Control information transmission method, device and system

Abstract

The embodiments of the present application provide a control information transmission method, device and system, which relate to the field of communication technology and can solve the technical problem that when a terminal device performs bandwidth partial BWP switching, the detected downlink control information DCI formats are many, the detection complexity is high, the power consumption is large, and it is not conducive to power saving. The method includes: a first terminal device receives a DCI for indicating a BWP from a network device, wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, and the BWP is used to transmit the physical data channel.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a control information transmission method, device and system. Background Art

[0002] With the rapid development of the fifth-generation (5G) mobile communication new radio (NR) technology, enhanced mobile broadband (eMBB) services, ultra-reliability low-latency communication (URLLC) services, and massive machine-type communication (mMTC) services have been proposed one after another. In order to facilitate the large-scale application of the above services, most terminal devices require low costs. Summary of the invention

[0003] In view of this, the purpose of the embodiments of the present application is to provide a control information transmission method, device and system, which can avoid the technical problem that when the terminal device performs BWP switching, a large number of DCI formats are detected, the detection complexity is high, the power consumption is large, and it is not conducive to power saving.

[0004] In order to achieve the above purpose, the embodiment of the present application adopts the following technical solution:

[0005] In a first aspect, an embodiment of the present application provides a control information transmission method, which can be executed by a network device, a chip or other apparatus, and the method may include: sending a DCI for indicating BWP to a first terminal device; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, and the BWP is used to transmit a physical data channel.

[0006] Based on the first aspect, the number of bits of the DCI sent by the network device to the first terminal device for indicating BWP is fixed, so that when the first terminal device blindly detects the DCI sent by the network device, it can perform a blind detection through a detection device with the fixed number of bits. In this way, while ensuring data transmission efficiency, the number of DCI sizes detected by the first terminal device can be reduced, thereby reducing the number of times the first terminal device blindly detects DCI, reducing the detection complexity, and thus reducing the power consumption of the first terminal device, achieving the purpose of power saving, and facilitating large-scale application of services related to the first terminal device.

[0007] In one possible design, in combination with the first aspect, the number of DCI bits is a fixed number of bits, including: the number of DCI bits is predefined; or the number of DCI bits is determined according to the maximum bandwidth supported by the first terminal device; or the number of DCI bits is determined according to the bandwidth of the control resource set CORESET#0; or the number of DCI bits is aligned with or the same as the number of DCI bits used to schedule public information, wherein the public information includes system messages, paging messages, or random access responses RAR.

[0008] Based on this possible design, in the embodiment of the present application, the number of bits of the DCI used to indicate the BWP can be predefined, or can be determined based on the maximum bandwidth supported by the first terminal device, or can be determined based on the bandwidth of CORESET#0, or can be determined based on the DCI used to schedule public information, or can be determined in other ways without limitation. A feasible solution is provided for the network device to determine the number of bits of the DCI used to indicate the BWP.

[0009] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a DAI field for indicating the BWP; or the DCI does not include a downlink allocation index DAI field.

[0010] In one possible design, in combination with the first aspect or the possible design of the first aspect, it is determined that the hybrid automatic repeat request HARQ feedback mode of the first terminal device for the downlink physical data channel transmitted in the downlink physical data channel transmission window is a static codebook mode.

[0011] Based on the above two possible designs, all bits of the DAI field in the DCI can be used to indicate BWP, and the bits used to indicate BWP can continue to be called the DAI field. At this time, the number of bits used to indicate BWP can be fixed, that is, the number of bits used to indicate BWP is all bits of the above DAI field.

[0012] Alternatively, the bits used to indicate BWP may also be called other fields, such as a BWP indication field, in which case the DCI does not include a DAI field. The number of bits used to indicate BWP may be fixed, that is, the number of bits used to indicate BWP is all the bits of the above DAI field.

[0013] When all bits of the DAI field in the DCI are used to indicate BWP, it can be determined that the hybrid automatic repeat request HARQ feedback mode of the first terminal device for the downlink physical data channel transmitted in the downlink physical data channel transmission window is a static codebook mode. On the basis of reducing the impact on the feedback codebook of the first terminal device, the DCI is aligned with the DCI bit number of the scheduling public information transmission, the detection complexity is reduced, and the power consumption of the first terminal device is reduced.

[0014] In addition, the DCI may also include a first indication field, which indicates the number of bits used to indicate the BWP, so that the first terminal device can clearly indicate the number of bits used to indicate the BWP according to the first indication field after receiving the DCI. The number of bits of the first indication field may also be fixed. Optionally, the first indication field may be a portion of the bits used to indicate the BWP.

[0015] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a downlink allocation index DAI field; wherein the DAI field includes M1 bits, M2 bits of the M1 bits are used to indicate BWP, and M1 is the number of bits used when sending the DAI field to the second terminal device.

[0016] In one possible design, in combination with the first aspect or the possible design of the first aspect, the M1-M2 bits in the DAI field are used to indicate to the first terminal device the number of downlink physical data channels transmitted in the downlink physical data channel transmission window, where “-” represents a minus sign.

[0017] Based on the above two possible designs, some bits of the DAI field in the DCI can be used to indicate BWP, and the bits used to indicate BWP can continue to be called the DAI field. At this time, some bits of the DAI field are used to indicate BWP, and other bits are used to indicate the number of downlink physical data channels transmitted in the downlink physical data channel transmission window for the first terminal device.

[0018] Among them, a fixed number of bits can be selected from the DAI field to indicate BWP, that is, the number of bits used to indicate BWP is a fixed number of bits. In addition, the DCI may include a first indication field, which indicates the number of bits used to indicate BWP, so that the first terminal device can clearly indicate the number of bits used to indicate BWP according to the first indication field after receiving the DCI. The first indication field can be part of the bits in the above-mentioned DAI field.

[0019] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a downlink allocation index DAI field and a BWP indication field; wherein the DAI field includes M1-M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate the BWP, and the DAI field is used to indicate the number of downlink physical data channels transmitted in the downlink physical data channel transmission window for the first terminal device, and M1 is the number of bits used when sending the DAI field to the second terminal device.

[0020] Based on this possible design, some bits of the DAI field in the DCI may be used to indicate the BWP, and the bits used to indicate the BWP may be called a BWP indication field. In this case, the DCI includes the DAI field and the BWP indication field.

[0021] Among them, a fixed number of bits can be selected from the DAI field to indicate BWP, that is, the number of bits used to indicate BWP is a fixed number of bits. In addition, the DCI may include a first indication field, which indicates the number of bits used to indicate BWP, so that the first terminal device can clearly indicate the number of bits used to indicate BWP according to the first indication field after receiving the DCI. The first indication field can be part of the bits in the above-mentioned DAI field.

[0022] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a physical uplink control channel PUCCH resource indication field; wherein the PUCCH resource indication field is used to indicate BWP; or the DCI does not include a physical uplink control channel PUCCH resource indication field.

[0023] In one possible design, in combination with the first aspect or a possible design of the first aspect, it is determined that the first terminal device determines that the PUCCH resource is predefined.

[0024] Based on the above two possible designs, all bits of the PUCCH resource indication field in the DCI can be used to indicate the BWP, and the bits used to indicate the BWP can continue to be called the PUCCH resource indication field. At this time, the number of bits used to indicate the BWP can be fixed, that is, the number of bits used to indicate the BWP is all the bits of the above PUCCH resource indication field.

[0025] Alternatively, the bit used to indicate BWP may also be called other fields, such as a BWP indication field, in which case the DCI does not include a PUCCH resource indication field. The number of bits used to indicate BWP may be fixed, that is, the number of bits used to indicate BWP is all the bits of the PUCCH resource indication field.

[0026] When all bits of the PUCCH resource indication field in the DCI are used to indicate the BWP, it can be determined that the PUCCH resource is predefined. On the basis of having no impact on the PUCCH resource indication of the first terminal device, the DCI is aligned with the number of DCI bits for scheduling public information transmission, reducing the detection complexity and thus reducing the power consumption of the first terminal device. In an embodiment of the present application, a parameter is predefined, and it can be considered that the value of the parameter is fixed or pre-negotiated, and is known in advance by the network device and the first terminal device.

[0027] In addition, the DCI may also include a first indication field, which indicates the number of bits used to indicate the BWP, so that the first terminal device can clearly indicate the number of bits used to indicate the BWP according to the first indication field after receiving the DCI. The number of bits of the first indication field may also be fixed. Optionally, the first indication field may be a portion of the bits used to indicate the BWP.

[0028] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a physical uplink control channel PUCCH resource indication field; wherein the PUCCH resource indication field includes M3 bits, M2 bits of the M3 bits are used to indicate BWP, and M3 is the number of bits used when sending the PUCCH resource indication field to the second terminal device.

[0029] In a possible design, in combination with the first aspect or the possible design of the first aspect, the M3-M2 bits in the PUCCH resource indication field are used to indicate the PUCCH resource for the first terminal device, where “-” represents a minus sign.

[0030] Based on the above two possible designs, some bits of the PUCCH resource indication field in the DCI can be used to indicate the BWP, and the bits used to indicate the BWP can continue to be called the PUCCH resource indication field. At this time, some bits of the PUCCH resource indication field are used to indicate the BWP, and the other bits are used to indicate the PUCCH resources for the first terminal device.

[0031] Among them, a fixed number of bits can be selected from the PUCCH resource indication field to indicate the BWP, that is, the number of bits used to indicate the BWP is a fixed number of bits. In addition, the DCI may include a first indication field, which indicates the number of bits used to indicate the BWP, so that the first terminal device can clearly indicate the number of bits used to indicate the BWP according to the first indication field after receiving the DCI. The number of bits of the first indication field may also be fixed. Optionally, the first indication field may be part of the bits in the PUCCH resource indication field.

[0032] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a physical uplink control channel PUCCH resource indication field and a BWP indication field; wherein, the PUCCH resource indication field includes M3-M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate the BWP, the PUCCH resource indication field is used to indicate the PUCCH resources for the first terminal device, and M3 is the number of bits used when sending the PUCCH resource indication field to the second terminal device.

[0033] Based on this possible design, some bits of the PUCCH resource indication field in the DCI can be used to indicate the BWP, and the bits used to indicate the BWP can be called the BWP indication field. At this time, the DCI includes the PUCCH resource indication field and the BWP indication field.

[0034] Among them, a fixed number of bits can be selected from the PUCCH resource indication field to indicate the BWP, that is, the number of bits used to indicate the BWP is a fixed number of bits. In addition, the DCI may include a first indication field, and the first indication field includes the number of bits used to indicate the BWP, so that the first terminal device can clearly indicate the number of bits used to indicate the BWP according to the first indication field after receiving the DCI. The number of bits of the first indication field may also be fixed. Optionally, the first indication field may be part of the bits in the PUCCH resource indication field.

[0035] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a timing indication field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback; wherein the timing indication field between the PDSCH and the HARQ feedback is used to indicate the BWP; or the DCI does not include a timing indication field between the physical downlink shared channel PDSCH and the hybrid automatic repeat request HARQ feedback.

[0036] In one possible design, in combination with the first aspect or a possible design of the first aspect, the timing relationship between PDSCH and HARQ feedback is predefined.

[0037] Based on the above two possible designs, all bits of the timing indication field between PDSCH and HARQ feedback in DCI can be used to indicate BWP, and the bits used to indicate BWP can continue to be called the timing indication field between PDSCH and HARQ feedback. At this time, the number of bits used to indicate BWP can be fixed, that is, the number of bits used to indicate BWP is all bits of the timing indication field between PDSCH and HARQ feedback.

[0038] Alternatively, the bit used to indicate the BWP may also be referred to as another field, such as a BWP indication field, in which case the DCI does not include a timing indication field between the PDSCH and the HARQ feedback. The number of bits used to indicate the BWP may be fixed, that is, the number of bits used to indicate the BWP is all the bits of the timing indication field between the PDSCH and the HARQ feedback.

[0039] When all bits of the timing indication field between PDSCH and HARQ feedback in DCI are used to indicate BWP, it can be determined that the timing relationship between PDSCH and HARQ feedback determined by the first terminal device is predefined. On the basis of reducing the impact on the timing relationship between PDSCH and HARQ feedback indicated by the first terminal device, it can be ensured that the DCI is aligned with the number of DCI bits for scheduling public information transmission, reducing the detection complexity, and thus reducing the power consumption of the first terminal device.

[0040] In addition, the DCI may also include a first indication field, which includes the number of bits used to indicate the BWP, so that the first terminal device can clearly indicate the number of bits used to indicate the BWP according to the first indication field after receiving the DCI. The number of bits of the first indication field may also be fixed. Optionally, the first indication field may be a portion of the bits used to indicate the BWP.

[0041] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a timing indication field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback; wherein the timing indication field between the PDSCH and the HARQ feedback includes M4 bits, M2 bits of the M4 bits are used to indicate BWP, and M4 is the number of bits used when sending the timing indication field between the PDSCH and the HARQ feedback to the second terminal device.

[0042] In one possible design, in combination with the first aspect or the possible design of the first aspect, the M4-M2 bits in the timing indication field between PDSCH and HARQ feedback are used to indicate the timing relationship between PDSCH and HARQ feedback for the first terminal device, where "-" represents a minus sign.

[0043] Based on the above two possible designs, some bits of the timing indication field between PDSCH and HARQ feedback in DCI can be used to indicate BWP, and the bits used to indicate BWP can continue to be called the timing indication field between PDSCH and HARQ feedback. At this time, some bits of the timing indication field between PDSCH and HARQ feedback are used to indicate BWP, and the other bits are used to indicate the timing relationship between PDSCH and HARQ feedback for the first terminal device.

[0044] Among them, a fixed number of bits can be selected from the timing indication field between PDSCH and HARQ feedback to indicate BWP, that is, the number of bits used to indicate BWP is a fixed number of bits. In addition, the DCI may include a first indication field, which indicates the number of bits used to indicate BWP, so that the first terminal device can clearly indicate the number of bits used to indicate BWP according to the first indication field after receiving the DCI. Optionally, the first indication field can be a part of the bits in the timing indication field between PDSCH and HARQ feedback.

[0045] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a timing indication field and a BWP indication field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback; wherein, the timing indication field between the PDSCH and the HARQ feedback includes M4-M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate the BWP, and the timing indication field between the PDSCH and the HARQ feedback is used to indicate the timing relationship between the PDSCH and the HARQ feedback for the first terminal device, and M4 is the number of bits used when sending the timing indication field between the PDSCH and the HARQ feedback to the second terminal device.

[0046] Based on this possible design, some bits of the timing indication field between PDSCH and HARQ feedback in DCI can be used to indicate BWP, and the bits used to indicate BWP can be called BWP indication field. At this time, DCI includes the timing indication field between PDSCH and HARQ feedback and the BWP indication field.

[0047] Among them, a fixed number of bits can be selected from the timing indication field between PDSCH and HARQ feedback to indicate BWP, that is, the number of bits used to indicate BWP is a fixed number of bits. In addition, the DCI may include a first indication field, which indicates the number of bits used to indicate BWP, so that the first terminal device can clearly indicate the number of bits used to indicate BWP according to the first indication field after receiving the DCI. Optionally, the first indication field can be a part of the bits in the timing indication field between PDSCH and HARQ feedback.

[0048] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a frequency domain resource allocation field; wherein the frequency domain resource allocation field includes M5 bits, M2 bits of the M5 bits are used to indicate BWP, and M5 is the number of bits used when sending the frequency domain resource allocation field to the second terminal device.

[0049] In one possible design, in combination with the first aspect or the possible design of the first aspect, the M5-M2 bits in the frequency domain resource allocation field are used to indicate the allocated frequency domain resources for the first terminal device, where "-" represents a minus sign.

[0050] Based on the above two possible designs, some bits of the frequency domain resource allocation field in the DCI can be used to indicate BWP, and the bits used to indicate BWP can continue to be called the frequency domain resource allocation field. At this time, some bits of the frequency domain resource allocation field are used to indicate BWP, and other bits are used to indicate frequency domain resource allocation for the first terminal device.

[0051] Among them, a fixed number of bits can be selected from the frequency domain resource allocation field to indicate BWP, that is, the number of bits used to indicate BWP is a fixed number of bits. In addition, the DCI may include a first indication field, which indicates the number of bits used to indicate BWP, so that the first terminal device can clearly indicate the number of bits used to indicate BWP according to the first indication field after receiving the DCI. Optionally, the first indication field may be part of the bits in the frequency domain resource allocation field.

[0052] In one possible design, in combination with the first aspect or the possible design of the first aspect, the DCI includes a frequency domain resource allocation field and a BWP indication field; wherein the frequency domain resource allocation field includes M5-M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate the BWP, the frequency domain resource allocation field is used to indicate the allocated frequency domain resources for the first terminal device, and M5 is the number of bits used when sending the frequency domain resource allocation field to the second terminal device.

[0053] Based on this possible design, some bits of the frequency domain resource allocation field in the DCI can be used to indicate the BWP, and the bits used to indicate the BWP can be called the BWP indication field. At this time, the DCI includes the frequency domain resource allocation field and the BWP indication field.

[0054] Among them, a fixed number of bits can be selected from the frequency domain resource allocation field to indicate BWP, that is, the number of bits used to indicate BWP is a fixed number of bits. In addition, the first indication field in the DCI indicates the number of bits used to indicate BWP, so that the first terminal device can clearly indicate the number of bits used to indicate BWP according to the first indication field after receiving the DCI. Optionally, the first indication field can be part of the bits in the frequency domain resource allocation field.

[0055] In one possible design, in combination with the first aspect or the possible design of the first aspect, the number of bits used to indicate BWP is determined according to the maximum number of BWPs corresponding to the first terminal device; or the number of bits used to indicate BWP is determined according to the maximum bandwidth of the first terminal device; or the number of bits used to indicate BWP is determined according to the bandwidth used to transmit public information.

[0056] Based on this possible design, the network device may adopt one of the above methods to determine the number of bits used to indicate BWP, which provides a feasible solution for the network device to determine the number of bits used to indicate BWP.

[0057] In one possible design, in combination with the first aspect or the possible design of the first aspect, DCI is used to indicate BWP, including: case one: the DCI includes a downlink allocation index DAI field for indicating BWP; or case two: the DCI includes a physical uplink control channel PUCCH resource indication field for indicating BWP; or case three: the DCI includes a timing field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback for indicating BWP; or case four: the DCI includes a frequency domain resource allocation field for indicating BWP; or case five: the DCI includes a BWP indication field for indicating BWP.

[0058] Based on this possible design, the descriptions of Cases 1 to 5 above can also be adopted without limitation.

[0059] In one possible design, in combination with the first aspect or the possible design of the first aspect, second indication information is sent to the first terminal device; wherein the second indication information is used to indicate one from a plurality of candidate situations, used to indicate BWP to the first terminal device, and the plurality of candidate situations include at least two of situations one to five.

[0060] Based on this possible design, the network device can send second indication information to the first terminal device, so that the first terminal device can clearly indicate which of the above situations 1 to 5 the DCI used to indicate the BWP is according to the second indication information.

[0061] In one possible design, in combination with the first aspect or the possible design of the first aspect, only a DCI format with a DCI bit size is configured in the user equipment UE-specific search space USS corresponding to the first terminal device.

[0062] Based on this possible design, the network device only configures a DCI format with a DCI bit size in the USS of the first terminal device, so that the first terminal device can detect the received DCI only according to the DCI format, thereby reducing the number of blind detections of DCI by the first terminal device and reducing the detection complexity, thereby reducing the power consumption of the first terminal device, achieving the purpose of power saving, and facilitating large-scale application of services related to the first terminal device.

[0063] In a second aspect, the present application provides a communication device, which may be a network device or other device capable of implementing the method of the first aspect. The other device may be a chip or system on chip in the network device, or may be a module or unit for implementing the control information transmission method described in the embodiment of the present application. The other device can be used in combination with the network device or installed in the network device. The communication device can implement the functions performed by the network device in the above-mentioned aspects or possible designs, and the functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions. In one design, the device may include a module corresponding to the method / operation / step / action described in the first aspect, and the module may be a hardware circuit, or may be software, or may be a combination of a hardware circuit and software. In one design, the communication device may include: a sending unit;

[0064] A sending unit is used to send a DCI for indicating BWP to the first terminal device; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, and the BWP is used to transmit the physical data channel.

[0065] The specific implementation of the communication device can refer to the behavior function of the network device in the control information transmission method provided by the first aspect or any possible design of the first aspect, and will not be repeated here. Therefore, the provided communication device can achieve the same beneficial effects as the first aspect or any possible design of the first aspect.

[0066] In a third aspect, a communication device is provided, which may be a network device or other device capable of implementing the method of the first aspect. The other device may be a chip or system on chip in the network device. The other device can be used in combination with the network device or installed in the network device. The communication device can implement the functions performed by the network device in the above aspects or possible designs, and the functions can be implemented by hardware. In one possible design, the communication device may include: a processor and a communication interface, and the processor may be used to support the communication device to implement the functions involved in the above first aspect or any possible design of the first aspect, for example: the processor is used to send a DCI for indicating BWP to the first terminal device through the communication interface; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, and the BWP is used to transmit a physical data channel. In another possible design, the communication device may also include a memory, and the memory is used to store computer instructions and / or data. When the processor executes the computer instructions stored in the memory, the communication device executes the control information transmission method described in the above first aspect or any possible design of the first aspect. In an embodiment of the present application, the communication interface may be a transceiver, an interface circuit, a bus interface, a pin or other device capable of implementing transceiver functions.

[0067] In a fourth aspect, a computer-readable storage medium is provided, wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer can execute the method described in the first aspect or any possible design of the above aspects.

[0068] In a fifth aspect, a computer program product comprising instructions is provided. The computer program product may include program instructions. When the computer program product runs on a computer, the computer can execute the method described in the first aspect or any possible design of the above aspects.

[0069] In a sixth aspect, a chip system is provided, the chip system includes a processor and a communication interface, the chip system can be used to implement the functions performed by the network device in the above-mentioned first aspect or any possible design of the first aspect, for example, the processor is used to send a DCI for indicating BWP to the first terminal device through the communication interface; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, and the BWP is used to transmit a physical data channel. In one possible design, the chip system also includes a memory, the memory is used to store program instructions and / or data, and when the processor executes the program instructions stored in the memory, the chip system executes the method described in the above-mentioned first aspect or any possible design of the first aspect. The chip system can be composed of chips, and can also include chips and other discrete devices, without limitation.

[0070] In a seventh aspect, an embodiment of the present application provides a control information transmission method, which can be executed by a first terminal device, a chip or other device, and the method may include: receiving a DCI from a network device; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, the DCI is used to indicate a BWP, and the BWP is used to transmit a physical data channel. The method may also include transmitting a physical data channel according to the DCI. For example, if the DCI schedules a downlink physical data channel, the method includes receiving a downlink physical data channel from the network device according to the DCI; if the DCI schedules an uplink physical data channel, the method includes sending an uplink physical data channel to the network device according to the DCI.

[0071] For a detailed introduction to DCI, etc., please refer to the first aspect, which will not be repeated here.

[0072] In one possible design, in combination with the seventh aspect, when the DCI includes a downlink allocation index DAI field for indicating BWP; or when the DCI does not include a downlink allocation index DAI field, the first terminal device can determine the hybrid automatic repeat request HARQ feedback of the downlink physical data channel transmitted in the downlink physical data channel transmission window according to a static codebook method.

[0073] In one possible design, in combination with the seventh aspect, when the DCI includes a physical uplink control channel PUCCH resource indication field for indicating BWP; or, when the DCI does not include a physical uplink control channel PUCCH resource indication field, the first terminal device can determine the PUCCH resources according to predefinition.

[0074] In one possible design, in combination with the seventh aspect, when the DCI includes a timing indication field between a physical downlink shared channel PDSCH for indicating BWP and a hybrid automatic repeat request HARQ feedback; or, when the DCI does not include a timing indication field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback, the first terminal device can determine the timing relationship between the PDSCH and the HARQ feedback according to a predefined method.

[0075] In one possible design, in combination with the seventh aspect or a possible design of the seventh aspect, the first terminal device receives the DCI with the fixed number of bits from the network device; and interprets the received DCI according to the DCI format of the DCI.

[0076] In an eighth aspect, the present application provides a communication device, which may be a first terminal device or other device capable of implementing the method of the second aspect. The other device may be a chip or system on chip in the first terminal device, or may be a module or unit in the first terminal device for implementing the control information transmission method described in the embodiment of the present application. The other device can be used in conjunction with the first terminal device or installed in the first terminal device. The communication device can implement the functions performed by the first terminal device in the above aspects or possible designs, and the functions may be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. In one design, the device may include a module corresponding to the method / operation / step / action described in the seventh aspect, which may be a hardware circuit, software, or a combination of a hardware circuit and software. In one design, the communication device may include: a receiving unit and a processing unit.

[0077] The receiving unit is used to receive DCI from the network device; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule the physical data channel, the DCI is used to indicate the BWP, and the BWP is used to transmit the physical data channel.

[0078] The processing unit is used to schedule a physical data channel according to the DCI.

[0079] Among them, the specific implementation method of the communication device can refer to the behavior function of the first terminal device in the control information transmission method provided in the seventh aspect or any possible design of the seventh aspect, and will not be repeated here. Therefore, the provided communication device can achieve the same beneficial effects as the seventh aspect or any possible design of the seventh aspect.

[0080] In the ninth aspect, a communication device is provided, which may be a first terminal device or other device capable of implementing the method of the second aspect. The other device may be a chip or a system on chip in the first terminal device. The other device can be used in combination with the first terminal device or installed in the first terminal device. The communication device can implement the functions performed by the first terminal device in the above aspects or possible designs, and the functions can be implemented by hardware. In one possible design, the communication device may include: a processor and a communication interface, and the processor may be used to support the communication device to implement the functions involved in the above seventh aspect or any possible design of the seventh aspect, for example: the processor is used to receive DCI from a network device through a communication interface; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, the DCI is used to indicate a BWP, and the BWP is used to transmit a physical data channel; and the physical data channel is scheduled according to the DCI. In another possible design, the communication device may also include a memory, and the memory is used to store computer instructions and / or data. When the processor executes the computer instructions stored in the memory, the communication device executes the method described in the above seventh aspect or any possible design of the seventh aspect.

[0081] In a tenth aspect, a computer-readable storage medium is provided, in which instructions are stored. When the computer-readable storage medium is run on a computer, the computer can execute the method described in the seventh aspect or any possible design of the above aspects.

[0082] In the eleventh aspect, a computer program product comprising instructions is provided. The computer program product may include program instructions. When the computer program product runs on a computer, the computer can execute the method described in the seventh aspect or any possible design of the above aspects.

[0083] In the twelfth aspect, a chip system is provided, which includes a processor and a communication interface. The chip system can be used to implement the function performed by the first terminal device in the seventh aspect or any possible design of the seventh aspect, for example, the processor is used to receive DCI from the network device through the communication interface; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule physical data channels, the DCI is used to indicate the BWP, and the BWP is used to transmit physical data channels; and the physical data channels are scheduled according to the DCI. In one possible design, the chip system also includes a memory, and the memory is used to store program instructions and / or data. When the chip system is running, the processor executes the program instructions stored in the memory, so that the chip system executes the method described in the seventh aspect or any possible design of the seventh aspect. The chip system can be composed of chips, or it can include chips and other discrete devices, without limitation.

[0084] In the thirteenth aspect, an embodiment of the present application also provides a communication system, which includes a communication device as described in any one of the second to third aspects and a communication device as described in any one of the eighth to ninth aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] Figure 1a A flowchart of a terminal device blind detection DCI provided in an embodiment of the present application;

[0086] Figure 1 A schematic diagram of the composition of a communication system provided in an embodiment of the present application;

[0087] Figure 2 A schematic diagram of a communication device provided in an embodiment of the present application;

[0088] Figure 3 A flowchart of a BWP switching method provided in an embodiment of the present application;

[0089] Figure 4 A schematic diagram of the composition of a communication device 40 provided in an embodiment of the present application;

[0090] Figure 5 A schematic diagram of the composition of a communication device 50 provided in an embodiment of the present application;

[0091] Figure 6 A schematic diagram of the composition of a communication system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0092] Before describing the embodiments of the present application, the technical terms involved in the embodiments of the present application are described.

[0093] BWP: bandwidth part (BWP) is a continuous frequency domain resource (or can be described as frequency resource, frequency domain frequency resource, etc.) configured by the network device to the terminal device, which can realize flexible transmission bandwidth configuration between the network device and the terminal device. Through BWP, the terminal device does not need to know the actual transmission bandwidth of the network device (such as carrier bandwidth), but only needs to be able to support the BWP bandwidth configured for itself.

[0094] Specifically, each BWP configured by the network device for the terminal device is composed of continuous resource blocks (RB) in the frequency domain, and one RB includes 12 subcarriers. On a carrier, the network device can configure up to 4 BWPs for the terminal device. The transmission bandwidth included in each BWP is not greater than the bandwidth capability of the terminal device. Generally speaking, the data transmission between the network device and the terminal device can be dynamically adjusted within the frequency domain resource range corresponding to the configured BWP, and the frequency domain resources corresponding to each data transmission of the terminal device can only be within the frequency domain resource range corresponding to a BWP, and this BWP is the activated BWP. It should be noted that in the present application, the transmission bandwidth of the BWP may also be greater than the bandwidth capability of the terminal device. The difference between an activated BWP and a configured but inactivated BWP may include at least one of the following distinguishing features:

[0095] Difference (1): On a configured but not activated BWP, the terminal device does not expect to receive a physical downlink data channel and / or a physical downlink data signal.

[0096] The physical downlink data channel may be a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH). The physical downlink data signal may be a channel state information reference signal (CSI-RS). If the CSI-RS is used for radio resource management (RRM), the terminal device may use the CSI-RS to perform RRM measurements on a configured but unactivated BWP.

[0097] Difference (2): On a configured but unactivated BWP, the terminal device does not expect to send a physical uplink data channel and / or a physical uplink data signal.

[0098] The physical uplink data channel may be a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH). The physical uplink data signal may be a sounding reference signal (SRS).

[0099] In addition, among multiple BWPs configured for one terminal device, frequency domain resources included in different BWPs may or may not overlap, and the BWPs configured for different terminal devices may or may not be the same.

[0100] By configuring BWP, terminal devices can achieve data transmission within a larger bandwidth. As mentioned earlier, up to 4 BWPs can be configured for a terminal device within one carrier. Therefore, BWP reconfiguration can be achieved through, for example, radio resource control (RRC) signaling, thereby enabling terminal devices to transmit data with network devices within different BWPs.

[0101] Furthermore, dynamic switching of BWP can be achieved through downlink control information (DCI), thereby dynamically enabling terminal devices and network devices to transmit within different data transmission bandwidths, so that terminal devices can obtain frequency domain selective scheduling gain and ensure data transmission efficiency.

[0102] DCI: can include BWP switching indication information. The network device can flexibly switch the BWP used for data transmission according to the data transmission requirements, and carry the BWP switching indication information in the control field of DCI to the terminal device. The terminal device detects the received DCI, determines the switched BWP, and uses the switched BWP to transmit data with the network device, thereby reducing the cost of the terminal device while improving the data transmission efficiency.

[0103] In a possible implementation, the network device may send a radio resource control (RRC) signaling including the number of BWPs and specific information of each BWP configured for the terminal device to the terminal device in advance. When performing data transmission, the network device may flexibly switch the BWP used for data transmission according to the data transmission requirements, and carry the indication information including the BWP switching in the control field of the DCI to the terminal device. The terminal device determines the switched BWP by detecting the received DCI, and uses the switched BWP to perform data transmission with the network device, thereby reducing the cost of the terminal device while improving the data transmission efficiency.

[0104] Among them, the number of bits of the control field including the indication information for indicating the switched BWP can be configured according to the number of BWPs in the RRC signaling. For example, when the RRC signaling includes 4 BWPs, the number of bits of the control field in the DCI can be 2 bits. When the terminal device detects the DCI, it can determine the number of bits of the control field according to the number of BWPs in the RRC signaling, determine the specific value of the control field in the DCI according to the number of bits of the control field, determine the switched BWP indicated by the DCI according to the specific value, and use the switched BWP for data transmission.

[0105] In addition, since the parameter information of RRC signaling is carried by PDSCH, and PDSCH transmission is scheduled by DCI carried in PDCCH. In order to simplify the implementation of terminal equipment and avoid the impact of RRC signaling on DCI detection, the terminal equipment also needs to detect DCI that does not include BWP switching. And when the network equipment uses the RRC reconfiguration information to transmit data with the terminal equipment after sending the RRC reconfiguration information and before confirming that the terminal equipment has received the RRC reconfiguration information, the reliability of the data transmission cannot be guaranteed. The terminal equipment can detect the DCI that does not include BWP switching to achieve reliable and effective data transmission between the network equipment and the terminal equipment.

[0106] Therefore, the terminal device can detect DCIs of different formats, obtain DCI indicating BWP switching, and implement BWP switching according to the instructions of the obtained DCI. Figure 1a The process of blindly detecting DCI for terminal devices, such as Figure 1a As shown, the process includes:

[0107] Step 101: Determine candidate PDCCHs according to CORESET and search space configuration.

[0108] Among them, the terminal equipment can determine the frequency band occupied by the PDCCH in the frequency domain and the number of OFDM symbols occupied in the time domain according to the CORESET, and determine the PDCCH starting orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol number and PDCCH monitoring period according to the search space configuration, that is, determine the candidate time-frequency position of the PDCCH according to the CORESET and search space configuration.

[0109] Step 102: Receive DCI.

[0110] Step 103: Decode each candidate PDCCH.

[0111] Specifically, the terminal device may use a decoder to perform decoding at the candidate time-frequency position of the PDCCH, wherein the output length of the decoder is the length of the DCI.

[0112] If the cyclic redundancy check (CRC) of the decoded information bits is the same as the CRC carried by the PDCCH, the decoding is considered successful, where the CRC may include a radio network temporary identity (RNTI).

[0113] Before the network device sends the DCI to the terminal device, the DCI can be scrambled using the system information radio network temporary identifier (SI-RNTI), the paging radio network temporary identifier (P-RNTI), etc., and the terminal device can also perform corresponding descrambling on the DCI.

[0114] Step 104: parse the decoded DCI to determine the information indicated by each field.

[0115] Specifically, the terminal device can determine the BWP according to the field in the DCI used to indicate the BWP switching and implement the switching.

[0116] In the above-mentioned blind detection method, the terminal device needs to detect both the DCI including BWP switching and the DCI not including BWP switching. Since the bit size of the DCI including BWP switching is different from the bit size of the DCI not including BWP switching, the terminal device needs to detect at least two types of DCI with different bit sizes to realize BWP switching and data transmission. Generally speaking, the DCI format corresponding to different DCI bit sizes is different. Since the terminal device is not sure what type of DCI the network device will send, the terminal device needs to detect all possible DCI formats. The more DCI formats detected by the terminal device (or the more DCIs with different DCI bit sizes detected by the terminal device), the greater the power consumption. Therefore, in the NR system, although the terminal device can realize BWP switching, due to the large number of detected DCI formats and the high detection complexity, the terminal device consumes a large amount of power, which is not conducive to power saving of the terminal device and the large-scale application of the above-mentioned services.

[0117] To solve this problem, an embodiment of the present application provides a control information transmission method, including: a network device sends a DCI with a fixed number of bits to a first terminal device; the DCI is used to schedule a physical data channel and is also used to indicate a BWP for transmitting a physical data channel. In the embodiment of the present application, the number of bits of the DCI sent by the network device to the first terminal device for indicating the BWP is fixed. When the first terminal device blindly detects the DCI sent by the network device, it can perform a blind detection through a detection device with the fixed number of bits. The DCI successfully detected is the DCI indicating the BWP. In this way, while ensuring data transmission efficiency, the number of blind detections of the DCI by the first terminal device can be reduced, the detection complexity can be reduced, and the power consumption of the first terminal device can be reduced, thereby achieving the purpose of power saving and facilitating large-scale application of services related to the first terminal device.

[0118] It should be noted that the terminal device described in the present application may be a legacy terminal device (high-capability terminal) or a reduced capability (REDCAP) terminal. The REDCAP terminal may also be referred to as a light terminal without limitation. Among them, the legacy terminal may be an enhanced mobile broadband (eMBB) terminal, a machine type communications (MTC) terminal, etc. The REDCAP terminal device is a terminal device with a lower configuration compared to the legacy terminal device, and the feature comparison between the two satisfies at least one of the following first to ninth items. Among them, at least one item may be one or more items, such as two, three or more items, which are not limited in the embodiments of the present application.

[0119] The first item: 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, and the maximum bandwidth supported by the REDCAP terminal is 20 MHz, 10 MHz, or 5 MHz.

[0120] The second item: The number of antennas of the high-capability terminal is greater than the number of antennas of the REDCAP terminal. The number of antennas can be the number of antennas set for the terminal, or the maximum number of antennas used for sending and / or receiving. For example: the high-capability terminal supports up to 4 antennas for receiving and 2 antennas for transmitting, and the REDCAP terminal supports up to 2 antennas for receiving and 1 antenna for transmitting. Alternatively, even if the number of antennas of the high-capability terminal is equal to the number of antennas of the NR REDCAP terminal, the capabilities in antenna selective transmission are different. For example, both the high-capability terminal and the low-capability terminal support 2-antenna transmission, but the high-capability terminal supports antenna selective transmission, while the low-capability terminal does not support antenna selective transmission. Taking single-antenna port data transmission as an example, the high-capability terminal can realize the switching of single-antenna port data transmission on 2 transmitting antennas, and the data transmission can obtain spatial diversity gain; while the single-antenna port data transmission of the low-capability terminal can only be sent simultaneously on 2 transmitting antennas, which is equivalent to the transmission performance of 1 transmitting antenna.

[0121] Item 3: The maximum transmit power supported by the high-capability terminal is greater than the maximum transmit power supported by the REDCAP terminal. For example, the maximum transmit power supported by the high-capability terminal is 23 decibel-milliwatt (dBm) or 26dBm, and the maximum transmit power supported by the REDCAP terminal is a value between 4dBm and 20dBm.

[0122] Item 4: High-capability terminals support carrier aggregation (CA), while REDCAP terminals do not support carrier aggregation.

[0123] 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, the high-capability terminal supports a maximum of 32 carriers or 5 carrier aggregation, and the REDCAP terminal supports a maximum of 2 carrier aggregation.

[0124] Item 6: High-capability terminals and REDCAP terminals are introduced in different protocol versions. For example, in the NR protocol, high-capability terminals are terminals introduced in Release (R) 15 of the protocol, and REDCAP terminals are terminals introduced in R17 of the protocol.

[0125] Item 7: The duplex capabilities of high-capability terminals and REDCAP terminals are different. The duplex capabilities of high-capability terminals are stronger. For example, high-capability terminals support full-duplex frequency division duplex (FDD), that is, high-capability terminals support simultaneous reception and transmission when supporting FDD, and REDCAP terminals support half-duplex FDD, that is, REDCAP terminals do not support simultaneous reception and transmission when supporting FDD.

[0126] Item 8: The data processing capability of the high-capability terminal is stronger than that of the REDCAP terminal. The high-capability terminal can process more data in the same time, or the high-capability terminal processes the same data in a shorter time. For example, the time when the terminal receives the downlink data from the network device is recorded as T1, and after the terminal processes the downlink data, the time when the terminal sends feedback of the downlink data to the network device is recorded as T2. The delay (time difference) between T2 and T1 of the high-capability terminal is less than the delay between T2 and T1 of the REDCAP terminal. The feedback of the downlink data can be ACK or NACK feedback.

[0127] Item 9: The peak rate of data transmission of the high-capability terminal is greater than the peak rate of data transmission of the REDCAP terminal. The 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).

[0128] 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.

[0129] REDCAP terminals can be applied to various scenarios such as the Internet of Things, mMTC, or V2X. In one possible design, the REDCAP terminal is required to have lower power consumption than a high-capability terminal. The lower the power consumption of the REDCAP terminal, the longer its battery life and the better the user experience. In addition, the deployment environment of some REDCAP terminals (such as underground pipelines, suburbs, etc.) is relatively special, and it is not convenient to adjust the power supply system of the REDCAP terminal in this environment. In this case, reducing the power consumption of REDCAP terminals can simplify the later maintenance of such terminals and improve user experience. Therefore, how to reduce the power consumption of REDCAP terminals is an issue worthy of study.

[0130] 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 supporting 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.

[0131] The implementation of the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0132] The control information transmission method provided in the embodiment of the present application can be used in any wireless communication system, which can be a third generation partnership project (3GPP) wireless communication system, for example, a long term evolution (LTE) system, or a fifth generation (5G) wireless mobile communication system, a new radio (NR) system, an NR V2X system and other next generation communication systems, or a non-3GPP communication system without limitation.

[0133] The control information transmission method provided in the embodiment of the present application can be applied to various communication scenarios, for example, it can be applied to one or more of the following communication scenarios: enhanced mobile broadband (eMBB), ultra reliable low latency communication (URLLC), machine type communication (MTC), massive machine type communication (mMTC), device to device (D2D), vehicle to everything (V2X), vehicle to vehicle (V2V), and Internet of things (IoT). Figure 1 Taking this as an example, the control information transmission method provided in an embodiment of the present application is described.

[0134] Figure 1 A schematic diagram of a communication system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the communication system may include at least one communication device, and the communication devices may use air interface resources for wireless communication. Among them, the communication device may include a network device and a terminal device, and the network device may also be referred to as a network side device. The air interface resources may include at least one of time domain resources, frequency domain resources, code resources, and space resources. In the embodiment of the present application, at least one may also be described as one or more, and a plurality may be two, three, four or more, which is not limited in the present application.

[0135] The terminal device involved in the embodiments of the present application can also be referred to as a terminal, which can be a device with a wireless transceiver function, which can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on the water (such as a ship, etc.); it can also be deployed in the air (for example, on an airplane, a balloon, and a satellite, etc.). The terminal device can be a user equipment (UE), wherein the UE includes a handheld device, a vehicle-mounted device, a wearable device, or a computing device with a wireless communication function. Exemplarily, the UE can be a mobile phone, a tablet computer, or a computer with a wireless transceiver function. The terminal device can also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, a wireless terminal in a smart home, and the like. In the embodiments of the present application, the device for realizing the function of the terminal can be a terminal; it can also be a device that can support the terminal to realize the function, such as a chip system, which can be installed in the terminal. 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 is a terminal, and the terminal is a UE as an example to describe the technical solution provided in the embodiment of the present application.

[0136] The network equipment involved in the embodiments of the present application includes a base station (BS), which may be a device deployed in a wireless access network that can communicate wirelessly with a terminal. Among them, the base station may have various forms, such as a macro base station, a micro base station, a relay station, and an access point. Exemplarily, the base station involved in the embodiments of the present application may be a base station in 5G or a base station in LTE, wherein the base station in 5G may also be referred to as a transmission reception point (TRP) or gNB. In the embodiments of the present application, the device for implementing the function of the network device may be a network device; it may also be a device that can support the network device to implement the function, such as a chip system, which may be installed in the network device. In the technical solution provided in the embodiments of the present application, the device for implementing the function of the network device is a network device, and the network device is a base station as an example to describe the technical solution provided in the embodiments of the present application.

[0137] When implementing it specifically, Figure 1 As shown, for example, network equipment and terminal equipment can use Figure 2 The structure shown, or including Figure 2 Parts shown. Figure 2The present invention provides a schematic diagram of the composition of a communication device 200, which can be a network device or a chip or system on chip in a network device; or a terminal device or a chip or system on chip in a terminal device. Figure 2 As shown, the communication device 200 includes a processor 201 , a transceiver 202 and a communication line 203 .

[0138] Furthermore, the communication device 200 may further include a memory 204. The processor 201, the memory 204 and the transceiver 202 may be connected via a communication line 203.

[0139] The processor 201 is a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 201 may also be other devices with processing functions, such as circuits, devices, or software modules, without limitation.

[0140] The transceiver 202 is used to communicate with other devices or other communication networks. The other communication networks may be Ethernet, radio access network (RAN), wireless local area network (WLAN), etc. The transceiver 202 may be a module, a circuit, a transceiver or any device capable of achieving communication.

[0141] The communication line 203 is used to transmit information between the components included in the communication device 200.

[0142] The memory 204 is used to store instructions, where the instructions may be computer programs.

[0143] The memory 204 may be a read-only memory (ROM) or other types of static storage devices that can store static information and / or instructions, or a random access memory (RAM) or other types of dynamic storage devices that can store information and / or instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

[0144] It should be noted that the memory 204 can exist independently of the processor 201, or can be integrated with the processor 201. The memory 204 can be used to store instructions or program codes or some data, etc. The memory 204 can be located in the communication device 200, or can be located outside the communication device 200, without limitation. The processor 201 is used to execute the instructions stored in the memory 204 to implement the control information transmission method provided in the following embodiments of the present application.

[0145] In one example, the processor 201 may include one or more CPUs, such as Figure 2 CPU0 and CPU1 in.

[0146] As an optional implementation, the communication device 200 includes multiple processors, for example, Figure 2 In addition to the processor 201, a processor 207 may also be included.

[0147] As an optional implementation, the communication device 200 further includes an output device 205 and an input device 206. Exemplarily, the input device 206 is a device such as a keyboard, a mouse, a microphone or a joystick, and the output device 205 is a device such as a display screen and a speaker.

[0148] It should be noted that the communication device 200 can be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system or a Figure 2 In addition, Figure 2 The structure shown in the figure does not constitute a limitation on the communication device, except Figure 2 In addition to the components shown, the communication device may include more or fewer components than shown, or combine certain components, or arrange the components differently.

[0149] 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.

[0150] The technical solution provided in the embodiment of the present application can be applied to wireless communication between network equipment and terminal equipment. In the embodiment of the present application, the term "wireless communication" can also be referred to as "communication", and the term "communication" can also be described as "data transmission", "information transmission" or "transmission". The technical solution can be used for wireless communication between a scheduling entity and a subordinate entity, and those skilled in the art can use the technical solution provided in the embodiment of the present application for wireless communication between other scheduling entities and subordinate entities.

[0151] In addition, the actions, terms, etc. involved in the various embodiments of the present application can refer to each other without limitation. The message name or parameter name in the message exchanged between the various devices in the embodiments of the present application is only an example, and other names can also be used in the specific implementation without limitation.

[0152] Combine the following Figure 1 The communication system shown in the figure describes the control information transmission method provided in the embodiment of the present application, wherein the network device in the following embodiment is Figure 1 Any network device in the communication system shown, the first terminal device is Figure 1 Any terminal device in the communication system shown in the figure, the network device and the first terminal device described in the following embodiments may have Figure 2 Parts shown.

[0153] Figure 3 A flow chart of a control information transmission method provided in an embodiment of the present application, such as Figure 3 As shown, the method may include:

[0154] Step 301: The network device sends a DCI to the first terminal device.

[0155] The number of bits of the DCI may be a fixed number of bits, and the DCI may be used to schedule a physical data channel. The DCI may also be used to indicate a BWP, such as: the fixed number of bits of the DCI may carry bits for indicating a BWP, and the BWP may be used to transmit a physical data channel. In the present application, the number of bits for indicating a BWP may be determined based on the maximum number of BWPs pre-configured for the first terminal device. For example, if the maximum number of configured BWPs is M, the number of bits for indicating a BWP in the DCI may be ceil(log 2M); wherein ceil(X) represents an integer greater than X and closest to X. The BWP indicated by the DCI may be any of the multiple BWPs preconfigured by the first terminal device. For example, terminal 1 is preconfigured with four BWPs: BWP0 to BWP3. The number of bits used to indicate the BWP may be two bits. When terminal 1 needs to activate BWP0 for the first time and transmits a physical data channel on BWP0, the DCI may carry 00 to indicate that the BWP is BWP0; or, when BWP1 needs to be activated and terminal 1 is instructed to switch from BWP0 to BWP1, the DCI may carry 01 to indicate that the BWP is BWP1.

[0156] In the present application, the physical data channel may be a physical downlink control channel (PDCCH), an enhanced PDCCH (EPDCCH), a machine type communication MTC PDCCH (MPDCCH), a narrowband PDCCH (NPDCCH), or other channels newly defined in future communication protocols that have the same or similar functions as the downlink control channel, etc., without limitation.

[0157] Exemplarily, during data transmission with the first terminal device, the network device can flexibly switch the BWP used for data transmission according to data transmission requirements, generate a DCI with a fixed number of bits for indicating the BWP, and send it to the first terminal device, so that the first terminal device completes the switching of the BWP according to the DCI with a fixed number of bits.

[0158] In the present application, the length of the DCI indicating BWP may be the same as the length of the DCI specified by the communication protocol. For example, the number of bits in the DCI specified by the protocol may be determined as the number of bits of the DCI used to indicate BWP. Specifically, the method for determining the fixed number of bits of DCI may refer to the following methods 1 to 4. In addition to the bits used to indicate BWP, the DCI may also include other bits shown in Table 1 below.

[0159] A possible design is that in an embodiment of the present application, during communication between the network device and the first terminal device, the fixed number of bits of the DCI used to indicate the BWP remains unchanged.

[0160] For example, during the communication between the network device and the first terminal device, the number of bits of the DCI used to indicate the BWP may always be B1, so that the terminal device can determine the BWP indicated by the network device by detecting the DCI with the bit number of B1.

[0161] Another possible design is that in the embodiment of the present application, during the communication between the network device and the first terminal device, the fixed number of bits of the DCI used to indicate the BWP remains unchanged for a period of time, and the number of bits of the DCI indicating the BWP is different in different time periods.

[0162] For example, during the communication between the network device and the first terminal device, the number of bits of the DCI used to indicate the BWP may be B1 in the T1 time period and B2 in the T2 time period.

[0163] Specifically, the network device may receive the information "the number of bits of DCI used to indicate BWP is B1" before the T1 time period or at the initial moment of the T1 time period. The network device may also carry the information "the number of bits of DCI used to indicate BWP in the T1 time period is B1" in the content carried by the physical data channel scheduled by the DCI and send it to the first terminal device, so that the first terminal device determines that the number of bits of DCI used to indicate BWP in the T1 time period is B1 based on the information.

[0164] The network device can also send the information "the number of DCI bits used to indicate BWP in the T2 time period is B2" to the first terminal device in the content carried by the physical data channel scheduled by the DCI, so that the first terminal device determines that the number of DCI bits used to indicate BWP in the T2 time period is B2 based on the indication information.

[0165] Step 302: The first terminal device receives DCI and schedules a physical data channel according to the DCI.

[0166] Optionally, the first terminal device detects DCI in USS (UE-specific search space, USS), and only the DCI format (DCI format) with the DCI bit size is configured in the USS; in other words, the first terminal device only detects the DCI format with the DCI size in the USS; in other words, within the USS configured by the network device for the first terminal device, the network device only configures the DCI format with the DCI bit size for the terminal device.

[0167] It should be noted that the USS here is one USS or multiple USSs (including all configured USSs) in at least one USS configured by the network device for the terminal device, and there may be one or more DCI formats with the DCI bit size, and different DCI formats can be distinguished by different identifiers, for example, by different RNTIs. One of the DCI formats is a DCI format including the DCI indicated in the embodiment of the present application.

[0168] Since only the DCI format with the DCI bit size indicated in the embodiment of the present application is configured in the USS, the first terminal device can detect only one DCI format of the DCI size in the USS. Compared with the prior art, the first terminal device detects at least two DCI formats of the DCI size in the USS. The technical solution proposed in the embodiment of the present application can reduce the number of blind detections of the PDCCH by the first terminal device. In addition, the DCI proposed in the embodiment of the present application can be used to indicate BWP, so as to realize BWP switching and ensure the frequency domain scheduling gain and reliability of data transmission.

[0169] Optionally, the first terminal device only detects the DCI format with the DCI bit size in the USS and common search space (CSS), or in other words, within the USS and CSS configured by the network device for the first terminal device, the network device only configures the DCI format with the DCI bit size for the first terminal device, wherein the USS is one USS or multiple USSs (including all configured USSs) in at least one USS configured by the network device for the first terminal device, and the CSS is one CSS or multiple CSSs (including all configured CSSs) in at least one CSS configured by the network device for the first terminal device. There may be one or more DCI formats with the DCI bit size, and different DCI formats may be distinguished by different identifiers, for example, by different RNTIs. One of the DCI formats is a DCI format that includes the DCI specified in the embodiments of the present application. For the first terminal device, when only the DCI format with the DCI bit size is configured in all configured USSs and all CSSs, the first terminal device only needs to detect DCI format of one DCI size at most. Compared with the prior art that the terminal device detects DCI formats of four DCI sizes in the CSS and USS at most, the technical solution proposed in the embodiment of the present application can reduce the number of blind detections of PDCCH by the first terminal device, thereby saving power consumption.

[0170] exist Figure 3 In the method shown, the network device or the first terminal device may determine the number of bits of the DCI in any one of the following ways 1 to 4:

[0171] Method 1: The number of DCI bits is predefined.

[0172] Specifically, the number of bits of the DCI used to indicate the BWP may be determined in a manner predefined by the standard, or the number of bits of the DCI used to indicate the BWP may be the same as the number of bits of the DCI specified in the protocol.

[0173] Among them, the DCI specified in the protocol can be DCI format1-0, DCI format1-1, DCI format1-2, DCIformat0-1, DCI format0-1, DCI format0-2.

[0174] For example, assuming that the communication protocol predetermines that the number of bits of the DCI used to indicate BWP is B1, when the network device sends the DCI used to indicate BWP to the first terminal device, the network device sets the number of bits of the DCI to B1.

[0175] Alternatively, assuming that the number of bits of the DCI used to indicate the BWP is the same as the number of bits of the DCI format 1-0, if the number of bits of the DCI format 1-0 is B2, then the number of bits of the DCI used to indicate the BWP is determined to be B2.

[0176] Method 2: The number of DCI bits is determined based on the maximum bandwidth supported by the first terminal device.

[0177] The first terminal device can directly determine the number of DCI bits based on the maximum bandwidth (or bandwidth capability) it supports. The maximum bandwidth supported by the first terminal device can be understood as the maximum data transmission bandwidth that can be used simultaneously when the first terminal device performs data transmission with the network device. For example, the maximum bandwidth of the REDCAP terminal can be 5MHz, 10MHz, or 20MHz.

[0178] For example, the higher the bandwidth capability supported by the terminal device, the more bits of the DCI can be set, and the lower the bandwidth capability supported by the terminal device, the fewer bits of the DCI can be set.

[0179] Mode 3: The number of bits of DCI is determined according to the bandwidth of control resource set #0 (control resource set, CORESET) #0.

[0180] Among them, CORESET#0 can be used to search for DCI for scheduling system information block (SIB). The bandwidth of CORESET#0 can be represented by the number of resource blocks (RB). When the bandwidth of CORESET#0 is different, the number of bits of DCI can be different.

[0181] Exemplarily, the determination of the number of DCI bits according to the bandwidth of CORESET#0 may include: there is a corresponding relationship between the number of DCI bits and the number of RBs of CORESET#0, or the number of DCI bits and the number of RBs of CORESET#0 satisfy a preset calculation rule, such as: the number of RBs of CORESET#0 can be input into a certain calculation model to obtain the number of DCI bits, etc.

[0182] For example, taking the correspondence between the number of DCI bits and the number of RBs of CORESET#0 as an example, the bandwidth of CORESET#0 may be 24 resource blocks (RBs), 48 RBs, or 96 RBs. When the bandwidth of CORESET#0 is 24 RBs, the number of DCI bits may be B1; when the bandwidth of CORESET#0 is 48 RBs, the number of DCI bits may be B2; when the bandwidth of CORESET#0 is 96 RBs, the number of DCI bits may be B3.

[0183] It should be noted that, in addition to method three, the number of DCI bits may also be related to other configuration information of the initial access, such as: it may be related to the information of the synchronization signal block (SSB), the SSB information includes: the index of the SSB, the configuration information of the master information block (MIB) carried by the physical broadcast channel (PBCH) in the SSB, the configuration information of the common search space CSS indicated by the PBCH, etc.

[0184] Mode 4: The number of bits of the DCI is the same as the number of bits of the DCI used for scheduling public information transmission.

[0185] The public information may be information broadcasted by the network device to the first terminal device before step 301. Specifically, the public information may include SIB, paging message, and random access response (RAR) broadcasted by the network device. The SIB may be a system information block type 1 (SIB1) for random access or other SIBs, etc., without limitation.

[0186] Furthermore, in method four, in order to distinguish whether the DCI detected using the same number of bits is the DCI indicating BWP or the DCI used to schedule public information transmission, the radio network temporary identity (RNTI) used to scramble the DCI for scheduling public information transmission is different from the RNTI used to scramble the DCI indicating BWP. When the public information is a SIB broadcast by a network device, the DCI used to scramble the scheduling public information transmission is SI-RNTI. When the public information is a paging message broadcast by a network device, the DCI used to scramble the scheduling public information transmission is P-RNTI. When the public information is a random access response broadcast by a network device, the DCI used to scramble the scheduling public information transmission is a random access radio network temporary identifier (RA-RNTI).

[0187] Thus, in method four, the bit size of the DCI used to indicate BWP is kept consistent with the bit size of the DCI used to schedule public information. Thus, when the first terminal device blindly detects the DCI indicating BWP sent by the network device, the first terminal device can use the bit size of the DCI for scheduling public information to blindly detect the DCI sent by the network device. Furthermore, the DCI obtained by blind detection is de-scrambled using the RNTI corresponding to the DCI for scheduling public information and the RNTI corresponding to the DCI indicating BWP to obtain the DCI indicating BWP. Therefore, regardless of whether the first terminal device detects the DCI for scheduling information or the DCI indicating BWP, it can use the same decoder for detection, and then use different RNTIs to distinguish between the two different DCIs, thereby reducing the complexity and power consumption of DCI detection by the first terminal device.

[0188] In an embodiment of the present application, the DCI used to indicate BWP described in any of the above methods 1 to 4 may have any of the six DCI formats specified in the protocol: DCI format 1-0, DCI format 1-1, DCI format 1-2, DCI format 0-1, DCI format 0-1, DCI format 0-2, or other DCI formats defined in future protocols, without limitation. The fields included in the DCI indicating BWP are the same in length and position as the fields included in the DCI specified in the protocol, and part or all of the bits of certain fields in the DCI specified in the protocol are used as indicating BWP to obtain the DCI indicating BWP, that is, the content indicated by a field at a certain position in the DCI specified in the protocol may be the same as or different from the content indicated by the field at the same position in the DCI indicating BWP.

[0189] Exemplarily, part or all of the bits of the following one or more fields in the DCI (or DCI format) specified in the protocol can be used as bits indicating BWP: downlink assignment index (DAI) field, physical uplink control channel resource indicator (PUCCH resource indicator) field, physical downlink shared channel to hybrid automatic repeat request feedback timing indicator (PDSCH-to-HARQ feedback timing indicator) field, frequency domain resource allocation field, etc.

[0190] In addition to the above fields, part or all of the bits of other fields in the DCI (or DCI format) specified in the protocol may also be used as bits indicating BWP without limitation.

[0191] Taking the example that the network device determines, according to any one of the above-mentioned methods 1 to 4, that the number of bits of the DCI used to indicate BWP and the position of each field are the same as the number of bits and the position of each field of DCI format1-0 scrambled by the cell radio network temporary identifier (cell-radio network temporary identifier, C-RNTI), the DCI used to indicate BWP in an embodiment of the present application is described in detail.

[0192] As shown in Table 1, DCI format1-0 may include an identifier for DCI formats field, a frequency domain resource assignment field, a time domain resource assignment field, a virtual resource block to physical resource block mapping (VRB-to-PRBmapping) field, TB1: modulation and coding scheme (MCS) field, TB1: new data indicator (NDI) field, TB1: redundancy version (RV) field, HPN field, DAI field, TPC command for scheduled PUCCH field, PUCCH resource indication field, and a timing indication field between PDSCH and HARQ feedback.

[0193] Specifically, when the bandwidth of CORESET#0 is 24 RBs, the number of bits of DCI format 1_0 is 36 bits, when the bandwidth of CORESET#0 is 48 RBs, the number of bits of DCI format 1_0 is 38 bits, and when the bandwidth of CORESET#0 is 96 RBs, the number of bits of DCI format 1_0 is 40 bits.

[0194] Table 1 DCI format 1_0 (C-RNTI)

[0195]

[0196]

[0197] Example (1): Part or all of the bits in the DAI field in DCI format 1-0 are used to indicate BWP, and the length, position and specific indication content of other fields remain unchanged to obtain a DCI indicating BWP.

[0198] Since the first terminal device may not support carrier aggregation capability or the supported carrier aggregation capability is limited, that is, the maximum number of HARQ bits that the first terminal device needs to feedback is limited, the codebook size of the HARQ feedback can be directly determined according to the static codebook method, without using the DAI field in DCI format1-0 to implement dynamic HARQ feedback, so as to reduce the HARQ feedback overhead. HARQ feedback may include HARQ-ACK and HARQ-NACK. Therefore, when the static codebook method is used by default to determine the codebook size of the HARQ feedback, the DAI field in DCI format1-0 is meaningless, and the DAI field can be used to indicate BWP.

[0199] When all bits in the DAI field in DCI format1-0 are used to indicate BWP to obtain DCI indicating BWP, the bits used to indicate BWP in the DCI indicating BWP can still be called the DAI field, but the meaning indicated by the DAI field is different from the meaning indicated by DCI format1-0, or the bits used to indicate BWP in the DCI indicating BWP can also be named other fields, such as: named as the BWP indication field, etc., without limitation.

[0200] For example, taking the DAI field in DCI format 1-0 as an example, the two bits occupied by the DAI field are used to indicate BWP in the embodiment of the present application, but the bit field where the two bits are located is still called the DAI field. Alternatively, the bit field where the two bits are located can be called the BWP indication field, that is, the DCI does not include the DAI field.

[0201] Optionally, the bit size of the HARQ-ACK information fed back by the first terminal device (referred to as the HARQ-ACK codebook size) is set to be fixed. In this way, when the first terminal device needs to feed back the uplink HARQ-ACK information corresponding to the downlink data transmission included in the M downlink time slots before the uplink time at a certain uplink moment, the HARQ-ACK codebook size can be determined by a static codebook, that is, regardless of whether the M downlink time slots include downlink data transmission, the first terminal device determines the HARQ-ACK codebook size according to the number of HARQ-ACK bits that need to be fed back corresponding to the M downlink time slots, that is, the HARQ-ACK codebook size = M*the number of HARQ-ACK bits that need to be fed back corresponding to the downlink time slot.

[0202] For example, if the number of bits of HARQ-ACK information that needs to be fed back corresponding to one downlink time slot is 2 bits, then the HARQ-ACK codebook size determined by using a static codebook is 1*2 bits.

[0203] When some bits in the DAI field in DCI format1-0 are used to indicate BWP, when DCI indicating BWP is obtained, the DAI field is still called the DAI field in the DCI indicating BWP, but the meaning indicated by the DAI field is different from the meaning indicated by DCIformat1-0, such as: the DCI indicating BWP includes a DAI field, the DAI field includes M1 bits, M2 bits of the M1 bits are used to indicate BWP, and M1-M2 bits are used to indicate other information, such as: indicating the number of downlink physical data channels transmitted in the downlink physical data channel transmission window for the first terminal device, that is, it can be understood that M1-M2 bits are actually used for the function of the DAI field.

[0204] Alternatively, when some bits in the DAI field in DCI format1-0 are used to indicate BWP, some bits in the DAI field used to indicate BWP can be named as other fields, such as: named as BWP indication field, etc., and other bits in the DAI field can still be called DAI field, etc., without limitation. For example: the DCI used to indicate BWP includes a DAI field and a BWP indication field, the DAI field and the BWP indication field have a total of M1 bits, the DAI field includes M1-M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate BWP, the DAI field is used to indicate the number of downlink physical data channels transmitted in the downlink physical data channel transmission window for the first terminal device, M1 is the number of bits used when sending the DAI field to the second terminal device, or M1 is the number of bits of the DAI field in DCI format1-0. For example, the first terminal device can be understood as a REDCAP terminal, and the second terminal device can be understood as a non-REDCAP terminal device.

[0205] For example, taking the example that the DAI field in DCI format1-0 occupies 2 bits, 1 bit of the 2 bits can be used to indicate BWP, and the other bit is used to indicate the number of downlink physical data channels transmitted in the downlink physical data channel transmission window. However, the bit domain where the 2 bits are located is still called the DAI field, or the 1 bit used to indicate BWP is called the BWP indication field, and the other bit is called the DAI field. Alternatively, for the second terminal device, the DAI field in the DCI including the BWP indication occupies 2 bits, and all of the 2 bits are used to indicate the number of downlink physical data channels transmitted in the downlink physical data channel transmission window, but for the first terminal device, the DAI field in the DCI including the BWP indication may only occupy 1 bit, and the other 1 bit is used to indicate BWP.

[0206] In the above example (1), by using all or part of the bits in the DAI field in DCI format1-0 to indicate BWP, while reducing the impact on the feedback codebook of the first terminal device, it is also possible to ensure that the DCI is aligned with the DCI bit number for scheduling public information transmission, thereby reducing the detection complexity and thus reducing the power consumption of the first terminal device.

[0207] Example (2): Part or all of the bits in the PUCCH resource indication field in DCI format 1-0 are used to indicate BWP, and the length, position and specific indication content of other fields remain unchanged to obtain a DCI indicating BWP.

[0208] Since the first terminal devices, especially the first terminal devices mainly used for uplink services, such as terminal devices used in industrial wireless sensor networks (IWSN), terminal devices used for video surveillance, and smart wearable devices such as smart watches, are mostly mainly used for uplink services, the received downlink data does not account for a major part. Therefore, the number of HARQ-ACK information bits fed back for the downlink data is also relatively stable, and the channel state information (CSI) used to characterize the downlink channel transmission quality does not need to be fed back too frequently. Therefore, HARQ-ACK, CSI and other information can be fed back through limited PUCCH resources.

[0209] When all bits in the PUCCH resource indication field in DCI format 1-0 are used to indicate BWP to obtain DCI indicating BWP, the bits used to indicate BWP in the DCI indicating BWP can still be called the PUCCH resource indication field, except that the meaning indicated by the PUCCH resource indication field is different from the meaning indicated by DCI format 1-0. Alternatively, the bits used to indicate BWP in the DCI indicating BWP can also be named other fields, such as: named as the BWP indication field, etc., without restriction.

[0210] For example, taking the bit occupied by the PUCCH resource indication field in DCI format 1-0 as 3 bits, in the embodiment of the present application, all the 3 bits can be used to indicate the BWP, but the bit field where the 3 bits are located is still called the PUCCH resource indication field. Alternatively, the bit field where the 3 bits are located can be called the BWP indication field, that is, the PUCCH resource indication field is not included in the DCI.

[0211] Further, when all bits in the PUCCH resource indication field in DCI format 1-0 are used to indicate BWP, the network device may determine that the first terminal device determines that the PUCCH resource is predefined.

[0212] When some bits in the PUCCH resource indication field in DCI format1-0 are used to indicate BWP, when DCI indicating BWP is obtained, the PUCCH resource indication field is still called the PUCCH resource indication field in the DCI indicating BWP, but the meaning indicated by the PUCCH resource indication field is different from the meaning indicated by DCI format1-0, such as: the DCI indicating BWP includes a PUCCH resource indication field, the PUCCH resource indication field includes M3 bits, M2 bits of the M3 bits are used to indicate BWP, and M3-M2 bits are used to indicate other information, such as: indicating PUCCH resources for the first terminal device, wherein the PUCCH resources include at least one of the following: the time-frequency resources corresponding to the PUCCH, the PUCCH format (PUCCH format) used by the first terminal device to feedback HARQ-ACK information on the PUCCH time-frequency resources, whether the first terminal device uses intra-slot frequency hopping transmission when using the PUCCH resource to feedback HARQ-ACK, etc., without restriction. That is, it can be understood that the M3-M2 bits are actually used for the function of the PUCCH resource indication field.

[0213] Alternatively, when some bits in the PUCCH resource indication field in DCI format 1-0 are used to indicate BWP, some bits in the PUCCH resource indication field used to indicate BWP can be named as other fields, such as: named as BWP indication field, etc., and other bits in the PUCCH resource indication field can still be called PUCCH resource indication field, etc., without limitation. For example, the DCI used to indicate BWP includes a PUCCH resource indication field and a BWP indication field, the PUCCH resource indication field and the BWP indication field have a total of M3 bits, the PUCCH resource indication field includes M3-M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate BWP, the PUCCH resource indication field is used to indicate PUCCH resources for the first terminal device, M3 is the number of bits used when sending the PUCCH resource indication field to the second terminal device, or it can also be described as M3 is the number of bits of the PUCCH resource indication field in DCI format 1-0. For example, the first terminal device can be understood as a REDCAP terminal, and the second terminal device can be understood as a non-REDCAP terminal device.

[0214] For example, taking the example that the bits occupied by the PUCCH resource indication field in DCI format 1-0 are 3 bits, in the embodiment of the present application, 1 bit of the 3 bits can be used to indicate the BWP, and the other 2 bits can be used to indicate the PUCCH resource; or 2 bits of the 3 bits can be used to indicate the BWP, and the other 1 bit can be used to indicate the PUCCH resource. However, the bit domain where the 3 bits are located is still called the PUCCH resource indication field. Alternatively, the 1 bit used to indicate the BWP is called the BWP indication field, and the other 2 bits are called the PUCCH resource indication field. Alternatively, the 2 bits used to indicate the BWP are called the BWP indication field, and the other 1 bit is called the PUCCH resource indication field. Alternatively, for the second terminal device, the PUCCH resource indication field in the DCI including the BWP indication occupies 3 bits, and all of these 3 bits are used to indicate the PUCCH resources, but for the first terminal device, the PUCCH resource indication field in the DCI including the BWP indication may occupy only 1 bit, and the other 2 bits are used to indicate the BWP, or for the first terminal device, the PUCCH resource indication field in the DCI including the BWP indication may occupy only 2 bits, and the other 1 bit is used to indicate the BWP.

[0215] Further, when some bits in the PUCCH resource indication field in DCI format 1-0 are used to indicate BWP, the above bits used to indicate PUCCH resources for the first terminal device can be combined with a semi-statically configured PUCCH resource set to dynamically indicate PUCCH resources.

[0216] For example, the network device can semi-statically configure two sets of PUCCH resource sets through RRC signaling, and then combine the bits used to indicate PUCCH resources in the DCI to indicate which set of PUCCH resource sets to use. For example, the number of bits used to indicate PUCCH resources is 1 bit. When the bit value is 0, it indicates that the first terminal device uses the first set of PUCCH resource sets. When the bit value is 1, it indicates that the first terminal device uses the second set of PUCCH resource sets.

[0217] Furthermore, the network device may also change the PUCCH resource set through RRC reconfiguration.

[0218] In the above example (2), by indicating BWP using all or part of the bits in the PUCCH resource indication field in DCI format1-0, while reducing the impact on the PUCCH resource indication of the first terminal device, it can also ensure that the DCI is aligned with the DCI bit number for scheduling public information transmission, thereby reducing detection complexity and thereby reducing power consumption of the first terminal device.

[0219] Example (3): Part or all of the bits in the timing indication field between PDSCH and HARQ feedback in DCI format 1-0 are used to indicate BWP, and the length, position and specific indication content of other fields remain unchanged to obtain a DCI indicating BWP.

[0220] When all bits in the timing indication field between PDSCH and HARQ feedback in DCI format1-0 are used to indicate BWP to obtain DCI indicating BWP, the bits used to indicate BWP in the DCI indicating BWP can still be called the timing indication field between PDSCH and HARQ feedback, except that the meaning indicated by the timing indication field between PDSCH and HARQ feedback is different from the meaning indicated by DCI format1-0, or the bits used to indicate BWP in the DCI indicating BWP can also be named other fields, such as: named BWP indication field, etc., without limitation.

[0221] For example, taking the case where the bits occupied by the timing indication field between the PDSCH and the HARQ feedback in the DCI format 1-0 are 3 bits, in the embodiment of the present application, all the 3 bits can be used to indicate the BWP, but the bit domain where the 3 bits are located is still called the timing indication field between the PDSCH and the HARQ feedback. Alternatively, the bit domain where the 3 bits are located can be called the BWP indication field, that is, the DCI does not include the timing indication field between the PDSCH and the HARQ feedback.

[0222] Further, when all bits in the timing indication field between PDSCH and HARQ feedback in DCI format 1-0 are used to indicate BWP, the network device may determine that the timing relationship between PDSCH and HARQ feedback determined by the first terminal device is predefined.

[0223] For example, assuming that the first terminal device receives the PDSCH at time unit n, HARQ-ACK may be fed back at time unit n+k, where k is preconfigured.

[0224] When some bits in the timing indication field between PDSCH and HARQ feedback in DCI format 1-0 are used to indicate BWP, when a DCI indicating BWP is obtained, the timing indication field between PDSCH and HARQ feedback is still called the timing indication field between PDSCH and HARQ feedback in the DCI indicating BWP, except that the meaning indicated by the timing indication field between PDSCH and HARQ feedback is the same as that indicated in DCI. The meanings indicated by format1-0 are different, such as: the DCI indicating BWP includes a timing indication field between PDSCH and HARQ feedback, the timing indication field between PDSCH and HARQ feedback includes M4 bits, M2 bits of the M4 bits are used to indicate BWP, and M4-M2 bits are used to indicate other information, such as: indicating the timing relationship between PDSCH and HARQ feedback for the first terminal device, for example, assuming that the first terminal device receives PDSCH in the nth time unit, and according to the timing indication field, it can be determined that the timing delay between PDSCH and HARQ feedback for the PDSCH is k time units, then the first terminal device can feedback HARQ in the n+kth time unit. That is, it can be understood that the M4-M2 bits are actually used for the function of the PUCCH resource indication field.

[0225] Alternatively, when some bits in the timing indication field between PDSCH and HARQ feedback in DCI format 1-0 are used to indicate BWP, some bits in the timing indication field between PDSCH and HARQ feedback used to indicate BWP can be named other fields, such as: named BWP indication field, etc., and other bits in the timing indication field between PDSCH and HARQ feedback can still be called the timing indication field between PDSCH and HARQ feedback, etc., without restriction. For example, the DCI used to indicate BWP includes a timing indication field and a BWP indication field between PDSCH and HARQ feedback, the timing indication field and the BWP indication field between PDSCH and HARQ feedback have a total of M4 bits, the timing indication field between PDSCH and HARQ feedback includes M4-M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate BWP, the timing indication field between PDSCH and HARQ feedback is used to indicate the timing relationship between PDSCH and HARQ feedback for the first terminal device, M4 is the number of bits used when sending the timing indication field between PDSCH and HARQ feedback to the second terminal device, or it can also be described as M4 being the number of bits of the timing indication field between PDSCH and HARQ feedback in DCI format1-0. For example, the first terminal device can be understood as a REDCAP terminal, and the second terminal device can be understood as a non-REDCAP terminal device.

[0226] For example, taking the example that the timing indication field between PDSCH and HARQ feedback in DCI format 1-0 occupies 3 bits, in the embodiment of the present application, 1 bit of the 3 bits can be used to indicate BWP, and the other 2 bits can be used to indicate the timing relationship between PDSCH and HARQ feedback; or 2 bits of the 3 bits can be used to indicate BWP, and the other 1 bit can be used to indicate the timing relationship between PDSCH and HARQ feedback. However, the bit domain where these 3 bits are located is still called the timing indication field between PDSCH and HARQ feedback. Alternatively, the 1 bit used to indicate BWP is called the BWP indication field, and the other 2 bits are called the timing indication field between PDSCH and HARQ feedback. Alternatively, the 2 bits used to indicate BWP are called the BWP indication field, and the other 1 bit is called the timing indication field between PDSCH and HARQ feedback. Alternatively, for the second terminal device, the timing indication field between the PDSCH and the HARQ feedback in the DCI including the BWP indication occupies 3 bits, and all of these 3 bits are used to indicate the timing relationship between the PDSCH and the HARQ feedback, but for the first terminal device, the timing indication field between the PDSCH and the HARQ feedback in the DCI including the BWP indication may occupy only 1 bit, and the other 2 bits are used to indicate the BWP, or for the first terminal device, the timing indication field between the PDSCH and the HARQ feedback in the DCI including the BWP indication may occupy only 2 bits, and the other 1 bit is used to indicate the BWP.

[0227] Furthermore, when some bits in the timing indication field between PDSCH and HARQ feedback in DCI format1-0 are used to indicate BWP, the above-mentioned bits used to indicate the timing relationship between PDSCH and HARQ feedback for the first terminal device can be combined with the feedback timing between PDSCH and HARQ-ACK configured semi-statically to dynamically indicate the time position of HARQ-ACK feedback.

[0228] Exemplarily, the network device may semi-statically configure multiple different feedback timing values ​​between PDSCH and HARQ-ACK through RRC signaling, and then indicate the feedback timing value between PDSCH and HARQ-ACK specifically used by the first terminal device in combination with the HARQ-ACK timing indication in the DCI.

[0229] For example, the network device can semi-statically configure multiple different feedback timing values ​​through RRC signaling, and the feedback timing value may include k1 and k2. Assuming that the number of bits used to indicate the timing relationship between PDSCH and HARQ feedback is 1 bit, when the bit value is 0, the feedback timing value indicated is k1, and when the bit value is 1, the feedback timing value indicated is k2.

[0230] Furthermore, the network device may also change the feedback timing value through RRC reconfiguration.

[0231] In the above example (3), by indicating BWP using all or part of the bits in the timing indication field between PDSCH and HARQ feedback in DCI format1-0, while reducing the impact on the timing relationship between PDSCH and HARQ feedback indicated on the first terminal device, it is also possible to ensure that the DCI bit number of the DCI and the DCI bit number for scheduling public information transmission are aligned, thereby reducing the detection complexity and thereby reducing the power consumption of the first terminal device.

[0232] Example (4): Some bits in the frequency domain resource allocation field in DCI format 1-0 are used to indicate BWP, and the length, position and specific indication content of other fields remain unchanged to obtain a DCI indicating BWP.

[0233] When some bits in the frequency domain resource allocation field in DCI format1-0 are used to indicate BWP, when DCI indicating BWP is obtained, the frequency domain resource allocation field is still called the frequency domain resource allocation field in the DCI indicating BWP, but the meaning indicated by the frequency domain resource allocation field is different from the meaning indicated by DCI format1-0, such as: the DCI indicating BWP includes a frequency domain resource allocation field, the frequency domain resource allocation field includes M5 bits, M2 bits of the M5 bits are used to indicate BWP, and M5-M2 bits are used to indicate other information, such as: indicating the allocated frequency domain resources for the first terminal device.

[0234] Taking CORESET#0 as an example, when the bandwidth of CORESET#0 is 24 RBs, the frequency domain resource allocation field in DCI format1-0 occupies 9 bits, when the bandwidth of CORESET#0 is 48 RBs, the frequency domain resource allocation field in DCI format1-0 occupies 11 bits, and when the bandwidth of CORESET#0 is 96 RBs, the frequency domain resource allocation field in DCI format1-0 occupies 13 bits.

[0235] In one possible design, the number of bits used for frequency domain resource allocation is set to 9 bits.

[0236] In this way, when the bandwidth of CORESET#0 is 48 RBs or 96 RBs, the BWP can be indicated by the extra 2 bits or 4 bits.

[0237] It can be understood that, in this possible design, it is considered that the first terminal device supports BWP switching only when the bandwidth of CORESET#0 is greater than 24 RBs.

[0238] At this time, for the DCI with a bandwidth of 48 RBs for CORESET#0, although 9 bits of the 11 bits are used to indicate frequency domain resource allocation and 2 bits are used to indicate BWP, the total 11 bits are still called the frequency domain resource allocation field. For the DCI with a bandwidth of 96 RBs for CORESET#0, although 9 bits of the 13 bits are used to indicate the allocated frequency domain resources and 4 bits are used to indicate BWP, the total 13 bits are still called the frequency domain resource allocation field.

[0239] In another possible design, the number of bits used to indicate the allocated frequency domain resources is set to X bits, where X is less than 9.

[0240] Thus, when the bandwidth of CORESET#0 is 24 RBs, 48 ​​RBs, or 96 RBs, the BWP may be indicated by the extra 9-X bits, 11-X bits, or 13-X bits.

[0241] At this time, for the DCI with a bandwidth of 24 RBs for CORESET#0, although the X bit in the 9 bits is used to indicate the frequency domain resource allocation and the 9-X bits are used to indicate the BWP, the total 9 bits are still called the frequency domain resource allocation field. For the DCI with a bandwidth of 48 RBs for CORESET#0, although the X bit in the 11 bits is used to indicate the frequency domain resource allocation and the 11-X bits are used to indicate the BWP, the total 11 bits are still called the frequency domain resource allocation field. For the DCI with a bandwidth of 96 RBs for CORESET#0, although the X bit in the 13 bits is used to indicate the allocated frequency domain resources and the 13-X bits are used to indicate the BWP, the total 13 bits are still called the frequency domain resource allocation field. That is, it can be understood that the M5-M2 bits are actually used for the functions of the PUCCH resource indication field.

[0242] Alternatively, when some bits in the frequency domain resource allocation field in DCI format1-0 are used to indicate BWP, some bits in the frequency domain resource allocation field used to indicate BWP can be named as other fields, such as: named as BWP indication field, etc., and other bits in the frequency domain resource allocation field can still be called frequency domain resource allocation field, etc., without limitation. For example: the DCI used to indicate BWP includes a frequency domain resource allocation field and a BWP indication field, the frequency domain resource allocation field and the BWP indication field have a total of M5 bits, the frequency domain resource allocation field includes M5-M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate BWP, the frequency domain resource allocation field is used to indicate the allocated frequency domain resources for the first terminal device, M5 is the number of bits used when sending the frequency domain resource allocation field to the second terminal device, or it can also be described as M5 is the number of bits of the frequency domain resource allocation field in DCI format1-0. For example, the first terminal device can be understood as a REDCAP terminal, and the second terminal device can be understood as a non-REDCAP terminal device.

[0243] Still taking CORESET#0 as an example, a possible design is to set the number of bits used to indicate the allocated frequency domain resources to 9 bits.

[0244] In this way, when the bandwidth of CORESET#0 is 48 RBs or 96 RBs, the BWP can be indicated by the extra 2 bits or 4 bits.

[0245] It can be understood that, in this possible design, it is considered that the first terminal device supports BWP switching only when the bandwidth of CORESET#0 is greater than 24 RBs.

[0246] At this time, for the DCI with a bandwidth of 48 RBs for CORESET#0, 9 bits out of 11 bits are used to indicate the allocated frequency domain resources, and 2 bits are used to indicate BWP. The 9 bits are called the frequency domain resource allocation field, and the other 2 bits are called the BWP indication field. For the DCI with a bandwidth of 96 RBs for CORESET#0, 9 bits out of 13 bits are used to indicate the allocated frequency domain resources, and 4 bits are used to indicate BWP. The 9 bits are called the frequency domain resource allocation field, and the other 4 bits are called the BWP indication field. Alternatively, for the second terminal device, the frequency domain resource allocation field in the DCI including the BWP indication occupies 11 bits, and all of these 11 bits are used to indicate the allocated frequency domain resources, but for the first terminal device, the frequency domain resource allocation field in the DCI including the BWP indication may only occupy 9 bits, and the other 2 bits are used to indicate BWP. Or for the second terminal device, the frequency domain resource allocation field in the DCI including the BWP indication occupies 13 bits, and all of these 13 bits are used to indicate the allocated frequency domain resources, but for the first terminal device, the frequency domain resource allocation field in the DCI including the BWP indication may only occupy 9 bits, and the other 4 bits are used to indicate the BWP.

[0247] In another possible design, the number of bits used to indicate the allocated frequency domain resources is set to X bits, where X is less than 9.

[0248] Thus, when the bandwidth of CORESET#0 is 24 RBs, 48 ​​RBs, or 96 RBs, the BWP may be indicated by the extra 9-X bits, 11-X bits, or 13-X bits.

[0249] At this time, for the DCI with a bandwidth of 24 RBs for CORESET#0, the X bit in the 9 bits is used to indicate the allocated frequency domain resources, and the 9-X bits are used to indicate the BWP. The X bit is called the frequency domain resource allocation field, and the other 9-X bits are called the BWP indication field. For the DCI with a bandwidth of 48 RBs for CORESET#0, the X bit in the 11 bits is used to indicate the allocated frequency domain resources, and the 11-X bits are used to indicate the BWP. The X bit is called the frequency domain resource allocation field, and the other 11-X bits are called the BWP indication field. For the DCI with a bandwidth of 96 RBs for CORESET#0, the X bit in the 13 bits is used to indicate the allocated frequency domain resources, and the 13-X bits are used to indicate the BWP. The X bit is called the frequency domain resource allocation field, and the other 13-X bits are called the BWP indication field. Alternatively, for the second terminal device, the frequency domain resource allocation field in the DCI including the BWP indication occupies 9 bits, all of which are used to indicate the allocated frequency domain resources, but for the first terminal device, the frequency domain resource allocation field in the DCI including the BWP indication may only occupy X bits, and the other 9-X bits are used to indicate the BWP. Alternatively, for the second terminal device, the frequency domain resource allocation field in the DCI including the BWP indication occupies 11 bits, all of which are used to indicate the allocated frequency domain resources, but for the first terminal device, the frequency domain resource allocation field in the DCI including the BWP indication may only occupy X bits, and the other 11-X bits are used to indicate the BWP. Alternatively, for the second terminal device, the frequency domain resource allocation field in the DCI including the BWP indication occupies 13 bits, all of which are used to indicate the allocated frequency domain resources, but for the first terminal device, the frequency domain resource allocation field in the DCI including the BWP indication may only occupy X bits, and the other 13-X bits are used to indicate the BWP.

[0250] In the above example (4), by using part of the bits in the frequency domain resource allocation field in DCI format1-0 to indicate BWP, while reducing the impact on the frequency domain resources allocated to the first terminal device, it can also ensure that the DCI is aligned with the number of DCI bits for scheduling public information transmission, thereby reducing detection complexity and thereby reducing power consumption of the first terminal device.

[0251] It should be noted that in the above examples (1) to (4), when M2 is used to represent the number of bits used to indicate BWP, M2 in different examples may be the same or different, or M2 in some examples may be the same and M2 in some examples may be different, etc., without limitation.

[0252] It should be noted that in Figure 3In the method shown, when part or all of a field in the DCI format specified by the protocol is modified to indicate BWP to generate DCI indicating BWP, in order to fully indicate BWP, the number of bits of the modified field is greater than or equal to the number of bits indicating BWP.

[0253] Further, in Figure 3 In the method shown, the network device or the first terminal device may determine the number of bits (also described as the number of bits) used to indicate the BWP in any of the following ways:

[0254] Method 1: The number of bits used to indicate BWP is predefined.

[0255] Specifically, the number of bits used to indicate the BWP may be determined in a standard predefined manner.

[0256] For example, assuming that the protocol predetermines that the number of bits used to indicate BWP is B1, when the network device sends a DCI used to indicate BWP to the first terminal device, the network device sets the number of bits of BWP in the DCI to B1.

[0257] Method 2: Determine the number of bits used to indicate BWP according to the maximum number of BWPs corresponding to the first terminal device.

[0258] Optionally, for the first terminal device, if the maximum number of configurable BWPs is M, the number of bits used to indicate BWP in the DCI is ceil(log 2 M); where ceil(X) represents the integer that is greater than X and closest to X.

[0259] Method three: Determine the number of bits used to indicate BWP according to the maximum bandwidth of the first terminal device.

[0260] Optionally, for a first terminal device with a lower bandwidth capability, it is more necessary to implement data transmission on different BWPs through BWP switching to ensure frequency domain selective scheduling and reliability of data transmission. Therefore, for a first terminal device with a lower bandwidth capability, more bits are used to indicate BWP switching.

[0261] For example, the network device can simultaneously serve first terminal devices with bandwidth capabilities of 5 MHz, 10 MHz, 20 MHz and 100 MHz. The number of bits used to indicate BWP in the DCI can be determined based on the bandwidth capability of 5 MHz to ensure the reliability of data transmission.

[0262] Method 4: Determine the number of bits used to indicate BWP according to the bandwidth for transmitting public information.

[0263] Furthermore, the DCI may also include a first indication field.

[0264] The first indication field includes the number of bits used to indicate the BWP.

[0265] For example, the number of bits used to indicate BWP is 2 bits, and a first indication field may be set in the DCI, where the first indication field is used to indicate that the number of bits used by the first terminal device to indicate BWP is 2 bits.

[0266] Exemplarily, when DCI adopts the above example (1), some of the bits in the DAI field in DCI format1-0 can be used to indicate BWP, and some of the bits are set to the first indication field. Alternatively, when DCI adopts the above example (2), some of the bits in the PUCCH resource indication field in DCI format1-0 can be used to indicate BWP, and some of the bits are set to the first indication field. Alternatively, when DCI adopts the above example (3), some of the bits in the timing indication field between PDSCH and HARQ feedback in DCI format1-0 can be used to indicate BWP, and some of the bits are set to the first indication field. Alternatively, when DCI adopts the above example (4), some of the bits in the frequency domain resource allocation field in DCI format1-0 can be used to indicate BWP, and some of the bits are set to the first indication field, without limitation.

[0267] Optionally, the above examples (1) to (4) may also be described in the following manner:

[0268] Case 1: The DCI includes a DAI field for indicating the BWP.

[0269] Specifically, situation 1 may correspond to the relevant description in the above example (1), which will not be elaborated herein.

[0270] Case 2: The DCI includes a PUCCH resource indication field for indicating the BWP.

[0271] Specifically, situation 2 may correspond to the relevant description in the above example (2), which will not be elaborated here.

[0272] Case 3: The DCI includes a timing field between the PDSCH and the HARQ feedback, which is used to indicate the BWP.

[0273] Specifically, situation three may correspond to the relevant description in the above example (3), which will not be elaborated here.

[0274] Case 4: The DCI includes a frequency domain resource allocation field for indicating the BWP.

[0275] Specifically, situation four may correspond to the relevant description in the above example (4), which will not be elaborated here.

[0276] Case 5: The DCI includes a BWP indication field for indicating the BWP.

[0277] Specifically, situation four may correspond to the relevant descriptions in the above examples (1), (2), (3), and (4), and will not be elaborated herein.

[0278] Furthermore, the network device may also send second indication information to the first terminal device.

[0279] The second indication information is used to indicate one of a plurality of candidate situations, and is used to indicate the BWP to the first terminal device, wherein the plurality of candidate situations include at least two of situations one to five.

[0280] For example, the network device sends second indication information to the first terminal device, wherein the second indication information is used to indicate that the format of the DCI is the format described in situation one. In this way, after receiving the second indication information, the first terminal device can determine the BWP based on the DAI field.

[0281] Furthermore, the network device may also configure only a DCI format with a DCI bit size (or the DCI bit size) in the USS corresponding to the first terminal device, so that the first terminal device can detect the received DCI according to the DCI format, and the first terminal device can detect the matching DCI according to the DCI format, thereby reducing the detection complexity.

[0282] If the number of bits of the received DCI is the same as the number of bits of the pre-configured DCI format, it is considered that the DCI matches the DCI format, otherwise, it is considered that they do not match.

[0283] It should be noted that the above embodiments are mainly for downlink control information used for scheduling downlink physical channels. When downlink control information used for scheduling uplink physical channels is considered, it can be implemented through padding bits or other bits in the uplink control information without limitation.

[0284] Exemplarily, in order to simplify the PDCCH detection complexity of the first terminal device, the DCI format size corresponding to the downlink control information used to schedule the downlink physical channel and the downlink control information used to schedule the uplink physical channel can be the same.

[0285] Specifically, when accessing the network, the first terminal device will first determine the size of the downlink control information. In order to make the DCI format size corresponding to the uplink control information and the downlink control information the same, when the size of the uplink control information is smaller than the size of the downlink control information, the size of the uplink and downlink control information can be made the same by means of padding bits. Alternatively, when the size of the uplink control information is larger than the size of the downlink control information, the size of the uplink and downlink control information can be made the same by means of puncture. Therefore, in an embodiment of the present application, the padding bits in the uplink control information can also be used to indicate the BWP to achieve BWP switching, or when the uplink control information is the same size as the downlink control information by truncation, the BWP switching can be achieved by the method shown in the above embodiment, for example, the size of the frequency domain resource allocation control field in the uplink control information can be set to a fixed value, etc.

[0286] In the embodiment of the present application, illustratively, when the base station sends DCI to the UE, the DCI may be subjected to at least one of the following operations 1 and 2 to 6. Accordingly, when the UE receives the DCI, it may perform corresponding reverse operations, such as de-stuffing, adding truncated information bits, descrambling, channel decoding, and / or demodulation, etc., which will not be described in detail here.

[0287] Operation 1: Obtain the DCI according to the format corresponding to the DCI.

[0288] The information bits in the DCI may be referred to as the original bit stream of the DCI.

[0289] Optionally, operation 2: truncating or padding the input bit stream to obtain a truncated or padded bit stream.

[0290] The input bit stream may be an original bit stream.

[0291] In the embodiment of the present application, there is no restriction 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.

[0292] Optionally, operation 3: adding 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 can be a truncated or padded bit stream.

[0293] Optionally, operation 4: channel coding 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 matching 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.

[0294] Optionally, in operation 5, based on a scrambling sequence, the input bit stream is scrambled to obtain a scrambled bit stream. The scrambling operation can reduce inter-cell interference. The input bit stream of operation 5 can be an original bit stream, a truncated or padded bit stream, a CRC bit stream, or a channel coded bit stream.

[0295] 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.

[0296] In the present application, the number of bits of different DCIs (for example, DCI A and DCI B) is the same or aligned, which may include any of the following situations:

[0297] (1) The number of bits of the original bit stream of DCI A is the same as the number of bits of the original bit stream of DCI B. In the embodiment of the present application, the original bit stream of DCI may also be referred to as the information bit stream of DCI.

[0298] (2) 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.

[0299] (3) The number of bits of the original bit stream of DCI A and the number of bits of the truncated or padded bit stream of DCI B are the same.

[0300] (4) Perform a first operation on DCI A to obtain a first bit stream. Perform a first operation 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 CRC; adding CRC and channel coding; adding CRC and scrambling; or adding 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.

[0301] (5) Perform a second operation on DCI A to obtain a first group of modulation symbols. Perform a second operation on DCI B to obtain a second group of modulation symbols. The number of symbols in the first group of modulation symbols and the second group of modulation symbols is the same. 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.

[0302] The above mainly introduces the scheme provided by the embodiment of the present application from the perspective of interaction between each node. It is understandable that each node, such as a network device, a first terminal device, includes a hardware structure and / or software module corresponding to each function in order to realize the above functions. It should be easily appreciated by those skilled in the art that the method of the embodiment of the present application can be implemented in the form of hardware, software, or a combination of hardware and computer software in conjunction with the algorithm steps of each example described in the embodiment disclosed herein. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0303] The embodiment of the present application can divide the network device and the first terminal device into functional modules according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0304] Figure 4The structure diagram of a communication device 40 is shown. The communication device 40 may be a network device, a chip in a network device, a system on a chip, or other devices capable of implementing the functions of the network device in the above method. The communication device 40 may be used to perform the functions of the network device involved in the above method embodiment. As an implementable manner, Figure 4 The communication device 40 shown includes: a sending unit 401.

[0305] In one possible design, the sending unit 401 is used to send a DCI for indicating BWP to the first terminal device; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, and the BWP is used to transmit the physical data channel.

[0306] Specifically, the above Figure 3 All relevant contents of each step involved in the illustrated method embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here. The communication device 40 is used to execute Figure 3 The function of the network device in the control information transmission method shown can therefore achieve the same effect as the above-mentioned control information transmission method.

[0307] As another possible way to achieve this, Figure 4 The communication device 40 shown includes: a processing module and a communication module. The processing module is used to control and manage the actions of the communication device 40, and the communication module can integrate the functions of the sending unit 401, and can be used to support the communication device 40 to perform steps such as step 301 and communicate with other network entities, such as Figure 1 The communication device 40 may further include a storage module for storing instructions and / or data. When the instructions are executed by the processing module, the processing module may implement the above-mentioned method on the network device side.

[0308] The processing module may be a processor, a controller, a module or a circuit. It may implement or execute various exemplary logic blocks described in conjunction with the disclosure of the present application. The communication module may be a transceiver circuit, a pin, an interface circuit, a bus interface, or a communication interface. The storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device 40 involved in the embodiment of the present application may be Figure 2 The communication device shown.

[0309] 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. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0310] In the 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 the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application may also be a circuit or any other device that can implement a storage function, for storing instructions and / or data.

[0311] Figure 5 The structure diagram of a communication device 50 is shown. The communication device 50 may be a first terminal device, a chip in the first terminal device, a system on chip, or other devices capable of implementing the functions of the first terminal device in the above method. The communication device 50 may be used to perform the functions of the first terminal device involved in the above method embodiment. As an implementable manner, Figure 5 The communication device 50 shown includes: a receiving unit 501 and a processing unit 502 .

[0312] In one possible design, the receiving unit 501 is used to receive DCI from a network device; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, the DCI is used to indicate a BWP, and the BWP is used to transmit a physical data channel.

[0313] In one possible design, processing unit 502 is used to schedule a physical data channel according to DCI.

[0314] Specifically, the above Figure 3 All relevant contents of each step involved in the method embodiment shown can be referred to the functional description of the corresponding functional module, and will not be repeated here. The communication device 50 is used to execute Figure 3 The function of the first terminal device in the control information transmission method shown can therefore achieve the same effect as the above-mentioned control information transmission method.

[0315] As another possible way to achieve this, Figure 5 The communication device 50 shown includes: a processing module and a communication module. The processing module is used to control and manage the actions of the communication device 50. The processing module can integrate the functions of the processing unit 502, and the communication module can integrate the functions of the sending unit 501. It can be used to support the communication device 50 to perform steps such as step 302 and communicate with other network entities, such as Figure 1 The communication device 50 may further include a storage module for storing instructions and / or data. When the instructions are executed by the processing module, the processing module may implement the method on the first terminal device side.

[0316] The processing module may be a processor, a controller, a module or a circuit. It may implement or execute various exemplary logic blocks described in conjunction with the disclosure of the present application. The communication module may be a transceiver circuit, a pin, an interface circuit, a bus interface, or a communication interface. The storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device 50 involved in the embodiment of the present application may be Figure 2 The communication device shown.

[0317] 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. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor.

[0318] In the 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 the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiment of the present application may also be a circuit or any other device that can implement a storage function, for storing instructions and / or data.

[0319] Figure 6 A structural diagram of a communication system provided in an embodiment of the present application, such as Figure 6As shown, the communication system may include: a network device 60 and a first terminal device 61.

[0320] The network device 60 may have the function of the communication device 40. The first terminal device 61 may have the function of the communication device 50.

[0321] For example, the network device 60 is used to send a DCI for indicating BWP to the first terminal device; wherein the number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, and the BWP is used to transmit the physical data channel.

[0322] The first terminal device 61 is used to receive DCI from the network device, wherein the number of bits of DCI is a fixed number of bits, DCI is used to schedule physical data channels, DCI is used to indicate BWP, BWP is used to transmit physical data channels, and physical data channels are scheduled according to DCI.

[0323] Specifically, the specific implementation process of the network device 60 can refer to the above Figure 3 The execution process of the network device in the method embodiment will not be repeated here. The specific implementation process of the first terminal device 61 can refer to the above Figure 3 The execution process of the first terminal device in the method embodiment will not be repeated here.

[0324] The embodiment of the present application also provides a computer-readable storage medium. All or part of the processes in the above method embodiments can be completed by a computer program to instruct the relevant hardware, and the program can be stored in the above computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The computer-readable storage medium can be a communication device of any of the above embodiments, such as: an internal storage unit including a data sending end and / or a data receiving end, such as a hard disk or memory of a communication device. The above computer-readable storage medium can also be an external storage device of the above terminal device, such as a plug-in hard disk equipped on the above communication device, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc. Further, the above computer-readable storage medium can also include both an internal storage unit of the above communication device and an external storage device. The above computer-readable storage medium is used to store the above computer program and other programs and data required by the above communication device. The above computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0325] The present application also provides a computer instruction. All or part of the process in the above method embodiment can be completed by computer instructions to instruct related hardware (such as computers, processors, network devices, and terminals, etc.). The program can be stored in the above computer-readable storage medium.

[0326] It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0327] It should be understood that in the present application, "at least one (item)" means one or more, "more than one" means two or more, "at least two (items)" means two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0328] It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A. For example, B can be determined based on A. It should also be understood that determining B based on A does not mean determining B only based on A, but B can also be determined based on A and / or other information. In addition, the "connection" that appears in the embodiments of the present application refers to various connection methods such as direct connection or indirect connection to achieve communication between devices, and the embodiments of the present application do not impose any limitation on this.

[0329] Unless otherwise specified, the "transmission" (transmit / transmission) appearing in the embodiments of the present application refers to bidirectional transmission, including sending and / or receiving actions. Specifically, the "transmission" in the embodiments of the present application includes the sending of data, the receiving of data, or the sending of data and the receiving of data. In other words, the data transmission here includes uplink and / or downlink data transmission. Data may include channels and / or signals, uplink data transmission is uplink channel and / or uplink signal transmission, and downlink data transmission is downlink channel and / or downlink signal transmission. The "network" and "system" appearing in the embodiments of the present application express the same concept, and the communication system is the communication network.

[0330] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0331] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0332] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0333] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0334] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including several instructions to enable a device, such as a single-chip microcomputer, a chip, etc., or a processor (processor) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks or optical disks.

[0335] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A control information transmission method, characterized in that: include: Receive downlink control information DCI from the network device; The number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, the DCI is used to indicate a bandwidth part BWP, and the BWP is used to transmit the physical data channel; The number of bits of the DCI is determined according to the bandwidth of the control resource set CORESET#0; or The number of bits of the DCI is aligned with the number of bits of the DCI used for scheduling common information, wherein the common information includes a system message, a paging message or a random access response RAR.

2. The method according to claim 1, characterized in that The DCI includes a downlink allocation index DAI field; wherein the DAI field is used to indicate the BWP; or The DCI does not include a downlink allocation index DAI field.

3. The method according to claim 2, characterized in that The method further comprises: The hybrid automatic repeat request HARQ feedback mode for the downlink physical data channel transmitted in the downlink physical data channel transmission window is determined to be a static codebook mode.

4. The method according to claim 1, characterized in that: The DCI includes a downlink allocation index DAI field; wherein the DAI field includes M1 bits, M2 bits of the M1 bits are used to indicate the BWP, and the M1 is the number of bits used when the network device sends the DAI field to the second terminal device.

5. The method according to claim 4, characterized in that The M1 minus M2 bits in the DAI field are used to indicate the number of downlink physical data channels transmitted in the downlink physical data channel transmission window.

6. The method according to claim 1, characterized in that The DCI includes a downlink allocation index DAI field and a BWP indication field; wherein the DAI field includes M1 minus M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate the BWP, the DAI field is used to indicate the number of downlink physical data channels transmitted in the downlink physical data channel transmission window, and M1 is the number of bits used when the network device sends the DAI field to the second terminal device.

7. The method according to claim 1, characterized in that The DCI includes a physical uplink control channel PUCCH resource indication field; wherein the PUCCH resource indication field is used to indicate the BWP; or The DCI does not include a physical uplink control channel PUCCH resource indication field.

8. The method according to claim 7, characterized in that The method further comprises: It is determined that the PUCCH resource is predefined.

9. The method according to claim 1, characterized in that: The DCI includes a physical uplink control channel PUCCH resource indication field; wherein the PUCCH resource indication field includes M3 bits, M2 bits of the M3 bits are used to indicate the BWP, and M3 is the number of bits used when the network device sends the PUCCH resource indication field to the second terminal device.

10. The method according to claim 9, characterized in that M3 minus M2 bits in the PUCCH resource indication field are used to indicate PUCCH resources.

11. The method according to claim 1, characterized in that: The DCI includes a physical uplink control channel PUCCH resource indication field and a BWP indication field; wherein the PUCCH resource indication field includes M3 minus M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate the BWP, the PUCCH resource indication field is used to indicate the PUCCH resources, and M3 is the number of bits used when the network device sends the DAI field to the second terminal device.

12. The method according to claim 1, characterized in that The DCI includes a timing indication field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback; wherein the timing indication field between the PDSCH and the HARQ feedback is used to indicate the BWP; or The DCI does not include a timing indication field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback.

13. The method according to claim 12, characterized in that Determining the timing relationship between the PDSCH and HARQ feedback is predefined.

14. The method according to claim 1, characterized in that The DCI includes a timing indication field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback; wherein the timing indication field between the PDSCH and the HARQ feedback includes M4 bits, M2 bits of the M4 bits are used to indicate the BWP, and the M4 is the number of bits used when the network device sends the timing indication field between the PDSCH and the HARQ feedback to the second terminal device.

15. The method according to claim 14, characterized in that The M4 minus M2 bits in the timing indication field between the PDSCH and the HARQ feedback are used to indicate the timing relationship between the PDSCH and the HARQ feedback.

16. The method according to claim 1, characterized in that The DCI includes a timing indication field and a BWP indication field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback; wherein, the timing indication field between the PDSCH and the HARQ feedback includes M4 minus M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate the BWP, the timing indication field between the PDSCH and the HARQ feedback is used to indicate the timing relationship between the PDSCH and the HARQ feedback, and the M4 is the number of bits used when the network device sends the timing indication field between the PDSCH and the HARQ feedback to the second terminal device.

17. The method according to claim 1, characterized in that The DCI includes a frequency domain resource allocation field; wherein the frequency domain resource allocation field includes M5 bits, M2 bits of the M5 bits are used to indicate the BWP, and the M5 is the number of bits used when the network device sends the frequency domain resource allocation field to the second terminal device.

18. The method according to claim 17, characterized in that M5 minus M2 bits in the frequency domain resource allocation field are used to indicate the allocated frequency domain resources.

19. The method according to claim 1, characterized in that The DCI includes a frequency domain resource allocation field and a BWP indication field; wherein the frequency domain resource allocation field includes M5 minus M2 bits, the BWP indication field includes M2 bits, the BWP indication field is used to indicate the BWP, the frequency domain resource allocation field is used to indicate the allocated frequency domain resources, and M5 is the number of bits used when the network device sends the frequency domain resource allocation field to the second terminal device.

20. The method according to any one of claims 1 to 19, characterized in that: The method further comprises: The number of bits used to indicate the BWP is predefined; Determine the number of bits used to indicate the BWP according to the maximum number of BWPs corresponding to the first terminal device; Determining the number of bits used to indicate the BWP according to the maximum bandwidth of the first terminal device; or The number of bits used to indicate the BWP is determined according to the bandwidth used to transmit the public information.

21. The method according to any one of claims 1 to 19, characterized in that: The DCI also includes a first indication field; wherein the first indication field indicates the number of bits used to indicate the BWP.

22. The method according to claim 21, characterized in that The number of bits of the first indication field is a fixed number of bits.

23. The method according to claim 1, characterized in that The DCI is used to indicate the BWP, including: Case 1: the DCI includes a downlink allocation index DAI field, which is used to indicate the BWP; Case 2: the DCI includes a physical uplink control channel PUCCH resource indication field, which is used to indicate the BWP; Case 3: the DCI includes a timing field between a physical downlink shared channel PDSCH and a hybrid automatic repeat request HARQ feedback, which is used to indicate the BWP; Case 4: the DCI includes a frequency domain resource allocation field for indicating the BWP; or Case 5: The DCI includes a BWP indication field for indicating the BWP.

24. The method according to claim 23, characterized in that The method further comprises: Receive second indication information from the network device; wherein the second indication information is used to indicate one from a plurality of candidate situations, used to indicate BWP, and the plurality of candidate situations include at least two of the situations one to five.

25. The method according to any one of claims 1-19, 22-24, characterized in that: The method further comprises: receiving a DCI having the fixed number of bits from the network device; The received DCI is interpreted according to the DCI format of the DCI.

26. A control information transmission method, characterized in that: include: Sending downlink control information DCI to the first terminal device; The number of bits of the DCI is a fixed number of bits, the DCI is used to schedule a physical data channel, the DCI is used to indicate a BWP, and the BWP is used to transmit the physical data channel; The number of bits of the DCI is determined according to the bandwidth of the control resource set CORESET#0; or The number of bits of the DCI is aligned with the number of bits of the DCI used for scheduling common information, wherein the common information includes a system message, a paging message or a random access response RAR.

27. A communication device, characterized in that: Used to execute the control information transmission method according to any one of claims 1 to 25 or the control information transmission method according to claim 26.

28. A communication device, characterized in that: It includes a processor and a memory, the memory and the processor are coupled, and the processor is used to execute the control information transmission method according to any one of claims 1 to 25 or the control information transmission method according to claim 26.

29. A communication device, characterized in that: It includes a processor and a communication interface, and the processor uses the communication interface to execute the control information transmission method according to any one of claims 1 to 25 or the control information transmission method according to claim 26.

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