Control information transmission method

Abstract

An embodiment of the present application provides a control information transmission method that can align the sizes of different downlink control information (DCI), thereby reducing the variety of DCI sizes and reducing power consumption when a terminal detects DCI. The method includes: in a first search space, a terminal device detects first downlink control information (DCI); wherein the first DCI is used to indicate an active bandwidth part (BWP) of the terminal device, the size of the first DCI is aligned with the size of a second DCI, the second DCI is a DCI that can be sent by a network device to the terminal device in the first common search space, and the second DCI is used to schedule a system message, a paging message, or a random access response (RAR).

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technologies, and in particular to a method, device, and system for transmitting control information. Background Art

[0002] With the development of communication technology and the increase in user demand, terminal devices in communication scenarios are becoming increasingly numerous and diverse. For example, in industrial automation scenarios, factories are filled with numerous monitoring devices, machines, and sensors; in home and daily life scenarios, there are numerous mobile phones, tablets, wearable devices, smart appliances, and in-vehicle terminal devices. Summary of the Invention

[0003] An embodiment of the present application provides a control information transmission method, which aims to reduce the power consumption of a terminal device when detecting control information.

[0004] In a first aspect, a method for transmitting control information is provided, comprising: detecting first downlink control information (DCI) in a first search space; wherein the first DCI is used to indicate an activated bandwidth part (BWP) of a terminal device, the activated BWP is used to transmit a physical data channel between the terminal device and the network device, the size of the first DCI is aligned with the size of the second DCI, the second DCI is a DCI that can be transmitted in a first public search space, and the second DCI is used to schedule a public message. Optionally, the public message may be a system message, a paging message, or a random access response (RAR). Optionally, the first search space is a first specific search space.

[0005] The method can also be described as: detecting second downlink control information DCI from a network device in a first public search space of a terminal device; wherein the second DCI is used to schedule a public message, the size of the second DCI is aligned with the size of the first DCI, the first DCI is a DCI that can be transmitted in the first search space, and the first DCI is used to indicate the activated bandwidth part BWP of the terminal device, and the activated BWP is used for the terminal device and the network device to transmit a physical data channel. Optionally, the public message can be a system message, a paging message, or a random access response RAR. Optionally, the first search space is a first specific search space.

[0006] Through this method, the size of the DCI (first DCI) transmitted in the first search space of the terminal device is the same as the size of the DCI (second DCI) transmitted in the first common search space of the terminal device, which can reduce the types of DCI sizes detected by the terminal device, thereby reducing the number of times the terminal device detects the PDCCH. In addition, by indicating the activated BWP of the terminal device in the first DCI, the BWP switching function can be implemented, so that the terminal device can fully utilize the frequency domain diversity gain when transmitting information. Exemplarily, when this method is used for a terminal device with a narrow bandwidth (such as a REDCAP terminal), frequency domain resources can be allocated to the terminal device in a larger bandwidth range through BWP switching, so that the frequency domain diversity gain can be utilized to provide data transmission reliability.

[0007] In one possible design, the first specific search space is included in multiple specific search spaces of the terminal device, one specific search space among the multiple specific search spaces corresponds to N1 DCI formats, and the multiple specific search spaces correspond to N2 DCI formats in total. The DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, where N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1.

[0008] Through this method, the DCI sizes transmitted in multiple specific search spaces of the terminal device are the same, which can reduce the types of DCI sizes detected by the terminal device, thereby reducing the number of times the terminal device detects PDCCH.

[0009] In one possible design, the size of the first DCI and the size of the second DCI are aligned, including:

[0010] The number of bits of the bit stream of the first DCI is equal to the number of bits of the bit stream of the second DCI;

[0011] The bit stream of the first DCI is the information bit stream of the first DCI, or the bit stream of the first DCI is a bit stream obtained by padding or truncating the information bit stream of the first DCI, and the bit stream of the second DCI is the information bit stream of the second DCI; or

[0012] The first DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the first DCI, and the second DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the second DCI, wherein the first operation includes one or more of the following operations: adding cyclic redundancy check (CRC) bits, channel coding, and scrambling;

[0013] or,

[0014] The number of modulation symbols corresponding to the first DCI is equal to the number of modulation symbols corresponding to the second DCI.

[0015] Through this method, alignment of the first DCI size and the second DCI size can be achieved.

[0016] In one possible design, the first DCI is truncated or includes padding bits. Optionally, one or more of the following information fields in the first DCI are truncated: the frequency domain resource allocation field, and the transmission parameters of the second transport block. Optionally, when the frequency domain resource allocation field is truncated, one or more high-order bits of the frequency domain resource allocation field are truncated. Optionally, when the transmission parameters of the second transport block are truncated, the first DCI includes the transmission parameters of the first transport block, and the transmission parameters of the second transport block are the same as the transmission parameters of the first transport block. Through this method, alignment of the first DCI size and the second DCI size can be achieved.

[0017] In one possible design, the first DCI includes a frequency domain resource allocation domain, which is used to indicate the frequency domain resources allocated to the physical data channel in the activated BWP; wherein, the size of the frequency domain resource allocation domain is determined according to the bandwidth of the initial BWP, and the initial BWP is used by the terminal device to receive the synchronization signal block SSB from the network device; or, the size of the frequency domain resource allocation domain is determined according to the bandwidth of the control resource set CORESET 0, and the CORESET 0 is used by the terminal device to receive the DCI scrambled by the system information radio network temporary identifier SI-RNTI from the network device.

[0018] Through this method, the size of the frequency domain resource allocation domain of the first DCI can be aligned with the size of the frequency domain resource allocation domain of the second DCI, thereby better achieving the alignment of the size of the first DCI and the size of the second DCI.

[0019] In one possible design, the first DCI can also be transmitted in the second public search space. The method can also be described as, the first search space is the second public search space. Through this method, when there are extra resources in the second public search space that are not used, the network device can use the resources to transmit the first DCI to the terminal device, thereby improving resource utilization. When the first DCI is transmitted in the second public search space, the RNTI of the first DCI is scrambled by the UE-specific RNTI. In addition, the second public search space can also transmit public DCI scrambled by the public RNTI. When the terminal device receives DCI in the second public search space, it can obtain the RNTI used to scramble the DCI by descrambling the DCI, so as to obtain whether the DCI is UE-specific DCI or public DCI. The second public search space and the first public search space may be the same or different.

[0020] In one possible design, the physical data channel includes a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH), and the first DCI is further used to indicate whether the first DCI is used to schedule the PDSCH or the PUSCH. This method enables scheduling of multiple channels using a single DCI size, thereby achieving more scheduling capabilities and enabling the base station and UE to transmit multiple channels with low power consumption.

[0021] In one possible design, the first DCI includes an identification field of a DCI format. When the identification field is a first value, the first DCI is used to schedule a PUSCH. When the identification field is a second value, the first DCI is used to schedule a PDSCH. This method can easily implement scheduling of multiple different channels using a DCI of one size.

[0022] In one possible design, when the first DCI is scrambled by the first RNTI, the first DCI is used to schedule the PUSCH, and when the first DCI is scrambled by the second RNTI, the first DCI is used to schedule the PDSCH. This method can implicitly implement scheduling multiple different channels with a DCI of one size, thereby saving the overhead of the first DCI.

[0023] In one possible design, the CRC bits of the first DCI are scrambled using the radio network temporary identifier RNTI specific to the terminal device. Optionally, the terminal device specific RNTI is any one of the following RNTIs: C-RNTI, SPS-RNTI, MCS-C-RNTI, SP-CSI-RNTI, and CS-RNTI. Through this method, it is possible to implicitly indicate that the type of the first DCI is specific to the terminal device, so that the terminal device can determine whether the DCI is specific to the terminal by descrambling the DCI.

[0024] In one possible design, the CRC bits of the second DCI are scrambled using a public RNTI. Optionally, the public RNTI is any one of the following RNTIs: SI-RNTI, P-RNTI, and RA-RNTI. Through this method, the type of the second DCI can be implicitly indicated as public, so that the terminal device can determine the type of the DCI by descrambling the DCI. Optionally, the terminal device can determine the type of information carried on the PDSCH scheduled by the second DCI based on the RNTI of the scrambled second DCI, so that it can be received on demand. For example, the PDSCH scheduled by the second DCI scrambled by SI-RNTI carries a system message, the PDSCH scheduled by the second DCI scrambled by P-RNTI carries a paging message, and the PDSCH scheduled by the second DCI scrambled by RA-RNTI carries an RAR.

[0025] In one possible design, the method further includes: sending indication information to the network device to indicate the type or capability information of the terminal device. For example, indicating that the type of the terminal device is a REDCAP terminal. Optionally, the type of the terminal device is a REDCAP terminal or a high-capability terminal. Optionally, the capability information of the terminal device includes one or more of the following information: maximum bandwidth supported, number of antennas supported, maximum transmit power supported, whether carrier aggregation is supported, number of carriers supported, corresponding protocol version, duplex capability, data processing capability, and peak rate. Through this method, when the above-mentioned DCI alignment method is adopted for the REDCAP terminal, and the above-mentioned DCI alignment method does not need to be adopted for the high-capability terminal, it can be convenient for the network device to know the type of the terminal device, thereby executing the corresponding DCI transmission method.

[0026] In a second aspect, a method for transmitting control information is provided, comprising: detecting first downlink control information DCI in a first specific search space of a terminal device, wherein the first DCI is used to indicate an activated bandwidth part BWP of the terminal device, and the activated BWP is used to transmit a physical data channel between the terminal device and a network device; wherein the first specific search space is included in a plurality of specific search spaces of the terminal device, one specific search space among the plurality of specific search spaces corresponds to N1 DCI formats, and the plurality of specific search spaces correspond to a total of N2 DCI formats, and the DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1.

[0027] Through this method, the DCI sizes transmitted in multiple specific search spaces of the terminal device are the same, that is, the terminal device is configured to detect a DCI size in the multiple specific search spaces, that is, a DCI size is configured for multiple specific search spaces of the terminal device, which can reduce the types of DCI sizes detected by the terminal device, thereby reducing the number of times the terminal device detects the PDCCH. In addition, the activation BWP of the terminal device is indicated in the first DCI, and the BWP switching function can be implemented, so that the terminal device can fully utilize the frequency domain diversity gain when transmitting information. Exemplarily, when this method is used for a terminal device with a narrow bandwidth (such as a REDCAP terminal), frequency domain resources can be allocated to the terminal device in a larger bandwidth range through BWP switching, so that the frequency domain diversity gain can be utilized to provide data transmission reliability.

[0028] Optionally, the sizes of the DCIs of the N2 DCI formats are aligned when transmitted in the corresponding specific search space, including: the DCIs of the N2 DCI formats are aligned to the size of the second DCI described in the first aspect when transmitted in the corresponding specific search space, or aligned to another size. The other size can be a predefined value, or it can be the DCI size corresponding to one of the N2 DCI formats. For example, the DCI size is the smallest DCI size among the DCI sizes corresponding to the N2 DCI formats, or it is the largest DCI size among the DCI sizes corresponding to the N2 DCI formats. Through this method, it is possible to configure a DCI size for multiple specific search spaces of a terminal device.

[0029] In one possible design, the physical data channel includes a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH), and the first DCI is further used to indicate whether the first DCI is used to schedule the PDSCH or the PUSCH. This method enables scheduling of multiple channels using a single DCI size, thereby achieving more scheduling capabilities and enabling the base station and UE to transmit multiple channels with low power consumption.

[0030] Optionally, the method of whether the first DCI indication is used to schedule PDSCH or PUSCH can be referred to the first aspect and will not be repeated here.

[0031] In one possible design, the CRC bits of the first DCI are scrambled using the radio network temporary identifier RNTI specific to the terminal device. For an introduction to the terminal device specific RNTI, please refer to the first aspect and will not be repeated here.

[0032] In one possible design, the first DCI can also be transmitted in a common search space. For an introduction to this method, reference may be made to the first aspect and no further details will be given here.

[0033] In a third aspect, a method for transmitting control information is provided, comprising: sending first downlink control information (DCI) to a terminal device in a first search space;

[0034] The first DCI is used to indicate the activated bandwidth part BWP of the terminal device, and the activated BWP is used for the terminal device and the network device to transmit the physical data channel. The size of the first DCI and the size of the second DCI are aligned. The second DCI is a DCI that can be transmitted in the first public search space. The second DCI is used to schedule system messages, paging messages, or random access responses RAR.

[0035] The method can also be described as: sending second downlink control information (DCI) to the terminal device in a first common search space of the terminal device; wherein the second DCI is used to schedule common messages, the size of the second DCI is aligned with the size of the first DCI, the first DCI is a DCI that can be transmitted in the first search space, and the first DCI is used to indicate the activated bandwidth part (BWP) of the terminal device, and the activated BWP is used for transmitting a physical data channel between the terminal device and a network device. Optionally, the common message can be a system message, a paging message, or a random access response (RAR).

[0036] For the introduction of the first search space, the first DCI, the second DCI, etc., please refer to the first aspect and will not be repeated here.

[0037] In a fourth aspect, a method for transmitting control information is provided, comprising: sending first downlink control information DCI to a terminal device in a first specific search space of the terminal device, wherein the first DCI is used to indicate an activated bandwidth part BWP of the terminal device, and the activated BWP is used for transmitting a physical data channel between the terminal device and the network device; wherein the first specific search space is included in multiple specific search spaces of the terminal device, one specific search space among the multiple specific search spaces corresponds to N1 DCI formats, and the multiple specific search spaces correspond to N2 DCI formats in total, and the DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1.

[0038] For an introduction to the first DCI and alignment method, etc., please refer to the second aspect and will not be repeated here.

[0039] In a fifth aspect, a device is provided, which may be a terminal device or other device capable of implementing the method described in the first or second aspect. The other device can be installed in the terminal device or can be used in combination with the terminal device. In one design, the device may include a module corresponding to the execution of the method / operation / step / action described in the first or second aspect. The module may be a hardware circuit, software, or a combination of hardware circuit and software. In one design, the device may include a processing module and a communication module.

[0040] In one possible design, a communication module is configured to detect first downlink control information (DCI) in a first search space; wherein the first DCI is used to indicate an activated bandwidth part (BWP) of a terminal device, the activated BWP is used to transmit a physical data channel between the terminal device and the network device, the size of the first DCI is aligned with the size of the second DCI, the second DCI is a DCI that can be transmitted in the first common search space, and the second DCI is used to schedule a system message, a paging message, or a random access response (RAR). The communication module is configured to process (demodulate and decode, etc.) the received first DCI.

[0041] For the introduction of the first search space, the first DCI, the second DCI, etc., please refer to the first aspect and will not be repeated here.

[0042] In one possible design, a communication module is used to detect first downlink control information DCI in a first specific search space of a terminal device, wherein the first DCI is used to indicate an activated bandwidth part BWP of the terminal device, and the activated BWP is used for transmitting a physical data channel between the terminal device and the network device; wherein the first specific search space is included in a plurality of specific search spaces of the terminal device, one specific search space of the plurality of specific search spaces corresponds to N1 DCI formats, and the plurality of specific search spaces correspond to a total of N2 DCI formats, and the DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1. The communication module is used to process (demodulate and decode, etc.) the received first DCI.

[0043] For an introduction to the first DCI and alignment method, etc., please refer to the second aspect and will not be repeated here.

[0044] In a sixth aspect, a device is provided, which may be a network device or other device capable of implementing the method described in the third or fourth aspect. The other device can be installed in the network device or can be used in combination with the network device. In one design, the device may include a module corresponding to the execution of the method / operation / step / action described in the third or fourth aspect, and the module may be a hardware circuit, software, or a combination of hardware circuit and software. In one design, the device may include a processing module and a communication module.

[0045] In one possible design, a communication module is configured to send first downlink control information (DCI) to a terminal device in a first search space; wherein the first DCI is configured to indicate an activated bandwidth part (BWP) of the terminal device, the activated BWP is configured to be used for transmitting a physical data channel between the terminal device and a network device, the size of the first DCI is aligned with the size of the second DCI, the second DCI is a DCI that can be transmitted in the first common search space, and the second DCI is configured to schedule a system message, a paging message, or a random access response (RAR). The processing module is configured to generate the first DCI.

[0046] For an introduction to the first DCI and the second DCI, etc., please refer to the first aspect and will not be repeated here.

[0047] In one possible design, a communication module is used to send first downlink control information DCI to a terminal device in a first specific search space of the terminal device, wherein the first DCI is used to indicate an activated bandwidth part BWP of the terminal device, and the activated BWP is used for transmitting a physical data channel between the terminal device and a network device; wherein the first specific search space is included in a plurality of specific search spaces of the terminal device, one specific search space of the plurality of specific search spaces corresponds to N1 DCI formats, and the plurality of specific search spaces correspond to a total of N2 DCI formats, and the DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1. The processing module is used to generate a first DCI.

[0048] For an introduction to the first DCI and alignment method, etc., please refer to the second aspect and will not be repeated here.

[0049] In a seventh aspect, an embodiment of the present application provides a device, comprising a processor for implementing the method described in the first or second aspect above. The device may further comprise a memory for storing instructions. The memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the method described in the first or second aspect above may be implemented. The device may further comprise a communication interface, wherein the communication interface is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, pin, or other type of communication interface, and the other device may be a network device.

[0050] In one possible design, the apparatus includes:

[0051] a memory for storing program instructions;

[0052] The processor is configured to detect, using a communication interface, first downlink control information (DCI) in a first search space; wherein the first DCI is used to indicate an activated bandwidth part (BWP) of a terminal device, the activated BWP being used for transmitting a physical data channel between the terminal device and the network device; the size of the first DCI is aligned with the size of the second DCI; the second DCI is DCI that can be transmitted in the first common search space; and the second DCI is used to schedule a system message, a paging message, or a random access response (RAR). The processor is configured to process (e.g., demodulate and decode) the received first DCI.

[0053] For the introduction of the first search space, the first DCI, the second DCI, etc., please refer to the first aspect and will not be repeated here.

[0054] In one possible design, the apparatus includes:

[0055] a memory for storing program instructions;

[0056] A processor is configured to detect, in a first specific search space of a terminal device, using a communication interface, first downlink control information (DCI), wherein the first DCI is used to indicate an activated bandwidth part (BWP) of the terminal device, and the activated BWP is used for transmitting a physical data channel between the terminal device and the network device; wherein the first specific search space is included in multiple specific search spaces of the terminal device, one specific search space among the multiple specific search spaces corresponds to N1 DCI formats, and the multiple specific search spaces correspond to N2 DCI formats in total, and the DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1. The processor is configured to process (demodulate and decode, etc.) the received first DCI.

[0057] For an introduction to the first DCI and alignment method, etc., please refer to the second aspect and will not be repeated here.

[0058] In an eighth aspect, an embodiment of the present application provides a device, comprising a processor for implementing the method described in the third or fourth aspect above. The device may further comprise a memory for storing instructions. The memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the method described in the third or fourth aspect above may be implemented. The device may further comprise a communication interface, wherein the communication interface is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, a circuit, a bus, a module, a pin, or other types of communication interfaces, and the other devices may be terminal devices.

[0059] In one possible design, the apparatus includes:

[0060] a memory for storing program instructions;

[0061] The processor is configured to use a communication interface to send first downlink control information (DCI) to a terminal device in a first search space; wherein the first DCI is used to indicate an activated bandwidth part (BWP) of the terminal device, the activated BWP is used for transmitting a physical data channel between the terminal device and a network device, the size of the first DCI is aligned with the size of the second DCI, the second DCI is DCI that can be transmitted in the first common search space, and the second DCI is used to schedule a system message, a paging message, or a random access response (RAR). The processor is configured to generate the first DCI.

[0062] For an introduction to the first DCI and the second DCI, etc., please refer to the first aspect and will not be repeated here.

[0063] In one possible design, the apparatus includes:

[0064] a memory for storing program instructions;

[0065] A processor is configured to use a communication interface to send first downlink control information (DCI) to a terminal device in a first specific search space of the terminal device, wherein the first DCI is used to indicate an activated bandwidth part (BWP) of the terminal device, and the activated BWP is used to transmit a physical data channel between the terminal device and a network device; wherein the first specific search space is included in multiple specific search spaces of the terminal device, one specific search space among the multiple specific search spaces corresponds to N1 DCI formats, and the multiple specific search spaces correspond to N2 DCI formats in total, and the DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1. The processor is configured to generate the first DCI.

[0066] For an introduction to the first DCI and alignment method, etc., please refer to the second aspect and will not be repeated here.

[0067] In the ninth aspect, an embodiment of the present application provides a communication system, comprising the apparatus of the fifth aspect or the seventh aspect, and the apparatus of the sixth aspect or the eighth aspect.

[0068] In a tenth aspect, an embodiment of the present application provides a computer-readable storage medium comprising instructions, which, when executed on a computer, enables the computer to execute the method described in the first aspect, the second aspect, the third aspect or the fourth aspect.

[0069] In an eleventh aspect, an embodiment of the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method described in the first aspect, the second aspect, the third aspect or the fourth aspect.

[0070] In a twelfth aspect, embodiments of the present application provide a chip system, which includes a processor and may also include a memory, for implementing the method described in the first, second, third, or fourth aspects above. The chip system may be composed of a chip, or may include a chip and other discrete devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 and Figure 2 The figure shows an example flow chart of the method provided in the embodiment of the present application;

[0072] Figure 3 and Figure 4 Shown is an example diagram of the device structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0073] The technical solutions provided in the embodiments of the present application can be applied to various communication systems, such as long-term evolution (LTE) systems, fifth-generation (5G) mobile communication systems, wireless-fidelity (WiFi) systems, future communication systems, or systems integrating multiple communication systems, etc., without limitation in the embodiments of the present application. 5G can also be referred to as new radio (NR).

[0074] The technical solutions provided by the embodiments of the present application can be applied to various communication scenarios, for example, one or more of the following communication scenarios: enhanced mobile broadband (eMBB) communication, ultra-reliable low-latency communication (URLLC), machine type communication (MTC), massive machine type communication (mMTC), device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, and Internet of Things (IoT). Optionally, mMTC may include one or more of the following communications: industrial wireless sensor network (IWSN) communication, communication in video surveillance scenarios, and communication with wearable devices.

[0075] The technical solution provided in the embodiment of the present application can be applied to communication between communication devices. Communication between communication devices may include: communication between network devices and terminal devices, communication between network devices and network devices, and / or communication between terminal devices and terminal devices. In the embodiment of the present application, the term "communication" can also be described as "transmission", "information transmission", or "signal transmission", etc. Transmission may include sending and / or receiving. The technical solution of the embodiment of the present application is described using the communication between network devices and terminal devices as an example. Those skilled in the art may also use this technical solution for communication between other scheduling entities and subordinate entities, such as communication between a macro base station and a micro base station, such as communication between a first terminal device and a second terminal device. Among them, the scheduling entity can allocate air interface resources to the subordinate entity. Air interface resources include one or more of the following resources: time domain resources, frequency domain resources, code resources, and space resources. In the embodiment of the present application, multiple can be two, three, four or more, and the embodiment of the present application is not limited.

[0076] In an embodiment of the present application, the communication between the network device and the terminal device includes: the network device sending a downlink signal or information to the terminal device, and / or the terminal device sending an uplink signal or information to the network device.

[0077] In the embodiments of this application, " / " can indicate that the objects associated with each other are in an "or" relationship. For example, A / B can mean A or B. "And / or" can be used to describe the existence of three relationships between the associated objects. For example, A and / or B can mean: A exists alone, A and B exists simultaneously, and B exists alone. A and B can be singular or plural. In the embodiments of this application, words such as "first" and "second" can be used to distinguish between technical features with the same or similar functions. The words "first" and "second" do not limit the quantity or execution order, and the words "first" and "second" do not necessarily mean different. In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. An embodiment or design described as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or design solutions. The use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete way to facilitate understanding.

[0078] The terminal device involved in the embodiments of the present application may also be referred to as a terminal, and may be a device with wireless transceiver capabilities. The terminal may be deployed on land, including indoors, outdoors, handheld, and / or vehicle-mounted; it may also be deployed on the water (such as a ship, etc.); it may also be deployed in the air (for example, on an airplane, a balloon, and a satellite, etc.). The terminal device may be a user equipment (UE), and the UE includes a handheld device, a vehicle-mounted device, a wearable device, or a computing device with wireless communication capabilities. Exemplarily, the UE may be a mobile phone, a tablet computer, or a computer with wireless transceiver capabilities. The terminal device may also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, and / or a wireless terminal in a smart home, etc.

[0079] The network devices involved in the embodiments of the present application include a base station (BS), which can be a device deployed in a wireless access network that can communicate wirelessly with a terminal device. A base station may have various forms, such as a macro base station, a micro base station, a relay station, or an access point. The base station involved in the embodiments of the present application can be a base station in a 5G system or a base station in an LTE system. Among them, the base station in the 5G system can also be called a transmission reception point (TRP) or a next-generation Node B (gNB or gNodeB).

[0080] In a communication system, such as an NR system or other system, a light terminal device can be introduced relative to a traditional terminal device, such as an eMBB terminal. The light terminal device may also be referred to as a reduced capability (REDCAP) terminal. The eMBB terminal is a terminal capable of transmitting eMBB services. Compared to a REDCAP terminal, the traditional terminal device may be a high-capability terminal or a terminal with unlimited capabilities. In an embodiment of the present application, the traditional terminal device may be replaced with a high-capability terminal relative to a REDCAP terminal introduced in the future. Exemplarily, the feature comparison between the high-capability terminal and the REDCAP terminal satisfies at least one of the following items 1 to 9. The at least one item may be one or more items, such as 2, 3 or more items, which are not limited in the embodiment of the present application.

[0081] The first item is: The maximum bandwidth supported by the high-capability terminal is greater than the maximum bandwidth supported by the REDCAP terminal. For example, the maximum bandwidth supported by the high-capability terminal is 100 MHz (megahertz) or 200 MHz, while the maximum bandwidth supported by the REDCAP terminal is 20 MHz, 10 MHz, or 5 MHz.

[0082] The second item: The high-capability terminal has more antennas than the REDCAP terminal. This number of antennas can be the number of antennas configured for the terminal, or the maximum number of antennas used for transmission and / or reception. For example, a high-capability terminal supports up to 4 antennas for reception and 2 antennas for transmission, while a REDCAP terminal supports up to 2 antennas for reception and 1 antenna for transmission. Alternatively, even if the high-capability terminal has the same number of antennas as an NR REDCAP terminal, its capabilities for antenna selective transmission differ. For example, a high-capability terminal and a low-capability terminal both support 2-antenna transmission, but the high-capability terminal supports antenna selective transmission, while the low-capability terminal does not. Taking single-antenna port data transmission as an example, a high-capability terminal can switch the single-antenna port data transmission between two transmit antennas, which can achieve spatial diversity gain. However, a low-capability terminal can only transmit data on two transmit antennas simultaneously, which is equivalent to the transmission performance of a single transmit antenna.

[0083] Item 3: The maximum transmit power supported by a high-capability terminal is greater than the maximum transmit power supported by a REDCAP terminal. For example, the maximum transmit power supported by a high-capability terminal is 23 decibel-milliwatt (dBm) or 26dBm, while the maximum transmit power supported by a REDCAP terminal is a value between 4dBm and 20dBm.

[0084] Item 4: High-capability terminals support carrier aggregation (CA), while REDCAP terminals do not support CA.

[0085] Item 5: When both high-capability terminals and REDCAP terminals support carrier aggregation, the maximum number of carriers supported by the high-capability terminal is greater than the maximum number of carriers supported by the REDCAP terminal. For example, a high-capability terminal supports a maximum of 32 carriers or 5 carrier aggregation, while a REDCAP terminal supports a maximum of 2 carrier aggregation.

[0086] Item 6: High-capability terminals and REDCAP terminals were introduced in different protocol versions. For example, in the NR protocol, high-capability terminals were introduced in Release (R) 15, and REDCAP terminals were introduced in Release 17.

[0087] Item 7: High-capability terminals and REDCAP terminals have different duplex capabilities. High-capability terminals have stronger duplex capabilities. For example, high-capability terminals support full-duplex frequency division duplex (FDD), meaning they can receive and transmit simultaneously when supporting FDD. REDCAP terminals support half-duplex FDD, meaning they cannot receive and transmit simultaneously when supporting FDD.

[0088] Item 8: The data processing capability of a high-capability terminal is greater than that of a REDCAP terminal. A high-capability terminal can process more data in the same amount of time, or a high-capability terminal can process the same data in a shorter amount of time. For example, let T1 be the time it takes for a terminal to receive downlink data from a network device, and T2 be the time it takes for the terminal to send feedback on the downlink data to the network device after processing the downlink data. The delay (time difference) between T2 and T1 for a high-capability terminal is less than the delay between T2 and T1 for a REDCAP terminal. The feedback for the downlink data can be either ACK or NACK feedback.

[0089] Item 9: The peak data transmission rate of the high-capability terminal is greater than the peak data transmission rate of the REDCAP terminal. Data transmission includes uplink data transmission (i.e., the terminal sends data to the network device) and / or downlink data transmission (i.e., the terminal receives data from the network device).

[0090] Optionally, for ease of distinction, in the embodiment of the present application, the high-capability terminal may also be referred to as a non-REDCAP terminal.

[0091] REDCAP terminals can be applied in various scenarios, including the Internet of Things, mMTC, and V2X. In one possible design, REDCAP terminals are required to consume less power than high-capability terminals. The lower the power consumption of a REDCAP terminal, the longer its battery life and the better the user experience. Furthermore, some REDCAP terminals are deployed in unique environments (such as underground pipelines and in suburban areas), making it difficult to adjust the power supply system. In this case, reducing the power consumption of REDCAP terminals can simplify their subsequent maintenance and improve the user experience. Therefore, reducing the power consumption of REDCAP terminals is a topic worthy of research.

[0092] Optionally, in an embodiment of the present application, the terminal device may send indication information to the network device, indicating the type or capability information of the terminal device. Optionally, it may indicate whether the type of the terminal is a REDCAP terminal or a high-capability terminal. Optionally, it may indicate one or more of the following capability information of the terminal: the maximum bandwidth supported, the number of antennas supported, the maximum transmit power supported, whether carrier aggregation is supported, the number of carriers supported, the corresponding protocol version, duplex capability, data processing capability, and peak rate. Based on this design, for example, when the method provided in an embodiment of the present application can be applied to a REDCAP terminal but not to other high-capability terminals, the network device can obtain the type of the terminal device through the indication information, thereby performing the correct operation, so that the network device and the terminal device can exchange information normally.

[0093] Optionally, the method provided in the embodiment of the present application can also be applied to other types of terminals, such as high-capability terminals (such as eMBB terminals, or URLLC terminals that support URLLC services), to reduce terminal power consumption and further improve user experience. To simplify the description, the embodiment of the present application can be described using a REDCAP terminal as an example.

[0094] In the embodiment of the present application, the device for realizing the function of the terminal device may be a terminal device; or it may be a device capable of supporting the terminal device to realize the function, such as a chip system. The device may be installed in the terminal device or used in combination with the terminal device. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, the device for realizing the function of the terminal device is a terminal device, and the terminal device is a UE as an example to describe the technical solution provided in the embodiment of the present application.

[0095] In the embodiments of the present application, the apparatus for implementing the functions of a network device may be a network device; or it may be a device capable of supporting the network device in implementing the functions, such as a chip system. The apparatus may be installed in the network device or used in conjunction with the network device. In the technical solutions provided in the embodiments of the present application, the technical solutions provided in the embodiments of the present application are described by assuming that the apparatus for implementing the functions of the network device is a network device, and that the network device is a base station.

[0096] In a communication system, a UE can access a base station and communicate with the base station. For example, a base station can manage one or more (e.g., 2, 3, or 6) cells, and a UE can access the base station in at least one of the one or more cells and communicate with the base station in the cell accessed by the UE. In an embodiment of the present application, the at least one may be 1, 2, 3, or more, and this embodiment of the present application does not impose any limitation.

[0097] When a base station and a UE communicate, the base station can send downlink control information (DCI) to the UE via a downlink control channel to schedule a physical data channel. For example, the DCI can be used to schedule a physical downlink data channel, over which the base station sends downlink data to the UE. Alternatively, the DCI can be used to schedule a physical uplink data channel, over which the UE sends uplink data to the base station.

[0098] In the embodiment of the present application, the downlink control channel may be a physical downlink control channel (PDCCH), an enhanced PDCCH (enhanced PDCCH), an MTC PDCCH (MPDCCH), a narrowband PDCCH (NPDCCH), or other types of downlink control channels for carrying DCI. The embodiment of the present application does not limit the name or type of the downlink control channel. To simplify the description, the embodiment of the present application is described as an example in which the downlink control channel is a PDCCH.

[0099] When a physical data channel is scheduled by DCI, the UE needs to receive DCI from the base station for data transmission. When receiving DCI, the UE may need to perform multiple blind detections. The greater the number of blind detections, the greater the UE's power consumption. To reduce UE power consumption, the number of blind detections performed by the UE can be reduced. To reduce the number of blind detections performed by the UE, the variety of DCI sizes can be reduced. Based on this, embodiments of the present application provide the following design solutions.

[0100] The first design : The size of the common DCI transmitted in the first common search space and the size of the first DCI transmitted in the first search space are aligned. The first DCI is used to indicate the active bandwidth part (BWP) of the UE.

[0101] In one possible implementation, Figure 1As shown, in the first search space, the base station sends a first DCI to the UE. The first DCI is used to indicate the activated BWP of the UE. The size of the first DCI is the same as the size of the second DCI, and the second DCI is a DCI that can be transmitted in the first public search space, and the second DCI is used to schedule public messages. The first DCI can also be used to schedule physical data channels, such as physical downlink data channels or physical uplink data channels. The physical data channels scheduled by the first DCI are transmitted on the activated BWP of the UE. Optionally, the first search space is the first specific search space of the UE. Optionally, the base station can send the second DCI to the UE in the first public search space, that is, the first search space can also be the first public search space. In some embodiments of the present application, in order to simplify the description, the first search space can be described as the first specific search space.

[0102] In an embodiment of the application, the physical downlink data channel may be a physical downlink shared channel (PDSCH) or other downlink data channel, which is used to carry downlink data sent by the base station to the UE. The name or type of the physical downlink data channel is not limited in the embodiment of the present application. In order to simplify the description, the embodiment of the present application is described as an example in which the physical downlink data channel is PDSCH. The DCI for scheduling PDSCH is carried on the PDCCH and sent by the base station to the UE. When DCI is used to schedule PDSCH, the DCI may indicate the transmission parameters of the PDSCH, which are used for the UE to receive the PDSCH. The transmission parameters may include one or more of the transmission parameters included in the DCI format 1_0 and / or DCI format 1_1 below.

[0103] In an embodiment of the application, the physical uplink data channel may be a physical uplink shared channel (PUSCH) or other uplink data channel, which is used to carry uplink data sent by the UE to the base station. The name or type of the physical uplink data channel is not limited in the embodiment of the present application. In order to simplify the description, the embodiment of the present application is described as an example in which the physical uplink data channel is PUSCH. The DCI for scheduling PUSCH is carried on the PDCCH and sent by the base station to the UE. When DCI is used to schedule PUSCH, the DCI may indicate the transmission parameters of the PUSCH, which are used by the UE to send PUSCH. The transmission parameters may include one or more of the transmission parameters included in the DCI format 0_0 and / or DCI format 0_1 below.

[0104] In the embodiment of the present application, two types of DCI can be set for the transmission direction scheduled by DCI.

[0105] For example, the DCI for scheduling the PUSCH may be referred to as the first type of DCI, and the DCI for scheduling the PDSCH may be referred to as the second type of DCI. The format of the first type of DCI may include DCI format 0_0, DCI format 0_1, or other first type of DCI formats described below, and the format of the second type of DCI may include DCI format 1_0, DCI format 1_1, or other second type of DCI formats described below. DCI format 0_0 may also be referred to as DCI 0_0, DCI format 0_1 may also be referred to as DCI 0_1, DCI format 1_0 may also be referred to as DCI 1_0, and DCI format 1_1 may also be referred to as DCI 1_1. The format of the first type of DCI in the other format is different from DCI format 0_0 or DCI format 0_1, and the first type of DCI in the other format may include one or more of the transmission parameters included in DCI format 0_0 and / or DCI format 0_1; the format of the second type of DCI in the other format is different from DCI format 1_0 or DCI format 1_1, and the second type of DCI in the other format may include one or more of the transmission parameters included in DCI format 1_0 and / or DCI format 1_1. For PDSCH or PUSCH, fallback DCI and non-fallback DCI can be designed. For example, the format of the fallback DCI for PUSCH is DCI 0_0, the format of the non-fallback DCI for PUSCH is DCI 0_1, the format of the fallback DCI for PDSCH is DCI 1_0, and the format of the non-fallback DCI for PDSCH is DCI 1_1. The non-fallback DCI indicates more types of information than the fallback DCI, and the non-fallback DCI supports more functions. For example, as shown in Table 1, the fallback DCI does not support bandwidth part (BWP) switching, while the non-fallback DCI supports BWP switching.

[0106] Table 1

[0107]

[0108] Below, the specific contents of BWP, BWP switching, DCI format, and search space in the embodiments of the present application will be introduced in turn.

[0109] BWP and BWP Switch

[0110] In an embodiment of the present application, a cell may correspond to a downlink carrier. A cell may be equivalent to a downlink carrier. For example, a cell may correspond to a downlink carrier and an uplink carrier; or, a cell may correspond to a downlink carrier, an uplink carrier and a supplementary uplink (SUL) carrier. For example, in an LTE system, a cell may correspond to a downlink carrier and an uplink carrier. For example, in an NR system, a cell may correspond to a downlink NR carrier and an uplink NR carrier, or a cell may correspond to a downlink NR carrier, an uplink NR carrier and a SUL carrier. The UE may send an uplink signal to the base station on the NR carrier based on the NR technology. The SUL carrier may be regarded as a carrier shared by the NR system and LTE. The UE may send an uplink signal to the base station on the SUL carrier based on the NR technology or the LTE technology.

[0111] A carrier, such as an uplink carrier or a downlink carrier, can correspond to a frequency resource in the frequency domain. The center frequency and frequency range of the carrier can be set, or the starting and ending frequencies of the carrier can be set. For FDD systems, downlink carriers and uplink carriers have different frequency ranges. For time division duplex (TDD) systems, a carrier can be configured as an uplink carrier or a downlink carrier in a time-division manner.

[0112] A BWP or a BWP pair may be configured for the UE in the carrier. The method of the embodiment of the present application can be used for both a design based on a BWP pair and a design based on a BWP.

[0113] In an embodiment of the present application, in a design based on BWP pairs: a BWP can be used for downlink signal transmission or uplink signal transmission, but cannot be used for both downlink and uplink signal transmission. In this design, when the base station and the UE communicate on a carrier, one or more BWP pairs can be configured for the UE from the resources of the carrier for communication between the base station and the UE. A BWP pair may include at least one downlink BWP and at least one uplink BWP. For example, a BWP pair includes a downlink BWP and an uplink BWP, or a BWP pair includes a downlink BWP, an uplink BWP and a supplementary uplink (SUL) BWP. A BWP, such as a downlink BWP or an uplink BWP, may include a continuous frequency domain resource, such as one or more continuous subcarriers, resource blocks (RBs), or resource block groups (RBGs). For each BWP, the base station may configure one or more of the following parameters of the BWP for the UE: frequency domain resource location, BWP identifier (ID), subcarrier spacing, and cyclic prefix (CP) type.

[0114] When a base station and a UE communicate on a BWP pair, downlink signal transmission is performed on the downlink BWP of the BWP pair, and uplink signal transmission is performed on the uplink BWP of the BWP pair. For example, the base station sends paging messages, synchronization signals, broadcast channels, PDCCH, PDSCH, and downlink reference signals to the UE on the downlink BWP; and / or the UE sends PUSCH, PUCCH, and uplink reference signals to the base station on the uplink BWP. In this embodiment of the present application, the synchronization signal and broadcast channel may be included in a synchronization signal block (SSB).

[0115] Optionally, the base station may configure one or more (for example, 2, 3, 4 or other numbers) candidate BWP pairs for the UE. When multiple candidate BWP pairs are configured for the UE, the base station may configure at least one activated BWP pair for the UE from the multiple candidate BWP pairs. Exemplarily, the base station may indicate the BWP pair activated for the UE from multiple candidate BWP pairs through the BWP indication field in the DCI. As another example, when a DCI is used to schedule PDSCH, the DCI may include a BWP indication field for indicating the downlink BWP activated for the UE from multiple downlink BWPs of multiple candidate BWP pairs of the UE; and / or, when a DCI is used to schedule PUSCH, the DCI may include a BWP indication field for indicating the uplink BWP activated for the UE from multiple uplink BWPs of multiple candidate BWP pairs of the UE.

[0116] In an embodiment of the present application, in a BWP-based design, a BWP can be used for both downlink and uplink signal transmission. In this design, when a base station and a UE communicate on a carrier, one or more BWPs can be configured for the UE from the carrier's resources for communication between the base station and the UE. A BWP can include a continuous frequency domain resource, such as one or more continuous subcarriers, RBs, or RBGs. The BWP can include an uplink portion and / or a downlink portion. For each BWP, the base station can configure one or more of the following parameters of the BWP for the UE: frequency domain resource location, BWP ID, subcarrier spacing, and CP type.

[0117] Exemplarily, for a BWP, when the base station and the UE communicate on the BWP, if the BWP includes a downlink part, the base station sends a paging message, a synchronization signal, a broadcast channel, a PDCCH, a PDSCH, and a downlink reference signal to the UE on the downlink part of the BWP; and / or, if the BWP includes an uplink part, the UE sends a PUSCH, a PUCCH, and an uplink reference signal, etc. to the base station on the uplink part of the BWP.

[0118] Optionally, the base station may configure one or more candidate BWPs for the UE. When multiple candidate BWPs are configured for the UE, the base station may configure at least one active BWP for the UE from the multiple candidate BWPs. The active BWP is used for data transmission between the base station and the UE. Exemplarily, the base station may indicate the BWP that is activated for the UE from the multiple candidate BWPs using a BWP indication field included in the DCI.

[0119] An activated BWP (pair) can be used for data transmission between the base station and the UE, and an inactivated BWP (pair) cannot be used for data transmission between the base station and the UE. For example, an activated BWP (pair) can be used for PDCCH, PDSCH, PUSCH, and PUCCH transmission between the base station and the UE, while an inactivated BWP (pair) cannot be used to transmit these channels. Optionally, the UE can perform radio resource management (RRM) measurements on an inactivated BWP (pair). For example, the UE can measure the reference signal received power (RSRP) or reference signal received quality (RSRQ) based on reference signals such as SSB or channel state information-reference signal (CSI-RS). By indicating the activated BWP (pair) of the UE, the activated BWP (pair) of the UE can be switched to make full use of the frequency diversity gain.

[0120] The working mode of the design based on BWP pair and the design based on BWP is similar, and the difference is mainly as described above. In order to simplify the description, the embodiment of the present application is described by taking the design based on BWP as an example.

[0121] In the embodiment of the present application, the bandwidth of the activated BWP of the UE may be less than or equal to the bandwidth capability of the UE, or may be greater than the bandwidth capability of the UE, and this embodiment of the present application does not impose any restrictions. The bandwidth capability of the UE may be expressed as the maximum bandwidth (including the guard band) that the UE and the base station can use simultaneously when performing data transmission. For example, the bandwidth capability of the UE may be 20 MHz, 10 MHz, or 5 MHz.

[0122] Specific content of the DCI format

[0123] In the embodiment of the present application, the DCI format is used to define the type of information fields included in the DCI and to define the length of each information field in the DCI. The length of an information field in the DCI refers to the number of bits included in the information field.

[0124] Exemplarily, DCI 1_0 includes one or more of the following information fields. The present embodiment does not limit the name of DCI 1_0. For example, DCI 1_0 may also be called a downlink fallback DCI format, a first DCI format, or DCI4_0, which is not limited in the present embodiment.

[0125] (1) The identifier for DCI formats field is set to 1, indicating that the DCI is a downlink DCI format, that is, used for scheduling PDSCH.

[0126] In the embodiment of the present application, the size or length of an information field can be understood as the number of bits included in the information field.

[0127] (2) Frequency domain resource allocation field, used to indicate the frequency domain resources allocated for PDSCH.

[0128] (3) Time domain resource allocation field, used to indicate the time domain resources allocated for PDSCH.

[0129] (4) The mapping field from virtual resource block (VRB) to physical resource block (PRB) is used to indicate whether the frequency domain resources allocated for PDSCH are centralized resource allocation or distributed resource allocation.

[0130] (5) Modulation and coding scheme (MCS) field, used to indicate the modulation mechanism and coding mechanism (such as code rate) of the PDSCH.

[0131] (6) New data indicator (NDI) field, used to indicate whether the downlink data transmitted on the PDSCH is a new transmission or a retransmission.

[0132] (7) Redundancy version (RV) field, used to indicate the redundancy version of PDSCH.

[0133] (8) The HARQ process number (HPN) field is used to indicate the hybrid automatic repeat request (HARQ) process number of the PDSCH.

[0134] (9) Downlink assignment index (DAI) field, used to indicate the number of downlink transmission time units in which PDSCH is transmitted within the HARQ-based PDSCH transmission window. The transmission time unit may be a transmission time interval, a time slot, a subframe, or other time unit, which is not limited in this embodiment.

[0135] (10) The TPC command for scheduled PUCCH field is used to control the transmit power of the UE when sending PUCCH.

[0136] (11) The PUCCH resource indicator field is used to indicate the uplink transmission resources required by the UE to send uplink control information. The uplink control information may include PDSCH acknowledgment (ACK) / negative acknowledgment (NACK), and / or channel state information (CSI). The uplink transmission resources may include time-frequency resources and the type of PUCCH format to be used. Different PUCCH formats can be distinguished by the number of symbols occupied by the PUCCH in time, the sequence form used to transmit uplink control information, and the orthogonality of different sequences.

[0137] (12) The PDSCH-to-HARQ feedback timing indicator field is used to indicate the relationship between the time when the UE sends HARQ feedback of the PDSCH to the base station and the time when the UE receives the PDSCH from the base station.

[0138] (13) Reserved bit field, including one or more bits.

[0139] Exemplarily, in addition to the information fields included in DCI 1_0, DCI 1_1 also includes one or more of the following information fields. The present embodiment does not limit the name of DCI 1_1. For example, DCI 1_1 may also be referred to as a downlink non-fallback DCI format, a second DCI format, or DCI format 4_1, which is not limited in the present embodiment.

[0140] (1) Carrier indicator field, used to indicate the carrier where the frequency domain resources allocated for PDSCH are located. This information field enables cross-carrier scheduling, that is, the carrier carrying the control information for scheduling PDSCH is different from the carrier carrying PDSCH.

[0141] (2) The BWP indicator field is used to indicate the active BWP of the UE. The frequency domain resources allocated for the PDSCH are on this active BWP. This field enables cross-BWP scheduling, i.e., the BWP that carries the control information for scheduling the PDSCH is different from the BWP that carries the PDSCH.

[0142] (3) More MCS fields, NDI fields, and RV fields corresponding to transport blocks (TBs). For example, DCI 1_0 can include the MCS field, NDI field, and RV field corresponding to one transport block, and DCI 1_1 can indicate the MCS field, NDI field, and RV field corresponding to two transport blocks respectively.

[0143] (4) Antenna port indication field, indicating the antenna port corresponding to the demodulation reference signal (DMRS) used to demodulate PDSCH;

[0144] (5) Transmission Configuration Indicator field, used to indicate the quasi-co-location (QCL) relationship between different reference signals or different transmission channels. Reference signals may include synchronization signal blocks (SSBs), demodulation reference signals (DMRSs), CSI-RSs, and phase tracking reference signals (PTRSs). Transmission channels may include PDCCHs and PDSCHs.

[0145] (6) The code block group (CBG) transmission information (CBGTI) field is used to indicate the transmission information of the code blocks included in the transport block TB scheduled by the DCI.

[0146] (7) The CBG flushing out information (CBGFI) field is used to indicate which CBGs can be processed by the merged reception and which CBGs cannot be processed by the merged reception.

[0147] In the embodiment of the present application, the field used to indicate the activation of the BWP in DCI 1_1 and DCI 0_1 below can be a BWP indication field or a field with another name, which is not limited in the embodiment of the present application. For example, the base station can reuse some or all bits in the DAI field to indicate the activation of the UE's BWP, or the base station can use the redundant state of the frequency domain resource allocation field to indicate the activation of the UE's BWP, etc.

[0148] Exemplarily, DCI 0_0 is used to schedule uplink data transmission and includes one or more of the following information fields. The present embodiment does not limit the name of DCI 0_0. For example, DCI 0_0 may also be referred to as an uplink fallback DCI format, a third DCI format, or DCI 3_0, etc., which is not limited in the present embodiment.

[0149] (1) The identifier for DCI formats field is set to 0, indicating that the DCI is an uplink DCI format, that is, used for scheduling PUSCH.

[0150] (2) Frequency domain resource allocation field, used to indicate the frequency domain resources allocated for PUSCH.

[0151] (3) Time domain resource allocation field, used to indicate the time domain resources allocated for PUSCH.

[0152] (4) Frequency Hopping Identifier field, used to indicate whether the UE uses frequency hopping to transmit PUSCH.

[0153] (5) MCS field, used to indicate the modulation scheme and coding scheme (e.g., code rate) of the PUSCH;

[0154] (6) NDI field, used to indicate whether the uplink data transmitted on the PUSCH is a new transmission or a retransmission;

[0155] (7) RV field, used to indicate the redundancy version of PUSCH;

[0156] (8) HPN domain: has the same meaning as that in DCI 1_0, except that PDSCH is replaced by PUSCH, which will not be described in detail.

[0157] (9) The TPC command for scheduled PUSCH field is used to control the transmit power of the UE when sending PUSCH.

[0158] (10) Uplink / supplement uplink (SUL) indication field, indicating whether the carrier used to carry the scheduled PUSCH is an uplink carrier or a supplementary uplink carrier.

[0159] Exemplarily, in addition to the information fields included in DCI 0_0, DCI 0_1 also includes one or more of the following information fields. The present embodiment does not limit the name of DCI 0_1. For example, DCI 0_1 may also be called an uplink non-fallback DCI format, a fourth DCI format, or DCI 3_1, etc., which is not limited in the present embodiment.

[0160] (1) Carrier indicator field, used to indicate the carrier where the frequency domain resources allocated for PUSCH are located. This information field enables cross-carrier scheduling, that is, the carrier carrying the control information for scheduling PUSCH is different from the carrier carrying PUSCH.

[0161] (2) Bandwidth Part Indicator field, used to indicate the active BWP of the UE. The frequency domain resources allocated for PUSCH are on this active BWP. This information field enables cross-BWP scheduling, i.e., the BWP carrying the control information for scheduling PUSCH is different from the BWP carrying PDSCH.

[0162] (3) DAI domain, similar to DAI in DCI format 1_0, except that PDSCH is replaced by PUSCH, which will not be described in detail.

[0163] (4) Sounding Reference Signal (SRS) resource indication field, used to indicate the SRS resource. SRS can be sent by the UE to the base station.

[0164] (5) The precoding information and number of layers field is used to indicate the precoding information and number of transmission layers of the PUSCH.

[0165] (6) Antenna port indication field: used to indicate the antenna port of the PUSCH DMRS.

[0166] (7) SRS request indication field, used to trigger the UE to send aperiodic SRS.

[0167] (8) Channel state information (CSI) request indication field, used to trigger the UE to send CSI.

[0168] (9) CBGTI domain is similar to the CBGTI domain in DCI format 1_1, except that PDSCH is replaced by PUSCH, which will not be described in detail.

[0169] Figure 1In the method shown, the size of the first DCI is set to be aligned with the size of the second DCI. The format of the first DCI may be the above-mentioned DCI 0_1 or DCI 1_1, or may be a DCI of other formats, which is not limited in the embodiment of the present application. The DCI of other formats is used to indicate the activation of the UE's BWP and has a BWP switching function. The DCI of other formats may include one or more parameters of DCI 0_0, DCI 0_1, DCI 1_0 and / or DCI 1_1. This embodiment of the present application is not limited.

[0170] After the first DCI indicates the activated BWP of the UE, before the base station updates the activated BWP of the UE through another DCI (the format may be the same as the first DCI, or may be a DCI of another format that can indicate the activated BWP), the base station and the UE may transmit PDSCH and / or PUSCH on the activated BWP indicated by the first DCI. If the first DCI is also used to schedule a physical data channel, the physical data channel is transmitted on the activated BWP indicated by the first DCI.

[0171] Figure 1 The format of the second DCI in the method shown may be the above-mentioned DCI 0_0 or DCI 1_0, or may be a DCI of other formats, which is not limited in the embodiment of the present application. The DCI of other formats is not used to indicate the activation of the UE's BWP and does not have a BWP switching function. The DCI of other formats may include one or more parameters of DCI 0_0, DCI 0_1, DCI 1_0, and / or DCI 1_1. The embodiment of the present application is not limited.

[0172] Search Space

[0173] In an embodiment of the present application, one or more search spaces may be configured for a UE. For a search space, the search space may include one or more parameters, any of which may be predefined by the protocol or indicated to the UE by the base station via signaling. The configuration methods for different parameters in the same search space may be the same or different, and the configuration methods for parameters in different search spaces may be the same or different, which is not limited in the embodiment of the present application.

[0174] The search space of the UE may be configured (indicated) by the base station for the UE through signaling, or may be predefined. On a BWP of the UE or on a carrier, one or more search spaces may be configured for the UE.

[0175] In the embodiment of the present application, unless otherwise specified, the signaling sent by the base station to the UE can be any one of the following signaling: broadcast message, system information, radio resource control (RRC) signaling, media access control (MAC) control element (CE), or DCI.

[0176] For a search space, the type of the search space can be configured as a common search space (CSS) or a UE-specific search space (USS) in a predefined manner or by the base station indicating it to the UE through signaling. For a UE, the characteristics of the common search space and the UE-specific search space are as follows: the DCI transmitted in the common search space is common DCI, which is for all UEs in the cell where the UE is located, or the common DCI is for a group of UEs in the cell where the UE is located, and the group of UEs is part of the UEs in the cell; the DCI transmitted in the UE-specific search space is UE-specific DCI, which is for the UE. Furthermore, the common search space can be configured to allow the transmission of UE-specific DCI.

[0177] Figure 1 In the method shown, the second DCI is a public DCI.

[0178] In an embodiment of the present application, the cyclic redundancy check (CRC) bits of the public DCI can be scrambled by the base station according to the public radio network temporary identifier (RNTI). Accordingly, when the UE detects the public DCI, it uses the public RNTI to attempt to descramble the DCI. If the descrambling is correct, it is considered that the public DCI has been received. The public RNTI can be known to the UE, for example, it is predefined by the protocol, or it is indicated to the UE in advance by the base station. In an embodiment of the present application, the public RNTI includes but is not limited to: system information RNTI (SI-RNTI), paging RNTI (P-RNTI), or random access RNTI (RA-RNTI).

[0179] In an embodiment of the present application, public DCI may be used to schedule public information. The public information may be carried on a physical data channel scheduled by the public DCI. The public information includes, but is not limited to, system messages, paging messages, or random access responses (RARs).

[0180] Exemplarily, for a public DCI, the CRC bit of the DCI is scrambled according to the SI-RNTI, and the PDSCH scheduled by the DCI carries a system information block (SIB), which is used to broadcast system messages to UEs in the cell; the CRC bit of the DCI is scrambled according to the P-RNTI, and the PDSCH scheduled by the DCI carries a paging message, which is used to page a group of UEs; or, the CRC bit of the DCI is scrambled according to the RA-RNTI, and the PDSCH scheduled by the DCI carries an RAR.

[0181] Figure 1 In the method shown, the first DCI is a UE-specific DCI. In an embodiment of the present application, the CRC bits of the UE-specific DCI can be scrambled by the base station according to the UE-specific RNTI. Accordingly, when the UE detects a specific DCI, it uses the UE-specific RNTI to attempt to descramble the DCI. If the descrambling is correct, it is considered that the UE-specific DCI has been received. The UE-specific RNTI includes, but is not limited to: cell radio network temporary identifier (C-RNTI), semi-persistent scheduling (SPS)-RNTI, MCS-C-RNTI, semi-persistent channel state information (SP-CSI)-RNTI, or configured scheduling (CS)-RNTI.

[0182] In this embodiment of the present application, one or more common search spaces may be configured. The first common search space may be one or more (partial or all) common search spaces among the multiple common search spaces. One or more UE-specific search spaces may be configured for the UE, which is not limited in this embodiment of the present application. The first specific search space may be one or more specific search spaces among the multiple specific search spaces of the UE.

[0183] In an embodiment of the present application, it can also be set that UE-specific DCI can be transmitted in a public search space. For example, it can be set that the first DCI can be transmitted in the second public search space. That is, the first search space can be the second public search space. The second public search space and the first public search space can be the same or different, and the embodiment of the present application does not limit this. When a DCI of a certain size but scrambled by multiple different RNTIs is transmitted in a search space, the UE can obtain the type of the DCI by descrambling the DCI. For example, in the second public search space, the base station can send a specific DCI scrambled by a specific RNTI and a public DCI scrambled by a public RNTI to the UE. When the UE blindly detects the DCI, it can obtain the RNTI used to scramble the DCI by descrambling the DCI, so that it can be determined whether the DCI is UE-specific DCI or public DCI.

[0184] For a search space, one or more of the following parameters of the search space can be configured in a predefined manner or by the base station indicating to the UE through signaling: frequency domain resource location, aggregation level size, number of candidate PDCCHs, detection period, time domain resource location, format of the DCI corresponding to the search space (i.e., format of the DCI that can be transmitted in the search space), and size of the DCI transmitted in the search space. Among them, the time domain resource location includes: the first time unit (such as time slot) offset of the search space in the detection period, the number of consecutive first time units occupied by the search space in the detection period, the second time unit (such as symbol) offset of the search space in each first time unit, and the number of second time units occupied by the search space in each first time unit.

[0185] Optionally, the frequency domain resource position of the search space and the number of second time units of the search space in each first time unit can be configured in the following manner: the base station indicates the control resource set (CORESET) corresponding to the search space to the UE, and the parameters of the CORESET can be regarded as the parameters of the search space.

[0186] For a CORESET, the following configurations may be used: a frequency domain resource location and the number of second time units of the CORESET in each first time unit, either in a predefined manner or as indicated by the base station to the UE via signaling. Optionally, a CORESET may correspond to one search space or to multiple different search spaces, which is not limited in this embodiment of the present application.

[0187] Exemplarily, search space A corresponds to CORESET A, which occupies three symbols in the time domain. The detection period of search space A is 10 time slots, the offset of search space A within the detection period is 3 time slots, and the consecutive time slots occupied by search space A within the detection period are 2 time slots, with the symbol offset of search space A in each time slot being 3 symbols. The time domain location of search space A is: symbols 4 to 6 in the 4th time slot and 5th time slot in every 10 time slots. That is, in every 10 time slots, the time domain location of search space A is symbols 4 to 6 in the 4th time slot and symbols 4 to 6 in the 5th time slot. The frequency domain resources of search space A are the same as those of CORESET A.

[0188] Figure 1 In the method described, the DCI size (first DCI) transmitted in the UE's first search space is the same as the DCI size (second DCI) transmitted in the UE's first common search space, that is, the first search space and the first common search space are configured with the same DCI size, which can reduce the number of times the UE blindly detects the PDCCH.

[0189] For example, the first search space is the first specific search space. When the UE detects DCI in the first specific search space or the first public search space, the UE does not know whether the base station will send DCI in the search space, nor does it know how many DCIs of the corresponding type the base station will send. In addition, if the search space corresponds to DCIs of multiple sizes, for example, corresponding to DCI formats of multiple sizes of different sizes, and / or DCI of one format is scrambled by different RNTIs, resulting in different DCI sizes. At this time, when the UE detects DCI in the search space, the UE needs to perform blind detection on each PDCCH candidate resource position in the search space at most through blind detection, and needs to perform blind detection on each PDCCH candidate resource position according to each size of DCI at most in an attempt to receive the DCI transmitted in the search space. The UE may receive DCI in the search space, or may not receive DCI in the search space. When the first public search space and the first specific search space have overlapping parts, through Figure 1 The method shown can reduce the number of times a UE blindly detects PDCCHs. For example, for each PDCCH candidate resource location in the overlapping portion, if the DCI sizes of the first common search space and the first specific search space are different, the UE needs to detect twice as many times. However, if the DCI sizes of the first common search space and the first specific search space are the same, the UE only needs to detect once.

[0190] For example, Figure 2 A schematic diagram of a process for transmitting a first DCI and a second DCI between a base station and a UE.

[0191] Operation 201: A base station sends configuration information of a first common search space to a UE. Correspondingly, the UE receives the configuration information of the first common search space.

[0192] The message carrying the configuration information of the first public search space may also carry configuration information of other public search spaces (eg, the second public search space), which is not limited in this embodiment of the present application.

[0193] In operation 202, the base station sends configuration information of a first specific search space to the UE. Accordingly, the UE receives the configuration information of the first specific search space.

[0194] The message carrying the configuration information of the first specific search space may also carry configuration information of other specific search spaces (eg, the second specific search space), which is not limited in this embodiment of the present application.

[0195] Optionally, the configuration information of the first public search space in operation 201 and the configuration information of the first specific search space in operation 202 may be carried in one message or in different messages, which is not limited in this embodiment of the present application.

[0196] Optionally, in operation 203, the base station sends a second DCI to the UE in the first common search space, where the second DCI is used to schedule common information. Accordingly, the UE detects the second DCI from the base station in the first common search space.

[0197] Optionally, in operation 204, the base station sends the common information scheduled by the second DCI to the UE. Correspondingly, the UE receives the common information sent by the base station.

[0198] For example, in the first common search space, the base station sends a second DCI to the UE. Furthermore, the base station sends the UE a PDSCH scheduled by the second DCI, which carries a system message. Accordingly, the UE detects the second DCI from the base station in the first common search space. The UE may or may not detect the second DCI. If the UE detects the second DCI, it may receive the PDSCH using the transmission parameters indicated by the second DCI, and obtain the system message carried on the PDSCH.

[0199] Exemplarily, in the first public search space, the base station sends two second DCIs to the UE. In addition, the base station sends the PDSCH scheduled by the first second DCI to the UE, and the PDSCH carries a system message; and sends the PDSCH scheduled by the second second DCI to the UE, and the PDSCH carries a paging message. Accordingly, the UE detects the second DCI from the base station in the first public search space. The UE may detect one second DCI, two DCIs, or no second DCI. If the UE detects the first second DCI, it can receive the PDSCH using the transmission parameters indicated by the second DCI to obtain the system message carried on the PDSCH. If the UE detects the second second DCI, it can receive the PDSCH using the transmission parameters indicated by the second DCI to obtain the paging message carried on the PDSCH.

[0200] Optionally, in operation 205 , the base station sends a first DCI to the UE in a first specific search space.

[0201] Optionally, in operation 206 , the base station and the UE transmit a PDSCH or a PUSCH scheduled by the first DCI.

[0202] For example, in a first specific search space, the base station sends a first DCI to the UE. In addition, the base station sends a PDSCH scheduled by the first DCI to the UE, and the PDSCH carries specific information about the UE. Accordingly, the UE detects the first DCI from the base station in the first specific search space. The UE may or may not detect the first DCI. If the UE detects the first DCI, it can receive the PDSCH using the transmission parameters indicated by the first DCI to obtain the specific information about the UE carried on the PDSCH.

[0203] Exemplarily, in the first specific search space, the base station sends two first DCIs to the UE, wherein the first first DCI is used to schedule PDSCH and the second first DCI is used to schedule PUSCH. In addition, the base station sends the PDSCH scheduled by the first first DCI to the UE, and the PDSCH carries specific information of the UE. Accordingly, the UE detects the first DCI from the base station in the first specific search space, and the UE may detect one first DCI, two first DCIs, or no first DCI. If the UE detects the first first DCI, it can use the transmission parameters indicated by the first DCI to receive the PDSCH and obtain the specific information of the UE carried on the PDSCH. If the UE detects the second first DCI, it can use the transmission parameters indicated by the first DCI to send the PUSCH to the base station, and the PUSCH carries specific information of the UE.

[0204] Optionally, the base station may also send the first DCI to the UE in the first common search space. The operations are similar to those in steps 205 and 206, except that the first specific search space is replaced with the first common search space. These operations are not further described here. In this case, the UE attempts to descramble the DCI using possible RNTIs in the first common search space. If the descrambling is successful, the UE can obtain the RNTI used to scramble the DCI, thereby determining whether the DCI is common or UE-specific.

[0205] The embodiments of the present application do not limit the execution order of the above operations. For example, operations 201 and 202 may be executed in the same time unit. For example, operations 203-206 may be executed in the same time unit; or operations 203 and 204 may be executed in one time unit, and operations 205 and 206 may be executed in another time unit.

[0206] Figure 1 The method shown can be any of the following cases 1 to 4.

[0207] Case 1: The first DCI can only be used to schedule PDSCH.

[0208] Case 2: The first DCI can only be used to schedule PUSCH.

[0209] Case 3: The first DCI is used to schedule PDSCH or PUSCH. The first DCI can be used to schedule both PDSCH and PUSCH, but one first DCI cannot be used to schedule both PDSCH and PUSCH at the same time.

[0210] In this case, the first DCI can also be used to indicate whether the first DCI is used to schedule PDSCH or PUSCH. This method further reduces the types of first DCI sizes that the UE needs to detect. That is, the sizes of the DCI formats used to schedule PDSCH and PUSCH are the same, thereby reducing the number of DCI detection times for the UE.

[0211] Exemplarily, the first DCI may include an identification field of the DCI format, which is used to indicate whether the first DCI is used to schedule PDSCH or PUSCH. For example, the first DCI includes a 1-bit indication field. When the value of the indication field is a first value, the first DCI is used to schedule PUSCH. When the indication field is a second value, the first DCI is used to schedule PDSCH. The first value and the second value may be 1 and 0, respectively, or may be 0 and 1, respectively, and the embodiments of the present application do not impose any restrictions. After receiving a first DCI, the UE determines whether the first DCI is used to schedule PDSCH or PUSCH based on the value of the 1-bit indication field, so that the first DCI can be interpreted according to the corresponding DCI format.

[0212] As another example, when the first DCI is scrambled by the first RNTI, the first DCI is used to schedule the PUSCH; when the first DCI is scrambled by the second RNTI, the first DCI is used to schedule the PDSCH. When the UE receives the first DCI, if the UE successfully descrambles the first DCI using the first RNTI, the UE believes that the first DCI is used to schedule the PUSCH, and can interpret the first DCI according to the DCI format of the PUSCH and send the PUSCH to the base station using the transmission parameters indicated by the first DCI; if the UE successfully descrambles the first DCI using the second RNTI, the UE believes that the first DCI is used to schedule the PDSCH, and can interpret the first DCI according to the DCI format of the PDSCH and receive the PDSCH from the base station using the information indicated by the first DCI.

[0213] In an embodiment of the present application, the types of information fields included in the DCI format for scheduling PDSCH and the DCI format for scheduling PUSCH may be all the same, or may be all different, or may be partially the same and partially different, and this embodiment of the present application does not impose any restrictions. If the two DCI formats include the same type of information fields, for example, both include frequency domain resource allocation fields, the length (such as the number of bits) of the frequency domain resource allocation field in the DCI for scheduling PDSCH and the length of the frequency domain resource allocation field in the DCI for scheduling PUSCH may be the same or different, and this embodiment of the present application does not impose any restrictions.

[0214] Case 4: The first DCI is used to schedule PDSCH and / or PUSCH. The first DCI can be used to schedule both PDSCH and PUSCH. A first DCI can be used to schedule only PDSCH, only PUSCH, or both PDSCH and PUSCH.

[0215] In this case, the first DCI can also be used to indicate whether the first DCI is used to schedule PDSCH, PUSCH, or both PDSCH and PUSCH. This method further reduces the types of first DCI sizes that the UE needs to detect. That is, the sizes of the three DCI formats—DCI for scheduling PDSCH, DCI for scheduling PUSCH, and DCI for both PDSCH and PUSCH—are the same, thereby reducing the number of DCI detections required by the UE.

[0216] When the first DCI is used to schedule the PUSCH, the first DCI includes the transmission parameters of the PUSCH but does not include the transmission parameters of the PDSCH. When the first DCI is used to schedule the PDSCH, the first DCI includes the transmission parameters of the PDSCH but does not include the transmission parameters of the PUSCH. When the first DCI is used to schedule both the PDSCH and the PUSCH, the first DCI includes the transmission parameters of both the PDSCH and the PUSCH.

[0217] Exemplarily, the first DCI may include an identification field of the DCI format, used to indicate whether the first DCI is used to schedule PDSCH, PUSCH, or PDSCH and PUSCH. For example, the first DCI includes a 2-bit indication field. When the value of the indication field is a first value, the first DCI is used to schedule PUSCH. When the indication field is a second value, the first DCI is used to schedule PDSCH. When the indication field is a third value, the first DCI is used to schedule PDSCH and PUSCH. Exemplarily, Tables 2a-2c give exemplary correspondences between the values of the 2-bit indication field in the first DCI and the information scheduled by the first DCI. Other possible correspondences are not listed one by one.

[0218] Table 2a

[0219]

[0220] Table 2b

[0221]

[0222] Table 2c

[0223]

[0224] As another example, when the first DCI is scrambled by the first RNTI, the first DCI is used to schedule PUSCH; when the first DCI is scrambled by the second RNTI, the first DCI is used to schedule PDSCH; when the first DCI is scrambled by the third RNTI, the first DCI is used to schedule PDSCH and PUSCH. When the UE receives the first DCI, if the UE successfully descrambles the first DCI using the first RNTI, the UE believes that the first DCI is used to schedule PUSCH, so that the first DCI can be interpreted according to the DCI format of PUSCH, and the PUSCH can be sent to the base station using the transmission parameters indicated by the first DCI; if the UE successfully descrambles the first DCI using the second RNTI, the UE believes that the first DCI is used to schedule PDSCH, so that the first DCI can be interpreted according to the DCI format of PDSCH, and the PDSCH can be received from the base station using the transmission parameters indicated by the first DCI; if the UE successfully descrambles the first DCI using the third RNTI, the UE believes that the first DCI is used to schedule PDSCH and PUSCH, so that the first DCI can be interpreted according to the corresponding DCI format, and the PUSCH can be sent to the base station using the transmission parameters of PUSCH indicated by the first DCI, and the PDSCH can be received from the base station using the transmission parameters of PDSCH indicated by the first DCI.

[0225] In one possible implementation, the first search space is the first specific search space of the UE. The first specific search space of the UE is included in multiple specific search spaces of the UE, such as 2, 3, 4 or more. Any specific search space in the multiple specific search spaces can correspond to N1 DCI formats. Among them, N1 is a positive integer greater than or equal to 1, wherein the N1 values corresponding to any two different specific search spaces may be the same or different; if the N1 values corresponding to the two different specific search spaces are the same, the specific formats of the DCI they correspond to may be the same or different, and the embodiments of the present application do not impose any restrictions. The multiple specific search spaces correspond to a total of N2 DCI formats, and the DCI of the N2 DCI formats has the same DCI size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1.

[0226] In the embodiment of the present application, for any specific search space, if the specific search space corresponds to N1 DCI formats, and N1 is greater than 1, and the DCI sizes corresponding to the N1 DCI formats are the same, then for the N1 DCI formats, the DCIs of different formats can be distinguished by the indicator field in the DCI and / or the RNTI used to scramble the DCI. For example, if the specific search space corresponds to DCI format A and DCI format B, DCI A and DCI B can be distinguished by any of the following methods:

[0227] Mode A: DCI A and DCI B include a DCI format identification field, which is used to indicate whether the format of the DCI is DCI A or DCI B. For example, the UE receives a DCI that includes a 1-bit indication field. When the value of the indication field is a first value, the format of the DCI is DCI A. When the indication field is a second value, the format of the DCI is DCI B. The first value and the second value may be 1 and 0, respectively, or may be 0 and 1, respectively, and this embodiment of the present application does not limit this.

[0228] Mode B: DCI A and DCI B are scrambled by an RNTI, which indicates whether the DCI format is DCI A or DCIB. For example, if a UE receives a DCI and successfully descrambles it using RNTI A, it considers the DCI format to be DCIA. If it successfully descrambles it using RNTI B, it considers the DCI format to be DCI B.

[0229] Mode C: DCI A and DCI B include a DCI format identification field, and DCI A and DCI B are scrambled by RNTI. The identification field and the RNTI together indicate whether the format of the DCI is DCI A or DCI B. For example, a UE receives a DCI including a 1-bit indication field. If the DCI is successfully descrambled using RNTI A and the value of the indication field is a first value, the format of the DCI is considered to be DCI A. If the DCI is successfully descrambled using RNTI B and the value of the indication field is a second value, the format of the DCI is considered to be DCI B.

[0230] Optionally, the method can be combined with Figure 1 The method shown is used in combination. At this time, the size of the DCI transmitted in the multiple specific search spaces and the size of the second DCI. That is, the multiple specific search spaces and the first common search space are configured to correspond to the same DCI size.

[0231] Alternatively, the method may not rely on Figure 1 The method shown is used. This method does not depend on Figure 1 When the method shown is used, please refer to the above text for the introduction of the first specific search space and the first DCI transmitted in the first specific search space, which will not be repeated here. Figure 1 When the method shown is used, the DCI transmitted in the multiple specific search spaces can be Figure 1The second DCI size in the method shown may be aligned with another size. The other size may be a predefined value or a DCI size corresponding to one of the N2 DCI formats. For example, the DCI size may be the smallest DCI size among the DCI sizes corresponding to the N2 DCI formats, or the largest DCI size among the DCI sizes corresponding to the N2 DCI formats.

[0232] Optionally, the multiple specific search spaces may be part of the specific search spaces configured for the UE, or may be all of the specific search spaces configured for the UE, which is not limited in the embodiments of the present application. For example, the multiple specific search spaces are all of the specific search spaces configured for the UE in one BWP of the UE.

[0233] Exemplarily, the UE has three specific search spaces, namely specific search space A, specific search space B, and specific search space C. The DCI formats corresponding to each search space are shown in Table 3. Exemplarily, the DCI transmitted in the specific search space A can be regarded as the first DCI, the first format is the format when the first DCI schedules PDSCH, the second format is the format when the first DCI schedules PUSCH, and the specific search space A can be regarded as the first specific search space. The three specific search spaces in Table 3 correspond to a total of four DCI formats, namely the first format, the second format, the third format and the fourth format. When multiple DCIs corresponding to these four formats are transmitted in the corresponding specific search spaces, the sizes of the multiple DCIs are aligned, that is, the sizes of the multiple DCIs are the same.

[0234] Table 3

[0235]

[0236] In this method, the sizes of DCI transmitted by multiple specific search spaces of the UE are the same, that is, the multiple specific search spaces are configured to correspond to one DCI size. When the multiple specific search spaces of the UE have overlapping parts, the number of times the UE blindly detects PDCCH can be reduced.

[0237] In the embodiments of the present application, illustratively, when a base station transmits DCI to a UE, it may perform at least one of the following operations 1 to 6 on the DCI. Accordingly, when the UE receives the DCI, it may perform corresponding reverse operations, such as depadding, adding truncated information bits, descrambling, channel decoding, and / or demodulation, which will not be further described here.

[0238] Optionally, operation 1: obtain the DCI according to a format corresponding to the DCI, wherein the information bits in the DCI may be referred to as an original bit stream of the DCI.

[0239] Optionally, operation 2: truncating or padding the input bit stream to obtain a truncated or padded bit stream, wherein the input bit stream may be an original bit stream.

[0240] In the embodiment of the present application, there is no limitation on the type and number of the truncated information fields. For example, the truncated information fields may be one or more of the following information fields: frequency domain resource allocation field, time domain resource allocation field, MCS, and other possible information fields.

[0241] Optionally, operation 3: adding cyclic redundancy check (CRC) check bits to the input bit stream to obtain a CRC bit stream. The CRC check bits can be used by the UE for error detection. The input bit stream of operation 3 can be an original bit stream, or a truncated or padded bit stream.

[0242] Optionally, operation 4: channel coding is performed on the input bit stream to obtain a channel coded bit stream. The channel coding method may be low density parity check codes (LDPC), polar codes, or Turbo codes. The coding code rate may be a real number greater than 0, such as 1 / 2, 1 / 3, 2 / 3, etc. Optionally, the channel coding operation may also include a rate matching operation. The rate matching operation may be understood as the UE performing a rate matching operation on the output bit stream after channel coding according to the number of resources corresponding to the data transmission and the modulation order of the data transmission, to obtain an output bit stream that matches the data transmission resources and the modulation order. The input bit stream of operation 4 may be an original bit stream, a truncated or padded bit stream, or a CRC bit stream.

[0243] Optionally, in operation 5, the input bit stream is scrambled based on a scrambling sequence to obtain a scrambled bit stream. The scrambling operation can reduce inter-cell interference. The input bit stream in operation 5 can be an original bit stream, a truncated or padded bit stream, a CRC bit stream, or a channel-coded bit stream.

[0244] Optionally, in operation 6, the input bit stream is modulated to obtain modulation symbols. The modulation method may be QAM modulation, and the modulation order may be 16QAM, 64QAM, or 128QAM, etc., which is not limited in the embodiment of the present application. The input bit stream of operation 6 may be an original bit stream, a truncated or padded bit stream, a CRC bit stream, a channel coded bit stream, or a scrambled bit stream.

[0245] In the embodiment of the present application, a DCI A (e.g., a first DCI) and another DCI B (e.g., a second DCI) are of the same size or aligned, including any of the following situations. For example, DCI A is the first DCI and DCI B is the second DCI; or, DCI A is the second DCI and DCI B is the first DCI; or, DCI A is a DCI in the first specific search space and DCI B is a DCI in the second specific search space, which is not limited in the embodiment of the present application.

[0246] (1) DCI A is obtained according to the DCI format corresponding to DCI A, and DCI B is obtained according to the DCI format corresponding to DCI B. The number of bits included in DCI A is the same as the number of bits included in DCI B. That is, the number of bits in the original bit stream of DCI A is the same as the number of bits in the original bit stream of DCI B. In this embodiment of the present application, the original bit stream of DCI may also be referred to as the information bit stream of DCI.

[0247] (2) DCI A is obtained according to the DCI format corresponding to DCI A, DCI A is padded or truncated, and DCI B is obtained according to the DCI format corresponding to DCI B. The number of bits included in the padded or truncated DCI A is the same as the number of bits included in DCI B. That is, the number of bits in the truncated or padded bit stream of DCI A is the same as the number of bits in the original bit stream of DCI B.

[0248] In one possible implementation, if DCI A and DCI B can be aligned by truncating or padding the bit stream, then if it is determined that the number of bits of the original bit stream of DCI A and the original bit stream of DCI B are the same, there is no need to truncate or pad the bit stream of DCI A or DCI B.

[0249] (3) DCI A is obtained according to the DCI format corresponding to DCI A, and DCI B is obtained according to the DCI format corresponding to DCI B. DCI B is padded or truncated, and the number of bits included in DCI A is the same as the number of bits included in the padded or truncated DCI B. That is, the number of bits in the original bit stream of DCI A is the same as the number of bits in the truncated or padded bit stream of DCI B.

[0250] (4) DCI A is obtained according to the DCI format corresponding to DCI A, and DCI B is obtained according to the DCI format corresponding to DCI B. A first operation is performed on DCI A to obtain a first bit stream. A first operation is performed on DCI B to obtain a second bit stream. The first bit stream and the second bit stream have the same number of bits. The first operation may include: adding a CRC; adding a CRC and channel coding; adding a CRC and scrambling; or adding a CRC, channel coding, and scrambling. Optionally, for DCI A, DCI B, or for DCI A and DCI B, the first operation may also include truncation or padding.

[0251] (5) DCI A is obtained according to the DCI format corresponding to DCI A, and DCI B is obtained according to the DCI format corresponding to DCI B. A second operation is performed on DCI A to obtain a first group of modulation symbols. A second operation is performed on DCI B to obtain a second group of modulation symbols. The first group of modulation symbols and the second group of modulation symbols have the same number of symbols. The second operation may include: modulation; adding CRC and modulation; channel coding and modulation; scrambling and modulation; adding CRC, channel coding and modulation; adding CRC, scrambling and modulation; or adding CRC, channel coding, scrambling and modulation. Optionally, for DCI A, DCI B, or for DCI A and DCI B, the second operation may also include truncation or padding.

[0252] In the embodiments of the present application, as described above, in order to make the different DCIs sent by the base station to the UE the same size, the base station may pad or truncate one or more of the DCIs so that the different DCIs are aligned to the same size when transmitted. The different DCIs may be the first DCI and the second DCI, or may be DCIs transmitted in different specific search spaces of the UE. To simplify the description, the first DCI and the second DCI are used as examples for description.

[0253] Exemplarily, the base station may pad or truncate the original bit stream of the first DCI so that its size is aligned with the size of the second DCI. Similarly, optionally, the base station may pad or truncate the original bit stream of the second DCI so that its size is aligned with the size of the first DCI. To simplify the description, the alignment of the first DCI to the second DCI is described here as an example.

[0254] In one possible implementation, the first DCI includes padding bits. The padding bits include at least one bit. The value of the at least one bit is preconfigured and known to both the base station and the UE. For example, the value of each of the at least one bit is 0. For another example, the value of each of the at least one bit is 1. Optionally, the position of the padding bits in the first DCI or a predefined padding rule can be predefined. For example, the padding bits can be added before the most significant bit information or after the least significant bit information of the first DCI. This rule is known in advance by the base station and the UE.

[0255] Exemplarily, after the base station determines the first DCI based on the DCI format corresponding to the first DCI, if the size of the first DCI is smaller than the size of the second DCI, the base station pads the first DCI. Assuming that the value of the padded bits is zero, it is considered that the base station has performed a zero-padded operation on the first DCI, and the size of the first DCI after zero-padded is equal to the size of the second DCI. The base station sends the zero-padded first DCI to the UE.

[0256] The UE can obtain the size of the first DCI before zero padding according to the DCI format corresponding to the first DCI, and can obtain the size of the second DCI according to the format corresponding to the second DCI, so that the UE can determine the number of bits of the zero-padded information bits in the first DCI. After receiving the first DCI from the base station, the UE removes the zero-padded information bits from the first DCI or ignores the zero-padded information bits in the first DCI, so that the UE can determine the content of the first DCI based on the non-zero-padded information bits in the first DCI. For example, when the first DCI is used to schedule PDSCH, the UE can receive PDSCH from the base station based on the determined content of the first DCI. For another example, if the first DCI is used to schedule PUSCH, the UE can send PUSCH to the base station based on the determined content of the first DCI.

[0257] In one possible implementation, the first DCI includes a truncated information field. The truncated information field includes one or more information fields, and one or more bits may be truncated in each information field. The number of bits truncated in different types of information fields may be the same or different. Which (or which) information fields in the first DCI are truncated is predefined, and the rules for performing truncation operations in the information fields are predetermined, that is, the base station and the UE know in advance which (or which) information fields in the first DCI are truncated and which (or which bits) in the information fields will be truncated. In an embodiment of the present application, truncating bits in the information field of the DCI or performing a truncation operation on the DCI can be described as: perforating the DCI or the information field in the DCI.

[0258] Exemplarily, after the base station determines the first DCI according to the DCI format corresponding to the first DCI, if the size of the first DCI is larger than the size of the second DCI, the base station truncates the first DCI. For example, the first DCI includes a frequency domain resource allocation domain, and the base station truncates the high-order information bits in the domain so that the frequency domain resource allocation domain of the first DCI does not include these high-order information bits, but only includes low-order information bits other than these high-order information bits. For another example, the first DCI includes information fields of two transmission blocks, and the base station truncates the information fields of one of the transmission blocks so that the first DCI only includes the information field of the other transmission block. The size of the truncated first DCI is equal to the size of the second DCI. After the UE receives the truncated first DCI, if the UE needs to interpret the truncated information field, the UE can fill the high-order bits of the information field with zeros and interpret the information field after filling with zeros. For example, if the 2 high-order information bits of the frequency domain resource allocation field of the first DCI are truncated, the UE supplements the high-order bits of the frequency domain resource allocation field of the received first DCI by 2 bits, and the values of these 2 bits are 00. The UE interprets the frequency domain resource allocation field after the zero supplement.

[0259] Optionally, for truncated information fields, for example, the information fields of two transport blocks are truncated with the information field of one transport block, the base station can multiplex other information fields to indicate the truncated information fields. For example, it can be predefined that the information field of the second transport block is truncated, and the information field of the first transport block is multiplexed to indicate the first and second transport blocks. Then the UE can determine the transmission information corresponding to the second transport block based on the information field of the first transport block included in the first DCI. For example, the UE can determine that the transmission information of the second transport block is the same as the transmission information of the first transport block, or the UE can determine the transmission information corresponding to the second transport block based on the offset information between the transmission information of the first transport block and the second transport block. The offset information can be predefined or notified to the UE by the base station through signaling. For example, if the information field of the first transport block indicates MCS1 and RV 1, then after receiving the first DCI, the UE determines that the MCS of the first transport block and the second transport block are both MCS1, and determines that the RV of the first transport block and the second transport block are both RV 1.

[0260] In the method provided in an embodiment of the present application, the first DCI may be used to indicate the UE's activated BWP, which is used to transmit a physical data channel between the UE and the base station. The first DCI may also include a frequency domain resource allocation field, which indicates the frequency domain resources allocated for the physical data channel in the activated BWP. The physical data channel carries UE-specific information.

[0261] In one possible implementation, the size of the frequency domain resource allocation field in the first DCI may be determined based on the bandwidth of the initial BWP or the bandwidth of the control resource set (CORESET) 0. Optionally, in an embodiment of the present application, a REDCAP terminal and a high-capability terminal may share the initial BWP and CORESET 0, or may configure independent initial BWPs and CORESET 0 for each of the two terminals. In the frequency domain resource allocation method, if a REDCAP terminal implements the method, the initial BWP and CORESET 0 in the frequency domain resource allocation method may be the initial BWP and CORESET 0 configured for the REDCAP terminal, or the initial BWP and CORESET 0 configured for the high-capability terminal.

[0262] In an embodiment of the present application, the base station may send an SSB to the UE in the initial BWP. The SSB may carry a master information block (MIB). The MIB may be used to indicate the resource location of the initial BWP. After the UE searches for the SSB, it may obtain the specific resource location of the initial BWP based on the configuration of the MIB in the SSB. In the initial BWP, the base station may also send one or more of the following public information to the UE through the PDSCH: system information block (SIB) 1, on-demand system information (OSI), and paging message. In an embodiment of the present application, the SSB is cell-level public information, and the SSB may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel. The MIB is carried on the PBCH. The SSB used to indicate the configuration information of the initial BWP may also be referred to as a cell-defined SSB.

[0263] In an embodiment of the present application, the configuration information of CORESET 0 may be pre-configured, or indicated by the base station to the UE through signaling. The signaling may be the MIB or the common configuration message PDCCH-ConfigCommon of the PDCCH. For example, the MIB may indicate one or more of the following parameters of CORESET 0: the frequency domain resource position in the carrier, the number of symbols occupied in the time domain, and the multiplexing method between CORESET 0 and the SSB. As mentioned above, CORESET 0 may be associated with a search space, and the UE may detect the corresponding DCI in the resources corresponding to CORESET 0 according to the configuration of the search space. The search space associated with CORESET 0 is a common search space. The common search space may transmit DCI scrambled by a common RNTI (e.g., SI-RNTI). Optionally, the common search space may also transmit DCI scrambled by a UE-specific RNTI.

[0264] To simplify the description, the following description is taken as an example in which the size of the frequency domain resource allocation domain in the first DCI is determined according to the bandwidth of the initial BWP of the UE. When the size of the frequency domain resource allocation domain is determined according to the bandwidth of CORESET 0, the initial BWP in the following method is replaced with COREST 0, and the bandwidth of the initial BWP is replaced with the bandwidth of CORESET 0.

[0265] The frequency domain resource allocation field in the first DCI may indicate the frequency domain resources allocated for the UE's PDSCH or PUSCH in the UE's active BWP in the following ways. If the frequency domain resources for the UE's PDSCH are indicated, the UE may receive the PDSCH from the base station in the frequency domain resources. If the frequency domain resources for the UE's PUSCH are indicated, the UE may send the PUSCH to the base station in the frequency domain resources.

[0266] The first method (method 0).

[0267] The frequency domain resource allocation field in the first DCI includes N RBG bits. RBG bits and activate N in BWP RBG RBGs correspond one to one. RBG One of the bits, when the value of the bit is the first value (such as 1), the resources allocated to the UE include the RBG corresponding to the bit; when the value of the bit is the second value (such as 0) or is not the first value, the resources allocated to the UE do not include the RBG corresponding to the bit. RBG Less than or equal to the number of RBGs included in the initial BWP.

[0268] In an embodiment of the present application, an RBG includes a positive integer number of RBs, and the number of RBs included can be referred to as the size of the RBG. An RB includes a positive integer number of subcarriers. Exemplarily, each RB is predefined to include 6 or 12 subcarriers. The size of an RBG can be predefined, for example, an RBG is predefined to include 2, 4, 6, 8 or 16 RBs. Alternatively, the size of an RBG can be determined according to the bandwidth of a certain bandwidth (denoted as bandwidth X). Exemplarily, Table 4 shows the correspondence between the bandwidth of bandwidth X and the size of the RBG (configuration 1 or configuration 2), where bandwidth X is the bandwidth of the BWP. When configuration 1 and configuration 2 are both supported in the system, the base station can instruct the UE to use one of configuration 1 and configuration 2 through signaling.

[0269] Table 4

[0270]

[0271] For example, in the method of the above-mentioned mode 0, the number of RBGs included in the initial BWP is based on the bandwidth of the initial BWP and the RBG size of the initial BWP. The bandwidth of the initial BWP is the number of RBs included in the initial BWP. and is a positive integer. The RBG size of the initial BWP can be predefined; or, it can be determined according to the bandwidth of the initial BWP, for example, replacing the bandwidth X in Table 4 with the initial BWP and replacing the bandwidth X in Table 4 with the initial BWP. Replace with You can get the size of the RBG of the initial BWP

[0272] The initial BWP includes RBG. Example 1: equal when Can be When divisible, each RBG has the same size, which is Example 2, regardless of Can it be divisible, equal in Indicates the RB index corresponding to the starting RB of the initial BWP. In this case, the size of the first RBG included in the initial BWP is if Then the size of the last RBG in the initial BWP is Otherwise, the size of the last RBG is The sizes of other RBGs included in the initial BWP are In the resource allocation method of the embodiment of the present application, unless otherwise specified, the same variables have the same meanings, and the meanings of the variables already described will not be repeated below.

[0273] In one possible implementation, when the bandwidth of the activated BWP indicated by the first DCI is greater than or equal to the bandwidth of the initial BWP, N in the method of the above-mentioned method 0 is RBG Equal to the number of RBGs included in the initial BWP Optionally, the size of an RBG in the activated BWP is predefined or determined based on the bandwidth of the activated BWP. For example, the bandwidth of the activated BWP and the size of the RBGs in the activated BWP are shown in Table 4. Similarly to the method for determining the RBG size and number of RBGs in the initial BWP based on Table 4, the RBG size of the activated BWP can be obtained.

[0274] Optionally, when the bandwidth of the activated BWP indicated by the first DCI is equal to the bandwidth of the initial BWP, the first DCI can indicate a maximum of N in the activated BWP. RBG RBG, indicating that the N RBG Which RBGs in the N RBGs are allocated to the UE. RBG RBGs are all RBGs in the activated BWP.

[0275] Optionally, when the bandwidth of the activated BWP indicated by the first DCI is greater than the bandwidth of the initial BWP, the first DCI can indicate a maximum of N in the activated BWP. RBG RBG, indicating that the N RBG Which RBGs in the N RBGs are allocated to the UE. RBG RBGs are part of the RBGs in the activated BWP.

[0276] Optionally, when the bandwidth of the activated BWP indicated by the first DCI is greater than the bandwidth of the initial BWP, some or all of the bits in the other information fields in the first DCI may be multiplexed to indicate whether more RBGs in the activated BWP are allocated to the UE. The information fields that may be multiplexed may be, for example, one or more of the following information fields: DAI field, PUCCH resource indication field, MCS field, time domain resource allocation field, and frequency domain resource allocation field. For example, the number of multiplexed bits is At this time, the N of the frequency domain resource allocation domain RBG bits and the bits together bits, the bits and activates the BWP RBGs correspond one to one. One of the bits in the BWP is assigned to the UE. When the bit value is a first value (e.g., 1), the resources allocated to the UE include the RBG corresponding to the bit. When the bit value is a second value (e.g., 0) or is not the first value, the resources allocated to the UE do not include the RBG corresponding to the bit. Through this method, the base station can indicate which RBGs in some or all of the RBGs in the activated BWP are assigned to the UE.

[0277] In one possible implementation, the bandwidth of the activated BWP indicated by the first DCI is smaller than the bandwidth of the initial BWP, and the N in the method of the above-mentioned method 0 is RBG Less than or equal to the number of RBGs included in the initial BWP At this time, the activation BWP includes N RBG RBG. The RBG size of the activated BWP is based on the number of RBs included in the activated BWP. and N RBG Certain. Among them, is a positive integer. For example, when Can be N RBG When divisible, each RBG of the activated BWP has the same size, which is when Cannot be N RBG When divided evenly, the size of the first RBG or the last RBG included in the activated BWP is The sizes of the remaining RBGs are In this method, by changing the RBG size of the activated BWP, the base station can indicate which RBGs of all RBGs in the activated BWP are allocated to the UE.

[0278] In one possible implementation, the bandwidth of the activated BWP indicated by the first DCI is greater than the bandwidth of the initial BWP, and N in the method of the above-mentioned method 0 is RBG Equal to the number of RBGs included in the initial BWP At this time, the activation BWP includes N RBG RBG. The RBG size of the activated BWP is based on the bandwidth of the activated BWP, that is, the number of RBs included in the activated BWP. and N RBG For example, when Can be N RBG When divisible, the RBG size of the activated BWP can be expressed as When N RB Cannot be N RBG When divided evenly, the size of the first RBG or the last RBG included in the activated BWP is The sizes of the remaining RBGs are In this method, the base station may indicate which RBGs among all RBGs in the activated BWP are allocated to the UE.

[0279] The second method: Method 1.

[0280] Exemplarily, the frequency domain resource allocation field in the first DCI includes bits. Among them, Indicates the number of RBs included in the initial BWP.

[0281] In one possible implementation, the bandwidth of the activated BWP indicated by the first DCI is greater than the bandwidth of the initial BWP, and is added. The value of the frequency domain resource allocation field after the bits is the resource indication value (RIV), which is used to indicate the starting RB and the number of consecutively allocated RBs allocated for the UE's PDSCH or PUSCH in the activated BWP. Indicates the number of RBs included in the activated BWP. The added bits can be all 0, all 1, or other pre-configured values. Optionally, the base station sends a first DCI to the UE, and the frequency domain resource allocation field of the first DCI includes After receiving the first DCI, the UE can add the high or low bit of the frequency domain resource allocation field of the first DCI. bits, the bits after the addition The value of the bits is regarded as RIV, and the starting RB and the number of consecutively allocated RBs allocated for the PDSCH or PUSCH of the UE in the activated BWP are determined according to the RIV.

[0282] In one possible implementation, the bandwidth of the activated BWP indicated by the first DCI is smaller than the bandwidth of the initial BWP. The value of the bits is RIV, which is used to indicate the starting RB and the number of consecutive RBs allocated for the UE's PDSCH or PUSCH in the activated BWP. is the number of RBs included in the activated BWP. These redundant bits may be located in the most significant bit of the frequency domain resource allocation field and filled with 0 or 1. When the UE determines the allocated resources based on the received frequency domain resource allocation field, it may ignore these reserved bits, for example, truncate or discard them.

[0283] In one possible implementation, the bandwidth of the activated BWP indicated by the first DCI is greater than or less than the bandwidth of the initial BWP. After receiving the DCI, the UE can determine the resources allocated to the UE's PDSCH or PUSCH in the activated BWP based on the scaling factor and the frequency resources indicated by the RIV. The value indicated by the bits. The scaling factor can be expressed as Based on the RIV, the UE determines the starting RB position for allocation. This starting RB position is the starting RB position for the UE's PDSCH or PUSCH in the active BWP. The UE multiplies the number of RBs indicated by the RIV by the scaling factor to determine the number of RBs allocated for the UE's PDSCH or PUSCH in the active BWP. If this product is not an integer, it may be rounded up or down.

[0284] The third method: Method 0 or Method 1.

[0285] Exemplarily, the frequency domain resource allocation field in the first DCI includes Among them, the highest or lowest bit in the frequency domain resource allocation field is used to indicate whether the resource allocation mode is mode 0 or mode 1. When the resource allocation mode is mode 0, the N bits in the resource allocation field are RBG bits are used to indicate the resources allocated for the PDSCH or PUSCH of the UE in the activated BWP indicated by the first DCI according to the above method 0; when the resource allocation method is method 1, the bits in the resource allocation field are used to indicate the resources allocated for the PDSCH or PUSCH of the UE in the activated BWP indicated by the first DCI ... bits are used to indicate, according to the above-mentioned method 1, the resources allocated for the PDSCH or PUSCH of the UE in the activated BWP indicated by the first DCI.

[0286] Optionally, in the frequency domain resource allocation field of the first DCI, the number of bits used to indicate the allocated resources is predefined. For example, the predefined number of bits is determined based on the minimum bandwidth, maximum bandwidth, or a specific bandwidth of CORESET 0 supported by the system. For example, the number of bits used to indicate the allocated resources in the predefined first DCI is determined based on the minimum bandwidth of CORESET 0, and the bandwidths of CORESET 0 supported by the system are 5 MHz, 10 MHz, and 20 MHz, respectively. If the size of the frequency domain resource allocation field is calculated using the above-mentioned method 1, the sizes of the frequency domain resource allocation fields corresponding to these three bandwidths are 9 bits, 11 bits, and 13 bits, respectively, and the number of bits used to indicate the allocated resources in the first DCI can be 9 bits in total. In this way, when the actual bandwidth of CORESET 0 is 10MHz or 20MHz, the size of the frequency domain resource allocation field in the first DCI can be 11 bits or 13 bits according to the bandwidth of CORESET 0, and only 9 bits of these 11 bits or 13 bits are used to indicate resource allocation. Then, the resource allocation field in the first DCI can be redundant with 2 (11-9) bits or 4 (13-9) bits. Optionally, the redundant bits can be regarded as reserved bits, and the 9 bits can be regarded as bits of the frequency domain resource allocation field. The redundant 2 bits or 4 bits can implement more data transmission functions, such as for PUCCH resource indication, and for example, for hybrid automatic repeat request (HARQ) timing indication. For example, the following Table 5 shows the length of the information field in the first DCI (the number of bits included) when the bandwidth of CORESET 0 is 24RB, 48RB and 96RB respectively.

[0287] Table 5

[0288]

[0289] In this way, since the number of bits used to indicate the allocated resources is always 9 bits, when this number of bits does not match the number of bits required for resource allocation in the activated BWP, the method of using the 9 bits to allocate resources in the activated BWP is similar to any of the above three methods, and the initial BWP is replaced with COREST 0, and the bandwidth of CORESET 0 is 24RB.

[0290] In an embodiment of the present application, when the terminal device is a REDCAP terminal, the initial BWP bandwidth of the terminal device may be the same as or different from the initial BWP of a non-REDCAP terminal. The initial CORESET 0 of the terminal device may be the same as or different from the initial CORESET 0 of a non-REDCAP terminal.

[0291] Through the above method, the size of the frequency domain resource allocation field of the first DCI and the size of the frequency domain resource allocation field of the second DCI can be aligned. In the method provided in the embodiment of the present application, if the base station sends a second DCI to the UE, the second DCI can schedule a physical data channel carrying public information, such as PDSCH. The PDSCH is transmitted in the initial BWP or CORESET 0. The frequency domain resource allocation field in the second DCI can indicate the frequency domain resources allocated to the PDSCH in the initial BWP or CORESET 0. Among them, the resource allocation method can be similar to method 0 or method 1, and the size of the frequency domain resource allocation field is determined according to the bandwidth of the initial BWP or CORESET 0, indicating the resources allocated to the PDSCH in the initial BWP or CORESET 0.

[0292] For example, taking the allocation of resources in the initial BWP as an example, for the second DCI, when using mode 0 to allocate frequency domain resources for the physical data channel, the frequency domain resource allocation field in the first DCI includes bits. bits and the initial BWP RBGs correspond one to one. One of the bits, when the value of the bit is a first value (such as 1), the resources allocated to the physical data channel include the RBG corresponding to the bit; when the value of the bit is a second value (such as 0) or is not the first value, the resources allocated to the physical data channel do not include the RBG corresponding to the bit. For example, taking the allocation of resources in the initial BWP as an example, for the second DCI, when using mode 1 to allocate frequency domain resources for the physical data channel, the frequency domain resource allocation field in the second DCI includes bits. The value of bits is RIV, which is used to indicate the starting RB and the number of consecutive RBs allocated for the physical data channel in the initial BWP. Indicates the number of RBs included in the initial BWP.

[0293] For example, taking the allocation of resources in the initial BWP as an example, for the second DCI, when using mode 0 or mode 1 to allocate frequency domain resources for the physical data channel, the frequency domain resource allocation field in the second DCI includes bits. Among them, the highest or lowest bit in the frequency domain resource allocation field is used to indicate whether the resource allocation mode is mode 0 or mode 1. When the resource allocation mode is mode 0, the bits in the resource allocation field are bits are used to indicate the resources allocated for the physical data channel in the initial BWP according to the above-mentioned mode 0; when the resource allocation mode is mode 1, the resource allocation field bits are used to indicate the resources allocated for the physical data channel in the initial BWP according to the above-mentioned method 1. Therefore, in the above-mentioned method, by determining the size of the frequency domain resource allocation field of the first DCI according to the initial BWP or the bandwidth of CORESET 0, the size of the frequency domain resource allocation field of the first DCI can be aligned with the size of the frequency domain resource allocation field of the second DCI.

[0294] In the embodiments provided in the present application, the methods provided in the embodiments of the present application are introduced from the perspectives of network equipment (e.g., base station), terminal equipment (e.g., UE), and the interaction between network equipment and terminal equipment. In order to implement the functions in the methods provided in the embodiments of the present application, the network equipment and the terminal may include hardware structures and / or software modules to implement the above functions in the form of hardware structures, software modules, or hardware structures plus software modules. Whether a function in the above functions is performed in the form of hardware structures, software modules, or hardware structures plus software modules depends on the specific application and design constraints of the technical solution.

[0295] Figure 3 Shown is a structural example diagram of the device 300 provided in an embodiment of the present application.

[0296] In one possible implementation, apparatus 300 is used to implement the functions of the terminal device in the above method. The apparatus may be a terminal device or another device capable of implementing the functions of the terminal device. The other device may be installed in the terminal device or used in conjunction with the terminal device.

[0297] The apparatus 300 includes a receiving module 301 for receiving a signal or information, for example, for receiving one or more of the following signals from a network device: a first DCI, a second DCI, and a PDSCH.

[0298] The apparatus 300 includes a sending module 302, which is used to send a signal or information, for example, to send a PUSCH to a network device.

[0299] The apparatus 300 includes a processing module 303 for processing received signals or information, for example, for decoding signals or information received by the receiving module 301. The processing module 303 may also generate signals or information to be transmitted, for example, for generating signals or information to be transmitted by the transmitting module 302.

[0300] The division of modules in the embodiments of the present application is schematic and is a logical functional division. In actual implementation, other division methods may be used. For example, the receiving module 301 and the sending module 302 may also be integrated into a transceiver module or a communication module. In addition, the functional modules in the various embodiments of the present application may be integrated into a single module, or may exist physically separately, or two or more modules may be integrated into a single module. The above-mentioned integrated modules may be implemented in the form of hardware or software functional modules.

[0301] In one possible implementation, apparatus 300 is used to implement the functions of the network device in the above method. The apparatus may be a network device or another device capable of implementing the functions of the network device. The other device may be installed in the network device or used in conjunction with the network device.

[0302] The apparatus 300 includes a receiving module 301 for receiving a signal or information, for example, for receiving a PUSCH from a terminal device.

[0303] The apparatus 300 includes a sending module 302 for sending a signal or information, for example, for sending one or more of the following signals to a terminal device: a first DCI, a second DCI, and a PDSCH.

[0304] The apparatus 300 includes a processing module 303 for processing received signals or information, for example, for decoding signals or information received by the receiving module 301. The processing module 303 may also generate signals or information to be transmitted, for example, for generating signals or information to be transmitted by the transmitting module 302.

[0305] like Figure 4 Shown is a device 400 provided in an embodiment of the present application.

[0306] In one possible implementation, the device 400 is used to implement the functions of the terminal device in the above method. The device can be a terminal device or other device that can implement the functions of the terminal device. Among them, the other device can be installed in the terminal device or can be used in combination with the terminal device. For example, the device 400 can be a chip system. In the embodiment of the present application, the chip system can be composed of chips, or it can include chips and other discrete devices. The device 400 includes at least one processor 420, which is used to implement the functions of the terminal device in the method provided in the embodiment of the present application. For example, the processor 420 can generate and send signals such as PUSCH, and can be used to receive and process one or more of the following signals: a first DCI, a second DCI, and PDSCH. For details, please refer to the detailed description in the method example, which will not be repeated here.

[0307] The device 400 may also include at least one memory 430 for storing program instructions and / or data. The memory 430 is coupled to the processor 420. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, which may be electrical, mechanical, or other forms, and is used for information exchange between the devices, units, or modules. The processor 420 may operate in conjunction with the memory 430. The processor 420 may execute program instructions stored in the memory 430. At least one of the at least one memory may be included in the processor 420.

[0308] Apparatus 400 may further include a communication interface 410 for communicating with other devices via a transmission medium, thereby enabling the apparatus in apparatus 400 to communicate with the other devices. For example, the other devices may be network devices. Processor 420 utilizes communication interface 410 to send and receive signals and implement the functions of the terminal device described in the above method embodiments.

[0309] In one possible implementation, the device 400 is used to implement the functions of the network device in the above method. The device can be a network device or other device that can implement the functions of the network device. Among them, the other device can be installed in the network device or can be used in combination with the network device. For example, the device 400 can be a chip system. The device 400 includes at least one processor 420, which is used to implement the functions of the network device in the method provided in the embodiment of the present application. Exemplarily, the processor 420 can receive and process signals such as PUSCH, and can be used to generate and send one or more of the following signals: a first DCI, a second DCI, and a PDSCH. For details, please refer to the detailed description in the method example, which will not be repeated here.

[0310] Device 400 may also include at least one memory 430 for storing program instructions and / or data. Memory 430 is coupled to processor 420. Processor 420 may operate in conjunction with memory 430. Processor 420 may execute program instructions stored in memory 430. At least one of the at least one memory may be included in processor 420.

[0311] Apparatus 400 may also include a communication interface 410 for communicating with other devices via a transmission medium, thereby enabling the apparatus in apparatus 400 to communicate with the other devices. For example, the other device may be a terminal device. Processor 420 utilizes communication interface 410 to send and receive signals and implement the network device functions described in the above method embodiments.

[0312] The specific connection medium between the communication interface 410, the processor 420 and the memory 430 is not limited in the embodiment of the present application. Figure 4The memory 430, the processor 420 and the transceiver 410 are connected via a bus 440. Figure 4 The connections between the other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0313] In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application may be directly implemented as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0314] In an embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in an embodiment of the present application may also be a circuit or any other device that can implement a storage function, for storing program instructions and / or data.

[0315] The technical solutions provided in the embodiments of the present application can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, they can 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 program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a terminal device, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium.

[0316] In the embodiments of the present application, under the premise that there is no logical contradiction, the embodiments may reference each other, for example, the methods and / or terms between method embodiments may reference each other, for example, the functions and / or terms between device embodiments may reference each other, for example, the functions and / or terms between device embodiments and method embodiments may reference each other.

[0317] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A control information transmission method, characterized in that: The method comprises: Detecting first downlink control information DCI in a first search space; Among them, the first DCI is used to indicate the activated bandwidth part BWP of the terminal device, and the activated BWP is used for the terminal device and the network device to transmit the physical data channel. The size of the first DCI and the size of the second DCI are aligned, and the second DCI is a DCI that can be transmitted in the first common search space. The second DCI is used to schedule system messages, paging messages, or random access responses RAR; the first DCI includes a frequency domain resource allocation domain, which is used to indicate the frequency domain resources allocated to the physical data channel in the activated BWP; the size of the frequency domain resource allocation domain is determined according to the bandwidth of the initial BWP, and the initial BWP is used for the terminal device to receive the synchronization signal block SSB from the network device.

2. The method according to claim 1, characterized in that The first search space includes a first specific search space.

3. The method according to claim 2, characterized in that The first specific search space is included in multiple specific search spaces of the terminal device, one specific search space among the multiple specific search spaces corresponds to N1 DCI formats, and the multiple specific search spaces correspond to N2 DCI formats in total. The DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1.

4. The method according to any one of claims 1 to 3, characterized in that The size of the first DCI and the size of the second DCI are aligned, including: The number of bits of the bit stream of the first DCI is equal to the number of bits of the bit stream of the second DCI; The bit stream of the first DCI is the information bit stream of the first DCI, or the bit stream of the first DCI is a bit stream obtained by padding or truncating the information bit stream of the first DCI, and the bit stream of the second DCI is the information bit stream of the second DCI; or The first DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the first DCI, and the second DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the second DCI, wherein the first operation includes one or more of the following operations: adding cyclic redundancy check (CRC) bits, channel coding, and scrambling; or, The number of modulation symbols corresponding to the first DCI is equal to the number of modulation symbols corresponding to the second DCI.

5. The method according to any one of claims 1 to 3, characterized in that The first DCI can also be transmitted in a second common search space.

6. The method according to any one of claims 1 to 3, characterized in that The physical data channel includes a physical downlink shared channel PDSCH or a physical uplink shared channel PUSCH, and the first DCI is further used to indicate whether the first DCI is used to schedule the PDSCH or the PUSCH.

7. The method according to any one of claims 1 to 3, characterized in that The CRC bits of the first DCI are scrambled using the radio network temporary identifier RNTI specific to the terminal device.

8. A control information transmission method, characterized in that: The method comprises: Sending first downlink control information DCI to the terminal device in the first search space; In which, the first DCI is used to indicate the activated bandwidth part BWP of the terminal device, and the activated BWP is used for the terminal device and the network device to transmit the physical data channel. The size of the first DCI and the size of the second DCI are aligned, and the second DCI is a DCI that can be transmitted in the first common search space. The second DCI is used to schedule system messages, paging messages, or random access responses RAR; the first DCI includes a frequency domain resource allocation domain, which is used to indicate the frequency domain resources allocated to the physical data channel in the activated BWP; the size of the frequency domain resource allocation domain is determined according to the bandwidth of the initial BWP, and the initial BWP is used to send a synchronization signal block SSB to the terminal device.

9. The method according to claim 8, characterized in that The first search space includes a first specific search space.

10. The method according to claim 9, characterized in that The first specific search space is included in multiple specific search spaces of the terminal device, one specific search space among the multiple specific search spaces corresponds to N1 DCI formats, and the multiple specific search spaces correspond to N2 DCI formats in total. The DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1.

11. The method according to any one of claims 8 to 10, characterized in that: The size of the first DCI and the size of the second DCI are aligned, including: The number of bits of the bit stream of the first DCI is equal to the number of bits of the bit stream of the second DCI; The bit stream of the first DCI is the information bit stream of the first DCI, or the bit stream of the first DCI is a bit stream obtained by padding or truncating the information bit stream of the first DCI, and the bit stream of the second DCI is the information bit stream of the second DCI; or The first DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the first DCI, and the second DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the second DCI, wherein the first operation includes one or more of the following operations: adding cyclic redundancy check (CRC) bits, channel coding, and scrambling; or, The number of modulation symbols corresponding to the first DCI is equal to the number of modulation symbols corresponding to the second DCI.

12. The method according to any one of claims 8 to 10, characterized in that The first DCI can also be transmitted in a second common search space.

13. The method according to any one of claims 8 to 10, characterized in that: The physical data channel includes a physical downlink shared channel PDSCH or a physical uplink shared channel PUSCH, and the first DCI is further used to indicate whether the first DCI is used to schedule the PDSCH or the PUSCH.

14. The method according to any one of claims 8 to 10, characterized in that The CRC bits of the first DCI are scrambled using the radio network temporary identifier RNTI specific to the terminal device.

15. A communication device, characterized in that: Including communication module, The communication module is configured to detect first downlink control information DCI in a first search space; Among them, the first DCI is used to indicate the activated bandwidth part BWP of the communication device, and the activated BWP is used for the communication device and the network equipment to transmit the physical data channel. The size of the first DCI and the size of the second DCI are aligned, and the second DCI is a DCI that can be transmitted in the first common search space. The second DCI is used to schedule system messages, paging messages, or random access responses RAR; the first DCI includes a frequency domain resource allocation domain, which is used to indicate the frequency domain resources allocated to the physical data channel in the activated BWP; the size of the frequency domain resource allocation domain is determined according to the bandwidth of the initial BWP, and the initial BWP is used for the communication device to receive the synchronization signal block SSB from the network equipment.

16. The device according to claim 15, characterized in that The first search space includes a first specific search space.

17. The device according to claim 16, characterized in that The first specific search space is included in multiple specific search spaces of the communication device, one specific search space among the multiple specific search spaces corresponds to N1 DCI formats, and the multiple specific search spaces correspond to N2 DCI formats in total. The DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1.

18. The device according to any one of claims 15 to 17, characterized in that The size of the first DCI and the size of the second DCI are aligned, including: The number of bits of the bit stream of the first DCI is equal to the number of bits of the bit stream of the second DCI; The bit stream of the first DCI is the information bit stream of the first DCI, or the bit stream of the first DCI is a bit stream obtained by padding or truncating the information bit stream of the first DCI, and the bit stream of the second DCI is the information bit stream of the second DCI; or The first DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the first DCI, and the second DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the second DCI, wherein the first operation includes one or more of the following operations: adding cyclic redundancy check (CRC) bits, channel coding, and scrambling; or, The number of modulation symbols corresponding to the first DCI is equal to the number of modulation symbols corresponding to the second DCI.

19. The device according to any one of claims 15 to 17, characterized in that The first DCI can also be transmitted in a second common search space.

20. The device according to any one of claims 15 to 17, characterized in that The physical data channel includes a physical downlink shared channel PDSCH or a physical uplink shared channel PUSCH, and the first DCI is further used to indicate whether the first DCI is used to schedule the PDSCH or the PUSCH.

21. The device according to any one of claims 15 to 17, characterized in that The CRC bits of the first DCI are scrambled using a radio network temporary identifier RNTI specific to the communication device.

22. A communication device, characterized in that: The method comprises a processor and a memory, wherein the memory and the processor are coupled, and the processor is configured to execute the method according to any one of claims 1 to 7.

23. A communication device, characterized in that: Including processor and communication interface, The processor detects, by using the communication interface, first downlink control information DCI in a first search space; Among them, the first DCI is used to indicate the activated bandwidth part BWP of the communication device, and the activated BWP is used for the communication device and the network equipment to transmit the physical data channel. The size of the first DCI and the size of the second DCI are aligned, and the second DCI is a DCI that can be transmitted in the first common search space. The second DCI is used to schedule system messages, paging messages, or random access responses RAR; the first DCI includes a frequency domain resource allocation domain, which is used to indicate the frequency domain resources allocated to the physical data channel in the activated BWP; the size of the frequency domain resource allocation domain is determined according to the bandwidth of the initial BWP, and the initial BWP is used to send a synchronization signal block SSB to the communication device.

24. A communication device, characterized in that: Including communication module, Sending first downlink control information DCI to the terminal device in the first search space; In which, the first DCI is used to indicate the activated bandwidth part BWP of the terminal device, and the activated BWP is used for the terminal device and the communication device to transmit the physical data channel. The size of the first DCI and the size of the second DCI are aligned, and the second DCI is a DCI that can be transmitted in the first common search space. The second DCI is used to schedule system messages, paging messages, or random access responses RAR; the first DCI includes a frequency domain resource allocation domain, which is used to indicate the frequency domain resources allocated to the physical data channel in the activated BWP; the size of the frequency domain resource allocation domain is determined according to the bandwidth of the initial BWP, and the initial BWP is used to send a synchronization signal block SSB to the terminal device.

25. The device according to claim 24, characterized in that The first search space includes a first specific search space.

26. The device according to claim 25, characterized in that The first specific search space is included in multiple specific search spaces of the terminal device, one specific search space among the multiple specific search spaces corresponds to N1 DCI formats, and the multiple specific search spaces correspond to N2 DCI formats in total. The DCIs of the N2 DCI formats are aligned in size when transmitted in the corresponding specific search space, wherein N1 is an integer greater than or equal to 1, and N2 is an integer greater than or equal to N1.

27. The device according to any one of claims 24 to 26, characterized in that The size of the first DCI and the size of the second DCI are aligned, including: The number of bits of the bit stream of the first DCI is equal to the number of bits of the bit stream of the second DCI; The bit stream of the first DCI is the information bit stream of the first DCI, or the bit stream of the first DCI is a bit stream obtained by padding or truncating the information bit stream of the first DCI, and the bit stream of the second DCI is the information bit stream of the second DCI; or The first DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the first DCI, and the second DCI bit stream is a bit stream obtained by performing a first operation on the information bit stream of the second DCI, wherein the first operation includes one or more of the following operations: adding cyclic redundancy check (CRC) bits, channel coding, and scrambling; or, The number of modulation symbols corresponding to the first DCI is equal to the number of modulation symbols corresponding to the second DCI.

28. The device according to any one of claims 24 to 26, characterized in that The first DCI can also be transmitted in a second common search space.

29. The device according to any one of claims 24 to 26, characterized in that The physical data channel includes a physical downlink shared channel PDSCH or a physical uplink shared channel PUSCH, and the first DCI is further used to indicate whether the first DCI is used to schedule the PDSCH or the PUSCH.

30. The device according to any one of claims 24 to 26, characterized in that The CRC bits of the first DCI are scrambled using the radio network temporary identifier RNTI specific to the terminal device.

31. A communication device, characterized in that: The method comprises a processor and a memory, wherein the memory is coupled to the processor, and the processor is configured to execute the method according to any one of claims 8 to 14.

32. A communication device, characterized in that: Including processor and communication interface, The processor sends, by using the communication interface, first downlink control information DCI to the terminal device in a first search space; The first DCI is used to indicate an activated bandwidth part (BWP) of the terminal device, the activated BWP is used for the terminal device and the network device to transmit a physical data channel, the size of the first DCI is aligned with the size of the second DCI, the second DCI is a DCI that can be transmitted in a first common search space, and the second DCI is used to schedule a system message, a paging message, or a random access response (RAR); the first DCI includes a frequency domain resource allocation field, which is used to indicate the frequency domain resources allocated for the physical data channel in the activated BWP; The size of the frequency domain resource allocation domain is determined according to the bandwidth of an initial BWP, and the initial BWP is used to send a synchronization signal block SSB to the terminal device.

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