Physical Downlink Control Channel PDCCH Monitoring Method, Device, and Terminal

Abstract

Embodiments of the present application are applicable to the field of communication technologies, and provide a method, apparatus, and terminal for monitoring a physical downlink control channel (PDCCH). The method includes: The terminal receives search space information configured by a network device, where the search space information includes information on a first search space set and a second search space set; when the terminal monitors the PDCCH according to the second search space set, if it receives downlink control information (DCI) for data scheduling, it stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set. By using the above method, the search space set can be switched according to the type of information received by the terminal. When the monitoring periods of the search spaces in the second search space set are relatively large and the monitoring periods of the search spaces in the first search space set are relatively small, the terminal switches to the first search space set to monitor the PDCCH, which helps to quickly complete data transmission and reduce data transmission latency.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of communication technologies, and in particular, to a method, apparatus, and terminal for monitoring a physical downlink control channel (PDCCH). Background Art

[0002] A base station sends downlink control information (DCI) to a terminal through a physical downlink control channel (PDCCH). The DCI contains downlink data scheduling information, which is used to indicate to the terminal at what time-frequency resource position and with what configuration parameters to receive and demodulate data.

[0003] When receiving DCI, the terminal needs to perform blind detection (BD) among multiple PDCCH candidate positions (PDCCH candidates) in the downlink control region. A set of PDCCH candidate positions that the terminal needs to blindly detect forms a search space set group (SSSG). According to the configuration of the base station, the terminal may monitor one or more search space set groups to find out whether there is a PDCCH sent by the base station to itself.

[0004] In the prior art, for unlicensed spectrum, the terminal can switch the search space set when monitoring the PDCCH. For example, the base station configures two search space sets (search space set 0 and search space set 1) for the terminal, and the monitoring periods of search space set 0 and search space set 1 are different. When the base station does not seize the channel, the terminal monitors the PDCCH according to search space set 0; when the base station seizes the channel, the terminal monitors the PDCCH according to search space set 1. By monitoring the PDCCH with a more appropriate monitoring period under different conditions, the terminal can achieve purposes such as energy saving. However, for licensed spectrum, since the base station always occupies the channel, it is not suitable for the terminal to switch the search space set in the above manner. Summary of the Invention

[0005] Embodiments of the present application provide a method, apparatus, and terminal for monitoring a physical downlink control channel (PDCCH), which solve the problem in the prior art that for licensed spectrum, it is not suitable for the terminal to switch the search space set according to whether the base station seizes the channel.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] In a first aspect, a method for monitoring a physical downlink control channel (PDCCH) is provided. The method is applied to a terminal and includes: the terminal receives search space information configured by a network device, where the search space information includes information on a first search space group and a second search space group; when the terminal monitors the PDCCH according to the second search space group, if the terminal receives downlink control information (DCI) for data scheduling, the terminal stops monitoring the PDCCH according to the second search space group and starts monitoring the PDCCH according to the first search space group.

[0008] Based on the above technical solution, the terminal can switch the search space group according to the type of the received information. When the monitoring periods of the search spaces in the second search space group are relatively large and the monitoring periods of the search spaces in the first search space group are relatively small, the terminal switches to the first search space group to monitor the PDCCH, which helps to quickly complete data transmission and reduce data transmission delay. In addition, the terminal can select a search space group with a suitable monitoring period to monitor the PDCCH according to whether data needs to be scheduled. When there is no data transmission, the terminal can monitor the PDCCH according to the second search space group with a relatively large monitoring period, reducing the power consumption of the terminal and extending the standby time of the terminal.

[0009] In a possible implementation, the first search space group has first configuration parameters, and the second search space group has second configuration parameters; the parameters related to time-domain monitoring in the second configuration parameters are a subset of the parameters related to time-domain monitoring in the first configuration parameters; and / or, the parameters related to frequency-domain monitoring in the second configuration parameters are a subset of the parameters related to frequency-domain monitoring in the first configuration parameters.

[0010] By configuring the first configuration parameters of the first search space group and the second configuration parameters of the second search space group to have a nested relationship, it is possible to avoid the loss of scheduling when the terminal and the network device are not aligned. In this way, when the time slots on both sides of the network device and the terminal are not aligned due to certain error conditions, the scheduling information sent by the network device can also be received by the terminal.

[0011] In a second aspect, a method for monitoring a physical downlink control channel (PDCCH) is provided. The method is applied to a terminal and includes: the terminal receives search space information configured by a network device, where the search space information includes information on a first search space group and a second search space group; when the terminal monitors the PDCCH according to the second search space group, if the terminal sends a first signal to the network device, after sending the first signal, the terminal stops monitoring the PDCCH according to the second search space group and starts monitoring the PDCCH according to the first search space group, where the first signal includes at least one of the following signals or channels: random access preamble code, scheduling request (SR), hybrid automatic repeat request negative acknowledgment (NACK), and / or physical uplink shared channel (PUSCH).

[0012] Based on the above technical solution, the terminal can determine whether to switch the search space set according to the type of the first signal sent to the network device, so that when there is uplink data to be scheduled for the terminal, or when the terminal is in an abnormal state and requests to resume normal by initiating a random access procedure, the terminal can switch to the first search space set with a relatively small monitoring period, and monitor the PDCCH according to the first search space set, which can reduce the PDCCH monitoring, reduce the power consumption of the terminal, and reduce the signaling overhead.

[0013] In a third aspect, a communication device is provided. The communication device may be a terminal, a chip or a system-on-chip in the terminal. The communication device includes: a processor and a memory. The memory stores instructions. When the instructions are executed by the processor, the communication device is caused to perform the following steps: receiving search space information configured by a network device, where the search space information includes information on a first search space set and a second search space set; when monitoring the PDCCH according to the second search space set, if receiving downlink control information DCI for data scheduling, stopping monitoring the PDCCH according to the second search space set and starting to monitor the PDCCH according to the first search space set.

[0014] In a fourth aspect, a communication device is provided. The communication device may be a terminal, a chip or a system-on-chip in the terminal. The communication device includes: a processor and a memory. The memory stores instructions. When the instructions are executed by the processor, the communication device is caused to perform the following steps: receiving search space information configured by a network device, where the search space information includes information on a first search space set and a second search space set; when monitoring the PDCCH according to the second search space set, if sending a first signal to the network device, after sending the first signal, stopping monitoring the PDCCH according to the second search space set and starting to monitor the PDCCH according to the first search space set, where the first signal includes at least one of the following signals or channels: random access preamble code, scheduling request SR, hybrid automatic repeat request negative acknowledgment NACK, and / or physical uplink shared channel PUSCH.

[0015] In a fifth aspect, a communication device is provided. The communication device includes: a communication module and a processing module. The communication module is configured to receive search space information configured by a network device, where the search space information includes information on a first search space set and a second search space set. The processing module is configured to, when monitoring the PDCCH according to the second search space set, if receiving downlink control information DCI for data scheduling, stop monitoring the PDCCH according to the second search space set and start to monitor the PDCCH according to the first search space set.

[0016] In a sixth aspect, a communication device is provided, which includes a communication module and a processing module. The communication module is configured to receive search space information configured by a network device, where the search space information includes information of a first search space set and a second search space set. The processing module is configured to, when monitoring a PDCCH according to the second search space set, if a first signal is sent to the network device, after sending the first signal, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set, where the first signal includes at least one of the following signals or channels: a random access preamble code, a scheduling request (SR), a negative acknowledgment (NACK) of a hybrid automatic repeat request, and / or a physical uplink shared channel (PUSCH).

[0017] In a seventh aspect, a computer-readable storage medium is provided, in which instructions are stored. When the instructions are run on a terminal, the terminal can be caused to execute the method involved in any one of the designs in the first aspect to the second aspect above.

[0018] In an eighth aspect, a computer program product including instructions is provided. When the computer program product is run on a terminal, the terminal can be caused to execute the method involved in any one of the designs in the first aspect to the second aspect above.

[0019] In a ninth aspect, a chip is provided, which includes a processor. When the processor executes instructions, the processor is configured to execute the method involved in any one of the designs in the first aspect to the second aspect above. The instructions can come from a memory inside the chip or a memory outside the chip. Optionally, the chip further includes an input / output circuit.

[0020] In a tenth aspect, a communication system is provided, which includes a network device and a terminal. The terminal is configured to execute the PDCCH monitoring method involved in any one of the designs in the first aspect or the second aspect above.

[0021] The PDCCH monitoring method, device, and terminal provided in the embodiments of this application have the following advantages:

[0022] The terminal receives information on one or more search space sets configured by the base station. Since the monitoring periods of the search spaces in each search space set may be different, when the terminal monitors the PDCCH according to the second search space set, if the terminal receives DCI for data scheduling, the terminal can switch the search space set and start monitoring the PDCCH according to the first search space set. When the monitoring periods of the search spaces in the second search space set are relatively large and the monitoring periods of the search spaces in the first search space set are relatively small, the terminal switches to the first search space set with a relatively small monitoring period to monitor the PDCCH, which helps to quickly complete data transmission and reduce data transmission delay. The terminal can select a search space set with an appropriate monitoring period to monitor the PDCCH based on whether data needs to be scheduled. When there is no data transmission, the terminal can monitor the PDCCH according to the second search space set with a relatively large monitoring period, reducing the power consumption of the terminal and extending the standby time of the terminal. Description of the Drawings

[0023] Figure 1 FIG. is a schematic diagram of a scenario of a PDCCH monitoring method provided by an embodiment of the present application;

[0024] Figure 2 FIG. is a schematic diagram of a data transmission process provided by an embodiment of the present application;

[0025] Figure 3 FIG. is a schematic structural diagram of a terminal provided by an embodiment of the present application;

[0026] Figure 4 FIG. is a schematic flowchart of steps of a PDCCH monitoring method provided by an embodiment of the present application;

[0027] FIG. 5(a) is a schematic diagram of the interface of a terminal during video buffering provided by an embodiment of the present application;

[0028] FIG. 5(b) is a schematic diagram of the interface of a terminal during video playback provided by an embodiment of the present application;

[0029] Figure 6 FIG. is a schematic flowchart of steps of another PDCCH monitoring method provided by an embodiment of the present application;

[0030] Figure 7 FIG. is a schematic diagram of the time relationship of a terminal switching search space sets provided by an embodiment of the present application;

[0031] Figure 8 FIG. is a schematic diagram of a non-competitive random access procedure provided by an embodiment of the present application;

[0032] Figure 9 FIG. is a schematic diagram of a contention resolution-based random access procedure provided by an embodiment of the present application;

[0033] Figure 10 Schematic diagram of the startup process of a random access contention resolution timer provided by an embodiment of the present application;

[0034] Figure 11 Schematic diagram of the startup process of a discontinuous reception downlink retransmission timer provided by an embodiment of the present application;

[0035] Figure 12 Schematic diagram of another startup process of a discontinuous reception downlink retransmission timer provided by an embodiment of the present application;

[0036] Figure 13 Schematic diagram of the startup or restart process of a first search space set timer provided by an embodiment of the present application;

[0037] Figure 14 Schematic diagram of another startup or restart process of a first search space set timer provided by an embodiment of the present application;

[0038] Figure 15 Schematic diagram of the structure of a communication device provided by an embodiment of the present application;

[0039] Figure 16 Schematic diagram of the structure of a chip provided by an embodiment of the present application. Detailed implementation manners

[0040] In order to facilitate a clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and effects. For example, the first search space set and the second search space set are only used to distinguish different search space sets, and do not limit their quantities and execution orders.

[0041] It should be noted that in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific manner.

[0042] The network architectures and service scenarios described in the embodiments of the present application are for a clearer illustration of the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. Those of ordinary skill in the art will know that with the evolution of network architectures and the emergence of new service scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0043] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that there can be three relationships. For example, A and / or B can represent the cases of A existing alone, A and B existing simultaneously, and B existing alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c can be single or multiple.

[0044] In the embodiments of the present application, "configured" means configured by radio resource control (RRC) signaling, or configured by a MAC control element (MAC CE), or configured by DCI, or configured by other signaling; correspondingly, "indicated" in the embodiments of the present application can be indicated by RRC signaling, or indicated by MAC CE, or indicated by DCI, or indicated by other signaling.

[0045] The steps involved in a PDCCH monitoring method provided in the embodiments of the present application are merely examples, and not all steps are necessarily to be executed, or not all the contents in each information or message are mandatory. During use, they can be increased or decreased as needed.

[0046] In the embodiments of the present application, the same step or steps with the same function or messages can be referred to and learned from each other among different embodiments.

[0047] As Figure 1 shown, it is a schematic diagram of the scenario of a PDCCH monitoring method provided by the embodiments of the present application. In Figure 1In the scenario, there are a network device 101 and a terminal 102. Generally, the data transmission between the network device and the terminal is carried out according to the following process: The network device sends DCI to the terminal. The DCI contains downlink data scheduling information. The network device tells the terminal at what time-frequency resource location and with what configuration parameters (such as modulation and coding scheme (MCS), redundancy version (RV), etc.) to receive and demodulate the downlink data through the downlink data scheduling information. Then, the network device sends the corresponding downlink data at the time-frequency resource location indicated in the DCI with the configuration parameters indicated in the DCI, and the terminal receives it at the corresponding location with the corresponding parameters. Alternatively, the DCI contains uplink data scheduling information. The terminal sends the corresponding uplink data at the time-frequency resource location indicated in the DCI with the configuration parameters indicated in the DCI, and the network device receives it at the corresponding location with the corresponding parameters.

[0048] The above process can be referred to Figure 2 as shown. Among them, the PDCCH carries the DCI, the physical downlink shared channel (PDSCH) carries the downlink data, and the physical uplink shared channel (PUSCH) carries the uplink data.

[0049] In the embodiments of the present application, Figure 1The network device 101 shown in the figure may be a base station for wireless communication, a base station controller, or the like. For example, the base station may include various types of base stations, such as: micro base stations (also known as small stations), macro base stations, relay stations, access points, etc. The embodiments of the present application do not make specific limitations thereto. In the embodiments of the present application, the base station may be a base transceiver station (BTS) in a global system for mobile communication (GSM), a codedivision multiple access (CDMA), a node B in a wideband code division multiple access (WCDMA), an evolutional node B (eNB or e-NodeB) in a long term evolution (LTE), an eNB in an internet of things (IoT) or a narrow band-internet of things (NB-IoT), a base station in a future 5G mobile communication network or a future evolved public land mobile network (PLMN). The embodiments of the present application do not make any limitations thereto. In the embodiments of the present application, the device for implementing the functions of the network device may be the network device or a device capable of supporting the network device to implement the functions, such as a chip system. In the embodiments of the present application, the technical solutions provided by the embodiments of the present application are described by taking the device for implementing the functions of the network device as the network device as an example.

[0050] The network device described in the embodiments of this application, such as a base station, generally includes a baseband unit (BBU), a remote radio unit (RRU), an antenna, and a feeder for connecting the RRU and the antenna. Among them, the BBU is responsible for signal modulation. The RRU is responsible for radio frequency processing. The antenna is responsible for the conversion between the guided wave on the cable and the space wave in the air. On the one hand, the distributed base station greatly shortens the length of the feeder between the RRU and the antenna, which can reduce signal loss and also reduce the cost of the feeder. On the other hand, the RRU plus the antenna is relatively small and can be installed anywhere, making network planning more flexible. In addition to pulling the RRU away, all the BBUs can also be centralized and placed in the central office (CO). Through this centralized method, the number of base station computer rooms can be greatly reduced, the supporting equipment can be reduced, especially the energy consumption of air conditioners, and a large amount of carbon emissions can be reduced. In addition, after the scattered BBUs are centralized into a BBU baseband pool, they can be uniformly managed and scheduled, and resource allocation is more flexible. In this mode, all physical base stations evolve into virtual base stations. All virtual base stations share information such as user data transceiver and channel quality in the BBU baseband pool and cooperate with each other to enable joint scheduling to be realized.

[0051] In some deployments, the base station may include a centralized unit (CU) and a distributed unit (DU). The base station may also include an active antenna unit (AAU). The CU implements some functions of the base station, and the DU implements some functions of the base station. For example, the CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and the functions of the packet data convergence protocol (PDCP) layer. The DU is responsible for processing physical layer protocols and real-time services, implementing radio link control (RLC), media access control (MAC), and physical (PHY) layer functions. The AAU implements some physical layer processing functions, radio frequency processing, and related functions of active antennas. Since the information in the RRC layer will ultimately become the information in the PHY layer, or is transformed from the information in the PHY layer, therefore, in this architecture, high-layer signaling, such as RRC layer signaling or PDCP layer signaling, can also be considered to be sent by the DU, or sent by the DU + AAU. It can be understood that the network device may be a device including one or more of the CU node, DU node, and AAU node. In addition, the CU may be classified as a network device in the radio access network (RAN), or the CU may be classified as a network device in the core network (CN), which is not restricted here.

[0052] Figure 1The terminal 102 shown in [Figure] is a device with wireless transceiver capabilities. The terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on water (such as on a ship); or it can be deployed in the air (such as on an airplane, balloon, satellite, etc.). The terminal device can be a user equipment (UE). Among them, the UE includes handheld devices, vehicles, vehicle-mounted devices, wearable devices, or computing devices with wireless communication capabilities. Exemplarily, the UE can be a mobile phone, a tablet computer, or a computer with wireless transceiver capabilities. The terminal device can also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in remote medical treatment, a wireless terminal in a smart grid, a wireless terminal in a smart city, a wireless terminal in a smart home, and so on. In the embodiments of the present application, the device for implementing the functions of the terminal can be the terminal itself or a device capable of supporting the terminal to implement such functions, such as a chip system. In the embodiments of the present application, the chip system can be composed of chips or can include chips and other discrete devices. In the embodiments of the present application, taking the device for implementing the functions of the terminal as the terminal as an example, the technical solutions provided in the embodiments of the present application are described.

[0053] Exemplarily, Figure 3 shows a schematic structural diagram of a terminal. As Figure 3 shown, the terminal includes: at least one processor 301, a communication line 302, a memory 303, and at least one communication interface 304.

[0054] The processor 301 can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the programs of the present application solution.

[0055] The communication line 302 can include a path for transmitting information between the above components.

[0056] The communication interface 304 uses any device such as a transceiver for communicating with other devices or communication networks, such as Ethernet, RAN, wireless local area networks (WLAN), etc.

[0057] The memory 303 can be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory can exist independently and be connected to the processor through the communication line 302. The memory can also be integrated with the processor. The memory provided in the embodiments of the present application generally has non-volatility. Among them, the memory 303 is used to store computer execution instructions for executing the solutions of the present application and is controlled by the processor 301 to execute. The processor 301 is used to execute the computer execution instructions stored in the memory 303, so as to implement the method provided in the following embodiments of the present application.

[0058] Optionally, the computer execution instructions in the embodiments of the present application can also be referred to as application program code, and the embodiments of the present application do not make specific limitations thereon.

[0059] In a specific implementation, as an embodiment, the processor 301 can include one or more CPUs, such as Figure 3 CPU0 and CPU1 in

[0060] In a specific implementation, as an embodiment, the terminal can include multiple processors, such as Figure 3 the processor 301 and the processor 307 in

[0061] In a specific implementation, as an example, the terminal may further include an output device 305 and an input device 306. The output device 305 communicates with the processor 301 and can display information in various ways. For example, the output device 305 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc. The input device 306 communicates with the processor 301 and can receive user input in various ways. For example, the input device 306 may be a mouse, a keyboard, a touch screen device, or a sensing device, etc.

[0062] The following specifically introduces the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings of the specification.

[0063] As Figure 4 shown, it is a schematic flowchart of the steps of a PDCCH monitoring method provided by an embodiment of the present application. This method can be applied to Figure 1 the terminal 102 shown. The terminal 102 may be a terminal with the Figure 3 structure shown. For ease of understanding, the following uses the terminal 102 as a mobile phone to introduce the PDCCH monitoring method provided by the embodiments of the present application. This method may include the following steps:

[0064] S401. The terminal receives the search space information configured by the network device, and the search space information includes the information of the first search space group and the second search space group.

[0065] In the embodiments of the present application, the network device may be Figure 1 the base station 101 shown.

[0066] In the embodiments of the present application, the base station configures one or more search space set groups (SSSGs) for the terminal. The terminal needs to monitor one or more search space groups to find out whether there is a PDCCH sent by the base station to itself.

[0067] Generally, each PDCCH consists of one or more control channel elements (CCEs). The number of CCEs contained in a PDCCH is called the aggregation level (AL). When a PDCCH consists of 1 CCE, the aggregation level of this PDCCH is 1; when a PDCCH consists of 2 CCEs, the aggregation level of this PDCCH is 2, and so on. The possible aggregation levels can include multiple types, such as 1, 2, 4, 8, and 16, a total of 5 types. When the terminal blindly detects the PDCCH within a certain time-frequency range, this time-frequency range can be called a search space. The search space usually appears periodically in time. Further, a search space set can include one or more search spaces, that is, it can be understood that an overall composed of one or more search spaces is called a search space set.

[0068] When the base station configures one or more search space sets, the relevant configuration information element (IE) can include:

[0069] searchSpacesToAddModList: Add search space configurations to the list, and this list enumerates one or more search spaces configured by the base station for the terminal.

[0070] searchSpacesToReleaseList: Delete search spaces from the list.

[0071] It should be noted that in different documents, the names for the search space may be different. For example, in some other documents, the search space may also be called the search space set.

[0072] In the embodiments of this application, the configuration items of each search space can include the monitoring period and offset value when monitoring this search space, the symbols to be monitored within one time slot, the number of blind detections required for each aggregation level, and so on. The relevant configuration IEs are as follows:

[0073] controlResourceSetId: Represents the index value of the control resource set (CORESET) associated with this search space. According to the configuration of the associated CORESET, the frequency-domain resources occupied by this search space, the symbol length duration to be monitored, the mapping method from control channel element (CCE) to resource element group (REG), the precoding granularity, the Transmission Configuration Indicator (TCI) status configuration, etc. can be determined.

[0074] monitoringSlotPeriodicityAndOffset: Represents the monitoring period and offset value of the time slots to be monitored for this search space. Among them, slx is used to represent the size of the period. For example, sl1 represents a monitoring period of 1 time slot, indicating that the terminal monitors the PDCCH once every 1 time slot; sl8 represents a monitoring period of 8 time slots, indicating that the terminal can monitor the PDCCH once every 8 time slots. After selecting a period value, the monitoring offset value also needs to be indicated. For example, after the network device configures sl8 (i.e., the monitoring period is 8 time slots), it also needs to configure in which time slot of a period to start monitoring this search space, and the optional values are 0 to 7, corresponding to each time slot in a period respectively.

[0075] duration: Represents the time-domain length that this search space lasts each time it appears, with the unit of time slot, that is, the number of time slots to be monitored within a period.

[0076] monitoringSymbolsWithinSlot: Represents the starting symbol to be monitored within the time slots to be monitored for this search space. Its value is a 14-bit sequence, respectively indicating whether the 14 symbols within a time slot are the starting symbols to be monitored. For example, if its value is 10000001000000, then the starting symbols to be monitored within a time slot are symbol 0 and symbol 7. If the duration value of the CORESET associated with this search space is 3 at this time, all the symbols to be monitored are symbol 0, symbol 1, symbol 2, symbol 7, symbol 8, and symbol 9.

[0077] nrofCandidates: Represents the number of PDCCH candidates to be blindly detected for each aggregation level within this search space.

[0078] aggregationLevelx: represents the number of blind detections required for PDCCH candidates with aggregation level x. For example, when aggregationLevel1 takes the value of n6, it means that PDCCH candidates with aggregation level 1 require 6 blind detections.

[0079] searchSpaceType: represents the type of this search space. When searchSpaceType takes the value of common, it means that this search space is a common search space. At this time, the parameters that can be configured for selection are as follows:

[0080] dci-Format0-0-AndFormat1-0, dci-Format2-0, dci-Format2-1, dci-Format2-2, dci-Format2-3.

[0081] When any one of the above parameters is configured, it indicates that the terminal needs to monitor the DCI of the corresponding format within this search space. For example, if dci-Format0-0-AndFormat1-0 is configured, it means that the terminal needs to monitor DCI format 0_0 and DCI format 1_0 within this search space; when dci-Format0-0-AndFormat1-0 is not configured, it means that the terminal does not need to monitor DCI format 0_0 and DCI format 1_0 within this search space. When searchSpaceType takes the value of UE-specific, it means that this search space is a user equipment specific search space. At this time, the parameters that can be configured for selection are: formats0-0-And-1-0 or formats0-1-And-1-1. When any one of the above parameters is configured, it indicates that the terminal needs to monitor the DCI of the corresponding format within this search space.

[0082] In a possible implementation manner of the embodiment of the present application, the search space group configured by the base station for the terminal may include a first search space group and a second search space group. The terminal can obtain the configuration information of the first search space group and the second search space group by receiving the DCI sent by the base station. Among them, the monitoring period of the search space included in the first search space group is less than or equal to the monitoring period of the search space included in the second search space group.

[0083] S402. When the terminal monitors the PDCCH according to the second search space group, if the terminal receives the downlink control information DCI for data scheduling, the terminal stops monitoring the PDCCH according to the second search space group and starts monitoring the PDCCH according to the first search space group.

[0084] In an embodiment of the present application, the terminal can switch the monitored search space set according to the specific requirements of data scheduling.

[0085] In an embodiment of the present application, each search space set includes a plurality of search spaces, and the monitoring period of each search space is independently configured. The base station can configure the monitoring periods of the respective search spaces in each search space set to be the same size or to be different sizes.

[0086] In a possible implementation manner of an embodiment of the present application, the monitoring period of each search space included in the first search space set is less than the monitoring period of each search space included in the second search space set.

[0087] Exemplarily, the first search space set includes a first search space and a second search space, and the second search space set includes a third search space and a fourth search space. Among them, the monitoring periods of the first search space and the second search space can be 3 time slots and 4 time slots respectively. Correspondingly, the monitoring periods of the third search space and the fourth search space can be 6 time slots and 8 time slots respectively. In this case, the monitoring period of each search space in the first search space set is less than the monitoring period of each search space in the second search space set.

[0088] In another possible implementation manner of an embodiment of the present application, among the plurality of search spaces included in the first search space set, the monitoring periods of some search spaces are less than the monitoring period of each search space in the second search space set.

[0089] Exemplarily, the monitoring periods of the first search space and the second search space can be 3 time slots and 10 time slots respectively. Correspondingly, the monitoring periods of the third search space and the fourth search space can be 6 time slots and 8 time slots respectively. In this case, the monitoring periods of some search spaces in the first search space set are less than the monitoring periods of the search spaces in the second search space set.

[0090] The monitoring periods of the respective search spaces in the first search space set and the monitoring periods of the respective search spaces in the second search space set can be configured to be any size, and the embodiments of the present application do not limit the size of the monitoring periods of the respective search spaces.

[0091] Therefore, when the terminal monitors the PDCCH according to the second search space set with a relatively large monitoring period, if the terminal receives the DCI for data scheduling, it indicates that there may be data to be transmitted between the base station and the terminal currently. If the terminal continues to monitor the PDCCH according to the second search space set with a relatively large monitoring period, it may extend the data transmission time, resulting in an excessive data transmission delay. At this time, the terminal can stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set with a relatively small monitoring period, which helps to complete the data transmission quickly and reduce the data transmission delay.

[0092] In an embodiment of the present application, the DCI for data scheduling may belong to the DCI scrambled by any of the following radio network temporary identities (RNTIs):

[0093] Cell Radio Network Temporary Identity C-RNTI, Modulation and Coding Scheme Radio Network Temporary Identity MCS-C-RNTI, or Configured Scheduling Radio Network Temporary Identity CS-RNTI.

[0094] In another possible implementation manner of the embodiment of the present application, when the terminal monitors the PDCCH according to the second search space set and receives the DCI for data scheduling, when the terminal starts to monitor the PDCCH according to the first search space set, it may not stop monitoring the PDCCH according to the second search space set, but monitor the PDCCH according to the first search space set and the second search space set simultaneously.

[0095] In a possible implementation manner of the embodiment of the present application, when the terminal monitors the PDCCH according to the first search space set and receives the DCI for data scheduling, the terminal can continue to monitor the PDCCH according to the first search space set without the need to switch the search space set.

[0096] In a possible implementation manner of the embodiment of the present application, the terminal may be configured with a timer, and the timer is used to limit the time of using different search space sets. For example, when the timer is started, the terminal switches from the second search space set to the first search space set. After the timer times out, the terminal can switch back from the first search space set to the second search space set.

[0097] In an embodiment of the present application, the terminal receives information on one or more search space sets configured by the base station. Since the monitoring periods of the search spaces included in different search space sets may be different, when the terminal monitors the PDCCH according to the second search space set, if the terminal receives a DCI for data scheduling, the terminal may start monitoring the PDCCH according to the first search space set. When the monitoring periods of the respective search spaces in the first search space set are relatively small, for example, the monitoring periods of all or part of the search spaces in the first search space set are less than the monitoring periods of the respective search spaces in the second search space set, when the terminal receives a DCI for data scheduling, by switching from the second search space set with a relatively large monitoring period to the first search space set with a relatively small monitoring period, it helps to quickly complete data transmission and reduce data transmission delay; the terminal can select a search space set with a suitable monitoring period to monitor the PDCCH according to whether data needs to be scheduled, and when there is no data transmission, it can monitor the PDCCH according to the second search space set with a relatively large monitoring period, reducing the power consumption of the terminal and extending the standby time of the terminal.

[0098] In an embodiment of the present application, when data arrives, the terminal can switch the search space set. For example, switch from the second search space set to the first search space set. If the monitoring periods of the respective search spaces in the second search space set are relatively large, then after the terminal switches to the first search space set with a relatively small monitoring period, it can quickly schedule the data.

[0099] In an embodiment of the present application, one of the identifiers of data arrival is that the terminal receives a preset DCI (scheduling DCI, that is, the DCI for scheduling data), and the scheduling DCI includes a DCI scrambled with a C-RNTI, MCS-C-RNTI, or CS-RNTI.

[0100] Generally, the terminal can monitor the DCI scrambled with the above C-RNTI, MCS-C-RNTI, or CS-RNTI in the UESS. Therefore, in a possible implementation manner of an embodiment of the present application, the DCI for data scheduling may be a DCI scrambled with a C-RNTI, MCS-C-RNTI, or CS-RNTI within the UESS.

[0101] Since the common search space CSS does not belong to any search space set, the terminal needs to always monitor the PDCCH in the CSS.

[0102] Therefore, in another possible implementation manner of an embodiment of the present application, the first search space set and the second search space set are only for the user equipment specific search space UESS, and the common search space CSS does not belong to any search space set, and the terminal needs to always monitor the PDCCH in the CSS.

[0103] In the embodiments of the present application, the common search space CSS can be classified into the following categories:

[0104] (1) Type 0 CSS, which is used to transmit the DCI for scheduling SIB1, configured by MIB or by PDCCH-ConfigCommon, where the monitored DCI is scrambled with SI-RNTI;

[0105] (2) Type 0A CSS, which is used to transmit the DCI for scheduling OSI (i.e., other SIBs except SIB1, such as SIB2 / SIB3, etc.), configured by PDCCH-ConfigCommon, where the monitored DCI is scrambled with SI-RNTI;

[0106] (3) Type 1 CSS, which is used to transmit the DCI related to the random access procedure, configured by PDCCH-ConfigCommon, where the monitored DCI is scrambled with RA-RNTI, MsgB-RNTI or TC-RNTI;

[0107] (4) Type 2 CSS, which is used to transmit the DCI for paging, configured by PDCCH-ConfigCommon, where the monitored DCI is scrambled with P-RNTI;

[0108] (5) Type 3 CSS, which is used to transmit the DCI of other types except the above types, configured by PDCCH-Config, where the monitored DCI can be scrambled with any of the following RNTIs: INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, CI-RNTI, PS-RNTI, C-RNTI, MCS-C-RNTI or CS-RNTI(s).

[0109] Therefore, in another possible implementation manner of the embodiments of the present application, the DCI for data scheduling can also be the DCI scrambled with C-RNTI, MCS-C-RNTI or CS-RNTI within the third type of common search space CSS type 3. At this time, the first search space group and the second search space group are only for the user equipment specific search space UESS and Type 3 CSS, while other types of CSS do not belong to any search space group, and the terminal needs to always monitor the PDCCH in other types of CSS (such as Type 0 CSS, Type 0A CSS, Type 1 CSS and Type 2 CSS).

[0110] In the embodiment of the present application, the terminal can determine whether there is any downlink service arriving currently by judging whether the received DCI belongs to the DCI for data scheduling. If there is a downlink service arriving, the terminal can switch the search space set and start monitoring the PDCCH according to the first search space set. If the monitoring period of all or part of the search spaces in the first search space set is smaller than the monitoring period of each search space in the second search space set before the switch, when the terminal monitors the PDCCH according to the first search space set with a relatively smaller monitoring period, it can schedule the downlink data quickly and reduce the user waiting time.

[0111] Alternatively, in another possible implementation manner of the embodiment of the present application, the first search space set and the second search space set include any type of search space. For example, the first search space set and the second search space set may include UESS and CSS. At this time, when the terminal monitors the PDCCH according to the first search space set, even the common control information can be detected with a relatively larger period, which can further reduce the power consumption.

[0112] As an example of the embodiment of the present application, in Figure 1 the shown scenario, the user can use the Figure 1 terminal therein to watch videos. Generally, before the video is played, in order to ensure the smoothness of the video playback, the terminal needs to buffer a period of data in advance. As shown in Fig. 5(a), it is a schematic diagram of the terminal interface during video buffering. During buffering, since a large amount of data needs to be transmitted, it is better for the terminal to use the first search space set with a relatively smaller monitoring period to monitor the PDCCH at this time, so as to complete the data transmission quickly and reduce the waiting time for data buffering. When the video buffering is completed, for example, during the video playback shown in Fig. 5(b), there is no data transmission temporarily. At this time, it is better for the terminal to use the second search space set with a relatively larger monitoring period to monitor the PDCCH, so as to avoid power consumption waste. When the terminal changes from the "data not buffered" state to the "start data buffering" state, that is, when the terminal needs to switch from the second search space set with a relatively larger monitoring period to the first search space set with a relatively smaller monitoring period, it can implement the switch of the search space set by judging whether the terminal receives the DCI for data scheduling according to the method provided in the embodiment of the present application.

[0113] As Figure 6 shown, it is a schematic diagram of the step flow of another PDCCH monitoring method provided by the embodiment of the present application. This method can be applied to the Figure 1 shown terminal 102, and the terminal 102 can be a terminal with the Figure 3 shown structure. This method may include the following steps:

[0114] S601. The terminal receives the search space information configured by the network device, where the search space information includes the information of a first search space set and a second search space set.

[0115] Since S601 is similar to S401 in the foregoing embodiment, they can be referred to each other and will not be elaborated here.

[0116] S602. When the terminal monitors the PDCCH according to the second search space set, if the terminal sends a first signal to the network device, after sending the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts to monitor the PDCCH according to the first search space set. The first signal includes at least one of the following signals or channels: random access preamble code, scheduling request (SR), hybrid automatic repeat request negative acknowledgment (NACK), and / or physical uplink shared channel (PUSCH).

[0117] In the embodiment of the present application, the network device may be a base station; the first signal may be a signal sent by the terminal to the base station. It should be noted that the first signal is only a generic term for a specific type of signal for the convenience of description, and the first signal may include one or more signals that meet the corresponding conditions. When the terminal sends the first signal, it can switch the search space set for monitoring the PDCCH.

[0118] In a possible implementation manner of the embodiment of the present application, the first signal may be a random access preamble code.

[0119] Generally, when the terminal is in an abnormal state, such as a radio link failure, a beam failure, or an uplink out-of-sync state, the terminal will initiate a random access process to restore the terminal to a normal state. At this time, in order to restore to normal as quickly as possible, the terminal can switch the search space set for monitoring the PDCCH.

[0120] Since when the terminal performs the operation of restoring to normal, it first needs to send a preamble code or a physical random access channel (PRACH) code to the base station. Therefore, whether the terminal sends a preamble code or a PRACH code to the base station can be used as a judgment condition. After the terminal sends a preamble code or a PRACH code to the base station, the terminal can stop monitoring the PDCCH according to the second search space set and start to monitor the PDCCH according to the first search space set.

[0121] Of course, after the terminal starts monitoring the PDCCH according to the first search space set, it may not stop monitoring the PDCCH according to the second search space set, but instead monitor the PDCCH according to both the first search space set and the second search space set simultaneously.

[0122] Alternatively, if the terminal is monitoring the PDCCH according to the first search space set when sending a preamble code or a PRACH code to the base station, then after the terminal sends the preamble code or the PRACH code to the base station, the terminal may also continue to monitor the PDCCH according to the first search space set.

[0123] In a possible implementation manner of the embodiments of the present application, the monitoring period of each search space in the first search space set may be relatively smaller than the monitoring period of each search space in the second search space set. For example, the monitoring period of all or part of the search spaces in the first search space set is less than the monitoring period of each search space in the second search space set. Therefore, after the terminal switches from the second search space set with a relatively larger monitoring period to the first search space set with a relatively smaller monitoring period and starts monitoring the PDCCH according to the first search space set, it helps the terminal quickly return to the normal state.

[0124] In a possible implementation manner of the embodiments of the present application, the monitoring period of each search space in the first search space set may be relatively larger than the monitoring period of each search space in the second search space set. In another possible implementation manner, the monitoring period of each search space in the first search space set may be the same as the monitoring period of each search space in the second search space set. The embodiments of the present application do not limit the specific periods of the monitoring periods of each search space in the first search space set and the monitoring periods of each search space in the second search space set. It can be understood that these periods can be configured by the base station. In a possible implementation manner of the embodiments of the present application, the specific time when the terminal starts monitoring the PDCCH according to the first search space set after sending a preamble code or a PRACH code to the base station may refer to a preset number of time slots after the terminal sends the preamble code or the PRACH code. The above-mentioned preset number of time slots can be pre-configured according to actual needs, and the embodiments of the present application do not limit the specific number of the preset number of time slots.

[0125] Exemplarily, the above-mentioned preset number may be one. That is, in the next time slot after sending the preamble code or the PRACH code, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set.

[0126] As Figure 7 shown, it is a schematic diagram of the time relationship for a terminal to switch search space sets provided by the embodiments of the present application. InFigure 7 Among them, the abscissa t represents the chronological relationship between each time slot, where the next time slot of time slot T is time slot T + 1. If the terminal sends a preamble code to the base station in time slot T, the terminal can start monitoring the PDCCH according to the first search space set in time slot T + 1.

[0127] In another possible implementation manner of the embodiment of the present application, the specific time when the terminal starts monitoring the PDCCH according to the first search space set after sending the preamble code or the PRACH code to the base station may also refer to that the terminal receives the DCI scrambled with the random access radio network temporary identity RA-RNTI, and the DCI is used for non-competitive access.

[0128] Generally, after the terminal sends the preamble code or the PRACH code to the base station, the terminal will receive the random access response (RAR) sent by the base station. The RAR is scheduled by the DCI scrambled with the RA-RNTI. Therefore, in the case of non-competitive access, after the terminal receives the DCI scrambled with the RA-RNTI, it means that the terminal has successfully accessed. After that, the terminal usually starts data scheduling. Therefore, when the terminal receives the DCI scrambled with the RA-RNTI, if the DCI scrambled with the RA-RNTI is used for non-competitive access, the terminal can stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set. In a possible implementation manner of the embodiment of the present application, when the terminal starts monitoring the PDCCH according to the first search space set, it may also not stop monitoring the PDCCH according to the second search space set. That is, the terminal can monitor the PDCCH using the first search space set and the second search space set at the same time.

[0129] In the embodiment of the present application, when the terminal is in an abnormal state, the terminal can initiate a random access process to enable the terminal to return to normal as soon as possible. At this time, by determining whether the terminal sends a preamble code or a PRACH code, in the next time slot after sending the preamble code or the PRACH code, the terminal starts monitoring the PDCCH according to the first search space set with a relatively small monitoring period, which helps the terminal to return to normal quickly.

[0130] Considering that the search space for transmitting DCI scrambled with RA-RNTI is a common search space, when the terminal receives the DCI scrambled with RA-RNTI sent by the base station, it may not indicate the successful access of the random access channel (RACH) procedure. For example, since the PDSCH scheduled by RA-RNTI may carry the RARs of multiple terminals, the PDSCH scheduled by the PDCCH received by the current terminal may not contain the RAR of this terminal. At this time, for the terminal, the RAR is actually received unsuccessfully, and the RACH is not successful either.

[0131] Therefore, in a possible implementation manner of the embodiment of the present application, for the contention-free based RACH procedure initiated in the RRC connected state, the terminal can start to perform the switching of the search space group after receiving the RAR (carried by the PDSCH scheduled by the DCI scrambled with RA-RNTI). Considering the parsing time of the RAR, the terminal can start to perform the switching of the search space group after a preset number of time units after receiving the RAR. For example, if the terminal is currently listening to the PDCCH according to the second search space group, after a preset number of time units after the terminal sends the preamble code to the base station and receives the RAR sent by the base station, the terminal switches the search space group and starts to listen to the PDCCH according to the first search space group. Among them, the monitoring period of some or all of the search spaces in the second search space group is greater than the monitoring period of some or all of the search spaces in the first search space group. The specific number of the above time units can be preset according to actual needs, and the embodiment of the present application does not limit the number of time units. The above time units may include orthogonal frequency division multiplexing (OFDM) symbols, time slots, milliseconds, etc.

[0132] In another possible implementation manner of the embodiment of the present application, starting to perform the switching of the search space group after a preset number of time units after receiving the RAR may mean that in the first time slot after a preset number of time units after receiving the RAR, the terminal starts to monitor the PDCCH according to the first search space group.

[0133] As Figure 8 shown, it is a schematic diagram of a contention-free random access procedure provided by the embodiment of the present application. In Figure 8In the process where the terminal initiates a random access procedure, the terminal sends a first signal to the base station. The first signal can be a preamble code or a PRACH code. After receiving the above first signal, the base station returns an RAR to the terminal. Then, the terminal can switch the search space set after N time units from receiving the RAR. For example, it switches from the second search space set to the first search space set and starts monitoring the PDCCH according to the first search space set. Within the above N time units, the terminal can parse the received RAR to ensure that the search space set is switched after accurately receiving the RAR.

[0134] Generally, in the contention based RACH procedure, after the terminal sends a preamble code to the base station, the base station temporarily cannot distinguish which terminal sent the received preamble code. If the terminal switches the search space set after sending the preamble code, since the base station cannot distinguish the terminal that sent the preamble code, the base station will not synchronously switch the search space set at this time, which is likely to cause a mismatch in the switching timing between the terminal and the base station. When the terminal starts monitoring the PDCCH according to the switched search space set, it will result in unnecessary power consumption waste.

[0135] As Figure 9 shown, it is a schematic diagram of a random access procedure based on contention resolution provided by an embodiment of the present application. In the contention based RACH procedure, the terminal sends a first signal to the base station. The first signal can be a preamble code or a PRACH code. After receiving the above first signal, the base station returns an RAR to the terminal. Then, the terminal sends a second signal to the base station. After receiving the second signal sent by the terminal, the base station will start a random access contention resolution timer (ra-ContentionResolutionTimer). If the second signal sent by the terminal includes a C-RNTI MAC CE, the terminal will listen for the PDCCH scrambled with C-RNTI during the operation of the random access contention resolution timer. If the terminal receives the PDCCH scrambled with C-RNTI, it means that the contention resolution of the terminal is successful. At this time, the corresponding RACH procedure is successfully completed.

[0136] Since the PDCCH scrambled with the C-RNTI is monitored in the search space of type USS or Type3 CSS, and the USS and Type3 CSS are grouped, such as the first search space group or the second search space group. Therefore, in another possible implementation manner of the embodiment of the present application, in the contention-based random access (CRBA) procedure initiated in the RRC connected state, after the terminal sends a second signal including the C-RNTI MACCE to the base station, the terminal can switch the search space group. For example, switch from the second search space group to the first search space group and start monitoring the PDCCH according to the first search space group.

[0137] Based on Figure 9 as shown in Figure 10 FIG. [FIGURE NUMBER] is a schematic diagram of the start-up process of a random access contention resolution timer provided by an embodiment of the present application. When the terminal sends a second signal to the base station, the terminal and the base station will respectively maintain a random access contention resolution timer. Therefore, when the random access contention resolution timer starts, the terminal can switch the search space group, from the second search space group to the first search space group. During the operation of the random access contention resolution timer, the terminal monitors the PDCCH according to the first search space group.

[0138] Since in the contention-based random access process, the base station cannot distinguish which terminal sent the preamble code, the base station will not immediately switch the search space group after receiving the preamble code. If the terminal switches the search space group too early, it will cause a mismatch in the handover timing between the terminal and the base station, resulting in unnecessary PDCCH monitoring and increasing the power consumption of the terminal. Therefore, in the embodiment of the present application, the terminal can switch the search space group only after sending the second signal including the C-RNTI MACCE. Since the base station can already identify which terminal initiated the random access process at this time, the base station can complete the switch of the search space group synchronously with the terminal, ensuring that the handover timings of the two match, which helps to reduce the power consumption of the terminal.

[0139] In the foregoing embodiments S401-S402, when the terminal receives the DCI indicating the arrival of downlink traffic, the terminal can start monitoring the PDCCH according to the first search space group with a relatively small monitoring period. Similarly, when uplink traffic arrives, there is also data to be transmitted between the terminal and the base station.

[0140] Therefore, in another possible implementation manner of the embodiment of the present application, the first signal may also be a scheduling request SR.

[0141] Generally, when the terminal has data to be transmitted to the base station, that is, when there is uplink data waiting to be transmitted at the terminal, the terminal can first send an SR to the base station. After receiving the SR, the base station will send DCI to schedule the PUSCH transmission. At this time, in order to ensure that the uplink data can be transmitted as soon as possible, after sending the SR, the terminal can monitor the PDCCH according to the first search space set with a relatively small monitoring period. Specifically, if the terminal is monitoring the PDCCH according to the second search space set when sending the SR, then after sending the SR, the terminal can stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set. Or after sending the SR, the terminal can start monitoring the PDCCH according to the first search space set and the second search space set. If the terminal is monitoring the PDCCH according to the first search space set when sending the SR, then after sending the SR, the terminal can also continue to monitor the PDCCH according to the first search space set.

[0142] In the embodiment of the present application, when the terminal sends signals such as a preamble code or an SR to the base station, it can indicate that the terminal currently needs to quickly access the base station to restore the normal state or there is uplink data arriving at the terminal. Therefore, after sending the preamble code or the SR, the terminal can start monitoring the PDCCH according to the first search space set with a relatively small monitoring period to achieve the rapid recovery of services or the rapid scheduling of the above data.

[0143] In an embodiment of the present application, for the semi-static scheduling scenario, such as downlink semi-persistent scheduling (DL SPS), or configured uplink grant, such as configured UL grant Type 1 or Type 2, once configured or activated, without the need for dynamic scheduling authorization, the terminal can receive the PDSCH or transmit the PUSCH at a certain period. For example, for DL SPS or configured UL grant Type 2, relevant parameters can be configured through RRC signaling. If the terminal receives a DCI (transmitted by a PDCCH scrambled with CS-RNTI) that activates DL SPS or configured UL grant Type 2, the terminal can start receiving the PDSCH of DL SPS periodically or transmitting the PUSCH periodically. It can be seen that after the base station sends the activation DCI (the activation DCI indicates the time-frequency resources of the first PDSCH / PUSCH), there is no need to send a new scheduling DCI, and the terminal can send and receive data on the semi-statically configured resources. The base station can release the semi-static resources of DL SPS or configured UL grant Type 2 by sending a DCI. After receiving the release DCI (this DCI is also transmitted by a PDCCH scrambled with CS-RNTI), the terminal can stop receiving the PDSCH of DL SPS or stop transmitting the semi-static PUSCH. For configured UL grant Type 1, the activation or release of the semi-static PUSCH resources is configured through RRC signaling.

[0144] During semi-static scheduling, since the base station does not need to send dynamic scheduling DCIs for semi-static PDSCH / PUSCH resources, the terminal may not hear a DCI in a certain search space group with a relatively small monitoring period for a period of time, and thus switch to another search space group with a relatively large monitoring period to monitor the PDCCH. For example, if the terminal does not hear a DCI for a period of time, the InactivityTimer will not be restarted, and after the InactivityTimer times out, the terminal will switch from the first search space group to the second search space group.

[0145] However, during semi-static scheduling, the start of the discontinuous reception (DRX) retransmission timer may be triggered. When the DRX retransmission timer is running, there may be retransmitted data, and the terminal needs to monitor the PDCCH scrambled with CS-RNTI. AsFigure 11 As shown, it is a schematic diagram of the startup process of a discontinuous reception downlink retransmission timer (drx-RetransmissionTimerDL) provided by an embodiment of the present application. In Figure 11 , for DL SPS, if the terminal feeds back a negative acknowledgment (NACK) of the hybrid automatic repeat request (HARQ) in a HARQ feedback, it indicates that the terminal fails to correctly decode the PDSCH. Then, after the corresponding discontinuous reception downlink HARQ round-trip time timer (drx-HARQ-RTT-TimerDL) times out, the terminal will start the drx-RetransmissionTimerDL. During the operation of the drx-RetransmissionTimerDL, the terminal can monitor the PDCCH to expect to receive retransmitted data.

[0146] As Figure 12 shown, it is a schematic diagram of the startup process of another discontinuous reception uplink retransmission timer provided by an embodiment of the present application. In Figure 12 the uplink data transmission process shown, after the terminal sends the PUSCH, it will start the drx-HARQ-RTT-TimerUL. Whenever the drx-HARQ-RTT-TimerUL times out, the terminal starts the drx-RetransmissionTimerUL. During the operation of the drx-RetransmissionTimerUL, the terminal will monitor possible uplink retransmission scheduling.

[0147] Then, when the corresponding retransmission timer, such as the drx-RetransmissionTimerDL or the discontinuous reception uplink retransmission timer (drx-RetransmissionTimerUL), is running, if the terminal monitors a search space set with a relatively large monitoring period, such as the second search space set, it may increase the retransmission scheduling delay of the terminal.

[0148] Therefore, in the embodiment of the present application, when the discontinuous reception retransmission timer is running, the terminal can monitor the PDCCH according to the first search space set with a relatively small monitoring period to reduce the retransmission delay and reduce the data delay. It should be noted that the above discontinuous reception retransmission timer includes the discontinuous reception downlink retransmission timer (drx-RetransmissionTimerDL) or the discontinuous reception uplink retransmission timer (drx-RetransmissionTimerUL).

[0149] In an embodiment of the present application, if the terminal does not monitor any DCI within the first search space set during the operation of the discontinuous reception retransmission timer, after the discontinuous reception retransmission timer expires, the terminal can switch the search space set, switching from the first search space set with a relatively small monitoring period to the second search space set with a relatively large monitoring period, and monitor the PDCCH according to the second search space set to save the power consumption of the terminal.

[0150] In a possible implementation manner of an embodiment of the present application, when the base station configures a search space set for the terminal, a timer (InactivityTimer) can be introduced. When the timer is running, the terminal can monitor the PDCCH according to the search space set with a relatively small monitoring period, such as the first search space set. After the timer expires, the terminal can switch to the search space set with a relatively large monitoring period, such as the second search space set. The above timer can be referred to as the first search space set timer.

[0151] A possible condition for triggering the start or restart of the first search space set timer is that the terminal monitors any one DCI format within the search space of the first search space set or the second search space set.

[0152] In a possible implementation manner of an embodiment of the present application, the terminal can start or restart the first search space set timer when any of the following conditions is met:

[0153] When the ra-ContentionResolutionTimer starts, after the terminal successfully receives the RAR sent by the base station, or when the discontinuous reception retransmission timer starts.

[0154] Exemplarily, taking the discontinuous reception uplink retransmission timer (drx-RetransmissionTimerUL) as an example, as Figure 13 shown, it is a schematic diagram of the start or restart process of a first search space set timer provided by an embodiment of the present application. In Figure 13 , when the first search space set timer starts, the terminal monitors the PDCCH according to the first search space set. During the operation of the first search space set timer, when the discontinuous reception uplink retransmission timer starts, the first search space set timer restarts, and the terminal continues to monitor the PDCCH according to the first search space set. After the discontinuous reception uplink retransmission timer expires, if the first search space set timer is still running, the terminal will continue to monitor the PDCCH according to the first search space set until the first search space set timer expires, and then the terminal starts to monitor the PDCCH according to the second search space set.

[0155] In another possible implementation manner of the embodiment of the present application, the first search space set timer may operate according to a set start or restart mechanism. However, when any of the following conditions is met, after the first search space set timer times out, the terminal delays the handover of the first search space set. That is, when any of the following conditions is met, after the first search space set timer times out, the terminal still monitors the PDCCH according to the first search space set and does not switch to the second search space set:

[0156] Condition 1: The first search space set timer times out while the ra-ContentionResolutionTimer is running.

[0157] During the running of the ra-ContentionResolutionTimer, regardless of whether the first search space set timer times out, the terminal monitors the PDCCH according to the first search space set. If the terminal does not receive the PDCCH scrambled with C-RNTI during the running of the ra-ContentionResolutionTimer, then after the ra-ContentionResolutionTimer times out, the terminal switches to the second search space set; otherwise, the terminal starts or restarts the first search space set timer when it detects the PDCCH scrambled with C-RNTI.

[0158] Condition 2: The first search space set timer times out while the retransmission timer for discontinuous reception is running.

[0159] During the running of the retransmission timer for discontinuous reception, regardless of whether the first search space set timer times out, the terminal monitors the PDCCH according to the first search space set. If the terminal does not receive the PDCCH scheduling retransmitted data during the running of the retransmission timer for discontinuous reception and does not detect any other arbitrary DCI format in each search space of the first search space set, then after the retransmission timer for discontinuous reception times out, the terminal switches to the second search space set; otherwise, the terminal starts or restarts the first search space set timer when it detects the PDCCH scheduling retransmitted data (or any one DCI format) in each search space of the first search space set.

[0160] Exemplarily, taking the retransmission timer for discontinuous reception of the uplink (drx-RetransmissionTimerUL) as an example, as Figure 14 shown, it is a schematic diagram of another start or restart process of the first search space set timer provided by the embodiment of the present application. In Figure 14In [the situation], when the first search space set timer starts, the terminal monitors the PDCCH according to the first search space set. During the running of the first search space set timer, when the non-continuous reception uplink retransmission timer starts, the terminal continues to monitor the PDCCH according to the first search space set. After the first search space set timer expires, if the non-continuous reception uplink retransmission timer is still running, the terminal will continue to monitor the PDCCH according to the first search space set. If the first search space set timer does not restart during the running of the non-continuous reception uplink retransmission timer, then until the non-continuous reception uplink retransmission timer expires, the terminal starts to monitor the PDCCH according to the second search space set.

[0161] Condition 3: After the terminal successfully receives the RAR sent by the base station and before receiving the newly transmitted data, the first search space set timer expires.

[0162] In this case, after the first search space set timer expires, the terminal does not perform the handover of the search space set and still monitors the PDCCH according to the first search space set. After the terminal receives the PDCCH indicating the newly transmitted data, it starts or restarts the first search space set timer.

[0163] In a possible implementation manner of the embodiment of the present application, the configurations of the first search space set and the second search space set in S401 and S601 have a nested relationship.

[0164] In a specific implementation, when the base station configures the first configuration parameter of the first search space set and the second configuration parameter of the second search space set for the terminal, it can limit the values of the first configuration parameter and the second configuration parameter, so that the parameters related to time domain monitoring in the second configuration parameter are a subset of the parameters related to time domain monitoring in the first configuration parameter; and / or, the parameters related to frequency domain monitoring in the second configuration parameter are a subset of the parameters related to frequency domain monitoring in the first configuration parameter. Or it can be described as that the base station can limit the values of the first configuration parameter and the second configuration parameter, so that the time domain monitoring positions of the second search space set are a subset of the time domain monitoring positions of the first search space set; and / or, the frequency domain monitoring positions of the second search space set are a subset of the frequency domain monitoring positions of the first search space set.

[0165] In a possible implementation manner of the embodiment of the present application, the parameters related to time domain monitoring in the first configuration parameter include the monitoring period of the first search space set, and the parameters related to time domain monitoring in the second configuration parameter include the monitoring period of the second search space set. Therefore, the parameters related to time domain monitoring in the second configuration parameter being a subset of the parameters related to time domain monitoring in the first configuration parameter can mean that the monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

[0166] Among them, the monitoring period of the second search space group is an integer multiple of the monitoring period of the first search space group. It can be understood that the monitoring period of a search space included in the second search space group is an integer multiple of the monitoring period of a search space included in the first search space group.

[0167] In a possible implementation manner of the embodiment of the present application, the monitoring period of each search space included in the second search space group is an integer multiple of the monitoring period of a certain search space included in the first search space group.

[0168] Exemplarily, the first search space group includes a first search space and a second search space, and the second search space group includes a third search space, a fourth search space, and a fifth search space. Among them, the monitoring periods of the first search space and the second search space may be 3 time slots and 4 time slots respectively. Correspondingly, the monitoring periods of the third search space, the fourth search space, and the fifth search space may be 6 time slots, 9 time slots, and 12 time slots respectively. In this case, the monitoring period of each search space (the third search space, the fourth search space, and the fifth search space) in the second search space group is an integer multiple of the monitoring period of a certain search space (the first search space) in the first search space group.

[0169] In another possible implementation manner of the embodiment of the present application, among the multiple search spaces included in the second search space group, the monitoring periods of some search spaces are integer multiples of the monitoring period of a certain search space in the first search space group.

[0170] Exemplarily, the first search space set includes a first search space and a second search space, and the second search space set includes a third search space, a fourth search space, and a fifth search space. Among them, the monitoring periods of the first search space and the second search space can be 3 time slots and 4 time slots respectively. Correspondingly, the monitoring periods of the third search space, the fourth search space, and the fifth search space can be 6 time slots, 9 time slots, and 10 time slots respectively. In this case, the monitoring periods of some search spaces (the third search space and the fourth search space) in the second search space set are integer multiples of the monitoring period of a certain search space (the first search space) in the first search space set. Taking the monitoring period and offset value (monitoringSlotPeriodicityAndOffset) of the time slots to be monitored as an example, the monitoring period of the search spaces included in the second search space set can be configured as 5 time slots (slot), and the monitoring period of the search spaces included in the first search space set can be configured as 1 slot; or, the monitoring period of the search spaces included in the second search space set can be configured as 6 slots, and the monitoring period of the search spaces included in the first search space set can be configured as 2 slots. In this way, by configuring the monitoring period of the second search space set as an integer multiple of the monitoring period of the first search space set, the following purpose can be achieved: the set of monitoring time slots obtained by the terminal according to the monitoring period of the first search space set is a subset of the set of monitoring time slots obtained according to the monitoring period of the second search space set.

[0171] In this way, when the time slots of the base station and the terminal are not aligned due to certain error situations (for example, in the foregoing embodiment S502, after the terminal sends the SR, it starts to monitor the PDCCH according to the first search space set, but since the base station may not successfully receive the SR sent by the terminal, the base station may think that the terminal is still using the second search space set to monitor the PDCCH), the scheduling information sent by the base station can be received by the terminal.

[0172] In another possible implementation manner of the embodiment of the present application, the parameters related to time domain monitoring in the first configuration parameter include the monitoring symbol set of the first search space set, and the parameters related to time domain monitoring in the second configuration parameter include the monitoring symbol set of the second search space set. Therefore, the parameters related to time domain monitoring in the second configuration parameter being a subset of the parameters related to time domain monitoring in the first configuration parameter may mean that: the monitoring symbol set of the second search space set is a subset of the monitoring symbol set of the first search space set.

[0173] Among them, the monitoring symbol set of the second search space set being a subset of the monitoring symbol set of the first search space set can be understood as that the monitoring symbol set of a search space included in the second search space set is a subset of the monitoring symbol set of a search space included in the first search space set.

[0174] In an embodiment of the present application, the set of monitoring symbols for each search space may be determined according to the duration of the CORESET associated with the search space and monitoringSymbolsWithinSlot. Therefore, when the base station configures parameters for the first search space set and the second search space set, on the basis of configuring the monitoring period of the search spaces included in the second search space set as an integer multiple of the monitoring period of the first search space set, the set of symbols to be monitored determined according to the duration of the CORESET and monitoringSymbolsWithinSlot in the search spaces included in the second search space set may be configured as a subset of the set of symbols to be monitored determined according to the duration of the CORESET and monitoringSymbolsWithinSlot in the search spaces included in the first search space set.

[0175] In a possible implementation manner of the embodiment of the present application, the parameters related to frequency-domain monitoring in the first configuration parameter include the set of frequency-domain monitoring positions of the first search space set, and the parameters related to frequency-domain monitoring in the second configuration parameter include the set of frequency-domain monitoring positions of the second search space set. Therefore, the parameters related to frequency-domain monitoring in the second configuration parameter being a subset of the parameters related to frequency-domain monitoring in the first configuration parameter may mean that the set of frequency-domain monitoring positions of the second search space set is a subset of the set of frequency-domain monitoring positions of the first search space set.

[0176] Among them, the set of frequency-domain monitoring positions of the second search space set being a subset of the set of frequency-domain monitoring positions of the first search space set may be understood as that the set of frequency-domain monitoring positions of a search space included in the second search space set is a subset of the set of frequency-domain monitoring positions of a search space included in the first search space set.

[0177] In an embodiment of the present application, the set of frequency-domain monitoring positions of each search space set may refer to the number of PDCCH candidate positions (nrofCandidates) that need to be blindly detected at each aggregation level, that is, the value of aggregationLevelx.

[0178] If the value of aggregationLevelx in the second search space set is configured as {aggregationLevel1 = n8, aggregationLevel2 = n4, aggregationLevel4 = n4, aggregationLevel8 = n2, aggregationLevel16 = n0}, then the value of aggregationLevelx in the first search space set can be configured as {aggregationLevel1 = n8, aggregationLevel2 = n6, aggregationLevel4 = n6, aggregationLevel8 = n4, aggregationLevel16 = n2}.

[0179] That is, by configuring the number of PDCCH candidate positions that need to be blindly detected for each aggregation level in the second search space set with a relatively larger monitoring period to be greater than or equal to the number of PDCCH candidate positions that need to be blindly detected for each aggregation level in the first search space set with a relatively smaller monitoring period, the following purpose can be achieved: the set of frequency-domain monitoring positions obtained by the terminal according to the second search space set belongs to the subset of the set of frequency-domain monitoring positions obtained according to the first search space set.

[0180] In the above embodiment, optionally, in order to ensure that the number of PDCCH candidate positions that need to be blindly detected for each aggregation level is in a nested relationship, it can be restricted that the CORESET associated with the second search space set is the same as the CORESET associated with the first search space set. Or, it can be stated that the CORESET associated with a search space included in the second search space set is the same as the CORESET associated with a search space included in the first search space set.

[0181] In the embodiment of the present application, by restricting the values of the first configuration parameter of the first search space set and the second configuration parameter of the second search space set, it can be ensured that the monitoring positions of the second search space set all belong to the monitoring positions of the first search space set. Thus, in the case where the time slots of the base station and the terminal are not aligned, the loss of scheduling can be avoided, and it is ensured that the scheduling information sent by the base station or the terminal can be successfully received by the other party, improving the success rate of sending scheduling information.

[0182] For ease of understanding, the PDCCH monitoring method provided in the embodiment of the present application will be introduced below with several specific examples respectively.

[0183] In the following examples, the base station may pre-configure two search space sets for the terminal: set 0 and set 1; among them, set 0 may be the first search space set in the foregoing embodiments, and set 1 may be the second search space set in the foregoing embodiments, and the monitoring period of set 0 is less than the monitoring period of set 1. The search spaces included in set 0 and set 1 both belong to the user equipment specific search space UESS, and the terminal also needs to monitor the PDCCH in the common search space CSS.

[0184] Example 1:

[0185] When the terminal monitors the PDCCH according to set 1, if the target DCI is received, the terminal switches from set 1 to set 0 and starts to monitor the PDCCH according to set 0; among them, the target DCI needs to satisfy at least one of the following conditions:

[0186] The target DCI is a DCI scrambled with C-RNTI, MCS-C-RNTI or CS-RNTI; or,

[0187] The target DCI is a DCI scrambled with C-RNTI, MCS-C-RNTI or CS-RNTI in the UESS; or,

[0188] The target DCI is a DCI scrambled with C-RNTI, MCS-C-RNTI or CS-RNTI in the UESS or CSS type 3.

[0189] In this example, a possible reason for switching from search space set 1 to search space set 0 (that is, from the search space set with a large monitoring period to the search space set with a small monitoring period) is that after the data of the terminal arrives, the monitoring period changes from a large one to a small one, which helps to quickly perform data scheduling. One of the signs of "data arrival" is that the terminal receives a scheduling DCI. In the current standard, the scheduling DCI corresponds to a DCI scrambled with C-RNTI, MCS-C-RNTI or CS-RNTI.

[0190] In the current standard, the terminal can monitor the DCI scrambled with C-RNTI, MCS-C-RNTI or CS-RNTI in the UESS and CSS type 3. Therefore, the above DCI scrambled with C-RNTI, MCS-C-RNTI or CS-RNTI can be the DCI monitored in the UESS or CSS type 3.

[0191] Since the terminal always monitors the CSS except for the UESS, it is also possible to determine the search space where the above-mentioned DCI scrambled with the C-RNTI, MCS-C-RNTI, or CS-RNTI is monitored. For example, the terminal switches from search space set 1 to search space set 0 only when the DCI scrambled with the C-RNTI, MCS-C-RNTI, or CS-RNTI is monitored in the UESS. When the DCI scrambled with the C-RNTI, MCS-C-RNTI, or CS-RNTI is monitored in the CSS, the terminal does not switch the search space set. In this way, the data volume can be more flexibly adapted. For example, when a large amount of data arrives at the terminal, the terminal is scheduled in the UESS, and then the terminal switches from search space set 1 to search space set 0, so as to quickly perform data scheduling. If only a small amount of data arrives at the terminal, the terminal can be scheduled in the CSS. After the terminal completes data transmission, it can still monitor the PDCCH according to search space set 1 (with a larger monitoring period), thereby reducing the power consumption of the terminal and reducing the signaling overhead. It can be understood that the embodiments of the present application do not limit the monitoring periods of search space set 1 and search space set 0 and the relationship between the two.

[0192] Example 2:

[0193] When the terminal monitors the PDCCH according to search space set 1, if the terminal sends a PRACH, the terminal can switch from search space set 1 to search space set 0.

[0194] In this example, a possible reason for switching from search space set 1 to search space set 0 (that is, from the search space set with a large monitoring period to the search space set with a small monitoring period) is that when some abnormal states occur in the terminal, the terminal should switch to a smaller monitoring period to monitor the PDCCH for quick recovery. The abnormal states may include: radio link failure, beam failure, or uplink out-of-sync, etc. In these cases, the terminal initiates a random access procedure to restore normal. At this time, the priority of restoring the normal state should be greater than energy saving. Therefore, the terminal should switch back to search space set 0. And the first step of recovering the above abnormal states is that the terminal sends a PRACH to the base station. Therefore, the PRACH can be used as a possible judgment condition, under which the terminal switches back to search space set 0.

[0195] In this example, the specific time when the terminal starts to monitor the PDCCH according to search space set 0 can be further refined.

[0196] For example, it is relatively simple and easy to start monitoring the PDCCH according to search space set 0 at the beginning of the next time slot when the terminal sends the PRACH; alternatively, when the terminal receives the DCI scrambled by the RA-RNTI and the DCI corresponds to non-competitive access, start monitoring the PDCCH according to search space set 0 after this DCI (for example, in the next time slot after this DCI). It can be understood that the embodiments of the present application do not limit the monitoring periods of search space set 1 and search space set 0 and the relationship between the two.

[0197] After the terminal sends the PRACH, it will receive the RAR sent by the base station, and the RAR is scheduled by the DCI scrambled by the RA-RNTI. In the case of non-competitive access, after the terminal receives the DCI scrambled by the RA-RNTI, it means that the terminal has successfully accessed. After that, the terminal generally starts data scheduling. The DCI scrambled by the RA-RNTI in CSS type1 is not affected by the switching of search space set 0 or search space set 1. Therefore, it is possible to switch back to search space set 0 after the terminal receives the DCI scrambled by the RA-RNTI. It can be understood that the embodiments of the present application do not limit the monitoring periods of search space set 1 and search space set 0 and the relationship between the two.

[0198] Example 3:

[0199] In the above Example 2, for the contention-free based RACH (CFRA) process, after the terminal receives the PDCCH scrambled by the RA-RNTI, it switches from search space set 1 to search space set 0. Considering the parsing time of the RAR by the terminal, there will be an effective delay (how long after receiving the RAR to start switching to search space set 0). When the terminal receives the PDCCH scrambled by the RA-RNTI, it does not mean that the RACH is successful. Because the PDSCH scheduled by this PDCCH may not contain the RAR of this terminal. At this time, the RAR is actually received unsuccessfully, and the RACH is not successful either. (The PDSCH scheduled by the RA-RNTI may carry the RARs of multiple terminals).

[0200] Therefore, in this example, the terminal can switch the search space group after N time units after receiving the RAR and start monitoring the PDCCH according to search space set 0; or, the terminal can switch the search space group in the first time slot after N time units after receiving the RAR and start monitoring the PDCCH according to search space set 0. It can be understood that the embodiments of the present application do not limit the monitoring periods of search space set 1 and search space set 0 and the relationship between the two.

[0201] Example 4:

[0202] In the above Example 2, after the terminal sends the PRACH (the first signal), it switches from search space set 1 to search space set 0. This example is for the contention-based RACH procedure in the RRC connected state. On the basis of Example 2, another condition for triggering the terminal to switch the search space set is added. That is, after the terminal sends the second signal to the base station, it switches from search space set 1 to search space set 0. Among them, the process of the terminal sending the second signal to the base station may refer to the process of the terminal sending a signal to the base station after sending the first signal to the base station and receiving the RAR returned by the base station for the first signal.

[0203] In this example, when the terminal initiates a contention-based RACH procedure (CBRA, that is, the second signal includes a C-RNTI MAC CE) in the RRC connected state, it may be that beam failure has occurred, the terminal requests beam failure recovery (BFR), or the terminal requests uplink resource scheduling, or the terminal receives a PDCCH order from the base station.

[0204] In this example, for the contention-based RACH procedure, if the second signal includes a C-RNTI MAC CE, and if the terminal is currently monitoring the PDCCH according to search space set 1 with a relatively large monitoring period, after the terminal sends the second signal, it can switch to search space set 0 with a relatively small monitoring period to monitor the PDCCH.

[0205] Alternatively, when the ra-ContentionResolutionTimer is running, the terminal can switch to search space set 0 to monitor the PDCCH. It can be understood that the embodiments of the present application do not limit the monitoring periods of search space set 1 and search space set 0 and the relationship between the two.

[0206] Example 5:

[0207] When the terminal monitors the PDCCH according to search space set 1, if the terminal sends the PRACH or SR, the terminal can switch from search space set 1 to search space set 0.

[0208] In this example, the specific time when the terminal starts to monitor the PDCCH according to search space set 0 can be further refined. For example, start monitoring the PDCCH according to search space set 0 in the next time slot after the terminal sends the PRACH or SR.

[0209] In Example 1, it is for the case where downlink data arrives. When uplink data arrives, the terminal should also switch from the search space set of the large monitoring period to the search space set of the small monitoring period, so as to quickly perform data scheduling. Since after the uplink data arrives, the methods for the terminal to request uplink resources can include the following two: the terminal sends an SR; or, the terminal sends a PRACH. Therefore, in this example, both of these can be used as the conditions for the terminal to switch back from search space set 1 to search space set 0. It can be understood that the embodiments of the present application do not limit the monitoring periods of search space set 1 and search space set 0, and the relationship between the two.

[0210] Example 6:

[0211] When the base station configures a search space set for the terminal, it can configure a timer SSSG0-InactivityTimer for search space set 0. When this timer is running, the terminal monitors the PDCCH according to search space set 0; when this timer times out, the terminal switches to search space set 1 and uses the search space set with a relatively larger monitoring period to monitor the PDCCH.

[0212] On the other hand, for the scenario of semi-static scheduling, during semi-static scheduling, the start of the DRX retransmission timer may be triggered. When the DRX retransmission timer is running, there may be retransmitted data, and the terminal needs to listen to the PDCCH scrambled with CS-RNTI. Then, when the corresponding retransmission timer is running, if the terminal monitors the PDCCH according to the search space set 1 with a relatively larger monitoring period, it may increase the retransmission scheduling delay.

[0213] Therefore, in this example, when the retransmission timer is running, the terminal can switch to search space set 0 with a relatively smaller monitoring period to listen to the PDCCH to reduce data delay; if the terminal does not hear any DCI within search space set 0 during the running of the retransmission timer, after the above retransmission timer times out, the terminal can switch the search space set, switching from search space set 0 with a relatively smaller monitoring period to search space set 1 with a relatively larger monitoring period, and listen to the PDCCH according to search space set 1 to save the power consumption of the terminal. It can be understood that the embodiments of the present application do not limit the monitoring periods of search space set 1 and search space set 0, and the relationship between the two.

[0214] Example 7:

[0215] In the above Examples 1 to 6, when the base station configures a search space set for the terminal, it can also limit the value range of the configuration parameters of the search space set, so that the configuration parameters of search space set 0 and search space set 1 have a nested relationship, and the monitoring positions of search space set 1 all belong to the monitoring positions of search space set 0. That is, the monitoring positions of search space set 1 are a subset of the monitoring positions of search space set 0.

[0216] In this way, when the time slots on both sides of the base station and the terminal are not aligned due to some error conditions, the scheduling information sent by the base station can still be received by the terminal.

[0217] For example, in the time dimension, the monitoring period of the search space in group 1 can be configured as 5 time slots (slots), and the monitoring period of the search space in group 0 can be configured as 1 slot; or, the monitoring period of the search space in group 1 can be configured as 6 slots, and the monitoring period of the search space in group 0 can be configured as 2 slots. In this way, the monitoring period of the search space in group 1 is an integer multiple of the monitoring period of the search space in group 0, so that the set of monitoring time slots obtained by the terminal according to the monitoring period of group 1 is a subset of the set of monitoring time slots obtained according to the monitoring period of group 0.

[0218] Based on the above monitoring period configuration, the set of symbols to be monitored in group 1 can also be configured as a subset of the set of symbols to be monitored in group 0.

[0219] For another example, in the frequency dimension, the CORESET associated with the search spaces included in group 0 and group 1 can be configured to be the same, and at the same time, the number of PDCCH candidate positions that need to be blindly detected for each aggregation level of the search space in group 1 with a relatively larger monitoring period is configured to be greater than or equal to the number of PDCCH candidate positions that need to be blindly detected for each aggregation level of the search space in group 0 with a relatively smaller monitoring period. In this way, the set of frequency-domain monitoring positions obtained by the terminal according to group 1 is a subset of the set of frequency-domain monitoring positions obtained according to group 0.

[0220] It can be understood that the embodiments of the present application do not limit the monitoring periods of search space group 1 and search space group 0, nor the relationship between them.

[0221] The above mainly introduces the method provided by the embodiments of the present application from the perspective of the interaction between each network element. It can be understood that each network element, such as a terminal and a network device, includes a corresponding hardware structure or software module, or a combination of both, to implement the above functions. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed in this article, the present application can be implemented in the form of hardware, or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0222] The embodiments of the present application can divide the functions of the terminal according to the above method examples. For example, each function module can be divided corresponding to each function, or one or more functions can be integrated into one function module. The above integrated module can be implemented in the form of hardware or in the form of a software function module. It should be noted that the division of modules in the embodiments of the present application is illustrative, only a logical function division, and there may be other division methods in actual implementation. The following takes the integration of one or more functions into one function module as an example for illustration:

[0223] Figure 15 It is a schematic structural diagram of a communication device provided by an embodiment of the present application. As Figure 15 shown, the communication device includes a communication module 1501 and a processing module 1502.

[0224] Optionally, the communication device can at least execute one of the following solutions:

[0225] Solution 1: The communication module 1501 is used to receive the search space information configured by the network device, and the search space information includes the information of the first search space group and the second search space group.

[0226] The processing module 1502 is used to, when the terminal monitors the PDCCH according to the second search space group, if the terminal receives the downlink control information DCI for data scheduling, stop monitoring the PDCCH according to the second search space group, and start monitoring the PDCCH according to the first search space group.

[0227] In a possible implementation manner, the downlink control information DCI for data scheduling includes DCI scrambled with any one of the following RNTIs:

[0228] Cell Radio Network Temporary Identifier C-RNTI, Modulation and Coding Scheme Radio Network Temporary Identifier MCS-C-RNTI, or Configured Scheduling Radio Network Temporary Identifier CS-RNTI.

[0229] In a possible implementation manner, the downlink control information DCI for data scheduling is DCI within the User Equipment Specific Search Space UESS or DCI within the Third Type of Common Search Space CSS type 3.

[0230] In a possible implementation manner, the first search space group has first configuration parameters, and the second search space group has second configuration parameters; the parameters related to time-domain monitoring in the second configuration parameters are a subset of the parameters related to time-domain monitoring in the first configuration parameters; and / or, the parameters related to frequency-domain monitoring in the second configuration parameters are a subset of the parameters related to frequency-domain monitoring in the first configuration parameters.

[0231] In a possible implementation, the parameters related to time-domain monitoring in the first configuration parameter include the monitoring period of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameter include the monitoring period of the second search space set; correspondingly, the parameters related to time-domain monitoring in the second configuration parameter are a subset of the parameters related to time-domain monitoring in the first configuration parameter, and may be: the monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

[0232] In a possible implementation, the parameters related to time-domain monitoring in the first configuration parameter include the monitoring symbol set of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameter include the monitoring symbol set of the second search space set; correspondingly, the parameters related to time-domain monitoring in the second configuration parameter are a subset of the parameters related to time-domain monitoring in the first configuration parameter, and may be: the monitoring symbol set of the second search space set is a subset of the monitoring symbol set of the first search space set.

[0233] In a possible implementation, the parameters related to frequency-domain monitoring in the first configuration parameter include the frequency-domain monitoring position set of the first search space set, and the parameters related to frequency-domain monitoring in the second configuration parameter include the frequency-domain monitoring position set of the second search space set; correspondingly, the parameters related to frequency-domain monitoring in the second configuration parameter are a subset of the parameters related to frequency-domain monitoring in the first configuration parameter, and may be: the frequency-domain monitoring position set of the second search space set is a subset of the frequency-domain monitoring position set of the first search space set.

[0234] Among them, the relevant information of the downlink control information DCI, the first configuration parameter, and the second configuration parameter for data scheduling can be referred to Figure 4 the embodiments shown, which will not be elaborated here.

[0235] Solution 2. The communication module 1501 is configured to receive the search space information configured by the network device, and the search space information includes the information of the first search space set and the second search space set;

[0236] The processing module 1502 is configured to, when the terminal monitors the PDCCH according to the second search space set, if the terminal sends a first signal to the network device, after sending the first signal, stop monitoring the PDCCH according to the second search space set, and start monitoring the PDCCH according to the first search space set. The first signal includes at least one of the following signals or channels: random access preamble code, scheduling request SR, hybrid automatic repeat request negative acknowledgment NACK, and / or physical uplink shared channel PUSCH.

[0237] In a possible implementation, the processing module 1502 is configured to stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set in the next time slot after the terminal sends the preamble code.

[0238] In a possible implementation, the processing module 1502 is configured to, when the terminal receives DCI scrambled with a random access radio network temporary identifier (RA-RNTI); if the preamble code is used for non-competitive access, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0239] In a possible implementation, the processing module 1502 is configured to, when the terminal receives a random access response (RAR) returned by the network device for the first signal; if the preamble code is used for non-competitive access, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0240] In a possible implementation, the processing module 1502 is configured to stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set after a preset number of time units after the terminal receives DCI scrambled with RA-RNTI, or after a preset number of time units after the terminal receives the random access response (RAR) returned by the network device for the first signal.

[0241] Wherein, the time unit includes any one of the following:

[0242] Orthogonal frequency division multiplexing (OFDM) symbol, time slot, or millisecond.

[0243] In a possible implementation, the processing module 1502 is configured to stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set in the first time slot after a preset number of time units after the terminal receives DCI scrambled with RA-RNTI, or in the first time slot after a preset number of time units after the terminal receives the random access response (RAR) returned by the network device for the first signal.

[0244] In a possible implementation, the processing module 1502 is configured to, after the terminal receives the random access response (RAR) returned by the network device for the first signal, the terminal sends a second signal to the network device; if the preamble code is used for competitive access and the second signal includes a C-RNTI MAC control element, stop monitoring the PDCCH according to the second search space set after the terminal sends the second signal and start monitoring the PDCCH according to the first search space set.

[0245] In a possible implementation, the processing module 1502 is configured to, after the terminal sends a second signal, when the random access contention resolution timer is running, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0246] In a possible implementation, the processing module 1502 is configured to, when the retransmission timer is running, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set; wherein, the retransmission timer includes a downlink retransmission timer for discontinuous reception or an uplink retransmission timer for discontinuous reception.

[0247] In a possible implementation, the first search space set has first configuration parameters, and the second search space set has second configuration parameters; the parameters related to time-domain monitoring in the second configuration parameters are a subset of the parameters related to time-domain monitoring in the first configuration parameters; and / or, the parameters related to frequency-domain monitoring in the second configuration parameters are a subset of the parameters related to frequency-domain monitoring in the first configuration parameters.

[0248] In a possible implementation, the parameters related to time-domain monitoring in the first configuration parameters include the monitoring period of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameters include the monitoring period of the second search space set; correspondingly, the parameters related to time-domain monitoring in the second configuration parameters being a subset of the parameters related to time-domain monitoring in the first configuration parameters can be that: the monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

[0249] In a possible implementation, the parameters related to time-domain monitoring in the first configuration parameters include the monitoring symbol set of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameters include the monitoring symbol set of the second search space set; correspondingly, the parameters related to time-domain monitoring in the second configuration parameters being a subset of the parameters related to time-domain monitoring in the first configuration parameters can be that: the monitoring symbol set of the second search space set is a subset of the monitoring symbol set of the first search space set.

[0250] In a possible implementation, the parameters related to frequency-domain monitoring in the first configuration parameters include the frequency-domain monitoring position set of the first search space set, and the parameters related to frequency-domain monitoring in the second configuration parameters include the frequency-domain monitoring position set of the second search space set; correspondingly, the parameters related to frequency-domain monitoring in the second configuration parameters being a subset of the parameters related to frequency-domain monitoring in the first configuration parameters can be that: the frequency-domain monitoring position set of the second search space set is a subset of the frequency-domain monitoring position set of the first search space set.

[0251] Wherein, for the relevant information of the first signal, the second signal, the first configuration parameters, and the second configuration parameters, reference can be made toFigure 6 The embodiments shown are not described herein again.

[0252] As an example, in combination with Figure 3 the terminal shown, Figure 15 the communication module 1501 in Figure 3 can be implemented by the communication interface 304 in Figure 15 the processing module 1502 in Figure 3 can be implemented by the processor 301 in

[0253] The embodiments of the present application also provide a computer-readable storage medium, in which computer instructions are stored; when the computer-readable storage medium runs on a communication device, the communication device is caused to execute as Figure 4 or Figure 6 the method shown. The computer instructions can be stored in the computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more integrated media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium, or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0254] The embodiments of the present application also provide a computer program product containing computer instructions, which, when running on a terminal, enables the terminal to execute Figure 4 or Figure 6 the method shown.

[0255] The embodiments of the present application also provide a communication system, which includes a network device and a terminal, and the terminal is used to execute Figure 4 or Figure 6 the method shown.

[0256] Figure 16 is a schematic structural diagram of a chip provided by the embodiments of the present application. Figure 16 The chip shown can be a general-purpose processor or a dedicated processor. The chip includes a processor 1601. Among them, the processor 1601 is used to support the communication device to execute Figure 4 orFigure 6 The method shown

[0257] Optionally, the chip further includes a transceiver 1602, which is used to receive the control of the processor 1601 and support the communication device to execute Figure 4 or Figure 6 The method shown

[0258] Optionally, Figure 16 The chip shown may further include: a storage medium 1603

[0259] It should be noted that Figure 16 The chip shown can be implemented by using the following circuits or devices: one or more field programmable gate arrays (FPGAs), programmable logic devices (PLDs), controllers, state machines, gate logics, discrete hardware components, any other suitable circuits, or any combination of circuits capable of performing various functions described throughout this application

[0260] The terminal, network device, computer storage medium, computer program product, and chip provided in the above embodiments of the present application are all used to execute the method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects corresponding to the method provided above, and will not be elaborated here

[0261] Combined with the above, the present application provides the following embodiments

[0262] Embodiment 1. A method for monitoring a physical downlink control channel PDCCH, where the method is applied to a terminal and includes

[0263] The terminal receives the search space information configured by the network device, and the search space information includes the information of the first search space group and the second search space group

[0264] When the terminal monitors the PDCCH according to the second search space group, if the terminal receives the downlink control information DCI for data scheduling, the terminal stops monitoring the PDCCH according to the second search space group and starts monitoring the PDCCH according to the first search space group

[0265] Embodiment 2. The method according to Embodiment 1, where the downlink control information DCI for data scheduling includes DCI scrambled with any one of the following radio network temporary identifiers RNTIs

[0266] Cell radio network temporary identifier C-RNTI, modulation and coding strategy radio network temporary identifier MCS-C-RNTI, or configured scheduling radio network temporary identifier CS-RNTI

[0267] Embodiment 3. The method according to Embodiment 2, wherein the downlink control information DCI for data scheduling is DCI within a user equipment specific search space UESS or DCI within a third type common search space CSS type 3.

[0268] Embodiment 4. The method according to any one of Embodiments 1 - 3, wherein the first search space group has first configuration parameters, and the second search space group has second configuration parameters; the parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters; and / or, the parameters related to frequency domain monitoring in the second configuration parameters are a subset of the parameters related to frequency domain monitoring in the first configuration parameters.

[0269] Embodiment 5. The method according to Embodiment 4, wherein the parameters related to time domain monitoring in the first configuration parameters include the monitoring period of the first search space group, and the parameters related to time domain monitoring in the second configuration parameters include the monitoring period of the second search space group.

[0270] Correspondingly, the parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters, including: the monitoring period of the second search space group is an integer multiple of the monitoring period of the first search space group.

[0271] Embodiment 6. The method according to Embodiment 4, wherein the parameters related to time domain monitoring in the first configuration parameters include the monitoring symbol set of the first search space group, and the parameters related to time domain monitoring in the second configuration parameters include the monitoring symbol set of the second search space group.

[0272] Correspondingly, the parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters, including: the monitoring symbol set of the second search space group is a subset of the monitoring symbol set of the first search space group.

[0273] Embodiment 7. The method according to Embodiment 4, wherein the parameters related to frequency domain monitoring in the first configuration parameters include the frequency domain monitoring position set of the first search space group, and the parameters related to frequency domain monitoring in the second configuration parameters include the frequency domain monitoring position set of the second search space group.

[0274] Correspondingly, the parameters related to frequency domain monitoring in the second configuration parameters are a subset of the parameters related to frequency domain monitoring in the first configuration parameters, including: the frequency domain monitoring position set of the second search space group is a subset of the frequency domain monitoring position set of the first search space group.

[0275] Embodiment 8. A communication device, wherein the communication device can be a terminal, a chip in the terminal, or a system on a chip. The communication device includes: a processor and a memory. The memory stores instructions, and when the instructions are executed by the processor, the communication device performs the following steps: receiving search space information configured by a network device, where the search space information includes information on a first search space set and a second search space set; when the terminal monitors the PDCCH according to the second search space set, if the terminal receives downlink control information DCI for data scheduling, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0276] Embodiment 9. The communication device according to Embodiment 8, wherein the downlink control information DCI for data scheduling includes DCI scrambled with any one of the following radio network temporary identifiers RNTIs:

[0277] Cell Radio Network Temporary Identifier C-RNTI, Modulation and Coding Scheme Radio Network Temporary Identifier MCS-C-RNTI, or Configured Scheduling Radio Network Temporary Identifier CS-RNTI.

[0278] Embodiment 10. The communication device according to Embodiment 9, wherein the downlink control information DCI for data scheduling is DCI within a user equipment specific search space UESS or DCI within a third type of common search space CSS type 3.

[0279] Embodiment 11. The communication device according to any one of Embodiments 8 - 10, wherein the first search space set has first configuration parameters, and the second search space set has second configuration parameters; the parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters; and / or, the parameters related to frequency domain monitoring in the second configuration parameters are a subset of the parameters related to frequency domain monitoring in the first configuration parameters.

[0280] Embodiment 12. The communication device according to Embodiment 11, wherein the parameters related to time domain monitoring in the first configuration parameters include the monitoring period of the first search space set, and the parameters related to time domain monitoring in the second configuration parameters include the monitoring period of the second search space set.

[0281] Correspondingly, the parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters, including: the monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

[0282] Embodiment 13. The communication device according to Embodiment 11, wherein the parameters related to time-domain monitoring in the first configuration parameter include a set of monitoring symbols of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameter include a set of monitoring symbols of the second search space set.

[0283] Correspondingly, the parameters related to time-domain monitoring in the second configuration parameter are a subset of the parameters related to time-domain monitoring in the first configuration parameter, including: the set of monitoring symbols of the second search space set is a subset of the set of monitoring symbols of the first search space set.

[0284] Embodiment 14. The communication device according to Embodiment 11, wherein the parameters related to frequency-domain monitoring in the first configuration parameter include a set of frequency-domain monitoring positions of the first search space set, and the parameters related to frequency-domain monitoring in the second configuration parameter include a set of frequency-domain monitoring positions of the second search space set.

[0285] Correspondingly, the parameters related to frequency-domain monitoring in the second configuration parameter are a subset of the parameters related to frequency-domain monitoring in the first configuration parameter, including: the set of frequency-domain monitoring positions of the second search space set is a subset of the set of frequency-domain monitoring positions of the first search space set.

[0286] Embodiment 15. A communication device, wherein the communication device includes: a communication module and a processing module. The communication module is configured to receive search space information configured by a network device, and the search space information includes information on a first search space set and a second search space set. The processing module is configured to, when the terminal monitors the PDCCH according to the second search space set, if the terminal receives downlink control information DCI for data scheduling, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0287] Embodiment 16. The communication device according to Embodiment 15, wherein the downlink control information DCI for data scheduling includes DCI scrambled with any one of the following radio network temporary identifiers RNTI:

[0288] Cell radio network temporary identifier C-RNTI, modulation and coding strategy radio network temporary identifier MCS-C-RNTI, or configured scheduling radio network temporary identifier CS-RNTI.

[0289] Embodiment 17. The communication device according to Embodiment 16, wherein the downlink control information DCI for data scheduling is DCI within a user equipment specific search space UESS or DCI within a third type of common search space CSS type 3.

[0290] Embodiment 18. The communication device according to any one of Embodiments 15-17, wherein the first search space set has first configuration parameters, and the second search space set has second configuration parameters; the parameters related to time-domain monitoring in the second configuration parameters are a subset of the parameters related to time-domain monitoring in the first configuration parameters; and / or, the parameters related to frequency-domain monitoring in the second configuration parameters are a subset of the parameters related to frequency-domain monitoring in the first configuration parameters.

[0291] Embodiment 19. The communication device according to Embodiment 18, wherein the parameters related to time-domain monitoring in the first configuration parameters include the monitoring period of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameters include the monitoring period of the second search space set.

[0292] Correspondingly, the parameters related to time-domain monitoring in the second configuration parameters are a subset of the parameters related to time-domain monitoring in the first configuration parameters, including: the monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

[0293] Embodiment 20. The communication device according to Embodiment 18, wherein the parameters related to time-domain monitoring in the first configuration parameters include the set of monitoring symbols of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameters include the set of monitoring symbols of the second search space set.

[0294] Correspondingly, the parameters related to time-domain monitoring in the second configuration parameters are a subset of the parameters related to time-domain monitoring in the first configuration parameters, including: the set of monitoring symbols of the second search space set is a subset of the set of monitoring symbols of the first search space set.

[0295] Embodiment 21. The communication device according to Embodiment 18, wherein the parameters related to frequency-domain monitoring in the first configuration parameters include the set of frequency-domain monitoring positions of the first search space set, and the parameters related to frequency-domain monitoring in the second configuration parameters include the set of frequency-domain monitoring positions of the second search space set.

[0296] Correspondingly, the parameters related to frequency-domain monitoring in the second configuration parameters are a subset of the parameters related to frequency-domain monitoring in the first configuration parameters, including: the set of frequency-domain monitoring positions of the second search space set is a subset of the set of frequency-domain monitoring positions of the first search space set.

[0297] Embodiment 22. A method for monitoring a physical downlink control channel PDCCH, wherein the method is applied to a terminal, and the method includes:

[0298] The terminal receives the search space information configured by the network device, and the search space information includes the information of the first search space set and the second search space set;

[0299] When the terminal monitors the PDCCH according to the second search space set, if the terminal sends a first signal to the network device, after sending the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set. The first signal includes at least one of the following signals or channels: random access preamble code, scheduling request (SR), hybrid automatic repeat request negative acknowledgment (NACK), and / or physical uplink shared channel (PUSCH).

[0300] Embodiment 23. The method according to Embodiment 22, wherein after sending the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set, including:

[0301] In the next time slot after sending the preamble code, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set.

[0302] Embodiment 24. The method according to Embodiment 22, wherein after sending the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set, including:

[0303] The terminal receives DCI scrambled with a random access radio network temporary identity (RA-RNTI);

[0304] If the preamble code is used for non-competitive access, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set.

[0305] Embodiment 25. The method according to Embodiment 22, wherein after sending the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set, including:

[0306] The terminal receives a random access response (RAR) returned by the network device for the first signal;

[0307] If the preamble code is used for non-competitive access, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set.

[0308] Embodiment 26. The method according to Embodiment 24 or Embodiment 25, wherein the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set, including:

[0309] After a preset number of time units after the terminal receives the DCI scrambled with the RA-RNTI, or, after a preset number of time units after the terminal receives the random access response RAR returned by the network device for the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set.

[0310] Example 27. The method according to Example 26, wherein the time unit includes any one of the following: an orthogonal frequency division multiplexing OFDM symbol, a time slot, or a millisecond.

[0311] Example 28. The method according to Example 26, wherein after a preset number of time units after the terminal receives the DCI scrambled with the RA-RNTI, or, after a preset number of time units after the terminal receives the random access response RAR returned by the network device for the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set, including:

[0312] In the first time slot after a preset number of time units after the terminal receives the DCI scrambled with the RA-RNTI, or, in the first time slot after a preset number of time units after the terminal receives the random access response RAR returned by the network device for the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set.

[0313] Example 29. The method according to Example 22, wherein after sending the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set, including:

[0314] After receiving the random access response RAR returned by the network device for the first signal, the terminal sends a second signal to the network device;

[0315] If the preamble code is used for contention access and the second signal includes a C-RNTI MAC control element, then after sending the second signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set.

[0316] Example 30. The method according to Example 29, wherein if the preamble code is used for contention access and the second signal includes a C-RNTI MAC control element, then after sending the second signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set, including:

[0317] After sending the second signal, when the random access contention resolution timer is running, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set.

[0318] Example 31. The method according to Example 22, wherein the terminal is configured with a retransmission timer. After sending the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set, including:

[0319] When the retransmission timer is running, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set; wherein the retransmission timer includes a downlink retransmission timer for discontinuous reception or an uplink retransmission timer for discontinuous reception.

[0320] Example 32. The method according to any one of Examples 22-25 or Examples 27-31, wherein the first search space set has first configuration parameters, and the second search space set has second configuration parameters; the parameters related to time-domain monitoring in the second configuration parameters are a subset of the parameters related to time-domain monitoring in the first configuration parameters; and / or, the parameters related to frequency-domain monitoring in the second configuration parameters are a subset of the parameters related to frequency-domain monitoring in the first configuration parameters.

[0321] Example 33. The method according to Example 32, wherein the parameters related to time-domain monitoring in the first configuration parameters include the monitoring period of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameters include the monitoring period of the second search space set.

[0322] Correspondingly, the parameters related to time-domain monitoring in the second configuration parameters being a subset of the parameters related to time-domain monitoring in the first configuration parameters includes: the monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

[0323] Example 34. The method according to Example 22, wherein the parameters related to time-domain monitoring in the first configuration parameters include the monitoring symbol set of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameters include the monitoring symbol set of the second search space set.

[0324] Correspondingly, the parameters related to time-domain monitoring in the second configuration parameters being a subset of the parameters related to time-domain monitoring in the first configuration parameters includes: the monitoring symbol set of the second search space set is a subset of the monitoring symbol set of the first search space set.

[0325] Example 35. The method according to Example 34, wherein the parameters related to frequency-domain monitoring in the first configuration parameter include the set of frequency-domain monitoring positions of the first search space set, and the parameters related to frequency-domain monitoring in the second configuration parameter include the set of frequency-domain monitoring positions of the second search space set.

[0326] Correspondingly, the parameters related to frequency-domain monitoring in the second configuration parameter are a subset of the parameters related to frequency-domain monitoring in the first configuration parameter, including: the set of frequency-domain monitoring positions of the second search space set is a subset of the set of frequency-domain monitoring positions of the first search space set.

[0327] Example 36. A communication device, wherein the communication device can be a terminal, a chip in the terminal, or a system on a chip. The communication device includes: a processor and a memory. The memory stores instructions, and when the instructions are executed by the processor, the communication device is caused to perform the following steps: receiving search space information configured by a network device, where the search space information includes information on a first search space set and a second search space set; when the terminal monitors PDCCH according to the second search space set, if the terminal sends a first signal to the network device, after the terminal sends the first signal, stop monitoring PDCCH according to the second search space set, and start monitoring PDCCH according to the first search space set. The first signal includes at least one of the following signals or channels: a random access preamble code, a scheduling request (SR), a negative acknowledgment (NACK) of a hybrid automatic repeat request, and / or a physical uplink shared channel (PUSCH).

[0328] Example 37. The communication device according to Example 36, wherein when the instructions are executed by the processor, the communication device is further caused to perform the following steps: in the next time slot after the terminal sends the preamble code, stop monitoring PDCCH according to the second search space set, and start monitoring PDCCH according to the first search space set.

[0329] Example 38. The communication device according to Example 36, wherein when the instructions are executed by the processor, the communication device is further caused to perform the following steps: the terminal receives DCI scrambled with a random access radio network temporary identifier (RA-RNTI); if the preamble code is used for non-competitive access, stop monitoring PDCCH according to the second search space set, and start monitoring PDCCH according to the first search space set.

[0330] Example 39. The communication device according to Example 36, wherein when the instructions are executed by the processor, the communication device is further caused to perform the following steps: the terminal receives a random access response (RAR) returned by the network device for the first signal; if the preamble code is used for non-competitive access, stop monitoring PDCCH according to the second search space set, and start monitoring PDCCH according to the first search space set.

[0331] Embodiment 40. The communication device according to Embodiment 38 or Embodiment 39, wherein when the instruction is executed by the processor, the communication device is further caused to perform the following steps: after a preset number of time units after the terminal receives the DCI scrambled with the RA-RNTI, or, after a preset number of time units after the terminal receives the random access response RAR returned by the network device for the first signal, stop monitoring the PDCCH according to the second search space set, and start monitoring the PDCCH according to the first search space set.

[0332] Embodiment 41. The communication device according to Embodiment 40, wherein the time unit includes any one of the following: an orthogonal frequency division multiplexing OFDM symbol, a time slot, or a millisecond.

[0333] Embodiment 42. The communication device according to Embodiment 40, wherein when the instruction is executed by the processor, the communication device is further caused to perform the following steps: in the first time slot after a preset number of time units after the terminal receives the DCI scrambled with the RA-RNTI, or, in the first time slot after a preset number of time units after the terminal receives the random access response RAR returned by the network device for the first signal, stop monitoring the PDCCH according to the second search space set, and start monitoring the PDCCH according to the first search space set.

[0334] Embodiment 43. The communication device according to Embodiment 36, wherein when the instruction is executed by the processor, the communication device is further caused to perform the following steps: after the terminal receives the random access response RAR returned by the network device for the first signal, send a second signal to the network device; if the preamble code is used for contention access and the second signal includes a C-RNTI MAC control element, then after sending the second signal, stop monitoring the PDCCH according to the second search space set, and start monitoring the PDCCH according to the first search space set.

[0335] Embodiment 44. The communication device according to Embodiment 43, wherein when the instruction is executed by the processor, the communication device is further caused to perform the following steps: after the terminal sends the second signal, when the random access contention resolution timer is running, stop monitoring the PDCCH according to the second search space set, and start monitoring the PDCCH according to the first search space set.

[0336] Embodiment 45. The communication device according to Embodiment 36, wherein the terminal is configured with a retransmission timer, and when the instruction is executed by the processor, the communication device is further caused to perform the following steps: when the retransmission timer is running, stop monitoring the PDCCH according to the second search space set, and start monitoring the PDCCH according to the first search space set; wherein the retransmission timer includes a downlink retransmission timer for discontinuous reception or an uplink retransmission timer for discontinuous reception.

[0337] Example 46. The communication device according to any one of Examples 36 - 39 or Examples 41 - 45, wherein the first search space set has first configuration parameters, and the second search space set has second configuration parameters; the parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters; and / or, the parameters related to frequency domain monitoring in the second configuration parameters are a subset of the parameters related to frequency domain monitoring in the first configuration parameters.

[0338] Example 47. The communication device according to Example 46, wherein the parameters related to time domain monitoring in the first configuration parameters include the monitoring period of the first search space set, and the parameters related to time domain monitoring in the second configuration parameters include the monitoring period of the second search space set.

[0339] Correspondingly, the parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters, including: the monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

[0340] Example 48. The communication device according to Example 36, wherein the parameters related to time domain monitoring in the first configuration parameters include the monitoring symbol set of the first search space set, and the parameters related to time domain monitoring in the second configuration parameters include the monitoring symbol set of the second search space set.

[0341] Correspondingly, the parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters, including: the monitoring symbol set of the second search space set is a subset of the monitoring symbol set of the first search space set.

[0342] Example 49. The communication device according to Example 48, wherein the parameters related to frequency domain monitoring in the first configuration parameters include the frequency domain monitoring position set of the first search space set, and the parameters related to frequency domain monitoring in the second configuration parameters include the frequency domain monitoring position set of the second search space set.

[0343] Correspondingly, the parameters related to frequency domain monitoring in the second configuration parameters are a subset of the parameters related to frequency domain monitoring in the first configuration parameters, including: the frequency domain monitoring position set of the second search space set is a subset of the frequency domain monitoring position set of the first search space set.

[0344] Embodiment 50. A communication device, wherein the communication device includes: a communication module and a processing module. The communication module is configured to receive search space information configured by a network device, and the search space information includes information on a first search space set and a second search space set. The processing module is configured to, when the terminal monitors the PDCCH according to the second search space set, if the terminal sends a first signal to the network device, after sending the first signal, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set, where the first signal includes at least one of the following signals or channels: a random access preamble code, a scheduling request (SR), a negative acknowledgment (NACK) of a hybrid automatic repeat request, and / or a physical uplink shared channel (PUSCH).

[0345] Embodiment 51. The communication device according to Embodiment 50, wherein the processing module is further configured to, in the next time slot after the terminal sends the preamble code, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0346] Embodiment 52. The communication device according to Embodiment 50, wherein the processing module is further configured to, when the terminal receives DCI scrambled with a random access radio network temporary identifier (RA-RNTI); if the preamble code is used for non-competitive access, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0347] Embodiment 53. The communication device according to Embodiment 50, wherein the processing module is further configured to, when the terminal receives a random access response (RAR) returned by the network device for the first signal; if the preamble code is used for non-competitive access, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0348] Embodiment 54. The communication device according to Embodiment 52 or Embodiment 53, wherein the processing module is further configured to, after a preset number of time units after the terminal receives DCI scrambled with RA-RNTI, or, after a preset number of time units after the terminal receives a random access response (RAR) returned by the network device for the first signal, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0349] Embodiment 55. The communication device according to Embodiment 54, wherein the time unit includes any one of the following: an orthogonal frequency division multiplexing (OFDM) symbol, a time slot, or a millisecond.

[0350] Embodiment 56. The communication device according to Embodiment 54, wherein the processing module is further configured to stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set in the first time slot after a preset number of time units after the terminal receives the DCI scrambled with the RA-RNTI, or in the first time slot after a preset number of time units after the terminal receives the random access response RAR returned by the network device for the first signal.

[0351] Embodiment 57. The communication device according to Embodiment 50, wherein the processing module is further configured to send a second signal to the network device after the terminal receives the random access response RAR returned by the network device for the first signal; if the preamble code is used for contention access and the second signal includes a C-RNTI MAC control element, then after sending the second signal, stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set.

[0352] Embodiment 58. The communication device according to Embodiment 57, wherein the processing module is further configured to stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set when the random access contention resolution timer is running after the terminal sends the second signal.

[0353] Embodiment 59. The communication device according to Embodiment 50, wherein the terminal is configured with a retransmission timer, and the processing module is further configured to stop monitoring the PDCCH according to the second search space set and start monitoring the PDCCH according to the first search space set when the retransmission timer is running; wherein the retransmission timer includes a discontinuous reception downlink retransmission timer or a discontinuous reception uplink retransmission timer.

[0354] Embodiment 60. The communication device according to any one of Embodiments 50-53 or Embodiments 55-59, wherein the first search space set has first configuration parameters, and the second search space set has second configuration parameters; the parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters; and / or, the parameters related to frequency domain monitoring in the second configuration parameters are a subset of the parameters related to frequency domain monitoring in the first configuration parameters.

[0355] Embodiment 61. The communication device according to Embodiment 60, wherein the parameters related to time domain monitoring in the first configuration parameters include the monitoring period of the first search space set, and the parameters related to time domain monitoring in the second configuration parameters include the monitoring period of the second search space set.

[0356] Correspondingly, the parameters related to time-domain monitoring in the second configuration parameter are a subset of the parameters related to time-domain monitoring in the first configuration parameter, including: the monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

[0357] Embodiment 62. The communication device according to Embodiment 50, wherein the parameters related to time-domain monitoring in the first configuration parameter include the monitoring symbol set of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameter include the monitoring symbol set of the second search space set.

[0358] Correspondingly, the parameters related to time-domain monitoring in the second configuration parameter are a subset of the parameters related to time-domain monitoring in the first configuration parameter, including: the monitoring symbol set of the second search space set is a subset of the monitoring symbol set of the first search space set.

[0359] Embodiment 63. The communication device according to Embodiment 62, wherein the parameters related to frequency-domain monitoring in the first configuration parameter include the frequency-domain monitoring position set of the first search space set, and the parameters related to frequency-domain monitoring in the second configuration parameter include the frequency-domain monitoring position set of the second search space set.

[0360] Correspondingly, the parameters related to frequency-domain monitoring in the second configuration parameter are a subset of the parameters related to frequency-domain monitoring in the first configuration parameter, including: the frequency-domain monitoring position set of the second search space set is a subset of the frequency-domain monitoring position set of the first search space set.

[0361] Embodiment 64. A terminal includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the physical downlink control channel PDCCH monitoring method according to any one of Embodiments 1-7, 22-35.

[0362] Embodiment 65. A computer program product, when running on a computer, enables the computer to execute the physical downlink control channel PDCCH monitoring method according to any one of Embodiments 1-7, 22-35.

[0363] Embodiment 66. A computer-readable storage medium stores instructions. When running on a computer, the instructions enable the computer to execute the physical downlink control channel PDCCH monitoring method according to any one of Embodiments 1-7, 22-35.

[0364] Embodiment 67. A chip includes a processor. When the processor executes an instruction, the processor is configured to execute the physical downlink control channel (PDCCH) monitoring method according to any one of Embodiments 1-7 and Embodiments 22-35 described above. The instruction may come from a memory inside the chip or a memory outside the chip. Optionally, the chip further includes an input / output circuit.

[0365] Embodiment 68. A communication system includes a network device and a terminal as described in Embodiment 64.

[0366] Finally, it should be noted that the above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for monitoring a Physical Downlink Control Channel (PDCCH), characterized in that, The method is applied to a terminal, and the method includes: The terminal receives search space information configured by a network device, where the search space information includes information on a first search space set and a second search space set; When the terminal monitors PDCCH according to the second search space set, if the terminal receives downlink control information DCI for data scheduling, the terminal stops monitoring PDCCH according to the second search space set and starts monitoring PDCCH according to the first search space set; The downlink control information DCI for data scheduling includes DCI scrambled with any one of the following radio network temporary identifiers RNTIs: Cell radio network temporary identifier C-RNTI, modulation and coding scheme radio network temporary identifier MCS-C-RNTI, or configured scheduling radio network temporary identifier CS-RNTI.

2. The method according to claim 1, characterized in that The downlink control information DCI for data scheduling is DCI within a user equipment specific search space UESS or DCI within a third type of common search space CSS type 3.

3. The method according to claim 1 or 2, characterized in that The first search space set has first configuration parameters, and the second search space set has second configuration parameters; The parameters related to time domain monitoring in the second configuration parameters are a subset of the parameters related to time domain monitoring in the first configuration parameters; And / or The parameters related to frequency domain monitoring in the second configuration parameters are a subset of the parameters related to frequency domain monitoring in the first configuration parameters.

4. The method according to claim 3, characterized in that, The parameters related to time domain monitoring in the first configuration parameters include the monitoring period of the first search space set, and the parameters related to time domain monitoring in the second configuration parameters include the monitoring period of the second search space set; Correspondingly, the parameters related to time domain monitoring in the second configuration parameters being a subset of the parameters related to time domain monitoring in the first configuration parameters include: The monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

5. The method according to claim 3, wherein The parameters related to time domain monitoring in the first configuration parameters include the monitoring symbol set of the first search space set, and the parameters related to time domain monitoring in the second configuration parameters include the monitoring symbol set of the second search space set; Correspondingly, the parameters related to time domain monitoring in the second configuration parameters being a subset of the parameters related to time domain monitoring in the first configuration parameters include: The monitoring symbol set of the second search space set is a subset of the monitoring symbol set of the first search space set.

6. The method according to claim 3, wherein The parameters related to frequency domain monitoring in the first configuration parameters include the frequency domain monitoring position set of the first search space set, and the parameters related to frequency domain monitoring in the second configuration parameters include the frequency domain monitoring position set of the second search space set; Correspondingly, the parameters related to frequency domain monitoring in the second configuration parameters being a subset of the parameters related to frequency domain monitoring in the first configuration parameters include: The frequency domain monitoring position set of the second search space set is a subset of the frequency domain monitoring position set of the first search space set.

7. A method for monitoring a Physical Downlink Control Channel (PDCCH), characterized in that, The method is applied to a terminal, and the method includes: The terminal receives the search space information configured by the network device, where the search space information includes information on a first search space set and a second search space set; When the terminal monitors the PDCCH according to the second search space set, if the terminal sends a first signal to the network device, after sending the first signal, the terminal stops monitoring the PDCCH according to the second search space set and starts monitoring the PDCCH according to the first search space set, and the first signal includes a scheduling request (SR).

8. The method according to claim 7, wherein The first search space set has first configuration parameters, and the second search space set has second configuration parameters; The parameters related to time-domain monitoring in the second configuration parameters are a subset of the parameters related to time-domain monitoring in the first configuration parameters; and / or The parameters related to frequency-domain monitoring in the second configuration parameters are a subset of the parameters related to frequency-domain monitoring in the first configuration parameters.

9. The method according to claim 8, wherein The parameters related to time-domain monitoring in the first configuration parameters include the monitoring period of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameters include the monitoring period of the second search space set; Correspondingly, the parameters related to time-domain monitoring in the second configuration parameters being a subset of the parameters related to time-domain monitoring in the first configuration parameters include: The monitoring period of the second search space set is an integer multiple of the monitoring period of the first search space set.

10. The method according to claim 8, wherein The parameters related to time-domain monitoring in the first configuration parameters include the monitoring symbol set of the first search space set, and the parameters related to time-domain monitoring in the second configuration parameters include the monitoring symbol set of the second search space set; Correspondingly, the parameters related to time-domain monitoring in the second configuration parameters being a subset of the parameters related to time-domain monitoring in the first configuration parameters include: The monitoring symbol set of the second search space set is a subset of the monitoring symbol set of the first search space set.

11. The method according to claim 10, characterized in that, The parameters related to frequency-domain monitoring in the first configuration parameters include the frequency-domain monitoring position set of the first search space set, and the parameters related to frequency-domain monitoring in the second configuration parameters include the frequency-domain monitoring position set of the second search space set; Correspondingly, the parameters related to frequency-domain monitoring in the second configuration parameters being a subset of the parameters related to frequency-domain monitoring in the first configuration parameters include: The frequency-domain monitoring position set of the second search space set is a subset of the frequency-domain monitoring position set of the first search space set.

12. A terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for monitoring a physical downlink control channel (PDCCH) according to any one of claims 1-11.

13. A chip, characterized in that, The chip includes a processor, the processor is coupled to a memory, and the processor executes a computer program stored in the memory to implement the method for monitoring a physical downlink control channel (PDCCH) according to any one of claims 1-11.

14. A communication system, characterized in that, It includes a network device and a terminal according to claim 12.

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