WO2021166044A1 - Communication device - Google Patents

Abstract

According to the present invention, an O-RU (120) acquires any subcarrier interval from among a plurality of subcarrier intervals, and determines a parameter set indicating a delay time within the O-RU (120), which is to be applied to the acquired subcarrier interval. The O-RU (120) transmits the determined parameter set to an O-DU (110) provided on a fronthaul. The O-RU (120) can apply a plurality of parameter sets to the same subcarrier interval.

Description

Communication device

The present invention relates to a communication device corresponding to a front hall interface.

The O-RAN Alliance was established with the aim of promoting the openness and intelligentization of wireless access networks (RAN) in the 5G era, and today many businesses / vendors are joining and discussing.

Multiple architectures are being discussed at O-RAN, one of which is the open fronthaul (FH) interface that enables the interconnection of baseband processing and radio between different vendors. ..

Specifically, in O-RAN, O-RAN Distributed Unit (O-DU) and O-RAN Radio Unit (O-RU) are function groups that perform layer 2 functions, baseband signal processing, and radio signal processing. It is defined and discussed as an interface between O-DU and O-RU.

O-DU is a logical node that mainly hosts the wireless link control layer (RLC), medium access control layer (MAC), and PHY-High layer based on the lower layer functional. The O-RU is mainly a logical node that hosts the PHY-Low layer and RF processing based on the low-level functional division.

In O-RAN, since the function sharing points of O-DU / O-RU are placed in the physical (PHY) layer, strict timing accuracy is required. For this reason, FH delay management is performed, and a transmission window and a reception window are used as the method (Non-Patent Document 1).

In addition, based on the fact that multiple subcarrier intervals (SCS) are specified in the 5G (New Radio (NR)) specifications of the 3rd Generation Partnership Project (3GPP), even in O-RAN, the transmission window is displayed for each SCS. It is possible to notify O-DU from O-RU of a set of parameters related to, for example, a delay time due to processing inside the device (Non-Patent Document 2). This is because different SCSs have different symbol lengths.

According to the above-mentioned O-RAN specifications, only one set of the relevant parameters can be notified for the same SCS (for example, 30 kHz).

However, even in the case of the same SCS, the optimum set of parameters related to the transmission window may differ depending on, for example, the difference in the length of the cyclic prefix (CP) provided between the symbols. For this reason, it is not always possible to apply the optimum set of parameters for the transmission window, and there are cases where a compromise must be made, such as applying a set of parameters according to a long CP length.

Therefore, the following disclosure has been made in view of such a situation, and an object of the present invention is to provide a communication device to which more appropriate parameters related to window control can be applied when a front hall (FH) interface is used. ..

One aspect of the present disclosure is a communication device (for example, O-RU120), which acquires the subcarrier interval of any one of a plurality of subcarrier intervals, and is applied to the acquired subcarrier interval. A control unit (transmission window control unit 125) that determines a parameter set indicating a delay time in the communication device, and a transmission unit (parameter) that transmits the parameter set to other communication devices provided on the front hall. A transmitter unit 127) is provided, and the control unit applies a plurality of the parameter sets to the same subcarrier interval.

FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10. FIG. 2 is a diagram showing an example of the internal configuration of the gNB 100 that employs the front hole (FH) interface. FIG. 3 is a diagram showing a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10. FIG. 4 is a diagram showing various signals and delay requirements in the front hole (FH) between O-DU110 and O-RU120. FIG. 5 is a functional block configuration diagram of O-RU120. FIG. 6 is a functional block configuration diagram of the O-DU110. FIG. 7 is an explanatory diagram of delay management between O-DU110 and O-RU120. FIG. 8 is a diagram showing the relationship between the delay-related parameters defined in the O-RANFH specification and the transmission window and the reception window. FIG. 9 is a diagram showing a communication sequence related to control of the transmission window according to the operation example 1. FIG. 10 is a diagram showing a communication sequence related to the control of the reception window according to the operation example 2. FIG. 11 is a diagram showing a communication sequence related to the control of the reception window according to the operation example 3. FIG. 12A is a diagram showing a configuration example (No. 1) of the delay profile. FIG. 12B is a diagram showing a configuration example (No. 2) of the delay profile. FIG. 13 is a diagram showing an example of the hardware configuration of O-DU110 and O-RU120.

Hereinafter, embodiments will be described based on the drawings. The same functions and configurations are designated by the same or similar reference numerals, and the description thereof will be omitted as appropriate.

(1) Overall Schematic Configuration of Wireless Communication System FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment. In the present embodiment, the wireless communication system 10 is a wireless communication system according to 5G New Radio (NR), and is a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN20, and a terminal 200 (hereinafter, User Equipment 200, hereinafter,). UE200) is included.

NG-RAN20 includes a radio base station 100 (hereinafter, gNB100). The specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG.

The NG-RAN20 actually includes multiple NG-RANNodes, specifically gNB (or ng-eNB), and is connected to a core network (5GC, not shown) according to 5G. In addition, NG-RAN20 and 5GC may be simply expressed as a network.

GNB100 is a wireless base station that complies with 5G, and executes wireless communication according to UE200 and 5G. The gNB100 and UE200 include Massive MIMO, which generates a beam with higher directivity by controlling radio signals transmitted from multiple antenna elements, and carrier aggregation (CA), which uses multiple component carriers (CC) in a bundle. It can also support dual connectivity (DC), which communicates simultaneously between the UE and multiple NG-RAN Nodes.

Further, in the present embodiment, the gNB100 adopts the front hole (FH) interface specified by O-RAN.

(2) Front Hall Configuration Figure 2 shows an example of the internal configuration of the gNB100 that employs a front hole (FH) interface. As shown in FIG. 2, the gNB100 includes an O-DU110 (O-RAN Distributed Unit) and an O-RU120 (O-RAN Radio Unit). O-DU110 and O-RU120 are functionally separated within the physical (PHY) layer defined by 3GPP.

O-DU110 may be called an O-RAN distribution unit. The O-DU110 is a logical node that hosts a wireless link control layer (RLC), a medium access control layer (MAC), and a PHY-High layer based on the functions of the lower layers.

O-RU120 may be called an O-RAN radio unit. The O-RU120 is a logical node that hosts the PHY-Low layer and RF processing based on the low-level functional division.

In the present embodiment, the O-DU 110 and the O-RU 120 may form a communication device.

The PHY-High layer is the part of PHY processing on the O-DU110 side of the front hole interface, such as Forward Error Correction (FEC) encoding / decoding, scrambling, and modulation / demodulation.

The PHY-Low layer is the part of PHY processing on the O-RU120 side of the front hole interface, such as Fast Fourier Transform (FFT) / iFFT, digital beam forming, Physical Random Access Channel (PRACH) extraction and filtering.

Between O-DU110 and O-RU120, IQ sample strings of OFDM (Orthogonal Frequency Division Multiplexing) signals in the frequency domain are transmitted and received (in the case of Split Option 7-2x). The IQ sample sequence may be interpreted as a sampling series of in-phase and quadrature components of a complex digital signal.

O-CU is an abbreviation for O-RANControlUnit, which is a logical node that hosts PacketDataConvergenceProtocol (PDCP), RadioResourceControl (RRC), ServiceDataAdaptationProtocol (SDAP), and other control functions. ..

The front hall (FH) may be interpreted as a line between the baseband processing unit of the radio base station (base station device) and the radio device, and an optical fiber or the like is used.

FIG. 3 shows a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10.

As shown in FIG. 3, in the wireless communication system 10, a plurality of subcarrier intervals (SCS) can be used. Specifically, 15, 30, 60, 120 and 240 kHz can be used. The SCS value is not limited to the value shown in FIG. 3, and for example, 480 kHz, 960 kHz, or the like may be used, and as will be described later, a value smaller than 15 kHz is used for a specific channel or the like. It may be used.

If the SCS is different, the symbol (may be called an OFDM symbol) length is also different. The SCS may be called a numerology, and the symbol length may be called a symbol period, a slot period, or the like.

For example, if the SCS is doubled, the symbol length will be shortened to 1/2 (15kHz SCS = 66.6μsec, 30kHzSCS = 33.3μsec). That is, the larger the SCS, the shorter the symbol length (if the 14 symbol / slot configuration is maintained).

Also, the cyclic prefix (CP) length may differ depending on the type of signal (channel), etc. in order to reduce the influence of interference. The cyclic prefix (CP) may be interpreted as a guard time provided between the symbols in order to suppress interference between the preceding and following symbols caused by multipath or the like in the OFDM signal. The signal of this part may be a copy of a part of the latter half of the symbol, and may be called a guard interval.

Table 1 shows the correspondence between SCS and non-PRACH (Physical Random Access Channel) and PRACH.

As shown in Table 1, 3GPP (TS38.211, etc.) specifies PRACH with a long CP length in the case of a narrow SCS. That is, the time it takes for the actual signal processing in the gNB100, specifically the O-DU110 and O-RU120, to begin may vary depending on the type of such signal (which may be referred to as the channel).

The processing time in O-DU110 and O-RU120 also depends on the processing capacity of the hardware of the device.

Table 2 shows an example of CP length for each type of signal (channel).

The CP length of non-PRACH (Non-PRACH) shown in Table 2 is when the number of FFT samples = 4096 and SCS = 30kHz. The non-PRACH is, for example, PUSCH (Physical Uplink Shared Channel), PDSCH (Physical Downlink Shared Channel), or the like.

As shown in Table 2, the CP of PRACH is longer than that of non-PRACH. The PRACH format is specified in TS38.211. In particular, the CP length is extremely long in the case of long format (format = 0 to 3). In this way, signals (channels) with different CP lengths can be defined even in the same SCS.

(3) Various signals and delay requirements between O-DU and O-RU Fig. 4 shows various signals and delay requirements in the front hole (FH) between O-DU110 and O-RU120. As shown in FIG. 4, signals in a plurality of planes are transmitted and received between O-DU110 and O-RU120.

Specifically, U / C / M / S-plane signals are transmitted and received. C-Plane is a protocol for transferring control signals, and U-Plane is a protocol for transferring user data. In addition, S-Plane is a protocol for realizing synchronization between devices. M-Plane is a management plane that handles maintenance and monitoring signals.

More specifically, the U-Plane signal includes a (DL) signal transmitted by the O-RU120 to the radio section and a (UL) signal received from the radio section, and is exchanged by a digital IQ signal. In addition to so-called U-Plane signals (data such as User Datagram Protocol (UDP) and Transmission Control Protocol (TCP)), C-Plane (RRC, Non-Access Stratum (NAS), etc.) defined by 3GPP is also available. , It should be noted that all are U-Planes from the viewpoint of FH.

The C-Plane signal includes signals necessary for various controls related to transmission / reception of U-Plane signals (signals for notifying information related to radio resource mapping and beamforming of the corresponding U-Plane). It should be noted that the signal is completely different from the C-Plane (RRC, NAS, etc.) defined in 3GPP.

The M-Plane signal includes the signal necessary for the management of O-DU110 / O-RU120. For example, it is a signal for notifying various hardware (HW) capabilities of O-RU120 to O-RU120 and notifying various setting values from O-DU110 to O-RU120.

The S-Plane signal is a signal required for synchronous control between O-DU110 / O-RU120.

As shown in FIG. 4, the output point (which may be called the sender) toward O-RU120 of O-DU110 (which may be called the downward direction) is at R1 and O-DU110 of O-RU120. The directed (may be called ascending) output point may be defined as R3.

Further, the input point of the signal from the O-DU110 (which may be called the receiver) in the O-RU120 may be defined as R2, and the input point of the signal from the O-RU120 in the O-DU110 may be defined as R4. In addition, the downlink (DL) from O-DU110 to O-RU120 may be defined as T12 and the uplink (DL) from O-RU120 to O-DU110 may be defined as T34.

The latency for O-DU110 and O-RU120 may be defined as shown in Table 3.

As shown in Table 3, T1a and T2a are the delay times in the DL direction, and T3a and T4a are the delay times in the UL direction. Further, each delay time may be set to a minimum value (Minimum) and a maximum value (Maximum) in consideration of the switching time in the network constituting the FH between O-DU110 and O-RU120. Ra shown in FIG. 4 is a reference point for the delay time measurement and corresponds to the antenna of the O-RU.

(4) Functional Block Configuration of Wireless Communication System Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of O-DU110 and O-RU120 will be described. For convenience, the functional block configuration of O-RU120 will be described first.

(4.1) O-RU120
FIG. 5 is a functional block configuration diagram of O-RU120. As shown in FIG. 5, the O-RU120 includes a communication unit 121, a CP length / channel type acquisition unit 123, a transmission window control unit 125, and a parameter transmission unit 127.

Communication unit 121 executes communication with O-DU110. Specifically, the communication unit 121 is connected to the FH line and can transmit and receive signals of various planes shown in FIG.

The CP length / channel type acquisition unit 123 can acquire the CP length applied to the signal (which may be a channel) transmitted / received via the FH. In addition, the CP length / channel type acquisition unit 123 can acquire the type of channel transmitted / received via FH. As described above, the channel includes, but is not limited to, PRACH, PUSCH, PDSCH, and the like.

As mentioned above, the CP length may differ depending on the channel type, and even for the same channel, it may differ depending on the format. The CP length / channel type acquisition unit 123 may acquire the CP length and / or the channel type autonomously, or may acquire the CP length and / or the channel type by being explicitly or implicitly notified from the O-DU 110.

The transmission window control unit 125 controls the transmission window of the signal transmitted to the O-DU 110. Specifically, the transmission window control unit 125 controls the transmission window indicating the time range in which the signal can be transmitted, based on the delay management of the FH.

In particular, in the present embodiment, the transmission window control unit 125 acquires any of the subcarrier intervals (SCS) among the plurality of subcarrier intervals (SCS). That is, the transmission window control unit 125 acquires the SCS of the signal applied to the signal transmitted / received via the FH. In the present embodiment, the transmission window control unit 125 constitutes a control unit.

The transmission window control unit 125 can determine a parameter set indicating the delay time in the O-RU120 (communication device) applied to the acquired SCS. Specifically, the transmission window control unit 125 can determine Ta3_min and Ta3_max, which are delay times (which may be read as processing time) from Ra to R3 (see FIG. 4). Ta3_min and Ta3_max may be interpreted as measurement results from reception by the O-RU antenna to output by the O-RU port (R3). Further, the parameter set including Ta3_min and Ta3_max may be called a delay profile or the like.

Thus, the delay time may include the minimum and maximum values of the time from the reception of the signal at the antenna of the O-RU120 to the output of the signal to the O-DU110 (another communication device), but not necessarily both. Is not required.

The transmission window control unit 125 can apply a plurality of parameter sets to the same SCS. For example, a parameter set (delay profile) including Ta3_min and Ta3_max with different values can be associated with the SCS of 30 kHz.

Further, the transmission window control unit 125 may apply a plurality of parameter sets according to the CP length of the signal transmitted and received by the O-RU 120. That is, the plurality of parameter sets associated with the same SCS may be based on the CP length of the signal transmitted and received by the O-RU120.

Further, the transmission window control unit 125 may apply a plurality of parameter sets according to the type of signal (which may be read as a channel) transmitted / received by the O-RU120. That is, the plurality of parameter sets associated with the same SCS may be based on the type of signal (channel) transmitted / received by the O-RU120 (for example, PRACH, PUSCH, PDSCH, etc.).

The parameter transmission unit 127 transmits the parameter set determined by the transmission window control unit 125 to another communication device provided on the FH, specifically, the O-DU110. In the present embodiment, the parameter transmission unit 127 constitutes a transmission unit.

The parameter transmission unit 127 may transmit the parameter set (delay profile) to the O-DU110 after setting the M-Plane. However, the method of transmitting the parameter set is not necessarily limited to the M-Plane, and may be transmitted as a signal of another Plane.

(4.2) O-DU110
FIG. 6 is a functional block configuration diagram of the O-DU110. As shown in FIG. 6, the O-DU 110 includes a communication unit 111, a CP length / channel type acquisition unit 113, a parameter reception unit 115, and a reception window control unit 117.

Communication unit 111 executes communication with O-RU120. Specifically, the communication unit 111 is connected to the FH line and can transmit and receive signals of various planes shown in FIG.

The CP length / channel type acquisition unit 113 can acquire the CP length applied to the signal (which may be a channel) transmitted / received via the FH. Further, the CP length / channel type acquisition unit 113 can acquire the type of the channel transmitted / received via the FH. The function of the CP length / channel type acquisition unit 113 may be the same as that of the CP length / channel type acquisition unit 123 of the O-RU120 described above.

The parameter receiving unit 115 can receive the parameter set transmitted from the O-RU120. Specifically, the parameter receiving unit 115 may receive the parameter set (delay profile) from the O-RU 120 after setting the M-Plane. However, as described above, the method of transmitting and receiving the parameter set is not necessarily limited to the M-Plane, and may be transmitted as a signal of another Plane.

The reception window control unit 117 controls the reception window of the signal transmitted to the O-DU 110. Specifically, the reception window control unit 117 controls the reception window control unit 117 that indicates the time range in which the signal can be received, based on the delay management of the FH.

In particular, in the present embodiment, the reception window control unit 117 has a plurality of values having different values depending on the CP length and the channel type even when the SCS of the signal applied to the signal transmitted and received via the FH is the same. You can set the receive window.

That is, when the reception window control unit 117 transmits and receives a plurality of types of signals (or channels) having the same SCS but different CP lengths via the FH, the reception window control unit 117 has each CP length (or signal, channel). You may set the receive window.

Alternatively, when the reception window control unit 117 transmits and receives a plurality of types of signals (or channels) having the same SCS but different CP lengths via the FH, among all the signals (or channels), You may set the worst receiving window. The worst receiving window may be interpreted as the largest receiving window.

(5) Operation of Wireless Communication System Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to the control of the transmission window and the reception window between O-DU110 and O-RU120 will be described.

(5.1) Delay Management in Front Hall FIG. 7 is an explanatory diagram of delay management between O-DU110 and O-RU120. As described above, since the function sharing points of O-DU110 / O-RU120 are placed in the physical (PHY) layer, strict timing accuracy is required. For this reason, FH delay management is performed, and a transmission window and a reception window are used as the method.

FIG. 7 shows an example of a UL signal. The DL signal is basically the same as the UL signal. In the following, the UL signal will be described as an example.

Propagation delay fluctuates depending on the FH configuration, so it is necessary to consider the maximum and minimum values of the delay. In FIG. 7, it is assumed that the FH signal satisfies the following conditions in order to facilitate the illustration.

-Transmit at the edge of the transmission window-Maximum FH propagation delay As shown in FIG. 7, the O-RU120 transmits an FH signal during the period of the transmission window. The O-DU110 also receives the FH signal during the reception window. It is necessary to manage the delay in FH so that these two points are satisfied. If these two points do not hold, communication of the FH signal may be impossible.

Note that the delay management here shall include both of the following.

-Management of FH delay itself-Management of size of transmission window and reception window In addition, delay management is performed based on the reception timing of the radio signal from UE200 in O-RU120.

FIG. 8 shows the relationship between the delay-related parameters specified in the O-RANFH specifications and the transmission window and the reception window.

The O-RAN FH specification defines parameters that represent both ends of the send window and receive window. The O-DU110 manages the delay by determining its own transmission window (in the case of DL) and reception window (in the case of UL) according to the O-RU120.

Specifically, O-RU120 notifies O-DU110 of Ta3_max and Ta3_min as its own ability values.

O-DU110 determines its own Ta4_max, Ta4_min based on the preset values of T34_max and T34_min and the notified Ta3_max and Ta3_min. At this time, as shown in FIG. 8, the following conditions must be satisfied.

・ Ta4_min <= Ta3_min + T34_min
・ Ta4_max> = T34_max + Ta3_max
According to such delay management, the O-RU120 only operates based on its own ability value, and the delay management (control) is performed by the O-DU110. As a result, even when the O-RU120 is stationed in various ways, there is an advantage that delay management needs to be considered only on the O-DU110 side.

(5.2) Operation example Next, an operation example of controlling the transmission window and the reception window between O-DU110 and O-RU120 will be described.

As described above, in the wireless communication system 10, even if the SCS of the signal applied to the signal transmitted / received via the FH is the same, a plurality of transmission windows having different values according to the CP length (and signal type). And / or the receive window can be set.

(5.2.1) Operation example 1
In this operation example, even if the SCS of the signal applied to the signal transmitted / received via FH is the same, the O-RU120 is not one for the SCS but the CP length (and signal type). A parameter set (delay profile) with different delay times may be sent to the O-DU110.

FIG. 9 shows a communication sequence related to the control of the transmission window according to the operation example 1. As shown in FIG. 9, O-DU110 and O-RU120 execute the M-Plane connection establishment procedure (S10). The procedure of M-Plane connection establishment is a procedure for setting M-Plane.

O-RU120 acquires the SCS of the signal applied to the signal transmitted and received via FH (S20). Specifically, the O-RU120 can acquire the SCS value (for example, 30 kHz) or identification information applied to the signal. When there are a plurality of types of the signals having different SCSs, the O-RU120 may acquire the SCSs for each signal. Also, the operation of S20 may be executed before S10.

O-RU120 acquires the CP length of the signal to which the same SCS is applied or the type of the signal (S30). As mentioned above, even if the SCS is the same, the CP length can vary depending on the type of signal (or channel) (see Tables 1 and 2). Therefore, the appropriate Ta3_min and Ta3_max values may differ. As a result, the appropriate size of the transmit window between O-DU110 and O-RU120 may also differ.

O-RU120 determines the delay profile for the signal to which the SCS and CP length is applied based on the acquired SCS and CP length (or signal type) (S40). Specifically, the O-RU120 determines the delay time parameter set (Ta3_min, Ta3_max) based on the acquired SCS and CP length (or signal type).

O-RU120 sends a delay profile including the determined Ta3_min and Ta3_max to O-DU110 (S50). The delay profile may include parameters other than Ta3_min and Ta3_max, as will be described later.

O-DU110 executes window settings based on the received delay profile (S60). Specifically, the O-DU110 recognizes the transmission window of the O-RU120 (see FIG. 8 and the like) based on the received Ta3_min and Ta3_max, and sets the size of the reception window of the O-DU110.

O-DU110 and O-RU120 execute communication via FH after setting the window (S70).

(5.2.2) Operation example 2
In this operation example, O-DU110 is not one for the same SCS of the signal applied to the signal transmitted and received via FH, but the delay time with different values according to the CP length (and signal type). Multiple windows may be set corresponding to the parameter set (delay profile) of. Hereinafter, the parts different from the operation example 1 will be mainly described.

FIG. 10 shows a communication sequence related to the control of the reception window according to the operation example 2. As shown in FIG. 10, the operation of S110 is the same as that of S10 in operation example 1.

O-DU110 sets the reception window based on the CP length (x) of the signal transmitted and received via FH (S120). Specifically, the O-DU110 sets the size of the reception window (see FIG. 8 and the like) based on the CP length (x).

More specifically, the O-DU110 may determine Ta4_min, Ta4_max based on the CP length (x), and determine the size of the receiving window based on the determined Ta4_min, Ta4_max values.

After setting the window, O-DU110 and O-RU120 execute communication via FH for the signal (S130).

After that, the O-DU110 sets the reception window based on the CP length (y) of other signals transmitted and received via the FH (S140). Specifically, the O-DU110 sets the size of the reception window based on the CP length (y).

O-DU110 and O-RU120 execute communication via FH for the other signals after setting the window (S150).

In this way, the O-DU110 differs for each CP length (or signal (channel) type) regardless of whether or not the same SCS is applied to a plurality of types of signals transmitted and received via the FH. You may set the receive window.

(5.2.3) Operation example 3
In this operation example, O-DU110 is not one for the same SCS of the signal applied to the signal transmitted and received via FH, but the delay time with different values according to the CP length (and signal type). A shared window corresponding to the parameter set (delay profile) of may be set. Hereinafter, the parts different from the operation example 2 will be mainly described.

FIG. 11 shows a communication sequence related to the control of the reception window according to the operation example 3. As shown in FIG. 11, the operation of S110 is the same as that of S110 of operation example 2.

The O-DU110 acquires the CP length (or signal type, the same applies hereinafter) for each of multiple signals transmitted and received via FH (S220).

O-DU110 sets the reception window based on the acquired multiple CP lengths (S230). Specifically, the O-DU110 may determine the Ta4_min, Ta4_max shared by the plurality of CP lengths, and determine the size of the shared reception window based on the determined Ta4_min, Ta4_max values.

The shared reception window may reflect the worst Ta4_min, Ta4_max among the plurality of CP lengths, or may reflect the average value of a plurality of Ta4_min, Ta4_max according to the CP length. As described above, the worst may be interpreted as the reception window having the largest size.

O-DU110 and O-RU120 execute communication via FH for the plurality of signals after setting the window (S240).

(5.2.4) Configuration Example of Delay Profile FIG. 12A and FIG. 12B show a configuration example of the delay profile according to the present embodiment. Specifically, FIGS. 12A and 12B show a configuration example of the delay profile of O-RU. The delay profile (ro ru-delay-profile) is specified in D.5.2 o-ran-delay-management.yang Module of ORAN-WG4.MP.0-v02.00.00.

As shown in FIG. 12A, in the present embodiment, a plurality of ro ru-delay-profiles (ro ru-delay-profile (1) and ro ru-delay-profile (2) in the figure, etc.) are used for the same SCS. ) Can be associated and set.

The ro ru-delay-profile (1) and ro ru-delay-profile (2) may be associated with different CP lengths (or signal (channel) types).

Alternatively, as shown in FIG. 12B, a plurality of parameters of the same type may be included in one roru-delay-profile. For example, ro ta3-min (1) and ro ta3-min (2) may be included in the ro ru-delay-profile. ro ta3-min (1) and ro ta3-min (2) may be associated with different CP lengths (or signal (channel) types).

(6) Action / Effect According to the above-described embodiment, the following action / effect can be obtained. Specifically, the O-RU120 acquires one of the SCSs applied to the signals transmitted and received via the FH among the plurality of SCSs, and the O-RU120 is applied to the acquired SCSs. The parameter set (Ta3_min, Ta3_max) indicating the delay time of can be determined. Further, the O-RU120 can transmit the determined parameter set to the O-DU110 provided on the FH.

Therefore, even in the case of the same SCS, for example, the optimum parameter set for the transmission window may differ depending on the difference in CP length, but such a case can also be dealt with. As a result, it is possible to always apply the optimum parameter set for the transmission window, and it is possible to apply more appropriate parameters for window control.

As described above, signals (channels) having different CP lengths may be defined even in the same SCS, and in particular, there is a large difference in CP length between PRACH and non-PRACH such as PUSCH and PDSCH ( See Table 2). Furthermore, there may be a large difference in CP length between different preamble formats in PRACH (see Table 2).

Therefore, if the window size is simply determined according to the longest CP length, the delay time (maximum delay time) based on the long CP length is assumed even for the signal (channel) that can be processed by the shorter delay time. It becomes necessary to set the window, which causes a problem that a delay longer than the originally required processing delay time may occur. In addition, the communication devices constituting the FH are required to have excessive hardware capability, which poses a problem in implementation. According to O-DU110 and O-RU120 according to the present embodiment, such a problem can be avoided.

In this embodiment, assuming the same SCS, a plurality of parameter sets according to the CP length of the signal transmitted / received by the O-RU120 may be applied, or a plurality of parameters may be applied according to the type of signal (or channel) transmitted / received by the O-RU120. Parameter set of can be applied. Therefore, even if the same SCS has different optimum parameter sets, more appropriate parameters related to window control can be applied.

In the present embodiment, the delay time may include the minimum value and the maximum value (Ta3_min, Ta3_max) of the time from the reception of the signal at the antenna of the O-RU120 (Ra) to the output of the signal to the O-DU110. .. Therefore, a more appropriate size of the transmission window can be determined based on the minimum and maximum values.

(7) Other Embodiments Although the embodiments have been described above, it is obvious to those skilled in the art that various modifications and improvements are possible without being limited to the description of the embodiments.

For example, in the above-described embodiment, an example of a parameter set in the UL direction including Ta3_min and Ta3_max has been described, but the same operation may be applied to the parameter set (Ta2) in the DL direction, and the O-DU 110 is DL. The directional parameter set may be determined.

Further, in the above-described embodiment, an example in which a plurality of delay profiles (parameter sets) are associated with each other in the same SCS has been described, but in particular, in the case of O-DU110, it is not necessary to be aware of whether or not the SCSs are the same. , A reception window for each of a plurality of different CP lengths may be set, or a reception window shared by the plurality of different CP lengths may be set.

Further, a configuration using a device for bundling O-RUs (FHM: Fronthaul Multiplexing) (FHM configuration) and a configuration for continuously connecting O-RUs (cascade configuration), a so-called Shared Cell configuration, may be applied.

Further, in the above-described embodiment, the configuration of the FH according to the specifications of the O-RAN has been described, but the FH does not necessarily have to comply with the specifications of the O-RAN. For example, at least a portion of O-DU110 and O-RU120 may comply with the FH specifications specified in 3GPP.

The block configuration diagrams (FIGS. 5 and 6) used in the description of the above-described embodiment show blocks for functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't. For example, a functional block (constituent unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). As described above, the method of realizing each of them is not particularly limited.

Further, the above-mentioned O-DU110 and O-RU120 (the device) may function as a computer that processes the wireless communication method of the present disclosure. FIG. 13 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 13, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the device may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

Each functional block of the device (see FIGS. 5 and 6) is realized by any hardware element of the computer device or a combination of the hardware elements.

Further, for each function in the device, the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and controls the communication by the communication device 1004, or the memory. It is realized by controlling at least one of reading and writing of data in 1002 and storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.

Further, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. Further, the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. Storage 1003 may be referred to as auxiliary storage. The recording medium described above may be, for example, a database, server or other suitable medium containing at least one of memory 1002 and storage 1003.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.

The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.

The input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

In addition, each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information. Bus 1007 may be configured using a single bus or may be configured using different buses for each device.

Further, the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA). The hardware may implement some or all of each functional block. For example, processor 1001 may be implemented using at least one of these hardware.

Further, the notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI), upper layer signaling (eg, RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)). (MIB), System Information Block (SIB)), other signals or a combination thereof. RRC signaling may also be referred to as an RRC message, for example, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.

Each aspect / embodiment described in the present disclosure includes LongTermEvolution (LTE), LTE-Advanced (LTE-A), SUPER3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system ( 5G), FutureRadioAccess (FRA), NewRadio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UltraMobileBroadband (UMB), IEEE802.11 (Wi-Fi (registered trademark)) , IEEE802.16 (WiMAX®), IEEE802.20, Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize appropriate systems and at least one of the next generation systems extended based on them. It may be applied to one. In addition, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

In some cases, the specific operation performed by the base station in the present disclosure may be performed by its upper node. In a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal are performed by the base station and other network nodes other than the base station (for example, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.). Although the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information and signals (information, etc.) can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information can be overwritten, updated, or added. The output information may be deleted. The input information may be transmitted to another device.

The determination may be made by a value represented by 1 bit (0 or 1), by a true / false value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

Note that the terms explained in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message. Further, the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not it.

In this disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "cell group" Terms such as "carrier" and "component carrier" can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)). Communication services can also be provided by Head: RRH).

The term "cell" or "sector" refers to a base station that provides communication services in this coverage, and part or all of the coverage area of at least one of the base station subsystems.

In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" may be used interchangeably. ..

Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.

Further, the base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the mobile station may have the functions of the base station. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the upstream channel, the downstream channel, and the like may be read as a side channel.

Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the base station may have the functions of the mobile station.
The radio frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe.
Subframes may further consist of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.

The numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel. Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transmission / reception. At least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like may be indicated.

The slot may be composed of one or more symbols (Orthogonal Frequency Division Multiple Access (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. Slots may be in numerology-based time units.

The slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be referred to as a sub slot. A minislot may consist of a smaller number of symbols than the slot. PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.

The wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.

For example, one subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as TTI, and one slot or one minislot may be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. It may be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

The TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like. TTIs shorter than normal TTIs may also be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) may be read as less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

The resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. The number of subcarriers contained in RB may be the same regardless of numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs include a physical resource block (Physical RB: PRB), a sub-carrier group (Sub-Carrier Group: SCG), a resource element group (Resource Element Group: REG), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (ResourceElement: RE). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common RBs (common resource blocks) for a neurology in a carrier. good. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as wireless frames, subframes, slots, minislots and symbols are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, and the number of RBs. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. , Electromagnetic energies with wavelengths in the microwave and light (both visible and invisible) regions, etc., can be considered to be "connected" or "coupled" to each other.

The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applicable standard.

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

The "means" in the configuration of each of the above devices may be replaced with a "part", a "circuit", a "device", or the like.

Any reference to elements using designations such as "first", "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as comprehensive as the term "comprising". Is intended. Moreover, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are plural.

The terms "determining" and "determining" used in this disclosure may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). (For example, searching in a table, database or another data structure), ascertaining may be regarded as "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in memory) may be regarded as "judgment" or "decision". In addition, "judgment" and "decision" mean that the things such as solving, selecting, choosing, establishing, and comparing are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision". Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure may be implemented as an amendment or modification without departing from the purpose and scope of the present disclosure, which is determined by the description of the scope of claims. Therefore, the description of the present disclosure is for the purpose of exemplary explanation and does not have any limiting meaning to the present disclosure.

10 Radio communication system 20 NG-RAN
100 gNB
110 O-DU
111 Communication unit 113 CP length / channel type acquisition unit 115 Parameter reception 117 Reception window control unit 120 O-RU
121 Communication unit 123 CP length / channel type acquisition unit 125 Transmission window control unit 127 Parameter transmission unit 200 UE
1001 Processor 1002 Memory 1003 Storage 1004 Communication Device 1005 Input Device 1006 Output Device 1007 Bus

Claims (4)

1. It ’s a communication device,
   A control unit that acquires one of the subcarrier intervals among the plurality of subcarrier intervals and determines a parameter set indicating a delay time in the communication device applied to the acquired subcarrier interval.
   It includes a transmitter that transmits the parameter set to other communication devices provided on the front hall.
   The control unit is a communication device that applies a plurality of the parameter sets to the same subcarrier interval.
2. The communication device according to claim 1, wherein the control unit applies a plurality of the parameter sets according to the length of cyclic prefixes of signals transmitted and received by the communication device.
3. The communication device according to claim 1, wherein the control unit applies a plurality of the parameter sets according to the types of signals transmitted and received by the communication device.
4. The communication device according to claim 1, wherein the delay time includes a minimum value and a maximum value of a time from reception of a signal by the antenna of the communication device to output of the signal to the other communication device.

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