CN117204049A - Communication method and device - Google Patents

Abstract

The application provides a communication method and a device, wherein the method comprises the following steps: the terminal device transmits a first message to the network device at a first time (S201). If the search space set group switching is triggered and the terminal device listens to the physical downlink control channel based on the first search space set group at the second time, the terminal device switches from being based on the first search space set group to being based on the second search space set group (S202). In the communication system with larger transmission delay such as the NTN network, when the terminal equipment sends the message capable of triggering the search space set grouping switching to the network equipment, the search space set grouping switching is carried out at a second moment after the first moment of sending the message, so that the condition that the terminal equipment and the network equipment understand the used search space set grouping consistently in the period from the time of sending the message to the time of receiving the message by the network equipment is ensured.

Description

Communication methods and devices Technical field

The present application relates to the field of communication technology, and in particular, to a communication method and device.

Background technique

Currently, the 3rd Generation Partnership Project (3GPP) is studying non-terrestrial communication network (Non Terrestrial Network, NTN) technology. NTN generally uses satellite communications to provide communication services to ground users. Compared with terrestrial cellular network communications, satellite communications have the characteristics of not being restricted by user location, high social value, long communication distance, and high communication stability.

In related technology, in order to make the connected terminal equipment more energy-saving, the physical downlink control channel (Physical Downlink Control Channel, PDCCH) monitoring behavior of the terminal can be controlled through the Search Space Set Group (SSSG) switching mechanism to reduce The terminal equipment blindly detects the PDCCH. Specifically, the network device can configure two SSSGs for the terminal device. The first SSSG corresponds to relatively sparse PDCCH monitoring timings, and the second SSSG corresponds to relatively dense PDCCH monitoring timings. Using the second SSSG to monitor the PDCCH can achieve more timely scheduling and reduce service delays; using the first SSSG to monitor the PDCCH can save power for the terminal equipment.

The terminal device can trigger SSSG switching by sending a Scheduling Request (SR) message or a random access request message. In the terrestrial network, the cell coverage is relatively small, and the signal transmission delay between the terminal device and the network device is very short. After the terminal device sends the message, the terminal device can immediately perform SSSG handover. However, in communication systems with large transmission delays such as NTN, if the SSSG handover mechanism of the terrestrial network is used, it may cause the terminal equipment and the network equipment to be incompatible with each other during the period from when the terminal equipment sends a message to when the network equipment receives the message. The search space collection grouping is inconsistently understood.

Application content

Embodiments of the present application provide a communication method and device to solve the problem in the prior art that the terminal device and the network device have inconsistent understanding of the search space set grouping used during the period between the terminal device sending a message and the network device receiving the message.

A first aspect of this application provides a communication method, which method includes:

The terminal device sends the first message to the network device at the first moment;

If search space set grouping switching is triggered, and the terminal device monitors the physical downlink control channel based on the first search space set grouping at the second moment, then the terminal device switches from based on the first search space set grouping to based on the first search space set grouping. The two search space sets monitor the physical downlink control channel in groups.

In an optional implementation manner, the monitoring opportunities of the physical downlink control channels corresponding to the second search space set group are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set group.

In an optional implementation, the first message includes a scheduling request.

In an optional implementation, the first message is in a waiting state at the second moment.

In an optional implementation, the first message includes a random access request.

In an optional implementation, the random access request includes message 1 of four-step random access or message A of two-step random access.

In an optional implementation manner, the first search space set grouping and the second search space set grouping are determined according to the configuration information of the network device.

In an optional implementation, the second time is determined based on the offset of the first time and a target time, or based on a timer started at the first time.

In an optional implementation, the time offset is determined based on the round-trip delay between the terminal device and the network device, or based on the uplink timing advance of the terminal device, or based on the The configuration information sent by the network device is determined, or is the preset information of the terminal device.

In an optional implementation, the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

A second aspect of this application provides a communication method, which method includes:

The network device receives a first message sent by the terminal device at a first moment. The first message triggers a search space set grouping switching. The search space set grouping switching is used to switch the terminal device from a grouping based on the first search space set to a grouping based on the first search space set. The second search space set monitors the physical downlink control channel in groups;

The network device sends response information to the terminal device on the physical downlink control channel.

In an optional implementation manner, the monitoring opportunities of the physical downlink control channels corresponding to the second search space set group are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set group.

In an optional implementation, the first message includes a scheduling request.

In an optional implementation, the first message includes a random access request.

In an optional implementation, the random access request includes message 1 of four-step random access or message A of two-step random access.

In an optional implementation manner, the first search space set grouping and the second search space set grouping are determined according to the configuration information of the network device.

In an optional implementation, the first message is in a waiting state at the second moment.

In an optional implementation, the second time is determined based on the offset of the first time and a target time, or based on a timer started at the first time.

In an optional implementation, the time offset is determined based on the round-trip delay between the terminal device and the network device, or based on the uplink timing advance of the terminal device, or based on the The configuration information sent by the network device is determined, or is the preset information of the terminal device.

In an optional implementation, the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

A third aspect of the present application provides a communication device, which includes:

A sending module, configured to send the first message to the network device at the first moment;

A processing module configured to switch from grouping based on the first search space set to grouping based on the first search space set if the switching of the search space set grouping is triggered, and the communication device monitors the physical downlink control channel based on the first search space set grouping at the second moment. The second search space set monitors the physical downlink control channel in groups.

In an optional implementation manner, the monitoring opportunities of the physical downlink control channels corresponding to the second search space set group are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set group.

In an optional implementation, the first message includes a scheduling request.

In an optional implementation, the first message is in a waiting state at the second moment.

In an optional implementation, the first message includes a random access request.

In an optional implementation, the random access request includes message 1 of four-step random access or message A of two-step random access.

In an optional implementation manner, the first search space set grouping and the second search space set grouping are determined according to the configuration information of the network device.

In an optional implementation, the second time is determined based on the offset of the first time and a target time, or based on a timer started at the first time.

In an optional implementation, the time offset is determined based on the round-trip delay between the communication device and the network device, or based on the uplink timing advance of the communication device, or based on the The configuration information sent by the network device is determined, or is the preset information of the terminal device.

In an optional implementation, the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

A fourth aspect of the present application provides a communication device, which includes:

A receiving module, configured to receive a first message sent by the terminal device at the first moment, the first message triggering a search space set group switching, and the search space set group switching is used to switch the terminal device from a group based on the first search space set to Switch to monitoring the physical downlink control channel based on the second search space set group.

A sending module, configured to send response information to the terminal device on the physical downlink control channel.

In an optional implementation manner, the monitoring opportunities of the physical downlink control channels corresponding to the second search space set group are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set group.

In an optional implementation, the first message includes a scheduling request.

In an optional implementation, the first message includes a random access request.

In an optional implementation, the random access request includes message 1 of four-step random access or message A of two-step random access.

In an optional implementation, the first search space set grouping and the second search space set grouping are determined according to the configuration information of the communication device.

In an optional implementation, the first message is in a waiting state at the second moment.

In an optional implementation, the second time is determined based on the offset of the first time and a target time, or based on a timer started at the first time.

In an optional implementation, the time offset is determined based on the round-trip delay between the terminal equipment and the communication device, or based on the uplink timing advance of the terminal equipment, or based on the The configuration information sent by the communication device is determined, or is the preset information of the terminal device.

In an optional implementation, the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

The fifth aspect of this application provides a terminal device, including:

Processors, memories, receivers, and interfaces for communicating with network devices;

The memory stores computer execution instructions;

The processor executes the computer execution instructions stored in the memory, so that the processor executes the communication method as described in the first aspect.

A sixth aspect of this application provides a network device, which is characterized by including:

Processors, memories, transmitters, and interfaces for communication with end devices;

The memory stores computer execution instructions;

The processor executes the computer execution instructions stored in the memory, so that the processor executes the communication method as described in the second aspect.

A seventh aspect of the present application provides a chip, including: a processor configured to call and run a computer program from a memory, so that a device installed with the chip executes the method described in the first aspect.

An eighth aspect of this application provides a chip, including: a processor configured to call and run a computer program from a memory, so that a device installed with the chip executes the method described in the second aspect.

A ninth aspect of the present application provides a computer-readable storage medium for storing a computer program, the computer program causing a computer to execute the method as described in the first aspect.

A tenth aspect of the present application provides a computer-readable storage medium for storing a computer program, the computer program causing a computer to perform the method described in the first or second aspect.

An eleventh aspect of the present application provides a computer program product, which includes computer instructions. When the computer instructions are executed by a processor, the method described in the first aspect is implemented.

A twelfth aspect of the present application provides a computer program product, which includes computer instructions. When the computer instructions are executed by a processor, the method described in the second aspect is implemented.

A thirteenth aspect of the present application provides a computer program, which causes a computer to execute the method described in the first aspect.

A fourteenth aspect of the present application provides a computer program, which causes a computer to execute the method described in the second aspect.

In the communication method and device provided by the embodiments of the present application, the terminal device sends the first message to the network device at the first moment. If the search space set grouping switching is triggered, and the terminal device monitors the physical downlink control channel based on the first search space set grouping at the second time, the terminal device switches from monitoring the physical downlink control channel based on the first search space set grouping to the second search space set grouping. Downlink control channel. In this way, in communication systems with large transmission delays such as NTN networks, when the terminal device sends a message to the network device that can trigger search space set group switching, the search is performed at the second moment after the first moment when the message is sent. Switching of space set groups ensures that during the period from when the terminal device sends a message to when the network device receives the message, the terminal device and the network device have a consistent understanding of the search space set group used.

Description of the drawings

In order to explain the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are of the present invention. For some embodiments of the invention, those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting any creative effort.

Figure 1 is a schematic diagram of a timer startup provided by an embodiment of the present application;

Figure 2 is a schematic diagram of a communication method provided by an embodiment of the present application;

Figure 3 is a signaling interaction diagram of a communication method provided by an embodiment of the present application;

Figure 4 is a schematic flow chart of a communication method provided by an embodiment of the present application;

Figure 5 is a schematic diagram of SSSG switching when a terminal device sends an SR according to an embodiment of the present application;

Figure 6 is a schematic diagram of SSSG switching when another terminal device sends an SR according to an embodiment of the present application;

Figure 7 is a schematic diagram of SSSG switching when another terminal device sends SR according to the embodiment of the present application;

Figure 8 is a schematic flow chart of another communication method provided by an embodiment of the present application;

Figure 9 is a schematic diagram of SSSG switching when a terminal device sends a random access request according to an embodiment of the present application;

Figure 10 is a schematic flowchart of yet another communication method provided by an embodiment of the present application;

Figure 11 is a schematic diagram of SSSG switching when another terminal device sends a random access request according to an embodiment of the present application;

Figure 12 is a schematic diagram of SSSG switching when another terminal device sends a random access request according to the embodiment of the present application;

Figure 13 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

Figure 14 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

Figure 15 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are Invent some embodiments, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

The terms "first", "second", etc. in the description, claims, and above-mentioned drawings of the embodiments of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the application described herein can, for example, be practiced in sequences other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus that encompasses a series of steps or units and need not be limited to those explicitly listed. Those steps or elements may instead include other steps or elements not expressly listed or inherent to the process, method, product or apparatus.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this article is just an association relationship that describes related objects, indicating that three relationships can exist. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and they exist alone. B these three situations. In addition, the character "/" in this article generally indicates that the related objects are an "or" relationship.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

First, NTN technology is introduced.

Currently 3GPP is studying NTN technology. NTN generally uses satellite communications to provide communication services to ground users. Compared with terrestrial cellular network communication, satellite communication has the following advantages: First, satellite communication is not restricted by the user's location. General land communications cannot cover areas such as oceans, mountains, deserts, etc. where communication equipment cannot be installed or where communication coverage is not available due to sparse population. However, for satellite communications, one satellite can cover a large area of the ground, and satellites can It orbits the earth, so theoretically every corner of the earth can be covered by satellite communications. Secondly, satellite communications have high social value. Satellite communications can cover remote mountainous areas and poor and backward countries or regions at a lower cost, allowing the above-mentioned areas to enjoy advanced voice communications and mobile Internet technologies, which is conducive to narrowing the digital gap with developed areas and promoting the development of these areas. development of. Finally, satellite communication has a long distance, and the cost of communication does not increase significantly as the communication distance increases. Finally, satellite communications have high stability and are not limited by natural disasters.

At present, communication satellites in NTN technology can be divided into Low-Earth Orbit (LEO) satellites, Medium-Earth Orbit (MEO) satellites, and Geostationary Earth Orbit (Geostationary Earth Orbit) according to different orbital altitudes. GEO) satellites and highly elliptical orbit (High Elliptical Orbit, HEO) satellites. Among them, LEO satellites and GEO satellites are the main research directions.

The altitude range of LEO satellites is 500km to 1500km, and the corresponding orbital period is about 1.5 hours to 2 hours. The signal propagation delay of single-hop communication between users is generally less than 20ms. The maximum satellite visibility time is 20 minutes. The signal propagation distance is short, the link loss is small, and the transmission power requirements of the user terminal are not high.

The GEO satellite has an orbital altitude of 35,786km and a rotation period of 24 hours around the earth. The signal propagation delay for single-hop communication between users is generally 250ms.

In order to ensure satellite coverage and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. One satellite can form dozens or even hundreds of beams to cover the ground; one satellite beam can cover dozens to hundreds of kilometers in diameter. Ground area.

Next, DRX will be explained.

In 5G New Radio (NR), the network equipment can configure the DRX function for the terminal equipment, so that the terminal monitors the PDCCH discontinuously to achieve the purpose of power saving for the terminal equipment. If the terminal device is configured with DRX, the terminal device needs to listen to the PDCCH during the DRX Active Time. DRX Active Time includes the following three situations:

In the first case, any of the five timers (drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL and ra-ContentionResolutionTimer) configured in the DRX configuration parameters is running.

In the second case, the terminal device sends an SR on the PUCCH and is in a waiting state.

In the third case, during the non-contention-based random access process, the terminal device has not received the Cell Radio Network Temporary Identifier (C-RNTI) scrambling after successfully receiving the random access response. An initial transmission indicated by the PDCCH.

Among them, the timer drx-onDurationTimer is used to count the duration of the terminal device waking up at the beginning of a DRX cycle (DRX Cycle). The terminal device can decide the time to start drx-onDurationTimer based on whether it is currently in a short DRX cycle (short DRX cycle) or a long DRX cycle (long DRX cycle).

Figure 1 is a schematic diagram of a timer startup provided by an embodiment of the present application. As shown in Figure 1, during the duration of the terminal device monitoring PDCCH, if short DRX cycle is used, and the current subframe satisfies formula (1), or if long DRX cycle is used, and the current subframe satisfies formula (1) 2), then drx-onDurationTimer is started at the moment drx-SlotOffset slots after the beginning of the current subframe. Formula (1) and formula (2) are as follows: [(SFN×10)+subframe number]modulo(drx-ShortCycle)=(drx-StartOffset)modulo(drx-ShortCycle) (1)

[(SFN×10)+subframe number]modulo(drx-LongCycle)＝drx-StartOffset (2)

Among them, SFN is the system frame number (SFN), modulo is the module calculation, subframe number is the subframe number, and drx-StartOffset is the subframe offset at the beginning of the DRX Cycle.

SR will be explained again.

The terminal device can apply for uplink resources from the network device through SR. Since the network device cannot determine when an SR occurs in the terminal device, the network device may allocate periodic PUCCH resources for transmitting SR to the terminal device. Subsequently, the network device detects whether there is an SR report on the PUCCH resources that have been allocated for transmitting the SR.

It should be understood that SR in NR is based on logical channels. For each uplink logical channel, the network device can choose whether to configure PUCCH resources for transmitting SR for the uplink logical channel. When an uplink logical channel triggers an SR, if the network device configures the PUCCH resource for transmitting SR for the uplink logical channel, the terminal sends the SR on the PUCCH resource for transmitting SR corresponding to the logical channel; otherwise , the terminal device can initiate random access.

In addition, the terminal device can also trigger SR in the following two ways.

In the first method, if the terminal equipment triggers Beam Failure Recovery (BFR) on at least one secondary serving cell (Secondary Cell, SCell), and the terminal equipment currently has no uplink resources or terminal equipment available for initial transmission, When there are currently uplink resources available for initial transmission but the resources are insufficient to carry BFR Medium Access Control Communication Edge (MAC CE) or reduced buffer status report (Buffer Status Report, BSR) MAC CE, the terminal device SR will be triggered.

In the second method, if the terminal device triggers continuous listen before talk (LBT) on at least one SCell and fails, and the terminal device currently has no uplink resources available for initial transmission or the terminal device currently has available When the uplink resources for initial transmission are insufficient to carry LBT MAC CE and fail, the terminal device will trigger SR.

In addition, the network device can configure multiple PUCCH resources for transmitting SR for the terminal device. For an uplink logical channel, if the network device configures the PUCCH resource for transmitting SR for the uplink logical channel, then on each uplink working bandwidth (Bandwidth Part, BWP), the network device configures at most one PUCCH resource for the logical channel for transmitting SR. PUCCH resources for transmitting SR. The configuration parameters corresponding to each PUCCH resource used to transmit SR include: PUCCH resource period and time slot/time symbol offset, and PUCCH resource index.

Finally, the SSSG switching is explained.

In related technology, in order to make the connected terminal equipment more energy-saving, the physical downlink control channel (Physical Downlink Control Channel, PDCCH) monitoring behavior of the terminal can be controlled through the Search Space Set Group (SSSG) switching mechanism to reduce The terminal equipment blindly detects the PDCCH. Specifically, the network device can configure two SSSGs for the terminal device. The first SSSG corresponds to relatively sparse PDCCH monitoring timings, and the second SSSG corresponds to relatively dense PDCCH monitoring timings. Using the second SSSG to monitor the PDCCH can achieve more timely scheduling and reduce service delays; using the first SSSG to monitor the PDCCH can save power for the terminal equipment.

Currently, SSSG handover triggering methods mainly include network equipment instructing terminal equipment to perform SSSG handover or terminal equipment actively triggering SSSG handover.

For the way in which the network device instructs the terminal device to perform SSSG switching, the network device can send dynamic signaling to instruct the terminal device which SSSG to use to monitor the PDCCH. When the terminal device receives dynamic signaling indicating SSSG switching, the terminal device may perform SSSG switching based on the dynamic signaling.

The method for the terminal device to actively trigger SSSG handover is mainly applicable when the terminal device sends an SR to the network device or the terminal device triggers a random access channel (Random Access Channel, RACH).

When the terminal device expects a response from the network device after sending a message such as an SR or a random access request, the terminal device has an urgent need to monitor the PDCCH. Therefore, if the terminal equipment is currently using a relatively sparse SSSG for PDCCH monitoring, after the UE sends an SR or a random access request, the terminal equipment needs to switch to a relatively dense SSSG for PDCCH monitoring. From the perspective of the network device, the network device can learn the scheduling requirements of the terminal device only after receiving the uplink transmission message of the terminal device. Before the network device receives the uplink transmission message of the terminal device, the network device cannot Know the scheduling requirements of the terminal device.

In the terrestrial network, the cell coverage is relatively small, and the signal transmission delay between the terminal device and the network device is very short. After the terminal device sends the message, the terminal device can immediately perform SSSG handover. However, in communication systems with large transmission delays such as NTN, if the SSSG handover mechanism of the terrestrial network is used, it may cause the terminal equipment and the network equipment to be incompatible with each other during the period from when the terminal equipment sends a message to when the network equipment receives the message. The search space collection grouping is inconsistently understood. At the same time, premature switching of terminal equipment to dense SSSG will also increase unnecessary power consumption of terminal equipment.

In order to solve the above technical problems, embodiments of the present application provide a communication method and device. After the terminal device sends a message that can trigger search space set group switching to the network device, the terminal device switches from the first search to the network device after a preset time interval. The space set grouping is switched to monitor the physical downlink control channel based on the second search space set grouping, thereby ensuring that during the period from the terminal device sending the message to the network device receiving the message, the terminal device and the network device are aware of the search space set grouping used. Consistent understanding.

It should be noted that, in addition to the NTN communication system, the technical solutions of the embodiments of the present application can be applied to various communication systems, and the embodiments of the present application do not limit this. For example: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, general packet wireless service (General Packet Radio Service, GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, advanced long-term Evolution (Advanced long term evolution, LTE-A) system, New Radio (NR) system, evolution system of NR system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed frequency band, NR (NR-based access to unlicensed spectrum, NR-U) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system on the unlicensed frequency band , Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), next-generation communication systems or other communication systems, etc.

The application scenarios of this application are illustrated below with examples.

Figure 2 is a schematic diagram of a communication method provided by an embodiment of the present application. As shown in Figure 2, the process of switching search space set groups is performed for the terminal device 101. After the terminal device 101 sends a message such as an SR or a random access request to the network device 102 at the first moment, if the message can trigger the search space set group switching, the terminal device 102 switches from grouping based on the first search space set at the second moment. Switch to monitoring the physical downlink control channel based on the second search space set group. At the same time, after receiving the message sent by the terminal device 101, the network device 102 sends response information to the terminal device 101 on the physical downlink control channel.

The mobile terminal 11 includes, but is not limited to, a satellite or cellular phone, a Personal Communications System (PCS) terminal that can combine cellular radiotelephone with data processing, fax and data communication capabilities; it can include a radiotelephone, a pager, an Internet/ PDAs with intranet access, Web browsers, planners, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or handheld receivers or including radiotelephone transceivers Other electronic devices. Terminal equipment may refer to access terminal, user equipment (User Equipment, UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or User device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a device with wireless communications Functional handheld devices, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in 5G networks or terminal devices in future evolved PLMNs, etc.

The network device 12 may provide communication coverage for a specific geographical area and may communicate with terminal devices located within the coverage area. Optionally, the network device 102 may be a base station (Base Transceiver Station, BTS) in the GSM system or CDMA system, a base station (NodeB, NB) in the WCDMA system, or an evolved base station in the LTE system. (Evolutional Node B, eNB or eNodeB), or a wireless controller in the Cloud Radio Access Network (Cloud Radio Access Network, CRAN), or the network device can be a mobile switching center, relay station, access point, vehicle-mounted equipment, Wearable devices, hubs, switches, bridges, routers, network equipment in 5G networks or network equipment in future evolved Public Land Mobile Networks (PLMN), etc.

The following uses terminal equipment and network equipment as examples to describe in detail the technical solutions of the embodiments of the present application using specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

Figure 3 is a signaling interaction diagram of a communication method provided by an embodiment of the present application. The execution entities of the embodiments of this application are terminal devices and network devices, and relate to the specific process of how the terminal device switches search space set groups. As shown in Figure 3, the method includes:

S201. The terminal device sends the first message to the network device at the first moment.

In this embodiment of the present application, the SSSG switching of the terminal device can be triggered by an instruction from the network device, or the terminal device can actively perform SSSG switching. Wherein, the terminal device actively performing SSSG handover can be triggered by sending a first message to the network device.

The embodiment of the present application does not limit the type of message that can trigger the terminal device to actively perform SSSG switching. For example, the first message includes a scheduling request (Scheduling Request, SR) and a random access request.

In some embodiments, the random access request may be sent to the network device after the terminal device triggers a random access (Random Access Channel, RACH). The random access request includes message 1 (msg1) of four-step random access or message A (msgA) of two-step random access. This embodiment of the present application does not limit this.

It should be understood that the first time involved in the embodiment of the present application is used to represent the time when the terminal device sends the first message. The embodiment of the present application does not limit the value of the first time, and it can be any time.

S202. If search space set grouping switching is triggered, and the terminal device monitors the physical downlink control channel based on the first search space set grouping at the second time, the terminal device switches from grouping based on the first search space set to grouping based on the second search space set. Monitor the physical downlink control channel.

In this step, after the terminal device sends the first message to the network device, the terminal device can determine whether the first message can trigger SSSG switching. If it can trigger SSSG switching, the terminal device switches from switching based on the first SSSG at the second moment. The physical downlink control channel is monitored based on the second SSSG. After receiving the first message sent by the terminal device, the network device may send response information to the terminal device on the PDCCH.

The conditions for terminal equipment to trigger SSSG switching are first described below.

It should be understood that in this embodiment of the present application, the terminal device triggering SSSG switching may include the following two conditions.

The first condition is that the first message sent by the terminal device can trigger SSSG switching. For example, both SR and random access requests can trigger SSSG handover. Among them, the random access request is sent after the terminal device triggers RACH.

It should be noted that the embodiment of the present application does not impose any restrictions on what reasons trigger SR and RACH to further trigger SSSG handover. In some embodiments, SR and RACH triggered by any reason can further trigger SSSG switching. In other embodiments, only SR and RACH triggered by specific reasons can further trigger SSSG switching. For example, when RACH is triggered due to BFR, SSSG switching may be triggered.

The second condition is that at the second time after the first time corresponding to sending the first message, the terminal device monitors the physical downlink control channel based on the first SSSG.

If the above two conditions are met, the terminal device can perform SSSG handover at the second moment.

In some embodiments, if the first message sent by the terminal device is SR, before the terminal device performs SSSG handover, it also needs to verify whether the third condition is met, that is, whether the SR is in a waiting state at the second moment. If yes, the third condition is met, and the terminal device can perform SSSG handover at the second moment.

In some embodiments, if the first message sent by the terminal device is a random access request, before the terminal device performs SSSG handover, it can also be verified whether the third condition is met, that is, whether the terminal device has not received the request at the second moment. Response from a network device to a random access request. If yes, the third condition is met, and the terminal device can perform SSSG handover at the second moment.

It should be understood that the embodiments of the present application do not limit the value of the second time. In some embodiments, the second time can be determined based on the first time and the target time offset. For example, t2=t1+offset. Among them, t2 is the second time, t1 is the first time, and offset is the target time offset.

In other embodiments, the second time can also be determined based on the timer started at the first time.

It should be noted that the above target time offset can be determined by the terminal device according to the actual situation, and the embodiment of the present application does not limit this. There are three ways to determine the target time offset.

For example, the terminal device may determine the value of offset based on the round-trip time (RTT) of signal transmission between the terminal device and the network device. That is, offset is equal to the RTT from the terminal device to the network device.

For example, the terminal device may determine the value of offset based on the uplink timing advance (time advance TA) of the terminal device. That is, offset is equal to the TA of the terminal device.

For example, the terminal device can determine the offset value through the configuration information sent by the network device. The above configuration information is carried in broadcast or Radio Resource Control (Radio Resource Control, RRC) signaling or MAC CE or physical downlink control channel.

For example, the value of offset may be preset information of the terminal device.

In some embodiments, the first SSSG and the second SSSG are configured by the network device. Before the terminal device sends the first message to the network device, the network device may send configuration information to the terminal device to pre-configure the first SSSG and the second SSSG.

It should be noted that the embodiment of the present application does not place any restrictions on the configuration parameters of the first SSSG and the second SSSG, and they can be specifically set according to the actual situation.

Furthermore, in some embodiments, the monitoring opportunities of the PDCCH corresponding to the second SSSG may be denser than the monitoring opportunities of the PDCCH corresponding to the first SSSG. In the existing technology, the terminal device immediately switches to monitoring the PDCCH based on the second SSSG after sending the first message that can trigger the SSSG switching. In this application, the terminal device switches to monitoring the PDCCH based on the second SSSG at the second moment after sending the first message that can trigger SSSG switching. Therefore, in this application, between the first time and the second time, the terminal device still monitors the PDCCH based on the first SSSG, because the monitoring opportunities of the PDCCH corresponding to the second SSSG may be denser than the monitoring opportunities of the PDCCH corresponding to the first SSSG. , thereby reducing unnecessary energy consumption of terminal equipment. Through the above communication method, the scheduling performance of the terminal device can be ensured, while the power saving requirements of the terminal device can be taken into consideration.

In the communication method provided by the embodiment of the present application, the terminal device sends the first message to the network device at the first moment. If the search space set grouping switching is triggered, and the terminal device monitors the physical downlink control channel based on the first search space set grouping at the second time, the terminal device switches from monitoring the physical downlink control channel based on the first search space set grouping to the second search space set grouping. Downlink control channel. In this way, in communication systems with large transmission delays such as NTN networks, when the terminal device sends a message to the network device that can trigger search space set group switching, the search is performed at the second moment after the first moment when the message is sent. Switching of space set groups ensures that during the period from when the terminal device sends a message to when the network device receives the message, the terminal device and the network device have a consistent understanding of the search space set group used.

Based on the above embodiments, the following will provide a detailed description of how the terminal device performs SSSG handover when the terminal device sends an SR to the network device. Figure 4 is a schematic flowchart of a communication method provided by an embodiment of the present application. Figure 5 is a schematic diagram of SSSG switching when a terminal device sends an SR according to an embodiment of the present application. As shown in Figures 4 and 5, the method includes:

S301. The terminal device sends an SR to the network device at the first moment.

S302. The terminal device determines whether the SR is one of the triggering conditions of the SSSG.

If yes, execute step S303; if not, execute step S306.

S303. The terminal device determines whether the SR is in the Pending state at the second moment.

If yes, execute step S304; if not, execute step S306.

The second time may be determined based on the offset between the first time and the target time, or may be determined based on a timer started at the first time, which is not limited in the embodiments of the present application.

The time offset may be determined based on the RTT of the terminal device and the network device, or may be determined based on the TA of the terminal device, or based on the configuration information sent by the network device, or it may be preset information of the terminal device. Configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

S304. The terminal device determines whether to monitor the PDCCH based on the first SSSG at the second moment.

If yes, execute step S305; if not, execute step S306.

S305. The terminal device switches from monitoring the PDCCH based on the first SSSG to monitoring the PDCCH based on the second SSSG.

The first SSSG and the second SSSG are determined based on the configuration information of the network device. The monitoring opportunities of the PDCCH corresponding to the second SSSG are denser than the monitoring opportunities of the PDCCH corresponding to the first SSSG.

S306. The terminal device monitors the PDCCH based on the currently activated or used SSSG.

Based on Figure 4 and Figure 5, the following provides two other processes for terminal equipment to send SR to trigger SSSG handover.

Figure 6 is a schematic diagram of SSSG switching when another terminal device sends an SR according to an embodiment of the present application. As shown in Figure 6, the terminal device sends an SR to the network device at time t1. Since sending an SR to the network device is one of the conditions for triggering SSSG switching, the terminal device is prepared to switch from monitoring the PDCCH based on the first SSSG to monitoring the PDCCH based on the second SSSG at time t2, which is offset from time t1. However, if the terminal device receives an uplink scheduling grant (Uplink grant, UL grant) at time t3 between time t1 and time t2, the terminal device cancels the SR before time t2. Correspondingly, the terminal equipment does not perform SSSG switching at time t2 and continues to use the first SSSG to monitor the PDCCH.

FIG. 7 is a schematic diagram of SSSG switching when a terminal device sends an SR according to an embodiment of the present application. As shown in Figure 7, the terminal device sends an SR to the network device at time t1. Since sending an SR to the network device is one of the conditions for triggering SSSG switching, the terminal device is prepared to switch from monitoring the PDCCH based on the first SSSG to monitoring the PDCCH based on the second SSSG at time t2, which is offset from time t1. However, if the terminal device receives a signaling instruction from the network device at time t3 between time t1 and time t2, instructing the terminal device to switch from monitoring the PDCCH based on the first SSSG to based on the second SSSG, the terminal device immediately performs the monitoring at time t3. SSSG switching. Correspondingly, the terminal equipment always performs SSSG handover at time t2 and continues to use the second SSSG to monitor the PDCCH.

Based on the above embodiments, the following is a detailed description of how the terminal device performs SSSG handover when the terminal device sends a random access request to the network device. Figure 8 is a schematic flowchart of another communication method provided by an embodiment of the present application. Figure 9 is a schematic diagram of SSSG switching when a terminal device sends a random access request according to an embodiment of the present application. As shown in Figures 8 and 9, the method includes:

S401. The terminal device sends a random access request to the network device at the first moment.

The random access request is sent to the network device after the terminal device triggers RACH.

It should be noted that the embodiment of the present application does not impose any restrictions on what reasons trigger RACH to further trigger SSSG handover. In some embodiments, RACH triggered by any reason can further trigger SSSG switching. In other embodiments, only RACH triggered by specific reasons can further trigger SSSG switching. For example, when RACH is triggered due to BFR, SSSG switching may be triggered.

The embodiment of this application does not limit the type of random access request. For example, if the terminal device performs four-step random access, the terminal device sends msg1 to the network device; if the terminal device performs two-step random access, the terminal device sends msgA to the network device.

S402. The terminal device determines whether the random access request is one of the triggering conditions of the SSSG.

If yes, execute step S403; if not, execute step S305.

S403. The terminal device determines whether to monitor the PDCCH based on the first SSSG at the second moment.

If yes, execute step S404; if not, execute step S305.

The second time may be determined based on the offset between the first time and the target time, or may be determined based on a timer started at the first time, which is not limited in the embodiments of the present application.

The time offset may be determined based on the RTT of the terminal device and the network device, or may be determined based on the TA of the terminal device, or based on the configuration information sent by the network device, or it may be preset information of the terminal device. Configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

S404. The terminal device switches from monitoring the PDCCH based on the first SSSG to monitoring the PDCCH based on the second SSSG.

The first SSSG and the second SSSG are determined based on the configuration information of the network device. The monitoring opportunities of the PDCCH corresponding to the second SSSG are denser than the monitoring opportunities of the PDCCH corresponding to the first SSSG.

S405. The terminal device monitors the PDCCH based on the currently activated or used SSSG.

Based on the above embodiments, FIG. 10 is a schematic flowchart of yet another communication method provided by embodiments of the present application. As shown in Figure 10, when the first message is a random access request, the terminal device determines whether to perform SSSG handover based on three conditions. The method includes:

S501. The terminal device sends a random access request to the network device at the first moment.

The random access request is sent to the network device after the terminal device triggers RACH.

It should be noted that the embodiment of the present application does not impose any restrictions on what reasons trigger RACH to further trigger SSSG handover. In some embodiments, RACH triggered by any reason can further trigger SSSG switching. In other embodiments, only RACH triggered by specific reasons can further trigger SSSG switching. For example, when RACH is triggered due to BFR, SSSG switching may be triggered.

The embodiment of this application does not limit the type of random access request. For example, if the terminal device performs four-step random access, the terminal device sends msg1 to the network device; if the terminal device performs two-step random access, the terminal device sends msgA to the network device.

S502. The terminal device determines whether the random access request is one of the triggering conditions of the SSSG.

If yes, execute step S503; if not, execute step S506.

S503. The terminal device determines whether it has received a response to the random access request sent by the network device before the second time.

If yes, execute step S504; if not, execute step S506.

The second time may be determined based on the offset between the first time and the target time, or may be determined based on a timer started at the first time, which is not limited in the embodiments of the present application.

The time offset may be determined based on the RTT of the terminal device and the network device, or may be determined based on the TA of the terminal device, or based on the configuration information sent by the network device, or it may be preset information of the terminal device. Configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

S504. The terminal device determines whether to monitor the PDCCH based on the first SSSG at the second moment.

If yes, execute step S505; if not, execute step S506.

S505. The terminal equipment switches from monitoring the PDCCH based on the first SSSG to monitoring the PDCCH based on the second SSSG.

The first SSSG and the second SSSG are determined based on the configuration information of the network device. The monitoring opportunities of the PDCCH corresponding to the second SSSG are denser than the monitoring opportunities of the PDCCH corresponding to the first SSSG.

S506. The terminal device monitors the PDCCH based on the currently activated or used SSSG.

Based on Figure 8-10, the following provides the process for two other terminal devices to send random access requests to trigger SSSG handover.

Figure 11 is a schematic diagram of SSSG switching when another terminal device sends a random access request according to an embodiment of the present application. As shown in Figure 11, the terminal device sends a random access request to the network device at time t1. Since sending a random access request to the network device is one of the conditions for triggering SSSG switching, the terminal device is prepared to switch from monitoring the PDCCH based on the first SSSG to monitoring the PDCCH based on the second SSSG at time t2, which is offset from time t1. However, if the terminal device receives an uplink scheduling grant (UL grant) at time t3 between time t1 and time t2, the terminal device does not perform SSSG switching at time t2 and continues to use the first SSSG to monitor the PDCCH.

Figure 12 is a schematic diagram of SSSG switching when another terminal device sends a random access request according to the embodiment of the present application. As shown in Figure 12, the terminal device sends a random access request to the network device at time t1. Since sending a random access request to the network device is one of the conditions for triggering SSSG switching, the terminal device is prepared to switch from monitoring the PDCCH based on the first SSSG to monitoring the PDCCH based on the second SSSG at time t2, which is offset from time t1. However, if the terminal device receives a signaling instruction from the network device at time t3 between time t1 and time t2, instructing the terminal device to switch from monitoring the PDCCH based on the first SSSG to based on the second SSSG, the terminal device immediately performs the monitoring at time t3. SSSG switching. Correspondingly, the terminal equipment always performs SSSG handover at time t2 and continues to use the second SSSG to monitor the PDCCH.

In the communication method provided by the embodiment of the present application, the terminal device sends the first message to the network device at the first moment. If the condition that triggers the search space set grouping switch includes the first message, and the terminal device monitors the physical downlink control channel based on the first search space set grouping at the second moment, the terminal device switches from the first search space set grouping to the second search space set grouping. The search space set group monitors the physical downlink control channel. In this way, in communication systems with large transmission delays such as NTN networks, when the terminal device sends a message to the network device that can trigger search space set group switching, the search is performed at the second moment after the first moment when the message is sent. Switching of space set groups ensures that during the period from when the terminal device sends a message to when the network device receives the message, the terminal device and the network device have a consistent understanding of the search space set group used.

Those of ordinary skill in the art can understand that all or part of the steps to implement the above method embodiments can be completed through hardware related to program information. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, It includes the steps of the above method embodiment; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Figure 13 is a schematic structural diagram of a communication device provided by an embodiment of the present application. The communication device can be implemented by software, hardware, or a combination of both, to execute the communication method on the terminal device side in the above embodiment. As shown in Figure 13, the communication device 600 includes: a sending module 601 and a processing module 602.

The sending module 601 is used to send the first message to the network device at the first moment;

Processing module 602, configured to switch from grouping based on the first search space set to grouping based on the second search space if the search space set grouping switching is triggered and the communication device monitors the physical downlink control channel based on the first search space set grouping at the second time. The collective group monitors the physical downlink control channel.

In an optional implementation manner, the monitoring opportunities of the physical downlink control channels corresponding to the second search space set group are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set group.

In an optional implementation, the first message includes a scheduling request.

In an optional implementation, the first message is in a waiting state at the second moment.

In an optional implementation, the first message includes a random access request.

In an optional implementation manner, the random access request includes a first message of four-step random access or a second message of two-step random access.

In an optional implementation manner, the first search space set grouping and the second search space set grouping are determined according to the configuration information of the network device.

In an optional implementation, the second time is determined based on the offset of the first time and the target time, or based on a timer started at the first time.

In an optional implementation, the time offset is determined based on the round-trip delay between the communication device and the network device, or based on the uplink timing advance of the communication device, or based on the configuration information sent by the network device, or, is the preset information of the terminal device.

In an optional implementation, the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

The communication device provided by the embodiment of the present application can perform the actions of the communication method on the terminal device side in the above embodiment. Its implementation principles and technical effects are similar and will not be described again here.

Figure 14 is a schematic structural diagram of another communication device provided by an embodiment of the present application. The communication device can be implemented by software, hardware, or a combination of both, to execute the communication method on the network device side in the above embodiment. As shown in Figure 14, the communication device 700 includes: a receiving module 701 and a sending module 702.

The receiving module 701 is configured to receive the first message sent by the terminal device at the first moment. The first message triggers search space set grouping switching. The search space set grouping switching is used to switch the terminal device from grouping based on the first search space set to grouping based on the first search space set. The second search space set monitors the physical downlink control channel in groups.

The sending module 702 is configured to send response information to the terminal device on the physical downlink control channel.

In an optional implementation manner, the monitoring opportunities of the physical downlink control channels corresponding to the second search space set group are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set group.

In an optional implementation, the first message includes a scheduling request.

In an optional implementation, the first message includes a random access request.

In an optional implementation manner, the random access request includes a first message of four-step random access or a second message of two-step random access.

In an optional implementation, the first search space set grouping and the second search space set grouping are determined according to the configuration information of the communication device.

In an optional implementation, the first message is in a waiting state at the second moment.

In an optional implementation, the second time is determined based on the offset of the first time and the target time, or based on a timer started at the first time.

In an optional implementation, the time offset is determined based on the round-trip delay between the terminal equipment and the communication device, or based on the uplink timing advance of the terminal equipment, or based on the configuration information sent by the communication device, or, is the preset information of the terminal device.

In an optional implementation, the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels.

The communication device provided by the embodiment of the present application can perform the actions of the communication method on the network device side in the above embodiment. Its implementation principles and technical effects are similar and will not be described again here.

Figure 15 is a schematic structural diagram of an electronic device provided by an embodiment of the present application. As shown in Figure 15, the electronic device may include: a processor 81 (such as a CPU), a memory 82, a receiver 83 and a transmitter 84; the receiver 83 and the transmitter 84 are coupled to the processor 81, and the processor 81 controls the receiver 83, the processor 81 controls the sending action of the transmitter 84. The memory 82 may include high-speed RAM memory, and may also include non-volatile memory NVM, such as at least one disk memory. Various information may be stored in the memory 82 to complete various processing functions and implement the methods of the embodiments of the present application. step. Optionally, the electronic device involved in the embodiment of the present application may also include: a power supply 85 , a communication bus 86 and a communication port 88 . The receiver 83 and the transmitter 84 can be integrated in the transceiver of the electronic device, or they can be independent transceiver antennas on the electronic device. The communication bus 86 is used to implement communication connections between components. The above-mentioned communication port 88 is used to realize connection and communication between the electronic device and other peripheral devices.

In this embodiment of the present application, the above-mentioned memory 82 is used to store computer executable program code, and the program code includes information; when the processor 81 executes the information, the information causes the processor 81 to perform the processing actions on the terminal device side in the above method embodiment, The transmitter 84 is caused to perform the sending action on the terminal device side in the above method embodiment, and the receiver 83 is made to perform the receiving action on the terminal device side in the above method embodiment. The implementation principles and technical effects are similar and will not be described again here.

Or, when the processor 81 executes the information, the information causes the processor 81 to perform the processing action on the network device side in the above method embodiment, causes the sender 84 to perform the sending action on the network device side in the above method embodiment, and causes the receiver 83 to perform The implementation principles and technical effects of the receiving action on the network device side in the above method embodiment are similar and will not be described again here.

An embodiment of the present application also provides a communication system, including a terminal device and a network device, to perform the above communication method.

An embodiment of the present application also provides a chip, including a processor and an interface. The interface is used to input and output data or instructions processed by the processor. The processor is used to execute the method provided in the above method embodiment. The chip can be used in terminal equipment or network equipment.

The invention also provides a computer-readable storage medium. The computer-readable storage medium may include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory) ), magnetic disks or optical disks and other media that can store program codes. Specifically, the computer-readable storage medium stores program information, and the program information is used in the above communication method.

Embodiments of the present application also provide a program, which, when executed by a processor, is used to perform the communication method provided by the above method embodiments.

Embodiments of the present application also provide a program product, such as a computer-readable storage medium. Instructions are stored in the program product. When the program product is run on a computer, it causes the computer to execute the communication method provided by the above method embodiment.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. A computer program product includes one or more computer instructions. When computer program instructions are loaded and executed on a computer, processes or functions according to embodiments of the invention are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. Computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, computer instructions may be transmitted from a website, computer, server, or data center via a wired ( For example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means to transmit to another website, computer, server or data center. Computer-readable storage media can be any available media that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more available media integrated. Available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), etc.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention. scope.

Claims (44)

A communication method, characterized by including: The terminal device sends the first message to the network device at the first moment; If search space set grouping switching is triggered, and the terminal device monitors the physical downlink control channel based on the first search space set grouping at the second time, then the terminal device switches from based on the first search space set grouping to based on the second search space set grouping. The search space set group monitors the physical downlink control channel. The method according to claim 1, characterized in that the monitoring opportunities of the physical downlink control channels corresponding to the second search space set group are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set group. The method of claim 1, wherein the first message includes a scheduling request. The method according to claim 3, characterized in that the first message is in a waiting state at the second moment. The method of claim 1, wherein the first message includes a random access request. The method according to claim 5, characterized in that the random access request includes message 1 of four-step random access or message A of two-step random access. The method according to any one of claims 1 to 6, characterized in that the first search space set grouping and the second search space set grouping are determined according to the configuration information of the network device. The method according to any one of claims 1 to 6, characterized in that the second time is determined based on the offset of the first time and a target time, or is determined based on a timer started at the first time. The method of claim 8, wherein the time offset is determined based on the round-trip delay between the terminal device and the network device, or based on the uplink timing advance of the terminal device, or, It is determined according to the configuration information sent by the network device, or is the preset information of the terminal device. The method according to claim 9, characterized in that the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels. A communication method, characterized by including: The network device receives a first message sent by the terminal device at a first moment. The first message triggers a search space set grouping switching. The search space set grouping switching is used to switch the terminal device from a grouping based on the first search space set to a grouping based on the first search space set. The second search space set monitors the physical downlink control channel in groups; The network device sends response information to the terminal device on the physical downlink control channel. The method according to claim 11, characterized in that the monitoring opportunities of the physical downlink control channels corresponding to the second search space set grouping are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set grouping. The method of claim 11, wherein the first message includes a scheduling request. The method of claim 11, wherein the first message includes a random access request. The method according to claim 14, characterized in that the random access request includes message 1 of four-step random access or message A of two-step random access. The method according to any one of claims 11 to 15, characterized in that the first search space set grouping and the second search space set grouping are determined according to the configuration information of the network device. The method according to claim 11, characterized in that the first message is in a waiting state at the second moment. The method of claim 17, wherein the second time is determined based on the first time and target time offset, or is determined based on a timer started at the first time. The method of claim 18, wherein the time offset is determined based on the round-trip delay between the terminal device and the network device, or based on the uplink timing advance of the terminal device, or, It is determined according to the configuration information sent by the network device, or is the preset information of the terminal device. The method according to claim 19, characterized in that the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels. A communication device, characterized by including: A sending module, configured to send the first message to the network device at the first moment; A processing module configured to switch from grouping based on the first search space set to grouping based on the first search space set if the switching of the search space set grouping is triggered and the communication device monitors the physical downlink control channel based on the first search space set grouping at the second moment. The two search space sets monitor the physical downlink control channel in groups. The apparatus according to claim 21, wherein the monitoring opportunities of the physical downlink control channels corresponding to the second search space set group are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set group. The apparatus of claim 21, wherein the first message includes a scheduling request. The device according to claim 23, characterized in that the first message is in a waiting state at the second moment. The apparatus of claim 21, wherein the first message includes a random access request. The apparatus according to claim 25, wherein the random access request includes message 1 of four-step random access or message A of two-step random access. The apparatus according to any one of claims 21 to 26, characterized in that the first search space set grouping and the second search space set grouping are determined according to the configuration information of the network device. The device according to any one of claims 21 to 26, characterized in that the second time is determined based on the offset of the first time and a target time, or is determined based on a timer started at the first time. . The device according to claim 28, wherein the time offset is determined based on the round-trip delay between the communication device and the network device, or based on the uplink timing advance of the communication device, or, It is determined according to the configuration information sent by the network device, or is the preset information of the communication device. The device according to claim 29, characterized in that the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels. A communication device, characterized by including: A receiving module, configured to receive the first message sent by the terminal device at the first moment, the first message triggering the search space set grouping, and the search space set grouping switching is used to switch the terminal device from grouping based on the first search space set Monitor the physical downlink control channel based on the second search space set group; A sending module, configured to send response information to the terminal device on the physical downlink control channel. The apparatus according to claim 31, characterized in that the monitoring opportunities of the physical downlink control channels corresponding to the second search space set group are denser than the monitoring opportunities of the physical downlink control channels corresponding to the first search space set group. The apparatus of claim 31, wherein the first message includes a scheduling request. The apparatus of claim 31, wherein the first message includes a random access request. The apparatus according to claim 34, wherein the random access request includes message 1 of four-step random access or message A of two-step random access. The device according to any one of claims 31 to 35, characterized in that the first search space set grouping and the second search space set grouping are determined according to the configuration information of the communication device. The device according to claim 31, characterized in that the first message is in a waiting state at the second moment. The device according to claim 37, wherein the second time is determined based on an offset between the first time and a target time, or is determined based on a timer started at the first time. The apparatus according to claim 38, wherein the time offset is determined based on the round-trip delay between the terminal equipment and the communication device, or based on the uplink timing advance of the terminal equipment, or, It is determined according to the configuration information sent by the communication device, or is the preset information of the terminal device. The device according to claim 39, characterized in that the configuration information is carried in broadcast or radio resource control signaling or medium access control resources or physical downlink control channels. A terminal device, characterized by including: Processors, memories, receivers, and interfaces for communicating with network devices; The memory stores computer execution instructions; The processor executes the computer execution instructions stored in the memory, so that the processor executes the communication method according to any one of claims 1 to 10. A network device, characterized by including: Processors, memories, transmitters, and interfaces for communication with end devices; The memory stores computer execution instructions; The processor executes the computer execution instructions stored in the memory, so that the processor executes the communication method according to any one of claims 11 to 20. A computer program product includes computer instructions, characterized in that when the computer instructions are executed by a processor, the communication method according to any one of claims 1-20 is implemented. A computer-readable storage medium, characterized in that computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, they are used to implement any one of claims 1 to 20. the communication method described above.