CN115104365A - Communication device - Google Patents

Abstract

The O-RU (120) acquires an arbitrary subcarrier spacing among a plurality of subcarrier spacings, and determines a parameter set indicating a delay time in the O-RU (120) to be applied to the acquired subcarrier spacing. The O-RU (120) transmits the decided parameter set to the O-DU (110) placed on the preamble. The O-RU (120) is capable of applying multiple parameter sets to the same subcarrier spacing.

Description

Communication device

Technical Field

The invention relates to a communication device supporting a fronthaul interface (fronthaul interface).

Background

With the aim of promoting the development and intelligence of Radio Access Networks (RANs) in the 5G era, an O-RAN Alliance (O-RAN Alliance) is established, and currently, a large number of operators/providers are joined and discussed.

Among them, an open fronthaul interface (FH) interface that realizes interconnection between a baseband processing unit and a wireless unit among different vendors is discussed.

Specifically, in the O-RAN, as a functional group for performing layer 2 functions, baseband signal processing, and Radio signal processing, an O-RAN Distributed Unit (O-RAN Distributed Unit: O-DU) and an O-RAN Radio Unit (O-RAN Radio Unit: O-RU) are defined, and discussed as an interface between the O-DU and the O-RU.

The O-DU is a logical node of a radio link control layer (RLC), a medium access control layer (MAC), and a PHY-High layer that mainly carries (host) a low layer function (lower layer function). The O-RU is a logical node of the PHY-Low layer and RF processing that mainly carries Low layer based functional partitioning.

In the O-RAN, strict timing accuracy is required because a function sharing point of the O-DU/O-RU is provided in a Physical (PHY) layer. Therefore, the FH delay management is performed, and as this method, a transmission window and a reception window are used (non-patent document 1).

In addition, in view of the fact that a plurality of subcarrier spacings (SCS) are specified in the specification of 5G (New Radio (NR)) of the third Generation Partnership Project (3 GPP), the O-RAN can also notify a set of parameters related to a transmission window, for example, a delay time due to processing inside the apparatus, to the O-DU from the O-RU for each SCS (non-patent document 2). This is because the symbol length is different in the case where the SCS is different.

Documents of the prior art

Non-patent document

Non-patent document 1: ORAN-WG4.CUS.0-v 02.00', O-RAN frontaul Working Group, Control, User and Synchronization Plane Specification, O-RAN Alliance, 8 months in 2019

Non-patent document 2: ORAN-WG4.MP.0-v02.00.00", O-RAN Alliance Working Group 4, Management Plane Specification, O-RAN Alliance, 7 months in 2019

Disclosure of Invention

According to the O-RAN specification described above, only one set of such parameters may be signaled for the same SCS (e.g., 30 kHz).

However, even in the case of the same SCS, the optimal set of parameters related to the transmission window may be different due to, for example, a difference in length of a Cyclic Prefix (CP) provided between symbols. Therefore, it is not always possible to apply an optimal set of parameters for the transmission window, and sometimes a set of parameters matching a long CP length has to be applied with a compromise.

Accordingly, the following disclosure has been made in view of such circumstances, and an object thereof is to provide a communication apparatus capable of applying a parameter related to more appropriate window control when using a Forward (FH) interface.

One aspect of the present disclosure provides a communication apparatus (e.g., O-RU 120) including: a control unit (transmission window control unit 125) that acquires any one of a plurality of subcarrier intervals and determines a parameter set indicating a delay time in the communication device to be applied to the acquired subcarrier interval; and a transmission unit (parameter transmission unit 127) that transmits the parameter set to another communication apparatus set in the preamble, wherein the control unit applies a plurality of the parameter sets to the same subcarrier interval.

Drawings

Fig. 1 is a schematic configuration diagram of the entire wireless communication system 10.

Fig. 2 is a diagram showing an example of the internal configuration of the gNB100 that employs a Forward (FH) interface.

Fig. 3 is a diagram showing an example of the structure of a radio frame, a subframe, and a slot used in the wireless communication system 10.

Fig. 4 is a diagram showing various signals in a forward pass (FH) between O-DUs 110-O-RUs 120 and delay requirements.

FIG. 5 is a functional block diagram of the O-RU 120.

FIG. 6 is a functional block diagram of the O-DU 110.

Fig. 7 is a diagram illustrating delay management between O-DU 110 to O-RU 120.

Fig. 8 is a diagram illustrating the association of latency-related parameters specified in the O-ranch specification with transmit and receive windows.

Fig. 9 is a diagram showing a communication sequence related to control of a transmission window according to operation example 1.

Fig. 10 is a diagram showing a communication sequence related to control of a reception window according to operation example 2.

Fig. 11 is a diagram showing a communication sequence related to control of a reception window in operation example 3.

Fig. 12A is a diagram illustrating a configuration example (1 thereof) of the delay characteristic (delay profile).

Fig. 12B is a diagram showing a configuration example of the delay characteristic (2 thereof).

Fig. 13 shows an example of the hardware configuration of the O-DU 110 and the O-RU 120.

Detailed Description

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

(1) General overall structure of wireless communication system

Fig. 1 is a schematic configuration diagram of the entire radio communication system 10 according to the present embodiment. In the present embodiment, the Radio communication system 10 is a Radio communication system conforming to a New Radio (NR) of 5G, and includes a Next Generation Radio Access Network 20 (hereinafter, referred to as NG-RAN 20) and a terminal 200(User Equipment 200, hereinafter, referred to as UE 200).

The NG-RAN 20 includes a radio base station 100 (hereinafter referred to as a gNB 100). In addition, the specific configuration of the wireless communication system 10 including the number of the gnbs and the UEs is not limited to the example shown in fig. 1.

The NG-RAN 20 actually includes a plurality of NG-RAN nodes (NG-RAN nodes), specifically, a gNB (or NG-eNB), connected to a core network (5GC, not shown) compliant with 5G. In addition, the NG-RANs 20 and 5GC may be simply expressed as "networks".

The gNB100 is a radio base station compliant with 5G, and performs radio communication compliant with 5G with the UE 200. The gNB100 and the UE200 can support massive mimo (massive mimo) in which beams having higher directivity are generated by controlling radio signals transmitted from a plurality of antenna elements, Carrier Aggregation (CA) in which a plurality of Component Carriers (CCs) are bundled, Dual Connectivity (DC) in which communication is simultaneously performed between the UE and a plurality of NG-RAN nodes, respectively, and the like.

In the present embodiment, the gNB100 employs a forward-link (FH) interface defined by the O-RAN.

(2) Structure of Fronthaul (frontlaul)

Fig. 2 shows an example of the internal configuration of the gNB100 using the Forward (FH) interface. As shown in FIG. 2, the gNB100 includes O-DUs 110(O-RAN Distributed Unit: O-RAN Distributed Unit) and O-RUs 120(O-RAN Radio Unit: O-RAN Wireless Unit). The O-DUs 110 and O-RUs 120 are functionally separated (Function split) within the Physical (PHY) layer specified by the 3 GPP.

The O-DU 110 may also be referred to as an O-RAN distribution unit. The O-DU 110 is a logical node of a radio link control layer (RLC), a medium access control layer (MAC), and a PHY-High layer that carry (host) low-layer based functions.

The O-RU120 may also be referred to as an O-RAN radio unit. The O-RU120 is a logical node of the PHY-Low layer and RF processing that carries (host) Low layer based functional partitioning.

In the present embodiment, the O-DU 110 and the O-RU120 may constitute a communication apparatus.

The PHY-High layer is a part of PHY processing of a Forward interface on the O-DU 110 side, such as Forward Error Correction (FEC) encoding/decoding, scrambling, modulation/demodulation, and the like.

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

Between the O-DU 110 and the O-RU120, IQ sample sequences of Frequency domain OFDM (Orthogonal Frequency Division Multiplexing) signals are transmitted and received (Split Option 7-2 x). In addition, the IQ sample sequence can be interpreted as a sequence of samples of the In-phase (In-phase) and Quadrature (Quadrature) components of a complex digital signal.

The O-CU is a short for O-RAN Control Unit, and is a logical node for carrying (host) Packet Data Convergence Protocol (PDCP), Radio Resource Control (RRC), Service Data Adaptation Protocol (SDAP), and other Control functions.

The Forward (FH) may be interpreted as a link between a baseband processing unit of a radio base station (base station apparatus) and the radio apparatus, and an optical fiber or the like may be used.

Fig. 3 shows an example of the structure of a radio 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 spacings (SCS) can be used. Specifically, 15, 30, 60, 120, and 240kHz can be used. The SCS value is not limited to the value shown in fig. 3, and may be, for example, 480kHz or 960kHz, or may be, for example, a value smaller than 15kHz for a specific channel, as described below.

In the case where the SCS is different, the symbol (which may also be referred to as OFDM symbol) length is also different. The SCS may be referred to as a parameter set, and the symbol length may be referred to as a symbol period or a slot period.

For example, if the SCS is 2 times, the symbol length is shortened to 1/2(15kHzSCS 66.6 μ sec, 30kHzSCS 33.3 μ sec). That is, the larger the SCS, the shorter the symbol length (in the case of maintaining the structure of 14 symbols/slot).

In addition, the Cyclic Prefix (CP) length may be different depending on the type of signal (channel) or the like, for example, due to mitigation of the influence of interference or the like. The Cyclic Prefix (CP) can be interpreted as a guard time (guard time) set between symbols in an OFDM signal in order to suppress interference between preceding and following symbols caused by multipath or the like. This part of the signal may be obtained by copying a part of the latter half of the symbol, and may also be referred to as a guard interval (guard interval).

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

[ Table 1]

SCS	Non-PRACH	PRACH (preamble code format)
			1.25kHz	N/A	Long(0.1.2)
5kHz	N/A	Long(3)
			15kHz	YES	Short(all)
30kHz	YES	Short(all)
			60kHz	YES	Short(all)
120kHz	YES	Short(all)
			240kHz	YES	N/A

As shown in table 1, in 3GPP (TS38.211, etc.), PRACH with a long CP length is specified for a narrow SCS. That is, the time until the actual signal processing in the gNB100 (specifically, the O-DU 110 and the O-RU 120) is started may be different depending on the type of such a signal (may also be referred to as a channel).

In addition, the processing time within the O-DU 110 and O-RU120 also depends on the processing power of the hardware of the device.

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

[ Table 2]

The CP length of the Non-PRACH (Non-PRACH) shown in table 2 is a length in the case where the number of FFT samples is 4096 and the SCS is 30 kHz. The non-PRACH refers to, for example, a PUSCH (Physical Uplink Shared Channel), a 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 format of PRACH is specified in TS 38.211. In particular, the CP length in the case of a long format (format 0 to 3) is very long. Thus, signals (channels) having different CP lengths can be defined even in the same SCS.

(3) Various signals between O-DU-O-RU and delay requirements

Figure 4 illustrates various signals in a forward pass (FH) between O-DUs 110-O-RUs 120 and latency requirements. As shown in fig. 4, signals in a plurality of planes are transceived between the O-DUs 110 to 120.

Specifically, the U/C/M/S-plane signals are transmitted and received. The C-Plane is a protocol for forwarding control signals and the U-Plane is a protocol for forwarding user data. Further, S-Plane is a protocol for implementing Synchronization (Synchronization) between devices. The M-Plane is the management Plane that handles maintenance monitoring signals.

More specifically, the U-Plane signal includes a (DL) signal transmitted from the O-RU120 to the radio zone and a (UL) signal received from the radio zone, and is alternated by a digital IQ signal (digital IQ signal). Note that, 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)) defined in 3GPP is also entirely U-Plane in terms of FH.

The C-Plane signal includes signals (signals for notifying information on radio resource mapping and beamforming of the corresponding U-Plane) necessary for performing various controls related to transmission and reception of the U-Plane signal. In addition, it should be noted that C-Plane (RRC, NAS, etc.) defined in 3GPP refers to a completely different signal.

The M-Plane signal contains signals necessary for management of the O-DU 110/O-RU 120. For example, are signals for notifying various Hardware (HW) capabilities of the O-RU120 from the O-RU120 or notifying various setting values to the O-RU120 from the O-DU 110.

The S-Plane signal is a signal required for synchronization control between the O-DU 110/O-RU 120.

As shown in fig. 4, an output point (also referred to as a sender) of the O-DU 110 toward the O-RU120 (also referred to as a downstream direction) is defined as R1, and an output point of the O-RU120 toward the O-DU 110 (also referred to as an upstream direction) is defined as R3.

Further, an input point of a signal from the O-DU 110 in the O-RU120, which may be referred to as a receiver (receiver), may be defined as R2, and an input point of a signal from the O-RU120 in the O-DU 110 may be defined as R4. In addition, a Downlink (DL) from the O-DU 110 to the O-RU120 may be defined as T12, and an uplink (DL) from the O-RU120 to the O-DU 110 may be defined as T34.

The delay times (Latency) associated with the O-DU 110 and the O-RU120 may be as defined in Table 3.

[ Table 3]

As shown in table 3, T1a and T2a are delay times in the DL direction, and T3a and T4a are delay times in the UL direction. In addition, each delay time may be set to be a Minimum value (Minimum) and a Maximum value (Maximum) in consideration of a switching time and the like in a network constituting FH between the O-DU 110 to the O-RU 120. Ra shown in fig. 4 is a reference point of this delay time measurement, corresponding to the antenna of the O-RU.

(4) Functional block structure of wireless communication system

Next, a functional block configuration of the radio communication system 10 will be described. Specifically, the functional block structures of the O-DU 110 and the O-RU120 are explained. For ease of explanation, the functional block structure of O-RU120 will be described.

(4.1)O-RU 120

FIG. 5 is a functional block diagram of the O-RU 120. 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.

The communication section 121 performs communication with the O-DU 110. Specifically, the communication unit 121 is connected to the FH line and can transmit and receive signals on various surfaces as shown in fig. 4.

The CP length/channel type acquisition unit 123 can acquire a CP length applied to a signal (or a channel) transmitted and received via the FH. The CP length/channel type acquisition unit 123 can acquire the type of channel to be transmitted and received via the FH. As described above, the channels include the PRACH, PUSCH, PDSCH, and the like, but are not limited to these channels.

As described above, the CP length may be different depending on the channel type, and may be different depending on the format even in the same channel. The CP length/channel type acquisition unit 123 may autonomously acquire the CP length and/or the channel type, or may acquire the CP length and/or the channel type by explicit or implicit notification 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 a transmission window indicating a time range in which the signal can be transmitted, based on the delay management of FH.

In particular, in the present embodiment, the transmission window control unit 125 acquires an arbitrary subcarrier interval among a plurality of subcarrier intervals (SCS). That is, the transmission window control unit 125 acquires SCS of signals applied to signals transmitted and received via 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 a delay time in the O-RU120 (communication apparatus) applied to the acquired SCS. Specifically, the transmission window controller 125 can determine Ta3_ min and Ta3_ max, which are delay times (which may be replaced by processing times) from Ra to R3 (see fig. 4). Ta3_ min, Ta3_ max may be interpreted as measurements from the O-RU antenna received into the output in the O-RU port (R3). Further, a parameter set including Ta3_ min, Ta3_ max may be referred to as a delay characteristic or the like.

Thus, the delay time may include the minimum value and the maximum value of the time from when the O-RU120 receives a signal via the antenna to when the signal is output to the O-DU 110 (other communication device), but it does not necessarily include both.

The transmission window control unit 125 can apply a plurality of parameter sets to the same SCS. For example, a parameter set (delay characteristic) including Ta3_ min and Ta3_ max having different values can be associated with the SCS at 30 kHz.

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

The transmission window control unit 125 may apply a plurality of parameter sets corresponding to the types of signals (which may be replaced with channels) 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 kind of signal (channel) transceived by the O-RU120 (e.g., PRACH, PUSCH, PDSCH, etc.).

The parameter transmission unit 127 transmits the parameter set determined by the transmission window control unit 125 to another communication apparatus (specifically, O-DU 110) installed in the FH. In the present embodiment, the parameter transmitting unit 127 constitutes a transmitting unit.

The parameter transmitting unit 127 may transmit the parameter set (delay characteristics) to the O-DU 110 after the M-Plane setting. 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-DU 110

FIG. 6 is a block diagram of the function blocks of O-DU 110. 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.

The communication section 111 performs communication with the O-RU 120. Specifically, the communication unit 111 is connected to the FH line and can transmit and receive signals on various surfaces as shown in fig. 4.

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

The parameter receiving section 115 can receive the parameter set transmitted from the O-RU 120. Specifically, the parameter receiving unit 115 can receive the parameter set (delay characteristics) from the O-RU120 after the M-Plane setting. However, as described above, the transmission and reception method of 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 indicating a time range in which the signal can be received, based on the delay management by FH.

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

That is, when transmitting and receiving a plurality of types of signals (or channels) having the same SCS but different CP lengths via the FH, the reception window controller 117 may set the reception window for each CP length (or signal or channel).

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

(5) Actions of a wireless communication system

Next, an operation of the radio communication system 10 will be described. Specifically, operations related to control of the transmission window and the reception window between the O-DUs 110 to 120 will be described.

(5.1) delay management in Forwarding

Fig. 7 is an explanatory diagram of delay management between O-DUs 110 to O-RUs 120. As described above, the function sharing point of O-DU/O-RU is set in the Physical (PHY) layer, and thus strict timing accuracy is required. Therefore, the FH delay management is performed, and as this method, a transmission window and a reception window are used.

An example of a UL signal is shown in fig. 7. The DL signal is basically the same as the UL signal. The following description will be made by taking UL signals as an example.

Since the propagation delay fluctuates depending on the configuration of FH, it is necessary to consider the maximum and minimum values of the delay. In fig. 7, for ease of illustration, it is assumed that the FH signal satisfies the following condition.

Transmitting at the end of the transmission window

Propagation delay maximization of FH

As shown in fig. 7, the O-RU120 transmits an FH signal during a transmission window. Furthermore, O-DU 110 receives FH signals during the receive window. Delay management in FH is required to establish these two points. If these two points are not satisfied, communication of the FH signal may not be possible.

The delay management here includes both the following.

Management of FH delay itself

Management of the size of the send and receive windows

In addition, delay management is performed with reference to the reception timing of the radio signal from the UE200 in the O-RU 120.

Fig. 8 illustrates the association between latency-related parameters specified in the O-ranch specification and the transmit and receive windows.

In the O-RAN FH specification, parameters indicating both ends of the transmission window and the reception window are defined. The O-DU 110 determines its own transmission window (DL case) and reception window (UL case) in correspondence with the O-RU120, and performs delay management.

Specifically, the O-RU120 notifies Ta3_ max and Ta3_ min as its own capability value to the O-DU 110.

The O-DU 110 determines its Ta4_ max and Ta4_ min based on the values of T34_ max and T34_ min set in advance and the notified Ta3_ max and Ta3_ min. In this case, as shown in fig. 8, the following conditions need to be satisfied.

·Ta4_min<＝Ta3_min+T34_min

·Ta4_max>＝T34_max+Ta3_max

According to this delay management, the O-RU120 operates only according to its own capability value, and delay management (control) is performed by the O-DU 110. This provides an advantage that even when the O-RU120 is variously equipped, delay management can be considered only on the O-DU 110 side.

(5.2) operation example

Next, an example of control operation of the transmission window and the reception window between the O-DU 110 to the O-RU120 will be described.

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

(5.2.1) operation example 1

In this operation example, even when the SCS of the signal applied to the signal transmitted and received via the FH is the same, the O-RU120 can transmit the parameter set (delay characteristic) of the delay time having the different value corresponding to the CP length (or the signal type) to the O-DU 110, instead of one, to the SCS.

Fig. 9 shows a communication sequence related to control of a transmission window according to operation example 1. As shown in fig. 9, the O-DU 110 and the O-RU120 perform an M-Plane connection establishment (M-Plane connection establishment) process (S10). The process of M-Plane connection estimation is a process for setting M-Plane.

The O-RU120 acquires SCS of a signal applied to a signal transmitted and received via the FH (S20). Specifically, the O-RU120 can obtain a value (for example, 30kHz) of SCS applied in the signal or identification information. In addition, in the case where the signal has multiple categories with different SCS, the O-RU120 may obtain the SCS for each signal. Further, the action of S20 may also be performed before S10.

The O-RU120 obtains the CP length of the signal or the kind of the signal to which the same SCS is applied (S30). As described above, even when the SCS is the same, the CP length may be different depending on the type of signal (or channel) (see table 1 and table 2). Therefore, the appropriate values of Ta3_ min and Ta3_ max may be different. As a result, the appropriate transmission window size may vary between the O-DU 110 to the O-RU 120.

The O-RU120 determines the delay characteristics for applying the SCS and CP length signals based on the obtained SCS and CP length (or signal type) (S40). Specifically, the O-RU120 determines the parameter sets (Ta3_ min and Ta3_ max) of the delay time based on the obtained SCS and CP length (or signal type).

The O-RU120 transmits the delay characteristics including the determined Ta3_ min, Ta3_ max to the O-DU 110 (S50). As described below, the delay characteristics may include parameters other than Ta3_ min and Ta3_ max.

The O-DU 110 performs window setting according to the received delay characteristics (S60). Specifically, the O-DU 110 identifies the transmission window of the O-RU120 (refer to FIG. 8, etc.) from the received Ta3_ min, Ta3_ max, and sets the size of the reception window of the O-DU 110.

The O-DU 110 and the O-RU120 perform communication via FH after window setting (S70).

(5.2.2) operation example 2

In this operation example, the O-DU 110 may set a plurality of windows corresponding to a parameter set (delay characteristics) of delay times having different values corresponding to the CP length (or signal type) for the same SCS of signals applied to signals transmitted and received via the FH, instead of one. The following mainly describes the differences from operation example 1.

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

The O-DU 110 sets a reception window according to the CP length (x) of the signal transmitted and received via the FH (S120). Specifically, the O-DU 110 sets the size of a reception window (see fig. 8 and the like) according to the CP length (x).

More specifically, the O-DU 110 may determine Ta4_ min and Ta4_ max according to the CP length (x), and determine the size of the receiving window according to the determined values of Ta4_ min and Ta4_ max.

The O-DU 110 and the O-RU120 perform communication via FH for the signal after the window setting (S130).

Then, the O-DU 110 sets a reception window according to the CP length (y) of the other signals transmitted and received via the FH (S140). Specifically, the O-DU 110 sets the size of the reception window according to the CP length (y).

The O-DU 110 and the O-RU120 perform communication via FH for the other signals after the window setting (S150).

Thus, O-DU 110 can set different reception windows for a plurality of types of signals transmitted and received via FH, for each CP length (or signal (channel) type), regardless of whether the same SCS is applied or not.

(5.2.3) operation example 3

In this operation example, the O-DU 110 may set a common window corresponding to a parameter set (delay characteristic) of a delay time having a different value corresponding to the CP length (or signal type) for the same SCS of signals applied to signals transmitted and received via the FH, instead of one. The following mainly describes the differences from operation example 2.

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

The O-DU 110 acquires each CP length (or signal type, the same as below) for a plurality of signals transmitted and received via the FH (S220).

The O-DU 110 sets a reception window based on the acquired CP lengths (S230). Specifically, the O-DU 110 may determine Ta4_ min and Ta4_ max common to the CP lengths, and determine the size of the common receive window according to the determined values of Ta4_ min and Ta4_ max.

The common reception window may reflect the worst Ta4_ min and Ta4_ max among the CP lengths, or may reflect an average value of Ta4_ min and Ta4_ max corresponding to the CP lengths. In addition, as described above, the worst may be interpreted as the largest size of the receive window.

The O-DU 110 and the O-RU120 perform communication via FH for the plurality of signals after the window setting (S240).

(5.2.4) construction example of delay characteristics

Fig. 12A and 12B show an example of the delay characteristic configuration according to the present embodiment. Specifically, fig. 12A and 12B show a configuration example of the delay characteristic of the O-RU. The delay characteristics (ro ru-delay-profile) are defined in D.5.2o-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-profile (1) and ro ru-delay-profile (2) in the figure) can be set in association with each other for the same SCS.

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

Alternatively, as shown in fig. 12B, a plurality of parameters of the same kind may be contained in one ro ru-delay-profile. For example, in the ro ru-delay-profile may be contained ro ta3-min (1) and ro ta3-min (2). The ro ta3-min (1) and ro ta3-min (2) can be associated with different CP lengths (or signal (channel) classes).

(6) Action and Effect

According to the above embodiment, the following operational effects can be obtained. Specifically, the O-RU120 can acquire an arbitrary SCS applied to a signal transmitted and received via the FH, from among the plurality of SCS's, and determine parameter sets (Ta3_ min and Ta3_ max) indicating the delay time in the O-RU120 applied to the acquired SCS. Furthermore, the O-RU120 can transmit the decided parameter set to the O-DU 110 set at FH.

Therefore, even in the case of the same SCS, the optimal parameter set related to the transmission window may be different due to, for example, a difference in CP length, but this case can be handled. This makes it possible to always apply an optimal parameter set for a transmission window, and to apply a parameter for more appropriate window control.

As described above, signals (channels) having different CP lengths may be defined in the same SCS, and in particular, the CP length may have a large difference in PRACH and non-PRACH such as PUSCH and PDSCH (see table 2). In addition, 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 in accordance with the longest CP length, the following problems occur: that is, even for a signal (channel) that can be processed with a shorter delay time, a window in which a delay time (longest delay time) corresponding to a longer CP length is assumed needs to be set, and a delay equal to or longer than the originally required processing delay time may occur. Further, the communication device constituting the FH is requested to have an excessive hardware capability, which causes a problem in mounting. According to the O-DU 110 and O-RU120 relating to the present embodiment, these problems can be avoided.

In the present embodiment, on the premise of the same SCS, it is possible to apply a plurality of parameter sets corresponding to the CP length of the signal transmitted and received by the O-RU120, or to apply a plurality of parameter sets corresponding to the kind of the signal (or channel) transmitted and received by the O-RU 120. Therefore, even in the case where the optimal parameter set is different in the same SCS, the parameters related to more appropriate 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 when the O-RU120 receives the signal (Ra) through the antenna to when the signal is output to the O-DU 110. Therefore, a more appropriate size of the transmission window can be determined based on the minimum value and the maximum value.

(7) Other embodiments

The embodiments have been described above, but it is obvious to those skilled in the art that various modifications and improvements can be made without being limited to the embodiments.

For example, although the above embodiment describes an example of the UL-direction parameter set including Ta3_ min and Ta3_ max, the same operation may be applied to the DL-direction parameter set (Ta2), and the O-DU 110 may determine the DL-direction parameter set.

In the above-described embodiment, an example in which a plurality of delay characteristics (parameter sets) are associated with the same SCS has been described, but in particular, in the case of the O-DU 110, it is possible to set a reception window for each of a plurality of different CP lengths or a reception window common to the plurality of different CP lengths without identifying whether or not the same SCS is used.

Further, a structure using an O-RU-bound apparatus (FHM: frontaul Multiplexing) (FHM structure), and a structure in which O-RUs are connected in series (cascade structure), so-called Shared Cell (FHM structure) may be applied.

Further, in the above-described embodiments, the structure of the FH following the specification of the O-RAN is explained, but the FH may not necessarily follow the specification of the O-RAN. For example, at least a portion of O-DU 110 and O-RU120 may comply with the FH specifications specified in 3 GPP.

The block diagrams (fig. 5 and 6) used in the description of the above embodiments show blocks in units of functions. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one device that is physically or logically combined, or may be implemented by two or more devices that are physically or logically separated and that are directly or indirectly (for example, wired or wireless) connected to each other and that use these multiple devices. The functional blocks may also be implemented by combining software with the above-described device or devices.

The functions include judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, viewing, broadcasting (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), and the like, but are not limited thereto. For example, a function block (a configuration unit) that functions transmission is referred to as a transmission unit (transmitter) or a transmitter (transmitter). In short, as described above, the method of implementation is not particularly limited.

The O-DU 110 and the O-RU120 (the apparatuses) described above may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 13 is a diagram showing an example of the hardware configuration of the apparatus. As shown in fig. 13, the apparatus may be a computer apparatus including a processor 1001, a memory 1002(memory), a storage 1003(storage), a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, a bus 1007, and the like.

In the following description, the term "device" may be replaced with "circuit", "device", "unit", and the like. The hardware configuration of the apparatus may include one or more of each illustrated apparatus, or may be configured not to include a part of the apparatus.

Each functional block (see fig. 5 and 6) of the apparatus is realized by an arbitrary hardware element of the computer apparatus or a combination of the hardware elements.

Furthermore, the functions in the apparatus are realized by: when predetermined software (program) is read into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation to control communication of the communication device 1004 or at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be constituted by a Central Processing Unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.

Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes according to the read-out program. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. While the various processes described above have been described as being executed by one processor 1001, the various processes described above may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may also be mounted by more than one chip. In addition, the program may be transmitted from a network via a telecommunication line.

The Memory 1002 is a computer-readable recording medium, and may be configured by at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a Random Access Memory (RAM), and the like. Memory 1002 may also be referred to as registers, cache, main memory (primary storage), etc. The memory 1002 can store a program (program code), a software module, and the like that can execute the method according to one embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and may be constituted by at least one of an optical disk such as a CD-rom (compact Disc rom), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact Disc, a digital versatile Disc, a Blu-ray (registered trademark) Disc, a smart card, a flash memory (for example, a card, a stick, a Key drive), a Floppy (registered trademark) Disc, a magnetic stripe, and the like.

The communication device 1004 is hardware (a transmitting/receiving device) for performing communication between computers via at least one of a wired network and a wireless network, and may be referred to as a network device, a network controller, a network card, a communication module, or the like.

Communication apparatus 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, for example, in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a key, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrally configured (for example, a touch panel).

The processor 1001 and the memory 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses for each device.

The apparatus may include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), or the like, and a part or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

Note that the information is not limited to the form and embodiment described in the present disclosure, and may be notified by other methods. For example, the Information may be notified by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast Information (Master Information Block (MIB)), System Information Block (SIB)), other signals, or a combination thereof).

The forms/embodiments described in this disclosure may also be applied to Long Term Evolution (LTE), LTE-a (LTE-Advanced), SUPER 3G, IMT-Advanced, fourth generation mobile communication system (4th generation mobile communication system: 4G), fifth generation mobile communication system (5th generation mobile communication system: 5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-wide band), Bluetooth (registered trademark), a system using other appropriate systems, and a next generation system extended accordingly. Further, a plurality of systems (for example, a combination of 5G and at least one of LTE and LTE-a) may be combined and applied.

For the processing procedures, timings, flows, and the like of the respective forms/embodiments described in the present disclosure, the order may be changed without contradiction. For example, for the methods described in this disclosure, elements of the various steps are suggested using an exemplary order, but are not limited to the particular order suggested.

In the present disclosure, a specific operation performed by a base station is sometimes performed by its upper node (upper node) depending on the situation. In a network including one or more network nodes (network nodes) having a base station, it is obvious that various operations to be performed for communication with a terminal can be performed by the base station and at least one of other network nodes (for example, MME, S-GW, or the like, but not limited thereto) other than the base station. In the above, the case where there is one network node other than the base station is exemplified, but the other network node may be a combination of a plurality of other network nodes (e.g., MME and S-GW).

Information and signals (information and the like) can be output from an upper layer (or a lower layer) to a lower layer (or an upper layer). Or may be input or output via a plurality of network nodes.

The inputted or outputted information may be stored in a specific location (for example, a memory) or may be managed using a management table. The information input or output may be rewritten, updated, or appended. The output information may also be deleted. The entered information may also be sent to other devices.

The determination may be made by a value (0 or 1) represented by 1 bit, may be made by a Boolean value (true or false), or may be made by comparison of numerical values (for example, comparison with a predetermined value).

The respective forms/embodiments described in the present disclosure may be used alone or in combination, and may be switched depending on execution. Note that the notification of the predetermined information is not limited to be performed explicitly (for example, notification of "X") but may be performed implicitly (for example, notification of the predetermined information is not performed).

Software, whether referred to as software, firmware, middleware, microcode, hardware description languages, or by other names, should be construed broadly to mean commands, command sets, code segments, program code, programs (routines), subroutines, software modules, applications, software packages, routines, subroutines (subroutines), objects, executables, threads of execution, procedures, functions, and the like.

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

Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions (commands), information, signals, bits, symbols (symbols), chips (chips), etc., that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Further, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). Further, the signal may also be a message. In addition, a Component Carrier (CC) may be referred to as a Carrier frequency, a cell, a frequency Carrier, or the like.

The terms "system" and "network" as used in this disclosure may be used interchangeably.

Further, information, parameters, and the like described in the present disclosure may be expressed using absolute values, may be expressed using relative values to predetermined values, and may be expressed using other corresponding information. For example, the radio resource may also be indicated by an index.

The names used for the above parameters are in no way limiting. Further, the numerical expressions and the like using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by appropriate names, and thus the various names assigned to these various channels and information elements are not limiting in any respect.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station", "NodeB", "enodeb (enb)", "gnnodeb (gnb)", "access point", "transmission point", "reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like may be used interchangeably. A base station may also be referred to as a macrocell, a smallcell, a femtocell, a picocell, or the like.

A base station can accommodate one or more (e.g., 3) cells (also referred to as sectors). When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH) for indoor use).

The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that performs communication service within the coverage area.

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

For a mobile station, those skilled in the art will sometimes also refer to it by the following terms: a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent (user agent), a mobile client, a client, or some other suitable terminology.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving body may be a vehicle (e.g., an automobile, an airplane, etc.), may be a moving body that moves in an unmanned manner (e.g., an unmanned aerial vehicle, an autonomous automobile, etc.), or may be a robot (manned or unmanned). At least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

In addition, the base station in the present disclosure may be replaced with a mobile station (user terminal, the same applies hereinafter). For example, the embodiments and embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between a plurality of mobile stations (for example, a configuration may be referred to as D2D (Device-to-Device) or V2X (Vehicle-to-all system).

Likewise, the mobile station in the present disclosure may be replaced with a base station. In this case, the base station may have a function of the mobile station.

A radio frame may be composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as subframes.

A subframe may also be composed of one or more slots in the time domain. The subframe may be a fixed time length (e.g., 1ms) independent of a parameter set (numerology).

The parameter set may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may represent, for example, at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a Transmission Time Interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transceiver in a frequency domain, a specific windowing process performed by the transceiver in a Time domain, and the like.

A slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. The time slot may be a time unit based on a parameter set.

The time slot may contain a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. The PDSCH (or PUSCH) transmitted in a unit of time greater than the mini-slot may be referred to as PDSCH (or PUSCH) mapping type (type) a. The PDSCH (or PUSCH) transmitted using the mini-slot may be referred to as PDSCH (or PUSCH) mapping type (type) B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot and symbol may be referred to by corresponding other designations, respectively.

For example, 1 subframe may be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may be referred to as TTIs, and 1 slot or 1 mini-slot may be referred to as a TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1-13 symbols), or may be a period longer than 1 ms. Note that the unit indicating TTI may be a slot, a mini-slot, or the like, instead of a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidths, transmission powers, and the like that can be used by each user terminal) to each user terminal in units of TTIs. In addition, the definition of TTI is not limited thereto.

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

In addition, in a case where a 1-slot or 1-mini-slot is referred to as a TTI, more than one TTI (i.e., more than one slot or more than one mini-slot) may constitute a minimum time unit for scheduling. Further, the number of slots (the number of mini-slots) constituting the minimum time unit of the schedule can be controlled.

TTIs having a time length of 1ms are also referred to as normal TTIs (TTIs in LTE rel.8-12), normal TTIs (normal TTIs), long TTIs (long TTIs), normal subframes (normal subframes), long (long) subframes, slots, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI (short TTI), a partial TTI, a shortened subframe, a short (short) subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, for a long TTI (long TTI) (e.g., normal TTI, subframe, etc.), a TTI having a time length exceeding 1ms may be substituted, and for a short TTI (short TTI) (e.g., shortened TTI, etc.), a TTI having a TTI length smaller than that of the long TTI (long TTI) and having a TTI length of 1ms or more may be substituted.

A Resource Block (RB) is a resource allocation unit of time and frequency domains, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set, for example, may be 12. The number of subcarriers included in the RB may also be decided according to the parameter set.

Further, the time domain of the RB may contain one or more symbols, and may be 1 slot, 1 mini-slot, 1 subframe, or 1TTI in length. The 1TTI, 1 subframe, and the like may be respectively configured by one or more resource blocks.

In addition, one or more RBs may be referred to as Physical Resource blocks (Physical RBs: PRBs), Sub-Carrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, and the like.

In addition, a Resource block may be composed of one or more Resource Elements (REs). For example, 1RE may be 1 subcarrier and 1 symbol of a radio resource region.

The Bandwidth Part (BWP) (also called fractional Bandwidth, etc.) represents a subset of consecutive common rbs (common resource blocks) for a certain set of parameters in a certain carrier. Here, the common RB may be determined by an index of an RB with reference to a common reference point of the carrier. PRBs are defined in a certain BWP and are numbered within that BWP.

The BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). One or more BWPs may be set for a UE within 1 carrier.

At least one of the set BWPs may be active (active), and it is not assumed that the UE transmits and receives a predetermined signal/channel outside the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may be replaced with "BWP".

The above-described structures of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and other configurations may be variously changed.

The term "connected" or "coupled" or any variation of these terms is intended to mean that two or more elements are directly or indirectly connected or coupled to each other, and may include one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination of these. For example, "connection" may be replaced with "Access". As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other by using at least one of one or more wires, cables, and printed electrical connections, and by using electromagnetic energy having wavelengths in the radio frequency domain, the microwave domain, and the optical (both visible and invisible) domain, or the like, as some non-limiting and non-inclusive examples.

The Reference Signal may be referred to as Reference Signal (RS) for short, or as Pilot (Pilot) depending on the applied standard.

As used in this disclosure, a statement "according to" is not intended to mean "according only" unless explicitly stated otherwise. In other words, the expression "according to" means both "according to" and "at least according to".

The "unit" in the configuration of each device described above may be replaced with a "section", "circuit", "device", or the like.

Any reference to an element using the designations "first", "second", etc. used in this disclosure is not intended to limit the number or order of such elements. These designations are used in this disclosure as a convenient way to distinguish between two or more elements. Thus, references to first and second elements do not imply that only two elements are possible here or that in any case the first element must precede the second element.

Where the disclosure uses the terms "including", "comprising" and variations thereof, such terms are intended to be inclusive in the same manner as the term "comprising". Also, the term "or" used in the present disclosure means not exclusive or.

In the present disclosure, where the articles are added by translation, for example, as in the case of a, an, and the like in the english language, the present disclosure also includes the case where the noun following the articles is plural.

Terms such as "determining" and "determining" used in the present disclosure may include various operations. The terms "determination" and "decision" may include, for example, determining that an item has been determined (judging), calculated (calculating), processed (processing), derived (deriving), investigated (investigating), searched (looking up) (for example, searching in a table, a database, or another data structure), or confirmed (ascertaining) as an item having been determined or decided. The "determination" and "decision" may include a matter in which reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), and access (e.g., access to data in the memory) are performed, and the like. The "judgment" and "decision" may include matters regarding the solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), comparison (comparing), and the like as the "judgment" and "decision". That is, "judgment" and "determination" may include "judgment" and "determination" of any item of action. The "determination (decision)" may be replaced by "assumption (associating)", "expectation (expecting)", "consideration (associating)", or the like.

In the present disclosure, the phrase "a and B are different" may also mean "a and B are different from each other". The term "A and B are different from C" may be used. The terms "separate" and "join" are also interpreted in the same manner as "different".

While the present disclosure has been described in detail, it should be apparent to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and alterations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the disclosure is intended to be illustrative, and not limiting.

Description of reference numerals:

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 send window control part

127 parameter transmitting part

200 UE

1001 processor

1002 internal memory

1003 memory

1004 communication device

1005 input device

1006 output device

1007 bus.

Claims (4)

1. A communication apparatus, wherein the communication apparatus has:

a control unit that acquires any one of a plurality of subcarrier intervals, and determines a parameter set indicating a delay time in the communication apparatus to be applied to the acquired subcarrier interval; and

a transmission unit that transmits the parameter set to another communication apparatus set in the preamble,

the control unit applies a plurality of the parameter sets to the same subcarrier interval.

2. The communication device of claim 1,

the control unit applies a plurality of the parameter sets corresponding to a length of a cyclic prefix of a signal transmitted and received by the communication device.

3. The communication device of claim 1,

the control unit applies a plurality of parameter sets corresponding to types of signals transmitted and received by the communication device.

4. The communication device of claim 1,

the delay time includes a minimum value and a maximum value of time from when the communication device receives a signal through an antenna to when the signal is output to the other communication device.

Images