RU2774976C1 - Method and apparatus for selecting the transmission time, base station and machine-readable data carrier - Google Patents

Abstract

FIELD: communication.

SUBSTANCE: group of inventions relates to the field of communication of the new radio (NR) system related to the fifth generation (5G) mobile communication technology, and, in particular, to a method and apparatus for selecting the transmission time, a base station, and a machine-readable storage medium. Proposed is a method for selecting the transmission time. The method includes a stage wherein the second node sends time selection control information for controlling data transmission to the third node and/or the first node. The time selection control information is thereon used to control the coordination of selecting the time of receiving upstream data received by the second node and transmitted from the third node, and selecting the time of receiving downstream data received by the second node and transmitted from the first node, wherein the coordination of selecting the time of receiving upstream data received by the second node and transmitted from the third node, and selecting the time of receiving downstream data received by the second node and transmitted from the first node.

EFFECT: provided possibility of the second node simultaneously receiving data sent by the first node and data sent by the third node.

18 cl, 22 dwg

Description

The present application claims priority of PRC Patent Application No. 201811131366.7 filed with CNIPA on September 27, 2018, the contents of which are hereby incorporated by reference in their entirety.

FIELD OF TECHNOLOGY

Embodiments of the present application relate to, but are not limited to, the field of New Radio (NR) system communication, which relates to fifth generation (5G) mobile communication technology, and specifically relates to, but is not limited to, a method and apparatus for timing transmission, a base station, and a computer-readable storage medium.

BACKGROUND OF THE INVENTION

Compared with the Long Term Evolution (LTE) standard, 5G NR technology can use more bandwidth, such as millimeter wave bands, and can use large antennas and multi-beam systems. Therefore, 5G technology can achieve higher transmission speeds by providing the basis for the development of 5G NR and by using integrated access and transport (IAB) base stations. Thus, in NR networks, it is possible to deploy IAB in an integrated mode based on the management of access lines and traffic channels to simplify the deployment of a network with a dense location of nodes. The IAB base station integrates a radio access link and a radio transport link. The access link is a communication link between a user equipment (UE) and an IAB base station, and a radio transport link is a communication link between different IAB base stations for transporting data, so that the IAB base station does not need a wired communication network for transporting data. Based on this, it is more convenient to deploy the IAB base station in a dense node scenario, so that the cost associated with deploying a wired data network can be reduced.

The IAB nodes may perform access link and transport link multiplexing in the time domain, frequency domain, or space domain. The access link and transport link can be on the same frequency (and called in-band) or on different frequencies (and called out-of-band). Efficient out-of-band relay support is very important for some NR deployment scenarios and it should be understood that half-duplex in-band interference coordination is very important. In a half-duplex transmission situation, the IAB network does not assume that an IAB node can simultaneously perform a transmit operation and a receive operation, for example, an IAB node cannot simultaneously perform a transmit operation and a receive operation in time division duplex (TDD) mode, but the access operation is not excluded . Due to the half-duplex communication limitation of an IAB node, an IAB node cannot send downstream data while receiving data sent by a parent node, and likewise cannot send data to a parent node while receiving data from a child node. In other words, the two transfer operations shown in FIG. 1 cannot be fulfilled. Therefore, the transmission timing control mode for the IAB network supporting the multi-hop link has poor performance. Sending data and receiving data cannot be done at the same time in the same time period, and they need to be interleaved by intervals or other modes, so the transmission time delay is greatly increased, dedicated resources are wasted, and thus the resource utilization is low. .

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method and apparatus for timing transmission, a base station, and a computer-readable storage medium for solving the problem of excessively low transmission efficiency caused by the fact that uplink reception and downlink reception or uplink transmission and downlink transmission cannot be performed at the same time during communication control between nodes.

In one embodiment of the present invention, a transmission timing method is provided. The method includes the steps described below.

The second node sends timing control information for managing data transmission to the third node of the second node and/or the first node of the second node.

The timing control information is used to control the timing of reception of the uplink data received by the second node and transmitted from the third node and timing of the reception of the downstream data received by the second node and transmitted from the first node, or to control the timing of the transmission of downstream data by the second node. and timing of uplink data transmission by the second node.

In one embodiment of the present invention, a transmission timing method is also provided. The method includes the steps described below.

The third node receives timing control information sent by the second node and the downlink timing of each node.

The timing of the uplink data sent by the third node to the second node is consistent with the timing of the downlink data received by the second node from the first node according to the timing control information.

In one embodiment of the present invention, a device for selecting transmission timing is also provided. The transmission timing device comprises a first timing control module.

The first timing control module is configured to send timing control information to control data transmission to the third node of the second node and/or the first node of the second node.

The timing control information is used to control the timing of reception of the uplink data received by the second node and transmitted from the third node and timing of the reception of the downstream data received by the second node and transmitted from the first node, or to control the timing of the transmission of downstream data by the second node. and timing of uplink data transmission by the second node.

In one embodiment of the present invention, a scheduling device for transmission multiplexing is also provided. The device comprises a receiving module and a second timing adjustment module.

The receiving module is configured to receive timing control information sent by the second node and timing downlink transmission of each node.

The second timing adjustment module is configured to match the timing of the uplink data sent by the third node to the second node with the timing of the downlink data received by the second node from the first node, according to the timing control information.

In one embodiment of the present invention, a base station is further provided. The base station contains a processor, a memory device, a communication unit and a communication bus.

The communication bus is configured to implement a radio communication connection between the processor, the communication unit and the storage device.

The processor is configured to execute one or more first programs stored in the storage device to implement the steps of the above-described transmission timing method.

The processor is configured to execute one or more second programs stored in the storage device to implement the steps of the above-described transmission timing method.

In one embodiment of the present invention, a computer-readable storage medium is further provided. The computer-readable storage medium stores one or more first computer programs and one or more second computer programs. One or more first computer programs may be executed by one or more processors to implement the steps of the transmission timing described above.

One or more second computer programs may be executed by one or more processors to implement the steps of the transmission timing described above.

BRIEF DESCRIPTION OF GRAPHICS

In FIG. 1 is a diagram showing data transmission of IAB nodes according to the prior art;

in fig. 2 is a diagram showing the relationship of nodes and links in an IAB network according to one embodiment of the present invention;

in fig. 3 is a schematic diagram of a UE implementing once data transmission and feedback based on the IAB network of FIG. 2;

in fig. 4 is a diagram showing data transmission of IAB nodes according to one embodiment of the present invention;

FIG. 5 is a flowchart of a method for timing transmission of IAB nodes according to one embodiment of the present invention;

in fig. 6 is a flowchart of a parent node transmission timing method according to one embodiment of the present invention;

in fig. 7 is a flowchart of a child node transmission timing method according to one embodiment of the present invention;

in fig. 8A and FIG. 8B are diagrams illustrating spacing matching of data emitting nodes according to one embodiment of the present invention;

in fig. 9 is a diagram illustrating interval boundary negotiation of nodes achieving simultaneous reception in an IAB network according to one embodiment of the present invention;

in fig. 10 is a diagram illustrating OFDM symbol negotiation of nodes achieving simultaneous reception in an IAB network according to one embodiment of the present invention;

in fig. 11 is another diagram showing OFDM symbol negotiation of nodes achieving simultaneous reception in an IAB network according to one embodiment of the present invention;

in fig. 12 is a diagram illustrating the interval boundary negotiation of nodes that are initially available achieving simultaneous reception in an IAB network according to one embodiment of the present invention;

in fig. 13 is another diagram illustrating the interval boundary negotiation of nodes that are initially available achieving simultaneous reception in an IAB network according to one embodiment of the present invention;

in fig. 14 is another diagram illustrating the interval boundary negotiation of nodes that are initially available achieving simultaneous reception in an IAB network, according to one embodiment of the present invention;

in fig. 15 is a diagram illustrating slot boundary negotiation of nodes achieving simulcast in an IAB network according to one embodiment of the present invention;

in fig. 16 is a block diagram illustrating slot boundary negotiation of nodes achieving simulcast in an IAB network according to one embodiment of the present invention;

in fig. 17 is a diagram illustrating slot boundary negotiation of nodes achieving simultaneous sending and downlink data transmission slot mismatch in an IAB network according to one embodiment of the present invention;

in fig. 18 is a block diagram of a transmission timing device according to one embodiment of the present invention;

in fig. 19 is a diagram showing second structures of a transmission timing apparatus according to one embodiment of the present invention;

in fig. 20 is a diagram showing third structures of a transmission timing device according to one embodiment of the present invention; and

in fig. 21 is a block diagram of a base station according to one embodiment of the present invention.

DETAILED DESCRIPTION

Embodiments of the present invention are described in detail below in conjunction with the drawings and specific embodiments. The embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention.

First Embodiment

In FIG. 2 is a diagram showing a diagram of the basic structure of an IAB network provided in one embodiment of the present invention, and node-to-link relationships in an integrated access and transport (IAB) network is shown in FIG. 2. As shown in FIG. 2, the three nodes shown from top to bottom are respectively called the parent node, the IAB node, and the child node. The IAB node is the current node that serves as the anchor node, and the node that is above the IAB node is called the parent node. The line between the current IAB node and the parent node of the current IAB node is called a transport line. The transport link is divided into a downlink transport link (DL) and an uplink transport link (UL) with respect to the transmission direction. The line between the current IAB node and a child node of the current IAB node is called an access line. The access link is divided into DL access and UL access with respect to the direction of transmission.

The line type is determined based on the relationship and roles of the nodes. For example, if the child node in the figure is a normal terminal, then the line is the normal access line for the child node; and if the child node is an IAB node, the link is a transport link for the IAB node.

In the Rel-14 stage, the transport link and the access link of the relay node have a time separation. A particular node either sends and receives on the access line or sends and receives on the transport line.

At the Rel-16 stage, the 3rd Generation Partnership Project (3GPP) meeting discusses efficient access link and transport link multiplexing. The IAB network must support the characteristics described below.

1) Multi-hop transmission is supported, that is, a transmission consisting of more than two hops is supported. In an LTE relay network, only two hops are supported, from base station to relay to UE, while in an NR IAB network, the node following the IAB node can also be an IAB node.

2) Half duplex is supported. The IAB network does not provide that an IAB node can transmit and receive at the same time. For example, an IAB node cannot simultaneously receive and transmit in TDD mode, but the access operation is not excluded.

In the IAB network, it is necessary to standardize the maintenance of timing between the gNodeB (gNB) and the IAB node. A synchronous network is required for a TDD system and for a frequency division duplex (FDD) system, timing synchronization also provides an advantage for performing interference measurement and coordination operation.

The inter-network synchronization of the nodes can be achieved with over-the-air technology (OTA) or global positioning system (GPS) modes, and the network nodes have a unified view of the absolute times (within the error range), for example, the downstream operation is performed at the absolute time.

Due to the half-duplex communication limitation of an IAB node, an IAB node cannot send downstream data while receiving data sent by a parent node, and likewise cannot send data to a parent node while receiving data from a child node. If the prior art half-duplex transmission scheduling method is used to achieve data transmission, completing one round-trip data transmission may consume comparatively more slot resources, as shown in FIG. 3, where a three-hop network is shown as an example. As seen in FIG. 3, six portions of slot resources are consumed to maintain one transmission and feedback time of the UE. Such transmission efficiency is very low and it is difficult to allocate and use data resources.

Based on the above situation, in an embodiment of the present invention, a transmission timing method is provided. According to this method, it is considered that the multiplexing of the access link and the transport link is carried out by frequency division multiplexing (FDM) or space division multiplexing (SDM) modes to improve data transmission efficiency in the IAB network.

In an embodiment, the second node is an integrated access and transport (IAB) node, the first node is a parent node of the second node, and the third node is a child node of the second node.

In particular, as shown in FIG. 5, the transmission timing method is a method achieved mainly from the point of view of the IAB nodes. The method includes the specific steps described below.

In step S501, the transport line data sent by the parent node and the first transmission delay are received.

At this point, the bearer data includes an absolute timing event for each node's downlink data transmission. In this case, the absolute timing event is a relative concept, in particular, is a timing event for controlling the sending of downstream data of each node.

This step further includes determining a first communication delay T1 from the first node to the second node. The second node determines timing control information for controlling the transmission or reception of data of the first node or the third node according to the received first transmission delay. When the timing control information is used to achieve data send event matching, the timing information sent by the second node to the first node is a request, and the timing control information sent by the second node to the third node is timing specific adjustment information.

In an embodiment, the absolute timing event refers to a conventional absolute timing event maintained by the donor and IAB node at each layer in a network with a particular mechanism, such as a wireless (OTA) network or a GPS network, and the absolute timing event may have a certain error when provided that this error is within a certain range of errors. In other words, if nodes send data downlink, data can only be sent at such a timing event, and the node is considered to send downstream data at the same timing event, that is, at the time of the absolute timing event.

In practical application, timing events in this case refer to potential downlink transmission events. These potential events may be frames, the number of orthogonal frequency division multiplexing (OFDM) symbols, or slot boundaries, or time slots in units of the duration of one or more orthogonal frequency division multiplexing (OFDM) symbols. Downlink transmission does not require all nodes to send at the same time, that is, downlink data sending can only be performed on a potential downlink transmission event, including sending downlink control data or downlink traffic data.

In other embodiments, events when downstream data is sent are used as reference points for sending, and send operations or scheduling processes may be performed strictly on that event to achieve a offset of several units of time using these events as reference points. The offset unit may be the duration of one or more OFDM symbols.

In step S502, the second node sends timing control information for managing the data transmission event to the third node of the second node and/or the first node of the second node.

In an embodiment, after the IAB node receives the bearer data sent by the parent node, the corresponding timing control information is calculated according to the absolute timing event in the bearer data, the first transmission delay, and the transmission delay between the IAB node and the child node (which is registered in as the second transmission delay). The timing control information is mainly used to control the upstream access data transmission event of the child node with respect to the IAB node, such that the event when the IAB node receives the upstream access data from the child node and the event when the IAB node receives the downstream data sent by the parent node , are consistent with each other, and hence the multiplexing of the simultaneous reception of the uplink access data and the downlink data of the IAB node in the same event is achieved.

In addition, the uplink send event from the IAB node can be controlled to match with the downlink send event from the IAB node to the child node, so that multiplexing of simultaneous sending by the IAB node on the same event can be achieved and efficiency can be improved. data transfer and resource utilization.

In practical application, when an IAB node accesses a child node to communicate with a child node, the child node is not necessarily the node that established the radio link, but may be the node that is initially available, or may be the node that has been accessed several times. once. This step is mainly to reflect the difference between the above two cases, and the node that has been accessed multiple times is executed in step S502.

In an embodiment, it is determined whether the communication access between the second node and the third node is the initial communication access; for a node that is not available initially, the IAB node directly sends certain timing control information to the child node over the radio link, and the child node adjusts the child node's uplink data send event, that is, the access link uplink data send event, according to the received timing control information .

In an embodiment, the timing control information of the child node corresponding to the IAB node may be determined according to the first transmission delay through the modes described below.

The first transmission delay between the first node and the second node and the second transmission delay T2 between the second node and the first node are determined.

The timing offset is calculated according to the first transmission delay and the second transmission delay.

That is, in this case, the timing control information is related to a specific time unit, the same time unit is obtained by calculation, the child node sends uplink access link data to the IAB node in this time unit, and when the IAB node receives the downlink data of the transport line sent by the parent node, the IAB node at the same time receives uplink access link data sent by the child node.

In a practical application, when an IAB node receives data from a parent node and at the same time receives uplink access link data sent by a child node, the timing relation of the IAB node depends on the downlink send event and the signal propagation time (PT), and the IAB provides coordinating the timing of the upstream data of the child node and the downstream data of the parent node by adjusting the amount of advance (TA) of the child node. As shown in FIG. 9, the first transmission delay between the parent node and the IAB node is T1, and the second transmission delay (over-the-air transmission may also be referred to as the round trip delay) between the IAB node and the child node is T2. The uplink transmission timing of the child node is modified to be 2 * T2 - T1, so that the timing of the parent node's downlink transmission and the child node's uplink transmission can be matched. Thus, the IAB node can simultaneously receive two data paths, that is, the time offset is equal to twice the second transmission delay minus the first transmission delay.

In an embodiment, when the timing of the IAB node and the data transmission event of the parent node is matched with the timing control information, and the timing of the IAB node and the data transmission event of the child node is reached, two situations are possible. One situation is to achieve simultaneous reception, that is, data from the parent node and uplink access line data sent by the child node with respect to the IAB node are received simultaneously; another situation is to achieve simultaneous sending, that is, upstream data is sent to the parent node and downstream data is sent to the child node of the IAB node at the same time, as shown in FIG. four.

In an embodiment, for a situation where data from a parent node and uplink data of an access line sent by a child node are simultaneously received, there are two negotiation modes, i.e., negotiation according to slot boundaries and negotiation according to symbols.

If the timing control information is used to control the timing of the uplink data reception event of the second node from the third node and the downstream data reception event of the second node from the first node, that is, if the simultaneous reception of data from the parent node and uplink data of the access line sent by the child nodes are coordinated with each other according to interval boundaries, the timing control for the uplink data reception event by the second node from the third node and the downstream data reception event by the second node from the first node includes one of the modes described below.

The reception interval of the IAB node receiving the access data sent by the child node is timed with the reception interval of the IAB node receiving the bearer data sent by the parent node per unit of time by the timing adjustment command mode TA2.

The reception interval of the IAB node receiving the access data sent by the child node and the reception interval of the IAB node receiving the bearer data sent by the parent node are configured by the f1-AP interface mode between the centralized unit and the distributed unit or the radio resource control (RRC) signaling information sending mode ), and the receive interval of the IAB node receiving the access data sent by the child node is timed with the receive interval of the IAB node receiving the bearer data sent by the parent node per unit of time.

The reception interval of the IAB node receiving the access data sent by the child node is matched with the reception interval of the IAB node receiving the bearer data sent by the parent node per unit of time by the operation, management, and maintenance (OAM) background configuration mode.

These control modes can be achieved in the forms described below.

The parent node is able to match the uplink access link reception timing (UA RX) of the IAB node with the downlink data transport link (DB RX) reception timing in a certain unit of time through the timing adjustment command TA2.

The parent node allows the timing of the UA RX of the IAB node to be matched with the timing of the DB RX in a specific unit of time via a configuration mode, such as f1-AP configuration or RRC signaling information.

The timing of the UA RX of the IAB node is matched to the timing of the DB RX in a specific unit of time via the OAM background configuration mode.

The IAB node allows the timing of the UA RX of the IAB node to be matched to the timing of the DB RX in a certain unit of time by means of a timing adjustment command TA2.

The IAB node is able to match the child node UA RX timing with the DB RX timing in a certain unit of time via a configuration mode such as f1-AP configuration or RRC signaling information.

The specific time unit described above may be the number of OFDM symbols or slots, or a combined time unit including one or more OFDM symbols or one or more slots.

In an embodiment, the negotiation may also be achieved in the symbol negotiation mode. For the symbol matching mode, data transmission is determined to be at least one backward or forward OFDM symbol, that is, the time offset is the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols.

If the timing control information is used to control the timing of the uplink reception event of the second node from the third node and the timing of the downstream reception event of the second node from the first node, after calculating the time offset, the timing of the timing according to the first transmission delay and the second transmission delay are performed the steps described below.

At least one OFDM symbol is read before the IAB node transitions to a data receive state.

Calculating the timing offset according to the first transmission delay and the second transmission delay includes the step described below.

The number of OFDM symbols to be actually adjusted according to the first transmission delay and/or the second transmission delay and the duration of one OFDM symbol is determined.

At this time, timing control for the uplink data reception event by the second node from the third node and downlink data reception timing by the second node from the first node can be achieved by one of the modes described below.

The timing of receiving access data sent by the child node by the IAB node is adjusted to be shifted forward or backward by the duration of N OFDM symbols relative to the timing of sending data of the transport link by the parent node, through the mode of the timing adjustment command TA2; and N is greater than or equal to 1.

Timing of receipt by the IAB node of the access data sent by the child node is adjusted by the interface mode between the centralized unit and the distributed unit or RRC signaling information sending mode, and timing of the receipt by the IAB node of the access data sent by the child node is adjusted to be biased forward or backward by a duration of N OFDM symbols relative to the parent node's transport link data sending timing.

The IAB node's timing of receipt of access data sent by the child node is adjusted to be shifted forward or backward by a duration of N OFDM symbols relative to the timing of sending backlink data by the parent node through the Operation, Management, and Maintenance Background Configuration Mode (OAM) .

In other words, one OFDM symbol preceding the send event received by the IAB node is still used to receive data, and the IAB node schedules the uplink send time of the child node with a forward bias, so that the time when the IAB node receives the child node is forward biased. per OFDM symbol compared to the time the IAB node receives the parent node.

The number of symbols that actually need to be shifted forward may be determined according to the propagation delay and the duration of the OFDM symbol. For example, the signal propagation time is PT, the OFDM symbol duration is the maintenance time (TOS), so that the number of forward-shifted OFDM symbols is equal to a function of ceil (PT/TOS), specifically, as shown in FIG. 9.

In addition, in embodiments, the parent node's received data matches the child node's received data according to symbols, but the child node's received data is shifted forward by one OFDM symbol relative to the parent node.

In addition, if multiple OFDM symbols in the downlink transmission event received by the IAB can be used for uplink reception, the IAB node can further advance the uplink send time, i.e., the solution does not limit the uplink receive timing to a single symbol. OFDM shifted forward.

Likewise, if several OFDM symbols in the next downlink send event received by the IAB can be used for uplink reception, the IAB node can push back the uplink send time.

The IAB node informs the next node that the uplink send time is shifted back for several events, the number of OFDM symbols pushed back is the number of OFDM symbols corresponding to a certain unit of time minus the number of OFDM symbols corresponding to the duration to be shifted forward, and N OFDM symbols shifted back is a fixed unit of time minus the number of OFDM symbols to be shifted forward.

A specific unit of time described herein is the number of OFDM symbols or the number of OFDM symbols corresponding to a transmission interval or short transmission time interval (TTI).

These control modes can be achieved in the forms described below.

The parent node allows the UA RX timing of the IAB node to be shifted forward or backward by several OFDM symbols duration relative to the timing of the DB RX via the timing adjustment command TA2.

The parent node allows the UA RX timing of the IAB node to be offset forward or backward by several OFDM symbols duration relative to the DB RX timing via a configuration mode such as f1-AP or RRC signaling information.

The UA RX timing of the IAB node should be shifted forward or backward by a few OFDM symbol duration relative to the DB RX timing via the background OAM configuration mode.

The IAB node allows the timing of the UA RX of the IAB node to be shifted forward or backward by several OFDM symbols duration relative to the timing of the DB RX via the timing adjustment command TA2.

The IAB node allows the UA RX timing of the IAB node to be offset forward or backward by several OFDM symbols duration relative to the DB RX timing via a configuration mode such as f1-AP or RRC signaling information.

The UA RX timing of the child node is shifted forward by a duration of several OFDM symbols relative to the timing of the DB RX via the prenegotiation mode.

The number of forward-shifted OFDM symbols in prenegotiation mode is related to network coverage. For example, in the transmission-distance condition 1, the duration of N1 OFDM symbols is forward shifted, in the transmission-distance condition 2, the duration of N2 OFDM symbols is forward shifted, and in the transmission-distance condition 3, the duration of N3 OFDM symbols is forward shifted.

The transmission-distance conditions are classified according to the transmission distances, and the corresponding order assumes that the distance in the transmission-distance condition 1 is smaller than the distance in the transmission-distance condition 2, which is smaller than the distance in the transmission-distance condition 3; and the optional N1 value is 1, the optional N2 value is 1 and 2, and the optional N3 value is 2 and 3. It should be noted that the classification mode described herein is only for illustrating the selection of a pre-agreed value, and the specific number and mutual order these conditions are not limited in the embodiment.

In an embodiment, if the communication access between the second node and the third node is an initial access communication, the method further includes the following: the IAB node sends to the child node, via the system information broadcast mode, the timing control information and the signal format for the initial access.

In addition, the timing control information contains a fixed amount time offset or a data format strategy for adjusting the child node.

The timing control for the uplink data receive event by the second node from the third node and the downstream data receive event by the second node from the first node includes the following: the data sent by the child node is adjusted into the receive window where the IAB node receives data from the parent node, according to the time offset or strategies.

The data format strategy for adjusting a child node includes the steps described below.

The duration of the cyclic data prefix of the child node is increased according to the difference between the first transmission delay and the second transmission delay between the IAB node and the child node.

Alternatively, a guard interval is added before the cyclic data prefix of the child node according to the difference between the first transmission delay and the second transmission delay between the IAB node and the child node.

In an embodiment, when sending upstream data to the parent node and sending downstream data to the child node with respect to the IAB node are simultaneously achieved, due to the presence of a propagation delay, there is a deviation between the event when the IAB node sends upstream data to the parent node and the send event on descending line. Therefore, in an embodiment of the present invention, a request is sent to the parent node via the IAB node to match the uplink timing event with the downlink timing event.

The response message sent by the parent node according to the request is received, and the number of OFDM symbols to shift forward with respect to the uplink data transmission timing according to the first transmission delay and the absolute downstream data transmission timing event of the IAB node is determined.

The uplink timing event is adjusted according to the number of OFDM symbols to be shifted forward.

In practical application, matching adjustment can be achieved in two modes, described below. The two modes are based on data structure changes, specifically as shown in FIG. 12.

In one send structure, a portion of the unit of time is sent. For example, one or more OFDM symbols are shifted forward on an IAB node uplink send event scheduled by the parent node, and a certain unit of time is reserved to prevent collision between uplink send to the parent node and uplink receive.

In another dispatch structure, the parent node schedules the entire unit of time. For example, if the IAB node's signaling time is very short and one or more OFDM symbols are not forward biased when the IAB node sends data to the parent node, the IAB node may send the entire unit of time.

The parent node backshifts a certain number of OFDM symbols per IAB node uplink send, which corresponds to the third send data structure.

According to the transmission timing method provided in the embodiment, the second node sends timing control information to the first node and/or the third node to control the matching of the second node's reception event of the data sent by the first node and the second node's reception event of the data sent by the third node, or managing the negotiation of a send data event by the second node to the first node and a send data event by the second node to the third node, so that the IAB node can simultaneously receive data from the parent node and data from the child node, or can simultaneously send data to the parent node and send data to the child node. Thus multiplexing of the node handover event is achieved, the data transmission efficiency of the IAB network is improved, the utilization of allocated resources is also improved, the UE requirements are better met, and the user experience is improved. The solution has a simple implementation and is applicable in many scenarios. The solution will be promoted internationally as a potential 5G standard and has significant market value.

Second Embodiment

In FIG. 6 shows a transmission timing method provided in an embodiment of the present invention. The method is mainly focused on the parent node of the IAB node, and the method includes certain processing steps, described below.

In step S601, transport link data is generated according to communication with the IAB node.

In step S602, the transport link data is sent to an integrated access and transport (IAB) node via a radio link.

In this step, the transport link data is used to determine the timing control information of the child node corresponding to the IAB node. The timing control information is used to control the timing negotiation for the IAB node and the data transfer event between the IAB node and the child node, and the bearer link data includes an absolute downlink data transfer timing event for each node. At this point, the IAB node must also determine the first transmission delay for the IAB node to receive bearer link data.

In an embodiment, if the IAB node achieves multiplexing of simultaneous reception of data from the parent node and uplink data of the access line sent by the child node with respect to the IAB node, the parent node transmits timing control information to determine the child node corresponding to the IAB node, and the IAB base station adjusts the uplink data send event by the child node according to the timing control information.

If sending upstream data to the parent node and sending downstream data to the child node with respect to the IAB node are simultaneously achieved, the parent node must additionally accept the negotiation request sent by the IAB node. The negotiation request is a request to negotiate the uplink data transmission timing event of the IAB node and the downstream data transmission timing event.

The agreed unit of time is determined according to the agreement request, and a response message containing the agreed unit of time is sent to the IAB node.

In practical application, the parent node response message includes a matching situation according to the number of OFDM symbols or slots corresponding to the index, and includes full negotiation or up or down timing adjustment based on the number of OFDM symbols or slot boundaries. The adjustment amount is the duration of an OFDM symbol, and may be a duration corresponding to one or more OFDM symbols.

In an embodiment, the parent node can also achieve receiving data from the parent node and the child node on the same event reached by the IAB node by transmitting the above data, so that node transmission event multiplexing is achieved. Thus, the transmission efficiency of the IAB network is improved, the utilization rate of allocated resources is also improved, the UE requirement is better met, and the user experience is improved. The solution has a simple implementation and is applicable in many scenarios. The solution will be promoted internationally as a potential 5G standard and has significant market value.

Third Embodiment

In FIG. 7 shows the other end transmission timing method provided in the embodiment of the present invention. The method is mainly applied to multiplexing and scheduling at a child node of an IAB node. In an embodiment, the second node is an IAB node, the first node is a parent node of the second node, and the third node is a child node of the second node.

The method includes the steps described below.

In step S701, timing control information sent by the second node is received.

At this point, the bearer data includes a downlink absolute data transmission timing event of each node and a first transmission timing delay between the parent node and the IAB node. The timing control information is used to control the matching of the data transmission event of the child node corresponding to the IAB node and the data transmission event received by the IAB node from the parent node.

In particular, the transport line data at this stage is the transport line data received by the IAB node from the parent node. The IAB node forwards the bearer data to the child node along with the timing control information.

In step S702, the uplink data reception event sent by the third node to the second node is timed with the downstream data reception event by the second node from the first node according to the timing control information.

In an embodiment, the child node negotiation adjustment includes two negotiation modes, ie, negotiation according to interval boundaries and negotiation according to symbols.

If the matching is achieved according to the slot boundaries, that is, the timing control information is a unit of time, the timing control information controlling the matching of the data transmission event of the child node corresponding to the IAB node and the data transmission event received by the IAB node from the parent node includes one of modes described below.

The reception interval of the IAB node receiving the access data sent by the child node is timed with the reception interval of the IAB node receiving the bearer data sent by the parent node per unit time by the timing adjustment command mode TA2.

The reception interval of the IAB node receiving the access data sent by the child node and the reception interval of the IAB node receiving the transport line data sent by the parent node are configured by the interface mode between the centralized unit and the distributed unit or the RRC signaling information sending mode, and the reception interval of the IAB node , receiving the access data sent by the child node, is timed with the receive interval of the IAB node receiving the transport link data sent by the parent node per unit of time.

The time unit described herein is the number of OFDM symbols or the number of OFDM symbols corresponding to an interval or a short TTI.

The reception interval of the IAB node receiving the access data sent by the child node is matched with the reception interval of the IAB node receiving the bearer data sent by the parent node per unit of time through the Operation, Management, and Maintenance Background Configuration Mode (OAM).

If matching is achieved according to the symbols, that is, if the timing control information is the number of OFDM symbols, timing for the uplink data reception event sent by the third node to the second node with the downstream data reception event of the second node from the first node according to the timing control information includes one of the modes described below.

The timing of receiving access data sent by the child node by the IAB node is adjusted to be shifted forward or backward by the duration of N OFDM symbols relative to the timing of sending the transport link data by the parent node, by the timing adjustment command mode TA2; and N is greater than or equal to 1.

Shifting back N OFDM symbols may mean that the first N symbols in one unit of time do not transmit data, and subsequent symbols of the corresponding OFDM sequence number send data. For example, one unit of time includes m OFDM symbols, and if 3 symbols are reported to be shifted back to send, the child node transmits data according to the format corresponding to symbols with sequence numbers from 4 to m.

In addition, N OFDM symbols can be shifted back by the number of OFDM symbols corresponding to a certain unit of time minus the number of OFDM symbols calculated above to be shifted forward, and hence the transmission event is shifted back. It is assumed that the number of OFDM symbols in one unit of time is 14, and the number N of forward symbols is 1 according to the above calculation, so that the number of OFDM symbols to be shifted back is 13. The data sending format after the backshift is transmitted as a complete transmission units according to a specific unit of time. In other words, the transmission is carried out according to the formats corresponding to the characters with a sequence number from 1 to m.

The IAB node's receiving timing of the access data sent by the child node is adjusted by the interface mode between the centralized unit and the distributed unit or the RRC signaling information sending mode, and the timing of the receipt by the IAB node of the access data sent by the child node is adjusted to be biased forward or backward by a duration of N OFDM symbols relative to the parent node's transport link data sending timing.

The IAB node's reception timing of the access data sent by the child node is adjusted to be shifted forward or backward by N OFDM symbol duration relative to the parent node's transport link data sending timing via Operation, Management, and Maintenance Background Configuration Mode (OAM) .

In an embodiment, the adjustment of the timing for the uplink data send event of the child node's access line is achieved by the methods described above, and it is achieved that the IAB node receives data from the parent node and the child node or sends data to them on the same event, so that node transfer event multiplexing. Thus, the transmission efficiency of the IAB network is improved, the utilization rate of allocated resources is also improved, the UE requirement is better met, and the user experience is improved. The solution has a simple implementation and is applicable in many scenarios. The solution will be promoted internationally as a potential 5G standard and has significant market value.

Fourth Embodiment

The transmission timing method provided in the embodiment of the present invention is described in detail below in conjunction with specific application scenarios. In particular, the structure of the IAB network shown in FIG. 2 is taken as an example for description.

In an embodiment, it is achieved that the IAB node simultaneously receives data from the parent node and the uplink access line data sent by the child node with respect to the IAB node, and negotiation is achieved according to the slot boundaries.

In FIG. 2 shows a parent node, an IAB node, and a child node. The parent node is the parent node of the IAB node. The IAB node transmits transport link data to the parent node over the radio link, the child node is a slave link of the IAB node, and the IAB node transmits transport data or access link data to the child node over the radio link. The choice of transmission of the access line or transport line depends on the type of child node. In this case, the child node is selected as the general type of the terminal UE for description. It is assumed that the IAB node simultaneously receives data sent by the parent node and data sent by the child node.

As shown in FIG. 8A, the IAB donor node and the IAB node network at each layer maintain a common absolute timing event (within the error band). This joint timing can be achieved through mechanisms such as OTA or GPS. If these nodes send data to a child node, the data is sent with this timing event as the reference point. The reference point is called the downlink send event. In FIG. 8A DL TX are downlink.

These downlink transmission events refer to potential downlink transmission events, which may be frames, number of OFDM symbols, or slot boundaries, or time slots in units of the duration of multiple OFDM symbols. For a downlink send event, it is not necessary for all nodes to send on this event, but downlink data can only be sent on a potential downlink transmission event. Downstream data includes downstream control data or downstream traffic data.

These downlink send events may serve as reference points for downlink send, and the IAB node or donor node may perform send operations or scheduling processes strictly on that event to achieve multi-slot offset by taking these events as reference points. The unit of slot offset may be the duration of one or more OFDM symbols. This time slot offset may be implemented as TA adjustment scheduling as shown in FIG. 8B.

When an IAB node receives data from a parent node, the timing relationship of the IAB node depends on the downlink send event and the signal propagation time (PT), and the IAB ensures the timing of the upstream data of the child node and the downstream data of the parent node by adjusting the TA value of the child node . In the figure, the signaling delay between the parent node and the IAB node is T1, the signaling delay between the IAB node and the child node is T2, and the parent node's downlink sending timing and the child node's uplink sending timing matching can be achieved under the condition that the child node's uplink timing is modified to 2 * T2 - T1 so that the IAB node can receive two data paths simultaneously.

In FIG. 9, in the embodiment, the relationship of data transmission timing to achieve simultaneous data reception in the IAB network structure shown in FIG. 2. If the parent node sends data to the child node, the downstream data is indicated by the left dotted line 1, and the downlink transmission of the IAB node in the figure takes the time point marked by the dotted line 1 as a potential event for sending downstream data. Since the IAB node is limited to half-duplex communication, if the parent node sends downstream data to the IAB node on a downlink send event, the IAB receives the downstream data without performing a send data operation. In FIG. 9 DL TX represents downlink transmission; DB RX represents downlink reception; DA TX represents downlink access transmission; UA RX represents uplink access access; DA RX represents downlink access; RX represents receive; TX represents transmission.

Therefore, if the TA adjustment according to the prior art is performed, the timings when the IAB receives the data of the two lines do not match. As shown in FIG. 9, the timing of the two receptions shown by the double arrow is not consistent, and furthermore, the uplink data transmitted from the child node to the IAB node may come from multiple nodes, so that it is difficult for the IAB node to simultaneously receive different lines.

Timing adjustment is performed according to at least one of the modes described below.

The parent node allows the timing of the UA RX of the IAB node to be matched with the timing of the DB RX in a specific unit of time via the timing adjustment command TA2.

The parent node allows the timing of the UA RX of the IAB node to be matched with the timing of the DB RX in a specific unit of time via a configuration mode such as f1-AP or RRC signaling information.

The timing of the UA RX of the IAB node is matched to the timing of the DB RX in a specific unit of time via the OAM background configuration mode.

The IAB node allows the timing of the UA RX of the IAB node to be matched to the timing of the DB RX in a certain unit of time by means of a timing adjustment command TA2.

The IAB node allows child node UA RX timing to match DB RX timing in a specific unit of time via a configuration mode such as f1-AP or RRC signaling information.

The specific time unit described above may be the number of OFDM symbols or slots, or a combined unit of time including multiple OFDM symbols or multiple slots.

With the above-described adjustment, the downstream data is adjusted according to the time reference point marked by the dotted line 2, which is taken as a potential event for sending the downstream data. After the transmission delay, the timing event received by the IAB node only matches the receive event of the IAB node receiving downstream data sent by the parent node, so that the IAB node can simultaneously receive data sent by the parent node and data sent by the child node.

Fifth Embodiment

In an embodiment, it is achieved that the IAB node simultaneously receives data from the parent node and the uplink access line data sent by the child node with respect to the IAB node, and matching is achieved according to symbols.

In FIG. 2 shows a parent node, an IAB node, and a child node. The parent node is the parent node of the IAB node. The IAB node transmits transport link data to the parent node over the radio link, the child node is a slave link of the IAB node, and the IAB node transmits transport data or access link data to the child node over the radio link. The choice of transmission of the access line or transport line depends on the type of child node. It is assumed that the IAB node simultaneously receives data sent by the parent node and data sent by the child node.

As shown in FIG. 8A, the IAB donor node and the IAB node network at each layer maintain a common absolute timing event (within the error band). This joint timing can be achieved through mechanisms such as OTA or GPS. If these nodes send data to a child node, the data is sent with this timing event as the reference point. The reference point is called the downlink send event.

These downlink transmission events refer to potential downlink transmission events, which may be frames, number of OFDM symbols, or slot boundaries, or time slots in units of the duration of multiple OFDM symbols. For a downlink send event, it is not necessary for all nodes to send on this event, but downlink data can only be sent on a potential downlink transmission event. Downstream data includes downstream control data or downstream traffic data.

These downlink send events may serve as reference points for downlink send, and the IAB node or donor node may perform send operations or scheduling processes strictly on that event to achieve multi-slot offset by taking these events as reference points. The unit of slot offset may be the duration of one or more OFDM symbols. This time slot offset may be implemented as TA adjustment scheduling as shown in FIG. ten.

When an IAB node receives data from a parent node, the timing relationship of the IAB node depends on the downlink send event and the signal propagation time (PT), and the IAB ensures the timing of the upstream data of the child node and the downstream data of the parent node by adjusting the TA value of the child node . In the figure, the first transmission delay between the parent node and the IAB node is T1, the second transmission delay between the IAB node and the child node is T2, and the timing of the parent node's downlink sending and the child node's uplink sending timing can be matched under the condition that the child node's uplink timing is modified to 2 * T2 - T1 so that the IAB node can receive two data paths simultaneously.

In an embodiment, the OFDM symbol that precedes the receipt of the IAB node of the send event is still used to receive data, and the IAB node schedules the uplink transmission time of the child node with a forward offset, so that the time that the IAB node receives the child node is forward-shifted by one OFDM symbol compared to the time the IAB node receives the parent node.

The number of symbols that actually need to be shifted forward may be determined according to the propagation delay and the duration of the OFDM symbol. For example, the signal propagation time is PT, the OFDM symbol duration is TOS, so the number of forward-shifted OFDM symbols is a function of ceil (PT/TOS).

In FIG. 10, in the embodiment, the relationship of data transmission timing to achieve simultaneous data reception in the IAB network structure shown in FIG. 2. If the parent node sends data to the child node, the downstream data is indicated by the left dotted line, and the downlink transmission of the IAB node in the figure takes the time reference marked by the dotted line as a potential event for sending downstream data. Since the IAB node is limited to half-duplex communication, if the parent node sends downstream data to the IAB node on a downlink send event, the IAB receives the downstream data without performing a send data operation.

If the TA adjustment according to the prior art is performed, the times when the IAB receives the data of the two lines do not match. As shown in FIG. 10, the timing of the two receptions shown by the double arrow is not consistent, and furthermore, the uplink data transmitted from the child node to the IAB node may come from multiple nodes, so that it is difficult for the IAB node to simultaneously receive different lines.

In an embodiment, the IAB node is able to match the received data of the parent node with the received data of the child node according to symbols, but the received data of the child node is one OFDM symbol earlier than the received data of the parent node.

In addition, if multiple OFDM symbols in the downlink transmission event received by the IAB can be used for uplink reception, the IAB node can further advance the uplink send time, i.e., the solution does not limit the uplink receive timing to a single symbol. OFDM shifted forward.

Likewise, if several OFDM symbols in the next downlink send time received by the IAB can be used for uplink reception, the IAB node can skew back the uplink send time, as shown in FIG. eleven.

Similarly, this solution does not restrict uplink reception timing to a single backshifted OFDM symbol.

Timing adjustment is performed according to at least one of the modes described below.

The parent node allows the UA RX timing of the IAB node to be shifted forward or backward by several OFDM symbols duration relative to the timing of the DB RX via the timing adjustment command TA2.

The parent node allows the UA RX timing of the IAB node to be offset forward or backward by a few OFDM symbols duration relative to the DB RX timing via a configuration mode such as f1-AP configuration or RRC signaling information.

The UA RX timing of the IAB node must be shifted forward or backward by a few OFDM symbol duration relative to the timing of the DB RX of the IAB node by the background OAM configuration mode.

The IAB node allows the UA RX timing of the IAB node to be shifted forward or backward by several OFDM symbols duration relative to the DB RX timing by means of a timing adjustment command TA2.

The IAB node allows the UA RX timing of the IAB node to be shifted forward or backward by a few OFDM symbols duration relative to the DB RX timing via a configuration mode such as f1-AP configuration or RRC signaling information.

The child node's UA RX timing is shifted forward by several OFDM symbol duration relative to the DB RX timing by the prenegotiation mode.

The number of forward-shifted OFDM symbols in prenegotiation mode is related to network coverage. For example, in the transmission-distance condition 1, the duration of N1 OFDM symbols is forward shifted, in the transmission-distance condition 2, the duration of N2 OFDM symbols is forward shifted, and in the transmission-distance condition 3, the duration of N3 OFDM symbols is forward shifted.

The transmission-distance conditions are classified according to the transmission distances, and the corresponding order assumes that the distance in the transmission-distance condition 1 is smaller than the distance in the transmission-distance condition 2, which is smaller than the distance in the transmission-distance condition 3; and the optional value N1 is 1, the optional value N2 is 1 and 2, and the optional value N3 is 2 and 3.

The above classification mode is only for illustrating the selection of a pre-agreed value, and the specific number and mutual order of these conditions are not limited in the embodiment.

The adjustment described above regulates the potential event of sending downstream data. After the transmission delay, the timing event received by the IAB node only matches the receive event of the IAB node receiving downstream data sent by the parent node, so that the IAB node can simultaneously receive data sent by the parent node and data sent by the child node.

Sixth Embodiment

In an embodiment of the present invention, when an IAB node accesses a child node of an IAB node for communication, the child node is not necessarily the node that established the radio link, but may be the node that is initially available, or may be the node to which access has been obtained several times. The fourth embodiment and the fifth embodiment illustrate a node that has been accessed multiple times. For a node that is initially available, the first data transfer must be in broadcast mode. The structure of the IAB network shown in FIG. 2 is still used for illustration below.

In FIG. 2 shows a parent node, an IAB node, and a child node. The parent node is the parent node of the IAB node. The IAB node transmits transport link data to the parent node over the radio link, the child node is a slave link of the IAB node, and the IAB node transmits transport data or access link data to the child node over the radio link. The choice of transmission of the access line or transport line depends on the type of child node. It is assumed that the IAB node simultaneously receives data sent by the parent node and data sent by the child node.

As shown in FIG. 8A, the donor node and the IAB node network at each layer maintain a common absolute timing event (within the error band). This joint timing can be achieved through mechanisms such as OTA or GPS. If these nodes send data to a child node, the data is sent with this timing event as the reference point. The reference point is called the downlink send event.

These downlink transmission events refer to potential downlink transmission events, which may be frames, number of OFDM symbols, or slot boundaries, or time slots in units of the duration of multiple OFDM symbols. For a downlink send event, it is not necessary for all nodes to send on this event, but downlink data can only be sent on a potential downlink transmission event. Downstream data includes downstream control data or downstream traffic data.

These downlink send events may serve as reference points for downlink send, and the IAB node or donor node may perform send operations or scheduling processes strictly on that event to achieve multi-slot offset by taking these events as reference points. The unit of slot offset may be the duration of one or more OFDM symbols.

In an embodiment, the IAB node receives downstream traffic data and control data sent by the parent node and upstream access signals sent by the child node.

In FIG. 12 describes the timing relationship of data transmission to achieve simultaneous data reception in the network structure shown in FIG. 2. If the parent node sends data to the child node, the downstream data is indicated by the left dotted line, and the downlink transmission of the IAB node in the figure takes the time reference marked by the dotted line as a potential event for sending downstream data. Since the IAB node is limited to half-duplex communication, if the parent node sends downstream data to the IAB node on a downlink send event, the IAB receives the downstream data without performing a send data operation. DLRX in FIG. 12 represents downlink reception.

There may be a relatively large difference in signal propagation time between nodes. The signal propagation delay between the parent node and the IAB node is large, as shown in FIG. 12, but the narrow line-of-sight beam between the parent node and the IAB node ensures high link quality. However, the signal propagation delay between the IAB node and the child node with respect to the IAB node can be relatively small and the signal propagation delay depends on the distance between the IAB node and the child node. It is assumed that T1 > 2T2 + CP in FIG. 12 so that the entire uplink access signal sent by the child node cannot fit within the receive window of the IAB node, as indicated by the double dotted arrow in FIG. 12.

In an embodiment, since the connection is not established, the child node, which is the initial access point and accesses the IAB network, cannot receive timing advance, and therefore the access node needs to be made aware of the signal delay experienced by the IAB node in broadcast mode. The broadcast mode includes a system information block (SIB) mode or a master information block (MIB) mode.

In another embodiment, a relatively conservative value may further be provided by the prenegotiation mode such that the upstream access signal sent by the child falls within the receive window of the IAB node. As is known from the second group of the UA RX reception time sequence of the IAB node shown in FIG. 12, the uplink access signal sent by the child node falls within the signal reception window of the IAB node.

Seventh Embodiment

In an embodiment of the present invention, for a node that is natively available, timing of the transmission event is achieved by the method described above, and timing of the transmission event can also be achieved by changing the uplink transmission data format. In particular, two modes can be provided as described below.

The duration of the cyclic data prefix of the child node is increased according to the difference between the first transmission delay and the second transmission delay between the IAB node and the child node.

A guard interval is added before the cyclic data prefix of the child node according to the difference between the first transmission delay and the second transmission delay between the IAB node and the child node.

The structure of the IAB network shown in FIG. 2 is still used for illustration below.

In FIG. 2 shows a parent node, an IAB node, and a child node. The parent node is the parent node of the IAB node. The IAB node transmits transport link data to the parent node over the radio link, the child node is a slave link of the IAB node, and the IAB node transmits transport data or access link data to the child node over the radio link. The choice of transmission of the access line or transport line depends on the type of child node. It is assumed that the IAB node simultaneously receives data sent by the parent node and data sent by the child node.

As shown in FIG. 8A, the donor node and the IAB node network at each layer maintain a common absolute timing event (within the error band). This joint timing can be achieved through mechanisms such as OTA or GPS. If these nodes send data to a child node, the data is sent with this timing event as the reference point. The reference point is called the downlink send event.

These downlink transmission events refer to potential downlink transmission events, which may be frames, number of OFDM symbols, or slot boundaries, or time slots in units of the duration of multiple OFDM symbols. For a downlink send event, it is not necessary for all nodes to send on this event, but downlink data can only be sent on a potential downlink transmission event. Downstream data includes downstream control data or downstream traffic data.

These downlink send events may serve as reference points for downlink send, and the IAB node or donor node may perform send operations or scheduling processes strictly on that event to achieve multi-slot offset by taking these events as reference points. The unit of slot offset may be the duration of one or more OFDM symbols.

In an embodiment, the IAB node receives downstream traffic data and control data sent by the parent node and upstream access signals sent by the child node.

In FIG. 13 describes the timing relationship of data transmission to achieve simultaneous data reception in the network structure shown in FIG. 2. If the parent node sends data to the child node, the downstream data is indicated by the left dotted line, and the downlink transmission of the IAB node in the figure takes the time reference marked by the dotted line as a potential event for sending downstream data. Since the IAB node is limited to half-duplex communication, if the parent node sends downstream data to the IAB node on a downlink send event, the IAB receives the downstream data without performing a send data operation.

There may be a relatively large difference in signal propagation time between nodes. The signal propagation delay between the parent node and the IAB node is large, as shown in FIG. 13, but the narrow line-of-sight beam between the parent node and the IAB node ensures high link quality. However, the signal travel time between the IAB node and the child node with respect to the IAB node may be relatively short, and the signal travel time depends on the distance between the IAB node and the child node. The figure assumes that T1 > 2T2 + CP so that the entire uplink access signal sent by the child node cannot fit within the receive window of the IAB node, as indicated by the double dotted arrow in FIG. 13.

In an embodiment, since the connection is not established, the child node, which is the initial access point and accesses the IAB network, cannot receive the timing advance. By designing the uplink access signal, ie the new uplink data format, the uplink access signal sent by the child node falls within the receive window of the IAB node. A comparison of the format and the uplink access signal according to the prior art is shown in FIG. fourteen.

Two proposals for improving prior art solutions are shown in FIG. fourteen.

The new format 1 introduces a longer CP. This design can accommodate a larger travel time variance between an IAB node and a child node. In particular, the CP length increase may be set according to two given transmission delay deviation values. For example, the maximum signal travel time between an IAB node and a donor node is given as T1_Max, the minimum signal travel time between an IAB node and a child node is given as T2_Min, and the signal travel time difference T_diff between the IAB node and the child node corresponds to the equation T_diff = T1_Max - T2_Min. The amount of increase in the length of the CP is T_diff.

In the new format 2, an additional guard time (GT) is added based on the original access signal. This format can allow a certain amount of travel time difference, and can also prevent interference affecting the previous transmission block. For example, the previous transmission block is the IAB node and its operation is not completely interrupted by a send data event (such as bearer data), and the uplink access signal sent by the child node causes interference affecting the sending of data by the IAB node.

By implementing a new uplink access signal format, the access signal sent by the child node and the downstream traffic data and/or control data sent by the parent node are within the same receive time sequence in order to achieve efficient access link and transport link multiplexing. lines.

Eighth Embodiment

In an embodiment of the present invention, in addition to achieving a situation in which the IAB node simultaneously receives data from the parent node and uplink access line data sent by the child node with respect to the IAB node, it is also achieved that the IAB node simultaneously sends uplink data to the parent node and downstream data to a child node of the IAB node, so that multiplexing of the simultaneous sending of data by the IAB node is achieved.

In FIG. 2 shows a parent node, an IAB node, and a child node. The parent node is the parent node of the IAB node. The IAB node transmits transport link data to the parent node over the radio link, the child node is a slave link of the IAB node, and the IAB node transmits transport data or access link data to the child node over the radio link. The choice of transmission of the access line or transport line depends on the type of child node. It is assumed that the IAB node simultaneously receives data sent by the parent node and data sent by the child node.

As shown in FIG. 8A, the donor node and the IAB node network at each layer maintain a common absolute timing event (within the error band). This joint timing can be achieved through mechanisms such as OTA or GPS. If these nodes send data to a child node, the data is sent with this timing event as the reference point. The reference point is called the downlink send event.

These downlink transmission events refer to potential downlink transmission events, which may be frames, number of OFDM symbols, or slot boundaries, or time slots in units of the duration of multiple OFDM symbols. For a downlink send event, it is not necessary for all nodes to send on this event, but downlink data can only be sent on a potential downlink transmission event. Downstream data includes downstream control data or downstream traffic data.

These downlink send events may serve as reference points for downlink send, and the IAB node or donor node may perform send operations or scheduling processes strictly on that event to achieve multi-slot offset by taking these events as reference points. The unit of slot offset may be the duration of one or more OFDM symbols.

In an embodiment, the IAB node sends appropriate control information, such as uplink traffic measurement and/or feedback, to the parent node while simultaneously sending downlink control and/or control information to the child node.

The choice of when the IAB node sends data to the parent node is determined by the parent node. Due to the presence of signal propagation delay, there is a deviation between the event when the IAB node sends upstream data to the parent node and the send event on the downlink. The capability ratio is indicated by the dotted double arrow in FIG. fifteen.

In FIG. 15, the timing indicated by UB TX with the new TA of the IAB node is consistent with the timing of the downlink send event, and the send structure is shown in the figure. UB TX represents transmission on the uplink transport link.

In one send structure, a portion of a unit of time is sent. For example, one or more OFDM symbols are shifted forward on an IAB node uplink send event scheduled by the parent node, and a certain unit of time is reserved to prevent collision between uplink send to the parent node and uplink receive.

In another dispatch structure, the parent node schedules the entire unit of time. For example, if the IAB node's signaling time is very short and one or more OFDM symbols are not forward biased when the IAB node sends data to the parent node, the IAB node may send the entire unit of time.

To achieve simultaneous sending of data by the IAB node to the parent node and the child node, the mechanism shown in FIG. 16.

As shown in FIG. 16, in order for the IAB node to perform frequency division multiplexing (FDM) or space division multiplexing (SDM) on the child node and the parent node, the IAB node makes an uplink and downlink negotiation request from the parent node. In addition, the request information includes sending a time unit negotiation request. The time unit includes an index of the number of OFDM symbols, or an index of slots, or an index of intra-slot OFDM symbols. The intra-slot symbol index turns on the bit-indication mode or indicates the index of the original OFDM symbol and the number of OFDM symbols constituting the duration.

Upon receiving the negotiation request, the parent node determines whether to perform adjustment according to the unit of time requested by the IAB node. If the unit of time for the negotiation requested by the IAB node is an ordinal number of OFDM symbols or an ordinal number of slots, the response information of the parent node includes a negotiation situation according to the number of OFDM symbols or slots corresponding to the indices. The response information includes full negotiation or up or down timing based on the number of OFDM symbols or slot boundaries. The adjustment amount is the duration of an OFDM symbol, and may be a duration corresponding to one or more OFDM symbols.

Upon receiving the negotiation request, the parent node determines whether to perform adjustment according to the unit of time requested by the IAB node. If the unit of time for negotiation requested by the IAB node is an OFDM symbol index, the response information of the parent node includes whether the OFDM symbol indices are negotiated.

Upon receiving a response to the negotiation request sent by the parent node, the IAB node determines whether send negotiation can be performed between the child node and the parent node according to a certain unit of time (such as number of OFDM symbols, number of slots, or multiple OFDM symbols). If the IAB node receives a positive response, the child node and the parent node simultaneously send data to these time domain units.

In addition, the negotiation requested by the IAB node may be periodic, or the parent node semi-statically performs negotiation adjustment in a time domain unit.

Ninth Embodiment

In the present disclosure and the above-described embodiments, all timing control processes are performed on data transmission by the IAB node using the same downlink absolute timing event as a standard. However, in a practical application, downstream data may not be sent on the same absolute timing event. In this situation, matching the event when the IAB node simultaneously sends upstream data to the parent node and the event when the IAB node sends upstream data to the child node of the IAB node can be achieved by the mode provided in the embodiment. In an embodiment, the IAB network structure depicted in FIG. 2 is still used for illustration below.

In FIG. 2 shows a parent node, an IAB node, and a child node. The parent node is the parent node of the IAB node. The IAB node transmits transport link data to the parent node over the radio link, the child node is a slave link of the IAB node, and the IAB node transmits transport data or access link data to the child node over the radio link. The choice of transmission of the access line or transport line depends on the type of child node. It is assumed that the IAB node simultaneously receives data sent by the parent node and data sent by the child node.

As shown in FIG. 17, the donor node and the IAB node network in each layer keep their respective timings, that is, it is not necessary for all IAB nodes or donor nodes in the IAB network to support the same downlink send event. For example, there is a variance between the downlink timing of the parent node and the downlink timing of the IAB node. In FIG. 17, DL Tx represents downlink transmission, UL Rx represents uplink reception, DL Rx represents downlink reception, and UL Tx represents uplink transmission.

From the point of view of the IAB node, in order to perform SDM or FDM of the transport link and the access link, it is necessary that the IAB node's send timing to the parent node is consistent with the send timing of the IAB node to the child node.

For a child, in order to match the child's send timing with the downlink receive timing of the IAB node, the child's UL TX timing may lag the child's DL RX timing, which is a timing delay.

The mode in which the IAB node indicates to the child node to delay timing is a TA2 command, that is, the IAB node indicates to the child node a TA2 command with a value of 2 * T2 - 2 * T1, and then the child node adjusts the uplink sending in such a way that to obtain the T2 signal propagation delays for the downlink transmissions of the IAB node and the parent node so that synchronization is achieved.

In the situation where the child node is an IAB node, the DL RX timing may be further shifted forward by f1-AP or RRC signaling information.

Tenth Embodiment

In an embodiment, a device is provided for timing transmission. The transmission timing device can be applied to various base stations, and in particular to stations with integrated access and transport channels (IABs). The device is a control device mainly applied to the IAB node. As shown in FIG. 18, the device includes a first timing control unit 801.

The first timing control module 801 is configured to send timing control information to control data transmission to the third node and/or the first node.

The timing control information is used to control the timing of the uplink receive event of the second node from the third node and the downstream receive event of the second node from the first node, or to control the timing of the downlink transmission event of the second node and the uplink data transmission event of the second node. . For steps and specific processes implemented by various device modules, reference may be made to the multiplexing process of timing negotiation for data intervals by the nodes shown in each embodiment described above, which will not be re-described herein.

For example, in the above-described embodiments, in a situation where the transmission interval timing is controlled according to the interval boundaries, when the first timing control unit 801 controls the timing of the uplink reception event of the second node from the third node and the downlink data reception event of the second node from the first node in particular, one of the modes described below is provided.

The reception interval of the IAB node receiving the access data sent by the child node is timed with the reception interval of the IAB node receiving the bearer data sent by the parent node per unit of time by the timing adjustment command mode TA2.

The reception interval of the IAB node receiving the access data sent by the child node and the reception interval of the IAB node receiving the transport link data sent by the parent node are configured by the interface mode between the centralized unit and the distributed unit or the RRC signaling information sending mode, and the reception interval of the IAB node , receiving the access data sent by the child node, is timed with the receive interval of the IAB node receiving the transport line data sent by the parent node per unit of time.

The reception interval of the IAB node receiving the access data sent by the child node is matched with the reception interval of the IAB node receiving the bearer data sent by the parent node per unit of time through the Operation, Management, and Maintenance Background Configuration Mode (OAM).

As another example, based on the matching achieved according to the symbols, the timing control for the uplink data reception event by the second node from the third node and the downlink data reception timing by the second node from the first node includes one of the modes described below.

The timing of receiving access data sent by the child node by the IAB node is adjusted to be shifted forward or backward by the duration of N OFDM symbols relative to the timing of sending the transport link data by the parent node, by the timing adjustment command mode TA2; and N is greater than or equal to 1.

Timing of receipt by the IAB node of the access data sent by the child node is adjusted by the interface mode between the centralized unit and the distributed unit or RRC signaling information sending mode, and timing of the receipt by the IAB node of the access data sent by the child node is adjusted to be biased forward or backward by a duration of N OFDM symbols relative to the parent node's transport link data sending timing.

The IAB node's timing of receipt of access data sent by the child node is adjusted to be shifted forward or backward by a duration of N OFDM symbols relative to the timing of sending backlink data by the parent node through the Operation, Management, and Maintenance Background Configuration Mode (OAM) .

In an embodiment, the bearer data received by the IAB node is specifically sent by the parent node of the IAB node. Therefore, the present invention further provides a structure of another device for timing transmission. This device is built on top of the parent node. As shown in FIG. 19, the device includes a send module 191.

Sending module 191 is configured to send transport link data to an integrated access and transport (IAB) node over a radio link. The transport link data is used to determine the timing control information of the child node corresponding to the IAB node. The timing control information is used to control the timing negotiation for the IAB node and the data transmission event between the IAB node and the child node, and the bearer link data includes the absolute downlink transmission timing event for each node and the first transmission delay for the IAB node receiving the bearer data. lines. For the steps and specific processes implemented by the device modules, reference may be made to the multiplexing process of timing negotiation for data intervals by the nodes shown in each embodiment described above, which will not be re-described herein.

In an embodiment, two negotiation situations are basically achieved in the IAB node transmission timing process. One situation is to achieve simultaneous reception, that is, data from the parent node and uplink access line data sent by the child node with respect to the IAB node are received simultaneously; another situation is to achieve simultaneous sending, that is, upstream data is sent to the parent node and downstream data is sent to the child node of the IAB node at the same time.

Regardless of whether simultaneous receive or simultaneous send is achieved, in most situations the control point is a child node of the IAB node. For example, in order to achieve simultaneous reception, the timing of sending upstream data by a child node with respect to an IAB node must be controlled to allow the IAB node to receive uplink access line data sent by the child node with respect to the IAB node while simultaneously receiving downstream data from the parent node. . In an embodiment, another transmission timing device is further provided for use in a child node. As shown in FIG. 20, the apparatus includes a receiving unit 201 and a second timing adjustment unit 202.

The receiving unit 201 is configured to receive timing control information sent by the second node and timing the downlink transmission of each node.

The second timing adjustment module 202 is configured to match the timing of the uplink data reception event sent by the third node to the second node with the downstream reception event of the second node from the first node according to the timing control information. For steps and specific processes implemented by various device modules, reference may be made to the multiplexing process of timing negotiation for data intervals by the nodes shown in each embodiment described above, which will not be re-described herein.

According to the transmission timing device provided in the embodiment, the second node sends timing control information to the first node and/or the third node to control the matching of the second node's reception event of the data sent by the first node and the second node's reception event of the data sent by the third node. , or to control the negotiation of a send data event by the second node to the first node and a data send event by the second node to the third node, so that the IAB node can simultaneously receive data from the parent node and data from the child node, or can simultaneously send data to the parent node and send data to child node. Thus multiplexing of the node handover event is achieved, the data transmission efficiency of the IAB network is improved, the utilization of allocated resources is also improved, the UE requirements are better met, and the user experience is improved. The solution has a simple implementation and is applicable in many scenarios. The solution will be promoted internationally as a potential 5G standard and has significant market value.

Eleventh Embodiment

In an embodiment, a base station is provided as shown in FIG. 21. The system includes a processor 211, a memory 212, a communication unit 213, and a communication bus 214.

The communication bus 214 is configured to implement a communication connection between the processor 211, the communication unit 213, and the storage device 212.

In one embodiment, the processor 211 is configured to execute one or more first programs stored in the storage device to implement the steps of the transmission timing method according to the above-described embodiments.

In another embodiment, the processor 211 is configured to execute one or more second programs stored in the storage device to implement the steps of the transmission timing method according to the above-described embodiments.

In an embodiment, a computer-readable storage medium is also provided. Computer-readable storage media includes volatile and non-volatile, and removable or non-removable media implemented in any method or technology for storage of information (such as computer-readable instructions, data structures, computer program modules, or other data). The computer-readable storage medium includes, but is not limited to, random access memory (RAM); Read Only Memory (ROM); electronically erasable programmable read only memory (EEPROM); flash memory or other storage technologies, compact disc read only memory (CD-ROM), digital versatile disk (DVD) or other storage media in the form of an optical disc, magnetic cassette, magnetic tape, disk drive or other magnetic devices data storage, or any other medium used to store the desired information and available to the computer.

In one example, a computer-readable storage medium in an embodiment may be configured to store one or more first computer programs, where the one or more first computer programs may be executed by one or more processors to implement the steps of the transmission timing method according to the above-described embodiments.

In another example, the computer-readable storage medium in an embodiment may be configured to store one or more second computer programs, where the one or more second computer programs may be executed by one or more processors to implement the steps of the transmission timing method according to the above-described embodiments.

The embodiment also provides a first computer program (or computer software) that can be distributed on a computer-readable medium and that can be executed by a computing device to implement at least one step of the transmission timing method depicted in the above-described embodiments. In some situations, at least one depicted or described step may be performed in sequences other than those described in the embodiments described above.

The embodiment also provides a second computer program (or computer software) that can be distributed on a computer-readable medium and that can be executed by a computing device to implement at least one step of the transmission timing method depicted in the above-described embodiments. In some situations, at least one depicted or described step may be performed in sequences other than those described in the embodiments described above.

In an embodiment, a computer program product is further provided. The computer program product includes a computer-readable device that stores the first computer program or the second computer program depicted above. The computer-readable device in an embodiment may include the computer-readable storage medium depicted above.

The functional modules/blocks in all or part of the steps of the method, system, and apparatus described above may be implemented in software (which may be implemented in computer program codes executable by a computing device), firmware, hardware, and the like. combinations. In a hardware implementation, the separation of functional modules/blocks mentioned in the description above may not correspond to the separation of physical components. For example, one physical component may have multiple functions, or one function or step may be implemented jointly by multiple physical components. Some or all of the physical components may be implemented in software, executed by a processor such as a CPU, digital signal processor or microcontroller, may be implemented in hardware, or may be implemented in integrated circuits such as ASICs.

Communication media typically includes computer readable instructions, data structures, computer program modules, or other data in a modulated data signal, such as carriers or other transmission mechanisms, and may include any media for information delivery. Therefore, the present invention is not limited to any particular combination of hardware and software.

Claims (58)

1. A transmission timing method, including: sending, by the second node, timing control information to control data transmission to the third node and/or the first node; wherein the timing control information is used to control the timing of the reception of the uplink data received by the second node and transmitted from the third node, and the timing of the reception of the downstream data received by the second node and transmitted from the first node, while controlling the timing of the reception of the uplink data received by the second node and transmitted from the third node, and the timing of downlink data received by the second node and transmitted from the first node includes one of the following modes: matching the timing, through the timing adjustment command mode, a reception interval of the second node receiving access link data sent by the third node with a reception interval of the second node receiving the transport link data sent by the first node per unit of time; setting, by the interface mode between the centralized unit and the distributed unit, or the sending mode of radio resource control (RRC) signaling information, the reception interval of the second node receiving the access link data sent by the third node, and the reception interval of the second node receiving the transport link data sent by the first node , and matching the timing of the receiving interval of the second node receiving the access link data sent by the third node with the receiving interval of the second node receiving the transport link data sent by the first node per unit time; or coordinating timing, by means of the Operation, Management and Maintenance (OAM) background configuration mode, a reception interval of the second node receiving access link data sent by the third node with a reception interval of the second node receiving the transport link data sent by the first node per unit time; or the timing control information is used to control the negotiation of the downlink data transmission timing by the second node and the uplink data transmission timing by the second node. 2. The method according to claim 1, characterized in that the second node is a node with integrated access and transport channels (IAB), the first node is a parent node in relation to the second node, and the third node is a child node in relation to the second node. 3. The method according to claim 2, wherein the timing control information contains a time offset, and the time offset is obtained by: determining a first transmission delay between the first node and the second node and a second transmission delay between the second node and the third node; and calculating a timing offset according to the first transmission delay and the second transmission delay. 4. The method of claim 3, wherein the time offset is the difference between twice the second transmission delay and the first transmission delay. 5. The method of claim 1, wherein the time unit is a combined time unit including at least one orthogonal frequency division multiplexing (OFDM) symbol or at least one slot. 6. The method of claim 3, wherein the time offset is the number of OFDM symbols. 7. The method according to claim 6, characterized in that, in response to using the timing control information to control the timing of the reception of the uplink data received by the second node and transmitted from the third node, and the timing of the reception of the downstream data received by the second node and transmitted from the first node, after calculating the timing offset according to the first transmission delay and the second transmission delay, further includes: a second node receiving timing advance of at least one OFDM symbol; and calculating the timing offset according to the first transmission delay and the second transmission delay includes: determining, according to the first transmission delay and/or the second transmission delay and the OFDM symbol duration, the number of OFDM symbols that actually need to be adjusted. 8. The method according to claim 7, characterized in that the control of the timing of reception of uplink data received by the second node and transmitted from the third node, and the timing of reception of downstream data received by the second node and transmitted from the first node, includes one of the following modes : adjusting, by the timing adjustment command mode, the timing of receiving access link data sent from the third node and received by the second node such that it is shifted forward or backward by a duration of N OFDM symbols relative to the timing event of the transport link data sent by the first node to the second node, wherein N is greater than or equal to 1, and the backward shift N OFDM symbols refers to a fixed unit of time minus a duration corresponding to the number of OFDM symbols to be forward shifted; setting, by means of the interface mode between the centralized unit and the distributed unit or the RRC signaling information sending mode, timing of receiving access link data sent from the third node and received by the second node, and adjusting the timing of receiving access link data sent from the third node and received by the second by a node such that it is shifted forward or backward by a duration of N OFDM symbols relative to a transport link data timing event from the first node to the second node, where N is greater than or equal to 1; or adjusting, by means of the OAM background configuration mode, the timing of receiving access link data sent from the third node and received by the second node, such that it is shifted forward or backward by a duration of N OFDM symbols relative to the timing event of the transport link data sent by the first node in the second node, where N is greater than or equal to 1. 9. The method according to claim. 1, characterized in that before sending the second node to the third node of the timing control information for managing data transmission further includes: detecting whether the access to the connection between the second node and the third node is the initial access connection; wherein in response to the fact that the communication access between the second node and the third node is the initial access communication, the second node sends to the third node, through the system information broadcast mode, the timing control information and the signal format for the initial access. 10. The method of claim 9, wherein the timing control information comprises: a fixed value time offset or a data format selection strategy for adjusting the third node to transmit an uplink access signal; and controlling the timing of receiving uplink data received by the second node and transmitted from the third node and timing of receiving downstream data received by the second node and transmitted from the first node, includes: adjusting, according to the time offset or the data format selection strategy, the data sent by the third node node, into the receive window, where the second node receives data from the first node. 11. The method according to claim 10, characterized in that the strategy for selecting the data format for adjusting the third node includes: increasing the duration of the cyclic data prefix of the second node; or adding a guard interval before the cyclic data prefix of the second node. 12. The method of claim. 1, characterized in that, in response to controlling the negotiation of downlink data transmission timing by the second node and uplink data transmission timing by the second node, further comprises: sending by the second node to the first node a request to match the timing of the uplink data transmission with the downlink data transmission; receiving a response message sent by the first node according to the request, and determining the number of OFDM symbols to be shifted forward at an uplink timing event according to the first transmission delay and a downlink timing event by the second node; and adjusting the uplink timing event according to the number of OFDM symbols to be shifted forward. 13. The method of choosing the transmission time, including: receiving, by the third node, timing control information sent by the second node; and matching, according to the timing control information, the timing of the uplink transmission sent by the third node to the second node with the timing of the downlink transmission received by the second node from the first node; wherein, in response to the timing control information being a unit of time, matching, according to the timing control information, the timing of the uplink transmission sent by the third node to the second node with the timing of the downlink transmission received by the second node from the first node, includes one of the following modes: matching the timing, by the timing adjustment command mode and according to the unit of time, the reception interval of the second node receiving the access link data sent by the third node with the reception interval of the second node receiving the transport line data sent by the first node; setting, by the interface mode between the centralized unit and the distributed unit, or the sending mode of radio resource control (RRC) signaling information, the reception interval of the second node receiving the access link data sent by the third node, and the reception interval of the second node receiving the transport link data sent by the first node , and timing, according to the unit of time, the reception interval of the second node receiving the access line data sent by the third node with the reception interval of the second node receiving the transport line data sent by the first node; or timing, by means of Operation, Management and Maintenance (OAM) background configuration mode and according to the unit of time, the reception interval of the second node receiving the access link data sent by the third node with the reception interval of the second node receiving the transport link data sent by the first node . 14. The method of claim 13, wherein the third node is a child node of the second node and the second node is an integrated access and transport (IAB) node. 15. The method of claim 14, wherein, in response to the timing control information being the number of orthogonal frequency division multiplexing (OFDM) symbols, negotiating, according to the timing control information, uplink transmission timing, sent by the third node to the second node, with the timing of the downlink transmission received by the second node from the first node, includes one of the following modes: adjusting, by the timing adjustment command mode, the timing of receiving access link data sent from the third node and received by the second node such that it is shifted forward or backward by a duration of N OFDM symbols relative to the timing event of the transport link data sent by the first node to the second node, wherein N is greater than or equal to 1, and the backward shift N OFDM symbols refers to a fixed unit of time minus a duration corresponding to the number of OFDM symbols to be forward shifted; setting, by means of the interface mode between the centralized unit and the distributed unit or the RRC signaling information sending mode, timing of receiving access link data sent from the third node and received by the second node, and adjusting the timing of receiving access link data sent from the third node and received by the second by a node such that it is shifted forward or backward by a duration of N OFDM symbols relative to a transport link data timing event from the first node to the second node, where N is greater than or equal to 1; or adjusting, by means of the OAM background configuration mode, the timing of receiving access link data sent from the third node and received by the second node, such that it is shifted forward or backward by a duration of N OFDM symbols relative to the timing event of the transport link data sent by the first node in the second node, where N is greater than or equal to 1. 16. A device for selecting the transmission time, comprising: a first timing control module, configured to send timing control information to control data transmission to the third node and/or the first node; wherein the timing control information is used to control the timing of the reception of the uplink data received by the second node and transmitted from the third node, and the timing of the reception of the downstream data received by the second node and transmitted from the first node, while controlling the timing of the reception of the uplink data received by the second node and transmitted from the third node, and the timing of downlink data received by the second node and transmitted from the first node includes one of the following modes: matching the timing, through the timing adjustment command mode, a reception interval of the second node receiving access link data sent by the third node with a reception interval of the second node receiving the transport link data sent by the first node per unit of time; setting, by the interface mode between the centralized unit and the distributed unit, or the sending mode of radio resource control (RRC) signaling information, the reception interval of the second node receiving the access link data sent by the third node, and the reception interval of the second node receiving the transport link data sent by the first node , and matching the timing of the receiving interval of the second node receiving the access link data sent by the third node with the receiving interval of the second node receiving the transport link data sent by the first node per unit time; or coordinating timing, by means of the Operation, Management and Maintenance (OAM) background configuration mode, a reception interval of the second node receiving access link data sent by the third node with a reception interval of the second node receiving the transport link data sent by the first node per unit time; or the timing control information is used to control the negotiation of the downlink data transmission timing by the second node and the uplink data transmission timing by the second node. 17. Base station containing a processor, a storage device, a communication unit and a communication bus; wherein the communication bus is configured to implement a radio connection between the processor, the communication unit and the storage device; the processor is configured to execute one or more first programs stored in the storage device to implement the method according to any one of paragraphs. 1–12; and the processor is configured to execute one or more second programs stored in the storage device to implement the method according to any one of paragraphs. 13–15. 18. A computer-readable storage medium configured to store one or more first computer programs and one or more second computer programs, wherein the one or more first computer programs can be executed by one or more processors to implement the method of any one of claims. 1–12; and one or more second computer programs may be executed by one or more processors to implement the method of any one of claims. 13–15.

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