WO2022153512A1 - Wireless communication node - Google Patents

Abstract

When adjusting a downlink transmission timing, and an uplink reception timing in a wireless communication node 100B, a wireless communication node 100A determines, by a symbol-level: the adjustment value of the reception timing based on timing information used for determining the uplink transmission timing; or an offset value from the timing information. The wireless communication node 100A transmits the determined adjustment value or offset value to the wireless communication node 100B.

Description

Wireless communication node

The present invention relates to a wireless communication node that sets wireless access and a wireless backhaul.

The 3rd Generation Partnership Project (3GPP) has specified Long Term Evolution (LTE), and aims to further speed up LTE with LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced), and 5G New Radio (NR). ) Or the successor system of LTE called Next Generation (NG) is specified.

For example, in the NR radio access network (RAN), integrated access and backhaul that integrate wireless access to terminals (User Equipment, UE) and wireless backhaul between wireless communication nodes such as wireless base stations (gNB). (IAB) is being studied (see Non-Patent Document 1).

In IAB, IAB nodes have MobileTermination (MT), which is a function for connecting to a parent node (may be called an IAB donor), and Distributed Unit (DU), which is a function for connecting to a child node or UE. ) And.

In 3GPP Release 16, wireless access and wireless backhaul are premised on half-duplex communication (Half-duplex) and time division multiplexing (TDM). In Release 17 and later, the application of spatial division multiplexing (SDM) and frequency division multiplexing (FDM) is being studied.

Non-Patent Document 1 defines seven cases regarding the alignment of transmission timing between the parent node and the IAB node. For example, as a premise, adjustment of the downlink (DL) transmission timing between the IAB node and the IAB donor (Case # 1), and adjustment of the DL and uplink (UL) reception timing within the IAB node (Case # 3). , And the combination of adjusting the DL transmission timing of Case # 1 and the reception timing of UL of Case # 3 (Case # 7) is specified.

In case # 1, in order to match the DL transmission timing in the DU of each node, the IAB node uses the calculation formula (TA / 2 + T_delta) to delay the propagation of the path (0) with the parent node (T). It is agreed that _{propagation_0} ) is calculated and the transmission timing is offset.

Here, TA is the value of Timing Advance for determining the UE transmission timing specified in 3GPP Release 15, and T_delta is determined in consideration of the switching time from reception to transmission of the parent node. Ru.

3GPP TR 38.874 V16.0.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Study on Integrated Access and Backhaul; (Release 16), 3GPP, December 2018

As described above, in Case # 7, in addition to adjusting the DL transmission timing of Case # 1, specifically the IAB node and the IAB donor DU, Case # 3, specifically, the DL and UL reception timing. Coordination within the IAB node needs to be achieved.

In other words, when supporting Case # 7, it is necessary to match the DL and UL reception timings of the IAB nodes in addition to the DL transmission timings between the gNB and IAB nodes.

Therefore, the present invention has been made in view of such a situation, and in Integrated Access and Backhaul (IAB), the transmission timing and the reception timing of the Distributed Unit (DU) and the Mobile Termination (MT) are surely matched. The purpose is to provide a wireless communication node that can be used.

One aspect of the present disclosure is a case where the wireless communication node (for example, wireless communication node 100A) adjusts the downlink transmission timing and the uplink reception timing in the lower node (for example, wireless communication node 100B). The control unit (control unit 140) that determines the adjustment value of the reception timing based on the timing information (TA) used for determining the transmission timing of the uplink or the offset value from the timing information at the symbol level, and the adjustment. It includes a transmission unit (timing-related information transmission unit 150) that transmits a value or the offset value to the lower node.

One aspect of the present disclosure is a symbol level from an upper node (for example, wireless communication node 100A) when adjusting the downlink transmission timing and the uplink reception timing in the wireless communication node (for example, wireless communication node 100B). A control unit (control unit 170) that adjusts the downlink transmission timing and uplink transmission timing based on the timing-related information related to the timing adjustment in, and a transmission / reception unit (wireless transmission unit 161) that transmits and receives at the adjusted timing. And a wireless receiver 162).

One aspect of the present disclosure is a wireless communication method in a wireless communication node (for example, wireless communication node 100A), in which downlink transmission timing and uplink reception timing in a lower node (for example, wireless communication node 100B) are set. When adjusting, the step of determining the adjustment value of the reception timing based on the timing information (TA) used for determining the transmission timing of the uplink, or the offset value from the timing information at the symbol level, and the adjustment value or It includes a step of transmitting the offset value to the lower node.

One aspect of the present disclosure is a wireless communication method in a wireless communication node (for example, wireless communication node 100B), which is a downlink transmission timing and an uplink reception timing in the wireless communication node (for example, wireless communication node 100B). When adjusting, the step of adjusting the downlink transmission timing and the uplink transmission timing is adjusted based on the timing-related information regarding the timing adjustment at the symbol level from the upper node (for example, wireless communication node 100A). It includes a transmission / reception step in which transmission / reception is performed at the same timing.

FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10. FIG. 2 is a diagram showing a basic configuration example of the IAB. FIG. 3 is a functional block configuration diagram of the wireless communication node 100A. FIG. 4 is a functional block configuration diagram of the wireless communication node 100B. FIG. 5 is a diagram showing an example of the relationship between T _{propagation_0} , TA and T_delta. FIG. 6 is a diagram showing an example of alignment of symbol level timing at the parent node and the IAB node in Case # 7. FIG. 7 is a diagram showing an example of slot-level reception timing alignment. FIG. 8 is a diagram showing an operation example 1 of symbol-level reception timing alignment. FIG. 9 is a diagram showing an operation example 2 of symbol-level reception timing alignment. FIG. 10 is a diagram showing an example of the hardware configuration of the CU 50 and the wireless communication nodes 100A to 100C.

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. The wireless communication system 10 is a wireless communication system according to 5G New Radio (NR), and is composed of a plurality of wireless communication nodes and terminals.

Specifically, the wireless communication system 10 includes wireless communication nodes 100A, 100B, 100C, and a terminal 200 (hereinafter, UE200, User Equipment).

Wireless communication nodes 100A, 100B, 100C can set wireless access with UE200 and wireless backhaul (BH) between the wireless communication nodes. Specifically, a backhaul (transmission path) by a wireless link is set between the wireless communication node 100A and the wireless communication node 100B, and between the wireless communication node 100A and the wireless communication node 100C.

In this way, the configuration in which the wireless access with the UE 200 and the wireless backhaul between the wireless communication nodes are integrated is called Integrated Access and Backhaul (IAB).

IAB reuses existing features and interfaces defined for wireless access. In particular, Mobile-Termination (MT), gNB-DU (Distributed Unit), gNB-CU (Central Unit), User Plane Function (UPF), Access and Mobility Management Function (AMF) and Session Management Function (SMF), and support Interfaces such as NR Uu (between MT and gNB / DU), F1, NG, X2 and N4 are used as baselines.

The wireless communication node 100A is connected to the NR radio access network (NG-RAN) and core network (Next Generation Core (NGC) or 5GC) via a wired transmission line such as a fiber transport. NG-RAN / NGC includes CentralUnit 50 (hereinafter referred to as CU50), which is a communication node. In addition, NG-RAN and NGC may be included and simply expressed as "network".

The CU50 may be composed of any or a combination of UPF, AMF, and SMF described above. Alternatively, the CU 50 may be a gNB-CU as described above.

FIG. 2 is a diagram showing a basic configuration example of IAB. As shown in FIG. 2, in the present embodiment, the wireless communication node 100A constitutes a parent node (Parent node) in the IAB, and the wireless communication node 100B (and the wireless communication node 100C) constitutes an IAB node in the IAB. .. The parent node may be called an IAB donor. Further, a Grand Parent node (not shown) which is a parent node of the parent node may be configured.

The child node in the IAB is composed of other wireless communication nodes (not shown in FIG. 1). Alternatively, the UE 200 may configure a child node.

A wireless link is set between the parent node and the IAB node. Specifically, a wireless link called Link_parent is set.

A wireless link is set between the IAB node and the child node. Specifically, a wireless link called Link_child is set.

The wireless link set between such wireless communication nodes is called a wireless backhaul link. Link_parent is composed of DLParentBH in the downlink (DL) direction and ULParentBH in the uplink (UL) direction. Link_child is composed of DLChild BH in the DL direction and ULChild BH in the UL direction.

In other words, in IAB, the direction from the parent node to the child node (including UE200) is the DL direction, and the direction from the child node to the parent node is the UL direction.

The wireless link set between the UE200 and the IAB node or parent node is called a wireless access link. Specifically, the wireless link is composed of DL Access in the DL direction and UL Access in the UL direction.

The IAB node has a MobileTermination (MT), which is a function for connecting to a parent node, and a DistributedUnit (DU), which is a function for connecting to a child node (or UE200). The child node may be called a lower node.

Similarly, the parent node has an MT for connecting to the upper node and a DU for connecting to the lower node such as the IAB node. The parent node may have a CU (Central Unit) instead of the MT.

Similarly to the IAB node and the parent node, the child node also has an MT for connecting to a higher node such as an IAB node and a DU for connecting to a lower node such as UE200.

For wireless resources used by DU, DL, UL and Flexible time-resource (D / U / F) can be either hard, soft or Not Available (H / S / NA) from a DU perspective. being classified. Also, in the software (S), availability or not available is specified.

Although the IAB configuration example shown in FIG. 2 uses CU / DU division, the IAB configuration is not necessarily limited to such a configuration. For example, in the wireless backhaul, IAB may be configured by tunneling using GPRS Tunneling Protocol (GTP) -U / User Datagram Protocol (UDP) / Internet Protocol (IP).

The main advantage of such IAB is that NR cells can be arranged flexibly and at high density without increasing the density of the transport network. The IAB can be applied in a variety of scenarios, such as outdoor small cell placement, indoors, and even support for mobile relays (eg, in buses and trains).

The IAB may also support NR-only stand-alone (SA) deployments or non-standalone (NSA) deployments including other RATs (LTE, etc.), as shown in FIGS. 1 and 2.

In this embodiment, the wireless access and the wireless backhaul operate on the premise of half-duplex communication. However, it is not necessarily limited to half-duplex communication, and full-duplex communication may be used as long as the requirements are satisfied.

In addition, time division multiplexing (TDM), spatial division multiplexing (SDM), and frequency division multiplexing (FDM) can be used as the multiplexing method.

When the IAB node operates in half-duplex communication (Half-duplex), DLParentBH is the receiving (RX) side, ULParentBH is the transmitting (TX) side, DLChildBH is the transmitting (TX) side, and UL. Child BH is the receiving (RX) side. In the case of Time Division Duplex (TDD), the DL / UL setting pattern on the IAB node is not limited to DL-F-UL, but only the wireless backhaul (BH), UL-F-DL, and other setting patterns. May be applied.

Further, in the present embodiment, as an example, SDM / FDM may be used to realize simultaneous operation of DU and MT of the IAB node.

(2) Functional Block Configuration of Wireless Communication System Next, the functional block configuration of the wireless communication node 100A and the wireless communication node 100B constituting the wireless communication system 10 will be described.

(2.1) Wireless communication node 100A
FIG. 3 is a functional block configuration diagram of the wireless communication node 100A constituting the parent node. As shown in FIG. 3, the wireless communication node 100A includes a wireless transmission unit 110, a wireless reception unit 120, an NW IF unit 130, a control unit 140, and a timing-related information transmission unit 150.

The wireless transmitter 110 transmits a wireless signal according to the 5G specifications. In addition, the wireless receiver 120 receives a wireless signal according to the 5G specifications. In the present embodiment, the wireless transmission unit 110 and the wireless reception unit 120 execute wireless communication with the wireless communication node 100B constituting the IAB node. In the present embodiment, the wireless receiver 120 receives capability information regarding the ability of timing adjustment at the symbol level from a lower node such as the wireless communication node 100B (for example, whether or not Case # 7 is supported at the symbol level, etc.). A receiving unit that receives information) may be configured.

In the present embodiment, the wireless communication node 100A has the functions of MT and DU, and the wireless transmitting unit 110 and the wireless receiving unit 120 also transmit and receive wireless signals corresponding to MT / DU.

The NW IF unit 130 provides a communication interface that realizes a connection with the NGC side and the like. For example, the NW IF unit 130 may include interfaces such as X2, Xn, N2, and N3.

The control unit 140 controls each functional block constituting the wireless communication node 100A. In particular, in the present embodiment, the control unit 140 controls the transmission timing of DL and UL and the reception timing of UL. Specifically, the control unit 140 can adjust the DL transmission timing and the UL transmission timing at the lower node, for example, the wireless communication node 100B (IAB node). Further, the control unit 140 can adjust the UL reception timing in the wireless communication node 100B (IAB node).

The adjustment of the DL transmission timing of each wireless communication node including the wireless communication node 100A may correspond to Case # 1 specified in 3GPP TR 38.874, as will be described later.

Furthermore, adjusting the DL and UL reception timing at the IAB node may correspond to Case # 3.

Further, the adjustment at the IAB node may include adjustment of the DL transmission timing at the IAB node, and the DL and UL reception timings may be adjusted within the IAB node.

That is, the control unit 140 can support Case # 7, which is a combination of adjusting the DL transmission timing of Case # 1 and adjusting the UL reception timing of Case # 3.

The control unit 140 can acquire the propagation delay between the wireless communication node 100A (parent node) and the wireless communication node 100B (lower node).

Specifically, the control unit 140 calculates the propagation delay of the path (0) between the parent node and the lower node based on (Equation 1).

T _{propagation_0} = (TA / 2 + T_delta)… (Equation 1)
TA is a Timing Advance (TA) value for determining the UE transmission timing specified in 3GPP Release 15. Here, TA may be referred to as timing information.

In addition, T_delta is determined in consideration of the switching time from reception to transmission of the parent node. The various propagation delays T _prop1 , T _{prop 2} , etc. will be described later.

As described above, when the control unit 140 adjusts the DL transmission timing of Case # 1 and the UL reception timing of Case # 3 at the IAB node (may be read as corresponding to Case # 7). The propagation delay between the wireless communication node 100A (parent node) and the wireless communication node 100B (lower node) used to determine the DL transmission timing, and the wireless communication node 100A used to determine the UL transmission timing in the wireless communication node 100B. And the propagation delay between the wireless communication node 100B and the wireless communication node 100B may be acquired.

The propagation delay may mean T _{propagation_0} , or may mean T1, T _prop1 , T2, T _porp2 , TA / 2, or TA. In addition, the propagation delay may be referred to as a transmission time, a delay time, or simply a delay, and other as long as it indicates the time required for DL or UL transmission between the wireless communication nodes constituting the IAB. It may be called by name.

Further, when the control unit 140 adjusts the DL transmission timing and the UL reception timing in the lower node (may be read as the case corresponding to Case # 7), the timing information used for determining the UL transmission timing, Specifically, the adjustment value of the reception timing based on TA or the offset value from the timing information (TA) may be determined.

Here, the adjustment value of the reception timing based on TA may be the value of TA by the TA command in Random Access Response (RAR). In the present embodiment, the adjustment value, the timing information, or the TA value assumes a positive (+) value and does not assume a negative (-) value. Therefore, information indicating a positive or negative value in the TA value or the like. It is not necessary to add (eg 1 bit). However, positive information may be added to these adjustment values, TA values, and the like.

Alternatively, the value of the TA (N _TA ) may be an extended value. Specifically, in 3GPP Release-15, NTA can take values of 0,1,2, ..., 3846, but the adjustment value of reception timing based on _TA is, for example, a value of 3847-4095. Since a negative value can be shown by subtracting from 3846 using, it may be treated as a positive value by using a value after 3847.

In principle, Timing Advance (TA) has a positive direction of going back in time and a negative direction of going back in time. Therefore, assuming that the timing information, the adjustment value, or the offset value is a positive value or not a negative value, in the present embodiment, the transmission timing is shifted backward in time for transmission. It may mean that it is assumed to be transmitted in advance in time (in advance) without assuming that it will be performed.

Further, the offset value from the timing information (TA) may indicate the TA specified in 3GPP Release 15 or the offset (time) from the TA value. The offset value may be a value conforming to TA, or may not be a value conforming to TA as long as the offset time can be determined.

As an example, in the present embodiment, when the control unit 140 adjusts the DL transmission timing and the uplink reception timing in the lower node (may be read as the case of Case # 7), the timing information (TA). The adjustment value of the reception timing based on, or the offset value from the timing information is determined at the symbol level.

More specifically, the control unit 140 determines the downlink reception timing (MT Rx timing) and the downlink transmission timing (DU Tx timing) from the offset symbol length (1 symbol length × number of symbols to be offset). The adjustment value or the offset value may be determined based on the time (T2) obtained by dividing the difference. In this case, the adjustment value or the offset value may be T2 itself. As a result, as an example, the lower node 100B notified of T2 sets the timing offset from the reception timing (MTRxtiming) by (TA-T2) / 2 as the downlink transmission timing (DUTxtiming). As a result, simultaneous reception on the parent node 100A can be realized.

As another example, the control unit 140 sets an adjustment value or an offset value based on the time difference (T1) from the downlink reception timing (MT Rx timing) to the downlink transmission timing (DU Tx timing). You may decide. In this case, the adjustment value or the offset value may be T1 itself. As an example, the lower node 100B notified of T1 sets the downlink transmission timing (DUTxtiming) from the reception timing (MTRxtiming) to (TA + T1- “Symbol length” × “offset”. Simultaneous reception on the parent node 100A can be realized by setting the timing with the number of symbols (number of Symbol) ”) / 2 offset.

The timing-related information transmission unit 150 transmits information regarding DL or UL transmission timing or reception timing (which may be referred to as timing-related information) to a lower node. Specifically, the timing-related information transmission unit 150 can transmit information (TA, T1, T2, etc.) regarding the transmission timing or reception timing of DL or UL to the IAB node and / or the child node. The timing-related information may include the number of symbols to be offset, the symbol length, and the like.

Further, the timing-related information transmission unit 150 can transmit the reception timing adjustment value based on the above-mentioned TA or the offset value from the TA to the lower node.

The timing information (TA) can be transmitted using the TA command in RandomAccessResponse (RAR) or MediumAccessControl-ControlElement (MAC-CE). Similarly, the DL transmission timing, the information indicating that the UL transmission timing or reception timing at the IAB node is adjusted, and the timing-related information indicating the above-mentioned adjustment value and offset value are also transmitted using MAC-CE. It may be transmitted using the signaling of an appropriate channel or higher layer (such as Radio Resource Control Layer (RRC)).

In addition, timing information and timing-related information may also be transmitted using appropriate channels or higher layer signaling.

Channels include control channels and data channels. The control channel includes PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), PBCH (Physical Broadcast Channel) and the like.

The data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel).

The reference signal includes Demodulation reference signal (DMRS), Sounding Reference Signal (SRS), Phase Tracking Reference Signal (PTRS), and Channel State Information-Reference Signal (CSI-RS), and the signal includes a channel. And reference signals are included. Further, the data may mean data transmitted via a data channel.

UCI is symmetric control information of Downlink Control Information (DCI) and is transmitted via PUCCH or PUSCH. UCI may include SR (Scheduling Request), HARQ (Hybrid Automatic repeat request) ACK / NACK, CQI (Channel Quality Indicator), and the like.

(2.2) Wireless communication node 100B
FIG. 4 is a functional block configuration diagram of the wireless communication node 100B constituting the IAB node. As shown in FIG. 4, the wireless communication node 100B includes a wireless transmission unit 161, a wireless reception unit 162, a downlink control information reception unit 165, and a control unit 170.

The wireless transmitter 161 transmits a wireless signal according to the 5G specifications. In addition, the wireless receiver 162 transmits a wireless signal according to the 5G specifications. In the present embodiment, the wireless transmission unit 161 and the wireless reception unit 162 communicate wirelessly with the wireless communication node 100A constituting the parent node and the child node (including the case of UE200) according to the timing adjusted by the control unit 170. Configure a transmitter / receiver that executes wireless communication with.

Further, in the present embodiment, the wireless transmission unit 161 and the wireless reception unit 162 may configure a transmission unit that transmits capability information regarding the ability of timing adjustment at the symbol level to an upper node, a lower node, or the like.

The timing-related information receiving unit 165 receives the timing-related information from the upper node. For example, the downlink control information receiving unit 165 can receive downlink control information (DCI) related to adjustment of DL transmission timing and UL reception timing.

Further, the timing-related information receiving unit 165 may receive a DCI indicating which of Case # 1, Case # 6, and Case # 7 is applied. That is, Case # 1, Case # 6, and Case # 7 may be dynamically changed (switched) in the network.

The control unit 170 controls each functional block constituting the wireless communication node 100B. In particular, in the present embodiment, the control unit 170 can adjust the DL transmission timing and the UL transmission timing and reception timing in the wireless communication node 100B (lower node) at the symbol level.

Specifically, when the control unit 170 adjusts the DL transmission timing and the UL reception timing on the wireless communication node 100B (may be read as the case corresponding to Case # 7), the symbol level from the upper node. The transmission / reception timing may be adjusted based on the timing-related information regarding the timing adjustment in.

As an example, the control unit 170 determines the DL transmission timing in the upper node (for example, the wireless communication node 100A) and the wireless communication based on the time related to the switching from the UL reception to the DL transmission, specifically, T_delta. The DL transmission timing on the node 100B may be adjusted. In this case, T_delta may be a value that is half of the switching time from reception to transmission in the upper node (parent node). That is, the control unit 170 may adjust the DL transmission timing in consideration of the switching time from reception to transmission at the parent node.

As an example, when the received timing-related information includes T2, the control unit 170 sets the downlink transmission timing (DUTxtiming) from the reception timing (MTRxtiming) to (TA-T2) / 2. The timing of offsetting may be set.

As an example, when the received timing-related information includes T1, the control unit 170 sets the downlink transmission timing (DUTxtiming) from the reception timing (MTRxtiming) to (TA + T1- “symbol”. The timing may be set by offsetting the length (Symbol length) × “number of Symbols to be offset”) / 2.

The wireless communication node 100A may adjust the DL transmission timing.

(3) Operation of the wireless communication system Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to the adjustment between the transmission timing and the reception timing of DL and UL in the wireless communication system 10 will be described.

More specifically, the adjustment of DL and UL transmission timing in IAB, in particular, the adjustment operation of DL and UL transmission timing when Case # 7 specified in 3GPP TR 38.874 is applied will be described.

(3.1) 3GPP regulations First, the 3GPP regulations will be briefly explained. In 3GPP TR 38.874 (for example, V16.0.0), the following seven cases are specified in order to match the transmission timing of DL or UL between the wireless communication nodes constituting the IAB.

(Case # 1): DL transmission timing adjustment between IAB node and IAB donor (Case # 2): DL and UL transmission timing adjustment within IAB node (Case # 3): DL and UL reception timing IAB Adjustment within the node (Case # 4): Transmission by Case # 2 and reception by Case # 3 within the IAB node (Case # 5): Application of Case # 1 to access link timing within the IAB node in different time slots , And application of Case # 4 to backhaul link timing (Case # 6): DL transmission timing adjustment of Case # 1 + UL transmission timing adjustment of Case # 2 (Case # 7): DL transmission timing adjustment of Case # 1 + UL reception timing adjustment in Case # 3 In 3GPP Release 16, as described above, the IAB node uses the calculation formula (TA / 2 + T_delta) to match the DL transmission timing of the DU between the wireless communication nodes that make up the IAB. It is stipulated that the propagation delay (T _{propagation_0} ) of the path (0) with the parent node is calculated and the transmission timing is offset for transmission.

Here, TA is the value of Timing Advance for determining the UE transmission timing specified in 3GPP Release 15, and T_delta is determined in consideration of the switching time from reception to transmission of the parent node. Ru.

FIG. 5 is a diagram showing an example of the relationship between the propagation delay T _{propagation_0} , TA, and T_delta. As shown in FIG. 5, T _{propagation_0} is the value obtained by dividing TA between the parent node and the IAB node by adding T_delta. T_delta may correspond to a value obtained by halving the gap (Tg) associated with the switching time from UL reception to DL transmission at the parent node.

However, as will be described later, when Case # 7 is supported, simultaneous reception of MT Rx and DU Rx on the parent node 100A (Case # 3) and simultaneous transmission of DU on the parent node 100A and lower node 100B (Case # 1) The propagation delay is not only the propagation delay between the parent node 100A and the lower node 100B (T _prop2 ), but also the propagation delay between the parent node 100A and its parent node (Grandparent node). T _prop1 ) must be considered.

Therefore, in the present embodiment, Tg or T_delta in FIG. 5 simply considers the propagation delay T _prop1 from the parent (Grandparent), not the switching time of DU transmission / reception in the parent node 100A. (T _{propagation_0} in FIG. 5 corresponds to T _prop2 here). Further, the calculated TA is also the timing information adjusted at the symbol level in the present embodiment. The detailed calculation method will be described later.

Below, we will explain the operations related to DL transmission timing and UL reception timing when the wireless communication nodes that make up the IAB support Case # 7 in addition to Case # 1. When Case # 7 is supported, in addition to Case # 1 (matching DL transmission timing between IAB node and IAB donor), DL and UL reception timing within the IAB node are also matched.

Note that the following contents may be assumed as the premise of the operation example described later.

・ Because of the restrictions of half-duplex communication, either TDM / SDM / FDM is applied to the backhaul link and access link of the IAB node. In the case of SDM or FDM, DU and MT can be sent or received at the same time.

・ When supporting SDM / FDM using a single panel, support for Case # 7 is required for simultaneous reception at the IAB node.

・ Case # 1 is supported by both backhaul link and access link transmission timing.

・ Case # 7 is supported only when it is compatible with the UE of Release 15.

・ The IAB node needs to set the DL transmission timing for TA / 2 + T_delta before the DL reception timing.

・ Timing-related information such as T_delta, T1, T2, etc. is notified from the parent node. The value of T_delta takes into account factors such as the time to switch from transmit to receive (or vice versa), the offset between DL transmission and UL reception on the parent node due to factors such as hardware failure.

-TA is derived based on the provisions of Release 15. TA can be interpreted as a timing gap between the UL transmission timing and the DL reception timing, but in the present embodiment, T _{prop 1} and the like may be further considered.

-In order to adjust the DL transmission timing of the IAB node by setting the DL transmission timing (TA / 2 + T_delta) of the IAB node before the DL reception timing, T_delta is the UL reception of the IAB node in the parent node. It is necessary to set the time interval between the start of frame i and the start of DL transmission frame i (-1 / 2).

Furthermore, the following contents may be assumed for the timing adjustment of Case # 7.

-Only positive TA is assumed between the IAB node / UE that supports the new TA value and the child IAB node / UE that supports the new TA value, that is, no negative TA is assumed.

・ Negative TA can be introduced between the IAB node / UE that supports the new TA value and the child IAB node / UE that does not support the new TA value.

・ The number of symbols to be offset is notified from the parent node, and if it is 0, the timing is adjusted at the Slot level.

・ In order to enable timing adjustment of DL reception and UL reception within the IAB node, it can operate as follows.

(Alt. 1): Negative time adjustment (TA) of the IAB node applied to the child node of the IAB node is not assumed.

(Alt. 2): A positive TA that enables symbol (OFDM symbol) alignment but does not enable slot alignment is applied between DL reception and UL reception at the IAB node.

The operation example of the timing adjustment of Case # 7 will be described below.

(3.2) Operation example In the operation example described below, Over-the-Air (OTA) of Case # 7 (combination of Case # 1 and Case # 3) described above is performed between the wireless communication nodes constituting the IAB. ) Achieve synchronization.

(3.2.1) Operation Regarding the notification of timing information and timing related information based on Case # 3 (matching the timing of DL reception of MT of parent node and UL reception of DU), it operates as follows. May be good.

・ Do not assume a negative value for TA ・ Introduce an offset value from the TA value ・ Introduce adjustment value T1 or T2

Regarding how to obtain timing-related information such as TA, T1, T2 values, offset symbol length (number of symbols) notified from parent node 100A to IAB node 100B (lower node), and specific examples of timing adjustment method in lower node. This will be described below.

FIG. 6 shows an example of alignment of symbol level timing at the parent node and the IAB node in Case # 7. The symbol level may mean that the OFDM symbol transmitted / received between the wireless communication nodes is used as a reference.

As shown in FIG. 6, the symbol-level reception timing alignment is different from the slot-level reception timing alignment in that the IAB node cannot cause a situation where a negative TA is required, so the TA is negative. Not expected to be a value.

As described above, when Case # 7 is supported, both MT Rx and DU Rx simultaneous reception (Case # 3) on the parent node 100A and DU simultaneous transmission (Case # 1) on the parent node 100A and the lower node 100B are both performed. Since it is necessary to realize it, consider not only the propagation delay (T _prop2 ) between the parent node 100A and the lower node 100B, but also the propagation delay (T _prop1 ) between the parent node 100A and its parent node (Grandparent node). Timing related information (T1, T2, etc.) must be sought. In the following, the signaling operation for adjusting the UL transmission timing of MT and the DL transmission timing of DU in the IAB node will be described more specifically.

(3.2.2) Operation example 1
In this operation example, the case where T2 is notified from the parent node will be described for the adjustment of the DU transmission timing at the IAB node.

Here, FIG. 7 is a diagram showing an example of slot-level reception timing alignment. FIG. 8 is a diagram showing an operation example 1 of symbol-level reception timing alignment. In each figure, the part surrounded by the rounded frame of # 3 shows the simultaneous reception of MT Rx and DU Rx (Case # 3) at the parent node 100A in Case # 7. The part surrounded by the rounded frame of # 1 indicates the simultaneous transmission of DU (Case # 1) in the parent node 100A and the lower node 100B. As described above, T _prop1 is the propagation delay between the parent node 100A and its grandparent node, and T _prop2 is the propagation delay between the parent node 100A and the lower node 100B.

As shown in Fig. 7, DU Rx timing is adjusted to MT Rx timing to support simultaneous reception of Parent nodes (# 3). Therefore, Parent node sets TA corresponding to IAB node.

When matching MT Rx timing and DU Rx timing at Slot level, TA may take a negative value as shown in FIG. That is, as illustrated in FIG. 7, if the propagation delay (T _prop1 ) between the Parent node and its parent node is greater than twice the propagation delay (T _prop2 ) between the Parent node and the IAB node, TA is a negative value. It becomes.

In addition, IAB node sends using TA and T1 (difference between MTRx timing and DU Tx timing of Parent node) in order to match DU Tx timing of Parent node and DU Tx timing of IAB node (# 1). The offset value of (= (TA + T1) / 2) can be derived.

On the other hand, as shown in FIG. 8, TA is not assumed to be negative in the symbol level reception timing alignment.

The example shown in FIG. 8 is an operation example of the symbol level timing adjustment when the Parent node notifies T2. Here, T2 is "1 symbol length" x "number of symbols to be offset"-(difference between MT Rx timing and DU Tx timing) as described above.

As shown in Fig. 8, DU Rx timing is adjusted to MT Rx timing to support simultaneous reception of Parent nodes (# 3). Therefore, Parent node sets TA corresponding to IAB node. As mentioned above, when MT Rx timing and DU Rx timing are matched at symbol level, TA can always take a positive value (IAB node does not assume that TA will be a negative value).

When using the T2 notification of Parent node as the derivation method of DU Tx timing of IAB node, the following method can be adopted.

That is, the Parent node notifies T2 ("1 symbol length" x "number of symbols to offset"-(difference between MT Rx timing and DU Tx timing). In the figure, "number of symbols to offset" is 1 symbol. The case is illustrated as an example.

IAB node sets the timing as DUTxtiming by offsetting (TA-T2) / 2 from MTRxtiming as shown in the figure. In this case, the IAB node does not need to be instructed by the parent node as "the number of symbols to be offset", but may be notified separately.

(3.2.3) Operation example 2
Next, regarding the adjustment of the DU transmission timing at the IAB node, operation example 2 when T1 is notified from the parent node will be described. FIG. 9 is a diagram showing an operation example 2 of symbol-level reception timing alignment.

Here, T1 is the difference between MTRx timing and DU Tx timing of Parent node as described above (the definition of T1 is the same as that of Slot level timing alignment described above).

When the Parent node notifies T1, the IAB node sets the timing as DU Tx timing by offsetting (TA + T1- “Symbol length” x “number of Symbol”) / 2 from MT Rx timing. ..

The Parent node derives the "number of symbols to offset" according to the length of T1. For example, in the case of 1 OFDM symbol length <T1 <2 OFDM symbol length, the "number of symbols to be offset" is 1.

Parent node may explicitly or implicitly notify IAB node of the "number of symbols to offset" in addition to T1. As an example of implicit notification, IAB node may specify or assume that the smallest positive integer greater than T1 is the number of symbols to offset.

Note that the "number of symbols to be offset" may include 0 (for example, it may be selected from 0, 1, 2, and 3). If it is 0, it may mean that Slot level timing alignment is performed.

(3.2.4) Operation example 3
In this operation example, an example of ability information regarding the ability of timing adjustment at the symbol level will be described.

That is, the IAB-node may report the Capability of case # 7 to the upper node, the lower node, or the network implicitly or explicitly.

For example, as an example of implicitly reporting capability information, Parentnode reports MT-Tx / DU-Rx and / or MT-Rx / DU-in addition to reporting MT-Rx / DU-Rx no-TDM. When receiving the Tx TDM report, it may be judged that the IAB-node corresponds to the timing adjustment (OTA timing alignment) of case # 7.

Further, as an example of explicitly reporting the ability information, the IAB-node may report any of the following information to the Parent node as the ability information.
・ As an IAB-node, whether or not case # 7 can be supported ・ For each FR1 and FR2, for each case # 7 ・ For each frequency band, for each case # 7 ・ For each frequency combination, case # 7 Support for each ・ Support for Symbol level timing alignment

(4) Action / Effect According to the above-described embodiment, the following action / effect can be obtained. Specifically, the wireless communication node 100A (parent node) sets the UL reception timing adjustment value (negative TA) based on the timing information (TA) used to determine the UL transmission timing, or the offset value from the TA. It is determined at the symbol level, and timing-related information regarding the determined adjustment value or offset value can be transmitted to the wireless communication node 100B (lower node).

Therefore, even if Case # 7 is supported, the IAB node can perform timing adjustment at the symbol level based on the adjustment value or offset value, and in addition to Case # 1, the DL and UL reception timings on the IAB node can be received. Can be matched. That is, according to the wireless communication system 10, the transmission timing and the reception timing of the DU and MT can be reliably matched in the IAB.

In this embodiment, it is assumed that the timing information, adjustment value or offset value is a positive value or not a negative value.

Therefore, information indicating positive or negative (1 bit) becomes unnecessary, and the load of information transmission and calculation is reduced.

In the present embodiment, the control unit 140 determines the adjustment value or the offset value based on the time T2 obtained by subtracting the time difference between the reception of the downlink and the transmission of the downlink from the offset symbol length.

As a result, in the case of Case # 7, where Case # 3 must be realized in addition to Case # 1, the propagation delay T _prop1 from the parent node of the parent node and the offset symbol length are also taken into consideration. The adjustment value T2 makes it possible to appropriately notify the lower node of timing-related information by a simple means.

In the present embodiment, the control unit 140 determines the adjustment value or the offset value based on the time difference T1 from the reception of the downlink to the transmission of the downlink.

As a result, in the case of Case # 7, where Case # 3 must be realized in addition to Case # 1, in addition to the propagation delay between IAB node 100B and parent node 100A, from the parent (Grandparent) node of the parent node. The adjustment value T1 that also takes into account the propagation delay T _prop1 makes it possible to appropriately notify the lower node of timing-related information by a simple means.

In this embodiment, the lower node 100B notifies the parent node 100A of the ability information regarding the ability of timing adjustment at the symbol level.

As a result, the parent node 100A can obtain information on whether or not the lower node can adjust the timing according to Case # 7.

(5) Other Embodiments Although the contents of the present invention have been described above with reference to the examples, the present invention is not limited to these descriptions, and various modifications and improvements are possible. It is self-evident to the trader.

For example, in the above-described embodiment, the names of the parent node, the IAB node, and the child node have been used, but wireless communication in which wireless backhaul between wireless communication nodes such as gNB and wireless access with the terminal are integrated. The names may be different as long as the node configuration is adopted. For example, it may be simply called a first node, a second node, or the like, or it may be called an upper node, a lower node, a relay node, an intermediate node, or the like.

Further, the wireless communication node may be simply referred to as a communication device or a communication node, or may be read as a wireless base station.

In the above-described embodiment, the terms downlink (DL) and uplink (UL) were used, but they may be referred to by other terms. For example, it may be replaced with or associated with terms such as forward ring, reverse link, access link, and backhaul. Alternatively, terms such as first link, second link, first direction, and second direction may be used.

Further, the block configuration diagrams (FIGS. 3 and 4) used in the description of the above-described embodiment show the blocks of the 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 CU50 and wireless communication nodes 100A to 100C (the device) may function as a computer that processes the wireless communication method of the present disclosure. FIG. 10 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 10, 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 each 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. 3 and 4) is realized by any hardware element of the computer device or a combination of the hardware elements. FIG. 10 is a diagram showing an example of the hardware configuration of the CU 50 and the wireless communication nodes 100A to 100C.

For each function in the device, the processor 1001 performs calculations by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and controls communication by the communication device 1004, or the memory 1002 and the memory 1002. It is realized by controlling at least one of reading and writing of data in the 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 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 (eg Downlink Control Information (DCI), Uplink Control Information (UCI), higher 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 Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system ( ^4G ), 5th generation mobile communication system. (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)) ), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize suitable systems and at least 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 boolean 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.

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 coverage area of the base station 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 part or all of a base station that provides communication services in this coverage and at least one of the coverage areas of a base station subsystem.

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, wireless 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 transmitter / receiver in the time domain, and the like may be indicated.

The slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time region. 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. The mini-slot may also 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 an LTE system, a 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 mini slot is called TTI, one or more TTIs (that is, one or more slots or one or more mini slots) 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, mini slots 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, included in RB. 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 energy 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. Thus, 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 mode 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 wireless communication system 50 CU
100A, 100B, 100C Wireless communication node 110 Wireless transmitter 120 Wireless receiver 130 NW IF unit 140 Control unit 150 Timing-related information transmitter 161 Wireless transmitter 162 Wireless receiver 165 Timing-related information receiver 170 Control unit UE 200
1001 Processor 1002 Memory 1003 Storage 1004 Communication Device 1005 Input Device 1006 Output Device 1007 Bus

Claims (8)

When adjusting the downlink transmission timing and the uplink reception timing at the lower node, the adjustment value of the reception timing based on the timing information used for determining the uplink transmission timing, or the offset value from the timing information is used. , The control unit that determines at the symbol level,
A wireless communication node including a transmission unit that transmits timing-related information regarding the adjustment value or the offset value to the lower node. The wireless communication node according to claim 1, wherein the timing information, the adjustment value, or the offset value is assumed to be a positive value or not a negative value. The control unit determines the adjustment value or the offset value based on the time obtained by subtracting the time difference between the reception of the downlink and the transmission of the downlink from the offset symbol length according to claim 1 or 2. Described wireless communication node. The wireless communication node according to claim 1 or 2, wherein the control unit determines the adjustment value or the offset value based on the time difference between the reception of the downlink and the transmission of the downlink. The wireless communication node according to any one of claims 1 to 3, further comprising a receiving unit that receives capability information regarding the capability of timing adjustment at the symbol level from the lower node. When adjusting the downlink transmission timing and the uplink reception timing at the wireless communication node, the downlink transmission timing and the uplink reception timing are adjusted based on the timing-related information regarding the timing adjustment at the symbol level from the upper node. Control unit that adjusts the reception timing of
A wireless communication node including a transmission / reception unit that transmits / receives at adjusted timing. When adjusting the downlink transmission timing and the uplink reception timing at the lower node, the adjustment value of the reception timing based on the timing information used for determining the uplink transmission timing, or the offset value from the timing information is used. , Steps to determine at the symbol level,
A wireless communication method in a wireless communication node, which comprises a step of transmitting the adjustment value or the offset value to the lower node. When adjusting the downlink transmission timing and the uplink reception timing at the wireless communication node, the downlink transmission timing and the uplink reception timing are adjusted based on the timing-related information regarding the timing adjustment at the symbol level from the upper node. Steps to adjust the reception timing of
A wireless communication method in a wireless communication node that includes a step of transmitting and receiving at an adjusted timing.

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