Transmission method and device of control channel, equipment and storage medium

Abstract

Disclosed are a control channel transmission method, apparatus and device, and a storage medium, belonging to the technical field of communications, the control channel transmission method of the embodiment of the present application comprising: a terminal obtaining configuration information of M frequency domain units, M being less than or equal to the number P of frequency domain units configured by a serving cell of the terminal, and obtaining the frequency domain resources of the CORESET on the M frequency domain units, and determining at least one CORESET for receiving the PDCCH according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET. By configuring the CORESET on a part of frequency domain units of a serving cell of the terminal, the public signaling overhead can be reduced, the load balance of each uplink UL / DL carrier can be achieved, and the terminal combines all or part of CORESET on M frequency domain units across the frequency domain units to obtain the CORESET for receiving the PDCCH, so that the CORESET for receiving the PDCCH has larger bandwidth, the PDCCH conflict probability is reduced, and the user experience is improved. The coverage capability and the transmission reliability of the PDCCH are improved, and the network flexibility is improved.

Description

Technical Field

[0001] This application belongs to the field of wireless communication technologies, and particularly relates to a method, apparatus, device, and storage medium for transmitting a control channel. Background Art

[0002] The spectrum resources of a new radio (NR) system include the Sub-6GHz band. Among them, the band below 3GHz is called Sub-3GHz, and the remaining bands are called C-band. The Sub-3GHz band is fragmented and allocated to mobile operators. The spectrum resources owned by mobile operators are relatively scattered, that is, the bandwidth of the spectrum resources is narrow and the spectrum is discontinuous. How to efficiently and flexibly utilize these scattered and narrow-bandwidth spectrum resources to provide large-capacity and large-bandwidth services to users is one of the problems that the NR system needs to solve. Summary of the Invention

[0003] Embodiments of this application provide a method, apparatus, device, and storage medium for transmitting a control channel, which can utilize scattered and narrow-bandwidth spectrum resources to provide large-capacity and large-bandwidth services to users.

[0004] In a first aspect, a method for transmitting a control channel is provided, which is executed by a terminal. The method includes: the terminal obtains configuration information of M frequency domain units, where M is less than or equal to the number P of frequency domain units configured for the serving cell of the terminal; the terminal obtains the frequency domain resources of a control resource set (CORESET) on the M frequency domain units; the terminal determines at least one CORESET for receiving a physical downlink control channel (PDCCH) according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET.

[0005] In a second aspect, a method for transmitting a control channel is provided, which is executed by a network-side device. The method includes: the network-side device sends configuration information of M frequency domain units to the terminal, where M is less than or equal to the number P of frequency domain units configured for the serving cell of the terminal; the network-side device sends the frequency domain resources of the CORESET on the M frequency domain units to the terminal; the network-side device sends a downlink control channel (PDCCH) on at least one CORESET according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET.

[0006] In a third aspect, a transmission device for a control channel is provided, including: an acquisition module configured to acquire configuration information of M frequency-domain units, where M is less than or equal to the number P of frequency-domain units configured for a serving cell of a terminal; the acquisition module is further configured to acquire frequency-domain resources of a CORESET on the M frequency-domain units; a determination module configured to determine at least one CORESET for receiving a PDCCH according to the configuration information of the M frequency-domain units and the frequency-domain resources of the CORESET.

[0007] In a fourth aspect, a transmission device for a control channel is provided, including: a transmission module configured to transmit configuration information of M frequency-domain units to a terminal, where M is less than or equal to the number P of frequency-domain units configured for the serving cell of the terminal; the transmission module is configured to transmit frequency-domain resources of a CORESET on the M frequency-domain units to the terminal; a processing module configured to transmit a PDCCH on at least one CORESET according to the configuration information of the M frequency-domain units and the frequency-domain resources of the CORESET.

[0008] In a fifth aspect, a terminal is provided, which includes a processor and a memory. The memory stores a program or instruction that can run on the processor. When the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0009] In a sixth aspect, a terminal is provided, including a processor and a communication interface. The processor is configured to acquire configuration information of M frequency-domain units, where M is less than or equal to the number P of frequency-domain units configured for the serving cell of the terminal, and acquire frequency-domain resources of a CORESET on the M frequency-domain units; determine at least one CORESET for receiving a physical downlink control channel (PDCCH) according to the configuration information of the M frequency-domain units and the frequency-domain resources of the CORESET, and the communication interface is configured to receive a PDCCH on the at least one CORESET.

[0010] In a seventh aspect, a network-side device is provided, which includes a processor and a memory. The memory stores a program or instruction that can run on the processor. When the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0011] In an eighth aspect, a network-side device is provided, including a processor and a communication interface. The processor is configured to determine at least one CORESET for transmitting PDCCH according to the configuration information of M frequency-domain units and the frequency-domain resources of the CORESET, where M is less than or equal to the number P of frequency-domain units configured for the serving cell of the terminal. The communication interface is configured to send the configuration information of the M frequency-domain units to the terminal, send the frequency-domain resources of the CORESET on the M frequency-domain units to the terminal, and send PDCCH to the terminal through the at least one CORESET.

[0012] In a ninth aspect, a readable storage medium is provided. Programs or instructions are stored on the readable storage medium. When the programs or instructions are executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0013] In a tenth aspect, a wireless communication system is provided, including: a terminal and a network-side device. The terminal can be configured to execute the steps of the method described in the first aspect, and the network-side device can be configured to execute the steps of the method described in the second aspect.

[0014] In an eleventh aspect, a chip is provided. The chip includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is configured to run programs or instructions to implement the method described in the first aspect, or implement the method described in the second aspect.

[0015] In a twelfth aspect, a computer program / program product is provided. The computer program / program product is stored in a storage medium. The program / program product is executed by at least one processor to implement the steps of the method for transmitting a control channel described in the first aspect or the second aspect.

[0016] In the embodiments of the present application, the network-side device can reduce the common signaling overhead and achieve the load balance of each uplink / downlink carrier by configuring CORESET on some frequency-domain units of the serving cell of the terminal. The terminal combines all or part of the CORESETs on the M frequency-domain units across the frequency-domain units to obtain the CORESET for receiving PDCCH, so that the CORESET for receiving PDCCH has a larger bandwidth, reduces the PDCCH collision probability, increases the PDCCH coverage ability and transmission reliability, and increases the network flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A block diagram of a wireless communication system to which the embodiments of the present application can be applied is shown;

[0018] Figure 2It is a flowchart of the control channel transmission method provided in the first embodiment of the present application;

[0019] Figure 3 It is a schematic diagram of the position of the starting RB of the BWP relative to the frequency-domain starting point of the carrier where the BWP is located;

[0020] Figure 4 It is a schematic diagram of the frequency reference points of each frequency-domain unit of the terminal;

[0021] Figure 5 It is a schematic diagram of configuring a CORESET for all the frequency-domain units of the serving cell of the terminal;

[0022] Figure 6 It is a schematic diagram of configuring a CORESET for some of the frequency-domain units of the serving cell of the terminal;

[0023] Figure 7 It is a flowchart of the control channel transmission method provided in the second embodiment of the present application;

[0024] Figure 8 It is a schematic diagram of a kind of cascade of the CORESETs of multiple frequency-domain units;

[0025] Figure 9 It is a schematic diagram of another kind of cascade of the CORESETs of multiple frequency-domain units;

[0026] Figure 10 It is a schematic diagram of another kind of cascade of the CORESETs of multiple frequency-domain units;

[0027] Figure 11 It is a schematic diagram of the cascade of the CORESETs of the frequency-domain units of multiple terminals;

[0028] Figure 12 It is a flowchart of the control channel transmission method provided in the third embodiment of the present application;

[0029] Figure 13 It is a schematic diagram of a kind of CORESET of the frequency-domain unit of the terminal;

[0030] Figure 14 It is a flowchart of the control channel transmission method provided in the fourth embodiment of the present application;

[0031] Figure 15 It is a signaling flowchart of a control channel transmission method provided in the fifth embodiment of the present application;

[0032] Figure 16 It is a schematic diagram of the structure of a control channel transmission device provided in the sixth embodiment of the present application;

[0033] Figure 17Schematic structural diagram of a transmission device for a control channel provided in Embodiment 7 of this application;

[0034] Figure 18 Schematic structural diagram of a communication device provided in an embodiment of this application;

[0035] Figure 19 Schematic hardware structure diagram of a terminal for implementing an embodiment of this application;

[0036] Figure 20 Schematic hardware structure diagram of a network - side device for implementing an embodiment of this application. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of this application will be clearly described with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of this application.

[0038] The terms "first", "second", etc. in this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first" and "second" are usually of the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "or" in this application means at least one of the connected objects. For example, "A or B" covers three scenarios, namely, Scenario 1: including A and not including B; Scenario 2: including B and not including A; Scenario 3: including both A and B. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0039] The term "indicate" in this application can be either a direct indication (or an explicit indication) or an indirect indication (or an implicit indication). Among them, a direct indication can be understood as that the sender clearly tells the receiver specific information, operations to be performed, or request results, etc. in the sent indication; an indirect indication can be understood as that the receiver determines the corresponding information according to the indication sent by the sender, or makes a judgment and determines the operations to be performed or request results, etc. according to the judgment result.

[0040] It should be noted that the technology described in the embodiments of this application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, and can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), or other systems. The terms "system" and "network" in the embodiments of this application are often used interchangeably, and the described technology can be used in the above-mentioned systems and radio technologies, as well as in other systems and radio technologies. The following description describes the NR system for example purposes and uses NR terms in most of the following descriptions, but these technologies can also be applied to systems other than the NR system, such as the 6th Generation (6 th Generation, 6G) communication system.

[0041] Figure 1Block diagram of a wireless communication system to which embodiments of the present application can be applied is shown. The wireless communication system includes a terminal 11 and a network-side device 12. Among them, the terminal 11 can be a mobile phone, a tablet personal computer, a laptop computer, a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device, a flight vehicle, a vehicle user equipment (VUE), a shipborne device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), a game console, a personal computer (PC), a teller machine or a self-service machine, etc. Wearable devices include: smart watches, smart bracelets, smart earphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart ankle chains, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle user equipment can also be referred to as a vehicle terminal, a vehicle controller, a vehicle module, a vehicle component, a vehicle chip or a vehicle unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network-side device 12 can include an access network device or a core network device. Among them, the access network device can also be referred to as a radio access network (RAN) device, a radio access network function or a radio access network unit. The access network device can include a base station, a wireless local area network (WLAN) access point (AP) or a wireless fidelity (WiFi) node, etc.Among them, the base station may be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), home Node B (HNB), home evolved Node B, Transmission Reception Point (TRP), or some other suitable term in the art. As long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiments of this application, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.

[0042] To better understand the embodiments of this application, the following content is introduced first:

[0043] (1) Physical Downlink Control Channel (PDCCH)

[0044] The PDCCH is a downlink control channel, and the downlink control information (DCI) of the Physical Uplink Shared Channel (PUSCH) and the Physical Downlink Share Channel (PDSCH) is carried on the PDCCH. In the LTE system, the PDCCH occupies the entire bandwidth in the frequency domain and the first 1 of each subframe in the time domain Three symbols. In the NR system, if the PDCCH continues to occupy the entire bandwidth in the LTE manner, it will cause waste of resources and impose high requirements on the terminal. Therefore, in the NR system, the frequency-domain resources of the PDCCH are located within the Bandwidth Part (BWP), and the time domain does not occupy fixed time slots. The time-frequency resources of the PDCCH in the NR system are mainly determined by the Control Resourceset (CORESET) and the Search Space.

[0045] (2) BWP

[0046] The BWP is a set of consecutive multiple Resource Blocks (RBs) within a carrier. In the NR system, the network side can dynamically configure the system bandwidth for the terminal to work according to different service types, which can save network resources while reducing the power consumption of the terminal.

[0047] Exemplarily, the technical advantages of the BWP mainly have four aspects:

[0048] 1. The terminal does not need to support the entire bandwidth, only needs to meet the minimum bandwidth requirement, which is beneficial to the development of low-cost terminals.

[0049] 2. When the traffic volume of the terminal is small, the terminal can switch to operate with a low bandwidth, which can significantly reduce the power consumption.

[0050] 3. It is backward compatible with 5G technology. When new technologies are added to 5G, the new technologies can be directly run on the new BWP, ensuring the forward compatibility of the system.

[0051] 4. It adapts to the service needs and dynamically configures the BWP for the service.

[0052] Exemplarily, the network side can dynamically adjust the bandwidth of the terminal according to the traffic volume. For example, at the first moment, the traffic volume of the terminal is large, and the network side configures a large bandwidth (BWP1) for the terminal; at the second moment, the traffic volume of the terminal is small, and the network side configures a small bandwidth (BWP2) for the terminal to meet the basic communication requirements; at the third moment, the network side finds that there is a large range of frequency-selective fading within the bandwidth where BWP1 is located, or the resources within the frequency range where BWP1 is located are relatively scarce, so it configures a new bandwidth (BWP3) for the terminal.

[0053] The frequencies and bandwidths of multiple BWPs configured by the network side for the terminal are different. Optionally, other configuration parameters of the multiple BWPs can also be different. For example, the subcarrier spacing (SCS), cyclic prefix (CP) type, synchronization signal / physical broadcast channel (SSB) period, etc. of each BWP can be configured differently. Among them, SSB includes a synchronization signal and a broadcast signal. The synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and the broadcast signal includes a physical broadcast channel (PBCH) data and a PBCH demodulation reference signal (DMRS) signal.

[0054] (3) CORESET

[0055] In the NR system, in order to improve resource utilization and reduce the blind detection complexity of the terminal, the concept of CORESET is introduced, so that the PDCCH no longer occupies the entire bandwidth.

[0056] CORESET is a set of physical resources used to carry the PDCCH or DCI. The parameters related to CORESET include:

[0057] A resource element (RE) consists of one subcarrier in the frequency domain and one orthogonal frequency-division multiplexing (OFDM) symbol in the time domain.

[0058] A resource block (RB) consists of 12 REs.

[0059] A resource element group (REG) consists of one RB (12 REs) in the frequency domain and one OFDM symbol in the time domain.

[0060] A resource element group set (REG Bundles) consists of multiple REGs. The number of them is determined by the radio resource control (RRC) parameter reg-bundle-size. The bundle size can be {2, 3, 6}, which is related to the number of CORESET symbols.

[0061] A control-channel element (CCE) consists of 6 REGs.

[0062] The aggregation level (AL) indicates how many CCEs are allocated for the PDCCH. The currently supported aggregation levels are {1, 2, 4, 8, 16}.

[0063] CORESET describes the frequency-domain characteristics of the PDCCH blind detection resources. The PDCCH blind detection resources also include time-domain characteristics. The frequency-domain characteristics of the PDCCH are described by the search space (SS), and the search space is used to describe the starting symbol, detection period, etc. of the PDCCH.

[0064] A CORESET can be composed of multiple PRBs in the frequency domain and 1 / 2 / 3 OFDM symbols in the time domain. The number and position of PRBs occupied by the CORESET can be flexibly deployed by the network side. Exemplarily, the CORESET has the following characteristics:

[0065] The PRBs occupied by the CORESET can be continuous or discontinuous;

[0066] A CORESET can occupy one or more consecutive symbols in the time domain, and the number of symbols can take values from {1, 2, 3};

[0067] When the CORESET occupies one symbol in the time domain, the REG bundle size can be {2, 6};

[0068] When the CORESET occupies 2 / 3 symbols in the time domain, the REG bundle size can be equal to the number of time-domain symbols or 6;

[0069] A terminal can be configured with one or more CORESETs, and each cell can have a maximum of 3 CORESETs per BWP;

[0070] A CORESET can be associated with two types of search spaces: the common search space and the UE-specific search space;

[0071] Each BWP can be configured with a maximum of 3 CORESETs;

[0072] Each BWP can be configured with a maximum of 10 search spaces;

[0073] Multiple CORESETs configured for a terminal can overlap in the frequency domain or time domain;

[0074] Within each CORESET, the mapping of CCEs to REGs can be interleaved or non-interleaved, but a CORESET can only have one mapping method.

[0075] Compared with the LTE / LTE-A system, the NR system aims for greater bandwidth and throughput. The NR system needs to use fragmented spectra below 3 GHz to provide users with large bandwidth and high capacity to meet the growing future ToBusiness (ToB) and ToCustomer (ToC) services. Cells that use these fragmented continuous or discontinuous spectra are called flexible serving cells, and the purpose of flexible serving cells is to efficiently and flexibly utilize these fragmented spectra.

[0076] The following, in conjunction with the accompanying drawings, through some embodiments and their application scenarios, details the transmission method of the control channel provided by the embodiments of the present application. The following embodiments can be combined with each other, and the same or similar concepts and processes may not be repeated in some embodiments.

[0077] Embodiment 1

[0078] Figure 2 is a flowchart of the transmission method of the control channel provided by Embodiment 1 of the present application, and this method is applied to a terminal. As Figure 2 shown, the method provided in this embodiment includes the following steps.

[0079] S101. The terminal obtains the configuration information of M frequency domain units, where M is less than or equal to the number P of frequency domain units configured by the serving cell of the terminal.

[0080] Optionally, the frequency domain unit can be a BWP, a carrier, or a band. A band can contain multiple carriers, and a carrier can contain multiple BWPs. It can be understood that the configuration information of different types of frequency domain units may be different.

[0081] Exemplarily, the configuration information of the M frequency domain units includes at least one of the following:

[0082] The frequency reference point of the M frequency domain units;

[0083] The frequency offset value (offset ToCarrier) of each of the M frequency domain units relative to the frequency reference point;

[0084] The SCS of each of the M frequency domain units;

[0085] CP of each of the M frequency-domain units;

[0086] Start RB and size of each of the M frequency-domain units;

[0087] Index (or identifier) of each of the M frequency-domain units.

[0088] Some or all of the configuration information of the M frequency-domain units can be configured by the network-side device and sent to the terminal. For the information not configured by the network-side device, the terminal can determine it according to other information.

[0089] It should be noted that for the P frequency-domain units configured for the serving cell, the configuration information of the above frequency-domain units is required so that the terminal can receive data, such as PDSCH or PUSCH. Since this application emphasizes the processing of CORESET, the P frequency-domain units are not specifically described.

[0090] In the NR system, the bandwidth of the frequency-domain unit of the terminal is not necessarily equal to the channel bandwidth. For example, the channel bandwidth is 100 MHz, and the bandwidth of the BWP allocated by the network side to the terminal is 20 MHz. If the terminal does not use the full bandwidth of the channel bandwidth, then the terminal needs to determine the starting frequency of the frequency-domain unit allocated to itself according to the frequency reference point.

[0091] In the NR system, the frequency reference point can be PointA, and Point A is the common reference point of the entire resource grid.

[0092] Optionally, the frequency reference points of the M frequency-domain units include at least one of the following:

[0093] Frequency reference point of the frequency-domain unit among the M frequency-domain units that has no associated cell-defining synchronization signal block (CD-SSB);

[0094] A common frequency reference point of the frequency-domain units among the M frequency-domain units that have no associated CD-SSB;

[0095] Frequency reference point of each of the M frequency-domain units;

[0096] A common frequency reference point of the M frequency-domain units.

[0097] In the embodiments of the present application, for the case where the frequency domain unit is a BWP, even if the CD-SSB is not within one BWP (initial BWP), the CD-SSB may be associated with this BWP. For the case where the frequency domain unit is a carrier / band, a similar definition can be adopted. Optionally, a carrier / band without an associated CD-SSB can be defined, which means there is no CD-SSB on this carrier / band.

[0098] Some of the M frequency domain units are associated with CD-SSBs, and some are not. Among them, for the frequency domain units associated with CD-SSBs, the frequency reference points of these frequency domain units can be determined according to some acquired parameters of these frequency domain units; for the frequency domain units not associated with CD-SSBs, the network side device can configure frequency reference points for these frequency domain units, where the frequency reference points of different frequency domain units can be different.

[0099] Taking the frequency domain unit as a BWP and the system adopting Time Division Duplexing (TDD) as an example, the network side device indicates or configures the frequency reference point (such as point A) for at least one frequency domain unit through the following method.

[0100] For the DL BWP associated with the CD-SSB, its frequency reference point does not need to be configured by the network side device and can be determined according to the lowest frequency domain position of the frequency where the SSB is located, the subcarrier offset k_ssb parameter, and offsetToPoint A. Exemplarily, it is calculated using the following formula:

[0101] The frequency reference point of point A = the lowest frequency domain position of the BWP associated with the SSB - k_ssb * u - offsetToPointA * 12 * u.

[0102] Among them, u is the subcarrier spacing, which is 15 kHz for FR1 and 60 kHz for FR2. The subcarrier offset k_ssb parameter and offsetToPoint A can be notified by the network side device in the Master Information Block (MIB) message.

[0103] For the DL BWP not associated with the CD-SSB, the network side device can configure a frequency domain reference point for each carrier, and the network side device can configure the frequency domain reference point for each carrier through the System Information Block (SIB) message.

[0104] When the frequency domain unit is a BWP, the network device configures the position of the starting RB and the size of the BWP for each BWP. Among them, the position of the starting RB refers to the starting RB relative to the frequency domain starting point of the carrier where the BWP is located. The frequency domain starting point of the carrier is provided by offsetToCarrier, which is an offset value relative to pointA, and this parameter is notified in the SIB.

[0105] Reference Figure 3 , Figure 3 is a schematic diagram of the position of the starting RB of the BWP relative to the frequency domain starting point of the carrier where the BWP is located. There are 3 BWPs in total in the figure: BWP i, BWP j, and BWP k. BWP i, BWP j, and BWP k are located on three different carriers: carrier p, carrier q, and carrier m. The positions of Point A of the carriers where the 3 BWPs are located in the figure are different, and the positions of the starting RBs of the 3 BWPs are and The sizes of the 3 BWPs can be expressed as and Among them, the subscripts i, j, and k are used to distinguish different BWPs.

[0106] Optionally, the frequency reference point of the frequency domain unit associated with the CD-SSB can be obtained according to the SSB, and the frequency reference points of other frequency domain units can be configured to be the same. Exemplarily, Figure 4 is a schematic diagram of the frequency reference points of each frequency domain unit of the terminal. Refer to Figure 4 , the frequency reference points of carrier q and carrier p are the same. Carrier m is the carrier where the CD-SSB is located, and the frequency reference point of carrier m is different from the frequency reference points of carrier p and carrier q. Optionally, the frequency reference point of the carrier where the CD-SSB is located can also be the same as the frequency reference points of other carriers.

[0107] S102. The terminal obtains the frequency domain resources of the CORESET on M frequency domain units.

[0108] The serving cell of the terminal is configured with P frequency domain units. Different from the prior art where it is necessary to configure the CORESET on each frequency domain unit, in this embodiment, the network device can configure the CORESET on all or part of the P frequency domain units. When M is equal to P, the network side configures the CORESET on all the frequency domain units of the serving cell. When M is less than P, the network side configures the CORESET on some of the frequency domain units of the serving cell.

[0109] Figure 5 is a schematic diagram of configuring the CORESET for all the frequency domain units of the serving cell of the terminal, Figure 6 is a schematic diagram of configuring the CORESET for some of the frequency domain units of the serving cell of the terminal. Refer to Figure 5 andFigure 6 The serving cell of the terminal is configured with three frequency domain units: frequency domain unit A, frequency domain unit B, and frequency domain unit C. These three frequency domain units can be BWPs, carriers, or frequency bands. Figure 5 CORESETs are configured for all three frequency domain units in Figure 6 CORESETs are configured for frequency domain units B and C in , and no CORESET is configured for frequency domain unit A.

[0110] It can be understood that Figure 5 and Figure 6 are only schematic diagrams and do not constitute limitations. The bandwidths of the respective frequency domain units can be the same or different, the number of CORESETs configured on the respective frequency domain units can be the same or different, and the multiple CORESETs within each frequency domain unit can overlap in the frequency domain or time domain.

[0111] By configuring CORESETs on some of the frequency domain units of the serving cell of the terminal, the common signaling overhead can be reduced, achieving load balancing for each uplink (UL) / downlink (DL) carrier.

[0112] The frequency domain resources of a CORESET can be continuous or discontinuous. Each CORESET has a CORESET identity (ID), and the CORESET ID uniquely identifies a CORESET among all BWPs in a serving cell.

[0113] The terminal can obtain the frequency domain resources of the CORESET on the frequency domain unit through the frequency Domain Resources parameter. For example, the frequency domain resources of the CORESET can be indicated in a 45-bit bitmap manner. Each bit can indicate one RB group (e.g., 6 PRBs). The value of each bit is 0 or 1. 1 indicates that the RB group corresponding to the bit is the frequency domain resource of the CORESET, and 0 indicates that the RB group corresponding to the bit is not the frequency domain resource of the CORESET.

[0114] The RB group corresponding to the first bit (i.e., the most significant bit, MBS) of the frequency Domain Resources field is the first RB group on the corresponding frequency domain unit, rather than the first RB group on the corresponding CORESET.

[0115] When the frequency domain unit is a BWP, the common RB sequence number of the first RB of the first RB group on the BWP is: Among them, the value of m is 6. Indicates the position of the starting RB of BWPi. Optionally, any one of the M frequency-domain units can be used to send downlink control information to improve flexibility. Exemplarily, Figure 5 and Figure 6 In the frequency-band units shown, the network-side device can send downlink control information only on the CORESET of frequency-domain unit C.

[0116] The downlink control information includes system information and paging information, etc. The system information includes SSB, System Information Block (SIB), Remaining Minimum System Information (RMSI), and Other System Information (OSI), etc. The downlink control information includes necessary information, such as the frequency of each carrier, SCS, Random Access Channel (RACH) resources, etc. Correspondingly, the terminal can receive the PDCCH of MSG2 during the random access process on a subset of the frequency-domain units (i.e., one frequency-domain unit).

[0117] S103. The terminal determines at least one CORESET for receiving the PDCCH according to the configuration information of the M frequency-domain units and the frequency-domain resources of the CORESET.

[0118] The method of the embodiments of this application can be used before or after the establishment of the RRC connection. For before the establishment of the RRC connection, the CORESET configuration information involved herein can be notified through the SIB. For after the establishment of the RRC connection, the CORESET configuration information involved herein can be notified through the RRC message.

[0119] One or more CORESETs can be configured on each frequency-domain unit. Assuming that a total of N1 CORESETs are configured on the M frequency-domain units, the value of N1 is greater than or equal to M, that is, the M frequency-domain units include at least M CORESETs. The terminal can combine all or part of the CORESETs on the M frequency-domain units across the frequency-domain units according to predefined rules or the indication of the network-side device to obtain the CORESET for receiving the PDCCH, so that the CORESET for receiving the PDCCH has a larger bandwidth.

[0120] CORESETs with larger bandwidths can support higher aggregation levels. For example, an aggregation level of AL 16 requires 96 RBs (i.e., 16 CCEs) to be occupied. Narrow-bandwidth carriers usually cannot carry CCEs with higher aggregation levels. The method of this embodiment combines CORESETs on multiple frequency-domain units across frequency-domain units, enabling the terminal to support higher aggregation levels, increasing the coverage ability of PDCCH. CORESETs with larger bandwidths can also reduce the collision probability of PDCCH and increase the transmission reliability of PDCCH.

[0121] In one implementation, the terminal determines the order of CORESETs on M frequency-domain units, and cascades at least one cascaded CORESET according to the order of CORESETs on M frequency-domain units. This cascaded CORESET is used to receive PDCCH.

[0122] In this method, CORESETs on M frequency-domain units can be cascaded across frequency-domain units to form one or more cascaded CORESETs. Each cascaded CORESET includes one or more CORESETs. The bandwidth of this cascaded CORESET is usually larger than that of the non-cascaded CORESET, so that PDCCH can be received on a larger bandwidth. It should be noted that if a frequency-domain unit is configured with multiple CORESETs, the network can instruct the terminal to cascade a subset of the CORESETs, that is, the CORESETs on a frequency-domain unit can partially participate in the cascade and can partially not participate in the cascade, depending on the flexible configuration of the network.

[0123] In this implementation, the network does not need to consider the capabilities of the terminal, that is, the network does not need to consider the capabilities of the terminal when configuring M frequency-domain units for the terminal device.

[0124] In this implementation, when M is less than P, that is, when CORESETs are only configured on M of the P frequency-domain units, the PDCCH carried or sent on this cascaded CORESET is used to schedule the data of these P frequency-domain units, or, it can be described that the control information in the PDCCH carried or sent on this cascaded CORESET is used to control the data transmission on these P frequency-domain units. Since CORESETs are only configured on some of the P frequency-domain units, the common signaling overhead can be reduced.

[0125] Before RRC connection establishment, the network can notify the CORESET configuration and the CORESET cascade configuration through SIB messages. The CORESET configuration includes the frequency-domain resources of the CORESET. The CORESET cascade configuration is used to instruct the terminal to perform cascading. The CORESET cascade configuration includes the information required for the terminal to perform cascading, including but not limited to the identifier of the cascaded CORESET and the index of the CORESET used for cascading.

[0126] After RRC connection establishment, the network notifies the CORESET configuration and the CORESET cascade configuration through RRC messages.

[0127] Optionally, if the network configures the CORESET for receiving SIB information, such as CORESET 0, then the CORESET configuration and the CORESET cascade configuration of each frequency-domain unit need to be determined according to the MIB message and predefined rules. CORESET0 usually only requires one configuration and is common to all terminals.

[0128] In another implementation, the M frequency-domain units are the frequency-domain units of the frequency-band combinations supported by the terminal. The terminal determines the CORESET of each of the M frequency-domain units for receiving the PDCCH. In this method, the CORESETs on different frequency-domain units can be cascaded or not cascaded. Compared with the prior art where the CORESET on each frequency-domain unit independently receives the PDCCH, the terminal can simultaneously use the CORESETs of multiple frequency-domain units that can perform frequency-band combination to receive the PDCCH, which is equivalent to increasing the bandwidth of the CORESET. It should be clear that the terminal in the embodiments of this application can be in any of the following states: idle state, INACTIVATE state, or RRC connected state.

[0129] In this implementation, the network needs to consider the capabilities of the terminal, that is, the network needs to consider the capabilities of the terminal when configuring the M frequency-domain units for the terminal device.

[0130] Among them, the frequency-domain units of the frequency-band combinations supported by the terminal can also be described as the frequency-domain units related to the frequency-band combination (bandcombination) capabilities of the terminal. The frequency-band combination is also called frequency-band merging. The frequency-band combination capability is used to indicate the number of frequency bands supported by the terminal simultaneously. A terminal may support one or more frequency bands simultaneously, and the frequency-band combination capabilities of different terminals are different. The frequency-domain units on all the frequency bands supported by the terminal constitute the frequency-domain units of the frequency-band combinations supported by the terminal. For example, if terminal 1 supports frequency band A and frequency band C, then the frequency-band combination supported by terminal 1 is frequency band A and frequency band C, and the frequency-domain units of the frequency-band combinations supported by terminal 1 are the frequency-domain units on the frequency bands A and C supported by terminal 1.

[0131] Before the RRC connection is established, the network does not obtain the UE capability information. The network can, according to prior information, such as the frequency band combinations supported by the frequency domain units of the serving cell, pre-indicate in the SIB the CORESET configuration and the CORESET cascading configuration corresponding to a certain frequency band combination capability. For example, if the serving cell supports different UE capabilities such as A, B, and C, the network can perform the CORESET configuration and the CORESET cascading configuration for at least one UE capability.

[0132] After the RRC connection is established, the network has obtained the UE capability information. The network can, according to the UE capability information and the frequency band combination capabilities supported by different UEs, configure in the RRC message the CORESET configuration and the CORESET cascading configuration corresponding to a certain UE type.

[0133] Optionally, if the network configures CORESET 0, then the CORESET configuration and the CORESET cascading configuration of each frequency domain unit need to be determined according to the MIB message and predefined rules. There may be multiple CORESET 0s, that is, equal to the number of frequency domain units of the frequency band combination indicated by the network, which is common for UEs supporting frequency domain unit aggregation.

[0134] When M frequency domain units are the frequency domain units of the frequency band combination supported by the UE, and in the case of CORESET cascading on different frequency domain units, according to the frequency band combination capability of the UE, it can be known that the UE usually only supports some frequency bands, that is, the UE only supports the frequency domain units on some frequency bands. Therefore, M is usually less than P. When M is less than P, the PDCCH carried or transmitted on this cascaded CORESET is used to schedule the data of these M frequency domain units. Or, it can be described that the control information in the PDCCH carried or transmitted on this cascaded CORESET is used to control the data transmission on these M frequency domain units. Without loss of generality, the network can also configure the CORESET of Q frequency domain units, where Q is less than or equal to M. The CORESET of these Q frequency domain units or the cascaded CORESET formed by cascading these Q frequency domain units can schedule the data of M frequency domain units.

[0135] In this embodiment, the terminal obtains the configuration information of M frequency-domain unit combinations according to the terminal capabilities, where M is less than or equal to the number P of frequency-domain units configured for the serving cell of the terminal, obtains the frequency-domain resources of the CORESET on the M frequency-domain unit combinations, and determines at least one CORESET for receiving the PDCCH according to the configuration information of the M frequency-domain unit combinations and the frequency-domain resources of the CORESET. By configuring the CORESET on some of the frequency-domain units of the serving cell of the terminal, the terminal capabilities can be matched, the common signaling overhead can be reduced, and the load balance of each uplink / downlink carrier can be achieved. The CORESET for receiving the PDCCH can be obtained by cascading all or part of the CORESETs on the M frequency-domain unit combinations across the frequency-domain unit combinations, so that the CORESET for receiving the PDCCH has a larger bandwidth, reducing the PDCCH collision probability, increasing the PDCCH coverage ability and transmission reliability, and increasing the network flexibility.

[0136] Embodiment 2

[0137] Based on Embodiment 1, Embodiment 2 of this application provides a method for transmitting a control channel. The implementation manners described in Embodiment 1 can all be applied to Embodiment 2 and can achieve the same technical effects. This embodiment is described by taking the cascading of the CORESETs of M frequency-domain units by the terminal as an example. Figure 7 It is a flowchart of the method for transmitting a control channel provided in Embodiment 2 of this application. As Figure 7 shown, the method provided in this embodiment includes the following steps.

[0138] S201. The terminal obtains the configuration information of M frequency-domain units, where M is less than or equal to the number P of frequency-domain units configured for the serving cell of the terminal.

[0139] In one implementation manner, the M frequency-domain units may be any M frequency-domain units in the serving cell of the terminal, that is, the M frequency-domain units are frequency-domain units that are not related to the frequency-band combination capabilities of the terminal.

[0140] In another implementation manner, the M frequency-domain units are the frequency-domain units of the frequency-band combination supported by the terminal.

[0141] The frequency band combination ability is a concept introduced in the Carrier Aggregation (CA) technology. The frequency band combination ability is used to indicate the number of frequency bands that a terminal supports simultaneously. A terminal may support one or more frequency bands simultaneously, and different terminals have different frequency band combination abilities. For example, if terminal 1 only supports frequency band A and frequency band C, then the frequency band combinations supported by terminal 1 are frequency band A and frequency band C; if terminal 2 only supports frequency band B and frequency band C, then the frequency band combinations supported by terminal 2 are frequency band B and frequency band C; if terminal 3 only supports frequency band C, then the frequency band combination supported by terminal 3 is frequency band C. Correspondingly, the network-side device can configure the frequency domain units for cascading according to the frequency band combination ability of the terminal, that is, the network-side device configures the CORESET only on the frequency domain units of the frequency bands supported by the terminal, and does not configure the frequency domain units and CORESET on the frequency bands not supported by the terminal. Correspondingly, the terminal device only cascades the CORESET on the frequency bands it supports.

[0142] S202. The terminal obtains the frequency domain resources of the CORESET on M frequency domain units.

[0143] S203. The terminal determines the order of the CORESET on M frequency domain units.

[0144] In the first implementation manner, the terminal sorts the CORESET on M frequency domain units in ascending or descending order according to the starting frequency of the CORESET on M frequency domain units, and cascades them according to the predefined cascading rules or according to the network indication.

[0145] In the second implementation manner, the terminal sorts the CORESET on M frequency domain units in ascending or descending order according to the starting frequency of M frequency domain units, and cascades them according to the predefined cascading rules according to the network indication.

[0146] S204. The terminal cascades to form at least one cascaded CORESET according to the order of the CORESET on M frequency domain units, and this cascaded CORESET is used to receive the PDCCH.

[0147] When these M frequency domain units are any M frequency domain units in the serving cell of the terminal, or these M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal, the following two methods can be used to cascade the CORESET of M frequency domain units.

[0148] In the first implementation manner, the terminal cascades to form at least one cascaded CORESET according to the order of the CORESET on M frequency domain units and the predefined cascading rules.

[0149] The predefined cascading rule can be sent by the network-side device to the terminal, or can be pre-agreed by the network-side device and the terminal.

[0150] Exemplarily, the predefined cascading rule can be: cascading all the CORESETs configured on the network side to form a cascaded CORESET. Then, the terminal cascades the CORESETs on M frequency-domain units to form a cascaded CORESET according to the predefined rule and the order of the CORESETs on the M frequency-domain units.

[0151] Since the CCEs within the cascaded CORESET need to be sorted, the terminal sorts the CORESETs on the M frequency-domain units, and the order of the CORESETs on the M frequency-domain units can represent the order of the CCEs within the cascaded CORESET.

[0152] Figure 8 For a cascading schematic diagram of the CORESETs of multiple frequency-domain units, refer to Figure 8 , Figure 8 Taking the frequency-domain unit as the BWP as an example, the serving cell of the terminal is configured with three BWPs: BWP i, BWP j, and BWP k. BWP i is on carrier p of frequency band A, BWP j is on carrier q of frequency band B, and BWP k is on carrier m of frequency band C. Each BWP is configured with a CORESET. After the terminal sorts the CORESETs of the three BWPs and cascades them to form a cascaded CORESET m, the CCE numbers within the cascaded CORESET m are 0 - 5, and the order of the CCE numbers within the cascaded CORESET m corresponds to the starting frequency order of the three BWPs, or the starting frequency order of the CORESETs within the three BWPs.

[0153] Figure 9 For another cascading schematic diagram of the CORESETs of multiple frequency-domain units, Figure 9 different from Figure 8 in that: Figure 9 CORESET is not configured for BWPi in [[ ]], that is, the network-side device only configures CORESET for some of the BWPs in the BWPs configured for the serving cell of the terminal, rather than configuring CORESET for all BWPs. Figure 9 The CCE numbers within the cascaded CORESET m in [[ ]] are 0 - 4.

[0154] Exemplarily, the predefined cascading rule can also be: selecting a CORESET with the same CORESET serial number from each frequency-domain unit and cascading them to form a cascaded CORESET.

[0155] Refer to Figure 10 , Figure 10Another cascading schematic diagram of the CORESET for multiple frequency domain units. In this method, the terminal first sorts the three BWPs according to the starting frequencies of the three BWPs. When cascading, according to the CORESET numbers from small to large or from large to small, one CORESET with the same number is selected from the three BWPs each time for cascading to form a cascaded CORESET.

[0156] For example, when cascading the CORESET numbered 1 first, the terminal selects the CORESET numbered 1 from BWP i, BWP j, and BWP k respectively: CORESET i_1, CORESET j_1, and CORESET k_1. CORESET i_1, CORESET j_1, and CORESET k_1 are cascaded to form the cascaded CORESET A. Then, the terminal selects the CORESET numbered 2 from BWP i, BWP j, and BWP k respectively: CORESET j_2 and CORESET k_2. CORESET j_2 and CORESET k_2 are cascaded to form the cascaded CORESET B. In this process, there is no CORESET numbered 2 in BWP i, so the CORESET of BWP i does not need to be cascaded. Finally, the terminal selects the CORESET numbered 3 from BWP i, BWP j, and BWP k respectively: CORESET k_3. CORESET k_3 is cascaded to form the cascaded CORESET C. In this process, there is no CORESET numbered 3 in BWP i and BWP j. So the cascaded CORESET C is just CORESET k_3. At this time, it is equivalent to not cascading.

[0157] In the second implementation method, the terminal cascades to form at least one cascaded CORESET according to the order of the CORESETs on the M frequency domain units and the cascading indication information sent by the network side device. The cascading indication information includes the identifier of the cascaded CORESET and the indexes of the CORESETs participating in the cascading among the M frequency domain units.

[0158] Optionally, the network side device can send the cascading indication information and the configuration information of the M frequency domain units to the terminal together, or can send the cascading indication information and the configuration information of the M frequency domain units to the terminal separately through different messages.

[0159] Take Figure 8 and 9 The shown cascading schematic diagram as an example. The cascading indication information includes an identifier of a cascaded CORESET: cascaded CORESET m, and the indexes of each CORESET participating in the cascading.

[0160] Take Figure 10Taking the cascading schematic diagram shown as an example, the cascading indication information includes three cascading CORESET identifiers: cascading CORESET A, cascading CORESET B, and cascading CORESET C, as well as the indexes of the CORESETs participating in the cascading corresponding to each cascading CORESET identifier. Exemplarily, the indexes of the CORESETs participating in the cascading corresponding to cascading CORESET A are: CORESETi_1, CORESET j_1, and CORESET k_1.

[0161] When the M frequency-domain units are the frequency-domain units of the frequency-band combination supported by the terminal, before cascading, the terminal needs to notify the network side of the frequency bands it supports, and then, according to the frequency bands it supports, send or receive on the frequency-domain units within the frequency bands it supports. Alternatively, the network side directly notifies the configurations corresponding to at least one capability level of terminals according to the candidate terminal capability levels. In one way, the terminal can determine the frequency bands it supports according to its own frequency-band combination capability, for example, before the establishment of the RRC connection. In another way, the network-side device indicates to the terminal the configurations corresponding to the frequency bands supported by the terminal, for example, after the establishment of the RRC connection.

[0162] In the latter way, the network-side device can carry the frequency-band combination information in the cascading indication information. The frequency-band combination information is used to indicate the frequency-band combination of the frequency-domain units related to the terminal's frequency-band combination capability. Exemplarily, the frequency-band combination information includes a combination identifier, which is used to indicate the combination of the frequency bands supported by the terminal. Optionally, the frequency-band combination information further includes the identifiers of the combined frequency bands. For example, if the terminal supports frequency band A and frequency band C, then the frequency-band combination information further includes the identifiers or frequency information of frequency band A and frequency band C.

[0163] Figure 11 For the cascading schematic diagram of the CORESETs of the frequency-domain units of multiple terminals, refer to Figure 11 , terminal 1 only supports frequency band A and frequency band C, terminal 2 only supports frequency band B and frequency band C, and terminal 3 only supports frequency band C. Then, the network-side device configures CORESET i1 of frequency band A and CORESET k1 of frequency band C for terminal 1, configures CORESET j1 of frequency band B and CORESET k2 of frequency band C for terminal 2, and configures CORESET k3 of frequency band C for terminal 3 according to the frequency-band combination capabilities of each terminal.

[0164] The terminal 1 can see CORESET i in frequency band A and CORESET k1 in frequency band C through the configuration parameters on the network side, and can cascade CORESET i and CORESET k1 into a cascaded CORESET m. The terminal 1 receives PDCCH on the cascaded CORESET m. The terminal 2 can see CORESET j1 in frequency band B and CORESET k2 in frequency band C through the configuration parameters on the network side, and can cascade CORESET j1 and CORESET k2 into a cascaded CORESET n. The terminal 2 receives PDCCH on the cascaded CORESET n. The terminal 3 can see CORESET k3 on frequency band C through the configuration parameters on the network side, and the terminal 3 receives PDCCH on (cascaded) CORESET n k3.

[0165] Optionally, any one of the M frequency domain units is used to transmit downlink control information to improve flexibility. Exemplarily, Figures 8 - 11 On the indicated frequency bands, the network side device only transmits SSB on the frequency domain units of frequency band C. The terminal can receive PDCCH on the CORESET of any frequency domain unit. At this time, the CORESETs of multiple frequency domain units can be not cascaded.

[0166] Optionally, at least one of the following configuration parameters of the terminal that does not expect to cascade CORESETs is different:

[0167] Starting symbol;

[0168] Number of continuous symbols;

[0169] CCE-to-REG mapping type;

[0170] Quasi-Colocation (QCL);

[0171] Indication of the existence of the Transmission Configuration Indication (TCI) field;

[0172] Scrambling ID of PDCCH-DMRS;

[0173] Associated search space type;

[0174] SCS;

[0175] CP.

[0176] If at least one of the following configuration parameters of the terminal that does not expect to cascade CORESETs is different, it can be understood that at least one of the following configuration parameters of the UE that expects to cascade CORESETs is the same.

[0177] The mapping type from CCE to REG is an interleaved type or a non - interleaved type. When the mapping type from CCE to REG adopted within a cascaded CORESET is an interleaved type, diversity gain can be provided to enhance the transmission reliability of PDCCH.

[0178] The indication of the existence of the TCI field is used to indicate whether there is a TCL field in the DCI.

[0179] The network side can configure a search space for a cascaded CORESET. The search space type associated with the cascaded CORESET can be a common search space or a dedicated search space.

[0180] A cascaded CORESET may include one or more CORESETs. The search space associated with the cascaded CORESET refers to the search spaces of each CORESET included in the cascaded CORESET. Among them, the search spaces of each CORESET included in the cascaded CORESET can be the same or different. When the search spaces associated with the cascaded CORESET are different, the search spaces associated with the cascaded CORESET should meet predefined requirements, for example, requirements related to the ability to monitor PDCCH based on time slots or spans.

[0181] The method of this embodiment can be used before or after RRC connection establishment. Before RRC connection establishment, the CORESET configuration information can be notified through SIB. Before RRC connection establishment, the network - side device may not be able to obtain the capabilities of the terminal. Therefore, the network - side device needs to configure and cascade - configure the CORESET on the frequency - domain unit according to the prior information of the terminal capabilities supported by the frequency - domain unit.

[0182] After RRC connection establishment, the CORESET configuration information can be notified through RRC messages. At this time, the network - side device has obtained the terminal capabilities and can configure one or more CORESETs on a frequency - domain unit. Therefore, the network - side device can configure the frequency - domain unit related to the terminal's band - combination capabilities according to the capabilities of the terminal.

[0183] In this embodiment, the terminal obtains the configuration information of M frequency domain units, where M is less than or equal to the number P of frequency domain units configured for the serving cell of the terminal. The terminal obtains the frequency domain resources of the CORESET on the M frequency domain units, determines the order of the CORESET on the M frequency domain units, and cascades at least one cascaded CORESET according to the order of the CORESET on the M frequency domain units. This cascaded CORESET is used to receive the PDCCH. By configuring the CORESET on all or part of the frequency domain units of the serving cell of the terminal and cascading the configured CORESET across frequency band units to form a cascaded CORESET, and receiving the PDCCH on the cascaded CORESET, the cascaded CORESET has a larger bandwidth, reduces the PDCCH collision probability, increases the PDCCH coverage ability and transmission reliability, and increases network flexibility.

[0184] Embodiment 3

[0185] Embodiment 3 of the present application provides a method for transmitting a control channel. The implementation manners described in Embodiments 1 and 2 can be applied to Embodiment 3 and achieve the same technical effects. Figure 12 It is a flowchart of the method for transmitting a control channel provided in Embodiment 3 of the present application. As Figure 12 shown, the method provided in this embodiment includes the following steps.

[0186] S301. The terminal obtains the configuration information of M frequency domain units, where the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal, and M is less than or equal to the number P of frequency domain units configured for the serving cell of the terminal.

[0187] S302. The terminal obtains the frequency domain resources of the CORESET on the M frequency domain units.

[0188] S303. The terminal determines that the CORESET of each of the M frequency domain units is an independent CORESET for receiving the PDCCH.

[0189] Different from the solution in Embodiment 2, in this embodiment, the CORESET on the M frequency domain units of the frequency band combination supported by the terminal is not cascaded, but the CORESET on the M frequency domain units of the frequency band combination supported by the terminal is used as an independent CORESET. The terminal can simultaneously use the CORESET on the M frequency domain units to receive the PDCCH, which is equivalent to increasing the frequency domain range of the CORESET for receiving the PDCCH, thereby increasing the transmission reliability and network flexibility. Further, the PDCCH collision probability can be reduced and the PDCCH coverage ability can be improved.

[0190] Refer to Figure 13 , Figure 13A schematic diagram of a CORESET for a frequency-domain unit of a terminal. Assume that the frequency-band combination capabilities of the terminals are as follows: Terminal 1 only supports frequency bands A and C, Terminal 2 only supports frequency bands B and C, and Terminal 3 only supports frequency band C. Then, the CORESETs determined by Terminal 1 for receiving PDCCH are CORESET i1 on frequency band A and CORESET k1 on frequency band C, the CORESETs determined by Terminal 2 for receiving PDCCH are CORESET j1 on frequency band B and CORESET k1 on frequency band C, and the CORESET determined by Terminal 3 for receiving PDCCH is CORESET k1 on frequency band C.

[0191] Figure 13 Taking the example that there is only one CORESET on each frequency band. Of course, there can be multiple CORESETs on each frequency band. When there are multiple CORESETs on the frequency bands supported by the terminal, the terminal can select all or part of the multiple CORESETs to receive PDCCH according to predefined rules, or determine all or part of the multiple CORESETs to receive PDCCH according to the indication of the network-side device. For example, the network-side device can indicate the index of the CORESET for receiving PDCCH.

[0192] Optionally, the number of CORESETs on any one of the frequency-domain units in the frequency-domain unit of the frequency-band combination supported by the terminal is not greater than the maximum number of CORESETs supported by the terminal, that is, the terminal does not expect the number of CORESETs on any one of the frequency-domain units to be greater than the CORESET number capability supported by the terminal. The CORESET number capability supported by the terminal is the maximum number of CORESETs supported by the terminal. It can be understood that the maximum number of CORESETs supported by the terminal on different types of frequency-domain units may be different. Taking BWP as an example, there are at most 3 CORESETs configured on the BWP, so the maximum number of CORESETs supported by the terminal is 3.

[0193] In this embodiment, the terminal obtains the configuration information of M frequency-domain units, where the M frequency-domain units are the frequency-domain units of the frequency-band combination supported by the terminal, and M is less than or equal to the number P of frequency-domain units configured for the serving cell of the terminal. The terminal obtains the frequency-domain resources of the CORESETs on the M frequency-domain units, and determines the CORESET of each of the M frequency-domain units as an independent CORESET to receive PDCCH. In this embodiment, the terminal can simultaneously use the CORESETs on the M frequency-domain units to receive PDCCH, which is equivalent to increasing the frequency-domain range of the CORESETs for receiving PDCCH, thereby increasing the transmission reliability, increasing the network flexibility. Further, it can reduce the PDCCH collision probability and improve the PDCCH coverage ability.

[0194] Embodiment 4

[0195] Embodiment 4 of this application provides a method for transmitting a control channel, which is executed by a network-side device. Figure 14 It is a flowchart of the method for transmitting a control channel provided in Embodiment 4 of this application. As Figure 14 shown, the method provided in this embodiment includes the following steps.

[0196] S401. The network-side device sends configuration information of M frequency-domain units to the terminal, where M is less than or equal to the number P of frequency-domain units configured for the serving cell of the terminal.

[0197] The configuration information of the M frequency-domain units includes at least one of the following:

[0198] Frequency reference points of the M frequency-domain units;

[0199] Frequency offset values of each of the M frequency-domain units relative to the frequency reference point;

[0200] SCS of each of the M frequency-domain units;

[0201] CP of each of the M frequency-domain units;

[0202] Start RB and size of each of the M frequency-domain units;

[0203] Index of each of the M frequency-domain units.

[0204] The value of M is less than or equal to P, that is, the network-side device can configure the CORESET only on some frequency-domain units of the serving cell, making the configuration of the CORESET more flexible. The M frequency-domain units can be any M frequency-domain units in the serving cell of the terminal, or the frequency-domain units of the frequency band combination supported by the terminal.

[0205] S402. The network-side device sends the frequency-domain resources of the CORESET on the M frequency-domain units to the terminal.

[0206] Optionally, the network-side device can send the configuration information of the M frequency-domain units and the frequency-domain resources of the CORESET to the terminal through the same message, or can send the configuration information of the M frequency-domain units and the frequency-domain resources of the CORESET to the terminal through different messages.

[0207] One or more CORESETs can be configured on one frequency-domain unit, and the frequency-domain resources or time-domain resources of multiple CORESETs within one frequency-domain unit can overlap.

[0208] S403. The network device sends PDCCH on at least one CORESET according to the configuration information of M frequency-domain units and the frequency-domain resources of the CORESET.

[0209] The network device enables the terminal to combine all or part of the CORESETs on M frequency-domain units across frequency-domain units by sending the configuration information of M frequency-domain units and the frequency-domain resources of the CORESET to the terminal, so as to determine the CORESET for receiving PDCCH. Similarly, the network device also needs to combine all or part of the CORESETs on M frequency-domain units across frequency-domain units according to the configuration information of M frequency-domain units and the frequency-domain resources of the CORESET, and determine at least one CORESET for sending PDCCH.

[0210] In one implementation, the network device determines the order of the CORESETs on M frequency-domain units, and cascades at least one cascaded CORESET according to the order of the CORESETs on M frequency-domain units. The network device sends PDCCH on the cascaded CORESET.

[0211] The method for the network device to sort the CORESETs on M frequency-domain units refers to the sorting method of the terminal in the foregoing embodiments, which will not be elaborated here.

[0212] The network device can cascade at least one cascaded CORESET according to the order of the CORESETs on M frequency-domain units and a predefined cascading rule. The predefined rule can be negotiated between the network device and the terminal, or determined and sent by the network device to the terminal. Subsequently, both the network device and the terminal cascade the CORESETs on M frequency-domain units according to the predefined cascading rule.

[0213] Alternatively, the network device determines how many cascaded CORESETs to form and the CORESETs on M frequency-domain units participating in the cascade according to some information. The network device generates cascade indication information, which includes the identifier of the cascaded CORESET and the index of the CORESETs on M frequency-domain units participating in the cascade. The terminal device can cascade the CORESETs on M frequency-domain units according to the cascade indication information and send the cascade indication information to the terminal, so that the terminal cascades according to the cascade indication information.

[0214] When the M frequency-domain units are the frequency-domain units of the frequency-band combination supported by the terminal, optionally, the network-side device may cascade the CORESETs on the M frequency-domain units. The specific method used by the network-side device for cascading refers to the method used by the terminal for cascading in the foregoing embodiments, which will not be elaborated here. Optionally, the cascading indication information further includes frequency-band combination information, which is used to indicate the frequency-band combination of the frequency-domain units related to the frequency-band combination capability of the terminal. When the M frequency-domain units are the frequency-domain units of the frequency-band combination supported by the terminal, optionally, the network-side device may not cascade the CORESETs on the M frequency-domain units, that is, the network-side device may determine the CORESET of each frequency-domain unit in the M frequency-domain units as an independent CORESET for transmitting the PDCCH. Correspondingly, the network-side device transmits the PDCCH to the terminal on the CORESETs of the M frequency-domain units. In this manner, the network-side device only transmits the PDCCH on the frequency-domain units of the frequency-band combination supported by the terminal.

[0215] Optionally, the network-side device transmits downlink control information on some of the M frequency-domain units. For example, the network-side device only transmits downlink control information on any one of the M frequency-domain units.

[0216] In this embodiment, the network-side device transmits configuration information of M frequency-domain units to the terminal, where M is less than or equal to the number P of frequency-domain units configured for the serving cell of the terminal, transmits the frequency-domain resources of the CORESETs on the M frequency-domain units to the terminal, and transmits the PDCCH on at least one CORESET according to the configuration information of the M frequency-domain units and the frequency-domain resources of the CORESET. By configuring the CORESET on some of the frequency-domain units of the serving cell of the terminal, the network-side device can reduce the common signaling overhead, achieve the load balancing of each uplink / downlink carrier, and the network-side device combines all or part of the CORESETs on the M frequency-domain units across the frequency-domain units to obtain the CORESET for transmitting the PDCCH, so that the CORESET for transmitting the PDCCH has a larger bandwidth, reduces the PDCCH collision probability, increases the PDCCH coverage capability and transmission reliability, and increases the network flexibility.

[0217] Embodiment 5

[0218] Based on the foregoing embodiments, Embodiment 5 of the present application provides a method for transmitting a control channel. This embodiment is used to describe the signaling interaction between the terminal and the network-side device during the transmission of the control channel. Figure 15 This is the signaling flow chart of a method for transmitting a control channel provided by Embodiment 5 of the present application. As Figure 15 shown, the method provided in this embodiment includes the following steps.

[0219] S501. The network - side device sends the configuration information of M frequency - domain units to the terminal.

[0220] Wherein, M is less than or equal to the number P of frequency - domain units configured for the serving cell of the terminal.

[0221] S502. The network - side device sends the frequency - domain resources of the CORESET on the M frequency - domain units to the terminal.

[0222] S503. The network - side device determines at least one CORESET for transmitting the PDCCH according to the configuration information of the M frequency - domain units and the frequency - domain resources of the CORESET.

[0223] S504. The terminal device determines at least one CORESET for receiving the PDCCH according to the configuration information of the M frequency - domain units and the frequency - domain resources of the CORESET.

[0224] Wherein, steps S503 and S504 have no sequence when executed and can also be executed simultaneously.

[0225] S505. The network - side device transmits the PDCCH on the determined at least one CORESET.

[0226] S506. The terminal receives the PDCCH on the determined at least one CORESET.

[0227] The specific implementation manner of this embodiment refers to the description of the foregoing embodiments and will not be elaborated here.

[0228] Embodiment Six

[0229] In the control - channel transmission method provided by the embodiments of the present application, the execution subject can be the control - channel transmission device installation . In the embodiments of the present application, taking the control - channel transmission device as an example of executing the control - channel transmission method, the control - channel transmission device provided by the embodiments of the present application is described.

[0230] Figure 16 FIG. is a schematic structural diagram of a control - channel transmission device provided for Embodiment Six of the present application. The device can be applied in a terminal. As Figure 16 shown, the control - channel transmission device 100 provided in this embodiment includes the following modules.

[0231] An acquisition module 11, configured to acquire the configuration information of M frequency - domain units, where M is less than or equal to the number P of frequency - domain units configured for the serving cell of the terminal;

[0232] The acquisition module 11 is further configured to acquire the frequency - domain resources of the CORESET on the M frequency - domain units;

[0233] Determination module 12, configured to determine at least one CORESET for receiving PDCCH according to the configuration information of the M frequency-domain units and the frequency-domain resources of the CORESET.

[0234] In an optional implementation manner, the determination module 12 is specifically configured to:

[0235] Determine the order of the CORESETs on the M frequency-domain units;

[0236] According to the order of the CORESETs on the M frequency-domain units, cascade to form at least one cascaded CORESET for receiving the PDCCH.

[0237] In an optional implementation manner, the determination module 12 is specifically configured to:

[0238] Ascendingly or descendingly sort the CORESETs on the M frequency-domain units according to the start frequency of the CORESETs on the M frequency-domain units or the start frequency of the M frequency-domain units.

[0239] In another optional implementation manner, the determination module 12 is specifically configured to:

[0240] Ascendingly or descendingly sort the M frequency-domain units according to the start frequency of the M frequency-domain units.

[0241] In an optional implementation manner, the determination module 12 is specifically configured to:

[0242] According to the order of the CORESETs on the M frequency-domain units and a predefined cascading rule, cascade to form at least one cascaded CORESET.

[0243] In another optional implementation manner, the determination module is specifically configured to:

[0244] According to the order of the CORESETs on the M frequency-domain units and the cascading indication information sent by the network-side device, cascade to form at least one cascaded CORESET, where the cascading indication information includes the identifier of the cascaded CORESET and the indexes of the CORESETs participating in the cascading among the M frequency-domain units.

[0245] In an optional implementation manner, the M frequency-domain units are the frequency-domain units of the frequency-band combination supported by the terminal.

[0246] In an optional implementation manner, the M frequency-domain units are the frequency-domain units of the frequency-band combination supported by the terminal;

[0247] The cascaded indication information further includes frequency band combination information, and the frequency band combination information is used to indicate the frequency band combination of frequency domain units related to the frequency band combination capability of the terminal.

[0248] In an optional implementation manner, the terminal does not expect at least one of the following configuration parameters of the cascaded CORESET to be different:

[0249] Start symbol;

[0250] Number of continuous symbols;

[0251] Mapping type from CCE to REG;

[0252] QCL;

[0253] Indication of the existence of the TCI field;

[0254] PDCCH-DMRS-Scrambling ID;

[0255] Associated search space type;

[0256] SCS;

[0257] CP.

[0258] In an optional implementation manner, the mapping type from CCE to REG adopted within the cascaded CORESET is an interleaved type.

[0259] In an optional implementation manner, the search spaces of the CORESETs included in the cascaded CORESET are the same or different.

[0260] In an optional implementation manner, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal;

[0261] The determining module 12 is specifically configured to: determine the CORESET of each of the M frequency domain units as an independent CORESET for receiving PDCCH.

[0262] In an optional implementation manner, the number of CORESETs on any one of the frequency domain units of the frequency band combination supported by the terminal is not greater than the maximum number of CORESETs supported by the terminal.

[0263] In an optional implementation manner, the configuration information of the M frequency domain units includes at least one of the following:

[0264] Frequency reference point of the M frequency domain units;

[0265] Frequency offset value of each of the M frequency domain units relative to the frequency reference point;

[0266] The SCS of each of the M frequency-domain units;

[0267] The CP of each of the M frequency-domain units;

[0268] The starting resource block RB and size of each of the M frequency-domain units;

[0269] The index of each of the M frequency-domain units.

[0270] In an alternative implementation, the frequency reference points of the M frequency-domain units include at least one of the following:

[0271] The frequency reference points of the frequency-domain units among the M frequency-domain units that are not associated with CD-SSB;

[0272] A common frequency reference point of the frequency-domain units among the M frequency-domain units that are not associated with CD-SSB;

[0273] The frequency reference points of each of the M frequency-domain units;

[0274] A common frequency reference point of the M frequency-domain units.

[0275] In an alternative implementation, any one of the M frequency-domain units is used to transmit downlink control information.

[0276] In an alternative implementation, the M frequency-domain units include at least one of the following units: BWP, carrier, or frequency band.

[0277] By configuring the CORESET on partial frequency-domain units of the serving cell of the terminal, the network-side device can reduce the common signaling overhead, achieve the load balance of each uplink / downlink carrier. The terminal combines all or part of the CORESETs on the M frequency-domain units across the frequency-domain units to obtain the CORESET for receiving the PDCCH, so that the CORESET for receiving the PDCCH has a larger bandwidth, reduces the PDCCH collision probability, increases the PDCCH coverage ability and transmission reliability, and increases the network flexibility.

[0278] Embodiment Seven

[0279] Embodiment Seven of the present application provides a transmission device for a control channel. The transmission device for the control channel can be applied in a network-side device. Figure 17 For the structural schematic diagram of a transmission device for a control channel provided in Embodiment Seven of the present application, as Figure 17 shown, the transmission device 200 for the control channel provided in this embodiment includes the following modules.

[0280] A sending module 21, configured to send configuration information of M frequency domain units to a terminal, where M is less than or equal to the number P of frequency domain units configured in the serving cell of the terminal;

[0281] The sending module 21 is configured to send the frequency domain resources of the CORESET on the M frequency domain units to the terminal;

[0282] A processing module 22, configured to send a PDCCH on at least one CORESET according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET.

[0283] In an optional implementation manner, the processing module 22 is specifically configured to:

[0284] Determine the order of the CORESETs on the M frequency domain units;

[0285] Cascade to form at least one cascaded CORESET according to the order of the CORESETs on the M frequency domain units;

[0286] Send the PDCCH on the cascaded CORESET.

[0287] In an optional implementation manner, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal.

[0288] In an optional implementation manner, the sending module 21 is further configured to:

[0289] Send cascading indication information to the terminal, where the cascading indication information includes the identifier of the cascaded CORESET and the index of the CORESET participating in the cascading among the M frequency domain units.

[0290] In an optional implementation manner, when the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal, the cascading indication information further includes frequency band combination information, and the frequency band combination information is used to indicate the frequency band combination of the frequency domain units related to the frequency band combination capability of the terminal.

[0291] In an optional implementation manner, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal;

[0292] The processing module 22 is specifically configured to:

[0293] Determine each CORESET of the M frequency domain units as an independent CORESET for sending the PDCCH;

[0294] Send the PDCCH to the terminal on the CORESETs of the M frequency domain units.

[0295] By configuring the CORESET on some frequency domain units of the serving cell of the terminal, the network-side device can reduce the common signaling overhead, achieve the load balance of each uplink / downlink carrier, and the network-side device combines all or part of the CORESET on M frequency domain units across frequency domain units to obtain the CORESET for transmitting the PDCCH, so that the CORESET for transmitting the PDCCH has a larger bandwidth, reduces the PDCCH collision probability, increases the PDCCH coverage ability and transmission reliability, and increases network flexibility.

[0296] The transmission device of the control channel in the embodiments of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal or other devices other than the terminal. Exemplarily, the terminal may include, but is not limited to, the types of the terminal 11 listed above, and other devices may be a server, a Network Attached Storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0297] The transmission device of the control channel provided by the embodiments of the present application can implement Figures 2 - 15 each process implemented by the method embodiments and achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0298] As Figure 18 shown, the embodiments of the present application further provide a communication device 300, including a processor 31 and a memory 32. A program or instruction that can run on the processor 31 is stored on the memory 32. For example, when the communication device 300 is a terminal, when the program or instruction is executed by the processor 31, it implements the above Figures 2 - 13 steps of the method embodiments and can achieve the same technical effects. When the communication device 300 is a network-side device, when the program or instruction is executed by the processor 31, it implements the above Figure 14 steps of the method embodiments and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0299] The embodiments of the present application further provide a terminal, including a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the steps in the method embodiments as Figures 2 - 13 shown. This terminal embodiment corresponds to the above terminal-side method embodiments. Each implementation process and implementation manner of the above method embodiments can be applied to this terminal embodiment and can achieve the same technical effects. Specifically, Figure 19 is a schematic diagram of the hardware structure of a terminal for implementing the embodiments of the present application.

[0300] The terminal 400 includes, but is not limited to, at least some components such as a radio frequency unit 41, a network module 42, an audio output unit 43, an input unit 44, a sensor 45, a display unit 46, a user input unit 47, an interface unit 48, a memory 49, and a processor 410, etc.

[0301] Those skilled in the art can understand that the terminal 400 may further include a power source (such as a battery) for powering each component. The power source can be logically connected to the processor x10 through a power management system, so as to implement functions such as management of charging, discharging, and power consumption management through the power management system. In the figure 19 The terminal structure shown does not limit the terminal. The terminal may include more or fewer components than shown, or combine some components, or have different component arrangements, which will not be elaborated here.

[0302] It should be understood that in the embodiments of the present application, the input unit 44 may include a graphics processing unit (GPU) 441 and a microphone 442. The graphics processor 441 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 46 may include a display panel 461, and the display panel 461 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 47 includes at least one of a touch panel 471 and other input devices 472. The touch panel 471 is also called a touch screen. The touch panel 471 may include two parts: a touch detection device and a touch controller. The other input devices 472 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be elaborated here.

[0303] In the embodiments of the present application, after the radio frequency unit 41 receives downlink data from a network side device, it can be transmitted to the processor 410 for processing; in addition, the radio frequency unit 41 can send uplink data to the network side device. Generally, the radio frequency unit 41 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0304] The memory 49 can be used to store software programs or instructions as well as various data. The memory 49 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data. Among them, the first storage area can store an operating system, application programs or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 49 can include volatile memory or non-volatile memory. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDR SDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM), and a direct rambus random access memory (DRRAM). The memory 49 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0305] The processor 410 may include one or more processing units; optionally, the processor 410 integrates an application processor and a modem processor. Among them, the application processor mainly processes operations related to the operating system, user interface, and application programs, etc., and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above modem processor may not be integrated into the processor 410.

[0306] Among them, the processor 410 is used to obtain configuration information of M frequency domain units, where M is less than or equal to the number P of frequency domain units configured by the serving cell of the terminal; obtain the frequency domain resources of the control resource set CORESET on the M frequency domain units; and determine at least one CORESET for receiving the PDCCH according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET.

[0307] By configuring the CORESET on some frequency domain units of the serving cell of the terminal, the common signaling overhead can be reduced, and the load balance of each uplink / downlink carrier can be achieved. By combining all or part of the CORESETs on M frequency domain units across frequency domain units, the CORESET for receiving the PDCCH is obtained, so that the CORESET for receiving the PDCCH has a larger bandwidth, reducing the PDCCH collision probability, increasing the PDCCH coverage ability and transmission reliability, and increasing the network flexibility.

[0308] It can be understood that the implementation processes of the various implementation manners mentioned in this embodiment can refer to the relevant descriptions of the method embodiment Figures 2 - 13 and achieve the same or corresponding technical effects. To avoid repetition, they will not be elaborated here.

[0309] The embodiment of the present application also provides a network-side device, including a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the steps of the method embodiment as Figure 14 shown. This embodiment of the network-side device corresponds to the above-mentioned method embodiment of the network-side device. The various implementation processes and implementation manners of the above method embodiment can all be applied to this embodiment of the network-side device and can achieve the same technical effects.

[0310] Specifically, the embodiment of the present application also provides a network-side device. As Figure 20 shown, the network-side device 500 includes: an antenna 51, a radio frequency device 52, a baseband device 53, a processor 54, and a memory 55. The antenna 51 is connected to the radio frequency device 52. In the uplink direction, the radio frequency device 52 receives information through the antenna 51 and sends the received information to the baseband device 53 for processing. In the downlink direction, the baseband device 53 processes the information to be sent and sends it to the radio frequency device 52. The radio frequency device 52 processes the received information and then sends it out through the antenna 51.

[0311] The method executed by the network-side device in the above embodiments can be implemented in the baseband device 53. The baseband device 53 includes a baseband processor.

[0312] The baseband device 53 may include, for example, at least one baseband board. A plurality of chips are provided on the baseband board. As Figure 20 shown, one of the chips is, for example, a baseband processor, which is connected to the memory 55 through a bus interface to call the program in the memory 55 and execute the operations of the network device shown in the above method embodiment.

[0313] The network-side device may further include a network interface 56, and this interface is, for example, a Common Public Radio Interface (CPRI).

[0314] Specifically, the network - side device 500 according to the embodiments of the present invention further includes: instructions or programs stored in the memory 55 and executable on the processor 54, and the processor 54 calls the instructions or programs in the memory 55 to execute Figure 17 the methods executed by the modules shown, and achieves the same technical effects. To avoid repetition, details are not described herein.

[0315] The embodiments of the present application further provide a readable storage medium, on which programs or instructions are stored. When the programs or instructions are executed by a processor, the Figures 2 - 14 various processes of the method embodiments shown above are implemented, and the same technical effects can be achieved. To avoid repetition, details are not described here.

[0316] Wherein, the processor is the processor in the terminal described in the above embodiments. The readable storage medium includes computer - readable storage media, such as computer read - only memory ROM, random access memory RAM, magnetic disks or optical discs, etc. In some examples, the readable storage medium may be a non - transient readable storage medium.

[0317] The embodiments of the present application further provide a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the Figures 2 - 14 various processes of the method embodiments shown above, and the same technical effects can be achieved. To avoid repetition, details are not described here.

[0318] It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system - on - chip, system chip, chip system or system - on - a - chip, etc.

[0319] The embodiments of the present application further provide a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the method embodiments for transmitting the control channel shown above, and the same technical effects can be achieved. To avoid repetition, details are not described here.

[0320] The embodiments of the present application further provide a communication system, including: a terminal and a network - side device. The terminal can be used to execute the Figures 2 - 13 steps of the method shown above, and the network - side device can be used to execute the Figure 14 steps of the method shown above.

[0321] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0322] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described example methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. This computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes several instructions for causing a terminal or a network-side device to execute the methods described in various embodiments of the present application.

[0323] The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms of embodiments without departing from the purpose of the present application and the scope protected by the claims. These embodiments are all within the protection scope of the present application.

Claims

1. A method for transmitting a control channel, characterized in that, comprising: A terminal obtains configuration information of M frequency domain units, where M is less than or equal to the number P of frequency domain units configured by the serving cell of the terminal; The terminal obtains the frequency domain resources of a control resource set CORESET on the M frequency domain units; The terminal determines at least one CORESET for receiving a physical downlink control channel PDCCH according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET.

2. The method according to claim 1, characterized in that, The terminal determines at least one CORESET for receiving a physical downlink common control channel PDCCH according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET, including: The terminal determines the order of the CORESETs on the M frequency domain units; The terminal cascades at least one cascaded CORESET according to the order of the CORESETs on the M frequency domain units, and the cascaded CORESET is used to receive the PDCCH.

3. The method according to claim 2, characterized in that, The terminal determines the order of the CORESETs on the M frequency domain units, including: The terminal sorts the CORESETs on the M frequency domain units in ascending or descending order according to the starting frequency of the CORESETs on the M frequency domain units or the starting frequencies of the M frequency domain units.

4. The method according to claim 2 or 3, characterized in that, The terminal cascades at least one cascaded CORESET according to the order of the CORESETs on the M frequency domain units, including: The terminal cascades at least one cascaded CORESET according to the order of the CORESETs on the M frequency domain units and a predefined cascading rule or cascading indication information sent by a network side device, and the cascading indication information includes an identifier of the cascaded CORESET and indexes of the CORESETs participating in the cascading among the M frequency domain units.

5. The method according to any one of claims 2-4, characterized in that, The M frequency domain units are frequency domain units of a frequency band combination supported by the terminal.

6. The method according to claim 4, characterized in that, The M frequency domain units are frequency domain units of a frequency band combination supported by the terminal; The cascading indication information further includes frequency band combination information, and the frequency band combination information is used to indicate a frequency band combination of frequency domain units related to the frequency band combination capability of the terminal.

7. The method according to any one of claims 2-6, characterized in that, The terminal does not expect at least one of the following configuration parameters of the cascaded CORESET to be different: Starting symbol; Number of continuous symbols; Mapping type from control channel element CCE to resource element group REG; Quasi co-location relationship QCL; Indication of the existence of the transmission configuration indication TCI field; PDCCH-DMRS-Scrambling ID; Associated search space type; Subcarrier spacing SCS; Cyclic prefix CP.

8. The method according to claim 1, wherein, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal; the terminal determines at least one CORESET for receiving the physical downlink control channel PDCCH according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET, including: the terminal determines the CORESET of each of the M frequency domain units as an independent CORESET for receiving the PDCCH.

9. The method according to any one of claims 1-8, wherein, the configuration information of the M frequency domain units includes at least one of the following: the frequency reference point of the M frequency domain units; the frequency offset value of each of the M frequency domain units relative to the frequency reference point; the SCS of each of the M frequency domain units; the CP of each of the M frequency domain units; the starting resource block RB and size of each of the M frequency domain units; the index of each of the M frequency domain units.

10. A method for transmitting a control channel, wherein, it includes: the network side device sends the configuration information of M frequency domain units to the terminal, where M is less than or equal to the number P of frequency domain units configured by the serving cell of the terminal; the network side device sends the frequency domain resources of the control resource set CORESET on the M frequency domain units to the terminal; the network side device sends the physical downlink control channel PDCCH on at least one CORESET according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET.

11. The method according to claim 10, wherein, the network side device sends the downlink control channel PDCCH on at least one CORESET according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET, including: the network side device determines the order of the CORESET on the M frequency domain units; the network side device cascades to form at least one cascaded CORESET according to the order of the CORESET on the M frequency domain units; the network side device sends the PDCCH on the cascaded CORESET.

12. The method according to claim 11, wherein, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal.

13. The method according to claim 11 or 12, wherein, it further includes: the network side device sends cascading indication information to the terminal, and the cascading indication information includes the identifier of the cascaded CORESET and the index of the CORESET participating in the cascading among the M frequency domain units.

14. The method according to claim 13, wherein, when the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal, the cascading indication information further includes frequency band combination information, and the frequency band combination information is used to indicate the frequency band combination of the frequency domain units related to the frequency band combination capability of the terminal.

15. The method according to claim 10, wherein, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal; the network side device sends a physical downlink control channel PDCCH on at least one CORESET according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET, including: the network side device determines the CORESET of each of the M frequency domain units as an independent CORESET for sending the PDCCH; the network side device sends the PDCCH to the terminal on the CORESET of the M frequency domain units.

16. A transmission device for a control channel, wherein, it includes: an acquisition module, configured to acquire configuration information of M frequency domain units, where M is less than or equal to the number P of frequency domain units configured for the serving cell of the terminal; the acquisition module is further configured to acquire the frequency domain resources of a control resource set CORESET on the M frequency domain units; a determination module, configured to determine at least one CORESET for receiving a physical downlink control channel PDCCH according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET.

17. The device according to claim 16, wherein, the determination module is specifically configured to: determine the order of the CORESETs on the M frequency domain units; cascade at least one cascaded CORESET according to the order of the CORESETs on the M frequency domain units, and the cascaded CORESET is used to receive the PDCCH.

18. The device according to claim 17, wherein, the determination module is specifically configured to: ascend or descend the order of the CORESETs on the M frequency domain units according to the starting frequency of the CORESETs on the M frequency domain units or the starting frequencies of the M frequency domain units.

19. The device according to claim 17 or 18, wherein, the determination module is specifically configured to: cascade at least one cascaded CORESET according to the order of the CORESETs on the M frequency domain units, and a predefined cascading rule or cascading indication information sent by the network side device, and the cascading indication information includes the identifier of the cascaded CORESET and the indexes of the CORESETs participating in the cascading among the M frequency domain units.

20. The device according to any one of claims 17-19, wherein, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal.

21. The device according to any one of claims 17-20, wherein, the terminal does not expect at least one of the following configuration parameters of the cascaded CORESET to be different: starting symbol; number of continuous symbols; mapping type from control channel element CCE to resource element group REG; quasi co-location relationship QCL; indication of the existence of the transmission configuration indication TCI field; PDCCH-DMRS-Scrambling ID; associated search space type; subcarrier spacing SCS; cyclic prefix CP.

22. The device according to claim 17, wherein, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal; the determining module is specifically configured to: determine the CORESET of each of the M frequency domain units as an independent CORESET for receiving PDCCH.

23. A transmission device for a control channel, wherein, it includes: a sending module, configured to send configuration information of M frequency domain units to a terminal, where M is less than or equal to the number P of frequency domain units configured by the serving cell of the terminal; the sending module is configured to send the frequency domain resources of the control resource set (CORESET) on the M frequency domain units to the terminal; a processing module, configured to send a physical downlink control channel (PDCCH) on at least one CORESET according to the configuration information of the M frequency domain units and the frequency domain resources of the CORESET.

24. The device according to claim 23, wherein, the processing module is specifically configured to: determine the order of the CORESETs on the M frequency domain units; cascade at least one cascaded CORESET according to the order of the CORESETs on the M frequency domain units; send the PDCCH on the cascaded CORESET.

25. The device according to claim 24, wherein, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal.

26. The device according to claim 24 or 25, wherein, the sending module is further configured to: send cascading indication information to the terminal, where the cascading indication information includes the identifier of the cascaded CORESET and the index of the CORESETs participating in the cascading among the M frequency domain units.

27. The device according to claim 23, wherein, the M frequency domain units are the frequency domain units of the frequency band combination supported by the terminal; the processing module is specifically configured to: determine the CORESET of each of the M frequency domain units as an independent CORESET for sending PDCCH; send the PDCCH to the terminal on the CORESETs of the M frequency domain units.

28. A terminal, wherein, it includes a processor and a memory, and the memory stores a program or instruction that can run on the processor. When the program or instruction is executed by the processor, the steps of the control channel transmission method according to any one of claims 1 to 9 are implemented.

29. A network side device, wherein, it includes a processor and a memory, and the memory stores a program or instruction that can run on the processor. When the program or instruction is executed by the processor, the steps of the control channel transmission method according to any one of claims 10 to 15 are implemented.

30. A readable storage medium, wherein, a program or instruction is stored on the readable storage medium. When the program or instruction is executed by a processor, the control channel transmission method according to any one of claims 1 - 9 is implemented, or the steps of the control channel transmission method according to any one of claims 10 to 15 are implemented.

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