WO2023279969A1

WO2023279969A1 - Data transmission method and communication apparatus

Info

Publication number: WO2023279969A1
Application number: PCT/CN2022/100588
Authority: WO
Inventors: 罗之虎; 金哲; 侯海龙; 曲韦霖
Original assignee: 华为技术有限公司
Priority date: 2021-07-09
Filing date: 2022-06-22
Publication date: 2023-01-12
Also published as: CN115604831A

Abstract

Provided in the present application are a data transmission method and a communication apparatus. The method comprises: a network device determining a first candidate control channel, wherein the first candidate control channel is composed of N second candidate control channels, the aggregation level of the first candidate control channel is K, the aggregation level of the second candidate control channels is M, N is greater than 1, and M is smaller than K; and the network device sending, on the first candidate control channel, downlink control information (DCI) to a terminal device. By means of the method, a terminal device having a relatively low bandwidth capability can receive a candidate control channel having a high aggregation level.

Description

Method and communication device for data transmission

This application claims the priority of the Chinese patent application with the application number 202110781014.1 and the application title "A Method and Communication Device for Data Transmission" filed with the China Patent Office on July 9, 2021, the entire contents of which are incorporated herein by reference Applying.

technical field

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

Background technique

Nowadays, in order to support relatively low-cost Internet of Things applications, the most direct means is to reduce the working bandwidth of the terminal, because the large bandwidth has a great impact on the analog to digital converter (analog to digital converter, ADC), digital to analog converter (digital to analog converter) , DAC), fast Fourier transform (fast flourier transform, FFT), buffer (buffer), and downlink (Downlink, DL) and uplink (Uplink, UL) processing modules, etc. have high baseband processing requirements, while Small bandwidths can relax these hardware requirements, reducing costs. Therefore, in order to support relatively low-cost IoT applications, narrowband IoT terminals will be introduced into the New Radio (NR) system.

At present, the minimum channel bandwidth supported by NR is 5MHz. Based on the existing protocol framework, the minimum bandwidth supported by narrowband IoT terminals should be 5MHz. Assuming that the existing Physical Downlink Control Channel (PDCCH) structure is used, when the subcarrier spacing is 30kHz, the Control Resource Set (CORESET) occupies 3 OFDM ( Orthogonal Frequency-Division Multiplexing, OFDM) symbols, the bandwidths occupied by candidate PDCCHs with aggregation levels (Aggregation level, AL) of 8 and 16 in the frequency domain are 5.76MHz and 11.52MHz, respectively, where AL refers to the control that constitutes the candidate PDCCH Channel unit (Control-channel element, CCE) quantity. Therefore, the NB-IoT terminal cannot receive candidate PDCCHs with aggregation levels 8 and 16 based on the 5MHz bandwidth capability. How to enable narrowband IoT terminals to receive candidate PDCCHs with a high aggregation level is an urgent problem to be solved.

Contents of the invention

The present application provides a data transmission method and a communication device, which enable terminal equipment with low bandwidth capabilities to receive candidate control channels with a high aggregation level.

In a first aspect, the present application provides a data transmission method, the method comprising: a network device determines a first candidate control channel, the first candidate control channel is composed of N second candidate control channels, and the first candidate control channel The aggregation level of the second candidate control channel is K, the aggregation level of the second candidate control channel is M, N is greater than 1, and M is smaller than K; the network device sends downlink control information DCI to the terminal device on the first candidate control channel.

According to the method described in the first aspect, since the first candidate control channel with an aggregation level of K is composed of N second candidate control channels with an aggregation level of M, and M is smaller than K, the candidate control channel with a smaller aggregation level occupies a bandwidth smaller. Based on this method, a terminal device with a lower bandwidth capability can receive a candidate control channel with a high aggregation level sent by a network device.

According to the method described in the first aspect, in a possible implementation manner, the DCI carries first information and second information, and the first information and the second information are used by the terminal device to determine the first physical channel or the first physical channel scheduled by the DCI. The time domain resource of the reference signal; the first information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts transmission, or, the second The information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the transmission of the reference signal starts. Based on this implementation manner, it is beneficial for the terminal device to more accurately determine the time-domain resource of the first physical channel or reference signal scheduled by the DCI.

In a second aspect, the present application provides a data transmission method, the method includes: a terminal device receives downlink control information DCI from a network device, the DCI is sent by the network device through a first candidate control channel, the first candidate control channel It consists of N second candidate control channels, the aggregation level of the first candidate control channel is K, the aggregation level of the second candidate control channel is M, N is greater than 1, and M is less than K; the terminal device determines the first DCI scheduling according to the DCI A time-domain resource of a physical channel or reference signal.

According to the method described in the second aspect, in a possible implementation manner, the DCI carries first information and second information, the first information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time unit at which the DCI ends The time interval between the time unit and the time unit at which the first physical channel starts to transmit, or the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the reference signal starts to transmit; when the terminal device When determining the time domain resource of the first physical channel or reference signal scheduled by the DCI according to the DCI, this step specifically includes: the terminal device determines the time domain resource of the first physical channel or reference signal scheduled by the DCI according to the first information and the second information resource.

For the beneficial effects corresponding to the method described in the second aspect, reference may be made to the content described in the first aspect, which will not be repeated here.

According to the method described in the first aspect or the second aspect, in a possible implementation manner, K is greater than the first threshold. The first threshold may be a preset value, or the first threshold is configured by the network device, or the first threshold is associated with the bandwidth capability of the terminal device. By setting the first threshold, it can be avoided that when a terminal device with a low bandwidth capability can receive the first candidate control channel whose aggregation level is less than or equal to the first threshold, the network device still splits the first candidate control channel whose aggregation level is less than the first threshold. Divided into multiple second candidate control channels, so that the DCI transmission delay increases. Based on this method, the network implementation is more flexible, the network device can complete the sending of the DCI as soon as possible, and at the same time, the terminal device can also complete the receiving of the DCI as soon as possible, reducing the DCI transmission delay.

According to the method described in the first aspect or the second aspect, in a possible implementation manner, N, M and K satisfy:

or

Based on this implementation manner, a terminal device with a lower bandwidth capability can receive a candidate control channel with a high aggregation level sent by a network device.

According to the method described in the first aspect or the second aspect, in a possible implementation manner, the N second candidate control channels belong to the same search space set. Based on this implementation, the N second candidate control channels can use the same search space set configuration parameters, which can reduce the signaling overhead of the search space set configuration.

Optionally, the N second candidate control channels are located in the same time slot, or the N second candidate control channels are located in different time slots. Based on this implementation, the N second candidate control channels are located in the same time slot, which can reduce the DCI transmission delay; the N second candidate control channels are located in different time slots, which can reduce the number of DCI monitoring times, thereby reducing the cost of terminal equipment. Detect DCI power consumption.

Further optionally, the N second candidate control channels are located in the same time slot; the N second candidate control channels occupy consecutive OFDM symbols in the same time slot, or the N second candidate control channels The control channel occupies discontinuous OFDM symbols in the same time slot. Based on this implementation, N second candidate control channels occupy continuous OFDM symbols in the same time slot, which can reduce DCI transmission delay; N second candidate control channels in the same time slot Occupying discontinuous OFDM symbols can prevent the downlink channel from being occupied by terminal equipment with low bandwidth capability for a long time, and the network equipment can allocate OFDM symbols that are not occupied by N second candidate control channels in the same time slot to other terminal equipment for use .

Further optionally, the N second candidate control channels are located in different time slots; the N second candidate control channels are located in consecutive time slots. Based on this implementation, the N second candidate control channels are located in different time slots, which can prevent the downlink channel from being occupied by terminal equipment with low bandwidth capability for a long time, and the network device can use OFDM symbols that are not occupied by the N second candidate control channels Distributed to other terminal equipment for use. DCI transmission delay can be reduced by constraining the N second candidate control channels to be located in consecutive time slots.

Optionally, the N second candidate control channels belong to multiple search space sets. Based on this implementation manner, the configuration of the second candidate control channel by the network device can be made more flexible.

Further optionally, the multiple search space sets are associated with the same control resource set CORESET index, or the multiple search space sets are associated with different CORESET indexes. Based on this implementation, the multiple search space sets are associated with the same CORESET index, and the N second candidate control channels can use the same CORESET configuration parameters, which can reduce the CORESET configuration signaling overhead. The plurality of search space sets are associated with different CORESET indexes, so that the network device can implement more flexibly.

Further optionally, the multiple search space sets correspond to the same DCI format. Based on this implementation, the same DCI can be transmitted in multiple sets of search spaces.

Further optionally, the detection periods of the multiple search space sets are the same, and the time slot offsets are different. Based on this implementation, the configuration signaling overhead of multiple search space sets can be saved.

According to the method described in the first aspect or the second aspect, in a possible implementation manner, the transmission configuration indication states corresponding to the N second candidate control channels are the same or different. Based on this implementation method, the transmission configuration indication states corresponding to the N second candidate control channels are the same, and the N second candidate control channels can be used for joint channel estimation, which can improve the channel estimation performance and further improve the DCI transmission performance; N second candidate control channels The transmission configuration indication states corresponding to the candidate control channels are different, which can obtain diversity gain and improve DCI transmission performance.

According to the method described in the first aspect or the second aspect, in a possible implementation manner, the N second candidate control channels occupy the same frequency domain positions and different time domain positions. Based on this implementation manner, a terminal device with a lower bandwidth capability can receive a candidate control channel with a high aggregation level sent by a network device.

According to the method described in the first aspect or the second aspect, in a possible implementation manner, the bandwidth occupied by the first candidate control channel in the frequency domain is the same as the bandwidth occupied by the second candidate control channel in the frequency domain. Based on this implementation manner, a terminal device with a lower bandwidth capability can receive a candidate control channel with a high aggregation level sent by a network device.

In a third aspect, the present application provides a data transmission method, the method includes: a network device determines downlink control information DCI, the DCI carries first information and second information, and the first information and the second information are used by the terminal The device determines the time domain resources of the first physical channel or reference signal scheduled by the DCI; the first information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time unit at which the DCI ends and the time when the first physical channel starts transmission The time interval between units, or, the second information is used to determine the time interval between the time unit when the DCI ends and the time unit when the reference signal starts to be transmitted; the network device sends the DCI to the terminal device. Based on this implementation manner, it is beneficial for the terminal device to more accurately determine the time-domain resource for DCI scheduling.

In a fourth aspect, the present application provides a data transmission method, the method comprising: a terminal device receives downlink control information DCI from a network device, the DCI carries first information and second information, and the first information is used to determine the DCI The end time unit, the second information is used to determine the time interval between the end time unit of the DCI and the time unit when the first physical channel starts transmission, or the second information is used to determine the end time unit of the DCI and the reference signal A time interval between time units for starting transmission; the terminal device determines the time-domain resource of the first physical channel or reference signal scheduled by the DCI according to the first information and the second information. For the beneficial effects corresponding to the method described in the fourth aspect, refer to the content described in the third aspect, and details are not repeated here.

In a fifth aspect, the present application provides a data transmission method, the method comprising: a network device determines at least one frequency position of an initial partial bandwidth BWP in a first direction; the network device sends configuration information to a terminal device, and the configuration information is used to configure The frequency position of at least one initial BWP in the first direction; the network device determines the frequency position of at least one initial BWP in the second direction according to the frequency position of at least one initial BWP in the first direction; the network device determines the frequency position of at least one initial BWP in the first direction according to the frequency position and The frequency position of at least one initial BWP in the second direction is communicated with the terminal device.

Based on the method described in the fifth aspect, since the configuration information only needs to contain the frequency position information used to determine the initial BWP in the first direction, it does not need to contain the frequency position information used to determine the initial BWP in the second direction, so configuration information can be saved signaling overhead.

In a possible implementation manner, the configuration information is used to indicate the number P of random access channel PRACH transmission opportunities and the starting positions of the P PRACH transmission opportunities in the frequency domain; For the frequency position of the initial BWP in the direction, this step specifically includes: the network device determines at least one frequency position of the initial BWP in the first direction according to the number P of PRACH transmission opportunities and the starting positions of the P PRACH transmission opportunities in the frequency domain .

In a possible implementation manner, the P PRACH transmission opportunities are frequency multiplexed.

In a possible implementation manner, a start position of one first direction initial BWP in the at least one first direction initial BWP in the frequency domain is the same as a start position of the P PRACH transmission opportunities in the frequency domain.

In a possible implementation manner, the frequency bandwidth occupied by one initial BWP in the first direction among the at least one initial BWP in the first direction is the same as the frequency bandwidth occupied by C PRACH transmission opportunities among the P PRACH transmission opportunities, where C is a positive integer less than or equal to P.

In a possible implementation manner, the P PRACH transmission opportunities are recorded as PRACH transmission opportunity 0, PRACH transmission opportunity 1,..., PRACH transmission opportunity P-1 in order of frequency from low to high, and the C PRACH transmission opportunities are C PRACH transmission opportunities starting from the PRACH transmission opportunity 0.

In a possible implementation manner, the starting position of one first direction initial BWP in the at least one first direction initial BWP in the frequency domain is equal to the frequency of the Fth PRACH transmission opportunity among the P PRACH transmission opportunities The starting position is the same, where F is a positive integer less than or equal to P.

In a possible implementation manner, the P PRACH transmission opportunities are recorded as PRACH transmission opportunity 0, PRACH transmission opportunity 1,..., PRACH transmission opportunity P-1 in order of frequency from low to high, and the Fth PRACH transmission opportunity is the PRACH transmission opportunity with index number F-1.

In a possible implementation manner, a frequency bandwidth occupied by one first-direction initial BWP among the at least one first-direction initial BWP is smaller than or equal to a maximum bandwidth supported by the terminal device.

In a possible implementation, the center frequency position of the initial BWP in the first direction is the same as the center frequency of the initial BWP in the second direction, and the number of PRBs of the initial BWP in the first direction is the same as that of the initial BWP in the second direction .

In a possible implementation manner, configuration information is carried in system information.

In a possible implementation manner, the first direction is uplink, and the second direction is downlink.

In a possible implementation manner, the first direction is downlink, and the second direction is uplink.

In a sixth aspect, the present application provides a method for data transmission. The terminal device receives configuration information sent by the network device, and the configuration information is used to configure at least one frequency position of the initial BWP in the first direction; the terminal device determines at least one frequency position according to the configuration information. The frequency position of the initial partial bandwidth BWP in the first direction; the terminal device determines the frequency position of at least one initial BWP in the second direction according to the frequency position of at least one initial BWP in the first direction; the terminal device determines the frequency position of at least one initial BWP in the first direction according to the frequency position and The frequency location of the initial BWP in at least one second direction is communicated with the network device.

For the beneficial effects corresponding to the method described in the sixth aspect, reference may be made to the content described in the fifth aspect, which will not be repeated here.

In a possible implementation, the configuration information is used to indicate the number P of random access channel PRACH transmission opportunities and the starting positions of the P PRACH transmission opportunities in the frequency domain; For the frequency position of the initial BWP in the direction, this step specifically includes: the terminal device determines at least one frequency position of the initial BWP in the first direction according to the number P of PRACH transmission opportunities and the starting positions of the P PRACH transmission opportunities in the frequency domain ;

In a seventh aspect, the present application provides a data transmission method, the method comprising: a network device determines a first initial uplink BWP, where the first initial uplink BWP is one of multiple initial BWPs; the network device sends indication information to the terminal device , the indication information is used to indicate the index of the first initial uplink BWP in the multiple initial uplink BWPs. Based on the method described in the seventh aspect, the network device indicates the first initial uplink BWP for the terminal device, which is more flexible. The terminal device performs random access based on the first initial uplink BWP by receiving the indicated first initial uplink BWP, which can improve Probability of random access success.

In a possible implementation manner, the indication information is carried in the first DCI.

Optionally, the cyclic redundancy check (CRC) of the first DCI is scrambled by using the cell radio network temporary identifier C-RNTI.

Optionally, the first DCI is used to trigger the random access process, and the first DCI also includes one or more of the following: random access preamble index, normal uplink/supplementary uplink UL/SUL indication, synchronization Signal and physical broadcast channel SS/PBCH index, random access channel PRACH mask index.

In a possible implementation manner, before the network device sends the indication information, the method further includes: the network device sends random access resource configuration information to the terminal device, and the random access resource configuration information includes A random access resource configuration information. Resource type configuration information, A does not exceed the number B of SSBs associated with one PRACH opportunity. Based on this implementation, on the one hand, it is beneficial to ensure that each type of random access resource has enough preambles to ensure the random access performance of terminal equipment, and on the other hand, it can reduce the random access resource overhead on the network side.

In an eighth aspect, the present application provides a method for data transmission, the method comprising: a terminal device receiving indication information sent by a network device, where the indication information is used to indicate the index of the first initial uplink BWP among the multiple initial uplink BWPs The terminal device determines the first initial uplink BWP based on the index of the first initial uplink BWP in the multiple initial uplink BWPs; the terminal device initiates random access to the network device based on the first initial uplink BWP.

For the beneficial effects corresponding to the method described in the eighth aspect, refer to the content described in the seventh aspect, and details are not repeated here.

In a possible implementation manner, before the terminal device receives the indication information sent by the network device, the method further includes: the terminal device receives random access resource configuration information sent by the network device, and the random access resource configuration information includes A The configuration information of the random access resource type, A does not exceed the number B of SSBs associated with a PRACH opportunity; the terminal device determines the random access resource corresponding to the terminal device type according to the random access resource configuration information; When the first initial uplink BWP initiates random access to the network device, this step specifically includes: the terminal device initiates random access to the network device according to the first initial uplink BWP and the random access resource corresponding to the terminal device type.

In a ninth aspect, the present application provides a communication device. The device may be a network device, or a device in the network device, or a device that can be matched with the network device. Wherein, the communication device may also be a system on a chip. The communication device may execute the method described in the first aspect, the third aspect, the fifth aspect or the seventh aspect. The functions of the communication device may be realized by hardware, or may be realized by executing corresponding software by hardware. The hardware or software includes one or more units or modules corresponding to the above functions. The unit or module can be software and/or hardware. For operations and beneficial effects performed by the communication device, reference may be made to the methods and beneficial effects described in the first aspect, the third aspect, the fifth aspect, or the seventh aspect, and repeated descriptions will not be repeated.

In a tenth aspect, the present application provides a communication device. The device may be a terminal device, or a device in the terminal device, or a device that can be matched with the terminal device. The communication device may execute the method described in the second aspect, the fourth aspect, the sixth aspect, or the eighth aspect. The functions of the communication device may be realized by hardware, or may be realized by executing corresponding software by hardware. The hardware or software includes one or more units or modules corresponding to the above functions. The unit or module can be software and/or hardware. For the operations and beneficial effects performed by the communication device, reference may be made to the methods and beneficial effects described in the second aspect, the fourth aspect, the sixth aspect, or the eighth aspect above, and repeated descriptions will not be repeated.

In the eleventh aspect, the present application provides a communication device, the communication device includes a processor, and when the processor calls the computer program in the memory, the method according to any one of the first aspect to the eighth aspect is executed implement.

In a twelfth aspect, the present application provides a communication device, the communication device includes a processor and a memory, and the processor and the memory are coupled; the processor is used to implement the method according to any one of the first aspect to the eighth aspect.

In a thirteenth aspect, the present application provides a communication device. The communication device includes a processor and an interface circuit. The signal is sent to other communication devices other than the communication device, and the processor implements the method according to any one of the first aspect to the eighth aspect through a logic circuit or executing code instructions.

In a fourteenth aspect, the present application provides a computer-readable storage medium, in which computer programs or instructions are stored. When the computer programs or instructions are executed by a communication device, any one of the first to eighth aspects can be realized. item method. In a fifteenth aspect, the present application provides a computer program product including instructions. When a computer reads and executes the computer program product, the computer executes the method according to any one of the first aspect to the eighth aspect.

Description of drawings

FIG. 1 is a schematic diagram of a resource structure of a resource unit group;

FIG. 2 is a schematic diagram of a control channel unit corresponding to a resource unit group provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of a candidate control channel provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of a set of search spaces provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of a communication system architecture provided in an embodiment of the present application;

FIG. 5A is a schematic diagram of a communication network architecture provided in an embodiment of the present application;

FIG. 5B is a schematic diagram of a communication network architecture provided in an embodiment of the present application;

FIG. 5C is a schematic diagram of a communication network architecture provided in an embodiment of the present application;

FIG. 6 is a schematic flowchart of a data transmission method provided in an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a first candidate control channel provided by an embodiment of the present application;

FIG. 8 is a schematic structural diagram of another first candidate control channel provided by an embodiment of the present application;

FIG. 9 is a schematic structural diagram of another first candidate control channel provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of another first candidate control channel provided by an embodiment of the present application;

FIG. 11 is a schematic structural diagram of another first candidate control channel provided by an embodiment of the present application;

Fig. 12 is a schematic diagram of a second information indication method provided by the embodiment of the present application;

Fig. 13 is a schematic flowchart of another data transmission method provided by the embodiment of the present application;

FIG. 14 is a schematic flowchart of another data transmission method provided by the embodiment of the present application;

FIG. 15 is a schematic diagram of frequency domain positions of a partial bandwidth provided by an embodiment of the present application;

FIG. 16 is a schematic flowchart of another data transmission method provided by the embodiment of the present application;

Fig. 17 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

Fig. 18 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 19 is a schematic structural diagram of a chip provided by an embodiment of the present application.

detailed description

The specific embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

The terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

In this application, "at least one (item)" means one or more, "multiple" means two or more, "at least two (items)" means two or three and three Above, "and/or" is used to describe the corresponding relationship between associated objects, indicating that there can be three kinds of relationships, for example, "A and/or B" can mean: only A exists, only B exists, and A and B exist simultaneously. A case where A and B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one item (piece) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c ", where a, b, c can be single or multiple.

In order to enable terminal devices with lower bandwidth capabilities to receive high-aggregation-level candidate Physical Downlink Control Channels (PDCCHs), this embodiment of the present application provides a data transmission method. The technical terms involved in this application are first described below. Make an introduction:

1. Subcarriers: In an Orthogonal Frequency-Division Multiplexing (OFDM) system, frequency domain resources are divided into several sub-resources, which can be called a sub-carrier. A subcarrier is the smallest granularity of frequency domain resources.

2. Subcarrier spacing: The subcarrier spacing refers to the interval value between the center positions or peak positions of two adjacent subcarriers in the frequency domain. For example, the subcarrier spacing in the long term evolution (LTE) system is 15kHz, and the subcarrier spacing in the New Radio (NR) system can be 15kHz, or 30kHz, or 60kHz, or 120kHz, etc.

3. Resource block: N consecutive subcarriers in the frequency domain may be called a resource block. For example, one resource block in the LTE system includes 12 subcarriers, and one resource block in the NR system also includes 12 subcarriers. With the evolution of the communication system, the number of subcarriers included in a resource block may also be other values.

4. OFDM symbol: The OFDM symbol is the smallest time unit in the time domain in the OFDM system.

5. Time slot (Slot): A time slot refers to a time unit in the time domain. A time slot in the NR system includes 14 OFDM symbols, the length of the time slot corresponding to the 15kHz sub-carrier spacing is 1ms, the length of the time slot corresponding to the 30kHz sub-carrier spacing is 0.5ms, and the length of the time slot corresponding to the 60kHz sub-carrier spacing is 0.25ms. The time slot length of 120kHz sub-carrier spacing is 0.125ms, and the time slot length of 240kHz sub-carrier spacing is 0.0625ms.

6. Downlink Control Information (DCI): DCI is carried by PDCCH and is used to schedule the location and size of time-frequency resources of physical channels or reference signals, or to indicate multi-antenna configuration information, etc.

7. Control-resource set (CORESET): CORESET is a set of physical resources, consisting of multiple physical resource blocks (Physical Resource Block, PRB) in the frequency domain and 1 to 3 OFDM symbols in the time domain , the time-frequency resource size and time-frequency position occupied by CORESET can be semi-statically configured according to the high-level parameters.

8. Resource-element group (Resource-element group, REG): REG is a physical resource unit that occupies one OFDM symbol in the time domain and one resource block in the frequency domain. Wherein, one REG includes 12 resource elements (resource element, RE). As shown in FIG. 1 , among the 12 REs, 3 REs are used to map PDCCH demodulation reference signals, and the other 9 REs are used to map DCI REs. Wherein, the REs used for mapping the PDCCH demodulation reference signal are evenly distributed in the REG, and are located in subcarriers numbered 1, 5, and 9 in the REG.

Nine, control channel element (Control-channel element, CCE): CCE is the basic unit that constitutes the PDCCH. One CCE corresponds to 6 REGs. Each CCE in the CORESET will have a corresponding index number, and each CCE index number will have a corresponding relationship with the index numbers of the 6 REGs to which it is mapped. For example, as shown in Figure 2, a CORESET contains 24 REGs, among which REGs with index numbers 0-5 correspond to CCE1, REGs with index numbers 6-11 correspond to CCE2, REGs with index numbers 12-17 correspond to CCE3, and REGs with index numbers 18-17 correspond to CCE3. The REG of 23 corresponds to CCE4. In addition to the above description, there may be other correspondence between the index number of the REG and the index number of the CCE, which is not limited in this embodiment of the present application.

10. Aggregation level (Aggregation level, AL): AL refers to the number of CCEs that make up the PDCCH, that is, a PDCCH is composed of K CCEs, and the aggregation level of the PDCCH is K. The high aggregation level PDCCH described in this application means that the aggregation level K of the PDCCH is relatively large, and the low aggregation level PDCCH described in this application means that the aggregation level K of the PDCCH is relatively small. For example, if the aggregation level of the first PDCCH is K, and the aggregation level of the second PDCCH is M, where K is greater than M, it can be described that the first PDCCH is a PDCCH with a high aggregation level, the second PDCCH is a PDCCH with a low aggregation level, and the first PDCCH The aggregation level of is higher than the aggregation level of the second PDCCH. In the NR system, the aggregation level supported by the PDCCH is 1, 2, 4, 8 or 16.

11. Candidate PDCCH (PDCCH candidate): The candidate PDCCH refers to the PDCCH to be blindly detected. Since the aggregation level of the PDCCH actually sent by the base station changes with time, and since there is no relevant signaling to inform the terminal device of the aggregation level of the currently transmitted PDCCH and the type of information currently transmitted, the terminal device needs to blindly detect the PDCCH with different aggregation levels. For example, the terminal device detects that the current CCE0 is a candidate PDCCH with an aggregation level of 1. If the detection is successful, it determines that the current CCE0 is a candidate PDDCH with an aggregation level of 1. If the detection fails, it uses the current CCE0 and CCE1 as the candidate PDDCH with an aggregation level of 2. If the detection is successful, the current CCE0 and CCE1 are determined to be candidate PDDCHs with an aggregation level of 2; if the detection fails, the detection is continued in this way. Wherein, the detection manner is only an example of the present application, and the terminal device may also perform detection in other manners, which is not limited in the present application. The verification method of the terminal device on the candidate PDCCH is cyclic redundancy check (Cyclic Redundancy Check). If the verification is passed, the content of the decoded PDCCH is considered valid for the terminal device, and the decoded related information is processed.

12. Search space (Search space): The search space refers to the set of candidate PDCCHs under a certain aggregation level. For example, as shown in Figure 3, the CORESET contains multiple candidate PDCCHs of aggregation levels, CCE0 is a candidate PDCCH of aggregation level 1, CCE2 and CCE3 form a candidate PDCCH of aggregation level 2, and CCE4 to CCE7 form a candidate PDCCH of aggregation level 2. 4 candidate PDDCHs, CCE8-CCE15 form candidate PDDCHs with an aggregation level of 8, where the first search space is the set of candidate PDCCHs with an aggregation level of 1, and the second search space is the set of candidate PDCCHs with an aggregation level of 2. The third search space is a set of candidate PDCCHs whose aggregation level is 4, and the fourth search space is a set of candidate PDCCHs whose aggregation level is 8.

Thirteen. Search space set: A search space set refers to a set that includes multiple search spaces. In the NR system, the network device can configure one or more search space sets for the terminal device, and the terminal device can receive and parse the DCI carried in the candidate PDCCH in the search space set. There are two types of search space sets, one is the common search space set (Common Search Space Set, CSS set), and the other is the user terminal-specific search space set (UE-specific Search Space Set, USS set). The PDCCH of the common search space set is mainly used to indicate the reception of system messages, random access responses, and paging messages, etc., and the PDCCH of the UE-specific search space set is used to indicate the uplink/downlink data scheduled by the network equipment. The configuration information of the search space set is shown in Table 1:

Table 1

Exemplarily, as shown in FIG. 4, FIG. 4 is a schematic diagram of a search space set provided in the embodiment of the present application. The detection period of the search space set is 5 slots, the time slot offset is 1 slot, and the number of time slots is 1 slot, the control resource set index corresponds to a CORESET occupying 3 OFDM symbols, and the symbol positions are OFDM symbol 0 and OFDM symbol 5 in Slot 1. That is, every 10 slots of the terminal device is a detection cycle, and the candidate PDCCH is detected on the CORESET corresponding to OFDM symbol 0-OFDM symbol 2 and OFDM symbol 5-OFDM symbol 7 in Slot 1 in the detection cycle.

The system architecture of the embodiment of the present application is introduced below:

In order to facilitate understanding of the technical solutions of the embodiments of the present application, the system architecture of the method provided by the embodiments of the present application will be briefly described below. It can be understood that the system architecture described in the embodiments of the present application is for more clearly illustrating the technical solutions of the embodiments of the present application, and does not constitute a limitation on the technical solutions provided by the embodiments of the present application.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as satellite communication systems and traditional mobile communication systems. Wherein, the satellite communication system may be integrated with a traditional mobile communication system (ie, a ground communication system). Communication systems such as: wireless local area network (wireless local area network, WLAN) communication system, wireless fidelity (wireless fidelity, WiFi) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) ) system, LTE time division duplex (time division duplex, TDD), fifth generation (5th generation, 5G) system or new radio (new radio, NR), sixth generation (6th generation, 6G) system, and other future Communication systems, etc., also support communication systems that integrate multiple wireless technologies. For example, they can also be applied to non-terrestrial networks such as unmanned aerial vehicles, satellite communication systems, and high altitude platform station (HAPS) communications. NTN) is a system that integrates terrestrial mobile communication networks.

FIG. 5 is an example of a communication system applicable to the embodiment of the present application. The communication system includes at least one network device and at least one terminal device. Referring to Figure 5, it includes network equipment and 6 terminal equipment. The 6 terminal devices may be cellular phones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs and/or any other suitable devices for communicating over a wireless communication system, And can be connected with network equipment. These six terminal devices are all capable of communicating with network devices. Of course, the number of terminal devices in FIG. 5 is just an example, and may be less or more.

The network equipment in this application can be an evolved base station (evolved Node B, eNB or eNodeB) in LTE; or a base station in a 5G network, a broadband network gateway (broadband network gateway, BNG), an aggregation switch or a non-third-generation The partner project (3rd generation partnership project, 3GPP) access device and the like are not specifically limited in this embodiment of the present application. Exemplarily, the base stations in this embodiment of the present application may include various forms of base stations, such as: macro base stations, micro base stations (also called small stations), relay stations, access points, next-generation base stations (gNodeB, gNB), transmission Access point (transmitting and receiving point, TRP), transmitting point (transmitting point, TP), mobile switching center and device-to-device (Device-to-Device, D2D), vehicle outreach (vehicle-to-everything, V2X) , machine-to-machine (machine-to-machine, M2M) communication, Internet of Things (Internet of Things) communication, devices that undertake base station functions, etc., are not specifically limited in this embodiment of the present application.

Network devices can communicate and interact with core network devices to provide communication services to terminal devices. The core network device is, for example, a device in a 5G network core network (core network, CN). As a bearer network, the core network provides an interface to the data network, and provides communication connection, authentication, management, policy control, and bearer for data services for user equipment (UE). Network devices are connected to core network devices through wireless or wired methods. Core network equipment and network equipment can be independent and different physical equipment; or the functions of the core network equipment and the logical functions of the network equipment are integrated on the same physical equipment; or the functions of part of the core network equipment and the functions of some network equipment integrated on the same physical device.

The terminal equipment mentioned in the embodiment of the present application may be a device with a wireless transceiver function, and specifically may refer to user equipment (user equipment, UE), access terminal, subscriber unit (subscriber unit), subscriber station, mobile station (mobile station), remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device. The terminal device may also be a satellite phone, a cellular phone, a smartphone, a wireless data card, a wireless modem, a machine type communication device, may be a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (wireless local loop) loop, WLL) station, personal digital assistant (PDA), handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, vehicle-mounted device, communication device carried on high-altitude aircraft, wearable Devices, drones, robots, devices in device-to-device (D2D), terminals in vehicle to everything (V2X), virtual reality (VR) terminals, Augmented reality (augmented reality, AR) terminal equipment, wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical, smart grid ), wireless terminals in transportation safety, wireless terminals in smart city, wireless terminals in smart home or terminal equipment in future communication networks, etc., this application No limit.

In addition, in this embodiment of the present application, a terminal device may refer to a device for implementing a terminal function, or may be a device capable of supporting a terminal device to implement the function, such as a chip system, and the device may be installed in the terminal device. For example, the terminal device can also be a vehicle detector, a sensor in a gas station.

FIG. 5A shows a communication network architecture in the communication system provided by the present application, and the embodiments provided later can all be applicable to this architecture. The first network device is a source network device (or called, a working network device, or a serving network device) of a terminal device (subsequently described with UE as an example), and the second network device is a target network device (or called, Standby network device), that is, a network device that provides services for the UE after handover. "Handover" refers to the handover of network equipment providing services for the UE, and is not limited to "cell handover". For convenience of description, a network device is used as an example for description. The "handover" may refer to a handover caused by a change in the base station serving the UE. For example, when the source base station of the UE fails, the standby base station provides services for the UE. For another example, during the handover process of the UE from the source base station to communicating with another base station, the handover target base station provides services for the UE. The cell accessed by the UE before and after the handover may be changed or not changed. It can be understood that the backup network device is a relative concept, for example, with respect to one UE, base station 2 is the backup network device of base station 1, and with respect to another UE, base station 1 is the backup network device of base station 2.

The first network device and the second network device may be two different devices, for example, the first network device and the second network device are two different base stations. Exemplarily, the first network device and the second network device may also be two sets of functional modules in the same device. The functional modules may be hardware modules, or software modules, or hardware modules and software modules. For example, the first network device and the second network device are located in the same base station, and are two different functional modules in the base station. In an implementation manner, the first network device and the second network device are not transparent to the UE. When the UE interacts with the corresponding network device, it can know which network device it is interacting with. In another implementation manner, the first network device and the second network device are transparent to the UE. The UE is able to communicate with network devices, but does not know which of the two network devices it is interacting with. In other words, for the UE, it may be considered that there is only one network device. In the subsequent description, the network device may be the first network device or the second network device.

FIG. 5B shows another communication network architecture in the communication system 10 provided by the present application. As shown in FIG. 5B, the communication system includes a core network (new core, CN) and a radio access network (radio access network, RAN). The network equipment (for example, base station) in the RAN includes a baseband device and a radio frequency device. The baseband device can be implemented by one or more nodes, and the radio frequency device can be remote from the baseband device and implemented independently, or can be integrated into the baseband device, or partly remote and partly integrated into the baseband device. Network devices in the RAN may include a Centralized Unit (CU) and a Distributed Unit (DU), and multiple DUs may be centrally controlled by one CU. CU and DU can be divided according to their wireless network protocol layer functions. For example, the functions of the PDCP layer and above protocol layers are set in the CU, and the protocol layers below PDCP, such as the functions of the RLC layer and MAC layer, are set in the DU. It should be noted that the division of such protocol layers is only an example, and may also be divided in other protocol layers. The radio frequency device can be remote, not placed in the DU, or integrated in the DU, or partially remote and partially integrated in the DU, which is not limited in this application.

FIG. 5C shows another communication network architecture in the communication system 10 provided by the present application. Compared with the architecture shown in Figure 5B, the control plane (CP) and user plane (UP) of the CU can also be separated into different entities for implementation, namely the control plane CU entity (CU-CP entity) and the user plane CU entity (CU-UP entity). In this network architecture, the signaling generated by the CU can be sent to the UE through the DU, or the signaling generated by the UE can be sent to the CU through the DU. The DU can directly transmit the signaling to the UE or CU through protocol layer encapsulation without parsing the signaling. In this network architecture, a CU is classified as a network device on the RAN side. In addition, a CU may also be classified as a network device on the CN side, which is not limited in this application.

In the embodiment of the present application, the device used to realize the function of the network device may be a network device, or a device capable of supporting the network device to realize the function, such as a chip system or a combined device or component that can realize the function of the network device. Can be installed in network equipment. In the technical solution provided by the embodiment of the present application, the technical solution provided by the embodiment of the present application is described by taking the network device as an example for realizing the function of the network device.

The data transmission method and communication device provided by this application are introduced in detail below:

Please refer to FIG. 6. FIG. 6 is a schematic flowchart of a data transmission method provided by an embodiment of the present application. As shown in FIG. 6 , the data transmission method includes the following steps 601 to 603 . The execution bodies of the method shown in FIG. 6 may be network devices and terminal devices. Alternatively, the execution subject of the method shown in FIG. 6 may be a chip in the network device and a chip in the terminal device. FIG. 6 uses a network device and a terminal device as examples for illustration. The execution subject of the subsequent flow chart is the same, and will not be repeated in the future. in:

601. The network device determines a first candidate control channel.

In the example of this application, the first candidate control channel is composed of N second candidate control channels, the aggregation level of the first candidate control channel is K, the aggregation level of the second candidate control channel is M, N is greater than 1, and M is less than K.

Among them, the bandwidth occupied by the candidate control channel with the aggregation level K in the frequency domain can be calculated according to the formula

Calculation. K represents the aggregation level of the candidate control channel, N ₁ represents the number of REGs corresponding to 1 CCE in the candidate control channel, in the NR system, 1 CCE corresponds to 6 REGs, and N ₂ represents the REs contained in 1 REG quantity. In the NR system, 1 REG contains 12 REs, S represents the current subcarrier spacing, and n represents the number of OFDM symbols occupied by the CORESET carrying the candidate control channel. For example, assuming that the subcarrier spacing is 30kHz and CORESET occupies 3 OFDM symbols in the time domain, calculated according to the above formula, the bandwidths occupied by candidate PDCCHs with aggregation levels 8 and 16 in the frequency domain are 5.76MHz and 11.52MHz respectively. Therefore, the larger K is, the larger the bandwidth occupied by the candidate control channel is. Since the first candidate control channel received by the terminal device is composed of N second candidate control channels, and the aggregation level of the second candidate control channel is M, M is smaller than K. Therefore, based on this method, terminal devices with low bandwidth capabilities can receive candidate control channels with a high aggregation level.

Wherein, both the first candidate control channel and the second candidate control channel may be PDCCH candidates (PDCCH candidates).

In a possible implementation manner, K is greater than the first threshold. The first threshold may be a preset value, or the first threshold is configured by the network device, or the first threshold is associated with the bandwidth capability of the terminal device. By setting the first threshold, it can be avoided that the first candidate control channel whose aggregation level is less than or equal to the first threshold is still split when the terminal device with low bandwidth capability can receive the first candidate control channel whose aggregation level is less than or equal to the first threshold. Divided into multiple second candidate control channels, so that the DCI transmission delay increases. For example, assuming that the channel bandwidth supported by the current terminal equipment is 5MHz, when the subcarrier spacing is 15kHz, and CORESET occupies 3 OFDM symbols in the time domain, according to the calculation, the terminal equipment can receive candidate control channels whose aggregation level is less than 13, that is, in In the NR system, a terminal device can receive candidate control channels with

aggregation levels

1, 2, 4 and 8. Therefore, in this case, the first candidate control channels with aggregation levels of 2, 4 and 8 do not need to be composed of multiple second candidate control channels, and the network device can directly send them. Therefore, based on this method, the network implementation is more flexible, the network device can finish sending the DCI as soon as possible, the terminal device can receive the DCI as soon as possible, and the DCI transmission delay is reduced.

Optionally, the first threshold may be a preset value, or configured by a network device. This embodiment of the present application does not limit how to configure the first threshold.

In a possible implementation, N, M and K satisfy:

or

in,

represents the round-up operator,

Represents the floor operator. Since the first candidate control channel with an aggregation level of K is composed of N second candidate control channels with an aggregation level of M, based on this method, terminal devices with low bandwidth capabilities can receive candidate control channels with a high aggregation level. channel.

Optionally, N may also be a preset value, or be configured by a network device, and how to configure the size of N is not limited in this embodiment of the present application.

In a possible implementation manner, the N second candidate control channels belong to the same search space set. Wherein, the N second candidate control channels are located in the same time slot, or the N second candidate control channels are located in different time slots. Based on this method, the N second candidate control channels can use the same search space set configuration parameters, which can reduce the signaling overhead of the search space set configuration.

If the N second candidate control channels are located in the same time slot, the N second candidate control channels may occupy discontinuous OFDM symbols in the same time slot. For example, as shown in Figure 7, the detection period of the search space set is 5 slots, the time slot offset is 1 slot, and the number of time slots is 1 slot, and the starting symbol position of the CORESET associated with the search space set is 0 and 5, CORESET occupies 3 OFDM symbols. Among them, the CORESET corresponding to OFDM symbols 0 to 2 in Slot 1 contains CCE0 to CCE3, the CORESET corresponding to OFDM symbols 5 to 7 contains CCE4 to CCE7, and CCE0 to CCE3 are combined into a second aggregation level of 4. candidate control channel. CCE4-CCE7 are combined into a second candidate control channel with aggregation level 4, and the first candidate control channel with aggregation level 8 is composed of these two second candidate control channels with aggregation level 4. Based on this method, N second candidate control channels occupy continuous OFDM symbols in the same time slot, which can reduce the DCI transmission delay,

If the N second candidate control channels are located in the same time slot, the N second candidate control channels may also occupy consecutive OFDM symbols in the same time slot. For example, as shown in Figure 8, the detection period of the search space set is 5 slots, the time slot offset is 1 slot, and the number of time slots is 1 slot, and the starting symbol position of the CORESET associated with the search space set is 0 and 3, the CORESET occupies 3 OFDM symbols. The CORESET corresponding to OFDM symbols 0-2 includes CCE0-CCE3, and the CORESET corresponding to OFDM symbols 3-5 includes CCE4-CCE7. CCE0~CCE3 are combined into a second candidate control channel with aggregation level 4, CCE4~CCE7 are combined into a second candidate control channel with aggregation level 4, and the first candidate control channel with aggregation level 8 is composed of these two aggregation levels is composed of 4 second candidate control channels. Based on this method, the N second candidate control channels occupy discontinuous OFDM symbols in the same time slot, which can prevent the downlink channel from being occupied by terminal equipment with low bandwidth capability for a long time, and the network equipment can use the non-consecutive OFDM symbols in the same time slot. The OFDM symbols occupied by the N second candidate control channels are allocated to other terminal devices for use.

If the N second candidate control channels are located in different time slots, the N second candidate control channels are located in consecutive time slots. For example, as shown in Figure 9, the detection period of the search space set is 5 slots, the time slot offset is 1 slot, and the number of time slots is 2 slots, and the starting symbol position of the CORESET associated with the search space set is 0, the CORESET occupies 3 OFDM symbols. The CORESET corresponding to OFDM symbols 0 to 2 in Slot 1 includes CCE0 to CCE3, and the CORESET corresponding to OFDM symbols 0 to 2 in Slot 2 includes CCE4 to CCE7. CCE0~CCE3 are combined into a second candidate control channel with aggregation level 4, CCE4~CCE7 are combined into a second candidate control channel with aggregation level 4, and the first candidate control channel with aggregation level 8 is composed of these two aggregation levels is composed of 4 second candidate control channels. Based on this method, the N second candidate control channels are located in different time slots, which can prevent the downlink channel from being occupied by terminal equipment with low bandwidth capability for a long time, and the network device can allocate OFDM symbols that are not occupied by the N second candidate control channels. for other terminal equipment. DCI transmission delay can be reduced by constraining the N second candidate control channels to be located in consecutive time slots.

In another possible implementation manner, the N second candidate control channels belong to multiple search space sets. Wherein, the detection periods of the multiple search space sets are the same, and the time slot offsets are different. For example, as shown in Figure 10, the detection periods of the first search space set and the second search space set are 4 slots, the number of time slots is 1 slot, and the start symbol positions of the associated CORESETs are both 0, and The associated CORESETs each occupy 3 OFDM symbols. However, the offset of the first slot in the first search space is 1 slot, and the offset of the second slot in the second search space is 3 slots. The CORESET corresponding to OFDM symbols 0-2 in Slot 1 in the first search space includes CCE0-CCE3, and the CORESET corresponding to OFDM symbols 0-2 in Slot 3 in the second search space includes CCE4-CCE7. CCE0~CCE3 are combined into a second candidate control channel with aggregation level 4, CCE4~CCE7 are combined into a second candidate control channel with aggregation level 4, and the first candidate control channel with aggregation level 8 is composed of these two aggregation levels is composed of 4 second candidate control channels. Based on this method, the configuration signaling overhead of multiple search space sets can be saved.

Optionally, the multiple search space sets are associated with the same CORESET index, or the multiple search space sets are associated with different CORESET indexes. The CORESET index includes 0 to 11, where CORESET0 is the public search space. If multiple search space sets are associated with the same CORESET index, the N second candidate control channels can use the same CORESET configuration parameters, which can reduce the CORESET configuration signaling overhead; if multiple search space sets are associated with different CORESET indexes, the network device implements more flexible.

Optionally, the multiple search space sets correspond to the same DCI format (DCI format). Different types of DCI, such as scheduling uplink/downlink data transmission instructions, power control commands, time slot format instructions, and resource preemption instructions, usually correspond to different DCI formats. Therefore, DCI is divided into different formats according to the type of indication information, and each format corresponds to a DCI payload size (DCI payload size, that is, the number of source bits carried by DCI) or a resolution method. When configuring the search space set, the base station will configure the DCI format of the search space set, for example, Format 0_1/1_1. Based on this method, the same DCI can be transmitted in multiple sets of search spaces.

In a possible implementation manner, the transmission configuration indication states (Transmission Configuration Indication state, TCI state) corresponding to the N second candidate control channels are the same or different. TCI state is used to indicate the approximate positioning relationship parameters between the demodulation reference signal (Demodulation Reference Signal, DMRS) antenna port and the downlink reference signal. The downlink reference signal can be a channel state information reference signal (Channel State Information-Reference Signal, CSI- RS) or synchronization signal block (Synchronization Signal and PBCH block, SSB), etc., the approximate positioning relationship is a channel condition assumption (quasi co-location, QCL). The terminal device can determine the receiving beam information corresponding to the sending beam used for data transmission according to the TCI state, so as to use the corresponding receiving beam to receive the data delivered by the network device. Based on this method, the transmission configuration indication states corresponding to the N second candidate control channels are the same, and the N second candidate control channels can be used for joint channel estimation, which can improve the channel estimation performance and further improve the DCI transmission performance; the N second candidate control channels The transmission configuration indication state corresponding to the control channel is different, which can obtain diversity gain and improve DCI transmission performance.

In a possible implementation manner, the N second candidate control channels occupy the same frequency domain positions and different time domain positions. For example, as shown in Figure 7, the first candidate control channel with an aggregation level of 8 is composed of two second candidate control channels with an aggregation level of 4. Since the two second candidate control channels are all in the CORESET corresponding to the same search space Therefore, the frequency domain positions occupied by the two second candidate control channels are the same. However, since the OFDM symbols corresponding to one second candidate control channel are 0-2, and the OFDM symbols corresponding to the other second candidate control channel are 5-7, the time domain positions occupied by the two second candidate control channels are different. Based on this method, it is beneficial to enable terminal devices with low bandwidth capabilities to receive candidate control channels with a high aggregation level.

In a possible implementation manner, the bandwidth occupied by the first candidate control channel in the frequency domain is the same as the bandwidth occupied by the second candidate control channel in the frequency domain. For example, when the frequency domain positions occupied by the N second candidate control channels are the same, the bandwidth occupied by the first candidate control channel in the frequency domain is the same as the bandwidth occupied by the second candidate control channel in the frequency domain. Based on this method, it is beneficial to enable terminal devices with low bandwidth capabilities to receive candidate control channels with a high aggregation level.

In another possible implementation manner, the bandwidth occupied by the first candidate control channel in the frequency domain is different from the bandwidth occupied by the second candidate control channel in the frequency domain. For example, as shown in Figure 11, the detection period of the search space set is 5 slots, the time slot offset is 1 slot, and the number of time slots is 2 slots. The starting symbol position of the CORESET associated with the search space set is 0 , the CORESET occupies 3 OFDM symbols. The CORESET corresponding to OFDM symbols 0 to 2 in Slot 1 includes CCE0 to CCE3, and CCE0 to CCE3 form two second candidate control channels with an aggregation level of 2. Wherein, CCE0 and CCE1 form a second candidate control channel whose aggregation level is 2, and CCE2 and CCE3 form another second candidate control channel whose aggregation level is 2. The CORESET corresponding to OFDM symbols 0 to 2 in Slot 2 includes CCE4 to CCE7, and CCE4 to CCE7 form two second candidate control channels with an aggregation level of 2. Wherein, CCE4 and CCE5 form a second candidate control channel whose aggregation level is 2, and CCE6 and CCE7 form another second candidate control channel whose aggregation level is 2. Therefore, the first candidate control channel with an aggregation level of 8 is composed of the four second candidate control channels with an aggregation level of 2. In this case, the bandwidth occupied by the first candidate control channel in the frequency domain is the same as the bandwidth occupied by the two second candidate control channels in the frequency domain. Therefore, the bandwidth occupied by the first candidate control channel in the frequency domain and The bandwidths occupied by the second candidate control channels in the frequency domain are different. Since the bandwidth occupied by two candidate control channels with a candidate level of 2 is smaller than the bandwidth occupied by one candidate control channel with an aggregation level of 8, based on this method, it is beneficial for terminal devices with lower bandwidth capabilities to receive high aggregation Class candidate control channels.

602. The network device sends downlink control information DCI to the terminal device.

In this embodiment of the present application, the network device sends downlink control information DCI to the terminal device on the first candidate channel, wherein the DCI carries first information and second information, and the first information and the second information are used by the terminal device to determine the Time-domain resources of the first physical channel or reference signal scheduled by the DCI. The first information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts transmission, or the second information It is used to determine the time interval between the time unit when the DCI ends and the time unit when the reference signal starts to be transmitted. Since the time-domain resource corresponding to the first candidate control channel is not necessarily in only one time slot, the end time unit and the start time unit of the DCI are not necessarily the same time slot. For example, when the first candidate control channel is composed of N second candidate control channels, and the N second candidate control channels are not in the same time slot, the start time unit and end time of the DCI carried by the first candidate control channel The time unit is not the same slot. If the DCI only carries the second information and does not carry the first information, when the terminal device parses the DCI, it will not be able to determine whether the time unit where the current DCI is located is the end time unit of the DCI, and the time domain resources determined by the terminal device It may be inconsistent with the time domain resource actually configured by the network device. However, the first indication information in this application is used to indicate the end time unit of the DCI, which avoids the inconsistency between the network device and the terminal device in understanding the time domain resources scheduled by the DCI, and helps the terminal device to more accurately determine the time domain resource scheduled by the DCI. time domain resources.

It should be noted that the time unit in this embodiment may be a time slot, a subframe, an OFDM symbol or a frame. In the NR system, the duration of a subframe is 1 millisecond (ms), and the duration of a frame is 10 milliseconds (ms). For the normal cyclic prefix, one slot contains 14 OFDM symbols, and for the extended cyclic prefix, one slot contains 12 OFDM symbols.

In a possible implementation manner, when the time unit is a time slot, the DCI may further include third information, and the third information is used to indicate the starting point of the OFDM symbol occupied by the first physical channel or the reference signal in one time slot. The starting position and the number of OFDM symbols occupied in one slot. The third information may be independently indicated, that is, the DCI includes an independent field carrying the third information, and this field does not carry the first information and/or the second information. In addition, the third information may also be jointly indicated with the first information or the second information, or the third information may be jointly indicated with the first information and the second information, that is, the DCI contains a field that can carry the third information , and the first message and/or the second message.

Exemplarily, as shown in FIG. 12 , the first candidate control channel corresponding to the search space set carries DCI. It is assumed that the network device sends DCI on the first candidate control channel, and the DCI indicates the time domain resource for scheduling the first physical channel. position, the first candidate control channel consists of two second candidate control channels. If the DCI only carries the second information, the terminal device will misjudge that the end time unit of the DCI is Slot 1 when parsing the DCI carried by the second candidate control channel corresponding to Slot 1. The second information indicates that the time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts transmission is 2 slots. Therefore, the terminal device will determine that the time domain position corresponding to the first physical channel scheduled by the DCI is Slot 3. However, in fact, the time domain resource actually allocated by the network device to the terminal device for transmitting the first physical channel is Slot 4, and there is an inconsistency between the time domain resource determined by the terminal device and the time domain resource actually configured by the network device. If the method described in this application is adopted, that is, the DCI carries the first information and the second information, according to the first information, it can be determined that the end time unit of the DCI is Slot2, and according to the second information, it can be determined that the end time unit of the DCI and The time interval between the time units when the first physical channel starts to transmit is 2 slots, therefore, the terminal device can accurately determine that Slot 4 is the time domain resource of the first physical channel scheduled by the DCI. Based on this method, it is beneficial for the terminal equipment to accurately determine the time-domain resources for DCI scheduling.

Wherein, the first physical channel may be a physical channel such as a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH), a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) or a physical uplink control channel (Physical Uplink Control Channel, PUCCH), This embodiment of the present application does not limit it. The reference signal may be a tracking reference signal (Tracking Reference Signal, TRS), SSB, CSI-RS, sounding reference signal (Sounding Reference Signal, SRS) and other signals. Optionally, the reference signal may be an aperiodic reference signal, for example, the reference signal may be an aperiodic TRS, aperiodic CSI-RS, aperiodic SRS, or aperiodic SSB signal. This application is not limited to this.

Optionally, the first information indicates the aggregation level of the first candidate control channel. The terminal device may determine whether the time slot where the current DCI is located is the end time unit of the DCI according to the aggregation level of the first candidate control channel. For example, the terminal device may determine that the aggregation level of the first candidate control channel is K according to the first information, and if the terminal device receives the Lth aggregation level of the second candidate control channel M, the value of L×M is less than K , the terminal device can determine that the time slot where the current DCI is located is not the end time unit of the DCI, if the terminal device receives the Nth aggregation level M second candidate control channel, the value of N×M is greater than or equal to K , the terminal device may determine that the time slot where the current DCI is located is the end time unit of the DCI. This method is only an example proposed in this application, and this application does not limit the method of how the terminal device determines the DCI end time unit according to the aggregation level corresponding to the first candidate control channel.

Optionally, the first information indicates the ending slot number of the DCI. The terminal device can directly determine the end time unit of the DCI according to the end slot number of the DCI.

603. The terminal device determines, according to the DCI, time-domain resources of the first physical channel or reference signal scheduled by the DCI.

In a possible implementation manner, the manner in which the terminal device determines the time-domain resources of the first physical channel or reference signal scheduled by DCI may be: the terminal device determines the first physical channel resource of the DCI schedule according to the first information and the second information. Time domain resource of channel or reference signal. Based on this method, it is beneficial for the terminal equipment to accurately determine the time-domain resources for DCI scheduling.

Please refer to FIG. 13 . FIG. 13 is a schematic flowchart of a data transmission method provided by an embodiment of the present application. As shown in FIG. 13 , the data transmission method includes the following steps 1301 to 1303 .

1301. The network device determines downlink control information DCI.

In the embodiment of the present application, the DCI carries first information and second information, and the first information and the second information are used by the terminal device to determine the time-domain resource of the first physical channel or the reference signal scheduled by the DCI. The first information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts transmission, or the second information It is used to determine the time interval between the time unit when the DCI ends and the time unit when the reference signal starts to be transmitted. Since the time domain resource corresponding to the first candidate control channel is not necessarily only in one time slot, the end time unit and start time unit of DCI are not necessarily the same time slot. For example, when the first candidate control channel consists of N The second candidate control channel is composed, and when the N second candidate control channels are not in the same time slot, the start time unit and end time unit of the DCI carried by the first candidate control channel are not in the same time slot. If the DCI only carries the second information and does not carry the first information, when the terminal device parses the DCI, it will not be able to determine whether the time unit where the current DCI is located is the end time unit of the DCI, and the time domain resources determined by the terminal device It may be inconsistent with the time domain resource actually configured by the network device. However, the first indication information in this application is used to indicate the end time unit of the DCI, which avoids the inconsistency between the network device and the terminal device in understanding the time domain resources scheduled by the DCI, and helps the terminal device to more accurately determine the time domain resource scheduled by the DCI. time domain resources. For a specific example, reference may be made to the example described in step 602 above, and details are not described here in this embodiment of the present application.

It should be noted that the time unit in this embodiment may be a time slot, a subframe, an OFDM symbol or a frame. The time unit is the same as the time unit described in step 602 above, and details are not described here in this embodiment of the present application.

In a possible implementation, if the time unit is a time slot, the DCI may also include third information, which is the same as the third information described in step 602 above. I won't go into details.

1302. The network device sends DCI.

In a possible implementation manner, the network device sends DCI on a first candidate control channel, where the first candidate control channel is composed of N second candidate control channels, the aggregation level of the first candidate control channel is K, and the first The aggregation level of the two candidate control channels is M, N is greater than 1, and M is less than K. For a specific implementation manner, reference may be made to the description in the method embodiment corresponding to FIG. 6 , and details are not repeated in this embodiment of the present application.

1303. The terminal device determines, according to the first information and the second information, time-domain resources of the first physical channel or reference signal scheduled by the DCI.

In the embodiment of the present application, the first physical channel may be a physical channel such as PDSCH, PUSCH, or PUCCH, which is not limited in the embodiment of the present application. The reference signal may be a tracking reference signal (Tracking Reference Signal, TRS), CSI-RS, SRS, SSB and other signals. Optionally, the reference signal may be an aperiodic reference signal, for example, the reference signal may be an aperiodic TRS, aperiodic CSI-RS, aperiodic SRS, or aperiodic SSB signal. This application is not limited to this.

When the network device configures the initial uplink bandwidth part (BWP) and the initial downlink BWP for the terminal device, it will send system information to the terminal device, and the system information will carry the configuration information of the initial uplink BWP and the initial downlink BWP. In this way, the signaling overhead of the system information sent by the network device will be relatively large, which will affect the performance of the system information. In order to further reduce signaling overhead of system information, the present application proposes a data transmission method, as shown in FIG. 14 , which is a schematic flowchart of a data transmission method provided in an embodiment of the present application. The data transmission method includes the following steps 1401 to 1407.

1401. The network device determines a frequency position of at least one initial partial bandwidth BWP in the first direction.

In a possible implementation manner, the manner in which the network device determines the frequency position of at least one initial BWP in the first direction may be as follows: the network device determines the number P of transmission opportunities of the physical random access channel (Physical Random Access Channel, PRACH) and The starting positions of the P PRACH transmission opportunities in the frequency domain determine the frequency position of at least one initial BWP in the first direction.

In a possible implementation manner, the P PRACH transmission opportunities are frequency-multiplexed, and the starting position of one first-direction initial BWP in the frequency domain of at least one first-direction initial BWP and the P PRACH transmission opportunities are at The starting position in the frequency domain is the same.

In a possible implementation manner, the frequency bandwidth occupied by one first-direction initial BWP in the at least one first-direction initial BWP is the same as the frequency bandwidth occupied by C PRACH transmission opportunities among the P PRACH transmission opportunities. Wherein, C is a positive integer less than or equal to P. The P PRACH transmission opportunities are sequentially recorded as PRACH transmission opportunity 0, PRACH transmission opportunity 1, ..., PRACH transmission opportunity P-1 according to the order of frequency from low to high, and the C PRACH transmission opportunities are from the PRACH transmission opportunity C PRACH transmission opportunities starting from 0.

In a possible implementation manner, the starting position of one first-direction initial BWP in the at least one first-direction initial BWP in the frequency domain and the F-th PRACH transmission opportunity among the P PRACH transmission opportunities The starting positions of the frequencies are the same, where F is a positive integer less than or equal to P. The P PRACH transmission opportunities are sequentially recorded as PRACH transmission opportunity 0, PRACH transmission opportunity 1,..., PRACH transmission opportunity P-1 in order of frequency from low to high, and the Fth PRACH transmission opportunity is index number F- 1 PRACH transmission opportunity.

Exemplarily, as shown in Figure 15, assuming that there are 8 PRACH random access opportunities for frequency division multiplexing, the network device can determine 2 initial uplink BWPs according to the 8 random access opportunities, which are initial uplink BWP#0 and Initial uplink BWP#1. The specific determination method is as follows: according to the frequency start position of the 8 PRACH random access opportunities and the initial uplink BWP#0 are the same, the 4 PRACH random access opportunities located in the low frequency among the 8 PRACH random access opportunities are the same as BWP#0 The bandwidths of BWP#0 are the same, that is, C=4 in the above description, so the frequency domain position of BWP#0 can be determined. For the initial uplink BWP#1, the frequency start position of the fourth PRACH random access opportunity among the 8 PRACH random access opportunities is the same as the frequency start position of BWP#0, that is, F=4 in the above description, so The frequency domain location of BWP#1 can be determined.

In a possible implementation manner, a frequency bandwidth occupied by one first-direction initial BWP in the at least one first-direction initial BWP is smaller than or equal to a maximum bandwidth supported by the terminal device.

Wherein, the initial BWP in the first direction may be an initial uplink BWP, or may be an initial downlink BWP.

Wherein, step 1402 may be performed before step 1401, or may be performed at the same time, and this embodiment of the present application does not limit the execution timing of step 1402 and step 1401.

1402. The network device sends configuration information to the terminal device.

In a possible implementation manner, the configuration information is used to indicate the number P of random access channel PRACH transmission opportunities and the starting positions of the P PRACH transmission opportunities in the frequency domain.

1403. The network device determines the frequency position of at least one initial BWP in the second direction according to the frequency position of at least one initial BWP in the first direction.

In a possible implementation, the center frequency position of the initial BWP in the first direction is the same as the center frequency of the initial BWP in the second direction, and the number of PRBs of the initial BWP in the first direction is the same as that of the initial BWP in the second direction . The correspondence between the initial BWP in the first direction and the initial BWP in the second direction may also have other types of correspondence, which is not limited in this embodiment of the present application. Exemplarily, as shown in FIG. 15, in FIG. 15, the center frequency of the initial uplink BWP#0 and the initial downlink BWP#0 are the same, and the number of PRBs of the initial uplink BWP#0 and the initial downlink BWP#0 is the same, so it can be based on The initial uplink BWP#0 determines the frequency position of the initial downlink BWP#0.

In a possible implementation, the initial BWP in the first direction is the initial uplink BWP, and the initial BWP in the second direction is the initial downlink BWP, or, the initial BWP in the first direction is the initial downlink BWP, and the initial BWP in the second direction is the initial Uplink BWP.

1404. The terminal device determines a frequency position of at least one initial partial bandwidth BWP in the first direction according to the configuration information.

In a possible implementation manner, when the terminal device determines the frequency position of at least one initial BWP in the first direction, this step specifically includes: the terminal device determines the frequency position of the PRACH transmission opportunities according to the number P of PRACH transmission opportunities and the frequency of the P PRACH transmission opportunities. The initial position on the domain is used to determine the frequency position of at least one initial BWP in the first direction. The terminal device determines that the frequency position of the initial partial bandwidth BWP in the first direction is the same as that of the network device. Refer to step 1401 for specific implementations and examples.

1405. The terminal device determines the frequency position of at least one initial BWP in the second direction according to the frequency position of at least one initial BWP in the first direction.

In a possible implementation, the center frequency position of the initial BWP in the first direction is the same as the center frequency of the initial BWP in the second direction, and the number of PRBs of the initial BWP in the first direction is the same as that of the initial BWP in the second direction . The correspondence between the initial BWP in the first direction and the initial BWP in the second direction may also have other types of correspondence, which is not limited in this embodiment of the present application. Optionally, the corresponding relationship may be preset or configured for the network device. Since the configuration information sent by the network device does not need to carry information for the terminal device to determine the frequency position of the second initial BWP, it is beneficial to save the signaling overhead of the configuration information.

1406. The network device communicates with the terminal device according to the frequency position of at least one initial BWP in the first direction and the frequency position of at least one initial BWP in the second direction.

1407. The terminal device communicates with the network device according to at least one frequency position of the initial BWP in the first direction and at least one frequency position of the initial BWP in the second direction.

Exemplarily, the terminal device may initiate random access to the network device based on at least one frequency position of the initial BWP in the first direction and at least one frequency position of the initial BWP in the second direction.

Among them, step 1406 only needs to be executed after step 1403, and step 1407 only needs to be executed after step 1405. The embodiment of the present application does not limit the sequence of execution of step 1406 and step 1407. For example, step 1407 can be executed first Then step 1406 is executed.

In order to reduce terminal costs, NR introduces terminal devices with narrow bandwidth capabilities. For load balancing, network devices will allocate multiple initial uplink BWPs to terminal devices for random access. However, the terminal device cannot determine the actual load of the multiple initial uplink BWPs, so how the terminal device selects a suitable initial uplink BWP from the multiple initial uplink BWPs for random access is an urgent problem to be solved. In order to enable terminal equipment to determine a more suitable initial uplink BWP, this application proposes a data transmission method, as shown in Figure 16, Figure 16 is a schematic flow chart of a data transmission method provided by an embodiment of this application, the data transmission The method includes steps 1601 to 1604 as follows.

1601. The network device determines a first initial uplink BWP.

In this embodiment of the present application, the first initial uplink BWP is one of multiple initial uplink BWPs, and the multiple initial uplink BWPs are BWPs allocated by the network device to the terminal device for random access.

Optionally, the first initial uplink BWP is the BWP with the lightest load among the multiple initial uplink BWPs. If the terminal device performs random access based on the first initial uplink BWP, it is beneficial to improve the success rate of random access of the terminal device.

1602. The network device sends indication information to the terminal device.

In this embodiment of the present application, the indication information is used to indicate the index of the first initial uplink BWP among the multiple initial uplink BWPs.

In a possible implementation manner, the indication information is carried in the first DCI. The CRC of the first DCI is scrambled through a Cell-Radio Network Temporary Identifier (C-RNTI).

Optionally, the first DCI is used to trigger the random access process, and the first DCI also includes one or more of the following: random access preamble index, normal uplink/supplementary uplink (Uplink/Supplementary Uplink, UL /SUL) indication, synchronization signal and physical broadcast channel (synchronization signal and physical broadcast channel, SS/PBCH) index, PRACH mask index. Among them, the random access preamble index is used to determine the preamble, UL/SUL indicates the uplink carrier used to send the PRACH, the SS/PBCH index is used to indicate the synchronization signal and the physical broadcast channel, and the PRACH mask index is used to indicate the SS/PBCH The random access opportunity (Random Access Channel occasion, RACH occasion) associated with the synchronization signal indicated by the index and the physical broadcast channel.

In a possible implementation manner, before the network device sends the indication information, the network device sends random access resource configuration information to the terminal device. The random access resource configuration information includes configuration information of A random access resource types, and A does not exceed the number B of SSBs associated with one PRACH opportunity. In order to distinguish different types of terminal devices, network devices set different types of random access resources corresponding to different types of terminal devices. When different types of terminal devices select corresponding random access resources according to their own types to perform random access Input, the network device can determine the type of the terminal device according to the type of the random access resource used by the terminal device, which is beneficial for the network device to allocate appropriate resources for the terminal device more flexibly in the future.

Wherein, one PRACH opportunity corresponds to B SSBs, and B is configured by a network device. Since there are at most 64 preamble indexes that can be used in the random access opportunity corresponding to each SSB, for a random access resource type, in a random access opportunity corresponding to an SSB, the

preamble index, if there are currently A random access resource types, it needs to satisfy

Therefore, A needs to be less than or equal to B, otherwise there may be a situation that the number of preambles of a type corresponding to a certain random access resource is insufficient. Based on this method, it is beneficial to ensure that each type of random access resource has enough preambles to ensure random access performance.

Among them, different types of random access resources correspond to different types of terminal equipment, and the different types of terminal equipment may include one or more of the following types: terminal equipment that supports a maximum bandwidth capability of no more than X MHz, does not support a maximum Terminal equipment with a bandwidth capability not exceeding X MHz, terminal equipment that supports a maximum bandwidth capability of no more than 20MHz, terminal equipment that does not support a maximum bandwidth capability of 20MHz, terminal equipment that supports coverage enhancement, terminal equipment that does not support coverage enhancement, and terminal equipment that supports coverage enhancement A terminal device that repeats three messages (Msg3), a terminal device that does not support Msg3 repetition, a terminal device that supports small packet transmission, a terminal device that does not support small packet transmission, a terminal device that supports two-step RACH, a terminal device that does not support two-step RACH, or A terminal device that supports four-step RACH. Wherein, X is less than 20, for example, X is 5 or 10, and Msg3 is a message sent by the terminal device to the network device after the terminal device receives the random access response sent by the network device in the four-step random access.

1603. The terminal device determines the first initial uplink BWP based on indexes of the first initial uplink BWP in multiple initial uplink BWPs.

1604. The terminal device initiates random access based on the first initial uplink BWP.

In the embodiment of the present application, since the first initial uplink BWP is determined by the network device from multiple initial uplink BWPs, it is used for the terminal device to perform random access, which can increase the success probability of random access. Exemplarily, the load of the first initial uplink BWP is the lightest of the multiple initial uplink BWPs, and when the terminal device communicates with the network device based on the first initial uplink BWP, data loss due to network congestion is unlikely to occur, so It is beneficial to improve the success rate of random access of the terminal equipment.

In a possible implementation manner, the terminal device determines the random access resource corresponding to the type of the terminal device according to the random access resource type configuration information. Exemplarily, the terminal device determines the supported random access resource type according to the capability of the terminal device, and then determines the random access resource corresponding to the random access resource type according to the random access resource type configuration information. A specific implementation manner in which the terminal device initiates random access based on the first initial uplink BWP may be that the terminal device initiates random access based on the first initial uplink BWP and a random access resource corresponding to the type of the terminal device.

Optionally, before the terminal device receives the indication information, the terminal device also receives the random access resource configuration information sent by the network device. The random access resource configuration information includes configuration information of A random access resource types, and A does not exceed one The number B of SSBs associated with the PRACH opportunity. In order to distinguish different types of terminal devices, network devices set different types of random access resources corresponding to different types of terminal devices. When different types of terminal devices select corresponding random access resources according to their own types to perform random access In, the network device determines the type of the terminal device according to the random access resources used by the terminal device, which is beneficial for the network device to more flexibly allocate resources for the terminal device subsequently. Since the random access resources of network devices are limited, if there are more types of random access resources, the number of random access resources corresponding to each type will be less. If the number of random access resource types exceeds a certain value, a certain The number of preambles of the type corresponding to the random access resource is insufficient. One PRACH opportunity corresponds to B SSBs, and B is configured by a network device. Since there are at most 64 preamble indexes that can be used in the random access opportunity corresponding to each SSB, for a random access resource type, in a random access opportunity corresponding to an SSB, the

Therefore, A needs to be less than or equal to B, otherwise there may be a situation that the number of preambles of a type corresponding to a certain random access resource is insufficient. Based on this method, it is beneficial to ensure that each type of random access resource has sufficient preambles, and improve the success rate of random access of terminal equipment.

Referring to FIG. 17 , FIG. 17 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device shown in FIG. 17 may be used to perform some or all functions of the network device in the method embodiment described in FIG. 6 above. The device may be a network device, or a device in the network device, or a device that can be matched with the network device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 17 may include a communication unit 1701 and a processing unit 1702 . Wherein, the processing unit 1702 is configured to perform data processing. The communication unit 1701 is integrated with a receiving unit and a sending unit. The communication unit 1701 may also be called a transceiver unit. Alternatively, the communication unit 1701 may also be split into a receiving unit and a sending unit. The processing unit 1702 and the communication unit 1701 below have the same principle, and will not be described in detail below. in:

The processing unit 1702 is configured to determine a first candidate control channel, the first candidate control channel is composed of N second candidate control channels, the aggregation level of the first candidate control channel is K, and the aggregation level of the second candidate control channel is M , N is greater than 1, and M is less than K; the communication unit 1701 is configured to send downlink control information DCI to the terminal device on the first candidate control channel.

In a possible implementation manner, the DCI carries first information and second information, and the first information and the second information are used by the terminal device to determine the time domain resource of the first physical channel or reference signal scheduled by the DCI; the first The information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts transmission, or the second information is used to determine the time unit at which the DCI ends and the time interval between the time units at which the reference signal starts to transmit.

In a possible implementation, N, M and K satisfy:

or

In a possible implementation manner, the N second candidate control channels belong to the same search space set.

Optionally, the N second candidate control channels are located in the same time slot, or the N second candidate control channels are located in different time slots.

Further optionally, the N second candidate control channels are located in the same time slot; the N second candidate control channels occupy consecutive OFDM symbols in the same time slot, or the N second candidate control channels The control channel occupies discontinuous OFDM symbols in the same time slot.

Further optionally, the N second candidate control channels are located in different time slots; the N second candidate control channels are located in consecutive time slots.

Optionally, the N second candidate control channels belong to multiple search space sets.

Further optionally, the multiple search space sets are associated with the same control resource set CORESET index, or the multiple search space sets are associated with different CORESET indexes.

Further optionally, the multiple search space sets correspond to the same DCI format.

Further optionally, the detection periods of the multiple search space sets are the same, and the time slot offsets are different.

In a possible implementation manner, the transmission configuration indication states corresponding to the N second candidate control channels are the same or different.

In a possible implementation manner, the N second candidate control channels occupy the same frequency domain positions and different time domain positions.

In a possible implementation manner, the bandwidth occupied by the first candidate control channel in the frequency domain is the same as the bandwidth occupied by the second candidate control channel in the frequency domain.

Referring to FIG. 17 , FIG. 17 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus shown in FIG. 17 may be used to perform some or all functions of the terminal device in the method embodiment described in FIG. 6 above. The device may be a terminal device, or a device in the terminal device, or a device that can be matched with the terminal device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 17 may include a communication unit 1701 and a processing unit 1702 . in:

The communication unit 1701 is configured to receive downlink control information DCI from the network device, the DCI is sent by the network device through the first candidate control channel, the first candidate control channel is composed of N second candidate control channels, and the first candidate The aggregation level of the control channel is K, the aggregation level of the second candidate control channel is M, the N is greater than 1, and the M is smaller than the K; the processing unit 1702 is configured to determine the first physical channel scheduled by the DCI according to the DCI Or the time-domain resource of the reference signal.

In a possible implementation manner, the DCI carries first information and second information, the first information is used to determine the time unit when the DCI ends, and the second information is used to determine the time unit when the DCI ends and the time when the first physical channel starts transmission. The time interval between time units, or the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the reference signal starts to be transmitted; the processing unit 1702 is configured to determine the first DCI schedule according to the DCI When the time-domain resource of a physical channel or reference signal is used, the processing unit 1702 is specifically configured to determine the time-domain resource of the first physical channel or reference signal scheduled by DCI according to the first information and the second information.

In a possible implementation manner, the DCI carries first information and second information, and the first information and the second information are used by the terminal device to determine the time domain resources of the first physical channel or reference signal scheduled by the DCI; the first The information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts transmission, or the second information is used to determine the time unit at which the DCI ends and the time interval between the time units at which the reference signal starts to transmit.

In a possible implementation, N, M and K satisfy:

or

Further optionally, the N second candidate control channels are located in the same time slot; the N second candidate control channels occupy consecutive orthogonal frequency division multiplexing OFDM symbols in the same time slot, or the N second candidate control channels The two candidate control channels occupy discontinuous OFDM symbols in the same time slot.

Referring to FIG. 17 , FIG. 17 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device shown in FIG. 17 may be used to perform some or all functions of the network device in the method embodiment described in FIG. 13 above. The device may be a network device, or a device in the network device, or a device that can be matched with the terminal device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 17 may include a communication unit 1701 and a processing unit 1702 . in:

The processing unit 1702 is configured to determine downlink control information DCI, where the DCI carries first information and second information, and the first information and second information are used by the terminal device to determine the time domain resource of the first physical channel or reference signal scheduled by the DCI ; The first information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts to transmit, or the second information uses Determine the time interval between the time unit at which the DCI ends and the time unit at which the reference signal starts to be transmitted; the communication unit 1701 is configured to send the DCI to the terminal device.

For other possible implementation manners of the communication apparatus, reference may be made to the relevant description of the network device functions in the method embodiment corresponding to FIG. 13 above, which will not be repeated here.

Referring to FIG. 17 , FIG. 17 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus shown in FIG. 17 may be used to perform some or all functions of the terminal device in the method embodiment described in FIG. 13 above. The device may be a terminal device, or a device in the terminal device, or a device that can be matched with the terminal device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 17 may include a communication unit 1701 and a processing unit 1702 . in:

The communication unit 1701 is configured to receive downlink control information DCI from the network device, the DCI carries first information and second information, the first information is used to determine the time unit when the DCI ends, and the second information is used to determine the time unit when the DCI ends The time interval between the time unit and the time unit when the first physical channel starts to transmit, or the second information is used to determine the time interval between the time unit when the DCI ends and the time unit when the reference signal starts to transmit; the processing unit 1702, It is used to determine the time-domain resource of the first physical channel or reference signal scheduled by DCI according to the first information and the second information.

For other possible implementation manners of the communication apparatus, refer to the related description of the functions of the terminal device in the above method embodiment corresponding to FIG. 13 , which will not be repeated here.

Referring to FIG. 17 , FIG. 17 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus shown in FIG. 17 may be used to perform some or all functions of the network device in the method embodiment described in FIG. 14 above. The device may be a network device, or a device in the network device, or a device that can be matched with the network device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 17 may include a communication unit 1701 and a processing unit 1702 . in:

The processing unit 1702 is configured to determine the frequency position of at least one initial partial bandwidth BWP in the first direction; the communication unit 1701 is configured to send configuration information to the terminal device, and the configuration information is used to configure at least one initial BWP in the first direction Frequency position; the processing unit 1702 is further configured to determine the frequency position of at least one initial BWP in the second direction according to the frequency position of at least one initial BWP in the first direction; the communication unit 1701 is also configured to determine the frequency position of at least one initial BWP in the first direction The frequency position and the frequency position of at least one initial BWP in the second direction are communicated with the terminal device.

For other possible implementation manners of the communication apparatus, refer to the relevant description of the network device functions in the above method embodiment corresponding to FIG. 14 , which will not be repeated here.

Referring to FIG. 17 , FIG. 17 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus shown in FIG. 17 may be used to perform some or all functions of the terminal device in the method embodiment described in FIG. 14 above. The device may be a terminal device, or a device in the terminal device, or a device that can be matched with the terminal device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 17 may include a communication unit 1701 and a processing unit 1702 . in:

The communication unit 1701 is configured to receive configuration information sent by the network device, the configuration information is used to configure the frequency position of at least one initial BWP in the first direction; the processing unit 1702 is configured to determine at least one initial BWP in the first direction according to the configuration information The frequency position of the partial bandwidth BWP; the processing unit 1702 is further configured to determine the frequency position of at least one initial BWP in the second direction according to the frequency position of at least one initial BWP in the first direction; The frequency location of the initial BWP in one direction and the frequency location of at least one initial BWP in the second direction are communicated with the network device.

For other possible implementation manners of the communication apparatus, refer to the relevant description of the functions of the terminal device in the method embodiment corresponding to FIG. 14 above, and details are not described here.

Referring to FIG. 17 , FIG. 17 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device shown in FIG. 17 may be used to perform some or all functions of the network device in the method embodiment described in FIG. 16 above. The device may be a network device, or a device in the network device, or a device that can be matched with the network device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 17 may include a communication unit 1701 and a processing unit 1702 . in:

The processing unit 1702 is configured to determine a first initial uplink BWP, and the first initial uplink BWP is one of multiple initial BWPs; the communication unit 1701 is configured to send indication information to a terminal device, where the indication information is used to indicate the Indexes of the first initial uplink BWP in the multiple initial uplink BWPs.

For other possible implementation manners of the communication apparatus, reference may be made to the relevant description of the network device functions in the method embodiment corresponding to FIG. 16 above, which will not be repeated here.

Referring to FIG. 17 , FIG. 17 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus shown in FIG. 17 may be used to perform some or all functions of the terminal device in the method embodiment described in FIG. 16 above. The device may be a terminal device, or a device in the terminal device, or a device that can be matched with the terminal device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 17 may include a communication unit 1701 and a processing unit 1702 . in:

The communication unit 1701 is configured to receive indication information sent by the network device, the indication information is used to indicate the index of the first initial uplink BWP in multiple initial uplink BWPs; the processing unit 1702 is configured to The index in the multiple initial uplink BWPs determines the first initial uplink BWP; the processing unit 1702 is configured to initiate random access to the network device based on the first initial uplink BWP.

For other possible implementation manners of the communication apparatus, refer to the relevant description of the functions of the terminal device in the above method embodiment corresponding to FIG. 16 , which will not be repeated here.

FIG. 18 shows a schematic structural diagram of a communication device. The communication device 1800 may be the terminal device in the above method embodiment, or the network device in the above method embodiment, or it may be a chip, a chip system, or a processor that supports the terminal device to implement the above method, or it may be It is a chip, a chip system, or a processor that supports the network device to implement the above method. The communication device may be used to implement the methods described in the foregoing method embodiments, and for details, reference may be made to the descriptions in the foregoing method embodiments.

The communication device 1800 may include one or more processors 1801 . The processor 1801 may be a general-purpose processor or a special-purpose processor. For example, it can be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control communication devices (such as base stations, baseband chips, terminals, terminal chips, DU or CU, etc.), execute software programs, and process Data for Software Programs.

Optionally, the communication device 1800 may include one or more memories 1802, on which instructions 1804 may be stored, and the instructions may be executed on the processor 1801, so that the communication device 1800 executes the above method Methods described in the Examples. Optionally, data may also be stored in the memory 1802 . The processor 1801 and the memory 1802 may be set separately or integrated together.

Optionally, the communication device 1800 may further include a transceiver 1805 and an antenna 1806 . The transceiver 1805 may be called a transceiver unit, a transceiver, or a transceiver circuit, etc., and is used to implement a transceiver function. The transceiver 1805 may include a receiver and a transmitter, and the receiver may be called a receiver or a receiving circuit for realizing a receiving function; the transmitter may be called a transmitter or a sending circuit for realizing a sending function.

The communication apparatus 1800 is a terminal device: the processor 1801 is configured to execute data processing operations of the terminal device in the foregoing method embodiments. The transceiver 1805 is configured to perform data transceiving operations of the terminal device in the foregoing method embodiments.

The communication apparatus 1800 is a network device: the processor 1801 is configured to perform data processing operations of the network device in the foregoing method embodiments. The transceiver 1805 is configured to perform the data transceiving operation of the network device in the foregoing method embodiments.

In another possible design, the processor 1801 may include a transceiver for implementing receiving and sending functions. For example, the transceiver may be a transceiver circuit, or an interface, or an interface circuit. The transceiver circuits, interfaces or interface circuits for realizing the functions of receiving and sending can be separated or integrated together. The above-mentioned transceiver circuit, interface or interface circuit may be used for reading and writing code/data, or the above-mentioned transceiver circuit, interface or interface circuit may be used for signal transmission or transmission.

In yet another possible design, optionally, the processor 1801 may store instructions 1803, and the instructions 1803 run on the processor 1801, and may cause the communication device 1800 to execute the methods described in the foregoing method embodiments. The instruction 1803 may be fixed in the processor 1801, in this case, the processor 1801 may be implemented by hardware.

In yet another possible design, the communication device 1800 may include a circuit, and the circuit may implement the function of sending or receiving or communicating in the foregoing method embodiments. The processor and the transceiver described in the embodiment of the present application can be implemented in integrated circuit (integrated circuit, IC), analog IC, radio frequency integrated circuit RFIC, mixed signal IC, application specific integrated circuit (application specific integrated circuit, ASIC), printed circuit board (printed circuit board, PCB), electronic equipment, etc. The processor and transceiver can also be fabricated using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), nMetal-oxide-semiconductor (NMOS), P-type Metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (Bipolar Junction Transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

The communication device described in the above embodiments may be a terminal device or a network device, but the scope of the communication device described in the embodiment of this application is not limited thereto, and the structure of the communication device may not be limited by FIG. 18 . A communication device may be a stand-alone device or may be part of a larger device. For example the communication device may be:

(1) Stand-alone integrated circuits ICs, or chips, or chip systems or subsystems;

(2) A set of one or more ICs, optionally, the set of ICs may also include storage components for storing data and instructions;

(3) ASIC, such as modem (MSM);

(4) Modules that can be embedded in other devices;

(5) Receivers, terminals, smart terminals, cellular phones, wireless devices, handsets, mobile units, vehicle-mounted devices, network devices, cloud devices, artificial intelligence devices, etc.;

(6) Others and so on.

For the case where the communication device may be a chip or a chip system, refer to the schematic structural diagram of the chip shown in FIG. 19 . The chip shown in FIG. 19 includes a processor 1901 and an interface 1902 . Optionally, a memory 1903 may also be included. Wherein, the number of processors 1901 may be one or more, and the number of interfaces 1902 may be more than one.

In one design, for the case where the chip is used to implement the functions of the terminal device in the embodiment of the present application:

The interface 1902 is used to receive or output signals;

The processor 1901 is configured to execute data processing operations of the terminal device in the foregoing method embodiments.

In another design, for the case where the chip is used to implement the functions of the network device in the embodiment of this application:

The interface 1902 is used to receive or output signals;

The processor 1901 is configured to execute data processing operations of the network device in the foregoing method embodiments.

It can be understood that, in some scenarios, some optional features in the embodiments of the present application may be implemented independently without depending on other features, such as the current solution on which they are based, to solve corresponding technical problems and achieve corresponding The effect can also be combined with other features according to requirements in some scenarios. Correspondingly, the communication device provided in the embodiment of the present application can also implement these features or functions correspondingly, which will not be repeated here.

It should be understood that the processor in this embodiment of the present application may be an integrated circuit chip that has a signal processing capability. In the implementation process, each step of the above-mentioned method embodiments may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software. The above-mentioned processor can be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other possible Program logic devices, discrete gate or transistor logic devices, discrete hardware components.

It can be understood that the memory in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories. Among them, the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, many forms of RAM are available such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM ) and direct memory bus random access memory (direct rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

The present application also provides a computer-readable medium for storing computer software instructions, and when the instructions are executed by a communication device, the functions of any one of the above method embodiments are realized.

The present application also provides a computer program product, which is used for storing computer software instructions, and when the instructions are executed by a communication device, the functions of any one of the above method embodiments are realized.

In the above embodiments, all or part may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (solid state disk, SSD)) etc.

The embodiment of the present application further provides a computer program product. When the computer program product is run on a processor, the method flow of the above method embodiment is realized.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Because of this application, certain operations may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by this application.

The descriptions of the various embodiments provided in this application can refer to each other, and the descriptions of each embodiment have their own emphases. For the parts that are not described in detail in a certain embodiment, you can refer to the relevant descriptions of other embodiments. For the convenience and brevity of description, for example, regarding the functions and operations of the various devices and devices provided in the embodiments of the present application, reference may be made to the relevant descriptions of the method embodiments of the present application. May be cross-referenced, combined or cited.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims

A method for data transmission, characterized in that the method comprises:

The network device determines a first candidate control channel, the first candidate control channel is composed of N second candidate control channels, the aggregation level of the first candidate control channel is K, and the aggregation level of the second candidate control channel is M, the N is greater than 1, and the M is smaller than the K;

The network device sends downlink control information DCI to the terminal device on the first candidate control channel.
The method according to claim 1, wherein the DCI carries first information and second information, and the first information and the second information are used by the terminal device to determine the first information scheduled by the DCI. Time-domain resources of physical channels or reference signals;

The first information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts transmission, or , the second information is used to determine the time interval between the time unit when the DCI ends and the time unit when the reference signal starts to be transmitted.
A method for data transmission, characterized in that the method comprises:

The terminal device receives downlink control information DCI from the network device, the DCI is sent by the network device through a first candidate control channel, the first candidate control channel is composed of N second candidate control channels, and the first The aggregation level of the candidate control channel is K, the aggregation level of the second candidate control channel is M, the N is greater than 1, and the M is smaller than the K;

The terminal device determines, according to the DCI, time-domain resources of the first physical channel or reference signal scheduled by the DCI.
The method according to claim 3, wherein the DCI carries first information and second information, the first information is used to determine the time unit at which the DCI ends, and the second information is used to determine the The time interval between the time unit when the DCI ends and the time unit when the first physical channel starts to transmit, or the second information is used to determine the time unit when the DCI ends and the time when the reference signal starts to transmit time interval between units;

The terminal device determines the time-domain resources of the first physical channel or reference signal scheduled by the DCI according to the DCI, including:

The terminal device determines, according to the first information and the second information, time-domain resources of the first physical channel or reference signal scheduled by the DCI.
The method according to any one of claims 1-4, characterized in that the K is greater than a first threshold.
The method according to any one of claims 1-5, wherein said N, said M and said K satisfy:
or
The method according to any one of claims 1-6, wherein the N second candidate control channels belong to the same set of search spaces.
The method according to claim 7, wherein the N second candidate control channels are located in the same time slot, or the N second candidate control channels are located in different time slots.
The method according to claim 8, wherein the N second candidate control channels are located in the same time slot;

The N second candidate control channels occupy consecutive OFDM symbols in the same time slot, or the N second candidate control channels occupy discontinuous OFDM symbols in the same time slot.
The method according to claim 8, wherein the N second candidate control channels are located in different time slots;

The N second candidate control channels are located in consecutive time slots.
The method according to any one of claims 1-6, wherein the N second candidate control channels belong to multiple sets of search spaces.
The method according to claim 11, wherein the multiple search space sets are associated with the same control resource set CORESET index, or the multiple search space sets are associated with different CORESET indexes.
The method according to claim 11 or 12, wherein the multiple search space sets correspond to the same DCI format.
The method according to any one of claims 11-13, characterized in that, the detection cycles of the multiple search space sets are the same, and the time slot offsets are different.
The method according to any one of claims 1-14, wherein the transmission configuration indication states corresponding to the N second candidate control channels are the same or different.
The method according to any one of claims 1-15, wherein the N second candidate control channels occupy the same frequency domain positions and different time domain positions.
The method according to any one of claims 1-16, wherein the bandwidth occupied by the first candidate control channel in the frequency domain is the same as the bandwidth occupied by the second candidate control channel in the frequency domain.
A communication device, characterized in that the communication device includes a communication unit and a processing unit, wherein:

The processing unit is configured to determine a first candidate control channel, the first candidate control channel is composed of N second candidate control channels, the aggregation level of the first candidate control channel is K, and the second candidate control channel The aggregation level of the channel is M, the N is greater than 1, and the M is less than the K;

The communication unit is configured to send downlink control information DCI to the terminal device on the first candidate control channel.
The communication device according to claim 18, wherein the DCI carries first information and second information, and the first information and the second information are used by the terminal device to determine the first information scheduled by the DCI. a time-domain resource of a physical channel or a reference signal;

The first information is used to determine the time unit at which the DCI ends, and the second information is used to determine the time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts transmission, or , the second information is used to determine the time interval between the time unit when the DCI ends and the time unit when the reference signal starts to be transmitted.
A communication device, characterized in that the communication device includes a communication unit and a processing unit, wherein:

The communication unit is configured to receive downlink control information DCI from the network device, the DCI is sent by the network device through a first candidate control channel, and the first candidate control channel is composed of N second candidate control channels , the aggregation level of the first candidate control channel is K, the aggregation level of the second candidate control channel is M, the N is greater than 1, and the M is less than the K;

The processing unit is configured to determine, according to the DCI, time-domain resources of the first physical channel or reference signal scheduled by the DCI.
The communication device according to claim 20, wherein the DCI carries first information and second information, the first information is used to determine the time unit at which the DCI ends, and the second information is used to determine The time interval between the time unit at which the DCI ends and the time unit at which the first physical channel starts to transmit, or the second information is used to determine the time unit at which the DCI ends and the time unit at which the reference signal starts to transmit time interval between time units;

The processing unit is configured to determine the time-domain resources of the first physical channel or reference signal scheduled by the DCI according to the DCI, including:

The processing unit is configured to determine, according to the first information and the second information, time-domain resources of the first physical channel or reference signal scheduled by the DCI.
The communication device according to any one of claims 18-21, wherein the K is greater than a first threshold.
The communication device according to any one of claims 18-22, wherein the N, the M, and the K satisfy:
or
The communication device according to any one of claims 18-23, wherein the N second candidate control channels belong to the same set of search spaces.
The communication device according to claim 24, wherein the N second candidate control channels are located in the same time slot, or the N second candidate control channels are located in different time slots.
The communication device according to claim 25, wherein the N second candidate control channels are located in the same time slot;

The N second candidate control channels occupy consecutive OFDM symbols in the same time slot, or the N second candidate control channels occupy discontinuous OFDM symbols in the same time slot.
The communication device according to claim 25, wherein the N second candidate control channels are located in different time slots;

The N second candidate control channels are located in consecutive time slots.
The communication device according to any one of claims 18-23, wherein the N second candidate control channels belong to multiple sets of search spaces.
The communication device according to claim 28, wherein the multiple search space sets are associated with the same control resource set CORESET index, or the multiple search space sets are associated with different CORESET indexes.
The communication device according to claim 28 or 29, wherein the multiple search space sets correspond to the same DCI format.
The communication device according to any one of claims 28 to 30, wherein the detection periods of the plurality of search space sets are the same, and the time slot offsets are different.
The communication device according to any one of claims 28-31, wherein the transmission configuration indication states corresponding to the N second candidate control channels are the same or different.
The communication device according to any one of claims 18-32, wherein the N second candidate control channels occupy the same frequency domain positions and different time domain positions.
The communication device according to any one of claims 18-33, wherein the bandwidth occupied by the first candidate control channel in the frequency domain is the same as the bandwidth occupied by the second candidate control channel in the frequency domain .
A communication device, the communication device comprising a processor, when the processor executes the computer program in the memory, the method according to any one of claims 1-17 is performed.
A communication device, characterized in that it includes a processor and a memory;

The memory is used to store computer-executable instructions;

The processor is configured to execute computer-executable instructions stored in the memory, so that the communication device executes the method according to any one of claims 1-17.
A communication device, characterized in that it includes a processor, a memory, and a transceiver;

The transceiver is used to receive signals or send signals;

The memory is used to store computer programs;

The processor is configured to call the computer program from the memory to execute the method according to any one of claims 1-17.
A chip, characterized in that it includes a processor and an interface;

The communication interface is used to receive or output signals;

The processor is used to run a program, so that the communication device implements the method according to any one of claims 1-17.
A computer-readable storage medium, characterized in that computer-readable instructions are stored in the computer-readable medium, and when the computer-readable instructions are run on the communication device, the communication device is made to execute the following claims 1- The method of any one of 17.
A computer program product, characterized in that when the computer reads and executes the computer program product, the computer is made to execute the method according to any one of claims 1-17.