit 301 outputs the FH control information including the determined FH transmission scheme information #j for section #j to the FH transmission processing unit 302.

[0113] The FH transmission processing unit 302 includes, for example, an FH encoding processing unit 3021 and an FH modulation processing unit 3022 .

[0114] For example, the FH encoding processing unit 3021 encodes the physical channel signal of section #j input from the master station processing unit 20 according to the code type and coding rate included in the FH transmission method information #j input from the FH control information analysis unit 301 and outputs it to the FH modulation processing unit 3022.

[0115] For example, the FH modulation processing unit 3022 modulates the output signal corresponding to section #j of the FH encoding processing unit 3021 into a multi-value modulation signal such as QPSK, 16QAM, 64QAM, or 256QAM, according to the modulation multi-value number included in the FH transmission method information #j. The modulated signal is then output to the multiplexing unit 303. The "modulation multi-value number" is not limited to 256 or less and may be, for example, a multi-value number greater than 256.

[0116] The multiplexing unit 303 multiplexes, for example, the output signal of the FH transmission processing unit 302 (FH modulation processing unit 3022) with the FH control information including the FH transmission scheme information #j output from the FH control information analysis unit 301, and outputs the multiplexed information to the transmitting unit 304. For example, the FH control information is used by the FH receiver 40 of the slave station device 12 to demodulate and decode the FH transmission signal for each interval #j. As a non-limiting example, the multiplexing scheme in the multiplexing unit 303 may be any of TDM, FDM, and CDM.

[0117] For example, the transmitter 304 performs transmission processing (e.g., packet formation processing, header addition processing, etc.) corresponding to a wired transmission unit (or wired interface) such as a UTP cable, an STP cable, or an optical fiber cable on the output signal of the multiplexer 303, and transmits the signal to the FH 13.

[0118] When using an optical fiber cable, for example, an electrical / optical (E / O) converter (not shown) may be provided in the transmitter 304. WDM may also be applied to the E / O converter. In other words, the multiple signals transmitted from the master station 11 to the FH 13 may be multiplexed using any of TDM, FDM, CDM, and WDM.

[0119] In addition, the multiplexing unit 303 may be omitted. For example, the physical channel signal and the FH control information may be physically separated and sent to the slave station device 12 without being multiplexed. When the multiplexing unit 303 is omitted, the separation unit 402 (later in Figure 4 can also be omitted.

[0120] The receiving unit 305 receives a signal transmitted from the FH receiver 40 of the slave device 12 to the FH 13 toward the master device 11 , receives a known signal (eg, a training signal) between the master device 11 and the slave device 12 , and outputs the signal to the measuring unit 306 .

[0121] For example, the measurement unit 306 measures the reception quality of the signal input from the reception unit 305 (in other words, the transmission quality of the FH 13) and outputs the quality measurement result as, for example, FH quality information to the master station processing unit 20 (e.g., the threshold setting unit 2041 of the MAC unit 204). The FH quality information may be transmitted to the master station processing unit 20 via the FH 13 or may be transmitted to the master station processing unit 20 via a communication path different from that of the FH 13.

[0122] In addition, although Figures 2 to 4Although not shown in the figure, the channel quality information UL transmitted (feedback) by the UE 2 is output (or transferred) to the master processing unit 20 (eg, the UE classification unit 2042 ) via the slave processing unit 50 , the FH receiver 40 , and the FH transmitter 30 .

[0123] In addition, one or both of the receiving unit 305 and the measuring unit 306 may be implemented in the master station device 11 , and may be implemented in a functional block different from the FH transmitter 30 in the master station device 11 .

[0124] <Slave Device 12>

[0125] Next, Figure 1 An example of the structure of the slave device 12 is described below. Figure 1 As illustrated, the slave device 12 includes, for example, an FH receiver 40 and a slave processing unit 50 . Figure 4 An example of the structure of the FH receiver 40 is shown. Figure 5 An example of the configuration of the slave processing unit 50 is shown.

[0126] (FH receiver 40)

[0127] like Figure 4 As illustrated, the FH receiver 40 includes, for example, a receiving unit 401 , a separating unit 402 , an FH control information analyzing unit 403 , an FH reception processing unit 404 , a training signal generating unit 405 , and a transmitting unit 406 .

[0128] For example, 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 .

[0129] For example, the separator 402 separates the FH control information and the physical channel signal included in the output signal of the receiver 401 , outputs the FH control information to the FH control information analyzer 403 , and outputs the physical channel signal to the FH reception processor 404 .

[0130] For example, the FH control information analysis unit 403 determines (or recognizes) the FH transmission method used in section #j in the FH transmitter 30 of the master station 11 based on the FH control information for section #j, and outputs information regarding the determined FH transmission method for section #j to the FH reception processing unit 404. Alternatively, the FH control information analysis unit 403 in the FH receiver 40 and the FH control information analysis unit 301 in the FH transmitter 30 may be shared within the wireless base station 1.

[0131] The FH reception processing unit 404 includes, for example, an FH demodulation processing unit 4041 and an FH decoding processing unit 4042 .

[0132] For example, the FH demodulation processing unit 4041 applies a demodulation process corresponding to the modulation process applied to section #j in the FH transmitter 30 of the master station apparatus 11 to the physical channel signal from the separation unit 402, based on the FH transmission scheme information #j of the FH control information input from the FH control information analysis unit 403. The signal demodulated by this demodulation process is output to the FH decoding processing unit 4042.

[0133] For example, based on FH transmission scheme information #j, FH decoding processing section 4042 applies a decoding process corresponding to the encoding process applied to section #j in FH transmitter 30 to the output signal of FH demodulation processing section 4041. This decoding process decodes the physical channel signal and transmits it to slave station processing section 50.

[0134] For example, the training signal generation unit 405 generates a known signal for measuring the transmission quality of the FH 13 and outputs it to the transmission unit 406. A non-limiting example of a "known signal" is a training signal (or data) used in a pre-specified sequence between transmission and reception. The training signal may also be referred to as a pilot signal, reference signal, or other term.

[0135] For example, the transmitter 406 transmits the training signal to the FH 13 connected to the master station 11. The training signal transmitted to the FH 13 is received by the receiver 305 (see FIG. 3 ) of the FH transmitter 30 in the master station 11. Figure 3 )take over.

[0136] Alternatively, the transmission quality of the FH 13 may be measured by, for example, transmitting a training signal in the reverse direction (in other words, the DL direction). For example, the training signal transmitted from the FH transmitter 30 of the master station 11 to the FH receiver 40 of the slave station 12 may be received and measured by the FH receiver 40, and the measurement result may be fed back to the FH transmitter 30.

[0137] In addition, one or both of the training signal generation unit 405 and the transmission unit 406 may be installed inside the FH receiver 40 or inside the slave station device 12 .

[0138] (Slave Processing Unit 50)

[0139] like Figure 5 As illustrated, the slave station processing unit 50 includes, for example, a physical channel processing unit 501 , a D / A (digital to analog) converter 502 , and a radio (RF) unit 503 .

[0140] The physical channel processing unit 501 performs signal processing on the physical channel signal included in the FH transmission signal demodulated and decoded by the FH receiver 40. This signal processing may include, for example, beamforming, IFFT (Inverse Fast Fourier Transform), and CP (Cyclic Prefix) insertion. The signal processing performed by the physical channel processing unit 501 may also be replaced with "physical layer processing." If beamforming is not implemented in the slave station device 12, the beamforming processing may also be omitted.

[0141] Furthermore, the physical channel processing unit 205 in the master station processing unit 20 and the physical channel processing unit 501 in the slave station processing unit 50 have the following relationship: due to the functional division point between the master station apparatus 11 and the slave station apparatus 12, some of the multiple signal processing functions (functions) for physical channel signals are performed in the former, while the remainder are performed in the latter. As described below, there are various functional division points, but any functional division point can be applied in the first embodiment and the second to fourth embodiments described later.

[0142] For example, the D / A converter 502 converts the output signal of the physical channel processor 501 from a digital signal to an analog signal.

[0143] For example, the RF unit 503 performs transmission RF processing such as up-conversion to a radio frequency or amplification on the output of the D / A converter 502. For example, the wireless signal generated by the transmission RF processing is radiated into space (e.g., transmitted to UE 2) via an antenna (not shown) mounted on the RF unit 503.

[0144] <Operation example>

[0145] Next, refer to Figure 6 An example of the operation of the wireless communication system involved in the first embodiment is described with reference to the timing diagram of FIG.

[0146] like Figure 6 As shown in the example, in the wireless base station 1, the training signal is transmitted from the transmitter 406 (see FIG. 4 ) of the FH receiver 40 in the slave station device 12. Figure 4 ) is transmitted to the FH 13 toward the master station device 11 (S601). For example, the training signal may be transmitted at a specific timing when the wireless communication system is activated or after the activation.

[0147] For example, to alleviate the shortage of the FH band, a specific timing may be set during a period of time when the traffic volume of the FH 13 is relatively low (e.g., early morning or late at night). In addition, in order to cope with (e.g., compensate for or correct) the changes in FH transmission quality over time, a training signal may be transmitted (in other words, retransmitted) from the FH receiver 40 at appropriate timing.

[0148] For example, the training signal is received by the receiving unit 305 of the FH transmitter 30 (see Figure 3 ) and is input to the measuring unit 306. The measuring unit 306 measures the reception quality (for example, SNR) of the input training signal (S602).

[0149] For example, information (measurement information) indicating the measurement result of the measurement unit 306 is output to the MAC unit 204 (for example, the threshold setting unit 2041 ) of the master station processing unit 20 ( S603 ).

[0150] In the master station processing unit 20, the threshold setting unit 2041 determines (or sets) a threshold (or threshold range) for switching the FH transmission method based on the FH quality information (S604). As a non-limiting example, the threshold setting unit 2041 Figure 7 In the illustrated MCS table 700 , the threshold is determined (or set) to be MCS index = 11. The determined threshold information is output to the UE classification unit 2042 .

[0151] In addition, the threshold information may be re-determined (or reset) based on changes in the FH transmission quality due to the retransmission of the training signal. Furthermore, for example, the MCS table 700 is an example of information that represents multiple combinations (or associations) of radio parameters defining a radio transmission scheme such as a modulation order and a coding rate, in association with an index (MCS index).

[0152] The UE classification unit 2042 classifies (or groups) the UE 2 based on the threshold information from the threshold setting unit 2041 and the channel quality information fed back from the UE 2 ( S605 ) ( S606 ).

[0153] For example Figure 7 As shown, the UE classification unit 2042 classifies UE 2 with an applied MCS index less than 11 (i.e., 0 to 10) into Group #1 (low MCS terminal group) based on the channel quality information. On the other hand, the UE classification unit 2042 classifies UE 2 with an applied MCS index of 11 or higher into Group #2 (high MCS terminal group) based on the channel quality information.

[0154] In addition, Figure 7In the figure, "Modulation order" k=2 means the modulation multi-value number = 4 (QPSK), k=4 means the modulation multi-value number = 16 (16QAM), k=6 means the modulation multi-value number = 64 (64QAM), and k=8 means the modulation multi-value number = 256 (256QAM).

[0155] In addition, Figure 7 In the threshold setting shown in the example, at least different coding rates are applied to each other between UE group #1 and UE group #2 (in other words, between interval #1 and interval #2). Regarding the modulation multi-value number (modulation order k), QPSK (k=2) or 16QAM (k=4) is applied to UE group #1, and 16QAM (k=4) or 64QAM (k=6) or more is applied to UE group #2. In other words, Figure 7 In the threshold setting example, the same modulation multi-value number is sometimes applied to UE group #1 and UE group #2. It can also be understood that if at least one of the multiple parameters defining the FH transmission method is different, the FH transmission method is different.

[0156] In addition, for example, Figure 7 The illustrated MCS table 700 may be stored in a storage unit (not shown) accessible to the UE classification unit 2042. The storage unit may be installed in the UE classification unit 2042 or the MAC unit 204, or may be installed outside the MAC unit 204 or inside the master station processing unit 20. Alternatively, the storage unit may be installed in an external device of the master station apparatus 11 that is accessible via a communication line, for example.

[0157] For example, information on the classified UE group (UE classification information) is output to the scheduling unit 2043 together with the channel quality information of each UE 2 .

[0158] For example, the scheduling unit 2043 determines the UE 2 to which the communication opportunity is to be allocated for each of the classified UE groups based on the UE classification information from the UE classification unit 2042 ( S607 ).

[0159] Figure 8A A non-limiting example of allocation of communication opportunities (in other words, scheduling) performed by the scheduling unit 2043 focusing on FH resources is shown.

[0160] exist Figure 8A In the example, interval #1 is allocated to UE group #1 (UE #1 to #4) to which a low MCS smaller than a threshold value (11) such as an MCS index of 2, 5, or 6 is applied. In addition, interval #2 is allocated to UE group #2 (UE #5 to #7) to which a high MCS greater than a threshold value such as an MCS index of 17, 19, or 20 is applied.

[0161] Here, since UE group #1 to which a low MCS is applied (in other words, with high tolerance to FH residual distortion) is allocated to interval #1, an FH transmission method with lower error tolerance than interval #2 may be applied.

[0162] As a non-limiting example, the scheduling unit 2043 may apply a coding rate (R) = 1 (i.e., no error correction) and 16QAM to the FH transmission method of interval #1, and apply a coding rate (R) = 5 / 6 and QPSK to the FH transmission method of the signal of interval #2.

[0163] In each of interval #1 and interval #2, resources divided on at least one of the time axis and the frequency axis may be allocated to UE 2.

[0164] For example Figure 8A As shown, each of interval #1 and interval #2 may be divided into intervals corresponding to a plurality of (eg, two) subframes (hereinafter sometimes referred to as "subframe intervals") on the time axis.

[0165] In the first subframe of interval #1, for example, DL signals sent to each of UE#1 to UE#3 may also be mapped (in other words, FDM) to different frequency resources. Furthermore, in the second subframe of interval #1, for example, DL signals sent to each of UE#1 and UE#4 may also be FDMed.

[0166] Similarly, in the second subframe interval of interval #2, for example, DL signals addressed to UE #6 and UE #7 may also be FDMed. Furthermore, for example, in the first subframe interval of interval #2, DL signals addressed to UE #5 may be mapped without being FDMed with DL signals addressed to other UEs 2. In other words, frequency resources (e.g., multiple RBs) that can be used for FDM of DL signals addressed to multiple UEs 2 may also be allocated to (or occupied by) a DL signal addressed to a single UE 2 (the same applies in the following description).

[0167] The length of each interval #1 and interval #2 (interval length) may be fixed or adaptively changed according to the number of UEs 2 constituting one UE group. For example, the scheduling unit 2043 may set a longer interval length for a UE group with a larger number of UEs.

[0168] A non-limiting example is Figure 8B Shown in. Figure 8B An example of scheduling is shown when the number of UEs in UE group #2 to which high MCS is applied (e.g., 6 UEs from UE#4 to UE#9) is greater than the number of UEs in UE group #1 to which low MCS is applied (e.g., 3 UEs from UE#1 to UE#3).

[0169] In this case, if Figure 8B As shown in the example, the scheduling unit 2043 may also set the length of interval #2 to which the UE group #2 to which the high MCS is applied is allocated to be longer than the length of interval #1. Figure 8A Likewise, in Figure 8B For example, an FH transmission method with lower error tolerance than that of section #2 may be applied to section #1 of UE group #1 to which a low MCS is assigned.

[0170] exist Figure 8B In the example, the schedule in interval #1 can also be Figure 8A The same. Alternatively, for example, in the first subframe of interval #2, the DL signals sent to UE #4 and UE #5 may also be FDMed. For example, in the third subframe of interval #2, the DL signals sent to UE #7 through UE #9 may also be FDMed. Furthermore, in the second subframe of interval #2, the DL signal sent to UE #6 may be mapped without FDMing with the DL signal sent to another UE 2.

[0171] In addition, the above Figure 8B The interval length may be set (or controlled) based on the amount of FH resources allocated to a UE group. For example, a longer interval length may be set for a UE group with a small number of UEs but a large amount of allocated FH resources.

[0172] exist Figure 6 For example, the scheduling unit 2043 transmits FH control information including FH transmission scheme information #1 and #2 applied to the signals of the scheduled UE groups #1 and #2, respectively, from the FH transmitter 30 to the FH receiver 40 (S609).

[0173] Furthermore, the signals of the scheduled UE groups #1 and #2 are processed in the physical channel processing unit 205 and then transmitted to the UE 2 via the FH transmitter 30, FH 13, FH receiver 40, and slave station processing unit 50 (S610).

[0174] In addition, Figure 8A as well as Figure 8B In the illustrated scheduling example, UE group #1 with a low MCS is assigned to interval #1, and UE group #2 with a high MCS is assigned to interval #2. However, this is not limiting. For example, the reverse can be applied, with UE group #2 with a high MCS assigned to interval #1 and UE group #1 with a low MCS assigned to interval #2.

[0175] As described above, according to the first embodiment, different FH resources (eg, time intervals) are allocated to UE 2 with high FH residual distortion tolerance (eg, low MCS terminal) and UE 2 with low FH residual distortion tolerance (eg, high MCS terminal).

[0176] In other words, in one time interval #j during FH transmission, UEs 2 with the same or similar (or similar) FH residual distortion tolerance are scheduled. Therefore, the FH transmission scheme to be applied can be optimized for each UE group with the same or similar FH residual distortion tolerance during FH transmission, thereby improving FH transmission efficiency.

[0177] Furthermore, scheduling for interval #j may be performed based not only on UE classification information but also on information related to the service category of the DL signal transmitted by FH to UE 2. For example, DL signals for services requiring low-latency transmission may be preferentially allocated to the earlier intervals in time among the multiple intervals #j.

[0178] <Implementation Method 2>

[0179] Next, refer to Figures 9 to 12 Embodiment 2 will be described. While Embodiment 1 described an example of dividing the FH resource into a plurality of intervals #j on the time axis, Embodiment 2 will describe an example of dividing the FH resource into a plurality of intervals #j on the frequency axis.

[0180] Figure 9 FIG. 1 is a diagram showing an example of the intervals into which FH resources are divided on the frequency axis and the scheduling of each interval according to the second embodiment. Figure 9 As illustrated, the frequency resources usable in FH transmission may be divided into a plurality of (eg, two) intervals #1 and #2.

[0181] For example, a DL signal transmitted to UE#2 to which a low MCS (eg, MCS index=5) is applied (in other words, the FH residual distortion tolerance is high) may also be allocated to the first interval #1.

[0182] In addition, Figure 9 , an example is shown in which the DL signal addressed to UE#2 is allocated across multiple (e.g., two) subframes in interval #1, but the present invention is not limited thereto. For example, in interval #1, the DL signal addressed to UE#2 may be allocated to one subframe, or the DL signal addressed to UE#2 may be allocated to three or more subframes.

[0183] On the other hand, for example, DL signals sent to each of UE#2, UE#3 and UE#4 to which high MCS (e.g., MCS index = 18, 19, or 20) is applied (in other words, FH residual distortion tolerance is low) can also be allocated to the second interval #2.

[0184] For example, the DL signal sent to UE#2 (MCS index = 20) and the DL signal sent to UE#3 (MCS index = 20) can also be mapped (in other words, FDM) to different frequency resources in the first subframe in interval #1. In addition, the DL signal sent to UE#4 (MCS index = 18) can also be mapped to the second subframe of interval #2 without being FDMed with the DL signal sent to other UE 2.

[0185] Next, for example, in section #1 to which a UE group with high FH residual distortion tolerance is allocated, a FH transmission method with lower error tolerance may be applied than in section #2 to which a UE group with low FH residual distortion tolerance is allocated.

[0186] As a non-limiting example, similar to the first embodiment, the FH transmission method of interval #1 can also be applied with a coding rate (R) = 1 (i.e., no error correction) and 16QAM, and the FH transmission method of the signal of interval #2 can be applied with a coding rate (R) = 5 / 6 and QPSK.

[0187] In addition, Figure 9 In the example, UE group #1 with low MCS is assigned to interval #1, and UE group #2 with high MCS is assigned to interval #2, but the present invention is not limited to this. For example, the opposite situation may be that UE group #2 with high MCS is assigned to interval #1, and UE group #1 with low MCS is assigned to interval #2.

[0188] Alternatively, physically different FHs 13 may be prepared for different sections #j. For example, signals for each section #j may be transmitted in parallel via physically different FHs 13, or may be multiplexed and transmitted within a single physical cable using a multiplexing method such as TDM, CDM, or WDM.

[0189] Hereinafter, an example of the configuration of the master station device 11 and the slave station device 12 according to the second embodiment will be described. In addition, an example of the configuration of the wireless base station 1 including the master station device 11 and the slave station device 12 may also be the same as that of the first embodiment ( Figure 1 )same.

[0190] In the second embodiment, the master station device 11 includes, for example, Figure 10 The master processing unit 20A and Figure 11 On the other hand, in the second embodiment, the slave device 12 includes, for example, Figure 12In the second embodiment, the slave processing unit 50 of the slave device 12 can also be connected to the FH receiver 40A. Figure 5 The illustrated structures are the same.

[0191] <Master Station Device 11>

[0192] (Master Station Processing Unit 20A)

[0193] like Figure 10 As shown in the example, the master station processing unit 20A in the second embodiment may also have Figure 2 In the illustrated configuration, the physical channel processing unit 205 is provided for each of a plurality of (frequency) sections #j.

[0194] exist Figure 10 For example, the scheduling unit 2043 determines, from among the UEs 2 in the classified UE group, which UE 2 is to be assigned to frequency interval #j, based on the UE classification information from the UE classification unit 2042. For example, the scheduling unit 2043 outputs a DL signal destined for UE 2 assigned to frequency interval #j to the physical channel processing unit 205-j corresponding to frequency interval #j. Furthermore, for example, the scheduling unit 2043 outputs FH control information including FH transmission scheme information #j for each frequency interval #j to the FH transmitter 30A.

[0195] As in the first embodiment, each physical channel processing unit 205-j applies signal processing for physical channels such as the PDSCH and PDCCH to DL signals addressed to, for example, UE 2 allocated to frequency interval #j. In other words, in the second embodiment, DL signals addressed to UE 2 are processed in parallel for each frequency interval #j.

[0196] The FH control information may be multiplexed with the physical channel signal and transmitted to the FH transmitter 30A, or may be physically separated and transmitted to the FH transmitter 30A without being multiplexed with the physical channel signal. Furthermore, the master station processing unit 20A need not necessarily have a configuration in which the physical channel processing unit 205 is provided for each of the multiple (frequency) sections #j. For example, a single physical channel processing unit 205 may perform signal processing for multiple frequency sections #j in parallel.

[0197] (FH transmitter 30A)

[0198] On the other hand, Figure 11 As shown in the example, it can also be understood that Figure 3 In the illustrated configuration, the FH transmitter 30A has a configuration in which the FH transmission processing unit 302 , the multiplexing unit 303 , and the transmitting unit 304 are provided for each frequency section #j.

[0199] Each of the FH transmission processing units 302 - j may include functional units equivalent to the FH encoding processing unit 3021 and the FH modulation processing unit 3022 described in the first embodiment.

[0200] For example, the multiplexing unit 303-j multiplexes the DL signals (physical channel signals) processed in parallel for each frequency section #j in the FH transmission processing unit 302-j and the FH control information (FH transmission mode information #j) input for each frequency section #j from the FH control information analysis unit 301.

[0201] For example, the sending unit 304-j performs sending processing (e.g., packet formation processing or header addition processing, etc.) corresponding to a wired transmission unit (or wired interface) such as a UTP cable, an STP cable, or an optical fiber cable on the output signal of the corresponding multiplexing unit 303-j, and sends it to the FH 13.

[0202] In other words, in the FH transmitter 30A, the DL signal for each frequency interval #j received from the master station processing unit 20A is processed in parallel for each frequency interval #j, multiplexed with the FH control information including the corresponding FH transmission scheme information #j, and transmitted to the FH 13.

[0203] Furthermore, when using an optical fiber cable for FH 13, for example, an E / O converter (not shown) may be provided in the transmitter 304-j. WDM may also be applied to the E / O converter. In other words, in the second embodiment, the signal for each section #j transmitted from the master station 11 to the FH 13 may be multiplexed using any of TDM, FDM, CDM, and WDM.

[0204] In addition, the multiplexing unit 303-j may be omitted. For example, the physical channel signals and FH control information of each frequency interval #j may not be multiplexed but may be physically separated and transmitted to the slave station apparatus 12. When the multiplexing unit 303-j is omitted, the separation unit 402-j (later in Figure 12 ) can also be omitted.

[0205] In addition, in the FH transmitter 30A, it is not necessary to have a structure in which the FH transmission processing unit 302, the multiplexing unit 303 and the transmitting unit 304 are respectively provided for multiple (frequency) intervals #j. For example, it can also be a structure in which, for example, one FH transmission processing unit 302, the multiplexing unit 303 and the transmitting unit 304 perform signal processing for multiple frequency intervals #j in parallel.

[0206] <Slave Device 12>

[0207] (FH Receiver 40A)

[0208] Figure 12 This is a block diagram showing an example of the configuration of the FH receiver 40A in the slave station device 12 according to the second embodiment.

[0209] At once Figure 12 For the illustrated FH receiver 40A, Figure 4 In the illustrated configuration, each of the receiving unit 401, separating unit 402, and FH reception processing unit 404 (FH demodulation processing unit 4041 and FH decoding processing unit 4042) may be provided separately for each frequency interval #j. Furthermore, the FH receiver 40A may include, for example, a multiplexing unit 407 for multiplexing the output signals of the FH reception processing unit 404-j.

[0210] In the FH receiver 40A, each separator 402-j separates the FH control information (FH transmission scheme information #j) for frequency segment #j and inputs it to the FH control information analyzer 403. Furthermore, the FH transmission scheme information #j is input from the FH control information analyzer 403 to the corresponding FH reception processor 404-j for each frequency segment #j.

[0211] Therefore, the DL signals received from the FH transmitter 30A in the receiving unit 401 - j in each frequency section #j are subjected to reception processing including demodulation and decoding in parallel in the FH reception processing unit 404 - j in each frequency section #j and are output to the multiplexing unit 407 .

[0212] For example, the multiplexing unit 407 multiplexes the output signals of the FH reception processing unit 404-j and outputs the multiplexed signals to the slave processing unit 50. In the second embodiment, the structure and operation of the slave processing unit 50 may be the same as those exemplified in the first embodiment ( Figure 5 ) and the same operation.

[0213] The operation example of the wireless base station 1 involved in the second embodiment can also be understood as equivalent to Figure 6 In the description of the timing chart shown as an example, the (time) interval #j is replaced with the frequency interval #j, and the signal is processed separately for each frequency interval #j.

[0214] For example, scheduling ( S607 ) is performed for frequency segment #j, and transmission ( S608 , S609 ) of FH control information (FH transmission scheme information #j) and transmission of DL signals ( S610 ) are performed in parallel for each frequency segment #j.

[0215] As described above, according to the second embodiment, different frequency sections are allocated in FH resources to UE 2 with high FH residual distortion tolerance (eg, low MCS terminal) and UE 2 with low FH residual distortion tolerance (eg, high MCS terminal).

[0216] In other words, in one frequency bin #j during FH transmission, UEs 2 having the same or similar (or similar) FH residual distortion tolerance are scheduled. Therefore, similarly to the first embodiment, the FH transmission scheme to be applied can be optimized for each UE group having the same or similar FH residual distortion tolerance during FH transmission, thereby improving FH transmission efficiency.

[0217] Furthermore, in the second embodiment, scheduling is performed for frequency interval #j of the FH resources, enabling DL signals for multiple UE groups to be transmitted in parallel (e.g., at the same timing). Therefore, even if DL signals for multiple UEs 2 utilizing the same service are allocated to different frequency intervals #j, variations in transmission delay between UE groups can be suppressed.

[0218] In addition, scheduling for frequency interval #j may be performed based not only on UE classification information but also on information related to the service type of the DL signal transmitted by the FH to the UE 2, for example.

[0219] Furthermore, since the second embodiment divides the FH resources on the frequency axis, it can be applied to a functional division structure in which, for example, a functional unit for processing a signal before IFFT is included in both the master station apparatus 11 and the slave station apparatus 12 .

[0220] In addition, in the FH receiver 40A, it is not necessary to Figure 4 The receiving unit 401, separating unit 402 and FH receiving processing unit 404 (FH demodulation processing unit 4041 and FH decoding processing unit 4042) in the illustrated structure are respectively provided for a plurality of (frequency) intervals #j. Alternatively, a structure may be adopted in which, for example, each of the receiving unit 401, separating unit 402 and FH receiving processing unit 404 (FH demodulation processing unit 4041 and FH decoding processing unit 4042) performs signal processing for a plurality of frequency intervals #j in parallel.

[0221] In addition, Figure 12 In the embodiment, the multiplexing unit 407 may be omitted. For example, the outputs of the FH reception processing unit 404-j may be input in parallel to the slave processing unit 50. In this case, the slave processing unit 50 may be configured to perform physical channel processing on each of the parallel input signals, or to collectively perform physical channel processing on signals mapped to the same physical channel among the parallel input signals.

[0222] <Implementation Method 3>

[0223] In the third embodiment, the UL structure corresponding to the DL structure described in the first embodiment is described. Furthermore, the term "interval #j" used in the description of the third embodiment (and the fourth embodiment described later) is for the convenience of explaining that the FH resources are divided into multiple intervals, as described in the first embodiment (or the second embodiment). This does not necessarily mean that the UL-related interval #j must be the same as the DL-related interval #j described above. The UL-related interval #j may be the same as the DL interval #j, or different. In other words, the number of intervals divided in the UL and DL can be set independently.

[0224] Figure 13 FIG is a diagram showing an example of the structure of a wireless communication system according to the third embodiment. Figure 13 As illustrated, with regard to UL communication from UE 2 to wireless base station 1 , wireless base station 1 includes, for example, a slave processing unit 60 and an FH transmitter 70 in the slave station device 12 , and includes, for example, an FH receiver 80 and a master processing unit 90 in the master station device 11 .

[0225] Figure 14 as well as Figure 15 An example of the configuration of the slave station device 12 (slave station processing unit 60 and FH transmitter 70) focusing on UL is shown. Figure 16 as well as Figure 17 An example of the configuration of the master station device 11 (the FH receiver 80 and the master station processing unit 90 ) focusing on the UL is shown.

[0226] <Slave Device 12>

[0227] First, refer to Figure 14 as well as Figure 15 An example of the configuration of the slave processing unit 60 and the FH transmitter 70 in the slave device 12 will be described. Similarly to the first embodiment, two or more slave devices 12 can be connected to one master device 11, and one slave device 12 can be connected to two or more UEs 2.

[0228] (Slave Processing Unit 60)

[0229] like Figure 14 As illustrated, the slave station processing unit 60 includes, for example, an RF unit 601 , an A / D (analog to digital) converter 602 , and a physical channel processing unit 603 .

[0230] For example, the RF unit 601 includes an antenna, receives a UL radio 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 radio signal.

[0231] For example, the A / D conversion unit 602 converts the output (analog signal) of the RF unit 601 into a digital signal.

[0232] For example, the physical channel processing unit 603 applies physical channel signal processing such as CP removal, FFT (Fast Fourier Transform), and beamforming to the output of the A / D conversion unit 602. Furthermore, if beamforming is not performed in the slave station device 12, beamforming may be omitted.

[0233] (FH transmitter 70)

[0234] On the other hand, Figure 15 As illustrated, the FH transmitter 70 includes a receiving unit 701 , an FH control information analyzing unit 702 , an FH transmission processing unit 703 , a transmitting unit 704 , a training signal generating unit 705 , and a transmitting unit 706 .

[0235] For example, the receiving unit 701 may Figure 17 The master station processing unit 90 (for example, the scheduling unit 9023) described in the above is determined to receive the data from the following Figure 16 The FH receiver 80 is described as sending FH control information.

[0236] For example, the FH control information analysis unit 702 outputs the FH transmission method information #j included in the FH control information received by the reception unit 701 to the FH transmission processing unit 703 .

[0237] For example, the FH control information from the FH control information analyzer 702 and the output signal (UL signal) from the slave processing unit 60 are input to the FH transmission processor 703. The FH transmission processor 703 includes, for example, an FH encoding processor 7031 and an FH modulation processor 7032.

[0238] For example, the FH encoding processing unit 7031 encodes the physical channel signal of section #j input from the slave station processing unit 60 according to the code type and coding rate included in the FH transmission mode information #j from the FH control information analysis unit 702, and outputs it to the FH modulation processing unit 7032.

[0239] For example, FH modulation processing unit 7032 modulates the output signal corresponding to interval #j from FH encoding processing unit 7031 into a multi-value modulation signal such as QPSK, 16QAM, 64QAM, or 256QAM, according to the modulation multi-value number included in FH transmission scheme information #j. The modulated signal is then output to transmission unit 704.

[0240] For example, the transmission unit 704 performs transmission processing (e.g., packet formation processing or header addition processing) corresponding to a wired transmission unit (or wired interface) such as a UTP cable, an STP cable, or an optical fiber cable on the output signal of the FH transmission processing unit 703, and transmits the signal to the FH 13.

[0241] For example, the training signal generating unit 705 generates a training signal as an example of a known signal for measuring the transmission quality of the FH 13 , similarly to the first embodiment, and outputs the training signal to the transmitting unit 706 .

[0242] For example, the transmitter 706 transmits the training signal to the FH 13 connected to the master station 11. For example, the training signal transmitted to the FH 13 is received by the receiver 805 (see FIG. 1 ) of the FH receiver 80 in the master station 11. Figure 16 )take over.

[0243] Furthermore, as supplemented in the first embodiment, the transmission quality measurement of the FH 13 can also be performed by, for example, transmitting a training signal in the reverse direction (in other words, the DL direction). For example, the training signal transmitted from the FH receiver 80 of the master station 11 to the FH transmitter 70 of the slave station 12 is received and measured by the FH transmitter 70, and the measurement result is fed back to the FH receiver 80.

[0244] In addition, one or both of the training signal generating unit 705 and the transmitting unit 706 may be installed inside the FH transmitter 70 , or may be installed inside the slave station device 12 .

[0245] The FH control information analysis unit 702 can also Figure 4 The training signal generating unit 705 may also be used in conjunction with the FH control information analyzing unit 403. Figure 4 The sending unit 706 can also be used with the training signal generating unit 405 shown in the example. Figure 4 The illustrated sending unit 406 is common.

[0246] <Master Station Device 11>

[0247] Next, refer to Figure 16 as well as Figure 17 An example of the configuration of the FH receiver 80 and the master station processing unit 90 in the master station device 11 will be described.

[0248] (FH Receiver 80)

[0249] like Figure 16 As illustrated, the FH receiver 80 includes, for example, a receiving unit 801 , an FH control information analyzing unit 802 , an FH reception processing unit 803 , a transmitting unit 804 , a receiving unit 805 , and a measuring unit 806 .

[0250] For example, the receiving unit 801 receives a signal (including a UL signal transmitted by the UE 2 ) transmitted from the FH transmitter 70 of the slave station apparatus 12 to the FH 13 .

[0251] For example, the FH control information analysis unit 802 receives the FH control information (FH transmission mode information #j for each interval #j) determined in the master station processing unit 90 (e.g., the scheduling unit 9023), and outputs the FH transmission mode information #j to the FH reception processing unit 803 and the transmission unit 804.

[0252] For example, the transmission unit 804 transmits FH control information including the FH transmission method information #j to the FH transmitter 70 of the slave station device 12. The FH control information is received by the reception unit 701 of the FH transmitter 70.

[0253] The FH reception processing unit 803 includes, for example, an FH demodulation processing unit 8031 ​​and an FH decoding processing unit 8032 .

[0254] For example, the FH demodulation processing unit 8031 ​​applies a demodulation process corresponding to the modulation process applied to section #j in the FH transmitter 70 to the output signal (UL physical channel signal) of the reception unit 801 based on the FH transmission scheme information #j input from the FH control information analysis unit 802. The signal demodulated by this demodulation process is output to the FH decoding processing unit 8032.

[0255] For example, based on FH transmission scheme information #j, FH decoding processing section 8032 applies decoding processing corresponding to the encoding processing applied to section #j in FH transmitter 70 to the output signal of FH demodulation processing section 8031. This decoding processing decodes the physical channel signal and transmits it to master station processing section 90.

[0256] The receiving unit 805 receives the training signal transmitted by the FH transmitter 70 (for example, the transmitting unit 706 ) of the slave station device 12 and outputs the training signal to the measuring unit 806 .

[0257] For example, the measuring unit 806 measures the reception quality of the training signal input from the receiving unit 805 (in other words, the transmission quality of the FH 13), and outputs the quality measurement result as, for example, FH quality information to the master station processing unit 90 (for example, Figure 17The FH quality information may be transmitted to the master station processing unit 90 via the FH 13 or may be transmitted to the master station processing unit 90 via a communication path different from that of the FH 13.

[0258] In addition, Figures 14 to 17 Although not shown in the figure, the channel quality information sent by UE 2 to UL is output (or transmitted) to the master station processing unit 90 (for example, Figure 17 UE classification unit 9022 in the MAC unit 902).

[0259] In addition, one or both of the receiving unit 805 and the measuring unit 806 may be implemented in the master station device 11 , or may be implemented in a functional block different from the FH receiver 80 in the master station device 11 .

[0260] In addition, the receiving unit 805 can also Figure 3 The receiving unit 305 shown in the example is shared, and the measuring unit 806 can also be used with Figure 3 The FH control information analysis unit 802 may also be used in conjunction with the measurement unit 306. Figure 3 The illustrated 301 is shared.

[0261] (Master Station Processing Unit 90)

[0262] On the other hand, Figure 17 As illustrated, the master station processing unit 90 includes a physical channel processing unit 901 , a MAC unit 902 , an RLC unit 903 , a PDCP unit 904 , and an SDAP unit 905 .

[0263] The UL physical channel signal demodulated and decoded in the FH receiver 80 is input to the physical channel processing unit 901. For example, the physical channel processing unit 901 may apply signal processing such as RE demapping, layer demapping, demodulation, descrambling, and decoding to the input physical channel signal.

[0264] For example, UL user data is demapped from resources of the PUSCH (Physical Uplink Shared Channel), an example of a UL physical data channel. For example, UL control information (also referred to as "UE control information" or "radio control information") is demapped from resources of the PUCCH (Physical Uplink Control Channel), an example of a UL physical control channel.

[0265] For example, the MAC unit 902 generates an RLC PDU from the MAC PDU of the UL signal and outputs it to the RLC unit 903. Furthermore, for example, the MAC unit 902 determines the UE 2 to which the UL communication opportunity is allocated through scheduling and determines the MCS for UL radio transmission. The MCS can also be determined using channel quality information (e.g., CQI) fed back from the UE 2.

[0266] The MAC unit 902 may include, for example, a threshold setting unit 9021 , a UE classification unit 9022 , and a scheduling unit 9023 .

[0267] It can also be understood that these threshold setting unit 9021, UE classification unit 9022 and scheduling unit 9023 have the same Figure 2 The threshold setting unit 2041, UE classification unit 2042 and scheduling unit 2043 have the same functions as those already described.

[0268] Alternatively, the threshold setting unit 9021 , the UE classification unit 9022 , and the scheduling unit 9023 may be shared with the threshold setting unit 2041 , the UE classification unit 2042 , and the scheduling unit 2043 , respectively.

[0269] For example, the threshold setting unit 9021 determines a threshold (or threshold range) for switching the FH transmission mode based on the FH quality information measured by the measurement unit 806 of the FH receiver 80, and outputs information (threshold information) indicating the determined threshold (or threshold range) to the UE classification unit 9022.

[0270] Similar to the first embodiment, for example, the higher the quality indicated by the FH quality information, the threshold (or threshold range) may be determined to be a value (or range) such that the number of UEs 2 applying a high MCS (low FH residual distortion tolerance) increases.

[0271] Conversely, for example, the threshold value (or threshold range) may be determined to be a value (or threshold range) such that the number of UEs 2 applying a low MCS (high FH residual distortion tolerance) increases as the quality indicated by the FH quality information decreases.

[0272] The threshold information determined by the threshold setting unit 9021 and the CQI fed back from UE 2 via the UL signal may also be input to the UE classification unit 9022. For example, based on the threshold information and the CQI, the UE classification unit 9022 classifies UE 2 into a UE group to which a high MCS is applied for UL signals (having low tolerance to FH residual distortion) and a UE group to which a low MCS is applied for UL signals (having high tolerance to FH residual distortion). For example, information related to the UE group (UE classification information) is output to the scheduling unit 9023 along with the CQI of each UE 2. In some cases, the number of UE 2 constituting a UE group may be "1."

[0273] For example, the scheduling unit 9023 determines, from among the UE2s in the classified UE group, the UE 2 to which the UL communication opportunity is to be allocated, based on the UE classification information from the UE classification unit 9022. For example, the scheduling unit 9023 generates an RLC PDU based on the UL signal transmitted by UE 2, to which the UL communication opportunity is allocated, and outputs the RLC PDU to the RLC unit 903.

[0274] Furthermore, for example, the scheduling unit 9023 transmits FH control information including FH transmission scheme information #j for each interval #j to the FH transmitter 70 of the slave station apparatus 12 via, for example, the FH receiver 80. For example, this FH control information (FH transmission scheme information #j) is used to determine the FH transmission scheme when the slave station apparatus 12 transmits a UL signal for a UE group to which a UL communication opportunity is allocated from the FH transmitter 70 to the FH 13.

[0275] For example, the RLC unit 903 performs processing such as error detection and retransmission control based on ARQ on the output of the MAC unit 902 and outputs a PDCP PDU.

[0276] The PDCP unit 904 performs processing such as decoding of encrypted user data and header decompression on the output of the RLC unit 903 , and outputs the SDAP PDU to the SDAP unit 905 .

[0277] For example, the SDAP unit 905 maps the QoS flow to the radio bearer, removes the SDAP header from the output of the PDCP unit 904 , and transmits the result to the upper core network.

[0278] In addition, the UL operation example of the third embodiment can also be understood as equivalent to, for example, the UL operation example of the first embodiment. Figure 6 In the illustrated timing diagram, the flow of the "physical channel signal" is in the reverse direction, and the master station processing unit 20, FH transmitter 30, FH receiver 40, and slave station processing unit 50 are replaced by the operations of the master station processing unit 90, FH receiver 80, FH transmitter 70, and slave station processing unit 60, respectively.

[0279] For example, in Figure 6 In the timing diagram of , the objects of threshold setting based on FH quality information (S604), UE classification based on the threshold and channel quality information (S606), and determination of UE 2 to be given a communication opportunity (S607) are replaced with UL signals.

[0280] As described above, according to the third embodiment, similarly to the first embodiment, regarding the UL, in one time interval #j during FH transmission, UEs 2 having the same or similar (or similar) FH residual distortion tolerance can be scheduled.

[0281] Therefore, in UL-related FH transmission, the FH transmission method applied to the UL can be optimized for each UE group with the same or similar FH residual distortion tolerance, thereby improving UL FH transmission efficiency.

[0282] In the third embodiment, similar to the first embodiment, scheduling for section #j may be performed based not only on the UE classification information but also on information related to the service type of the DL signal to UE 2 transmitted by FH, for example.

[0283] <Implementation Method 4>

[0284] The wireless base station 1 according to the fourth embodiment has the same DL structure as that described in the second embodiment ( Figures 10 to 12 In other words, the fourth embodiment is equivalent to an example of controlling the UL FH transmission method for each frequency interval #j in the UL structure illustrated in the third embodiment, similarly to the second embodiment.

[0285] For example, in the fourth embodiment, the slave station device 12 may also be provided with Figure 14 The slave processing unit 60 shown in the example Figure 15 In the illustrated FH transmitter configuration, for example, an FH transmitter including an FH transmission processing unit 703 (an FH encoding processing unit 7031 and an FH modulation processing unit 7032 ) is provided for each frequency section #j.

[0286] In addition, in the fourth embodiment, the master station device 11 may also be provided with Figure 16 The illustrated FH receiver configuration includes, for example, an FH receiver including an FH reception processing unit 803 (an FH demodulation processing unit 8031 ​​and an FH decoding processing unit 8032 ) for each frequency zone #j.

[0287] In addition, you can also set Figure 17 The illustrated master station processing unit configuration includes a master station processing unit such as a physical channel processing unit 901 for each frequency zone #j, as the master station processing unit included in the master station apparatus 11 in the fourth embodiment.

[0288] With the above configuration, the FH transmission method can be controlled for each frequency section #j (in other words, for each UE group #j classified according to the difference in FH residual distortion tolerance) for the UL signal transmitted from the slave station apparatus 12 to the master station apparatus 11 via the FH 13 .

[0289] Therefore, the FH transmission scheme for UL application can be optimized for each frequency section #j, in other words, for each UE group with the same or similar FH residual distortion tolerance in FH transmission, thereby improving UL FH transmission efficiency.

[0290] Furthermore, in the fourth embodiment, similar to the second embodiment, scheduling is performed for frequency interval #j of the FH resources, enabling UL signals from multiple UE groups to be received in parallel (e.g., at the same timing). Therefore, even if UL signals transmitted from multiple UEs 2 utilizing the same service are allocated to different frequency intervals #j, variations in UL transmission delay between UE groups can be suppressed.

[0291] In addition, similar to the second embodiment, scheduling of frequency interval #j may be performed based not only on UE classification information but also on information related to the service type of the UL signal transmitted by the FH, for example.

[0292] (other)

[0293] Implementation 1 and Implementation 2 may also be implemented in combination. Similarly, Implementation 3 and Implementation 4 may also be implemented in combination. For example, regarding both the time axis and the frequency axis, the allocation of UE groups may also be performed in units of divided FH resources.

[0294] Furthermore, the first embodiment and the second embodiment may be switched (selectively) and implemented. Similarly, the third embodiment and the fourth embodiment may be switched (selectively) and implemented.

[0295] Furthermore, the first embodiment related to the DL and the fourth embodiment related to the UL may be implemented in combination, and the second embodiment related to the DL and the third embodiment related to the UL may be implemented in combination. In other words, regarding the division of FH resources, the use of time interval #j or frequency interval #j may be different for the DL and UL.

[0296] Furthermore, in the first to fourth embodiments described above, the channel quality information (e.g., CQI) used for classification of UE 2 (in other words, threshold determination) may be replaced with information or parameters indicating the wireless propagation environment (or propagation conditions) between UE 2 and wireless base station 1. For example, since the wireless propagation environment may differ depending on factors such as the distance between UE 2 and wireless base station 1 or the presence or absence of obstructions, indicators related to such factors may also be used for classification of UE 2.

[0297] In the first to fourth embodiments described above, at least one of the master processing unit 20 (or 90) and the slave processing unit 50 (or 60) may be configured as a logical slice. Furthermore, at least one of the master device 11 and the slave device 12 may also be configured as a logical slice.

[0298] FH transmission quality can also be measured using, for example, CRC results of DL or UL data, or acknowledgment (Ack / Nack) information based on the CRC results, instead of training signals. In this case, the transmission and reception of signals for FH transmission quality measurement can be eliminated, thereby improving the utilization efficiency of the FH band.

[0299] The DL FH transmitter 30 and the UL FH receiver 80 may be configured as physically separate devices or implemented within the same physically separate device. Furthermore, for example, the FH transmitter 30 and the FH receiver 80 may be integrated as a common FH transmission and reception device or FH communication device for both DL and UL.

[0300] Similarly, in the slave station device 12, the DL FH receiver 40 and the UL FH transmitter 70 may be configured as physically separate devices or implemented within the same physically separate device. Furthermore, for example, the FH receiver 40 and the FH transmitter 70 may be integrated as a common DL and UL FH transmission and reception device or FH communication device.

[0301] Furthermore, the DL slave station processing unit 50 and the UL slave station processing unit 60 may be configured as physically different devices, or may be implemented in the same physically identical device.

[0302] When the expression "...part" used in the first to fourth embodiments above refers to a physical element, it can be replaced with other expressions such as "...circuitry," "...device," "...unit," or "...module." Conversely, when it refers to a logical element, the expression "...part" can be replaced with, for example, the "slice" already described.

[0303] The term "functional split point" used in the above-mentioned first to fourth embodiments is sometimes referred to as "split", "option" or "split option".

[0304] For example, the Common Public Radio Interface: eCPRI Interface Specification V2.0 (2019-05-10) specifies segmentation A to E. Furthermore, as an example of a "segmentation option," the following segmentation options 1 to 8 can be cited, as described in ITU-T G-series Recommendations-Supplement 66 (2018-10).

[0305] (1) Split Option 1: Between RRC (Radio Resource Control) and PDCP

[0306] (2) Split Option 2: Between PDCP and RLC (High-RLC)

[0307] (3) Split Option 3: Between High-RLC and Low-RLC

[0308] (4) Split Option 4: Between RLC (Low-RLC) and MAC (High-MAC)

[0309] (5) Split Option 5: Between High-MAC and Low-MAC

[0310] (6) Split Option 6: Between MAC (Low-MAC) and PHY (High-PHY)

[0311] (7) Split Option 7: Between High-PHY and Low-PHY

[0312] (8) Split Option 8: Between PHY (Low-PHY) and RF

[0313] Regarding the first and third embodiments of dividing FH resources on the time axis, it can also be understood that any of the division options 1 to 8 can be applied. Furthermore, regarding the second and fourth embodiments of dividing FH resources on the frequency axis, it can also be understood that any of the division options 1 to 7 can be applied.

[0314] Furthermore, as shown in the above-mentioned division options 1 to 8, in the first to fourth embodiments, the RLC unit and the MAC unit may be functionally divided (or classified) into a high level unit and a low level unit, respectively.

[0315] In addition, any of the partitions A to E (or the partition options 1 to 8) may be further partitioned (or classified) as, for example, "sub-partitions" (or "sub-options").

[0316] While the first to fourth embodiments illustrate a case where there is only one functional division point (the functional division structure is composed of two: the master station device 11 and the slave station device 12), the number of functional division points may be two or more. For example, multiple base station functional units may be divided and configured into three: a CU, a DU, and a RU (radio unit) using two functional division points.

[0317] In this case, for example, the connection between the CU and the DU corresponds to FH 13. For example, based on the transmission quality information between the CU and the DU, a threshold (or threshold range) for classifying the UE 2 may be determined to group the UE 2 and assign the UE group to section #j.

[0318] The present disclosure can be implemented by software, hardware, or software in collaboration with hardware. The functional blocks used in the description of the above embodiments are partially or entirely implemented as an LSI (Large Scale Integration) as an integrated circuit, and the various processes described in the above embodiments may also be partially or entirely controlled by an LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of a chip containing part or all of the functional blocks. The LSI may also include data input and output. Depending on the degree of integration, the LSI may also be referred to as an "IC (Integrated Circuit)", "System LSI", "Super LSI", or "Ultra LSI".

[0319] Furthermore, integrated circuit implementation is not limited to LSIs and can also be implemented using dedicated circuits, general-purpose processors, or dedicated processors. Alternatively, an FPGA (Field Programmable Gate Array) that can be programmed after LSI fabrication, or a reconfigurable processor that can reconfigure the connections or settings of circuit blocks (cells) within the LSI, can be utilized. The present disclosure can also be implemented as digital processing or analog processing.

[0320] Furthermore, if semiconductor technology or other derivative technologies develop and a technology for integrated circuits that replaces LSIs emerges, it is of course possible to use this technology to integrate functional blocks. There is also the possibility of applying biotechnology, etc.

[0321] <Summary of the present disclosure>

[0322] A master station device involved in a non-limiting embodiment of the present disclosure comprises: a control unit, which determines the resources and transmission method of the fronthaul allocated to the at least one terminal based on the transmission quality information of the fronthaul and the channel quality information of the at least one terminal; and a transmitter, which controls the transmission method of the signal sent to the fronthaul through the resources based on the determined information.

[0323] In the master station device involved in a non-limiting embodiment of the present disclosure, the at least one terminal may also include multiple terminals, and the control unit may determine the resources and transmission method of the fronthaul according to each terminal group obtained by classifying the multiple terminals based on the channel quality information.

[0324] In addition, in the master station device involved in a non-limiting embodiment of the present disclosure, the at least one terminal may also include a first terminal whose channel quality information is less than a threshold, and a second terminal whose channel quality information is greater than the threshold, and the control unit assigns the first transmission mode of the fronthaul transmission mode to the first terminal, and assigns the second transmission mode with higher fault tolerance than the first transmission mode to the second terminal.

[0325] Furthermore, in the master station device according to a non-limiting embodiment of the present disclosure, the control unit may allocate the first terminal to the first resource of the fronthaul and allocate the second terminal to the second resource of the fronthaul.

[0326] Furthermore, in a master station device according to a non-limiting embodiment of the present disclosure, the threshold may be based on the transmission quality information of the fronthaul.

[0327] Furthermore, in the master station device according to a non-limiting embodiment of the present disclosure, each of the first resource and the second resource may be one of resources obtained by dividing the fronthaul resource on at least one of a time axis and a frequency axis.

[0328] Furthermore, the master station device according to a non-limiting embodiment of the present disclosure may include a receiver configured to control a transmission method of a signal received from the fronthaul via the resource based on information determined by the control unit.

[0329] In addition, a non-limiting embodiment of the present disclosure involves a base station comprising: a transmitter for sending a signal to a forward transmission; a receiver for receiving the signal from the forward transmission; a wireless unit for wirelessly transmitting the signal received in the receiver to at least one terminal; and a control unit for controlling the resources of the forward transmission to which the signal is allocated, and the transmission method applied to the signal by the transmitter and the receiver based on the transmission quality information of the forward transmission and the channel quality information of the at least one terminal.

[0330] In the base station involved in a non-limiting embodiment of the present disclosure, it may also be that the at least one terminal includes multiple terminals, and the control unit determines the resources and transmission method of the fronthaul according to each terminal group obtained by classifying the multiple terminals based on the channel quality information.

[0331] In addition, in the base station involved in a non-limiting embodiment of the present disclosure, it may also be that the at least one terminal includes a first terminal whose channel quality information is less than a threshold, and a second terminal whose channel quality information is greater than the threshold, and the control unit assigns a first transmission mode to the first terminal and assigns a second transmission mode with higher fault tolerance than the first transmission mode to the second terminal.

[0332] In addition, in the base station involved in a non-limiting embodiment of the present disclosure, the control unit may also allocate the first terminal to the first resource of the fronthaul and allocate the second terminal to the second resource of the fronthaul.

[0333] In addition, in a base station according to a non-limiting embodiment of the present disclosure, the threshold may also be based on the transmission quality information of the fronthaul.

[0334] In addition, in a base station according to a non-limiting embodiment of the present disclosure, the first resource and the second resource may each be one of the resources obtained by dividing the fronthaul resource on at least one of a time axis and a frequency axis.

[0335] In addition, a non-limiting embodiment of the present disclosure involves a communication control method in which the base station determines the resources and transmission method of the fronthaul allocated to the terminal based on the transmission quality information of the fronthaul and the channel quality information of the terminal, and controls the transmission method of the signal sent to the fronthaul through the resources based on the determined information.

[0336] The present disclosure is suitable for, for example, base stations for wireless communications.

Claims

1. A master station device comprising: a control unit, which determines, based on the fronthaul transmission quality information and the channel quality information of at least one terminal, resources and a transmission mode of the fronthaul allocated to the at least one terminal; and The transmitter controls a transmission method of a signal sent to the fronthaul through the resource based on the determined information, The at least one terminal includes a first terminal whose channel quality information is less than a threshold, and a second terminal whose channel quality information is greater than a threshold. The control unit assigns a first transmission mode among the forward transmission modes to the first terminal, The control unit allocates a second transmission method having higher error tolerance than the first transmission method to the second terminal.

2. The master station device according to claim 1, wherein: The at least one terminal includes a plurality of terminals, The control unit determines the resources and transmission method of the fronthaul for each terminal group obtained by classifying the plurality of terminals based on the channel quality information.

3. The master station device according to claim 1, wherein: The control unit allocates the first terminal to the first resource of the fronthaul and allocates the second terminal to the second resource of the fronthaul.

4. The master station device according to claim 1, wherein: The threshold is based on the transmission quality information of the fronthaul.

5. The master station device according to claim 3, wherein: The first resource and the second resource are each one of resources obtained by dividing the forward transmission resource on at least one of a time axis and a frequency axis.

6. The master station device according to any one of claims 1 to 5, wherein: A receiver is provided for controlling a transmission method of a signal received from the fronthaul via the resource based on the information determined by the control unit.

7. A base station comprising: Transmitter, which sends the signal forward; a receiver, receiving the signal from the fronthaul; a wireless unit that wirelessly transmits the signal received by the receiver to at least one terminal; and a control unit that controls allocation of the fronthaul resources of the signal and a transmission mode applied by the transmitter and the receiver to the signal based on the fronthaul transmission quality information and the channel quality information of the at least one terminal; The at least one terminal includes a first terminal whose channel quality information is less than a threshold, and a second terminal whose channel quality information is greater than a threshold. The control unit allocates a first transmission method to the first terminal, and allocates a second transmission method having higher error tolerance than the first transmission method to the second terminal.

8. The base station according to claim 7, wherein: The at least one terminal includes a plurality of terminals, The control unit determines the resources and transmission method of the fronthaul for each terminal group obtained by classifying the plurality of terminals based on the channel quality information.

9. The base station according to claim 7, wherein: The control unit allocates the first terminal to the first resource of the fronthaul and allocates the second terminal to the second resource of the fronthaul.

10. The base station according to claim 7, wherein: The threshold is based on the transmission quality information of the fronthaul.

11. The base station according to claim 9, wherein: The first resource and the second resource are each one of resources obtained by dividing the forward transmission resource on at least one of a time axis and a frequency axis.

12. A communication control method, The base station determines the resources and transmission mode of the forward transmission allocated to the terminal based on the forward transmission quality information and the channel quality information of the terminal. Based on the determined information, a transmission method of a signal sent to the fronthaul via the resource is controlled, A first transmission mode is allocated to a first terminal whose channel quality information is less than a threshold, and a second transmission mode with higher error tolerance than the first transmission mode is allocated to a second terminal whose channel quality information is greater than the threshold.

Images