CN112888066B - PDCCH sending method, PDCCH receiving device and node equipment - Google Patents

Abstract

The invention provides a method and a device for sending and receiving a Physical Downlink Control Channel (PDCCH) and node equipment. The transmitting method comprises the following steps: when the synchronous signal SS or physical broadcast channel Block PBCH Block measurement time configuration SMTC window of the MT side conflicts with the first PDCCH monitoring time of the DU side, the transmission of the PDCCH of the DU side is abandoned; at a second PDCCH monitoring time, sending downlink control information DCI to the terminal; the DCI is used for indicating the terminal not to monitor the PDCCH. By adopting the method, when the SMTC window of the MT side collides with the PDCCH monitoring time of the DU side, the transmission of the PDCCH of the DU side is abandoned, and the terminal is instructed not to monitor the PDCCH at the second PDCCH monitoring time through DCI, so that the unnecessary PDCCH blind detection by the terminal is avoided, and the energy waste is caused.

Description

PDCCH sending method, receiving method, device and node equipment

technical field

The present invention relates to the field of wireless technology, in particular to a sending method, receiving method, device and node equipment of a physical downlink control channel PDCCH.

Background technique

In 5G hotspot high-capacity scenarios, such as shopping malls, plazas, airports and other places, the downlink data transmission rate can reach 300Mbps, the uplink data transmission rate can reach 50Mbps, the downlink capacity can reach 750Gbps/km2, and the uplink capacity can reach 125Gbps/km2; in order to support such a high transmission rate and capacity, large bandwidth and dense deployment are required, and high-frequency millimeter waves can meet this demand. Due to the limited coverage of high-frequency millimeter waves, intensive deployment is required. In order to reduce the dependence and cost on optical fibers, Integrated Access and Backhaul (IAB) technology needs to be used to increase the backhaul function on the basis of satisfying the access function of the base station.

Wireless communication systems using IAB technology include:

Donor base station/node (IAB donor/node): that is, the anchor point connected to the core network with optical fiber, such as shown in Figure 1, the donor base station/node (IAB donor/node) can be the fifth-generation evolved base station NodeB (DgNB);

IAB node (IAB node): There is no optical fiber connection and core network, but it can be backhauled through wireless links and can provide access functions, such as IAB1 and IAB2 in Figure 1. Wherein, the IAB node includes a mobile terminal (Mobile Termination, MT) side and a distributed unit (Distributed Unit, DU) side, the MT side realizes the backhaul function of the IAB node (also called the MT function), and the DU side realizes the access function of the IAB node (also called the DU function).

In addition, each IAB node needs to perform inter-node discovery and measurement. Currently, inter-node discovery and measurement based on Synchronization Signal Block (SSB) is defined. The window used for measurement on the MT side is called the SSB Measurement Time Configuration (SMTC) window, and the window used by the DU side to send SSB is called the SSB Time Configuration (SSB Time Configuration, STC) window. Each SMTC and STC window needs to define parameters such as period, offset offset, and duration. The DU side of each IAB node needs to configure the physical downlink control channel (Physical Downlink Control Channel, PDCCH) monitoring opportunity for its access terminal UE, including period, offset, duration and so on.

In an IAB scenario, if an SMTC window is configured on the MT side of an IAB node, considering half-duplex restrictions, if the MT side receives SSB, the DU side cannot send and receive; if the MT side does not receive SSB, the DU side can send and receive, depending on the resource type on the DU side.

Based on the above, when an IAB node is configured with an SMTC window, if there is a PDCCH monitoring opportunity configuration on the DU side, whether the terminal needs to perform PDCCH blind detection needs to be further studied to avoid unnecessary PDCCH blind detection and waste terminal energy.

Contents of the invention

The purpose of the technical solution of the present invention is to provide a physical downlink control channel PDCCH sending method, receiving method, device and node equipment, which are used to solve the problem that when the SMTC window on the MT side of the IAB node and the PDCCH monitoring opportunity on the DU side conflict, the terminal performs unnecessary PDCCH blind detection, resulting in energy waste.

The present invention provides a method for sending a physical downlink control channel PDCCH, which is applied to an integrated IAB node for access and backhaul, wherein the method includes:

When the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side, the transmission of the PDCCH on the DU side is abandoned;

At the second PDCCH monitoring opportunity, the downlink control information DCI is sent to the terminal; wherein the DCI is used to instruct the terminal not to perform PDCCH monitoring.

Optionally, in the sending method, the first PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

Optionally, in the sending method, the second PDCCH monitoring occasion is a PDCCH monitoring occasion closest to the first PDCCH monitoring occasion.

Optionally, in the sending method, the second PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource.

Optionally, in the sending method, the downlink control information DCI instructs the terminal not to monitor the PDCCH through a preset indication field.

Optionally, in the sending method, wherein the preset indication field includes N bits, which are used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; where N is an integer greater than or equal to 1.

Optionally, the sending method, wherein the method further includes:

At the timing of PDCCH monitoring when the DCI indicates no monitoring, if the time domain resources of the terminal are configured as flexible resources, send an SFI indicating uplink resources or flexible resources to the terminal.

Another aspect of the present invention also provides a method for receiving a physical downlink control channel PDCCH, which is applied to a terminal, wherein the method includes:

When accessing the synchronization signal SS on the MT side of the integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCH Block conflicts with the first PDCCH monitoring opportunity on the DU side, receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity;

Wherein, the DCI is used to instruct the terminal not to monitor the PDCCH.

Optionally, in the sending method, the first PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

Optionally, in the sending method, the second PDCCH monitoring occasion is a PDCCH monitoring occasion closest to the first PDCCH monitoring occasion.

Optionally, in the sending method, the second PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends the PDCCH on the DU side;

The time domain resources of the terminal are configured as flexible resources, the IAB node sends the PDCCH on the DU side, and the time slot format sent to the terminal indicates that the SFI is a downlink resource.

Optionally, in the sending method, the downlink control information DCI instructs the terminal not to monitor the PDCCH through a preset indication field.

Optionally, in the sending method, wherein the preset indication field includes N bits, which are used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; where N is an integer greater than or equal to 1.

Optionally, the sending method, wherein the method further includes:

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as downlink resources, PDCCH monitoring is still performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as uplink resources, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the time slot format indication SFI indicated as an uplink resource or a flexible resource is received, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the terminal receives an SFI indicated as an uplink resource or does not receive an SFI, PDCCH monitoring is still performed.

One aspect of the present invention also provides an integrated IAB node device for access and backhaul, including a transceiver, wherein the transceiver is used for:

When the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side, the transmission of the PDCCH on the DU side is abandoned;

At the second PDCCH monitoring opportunity, the downlink control information DCI is sent to the terminal; wherein the DCI is used to instruct the terminal not to perform PDCCH monitoring.

One aspect of the present invention also provides a terminal, including a transceiver, wherein the transceiver is used for:

When accessing the synchronization signal SS on the MT side of the integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCH Block conflicts with the first PDCCH monitoring opportunity on the DU side, receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity;

Wherein, the DCI is used to instruct the terminal not to monitor the PDCCH.

One aspect of the present invention also provides a physical downlink control channel PDCCH sending device, which is applied to an integrated IAB node for access and backhaul, wherein the device includes:

The processing module is used to abandon the transmission of the PDCCH on the DU side when the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side;

The sending module is configured to send downlink control information DCI to the terminal at a second PDCCH monitoring opportunity; wherein, the DCI is used to instruct the terminal not to perform PDCCH monitoring.

One aspect of the present invention also provides a receiving device for a physical downlink control channel PDCCH, which is applied to a terminal, wherein the device includes:

The receiving module is used to receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity when the synchronization signal SS on the MT side of the integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCH Block conflicts with the first PDCCH monitoring opportunity on the DU side;

Wherein, the DCI is used to instruct the terminal not to monitor the PDCCH.

One aspect of the present invention also provides a network device, which includes: a processor, a memory, and a program stored on the memory and operable on the processor. When the program is executed by the processor, the method for sending the PDCCH as described in any one of the above is implemented, or the method for receiving the PDCCH as described in any one of the above is implemented.

One aspect of the present invention also provides a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps in the method for sending a PDCCH as described in any one of the above are implemented, or the steps in the method for receiving a PDCCH as described in any one of the above are implemented.

At least one of the above technical solutions of the present invention has the following beneficial effects:

Using the PDCCH transmission method described in the embodiment of the present invention, when the SMTC window of the SS or PBCH Block on the MT side conflicts with the PDCCH monitoring opportunity on the DU side, the transmission of the PDCCH on the DU side is abandoned, and at the second PDCCH monitoring opportunity, the terminal is instructed not to perform PDCCH monitoring through downlink control information (DCI), so as to avoid unnecessary PDCCH blind detection by the terminal, resulting in energy waste.

Description of drawings

FIG. 1 is a schematic diagram of the architecture of a wireless communication system adopting the method described in the embodiment of the present invention;

FIG. 2 is a schematic flowchart of a method for sending a PDCCH according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of the time slot structure when the SMTC window on the MT side collides with the STC window on the DU side;

FIG. 4 is a schematic flowchart of a method for receiving and sending a PDCCH according to an embodiment of the present invention;

5 is a schematic structural diagram of an IAB node device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a device for sending a PDCCH according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a device for receiving a PDCCH according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of the network device described in one implementation manner of the embodiments of the present invention;

FIG. 10 is a schematic structural diagram of a network device according to another implementation manner of an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

The method for sending and receiving the physical downlink control channel PDCCH described in the embodiment of the present invention is applied to a wireless communication system using the IAB technology. FIG. 1 is a schematic structural diagram of a wireless communication system adopting the method described in the embodiment of the present invention. Wherein the wireless communication system includes:

Donor base station/node (IAB donor/node): that is, an anchor point connected to the core network with optical fiber, such as shown in Figure 1. In the embodiment of the present invention, the donor base station/node (IAB donor/node) is DgNB.

IAB node (IAB node): There is no optical fiber connection and core network, but it can be backhauled through wireless links and can provide access functions, such as IAB1 and IAB2 in Figure 1.

Among them, the last hop node of a certain IAB node is the parent node, such as DgNB in Figure 1 is the parent node of IAB1; the next hop node of a certain IAB node is a child node, such as IAB 2 in Figure 1 is the child node of IAB 1; the link between the terminal UE and the IAB node or IAB donor is an access link, and the access link includes an uplink access link and a downlink access link, such as links 1a, 2a and 3 in Figure 1; The link is a backhaul link, and the backhaul link includes an uplink backhaul link and a downlink backhaul link, such as links 1b and 2b in FIG. 1 .

One of the methods for data transmission using the system shown in Figure 1 is Time Division Multiplexing (TDM): the MT side and the DU side of one of the IAB nodes do not send and receive at the same time, the MT side performs data transmission at one time, and the DU side performs transmission at another time; for example, 1b and 2b, 1b and 2a, 1b and (2a and 2b) in Figure 1.

In addition, in the IAB scenario, the resource configuration of the IAB node includes the following situations:

On the MT side, the time domain resources of the parent link include downlink DL resources, uplink UL resources and flexible Flexible resources;

On the DU side, the time domain resources of the sublink include downlink DL resources, uplink UL resources, flexible resources and Not Available resources. For DL resources, UL resources and Flexible resources, they are divided into hard resources and soft resources;

Among them, the Hard resource indicates that the sub-link is always available resource;

Soft resources indicate that whether the sublink is available is explicitly or implicitly controlled by the parent node.

In the IAB scenario, each IAB node needs to perform inter-node discovery and measurement. The standard defines inter-node discovery and measurement based on a synchronization signal (Synchronization Signal, SS) or a physical broadcast channel block (Physical Broadcast Channel Block, PBCH Block). The window used for SSB measurement on the MT side is called the SMTC window, and the window used by the DU side to send SS or PBCH Block is called the STC window. Each SMTC and STC window needs to define the period, offset, offset, Parameters such as duration duration. The DU side of each IAB node needs to configure the PDCCH monitoring opportunity for its access UE, and the configuration includes period, offset, duration and so on.

Usually, the following conditions are satisfied between slot resource configuration through a slot format indicator (SFI) and a PDCCH monitoring monitor:

1) SFI cannot conflict with the direction of the semi-static configuration;

2) If the semi-static configuration resource is a flexible resource, or if the semi-static configuration is missing, the UE detects the SFI, and for the PDCCH reception configured by the upper layer, PDCCH monitoring will only be performed when the SFI indicates that the resource is a DL resource; if the SFI indicates that the resource is UL resources or Flexible resources, the UE will not perform PDCCH monitoring;

3) If the UE does not receive the SFI and there is no DCI indicating uplink transmission, the UE will monitor the PDCCH.

In an IAB scenario, if the MT side of an IAB node is configured with an SMTC window, if the MT side receives SSB, the DU side cannot send and receive; if the MT side does not receive SSB, the DU side can send and receive, depending on the resource type of the DU side. Therefore, when an IAB node is configured with an SMTC window, if there is a PDCCH monitoring opportunity configuration on the DU side, in order to prevent the UE from performing unnecessary PDCCH blind detection, the embodiment of the present invention provides a PDCCH sending method.

Specifically, as shown in FIG. 2, one implementation of the PDCCH sending method according to the embodiment of the present invention includes:

S210, when the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side, abandoning the sending of the PDCCH on the DU side;

S220. At a second PDCCH monitoring opportunity, send downlink control information DCI to the terminal; wherein the DCI is used to instruct the terminal not to monitor the PDCCH.

Using the PDCCH transmission method described in the embodiment of the present invention, when the SMTC window of the SS or PBCH Block on the MT side conflicts with the PDCCH monitoring opportunity on the DU side, the transmission of the PDCCH on the DU side is abandoned, and at the second PDCCH monitoring opportunity, the terminal is instructed not to perform PDCCH monitoring through downlink control information (DCI), so as to avoid unnecessary PDCCH blind detection by the terminal, resulting in energy waste.

Compared with the prior art, the method for sending the PDCCH in the present invention introduces a DCI format for instructing the terminal not to monitor the PDCCH. Optionally, a preset indication field in the DCI may be used to instruct the terminal not to monitor the PDCCH.

Further, optionally, the preset indication field in the DCI for instructing the terminal not to perform PDCCH monitoring includes N bits, and is used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities, where N is an integer greater than or equal to 1.

By adopting the DCI with the above-mentioned structure, N bits can be used to indicate that PDCCH monitoring is not performed at subsequent N PDCCH monitoring opportunities, and it is formed in the form of multi-slot joint indication.

In the embodiment of the present invention, optionally, in step S220, the second PDCCH monitoring opportunity for sending the DCI is the closest PDCCH monitoring opportunity to the first PDCCH monitoring opportunity, so as to ensure that the DCI indicating that the terminal does not perform PDCCH monitoring can be sent to the terminal in a timely and effective manner.

Optionally, the second PDCCH monitoring opportunity meets one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource.

The second PDCCH monitoring opportunity meeting any of the above conditions ensures that the DCI used to instruct the terminal not to monitor the PDCCH can be received by the terminal in a timely and effective manner.

Further, the first PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

It should be noted that, in one embodiment, according to the usual processing rules, if the time domain resource of the terminal is configured as a downlink DL resource at the first PDCCH monitoring opportunity, the UE needs to detect the PDCCH regardless of whether the DU side sends a PDCCH, thereby causing energy waste; using the method described in the embodiment of the present invention, when the SMTC window on the MT side conflicts with the first PDCCH monitoring opportunity on the DU side, and the time domain resource of the terminal is configured as a DL resource, the DU side does not send the PDCCH, and at the second PDCCH monitoring opportunity, Sending DCI indicating not to perform PDCCH monitoring to the terminal, so as to instruct the terminal not to perform PDCCH detection, so as to avoid energy waste caused by blind detection of PDCCH;

In another embodiment, according to the usual processing rules, if at the first PDCCH monitoring opportunity, the time domain resources of the terminal are configured as Flexible resources, UL resources or flexible flexible resources can be indicated through SFI, but if the terminal does not receive SFI normally, the UE still needs to detect PDCCH, resulting in waste; using the method described in the embodiment of the present invention, when the SMTC window on the MT side conflicts with the first PDCCH monitoring opportunity on the DU side, and the time domain resources of the terminal are configured as flexible resources, the DU side does not The PDCCH is sent, and at the second PDCCH monitoring opportunity, DCI indicating not to perform PDCCH monitoring is sent to the terminal to instruct the terminal not to perform PDCCH detection, thereby avoiding energy waste caused by PDCCH blind detection.

In the embodiment of the present invention, after step S220, the method further includes:

At the timing of PDCCH monitoring when the DCI indicates no monitoring, if the time domain resources of the terminal are configured as flexible resources, send an SFI indicating uplink resources or flexible resources to the terminal.

FIG. 3 shows a schematic diagram of a time slot structure when the SMTC window on the MT side collides with the STC window on the DU side (that is, the first PDCCH monitoring opportunity). According to Fig. 3, when the SMTC window on the MT side conflicts with the first PDCCH monitoring opportunity, no matter the configured resources on the DU side are Not Available resources, soft soft resources or hard hard resources, the PDCCH is not sent on the DU side.

When the DU side does not send PDCCH, if the UE's time domain is configured as DL resources, the terminal still needs to detect PDCCH; if the UE's time domain resources are configured as UL resources, the terminal does not need to detect PDCCH; if the UE's time domain resources are configured as flexible resources, if the SFI indicates uplink UL resources or flexible resources, it does not need to detect PDCCH; if the SFI indicates downlink resources or no SFI is received, the terminal still needs to detect PDCCH. Therefore, when the PDCCH is not sent on the DU side and the time domain resources of the terminal are configured as flexible resources, by sending the SFI indicating uplink resources or flexible resources to the terminal, the terminal can avoid further detection of the PDCCH and achieve the purpose of energy saving.

The embodiment of the present invention also provides a method for receiving a PDCCH, which is applied to a terminal, as shown in FIG. 4, and the method includes:

S410, when the synchronization signal SS on the MT side of the access backhaul integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCHBlock conflicts with the first PDCCH monitoring opportunity on the DU side, receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity;

Wherein, the DCI is used to instruct the terminal not to monitor the PDCCH.

Using the PDCCH receiving method described in the embodiment of the present invention, when the SMTC window of the SS or PBCH Block on the MT side conflicts with the PDCCH monitoring timing on the DU side, the IAB node gives up the sending of the PDCCH on the DU side, and at the second PDCCH monitoring timing, the downlink control information (Downlink Control Information, DCI) instructs the terminal not to perform PDCCH monitoring, so as to prevent the terminal from performing unnecessary PDCCH blind detection, resulting in energy waste.

In the PDCCH receiving method described in the embodiment of the present invention, optionally, the first PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

In one embodiment, according to the usual processing rules, if the time domain resources of the terminal are configured as downlink DL resources at the first PDCCH monitoring opportunity, the UE needs to detect the PDCCH regardless of whether the DU side sends a PDCCH, thereby causing energy waste; using the method described in the embodiment of the present invention, when the SMTC window on the MT side conflicts with the first PDCCH monitoring opportunity on the DU side, and when the time domain resources of the terminal are configured as DL resources, the DU side does not send PDCCH, and at the second PDCCH monitoring opportunity, send an instruction to the terminal not to proceed DCI of PDCCH monitoring to instruct the terminal not to perform PDCCH detection, so as to avoid energy waste caused by PDCCH blind detection;

In another embodiment, according to the usual processing rules, if at the first PDCCH monitoring opportunity, the time domain resources of the terminal are configured as Flexible resources, UL resources or Flexible resources can be indicated through the SFI, but if the terminal does not receive the SFI normally, the UE still needs to detect the PDCCH, thereby causing waste; using the method described in the embodiment of the present invention, when the SMTC window on the MT side conflicts with the first PDCCH monitoring opportunity on the DU side, and the time domain resources of the terminal are configured as Flexible resources, the DU side does not send PDCCH. DCCH, and at the second PDCCH monitoring opportunity, send DCI indicating not to perform PDCCH monitoring to the terminal, so as to instruct the terminal not to perform PDCCH detection, so as to avoid energy waste caused by PDCCH blind detection.

In the method for receiving a PDCCH according to the embodiment of the present invention, optionally, the second PDCCH monitoring opportunity is a PDCCH monitoring opportunity closest to the first PDCCH monitoring opportunity.

In the PDCCH receiving method described in the embodiment of the present invention, optionally, the second PDCCH monitoring opportunity meets one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends the PDCCH on the DU side;

The time domain resources of the terminal are configured as flexible resources, the IAB node sends the PDCCH on the DU side, and the time slot format sent to the terminal indicates that the SFI is a downlink resource.

The second PDCCH monitoring opportunity meeting any of the above conditions ensures that the DCI used to instruct the terminal not to monitor the PDCCH can be received by the terminal in a timely and effective manner.

In the method for receiving the PDCCH according to the embodiment of the present invention, optionally, the downlink control information DCI indicates that the terminal does not monitor the PDCCH through a preset indication field.

In the PDCCH receiving method described in the embodiment of the present invention, optionally, the preset indication field includes N bits, which are used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; where N is an integer greater than or equal to 1.

By adopting the DCI with the above-mentioned structure, N bits can be used to indicate that PDCCH monitoring is not performed at subsequent N PDCCH monitoring opportunities, and it is formed in the form of multi-slot joint indication.

In the method for receiving the PDCCH described in the embodiment of the present invention, optionally, the method further includes:

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as downlink resources, PDCCH monitoring is still performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as uplink resources, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the time slot format indication SFI indicated as an uplink resource or a flexible resource is received, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the terminal receives an SFI indicated as an uplink resource or does not receive an SFI, PDCCH monitoring is still performed.

The embodiment of the present invention also provides an integrated IAB node device for access and backhaul, as shown in FIG. 5 , including a transceiver 510, and the transceiver 510 is used for:

When the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side, the transmission of the PDCCH on the DU side is abandoned;

At the second PDCCH monitoring opportunity, the downlink control information DCI is sent to the terminal; wherein the DCI is used to instruct the terminal not to perform PDCCH monitoring.

Optionally, the IAB node device, wherein the first PDCCH monitoring opportunity meets one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

Optionally, in the IAB node device, the second PDCCH monitoring opportunity is a PDCCH monitoring opportunity closest to the first PDCCH monitoring opportunity.

Optionally, in the IAB node device, the second PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource. Optionally, the IAB node device, wherein the downlink control information DCI indicates that the terminal does not perform PDCCH monitoring through a preset indication field.

Optionally, in the IAB node device, wherein the preset indication field includes N bits, which are used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; where N is an integer greater than or equal to 1.

Optionally, the IAB node device, wherein the transceiver 510 is also used for:

At the timing of PDCCH monitoring when the DCI indicates no monitoring, if the time domain resources of the terminal are configured as flexible resources, send an SFI indicating uplink resources or flexible resources to the terminal.

One embodiment of the present invention also provides a terminal, as shown in FIG. 6, the terminal includes a transceiver 610 for:

When accessing the synchronization signal SS on the MT side of the integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCH Block conflicts with the first PDCCH monitoring opportunity on the DU side, receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity;

Wherein, the DCI is used to instruct the terminal not to monitor the PDCCH.

Optionally, in the terminal, wherein the first PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

Optionally, in the terminal, wherein, the second PDCCH monitoring occasion is a PDCCH monitoring occasion closest to the first PDCCH monitoring occasion.

Optionally, in the terminal, wherein the second PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends the PDCCH on the DU side;

The time domain resources of the terminal are configured as flexible resources, the IAB node sends the PDCCH on the DU side, and the time slot format sent to the terminal indicates that the SFI is a downlink resource.

Optionally, in the terminal, wherein the downlink control information DCI instructs the terminal not to monitor the PDCCH through a preset indication field.

Optionally, the terminal, wherein the preset indication field includes N bits, used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; where N is an integer greater than or equal to 1.

Optionally, the terminal further includes a processor 620 configured to:

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as downlink resources, PDCCH monitoring is still performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as uplink resources, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the time slot format indication SFI indicated as an uplink resource or a flexible resource is received, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the terminal receives an SFI indicated as an uplink resource or does not receive an SFI, PDCCH monitoring is still performed.

One embodiment of the present invention also provides a device for sending a physical downlink control channel PDCCH, which is applied to an integrated IAB node for access and backhaul. As shown in FIG. 7, the device includes:

The processing module 710 is used to abandon the transmission of the DU side PDCCH when the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side;

The sending module 720 is configured to send downlink control information DCI to the terminal at a second PDCCH monitoring opportunity; wherein, the DCI is used to instruct the terminal not to perform PDCCH monitoring.

Optionally, in the sending device, the first PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

Optionally, in the sending device, the second PDCCH monitoring occasion is a PDCCH monitoring occasion closest to the first PDCCH monitoring occasion.

Optionally, in the sending device, the second PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource. Optionally, in the sending device, wherein the downlink control information DCI instructs the terminal not to monitor the PDCCH through a preset indication field.

Optionally, in the sending device, the preset indication field includes N bits, which are used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; where N is an integer greater than or equal to 1.

Optionally, in the sending device, the sending module 720 is also used for:

At the timing of PDCCH monitoring when the DCI indicates no monitoring, if the time domain resources of the terminal are configured as flexible resources, send an SFI indicating uplink resources or flexible resources to the terminal.

One embodiment of the present invention also provides a device for receiving a physical downlink control channel PDCCH, which is applied to a terminal. As shown in FIG. 8, the device includes:

The receiving module 810 is used to receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity when the synchronization signal SS on the MT side of the integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCH Block conflicts with the first PDCCH monitoring opportunity on the DU side;

Wherein, the DCI is used to instruct the terminal not to monitor the PDCCH.

Optionally, in the receiving device, wherein the first PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

Optionally, in the receiving device, the second PDCCH monitoring occasion is a PDCCH monitoring occasion closest to the first PDCCH monitoring occasion.

Optionally, in the receiving device, the second PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends the PDCCH on the DU side;

The time domain resources of the terminal are configured as flexible resources, the IAB node sends the PDCCH on the DU side, and the time slot format sent to the terminal indicates that the SFI is a downlink resource.

Optionally, in the receiving apparatus, wherein the downlink control information DCI instructs the terminal not to monitor the PDCCH through a preset indication field.

Optionally, in the receiving device, wherein the preset indication field includes N bits, which are used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; where N is an integer greater than or equal to 1.

Optionally, the receiving device, wherein the device further includes a monitoring module 820, configured to:

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as downlink resources, PDCCH monitoring is still performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as uplink resources, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the time slot format indication SFI indicated as an uplink resource or a flexible resource is received, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the terminal receives an SFI indicated as an uplink resource or does not receive an SFI, PDCCH monitoring is still performed.

Another aspect of the embodiment of the present invention also provides a network device, the network device is an integrated IAB node for access and backhaul, as shown in FIG. 9 , including: a processor 901; and a memory 903 connected to the processor 901 through a bus interface 902, the memory 903 is used to store programs and data used by the processor 901 when performing operations, and the processor 901 invokes and executes the programs and data stored in the memory 903.

Wherein, the transceiver 904 is connected to the bus interface 902, and is used to receive and send data under the control of the processor 901. Specifically, the processor 901 is used to read the program in the memory 903, and perform the following processes:

When the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side, the transmission of the PDCCH on the DU side is abandoned;

At the second PDCCH monitoring opportunity, the downlink control information DCI is sent to the terminal; wherein the DCI is used to instruct the terminal not to perform PDCCH monitoring.

Optionally, the network device, wherein the first PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

Optionally, in the network device, the second PDCCH monitoring occasion is a PDCCH monitoring occasion closest to the first PDCCH monitoring occasion.

Optionally, the network device, wherein the second PDCCH monitoring opportunity meets one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource. Optionally, the network device, wherein, the downlink control information DCI instructs the terminal not to monitor the PDCCH through a preset indication field.

Optionally, the network device, wherein the preset indication field includes N bits, which are used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; where N is an integer greater than or equal to 1.

Optionally, in the network device, the processor 901 is further configured to:

At the timing of PDCCH monitoring when the DCI indicates no monitoring, if the time domain resources of the terminal are configured as flexible resources, send an SFI indicating uplink resources or flexible resources to the terminal.

Wherein, in FIG. 9 , the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 901 and various circuits of the memory represented by the memory 903 are linked together. The bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described herein. The bus interface provides the interface. Transceiver 904 may be a plurality of elements, including a transmitter and a transceiver, providing a means for communicating with various other devices over a transmission medium. The processor 901 is responsible for managing the bus architecture and general processing, and the memory 903 can store data used by the processor 901 when performing operations.

Another aspect of the embodiment of the present invention provides a network device, the network device is a terminal, as shown in FIG. 10 , including: a processor 1001; and a memory 1003 connected to the processor 1001 through a bus interface 1002, the memory 1003 is used to store programs and data used by the processor 1001 when performing operations, and the processor 1001 invokes and executes the programs and data stored in the memory 1003.

Wherein, the transceiver 1004 is connected to the bus interface 1002, and is used to receive and send data under the control of the processor 1001. Specifically, the processor 1001 is used to read the program in the memory 1003, and execute the following process:

When accessing the synchronization signal SS on the MT side of the integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCH Block conflicts with the first PDCCH monitoring opportunity on the DU side, receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity;

Wherein, the DCI is used to instruct the terminal not to monitor the PDCCH.

Optionally, the network device, wherein the first PDCCH monitoring opportunity satisfies one of the following conditions:

The time domain resources of the terminal are configured as downlink resources;

The time domain resources of the terminal are configured as flexible resources.

Optionally, in the network device, the second PDCCH monitoring occasion is a PDCCH monitoring occasion closest to the first PDCCH monitoring occasion.

Optionally, the network device, wherein the second PDCCH monitoring opportunity meets one of the following conditions:

The time domain resources of the terminal are configured as downlink resources, and the IAB node sends the PDCCH on the DU side;

The time domain resources of the terminal are configured as flexible resources, the IAB node sends the PDCCH on the DU side, and the time slot format sent to the terminal indicates that the SFI is a downlink resource.

Optionally, the network device, wherein, the downlink control information DCI instructs the terminal not to monitor the PDCCH through a preset indication field.

Optionally, the network device, wherein the preset indication field includes N bits, which are used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; where N is an integer greater than or equal to 1.

Optionally, the network device, wherein the method further includes:

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as downlink resources, PDCCH monitoring is still performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as uplink resources, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the time slot format indication SFI indicated as an uplink resource or a flexible resource is received, PDCCH monitoring is not performed;

At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the terminal receives an SFI indicated as an uplink resource or does not receive an SFI, PDCCH monitoring is still performed.

It should be noted that, in FIG. 10 , the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 1001 and various circuits of the memory represented by the memory 1003 are linked together. The bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described herein. The bus interface provides the interface. Transceiver 1004 may be a plurality of elements, including a transmitter and a receiver, providing a means for communicating with various other devices over transmission media. For different terminals, the user interface 1005 may also be an interface capable of connecting externally and internally to required devices, and the connected devices include but not limited to keypads, displays, speakers, microphones, joysticks, and the like. The processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1003 can store data used by the processor 1001 when performing operations.

Those skilled in the art will understand that all or part of the steps in the above embodiments may be implemented by hardware, or may be completed by instructing related hardware through a program, the program including instructions for executing part or all of the steps of the above method; and the program may be stored in a readable storage medium, and the storage medium may be any form of storage medium.

In addition, a specific embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored, wherein, when the program is executed by a processor, the steps in the method for sending the PDCCH described in any one of the above are implemented, or the steps in the method for receiving the PDCCH described in any one of the above are implemented.

In the several embodiments provided in this application, it should be understood that the disclosed methods and devices may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may be physically included separately, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, or in the form of hardware plus software functional units.

The above-mentioned integrated units implemented in the form of software functional units may be stored in a computer-readable storage medium. The above-mentioned software functional units are stored in a storage medium, including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute some steps of the sending and receiving method described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM for short), random access memory (Random Access Memory, RAM for short), magnetic disk or optical disk, and various media that can store program codes.

What has been described above is a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (17)

1. a method for sending a physical downlink control channel PDCCH, which is applied to an integrated IAB node for access backhaul, wherein the method comprises: When the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side, the transmission of the PDCCH on the DU side is abandoned; At the second PDCCH monitoring opportunity, send downlink control information DCI to the terminal; wherein, the DCI is used to instruct the terminal not to perform PDCCH monitoring; The second PDCCH monitoring opportunity meets one of the following conditions: The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource; At the timing of PDCCH monitoring when the DCI indicates no monitoring, if the time domain resources of the terminal are configured as flexible resources, send an SFI indicating uplink resources or flexible resources to the terminal. 2. The sending method according to claim 1, wherein the first PDCCH monitoring opportunity satisfies one of the following conditions: The time domain resources of the terminal are configured as downlink resources; The time domain resources of the terminal are configured as flexible resources. 3. The sending method according to claim 1, wherein the second PDCCH monitoring occasion is a PDCCH monitoring occasion closest to the first PDCCH monitoring occasion. 4. The sending method according to claim 1, wherein the downlink control information DCI instructs the terminal not to monitor the PDCCH through a preset indication field. 5. The sending method according to claim 4, wherein the preset indication field includes N bits, and is used to instruct the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; wherein N is an integer greater than or equal to 1. 6. A method for receiving a physical downlink control channel PDCCH, applied to a terminal, wherein the method comprises: When accessing the synchronization signal SS on the MT side of the integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCH Block conflicts with the first PDCCH monitoring opportunity on the DU side, receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity; Wherein, the DCI is used to instruct the terminal not to perform PDCCH monitoring; The second PDCCH monitoring opportunity meets one of the following conditions: The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource; At the PDCCH monitoring timing when the DCI indicates no monitoring, if the time domain resource of the terminal is configured as a flexible resource, receive the SFI sent by the IAB node indicating that it is an uplink resource or a flexible resource. 7. The receiving method according to claim 6, wherein the first PDCCH monitoring opportunity satisfies one of the following conditions: The time domain resources of the terminal are configured as downlink resources; The time domain resources of the terminal are configured as flexible resources. 8 . The receiving method according to claim 6 , wherein the second PDCCH monitoring occasion is a PDCCH monitoring occasion closest to the first PDCCH monitoring occasion. 9. The receiving method according to claim 6, wherein the downlink control information DCI instructs the terminal not to monitor the PDCCH through a preset indication field. 10. The receiving method according to claim 9, wherein the preset indication field includes N bits for instructing the terminal not to perform PDCCH monitoring for N consecutive PDCCH monitoring opportunities; wherein N is an integer greater than or equal to 1. 11. The receiving method according to claim 9, further comprising: At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as downlink resources, PDCCH monitoring is still performed; At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resources of the terminal are configured as uplink resources, PDCCH monitoring is not performed; At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the time slot format indication SFI indicated as an uplink resource or a flexible resource is received, PDCCH monitoring is not performed; At the N PDCCH monitoring opportunities indicated by the preset indication field, when the time domain resource of the terminal is configured as a flexible resource, and the terminal receives an SFI indicated as an uplink resource or does not receive an SFI, PDCCH monitoring is still performed. 12. An integrated IAB node device for access and backhaul, including a transceiver, wherein the transceiver is used for: When the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side, the transmission of the PDCCH on the DU side is abandoned; At the second PDCCH monitoring opportunity, send downlink control information DCI to the terminal; wherein, the DCI is used to instruct the terminal not to perform PDCCH monitoring; The second PDCCH monitoring opportunity meets one of the following conditions: The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource; At the timing of PDCCH monitoring when the DCI indicates no monitoring, if the time domain resources of the terminal are configured as flexible resources, send an SFI indicating uplink resources or flexible resources to the terminal. 13. A terminal, comprising a transceiver, wherein the transceiver is used for: When accessing the synchronization signal SS on the MT side of the integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCH Block conflicts with the first PDCCH monitoring opportunity on the DU side, receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity; Wherein, the DCI is used to instruct the terminal not to perform PDCCH monitoring; The second PDCCH monitoring opportunity meets one of the following conditions: The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource; At the PDCCH monitoring timing when the DCI indicates no monitoring, if the time domain resource of the terminal is configured as a flexible resource, receive the SFI sent by the IAB node indicating that it is an uplink resource or a flexible resource. 14. A sending device for a physical downlink control channel PDCCH, which is applied to an integrated IAB node for access and backhaul, wherein the device includes: The processing module is used to abandon the transmission of the PDCCH on the DU side when the synchronization signal SS on the MT side or the physical broadcast channel block PBCH Block measurement time configuration SMTC window conflicts with the first PDCCH monitoring opportunity on the DU side; A sending module, configured to send downlink control information DCI to the terminal at a second PDCCH monitoring opportunity; wherein, the DCI is used to instruct the terminal not to perform PDCCH monitoring; The second PDCCH monitoring opportunity meets one of the following conditions: The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource; The sending module is further configured to send an SFI indicating an uplink resource or a flexible resource to the terminal if the time domain resource of the terminal is configured as a flexible resource at a PDCCH monitoring occasion where the DCI indicates no monitoring. 15. A receiving device for a physical downlink control channel PDCCH, applied to a terminal, characterized in that the device includes: The receiving module is used to receive the downlink control information DCI sent by the IAB node at the second PDCCH monitoring opportunity when the synchronization signal SS on the MT side of the integrated IAB node or the measurement time configuration SMTC window of the physical broadcast channel block PBCH Block conflicts with the first PDCCH monitoring opportunity on the DU side; Wherein, the DCI is used to instruct the terminal not to perform PDCCH monitoring; The second PDCCH monitoring opportunity meets one of the following conditions: The time domain resources of the terminal are configured as downlink resources, and the IAB node sends PDCCH on the DU side; the time domain resources of the terminal are configured as flexible resources, the IAB node sends PDCCH on the DU side, and the time slot format sent to the terminal indicates that SFI is a downlink resource; The receiving module is further configured to: at the timing of PDCCH monitoring when the DCI indicates no monitoring, if the time domain resource of the terminal is configured as a flexible resource, receive the SFI sent by the IAB node indicating that it is an uplink resource or a flexible resource. 16. A network device, comprising: a processor, a memory, and a program stored on the memory and operable on the processor, when the program is executed by the processor, the method for sending the PDCCH according to any one of claims 1 to 5 is implemented, or the method for receiving the PDCCH according to any one of claims 6 to 11 is realized. 17. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps in the PDCCH sending method according to any one of claims 1 to 5 are realized, or the steps in the PDCCH receiving method according to any one of claims 6 to 11 are realized.