WO2022153512A1 - Nœud de communication sans fil - Google Patents

Nœud de communication sans fil Download PDF

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Publication number
WO2022153512A1
WO2022153512A1 PCT/JP2021/001377 JP2021001377W WO2022153512A1 WO 2022153512 A1 WO2022153512 A1 WO 2022153512A1 JP 2021001377 W JP2021001377 W JP 2021001377W WO 2022153512 A1 WO2022153512 A1 WO 2022153512A1
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Prior art keywords
timing
node
wireless communication
reception
transmission
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PCT/JP2021/001377
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English (en)
Japanese (ja)
Inventor
大輔 栗田
浩樹 原田
Original Assignee
株式会社Ｎｔｔドコモ
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Application filed by 株式会社Ｎｔｔドコモ filed Critical 株式会社Ｎｔｔドコモ
Priority to CN202180090116.7A priority Critical patent/CN116830795A/zh
Priority to PCT/JP2021/001377 priority patent/WO2022153512A1/fr
Publication of WO2022153512A1 publication Critical patent/WO2022153512A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to a wireless communication node that sets wireless access and a wireless backhaul.
  • LTE Long Term Evolution
  • NR 5G New Radio
  • NG Next Generation
  • Non-Patent Document 1 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).
  • RAN radio access network
  • UE User Equipment
  • gNB wireless base stations
  • 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.
  • MT MobileTermination
  • DU Distributed Unit
  • wireless access and wireless backhaul are premised on half-duplex communication (Half-duplex) and time division multiplexing (TDM).
  • Half-duplex half-duplex communication
  • TDM time division multiplexing
  • SDM spatial division multiplexing
  • FDM frequency division multiplexing
  • 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.
  • DL downlink
  • UL uplink
  • 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.
  • 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
  • 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.
  • 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.
  • IAB Integrated Access and Backhaul
  • the purpose is to provide a wireless communication node that can be used.
  • the control unit 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.
  • TA timing information
  • 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.
  • a wireless receiver 162 wireless receiver
  • 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.
  • 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.
  • TA timing information
  • 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).
  • 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.
  • 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.
  • NR 5G New Radio
  • the wireless communication system 10 includes wireless communication nodes 100A, 100B, 100C, and a terminal 200 (hereinafter, UE200, User Equipment).
  • 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.
  • BH wireless backhaul
  • IAB Integrated Access and Backhaul
  • IAB reuses existing features and interfaces defined for wireless access.
  • MT Mobile-Termination
  • gNB-DU Distributed Unit
  • gNB-CU Central Unit
  • UPF User Plane Function
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • 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.
  • CU50 CentralUnit 50
  • 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.
  • the CU 50 may be a gNB-CU as described above.
  • FIG. 2 is a diagram showing a basic configuration example of IAB.
  • the wireless communication node 100A constitutes a parent node (Parent node) in the IAB
  • 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.
  • 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).
  • 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.
  • 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.
  • the direction from the parent node to the child node is the DL direction
  • 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.
  • 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).
  • MT MobileTermination
  • DU DistributedUnit
  • the child node may be called a lower node.
  • 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.
  • 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.
  • DL 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.
  • IAB configuration example shown in FIG. 2 uses CU / DU division
  • the IAB configuration is not necessarily limited to such a configuration.
  • IAB may be configured by tunneling using GPRS Tunneling Protocol (GTP) -U / User Datagram Protocol (UDP) / Internet Protocol (IP).
  • GTP GPRS Tunneling Protocol
  • UDP User Datagram Protocol
  • IP Internet Protocol
  • 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.
  • SA stand-alone
  • NSA non-standalone
  • the wireless access and the wireless backhaul operate on the premise of half-duplex communication.
  • half-duplex communication it is not necessarily limited to half-duplex communication, and full-duplex communication may be used as long as the requirements are satisfied.
  • TDM time division multiplexing
  • SDM spatial division multiplexing
  • FDM frequency division multiplexing
  • DLParentBH is the receiving (RX) side
  • ULParentBH is the transmitting (TX) side
  • DLChildBH is the transmitting (TX) side
  • UL Child BH is the receiving (RX) side.
  • TDD Time Division Duplex
  • 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.
  • SDM / FDM may be used to realize simultaneous operation of DU and MT of the IAB node.
  • FIG. 3 is a functional block configuration diagram of the wireless communication node 100A constituting the parent node.
  • 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.
  • the wireless receiver 120 receives a wireless signal according to the 5G specifications.
  • the wireless transmission unit 110 and the wireless reception unit 120 execute wireless communication with the wireless communication node 100B constituting the IAB node.
  • 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.
  • 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.
  • the NW IF unit 130 may include interfaces such as X2, Xn, N2, and N3.
  • 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.
  • adjusting the DL and UL reception timing at the IAB node may correspond to Case # 3.
  • 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.
  • 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).
  • control unit 140 calculates the propagation delay of the path (0) between the parent node and the lower node based on (Equation 1).
  • 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.
  • 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 may mean T propagation_0 , or may mean T1, T prop1 , T2, T porp2 , TA / 2, or TA.
  • 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.
  • 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.
  • the value of the TA may be an extended value.
  • 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.
  • Timing Advance 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the adjustment value or the offset value may be T1 itself.
  • 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.
  • 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 can be transmitted using the TA command in RandomAccessResponse (RAR) or MediumAccessControl-ControlElement (MAC-CE).
  • RAR RandomAccessResponse
  • MAC-CE MediumAccessControl-ControlElement
  • 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)).
  • RRC Radio Resource Control Layer
  • timing information and timing-related information may also be transmitted using appropriate channels or higher layer signaling.
  • the 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).
  • PDSCH Physical Downlink Shared Channel
  • 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.
  • DMRS Demodulation reference signal
  • SRS Sounding Reference Signal
  • PTRS Phase Tracking Reference Signal
  • CSI-RS Channel State Information-Reference Signal
  • UCI is symmetric control information of Downlink Control Information (DCI) and is transmitted via PUCCH or PUSCH.
  • DCI Downlink Control Information
  • UCI may include SR (Scheduling Request), HARQ (Hybrid Automatic repeat request) ACK / NACK, CQI (Channel Quality Indicator), and the like.
  • FIG. 4 is a functional block configuration diagram of the wireless communication node 100B constituting the IAB node.
  • 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.
  • the wireless receiver 162 transmits a wireless signal according to the 5G specifications.
  • 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.
  • 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.
  • the downlink control information receiving unit 165 can receive downlink control information (DCI) related to adjustment of DL transmission timing and UL reception timing.
  • DCI downlink control information
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 3GPP regulations will be briefly explained.
  • 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.
  • 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.
  • 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.
  • 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.
  • TDM / SDM / FDM is applied to the backhaul link and access link of the IAB node.
  • DU and MT can be sent or received at the same time.
  • 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.
  • 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).
  • 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.
  • ⁇ In order to enable timing adjustment of DL reception and UL reception within the IAB node, it can operate as follows.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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).
  • T2 is "1 symbol length” x "number of symbols to be offset"-(difference between MT Rx timing and DU Tx timing) as described above.
  • 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.
  • TA can always take a positive value (IAB node does not assume that TA will be a negative value).
  • the Parent node notifies T2 ("1 symbol length” x "number of symbols to offset"-(difference between MT Rx timing and DU Tx timing).
  • “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.
  • 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.
  • IAB node may specify or assume that the smallest positive integer greater than T1 is the number of symbols to offset.
  • the IAB-node may report the Capability of case # 7 to the upper node, the lower node, or the network implicitly or explicitly.
  • the IAB-node may report any of the following information to the Parent node as the ability information.
  • 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
  • the wireless communication node 100A 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).
  • TA timing information
  • 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.
  • timing information, adjustment value or offset value is a positive value or not a negative value.
  • 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.
  • the lower node 100B notifies the parent node 100A of the ability information regarding the ability of timing adjustment at the symbol level.
  • the parent node 100A can obtain information on whether or not the lower node can adjust the timing according to Case # 7.
  • 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.
  • 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.
  • 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.
  • 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.
  • a functional block that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter).
  • transmitting unit transmitting unit
  • transmitter transmitter
  • FIG. 10 is a diagram showing an example of the hardware configuration of the device.
  • 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.
  • 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.
  • FIG. 10 is a diagram showing an example of the hardware configuration of the CU 50 and the wireless communication nodes 100A to 100C.
  • 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.
  • CPU central processing unit
  • 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.
  • a program program code
  • a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used.
  • 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 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.
  • FDD frequency division duplex
  • TDD time division duplex
  • 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).
  • 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.
  • processor 1001 may be implemented using at least one of these hardware.
  • 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.
  • DCI Downlink Control Information
  • UCI Uplink Control Information
  • RRC signaling eg RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)).
  • MIB System Information Block
  • SIB System Information Block
  • 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.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • SUPER 3G IMT-Advanced
  • 4G 5th generation mobile communication system.
  • 5G Future Radio Access
  • FAA New Radio
  • NR New Radio
  • W-CDMA registered trademark
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB Ultra Mobile Broadband
  • 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.
  • 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 specific operation performed by the base station in the present disclosure may be performed by its upper node.
  • 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.).
  • S-GW network node
  • 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).
  • 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).
  • 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.
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • 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.).
  • wired technology coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
  • wireless technology infrared, microwave, etc.
  • a channel and a symbol may be a signal (signaling).
  • the signal may be a message.
  • the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.
  • system and “network” used in this disclosure are used interchangeably.
  • 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.
  • the radio resource may be one indicated by an index.
  • Base Station BS
  • Wireless Base Station Wireless Base Station
  • NodeB NodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • 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).
  • a base station subsystem eg, a small indoor base station (Remote Radio)
  • Communication services can also be provided by Head: RRH).
  • cell 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.
  • MS mobile station
  • UE user equipment
  • terminal terminal
  • 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.
  • at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
  • at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.
  • IoT Internet of Things
  • 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 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.
  • 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.
  • the time interval for example, the number of symbols
  • the transport block, code block, code word, etc. may be shorter than the TTI.
  • 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.
  • Bandwidth Part (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.
  • 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).
  • BWP for UL
  • DL BWP BWP for DL
  • 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.
  • “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
  • connection means 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.
  • connection may be read as "access”.
  • 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.
  • RS Reference Signal
  • Pilot pilot
  • references 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.
  • 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”.
  • 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”.
  • 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.
  • 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”.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Lors du réglage d'une synchronisation d'émission en liaison descendante et d'une synchronisation de réception en liaison montante dans un nœud de communication sans fil 100B, un nœud de communication sans fil 100A détermine, par un niveau de symbole : une valeur de réglage de la synchronisation de réception sur la base d'informations de synchronisation utilisées pour déterminer la synchronisation d'émission en liaison montante, ou une valeur de décalage à partir des informations de synchronisation. Le nœud de communication sans fil 100A émet la valeur de réglage ou la valeur de décalage déterminée vers le nœud de communication sans fil 100B.
PCT/JP2021/001377 2021-01-15 2021-01-15 Nœud de communication sans fil WO2022153512A1 (fr)

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PCT/JP2021/001377 WO2022153512A1 (fr) 2021-01-15 2021-01-15 Nœud de communication sans fil

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Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Study on Integrated Access and Backhaul; (Release 16)", 3GPP TR 38.874 V16.0.0, vol. 0, 1 December 2018 (2018-12-01), pages 1 - 111, XP055955986 *
INTEL CORPORATION: "Enhancements to Resource Multiplexing between Child and Parent Links of an IAB Node", 3GPP DRAFT; R1-2008995, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20201026 - 20201113, 24 October 2020 (2020-10-24), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051946779 *
NTT DOCOMO, INC.: "Other enhancements for simultaneous operation of IAB-node’s child and parent links", 3GPP DRAFT; R1-2101629, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 18 January 2021 (2021-01-18), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051971784 *

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