CN110839291A

CN110839291A - Method and device for transmitting downlink control information

Info

Publication number: CN110839291A
Application number: CN201810944776.7A
Authority: CN
Inventors: 高飞; 焦淑蓉; 李俊超; 花梦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-08-19
Filing date: 2018-08-19
Publication date: 2020-02-25
Anticipated expiration: 2038-08-19
Also published as: CN110839291B

Abstract

The application provides a method and a device for transmitting downlink control information, wherein the method comprises the following steps: the method comprises the steps that a network side device sends first configuration information to a terminal side device, the first configuration information is used for configuring a search space, the terminal side device receives the first configuration information sent by the network side device and detects first DCI and second DCI in the search space according to the first configuration information, and the first DCI comprises: a first field and a truncated second field; or the first field and the second field being truncated; or the first field being truncated and the second field being truncated; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI. The method and the device for transmitting the downlink control information can reduce the complexity of blind detection of DCI by terminal side equipment.

Description

Method and device for transmitting downlink control information

Technical Field

The present application relates to the field of communications, and in particular, to a method and an apparatus for transmitting downlink control information in the field of communications.

Background

In a fifth generation mobile communication system, frequency domain resource allocation is divided into two types, namely a resource allocation type 0 and a resource allocation type 1, wherein the resource allocation type 0 does not support frequency hopping, and the resource allocation type 1 is divided into two cases, namely frequency hopping support and frequency hopping non-support. Therefore, the network side device may indicate whether frequency hopping is supported to the terminal device through a frequency hopping flag (frequency hopping flag) in Downlink Control Information (DCI). Specifically, if the frequency hopping flag bit indicates that frequency hopping is supported, a Frequency Domain Resource Allocation (FDRA) field of the DCI includes a frequency hopping offset indication bit and an actual frequency domain resource allocation indication bit, the highest 1bit or 2bits indicate the size of the frequency hopping offset, and the remaining number of bits indicates resource allocation. If the frequency hopping flag bit indicates that frequency hopping is not supported, the whole frequency domain allocation indication field indicates resource allocation without a frequency hopping offset indication bit.

The DCI with different formats may have different lengths, and for various DCI with different lengths, in the process of transmitting DCI by the network side device and the terminal device, the terminal side device needs to perform blind detection on the DCI with different lengths, which is higher in complexity.

Disclosure of Invention

The application provides a method and a device for transmitting downlink control information, which can reduce the complexity of blind detection of DCI by terminal side equipment.

In a first aspect, a method for transmitting downlink control information is provided, including: the method comprises the steps that terminal side equipment receives first configuration information sent by network side equipment, wherein the first configuration information is used for configuring a search space; the terminal side device detects first Downlink Control Information (DCI) and second DCI in the search space according to the first configuration information, wherein the first DCI comprises: a first field and a truncated second field; or the first field and the second field being truncated; or the first field being truncated and the second field being truncated; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

According to the method for transmitting the downlink control information, the second DCI and the first DCI with the same bit number as the second DCI are transmitted by the network side equipment and the terminal side equipment, so that the blind detection complexity of the terminal side equipment can be reduced, and the system performance is improved.

In this embodiment, the bit number of the DCI refers to the bit number of the entire DCI which needs to be blind-detected by the terminal side device. It should be understood that the number of DCI bits is equal to the number of remaining DCI information bits after the DCI information bits are punctured or the number of DCI information bits plus the number of complementary zero bits, where the DCI information bits is the number of information bits before the DCI information bits are zero-padded or punctured. If the puncturing operation is performed on the DCI, the bit number of the DCI is equal to the residual bit number after the bit number of the DCI information is punctured, and if the zero padding operation is performed on the DCI, the bit number of the DCI is equal to the bit number of the DCI information plus the number of the supplemented zero bits.

In order to reduce the blind detection complexity of the terminal side device, the network side device needs to perform truncation operation on the DCI with a longer length in the at least two types of DCI with different lengths, so as to ensure that the DCI with one type of length is transmitted. Specifically, the first DCI is DCI generated after the network side device performs the puncturing operation, and the bit number of the first DCI is the same as the bit number of the second DCI.

The network side device may generate the first DCI through different operation modes, so that a plurality of situations may exist in a field of the first DCI, which is not limited in this embodiment of the present invention.

In a possible implementation manner, the first DCI may be DCI format0_, and the second DCI may be 0DCI format1_ 0.

With reference to the first aspect, in certain implementations of the first aspect, the number of bits of the truncated first field is greater than 0, and the number of bits of the truncated second field is equal to or greater than 0.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: the terminal-side device determines that the first DCI includes the first field and the second field that are truncated when at least one of the following conditions is satisfied: the number of bits by which the first field is truncated is less than or equal to a first threshold; the number of bits of the truncated first field is greater than a second threshold; the bandwidth of the initial uplink bandwidth part is larger than a third threshold value; and the network side equipment configures the terminal side equipment for transmission precoding through high-level signaling.

Specifically, the network side device may determine whether to perform the puncturing operation on the second field according to at least one of the truncated bit number of the first field, the bandwidth of the initial uplink bandwidth portion, and information, such as whether the network side device configures a terminal side device to perform transmission precoding (transform precoder). Correspondingly, the terminal side device may determine a field included in the first DCI according to at least one of the above information. Therefore, the terminal side equipment and the network side equipment can judge according to the same information, so that the understanding of the terminal side equipment and the understanding of the network side equipment are consistent, and errors are not easy to occur.

In the embodiment of the application, the network side equipment reserves the frequency hopping bit when the truncating operation is executed, so that the truncating operation does not cause the terminal side equipment to be incapable of frequency hopping, the terminal side equipment can obtain the frequency diversity gain through the frequency hopping, and the performance of cell edge users is ensured.

Optionally, if the number of bits truncated for the first field is less than or equal to the first threshold, it indicates that the network side device does not truncate the second field. In other words, if the bit number of the truncated first field is greater than the second threshold, it indicates that the network side device does not truncate the second field.

This is because, when the number of bits to be truncated is too small, only the first field is truncated, and frequency hopping can be ensured. If the number of bits to be intercepted is too large, intercepting only the first field will result in wasting resource allocation indicating bits and losing more indicating resources, in which case, the puncturing operation may also be performed on the second field.

Optionally, if the bandwidth of the initial uplink bandwidth part is greater than the third threshold, it indicates that the network side device does not truncate the second field and reserves the hopping bit. This is because when the bandwidth of the initial uplink bandwidth part is large enough, it can be guaranteed that the frequency hopping can bring a certain diversity gain, otherwise, the bandwidth of the initial uplink bandwidth part is not large enough, and it is meaningless that the frequency hopping gain is too small.

The first threshold, the second threshold, and the third threshold are predefined values, or values configured by the network side device for the terminal side device through signaling, which is not limited in this embodiment of the application.

Optionally, when the network side device configures the transmission precoding enable, the network side device may reserve the hopping bits, and otherwise may intercept the hopping bits. In other words, when the DFT-s-OFDM waveform is used on the initial uplink bandwidth portion, the network side device may retain the hopping bits, and may intercept the hopping bits otherwise. This is because when the DFS-s-OFDM waveform is used on the initial uplink bandwidth portion, the uplink coverage of the terminal-side device is limited, enabling frequency hopping can guarantee the uplink coverage.

With reference to the first aspect, in certain implementations of the first aspect, the first DCI is generated by any one of the following operation modes: a truncated mode of operation starting from the most significant bit of the first field; a truncated mode of operation starting from the most significant bit of the second field; truncating the partial information bits of the second field and then starting the operation mode of truncation from the highest bit of the first field.

Specifically, the network side device may truncate from the highest bit of the first field, may truncate from the highest bit of the second field, and may truncate the partial information bit of the second field first and then truncate from the highest bit of the first field. It should be understood that the second field precedes the first field. Therefore, the network side equipment can adopt the different operations according to different requirements, and the flexibility of transmitting the downlink control information is greatly improved.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: the terminal side equipment receives second configuration information sent by the network side equipment, wherein the second configuration information indicates an operation mode adopted by the first DCI; the detecting, by the terminal-side device, the first DCI and the second DCI in the search space according to the first configuration information includes: and the terminal side equipment detects the first DCI and the second DCI in the search space according to the first configuration information and the second configuration information.

In another possible implementation, the above operation mode may be protocol-agreed.

In a second aspect, another method for transmitting downlink control information is provided, including: the method comprises the steps that network side equipment sends first configuration information to terminal side equipment, wherein the first configuration information is used for configuring a search space; the network side equipment sends first downlink control information DCI and/or second DCI to terminal side equipment, wherein the first DCI comprises: a first field and a truncated second field; or the first field and the second field being truncated; or the first field being truncated and the second field being truncated; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

With reference to the second aspect, in some implementations of the second aspect, the number of bits of the truncated first field is greater than 0, and the number of bits of the truncated second field is equal to or greater than 0.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: the network side device determines that the first DCI includes the first field and the second field that are truncated when at least one of the following conditions is satisfied: the number of bits by which the first field is truncated is less than or equal to a first threshold; the number of bits of the truncated first field is greater than a second threshold; the bandwidth of the initial uplink bandwidth part is larger than a third threshold value; and the network side equipment configures the terminal side equipment for transmission precoding through high-level signaling.

With reference to the second aspect, in certain implementations of the second aspect, the first DCI is generated by any one of the following operation modes: a truncated mode of operation starting from the most significant bit of the first field; a truncated mode of operation starting from the most significant bit of the second field; truncating the partial information bits of the second field and then starting the operation mode of truncation from the highest bit of the first field.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: and second configuration information sent by the network side device to the terminal side device, wherein the second configuration information indicates an operation mode adopted for the first DCI.

In a third aspect, another method for transmitting downlink control information is provided, including: the terminal side equipment determines search spaces of first Downlink Control Information (DCI), second DCI, third DCI and fourth DCI; the terminal-side device detecting the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; the first DCI has the same bit number as the second DCI through zero padding operation or truncation operation, the third DCI has the same bit number as the second DCI through zero padding operation or truncation operation, and the fourth DCI has the same bit number as the second DCI through zero padding operation or truncation operation according to the initial downlink bandwidth part.

Specifically, there are four DCIs with possibly different lengths, and in order to reduce the blind detection complexity of the terminal side device, the network side device may perform an alignment operation on the DCIs before transmitting. The alignment operation may be a zero padding operation or a truncating operation. The first DCI, the second DCI, the third DCI, and the fourth DCI are DCIs obtained by performing an alignment operation on the four DCIs that may have different lengths.

According to the method for transmitting the downlink control information, the network side equipment aligns the DCI, and the terminal side equipment detects the DCI in the corresponding search space in the same manner, so that the blind detection complexity of the terminal side equipment can be reduced, and the system performance is improved.

With reference to the third aspect, in certain implementations of the third aspect, the first DCI is DCI format0_ 0in a common search space CSS; the second DCI is DCI format1_ 0in the CSS; the third DCI is DCI format0_ 0in a user-specific search space USS; the fourth DCI is DCI format1_ 0in the USS.

In a fourth aspect, another method for transmitting downlink control information is provided, including: the network side equipment determines search spaces of first Downlink Control Information (DCI), second DCI, third DCI and fourth DCI; the network side device transmits at least one of the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; the first DCI has the same bit number as the second DCI through zero padding operation or truncation operation, the third DCI has the same bit number as the second DCI through zero padding operation or truncation operation, and the fourth DCI has the same bit number as the second DCI through zero padding operation or truncation operation according to the initial downlink bandwidth part.

With reference to the fourth aspect, in certain implementations of the fourth aspect, the first DCI is DCI format0_ 0in common search space CSS; the second DCI is DCI format1_ 0in the CSS; the third DCI is DCI format0_ 0in a user-specific search space USS; the fourth DCI is DCI format1_ 0in the USS.

In a fifth aspect, another method for transmitting downlink control information is provided, including: the terminal side equipment determines search spaces of first Downlink Control Information (DCI), second DCI, third DCI and fourth DCI; the terminal-side device detecting the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; and generating a third DCI according to the activated uplink bandwidth part and performing zero padding operation on the third DCI to obtain a third DCI with the same bit number as the fourth DCI.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the first DCI is DCI format0_ 0in common search space CSS; the second DCI is DCI format1_ 0in the CSS; the third DCI is DCI format0_ 0in a user-specific search space USS; the fourth DCI is DCI format1_ 0in the USS.

In a sixth aspect, another method for transmitting downlink control information is provided, including: the network side equipment determines search spaces of first Downlink Control Information (DCI), second DCI, third DCI and fourth DCI; the network side device transmits at least one of the first DCI, the second DCI, the third DCI and the fourth DCI in the search space; and generating a third DCI according to the activated uplink bandwidth part and performing zero padding operation on the third DCI to obtain a third DCI with the same bit number as the fourth DCI.

With reference to the sixth aspect, in certain implementations of the sixth aspect, the first DCI is DCI format0_ 0in a common search space CSS; the second DCI is DCI format1_ 0in the CSS; the third DCI is DCI format0_ 0in a user-specific search space USS; the fourth DCI is DCI format1_ 0in the USS.

A seventh aspect provides an apparatus for transmitting downlink control information, configured to perform the method in any possible implementation manner of any one of the foregoing aspects. In particular, the apparatus comprises means for performing the method of any of the possible implementations of any of the aspects described above.

In an eighth aspect, another apparatus for transmitting downlink control information is provided, the apparatus including: a transceiver, a memory, and a processor. Wherein the transceiver, the memory, and the processor communicate with each other through an internal connection path, the memory is configured to store instructions, the processor is configured to execute the instructions stored by the memory to control the receiver to receive signals and control the transmitter to transmit signals, and the processor is configured to execute the instructions stored by the memory to cause the processor to perform the method of any one of the possible implementations of any one of the aspects.

In a ninth aspect, there is provided a computer program product, the computer program product comprising: computer program code which, when run by a computer, causes the computer to perform the method of the above aspects.

In a tenth aspect, a computer-readable medium is provided for storing a computer program comprising instructions for performing the method in the above aspects.

In an eleventh aspect, there is provided a chip comprising a processor for calling up and executing instructions stored in a memory from the memory, so that a communication device in which the chip is installed performs the method in the above aspects.

In a twelfth aspect, another chip is provided, including: the system comprises an input interface, an output interface, a processor and a memory, wherein the input interface, the output interface, the processor and the memory are connected through an internal connection path, the processor is used for executing codes in the memory, and when the codes are executed, the processor is used for executing the method in the aspects.

Drawings

Fig. 1 shows a schematic diagram of a communication system of an embodiment of the present application.

Fig. 2 shows a schematic flow chart of a method for transmitting downlink control information according to an embodiment of the present application.

Fig. 3 shows a schematic comparison of FDRA domains before and after performing a truncation operation according to an embodiment of the application.

Fig. 4 shows a schematic comparison of the FDRA domain before and after another truncation operation is performed according to an embodiment of the application.

Fig. 5 shows a schematic comparison diagram of the FDRA domain after another truncation operation is performed according to an embodiment of the present application.

Fig. 6 shows a schematic comparison of the FDRA domain before and after another truncation operation is performed according to an embodiment of the application.

Fig. 7 is a schematic flow chart of another method for transmitting downlink control information according to an embodiment of the present application.

Fig. 8 is a schematic block diagram of an apparatus for transmitting downlink control information according to an embodiment of the present application.

Fig. 9 is a schematic block diagram of another apparatus for transmitting downlink control information according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

It should be understood that the technical solution of the embodiment of the present application may be applied to various communication systems, such as a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD), a fifth generation (5th generation, 5G) system (also called New Radio (NR)), and the like.

It should also be understood that the technical solution of the embodiment of the present application may also be applied to various communication systems based on non-orthogonal multiple access technologies, such as Sparse Code Multiple Access (SCMA) systems, and certainly SCMA may also be referred to as other names in the communication field; further, the technical solution of the embodiment of the present application may be applied to a multi-carrier transmission system using a non-orthogonal multiple access technology, for example, an Orthogonal Frequency Division Multiplexing (OFDM) system using a non-orthogonal multiple access technology, a filter bank multi-carrier (FBMC), a General Frequency Division Multiplexing (GFDM) system, a filtered orthogonal frequency division multiplexing (F-OFDM) system, and the like.

It should also be understood that in the embodiments of the present application, a terminal device, which may be referred to as an access terminal, a User Equipment (UE), a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment, may communicate with one or more core networks via a Radio Access Network (RAN). An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network, a terminal device in a future evolved Public Land Mobile Network (PLMN), or the like.

It should also be understood that in the embodiment of the present application, the network device may be used to communicate with a terminal device, an evolved node B (eNB) or eNode B in an LTE system, or the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network side device in a future 5G network or a network device in a future evolved PLMN network, or the like.

The embodiment of the application can be applied to an LTE system, a subsequent evolution system such as 5G and the like, or other wireless communication systems adopting various wireless access technologies such as systems adopting access technologies of code division multiple access, frequency division multiple access, time division multiple access, orthogonal frequency division multiple access, single carrier frequency division multiple access and the like, and is particularly applicable to scenes needing channel information feedback and/or applying a secondary precoding technology, such as a wireless network applying a Massive MIMO technology, a wireless network applying a distributed antenna technology and the like.

It should be understood that a multiple-input-multiple-output (MIMO) technique refers to using a plurality of transmitting antennas and receiving antennas at a transmitting end device and a receiving end device, respectively, so that signals are transmitted and received through the plurality of antennas of the transmitting end device and the receiving end device, thereby improving communication quality. The multi-antenna multi-transmission multi-receiving system can fully utilize space resources, realize multi-transmission and multi-reception through a plurality of antennas, and improve the system channel capacity by times under the condition of not increasing frequency spectrum resources and antenna transmitting power.

MIMO can be classified into single-user multiple-input multiple-output (SU-MIMO) and multi-user multiple-input multiple-output (MU-MIMO). Massive MIMO is based on the principle of multi-user beam forming, hundreds of antennas are arranged on transmitting end equipment, respective beams are modulated for dozens of target receivers, and dozens of signals are transmitted on the same frequency resource simultaneously through space signal isolation. Therefore, the Massive MIMO technology can fully utilize the spatial freedom degree brought by large-scale antenna configuration, and the frequency spectrum efficiency is improved.

Fig. 1 is a schematic diagram of a communication system used in an embodiment of the present application. As shown in fig. 1, the communication system 100 includes a network device 102, and the network device 102 may include multiple antenna groups. Each antenna group can include one or more antennas, e.g., one antenna group can include

antennas

104 and 106, another antenna group can include

antennas

108 and 110, and an additional group can include

antennas

112 and 114. 2 antennas are shown in fig. 1 for each antenna group, however, more or fewer antennas may be utilized for each group. Network device 102 can additionally include a transmitter chain and a receiver chain, each of which can comprise a plurality of components associated with signal transmission and reception, such as processors, modulators, multiplexers, demodulators, demultiplexers, antennas, and so forth, as will be appreciated by one skilled in the art.

Network device 102 may communicate with multiple terminal devices, for example, network device 102 may communicate with terminal device 116 and terminal device 122. However, it is understood that network device 102 may communicate with any number of terminal devices similar to

terminal devices

116 or 122.

End devices

116 and 122 may be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless communication system 100.

As shown in fig. 1, terminal device 116 is in communication with

antennas

112 and 114, where

antennas

112 and 114 transmit information to terminal device 116 over forward link 118 and receive information from terminal device 116 over reverse link 120. In addition, terminal device 122 is in communication with

antennas

104 and 106, where

antennas

104 and 106 transmit information to terminal device 122 over forward link 124 and receive information from terminal device 122 over reverse link 126.

In a frequency division duplex, FDD system, forward link 118 can utilize a different frequency band than that used by reverse link 120, and forward link 124 can utilize a different frequency band than that used by reverse link 126, for example.

As another example, in a Time Division Duplex (TDD) system and a full duplex (full duplex) system, forward link 118 and reverse link 120 can utilize a common frequency band and forward link 124 and reverse link 126 can utilize a common frequency band.

Each group of antennas and/or area designed for communication is referred to as a sector of network device 102. For example, antenna groups may be designed to communicate to terminal devices in a sector of the areas covered by network device 102. During communication by network device 102 with

terminal devices

116 and 122 over

forward links

118 and 124, respectively, the transmitting antennas of network device 102 may utilize beamforming to improve signal-to-noise ratio of

forward links

118 and 124. Moreover, mobile devices in neighboring cells can experience less interference when network device 102 utilizes beamforming to transmit to

terminal devices

116 and 122 scattered randomly through an associated coverage area, as compared to a manner in which a network device transmits through a single antenna to all its terminal devices.

At a given time, network device 102, terminal device 116, or terminal device 122 may be a wireless communication transmitting apparatus and/or a wireless communication receiving apparatus. When sending data, the wireless communication sending device may encode the data for transmission. Specifically, the wireless communication transmission apparatus may acquire a certain number of data bits to be transmitted to the wireless communication reception apparatus through the channel, for example, the wireless communication transmission apparatus may generate, receive from another communication apparatus, or save in a memory or the like a certain number of data bits to be transmitted to the wireless communication reception apparatus through the channel. Such data bits may be contained in a transport block or transport blocks of data, which may be segmented to produce multiple code blocks.

Furthermore, the communication system 100 may be a public land mobile network PLMN (public land mobile network) network or device-to-device (D2D) network or machine-to-machine (M2M) network or other networks, which is illustrated in fig. 1 for ease of understanding only and is a simplified schematic diagram, and other network devices may be included in the network, which are not shown in fig. 1.

For ease of understanding, the relevant terms referred to herein are first introduced below.

1. Bandwidth part (BWP)

The 3rd Generation partnership project (3 GPP) standards organization is currently setting up a 5th Generation (5G) protocol standard, also known as New Radio (NR), for a 5th Generation cellular mobile communication system. Compared with a Long Term Evolution (LTE) system, the NR system has a characteristic that a network side and a terminal side can configure different bandwidths. The terminal device may configure its maximum operating bandwidth according to its service requirement and manufacturing cost, for example, the operating bandwidth of a low-cost low-rate terminal device may be only 5MHz, while the operating bandwidth of a high-rate high-performance terminal device may reach 100 MHz. If a carrier bandwidth of a cell is set according to the working bandwidth of a terminal device with low cost and background rate (for example, set to 5 MHz-10 MHz), a high-performance terminal device can obtain a higher rate by adopting a carrier aggregation (carrier aggregation), which inevitably increases control signaling overhead and processing complexity; if the carrier bandwidth of a cell is set according to the operating bandwidth of a high-rate high-performance terminal device (e.g., 100MHz), a low-cost terminal device must be equipped with radio frequency and baseband devices suitable for a large bandwidth to be able to access the cell, which undoubtedly increases the cost. Thus, NR introduces the concept of BWP.

A BWP is a contiguous segment of frequency resources on a cell carrier, and the network can configure BWPs with different bandwidth sizes for different terminal devices. When a BWP is configured and activated, the BWP is called activated BWP (active BWP), and data and control information sent upstream or data and control information received downstream by the terminal device are limited to the active BWP. The current protocol supports data transmission on 1 active BWP only for 1 end device. The BWP allocated by the terminal device at the initial access is called initial BWP (initial BWP). The identification of the initial BWP is, for example, 0.

2. Blind inspection

The DCI scheduling different data transmissions may be scrambled with different Radio Network Temporary Identifiers (RNTIs), for example, the RNTIs may include a cell-RNTI (C-RNTI), an access identifier (random access-RNTI, RA-RNTI), a paging identifier (paging-RNTI, P-RNTI), and the like, where the C-RNTI may be used to scramble the DCI scheduling user data, the RA-RNTI may be used to scramble a random access response message sent by a scheduling network device to a terminal device, and the P-RNTI may be used to scramble the paging message.

Taking C-RNTI as an example, Physical Downlink Control Channels (PDCCHs) of different users can be distinguished by their corresponding C-RNTIs, that is, Cyclic Redundancy Check (CRC) of DCI is masked by C-RNTI. The user generally does not know the format of the currently transmitted DCI and does not know which alternative PDCCH the user needs, but knows what information the user currently expects, and for different expected information, the user adopts the corresponding RNTI and the information on the configured alternative PDCCH to perform CRC check, if the CRC check is successful, the user knows that the DCI information is needed by the user and also knows the corresponding DCI format, thereby further analyzing the content of the DCI.

In one possible implementation, the blind detection number calculation rule is as follows:

(1) when the DCI lengths on the alternative PDCCH are different, 1 blind test is calculated separately;

(2) calculating 1 blind detection separately for DCI on an alternative PDCCH (physical downlink control channel) consisting of different Control Channel Elements (CCEs);

(3) the candidate PDCCH is from DCI of control resource sets (CORESET) of different control resource sets, and 1 blind test is calculated separately; wherein, CORESET represents a time-frequency resource set for carrying control information.

(4) And 1 blind detection is calculated when the DCI lengths on the alternative PDCCHs consisting of the same CCE set in the same CORESET are the same.

3. DCI format (DCI format)

For data transmission, NR currently supports 4 formats of DCI, namely DCI format0_0, DCI format0_1DCI format1_0, and DCI format1_ 1.

According to the uplink and downlink, the DCI with the 4 formats may be divided into two types: the DCI for scheduling a Physical Uplink Shared Channel (PUSCH) and the DCI for scheduling a Physical Downlink Shared Channel (PDSCH), where DCI format0_0 and DCI format0_1 are DCIs for scheduling a PUSCH, and DCI format1_0 and DCI format1_1 are DCIs for scheduling a PDSCH.

According to specific functions, the DCI with the 4 formats may be divided into two categories: fallback DCI (fallback DCI) and non-fallback DCI (non-fallback DCI), wherein DCI format0_0 and DCI format1_0 are fallback DCI, and DCIformat0_ 1 and DCI format1_1 are non-fallback DCI. It should be understood that different formats of DCI contain different field contents and corresponding DCI bit widths.

In a Radio Resource Control (RRC) reconfiguration process, there may be a period of time during which the network device and the terminal device understand inconsistency with respect to the effective time of the new configuration, and during the period of time, the network device may send a fallback DCI to the terminal device for data scheduling, so as to avoid the network device and the terminal device understanding inconsistency with respect to the RRC configuration. In other words, if the network device does not configure the transmission mode for the terminal device through the higher layer signaling, it is mainly the time period after the initial access until the RRC configuration is completed and valid. Since the terminal device cannot receive any configuration information indicated by the RRC signaling in this period of time, the protocol needs to predefine a transmission mechanism, i.e., single port transmission based on fallback DCI scheduling, mainly because the transmission mechanism does not depend on the RRC signaling, and the data transmission can be completed by indicating parameters required for transmission through the DCI signaling.

It should be understood that the aforementioned fallback DCI and non-fallback DCI are only names used for distinguishing two types of DCI with different functions, and may also be described by using other names, which are not limited in this embodiment of the present application.

In a possible implementation manner, the formats of the 4 DCI formats may be respectively shown in the following table:

table one DCI format0_0

In the DCI format0_0, the lengths of the remaining fields are fixed except for the FDRA field, and it is not necessary to configure the fields by RRC signaling, and therefore, the information bit size of the DCI format0_0 is only related to the FDRA field, and the FDRA field of the DCI format0_0 is only related to the FDRA field

Is related to the value of (A).

Table two DCI format0_1

In the DCI format0_1, the lengths of many fields other than the FDRA field are not fixed, and need to be configured through RRC signaling, for example, a carrier indicator bit, a bandwidth part indicator, a time domain resource allocation bit, and the like. Therefore, the information bit size of DCIformat0_ 1 is not only the same as

Is flexibly variable.

Table III DCI format1_0

The DCI format1_0 is a DCI format scrambled by C-RNTI and the FDRA fields are not all 1, or a DCI format scrambled by CS-RNTI. In the DCI format1_0, the lengths of the remaining fields are fixed except for the FDRA field, and it is not necessary to configure the fields by RRC signaling, and therefore, the information bit size of the DCI format0_1 is related only to the FDRA fieldThe FDRA field of DCI format0_1 is only associated with

Is related to the value of (A).

TABLE FOUR DCI Format1_1

In the DCI format1_1, the lengths of many fields other than the FDRA field are not fixed, and need to be configured through RRC signaling, for example, a carrier indication bit, a bandwidth part indication, a time domain resource allocation bit, and the like. Therefore, the information bit size of DCIformat _1 is not only the same as that of DCIformat _1

Is flexibly variable.

In summary, in the fallback DCI, except for the FDRA field, the bit length and the content of each field are not affected by the RRC configuration, and are determined. Therefore, the length of only the FDRA field affecting the fallback DCI bit length, specifically, the parameter affecting the length of the DCI format0_0 is

The parameter affecting the length of the DCI format1_0 is

While

The initial UL bwp may be used, the active UL bwp may be used, and similarly,

either initial downlink BWP or initial downlink BWP may be employedThe downlink BWP is activated, depending on the scene corresponding to the DCI, for example, Common Search Space (CSS) or user-specific search space (USS), which results in DCI format0_0 and DCI format1_0 having two lengths, respectively.

4. DCI Length budget (DCI size budget)

The DCI length budget needs to satisfy the following two criteria at the same time, namely:

(1) different DCI lengths in 1 time slot in 1 cell do not exceed 4;

(2) the length of the different DCI scrambled by the C-RNTI monitored in 1 time slot in 1 cell is not more than 3.

Table five and table six show different scenes

And

the value of (a).

Table five DCI format0_0

TABLE six DCI format1_0

Specifically, for DCI format0_0, in CSS, in FDRA domainAdopting initial UL BWP calculation, in USS, if DCI length budget is satisfied, in FDRA domainUsing active UL BWP calculation, if not satisfying DCI length budget, in FDRA domain

Initial UL BWP calculation was used. For DCI format0_1, in CSS, in FDRA domain

Adopting initial DL BWP calculation, in USS, if DCI length budget is satisfied, in FDRA domain

Active DL BWP calculation is adopted, if not meeting DCI length budget, in FDRA domain

Initialldl BWP computation is used.

The network device may also send DCI of other formats to the terminal device within 1 slot, for example, DCI format0_1 of C-RNTI scrambled CRC, DCI format1_1 of C-RNTI scrambled CRC, DCI format 2_0 of SFI-RNTI scrambled CRC, DCI format 2_1 of INT-RNTI scrambled CRC, and the like. In order to avoid the high blind detection complexity of the terminal device in 1 timeslot, the network device and the terminal device need to align the lengths of DCI format0_0 and DCI format1_ 0in the CSS and the USS according to the DCI length budget.

In a possible implementation manner, in 1 timeslot, the network device needs to send 2 DCIs with different lengths to the terminal device, which are DCI format0_1 of C-RNTI scrambled CRC and DCI format1_1 of C-RNTI scrambled CRC, respectively. At this time, since the DCI of other formats occupies a part of the DCI length budget, the length budget for transmitting DCI of different lengths scrambled by C-RNTI remains 2, and the length budget for transmitting DCI of different lengths remains 1, because two conditions are satisfied simultaneously, the DCI length budget remains 1. If the DCI format0_0 and the DCI format1_0 are to be transmitted in the CSS and the USS, the two different lengths of DCI need to be aligned to one length of DCI by an alignment rule.

5. Frequency domain resource allocation FDRA domain

The frequency domain resource allocation is divided into a resource allocation type 0 and a resource allocation type 1, wherein the resource allocation type 0 does not support frequency hopping, and the resource allocation type 1 is divided into two situations of supporting frequency hopping and not supporting frequency hopping. Therefore, the network device may indicate whether frequency hopping is supported to the terminal device through a frequency hopping flag (frequency hopping flag) in Downlink Control Information (DCI).

Specifically, if the frequency hopping flag bit indicates that frequency hopping is supported, a frequency domain resource allocation indication (FDRA) field of the DCI is composed of two parts, i.e., a frequency hopping offset indication bit (the frequency offset) and an actual frequency domain resource allocation indication bit (frequency domain resource allocation), wherein 1bit or 2bits of a highest bit indicate a size of a frequency hopping offset, and the remaining number of bits indicates resource allocation. If the frequency hopping flag bit indicates that frequency hopping is not supported, the whole frequency domain allocation indication field indicates resource allocation without a frequency hopping offset indication bit.

Since there may be a frequency hopping offset indication bit in the FDRA domain, the actual frequency domain resource allocation indication bit represents a bit actually used for indicating frequency domain resource allocation in the FDRA domain, except for the frequency hopping offset indication bit. It should be understood that, in this application, only to distinguish the bits actually used for indicating the frequency domain resource allocation in the "frequency domain resource allocation FDRA field" from the bits actually used for indicating the frequency domain resource allocation in the "frequency domain resource allocation FDRA field", the bits may also have other names, and the embodiments of this application do not limit this.

In one possible implementation manner, the number of bits of the FDRA field of the DCI format0_0 is

Wherein, the bit number of the frequency hopping offset indicating bit is N_{UL_hop}When the hopping offset indicator bit indicates 2 hopping offsets, N_{UL_hop}When the hopping offset indicator bit indicates 4 hopping offsets, N is 1_{UL_hop}2. Except for the N of the hopping offset indicator bits_{UL_hop}Remaining in the FDRA field except for bits

One bit is used to indicate the actual frequency domain resource allocation, i.e. the "actual frequency domain resource allocation indicator bit" herein.

Because there are a plurality of DCIs with different lengths, in the process of transmitting the DCIs by the network device and the terminal device, the FDRA domains of the DCIs with different lengths may need to be truncated, so that the DCIs with different lengths can be aligned, the number of the DCIs with different lengths is reduced, and the complexity of blind detection of the DCIs by the terminal device is reduced. The currently adopted method is to intercept from the highest bit of the FDRA field of the DCI, and as a truncation operation is executed, all or part of bits of the hopping offset indication bit in the DCI are intercepted, such an operation is not flexible enough, and the terminal device cannot know whether to execute the hopping operation.

In view of this, the present application provides a new method for transmitting downlink control information, which can reduce the complexity of blind detection on DCI by a terminal device.

Fig. 2 shows a schematic flow chart of a method 200 for transmitting downlink control information according to an embodiment of the present application. The method 200 may be applied to the communication system 100 shown in fig. 1, but the embodiment of the present application is not limited thereto.

S210, a network side device sends first configuration information to a terminal side device, wherein the first configuration information is used for configuring a search space, and correspondingly, the terminal side device receives the first configuration information sent by the network side device;

s220, the network side equipment sends the first DCI and/or the second DCI to the terminal side equipment;

s230, the terminal side device detects the first DCI and the second DCI in the search space configured by the first configuration information according to the first configuration information, where the first DCI includes:

a first field and a truncated second field; or

The first field and the second field being truncated; or

The first field being truncated and the second field being truncated;

wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

It should be understood that the terminal-side device in the embodiment of the present application may be a terminal device that is sold independently, or may also be a chip in the terminal device, and the network-side device may be a network device that is sold independently, or may also be a chip in the network device, which is not limited in this embodiment of the present application.

Specifically, the network side device may send, to the terminal side device, first configuration information for configuring the search space, where the first configuration information may be sent by the network side device to the terminal side device through a higher layer signaling. Then, the terminal side device may detect DCI transmitted by the network side device in the search space configured by the first configuration information. The terminal side device does not know the format of the DCI currently transmitted by the network side device, nor which alternative PDCCH the DCI required by the terminal side device is on, but the terminal side device knows the information expected by the terminal side device. Therefore, the terminal side device can perform blind detection. In a possible implementation manner, the terminal side device uses the RNTI corresponding to the DCI format expected by itself and the configured information on the candidate PDCCH to perform CRC check, and if the CRC check is successful, the terminal side device knows that the DCI information is required by itself and also knows the corresponding DCI format, so as to further analyze the content of the DCI.

In order to reduce the blind detection complexity of the terminal side device, the network side device needs to perform truncation operation on the DCI with the longer length in the two types of DCI with different lengths, so as to ensure that the DCI with one type of length is sent. Specifically, the first DCI is DCI generated after the network side device performs the puncturing operation, and the bit number of the first DCI is the same as the bit number of the second DCI.

The network side device may generate the first DCI through different operation modes, so that a plurality of situations may exist in a field of the first DCI, which is not limited in this embodiment of the present invention. As an alternative embodiment, the number of bits of the truncated first field is greater than 0, and the number of bits of the truncated second field is equal to or greater than 0.

The truncation may refer to deleting a part of information bits of the corresponding field, or deleting all information bits of the corresponding field. In the embodiment of the present application, a first field for indicating resource allocation may be truncated with a part of information bits, and a second field for indicating a hopping frequency offset may be truncated with all or a part of information bits. The network side device may adopt different operation modes, for example, the second field for indicating the frequency hopping offset is truncated by all or part of the information bits, that is, the first DCI includes the first field and the truncated second field; for another example, the first field for indicating resource allocation is truncated by a partial information bit, i.e., the first DCI includes the truncated first field and the second field; for another example, a first field for indicating resource allocation and a second field for indicating a hopping offset are truncated, wherein the first field is truncated by a part of information bits, and the second field is truncated by all or a part of information bits, i.e., the first DCI includes the truncated first field and the truncated second field.

Optionally, the terminal side device may parse (decode) the first DCI after detecting that the first DCI is the DCI required by the terminal side device. Specifically, the terminal side device may determine, according to an operation performed by a network side device, which of the three cases is included in the first DCI, that is, the first DCI includes a first field and a truncated second field, or the first DCI includes the truncated first field and the truncated second field.

The terminal side device may further determine the bit number of the second field, so as to determine whether the second field is completely intercepted. And under the condition that the bit number of the truncated second field is greater than 0, not intercepting all the second fields used for indicating the frequency hopping offset, determining that the frequency hopping operation needs to be performed on the downlink data by the terminal side equipment, and further determining the frequency hopping offset according to the second fields. When the number of bits of the truncated second field is equal to 0, all information bits of the second field indicating the frequency hopping offset are truncated, and at this time, even if the frequency hopping flag indicates frequency hopping, the terminal side device may not perform a frequency hopping operation on downlink data, that is, may directly parse the first field in the first DCI.

It should be understood that "field" herein denotes several bits having a certain physical meaning, and a plurality of fields may constitute one domain. In a possible implementation manner, the first field in this embodiment may be a frequency domain resource allocation indication bit (frequency domain resource allocation) in the DCI, the second field may be a frequency hopping offset indication bit (the frequency offset), and the first field and the second field may constitute a frequency domain resource allocation indication (FDRA) field in the DCI, which is not limited in this embodiment.

As an optional embodiment, the method further comprises: the network side device determines that the first DCI includes the first and second truncated fields when at least one of the following conditions is satisfied, and correspondingly, the terminal side device determines that the first DCI includes the first and second truncated fields when at least one of the following conditions is satisfied:

the number of bits by which the first field is truncated is less than or equal to a first threshold;

the number of bits of the truncated first field is greater than a second threshold;

the bandwidth of the initial uplink bandwidth part is larger than a third threshold value;

and the network side equipment configures the terminal side equipment for transmission precoding through high-level signaling.

The network device and the terminal device need to have the same understanding on the truncating operation, so that the terminal device can ensure that the terminal device has correct understanding when receiving the DCI after the network device performs the truncating operation on the DCI, otherwise, field analysis errors of the DCI can be caused. Specifically, the network side device may determine whether to perform the puncturing operation on the second field according to at least one of the truncated bit number of the first field, the bandwidth of the initial uplink bandwidth portion, and information, such as whether the network side device configures a terminal side device to perform transmission precoding (transform precoder). Correspondingly, the terminal side device may determine a field included in the first DCI according to at least one of the above information. Therefore, the terminal side equipment and the network side equipment can judge according to the same information, so that the understanding of the terminal side equipment and the understanding of the network side equipment are consistent, and errors are not easy to occur.

If the bit number of the first field is shortened is smaller than or equal to the first threshold, it indicates that the network side device does not shorten the second field. In other words, if the bit number of the truncated first field is greater than the second threshold, it indicates that the network side device does not truncate the second field.

And if the bandwidth of the initial uplink bandwidth part is larger than the third threshold, indicating that the network side equipment does not truncate the second field and reserving the frequency hopping bit. This is because when the bandwidth of the initial uplink bandwidth part is large enough, it can be guaranteed that the frequency hopping can bring a certain diversity gain, otherwise, the bandwidth of the initial uplink bandwidth part is not large enough, and it is meaningless that the frequency hopping gain is too small.

If the network side equipment configures the terminal side equipment for transmission precoding through the high-level signaling, the network side equipment does not truncate the second field.

Specifically, the function of the transmission pre-coder is to perform Discrete Fourier Transform (DFT) on data subjected to layer mapping (layer mapper) in the physical layer process to convert the data into frequency domain data. The DFT disperses the uplink data over the entire frequency domain, thereby reducing the peak to average power ratio (PAPR) of the signal.

In one possible implementation, the specific form of applying the transmission precoding to the data may be as follows:

a group of complex-valued symbols can be obtained through transmission precoding

In the above-mentioned formula, the compound of formula,

indicating the number of modulation symbols on each layer; l represents the l-th OFDM symbol;

indicating how many subcarriers the PUSCH is sent to;

the number of subcarriers in 1 Resource Block (RB) is represented, and the value is 12;

indicates the bandwidth for transmitting PUSCH, and satisfies the following conditions in RB

α therein₂,α₃,α₅Is a set of non-zero integers.

It should be understood that when the network side device configures the terminal side device transmission precoding (transformformer) enable (enable) through higher layer signaling, the uplink transmission of the terminal side device will use a discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) waveform.

When the network side device configures the transmission precoding enable, the network side device may reserve the hopping bits, otherwise, the hopping bits may be intercepted. In other words, when the DFT-s-OFDM waveform is used on the initial uplink bandwidth portion, the network side device may retain the hopping bits, and may intercept the hopping bits otherwise. This is because when the DFS-s-OFDM waveform is used on the initial uplink bandwidth portion, the uplink coverage of the terminal-side device is limited, enabling frequency hopping can guarantee the uplink coverage.

It should be understood that the uplink coverage is limited because the dynamic range of a general power amplifier is limited, and a signal with a large peak-to-average ratio easily enters a nonlinear region of the power amplifier, so that nonlinear distortion is generated on the signal, significant spectrum spreading interference and in-band signal distortion are caused, and the performance of the whole system is seriously reduced. Therefore, in order to ensure that the terminal-side device operates in the linear region, extra power is required for power backoff, resulting in reduced power for coverage.

As an optional embodiment, the first DCI is generated by any one of the following operation modes:

a truncated mode of operation starting from the most significant bit of the first field;

a truncated mode of operation starting from the most significant bit of the second field;

truncating the partial information bits of the second field and then starting the operation mode of truncation from the highest bit of the first field.

Specifically, the network side device may truncate from the highest bit of the first field, may truncate from the highest bit of the second field, and may truncate the partial information bit of the second field first and then truncate from the highest bit of the first field. It should be understood that the second field precedes the first field.

For modes of operation where puncturing starts from the highest bit of the first field, the second field is always present and not punctured, i.e. the first DCI comprises the first and second fields that are punctured.

For the operation mode of puncturing from the highest bit of the second field, the first field may or may not be punctured, but if the first field is punctured, it is proved that the second field is completely punctured, the bit number of the punctured second field is 0, i.e. the first DCI includes the first field and the punctured second field, or the first DCI includes the punctured first field and the punctured second field.

For the operation mode of truncating the partial information bits of the second field first and then truncating from the highest bit of the first field, the second field is partially truncated, the number of bits of the truncated second field is greater than 0, the first field may be truncated or not truncated, and then the first DCI includes the first field and the truncated second field, or the first DCI includes the truncated first field and the truncated second field.

Therefore, the network side equipment can adopt the different operations according to different requirements, and the flexibility of transmitting the downlink control information is greatly improved.

As an optional embodiment, the method further comprises:

the network side equipment sends second configuration information to the terminal side equipment, wherein the second configuration information indicates the operation mode adopted by the first DCI, and correspondingly, the terminal side equipment receives the second configuration information sent by the network side equipment;

the detecting, by the terminal-side device, the first DCI and the second DCI in the search space according to the first configuration information includes:

and the terminal side equipment detects the first DCI and the second DCI in the search space according to the first configuration information and the second configuration information.

Specifically, the network side device may send the second configuration information to the terminal side device to indicate an operation manner adopted for the first DCI, where the operation manner may specifically be any one of the three operation manners. After receiving the high-level signaling, the terminal side device may perform blind detection according to an operation mode configured by the network side device. Optionally, the second configuration information may be sent by the network side device to the terminal side device through a higher layer signaling.

Taking the first DCI before being truncated as DCI format0_0 and the second DCI as DCI format1_0 as an example, assuming that the length of DCIformat0_0 is greater than that of DCI format1_0, in the process of aligning the length of DCI format0_0 to DCI format1_0, the network side device needs to intercept the FDRA field of DCI format0_0, where the intercepted bit length is the difference between the length of DCIformat0_0 and the length of DCI format1_ 0.

Next, referring to fig. 3 to fig. 6, a method for transmitting downlink control information according to the present invention will be described in detail by taking an example that the hopping offset indicator bit is 2 bits. It should be understood that the hopping offset indication bit corresponds to the second field and the actual frequency domain resource allocation indication bit corresponds to the first field.

Example one

In this embodiment, the network device intercepts from the highest order bits of the FDRA domain, so that both the fig. 3 and fig. 4 results are possible.

As shown in fig. 3, if only 1bit needs to be intercepted, the indication bit of the frequency hopping offset after the interception operation is completed remains 1bit, and then the terminal device can perform frequency hopping according to the size indicated by the frequency hopping offset indicated by the 1bit when sending uplink data. In this case, the network device configures 4 hopping offsets for the terminal through high-level signaling, and the hopping offset indicator bit is 2 bits. When a bit is truncated, the network device can only indicate 2 hopping offsets from the 4 hopping offsets through the truncated DCI.

In a possible implementation manner, the 2bits may indicate 00, 01, 10, and 11, which correspond to the 4 hopping offsets, respectively. When the network device cuts 1bit from the most significant bit, the remaining 1bit can only indicate 0 and 1. At this time, the network device and the terminal device may default the previous value to 0 or 1, which results in 00 and 01, or 10 and 11, which respectively indicate 2 hopping offsets of the 4 hopping offsets.

As shown in fig. 4, the hopping offset indicator bits are truncated, and only 2-bit hopping offset indicator bits may be truncated, or a part of actual frequency domain resource allocation indicator bits are truncated in addition to the 2-bit hopping offset indicator bits, in this case, the terminal device does not perform the hopping operation when transmitting the uplink data.

Example two

In this embodiment, the network device always reserves the hopping offset indication bit, and truncates from the highest bit of the actual frequency domain resource allocation indication bit only until aligning with the length of the DCI format1_ 0.

As shown in fig. 5, no matter how many bits need to be intercepted, the network device always truncates from the highest bit of the actual frequency domain resource allocation indicating bit, so that when the terminal device sends uplink data, the frequency modulation operation can always be performed according to the 4 frequency modulation offsets indicated by the frequency modulation offset indicating bit.

EXAMPLE III

In this embodiment, the network device intercepts the 1-bit frequency hopping offset indicator bit, retains the 1-bit frequency hopping offset indicator bit, and starts truncation from the highest bit of the actual frequency domain resource allocation indicator bit if truncation is to be continued.

As shown in fig. 6, the network device performs an interception operation on both the frequency hopping offset indicator bit and the actual frequency domain resource allocation indicator bit, and the frequency hopping offset indicator bit is changed from 2bits to 1bit, so that the terminal device can perform frequency hopping according to the size indicated by the frequency hopping offset indicated by 1bit when transmitting uplink data. In the same embodiment one, the network device needs to select 2 of the 4 hopping offsets configured for the terminal.

It should be understood that the truncating operations corresponding to the above three embodiments may be protocol agreed, or at least one of the truncating operations may be configured to the terminal-side device by the network-side device through high-layer information.

In another possible implementation manner, the network-side device and the terminal-side device may determine whether to use the puncturing operation corresponding to the embodiment two (or the embodiment three) according to any one of the following conditions:

1. for the bit number intercepted from the FDRA domain, if the bit number intercepted from the FDRA domain is larger than a certain preset threshold, adopting the corresponding truncation operation of the second embodiment (or the third embodiment), and otherwise, adopting the corresponding truncation operation of the second embodiment;

2. if the number of bits remaining after the FDRA domain is truncated is smaller than a preset threshold, adopting the truncation operation corresponding to the second embodiment (or the third embodiment), and otherwise, adopting the corresponding truncation operation corresponding to the third embodiment;

3. and if the bit number of the actual frequency domain resource allocation indicating bits after the FDRA domain is truncated is smaller than a certain preset threshold, adopting the truncation operation corresponding to the second embodiment (or the third embodiment), and otherwise, adopting the truncation operation corresponding to the second embodiment.

4. If the bandwidth of the initial uplink bandwidth part is greater than a certain preset threshold, adopting the truncating operation corresponding to the second embodiment (or the third embodiment), and otherwise, adopting the truncating operation corresponding to the third embodiment;

5. and if the transmission precoding is enabled, if the network side equipment is configured to enable the transmission precoding, adopting the puncturing operation corresponding to the second embodiment (or the third embodiment), and otherwise, adopting the puncturing operation corresponding to the third embodiment.

According to the method for transmitting the downlink control information, the network side equipment generates the first DCI with the same bit number as the second DCI in different operation modes, the blind detection complexity of the terminal side equipment is reduced, the flexibility is high, and the network side equipment and the terminal side equipment can be guaranteed to be consistent in understanding.

For fallback DCI, FDRA domains

And

the values are different, and the DCI lengths are also different, which may be specifically referred to in table five and table six. In view of this, the present application provides another method for transmitting downlink control information, which can reduce the complexity of blind detection on DCI by a terminal device.

Fig. 7 is a schematic flow chart of another method 700 for transmitting downlink control information according to an embodiment of the present application. The method 700 may be applied to the communication system 100 shown in fig. 1, but the embodiment of the present application is not limited thereto.

S710, the network side device determines search spaces of the first downlink control information DCI, the second DCI, the third DCI, and the fourth DCI;

s720, the terminal side equipment determines the search spaces of the first downlink control information DCI, the second DCI, the third DCI and the fourth DCI;

s730, the network side device transmits at least one of the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space;

s740, the terminal side device detects the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space.

For the method 700, in a possible implementation manner, the first DCI has the same bit number as the second DCI through a zero padding operation or a puncturing operation, the third DCI has the same bit number as the second DCI through the zero padding operation or the puncturing operation, and the fourth DCI has the same bit number as the second DCI through the initial downlink bandwidth part.

In this embodiment of the present application, the bit numbers of the first DCI, the second DCI, the third DCI, and the fourth DCI are the same, so that the terminal side device may blindly detect the DCI according to a certain length in the search space configured by the network side device.

It should be understood that, the third DCI is generated by activating the uplink bandwidth part before the zero padding operation or the puncturing operation is not performed, and since the third DCI needs to be aligned with the second DCI, the network side device may replace the activated uplink bandwidth part therein with the initial uplink bandwidth part, and then perform the zero padding operation or the puncturing operation on the replaced DCI to generate the third DCI. Similarly, the fourth DCI is generated by activating the downlink bandwidth part before the zero padding operation or the puncturing operation is not performed, and the network side device may directly replace the activated downlink bandwidth part with the initial downlink bandwidth part to generate the fourth DCI because the fourth DCI needs to be aligned with the second DCI.

According to the method for transmitting the downlink control information, the network side equipment aligns the DCI, and the terminal side equipment detects the DCI in the corresponding search space in the same manner, so that the blind detection complexity of the terminal side equipment on the DCI can be reduced, and the system performance is improved.

As an alternative embodiment, the first DCI is DCI format0_ 0in Common Search Space (CSS);

the second DCI is DCI format1_ 0in the CSS;

the third DCI is DCIformat0_ 0in a user-specific search space (USS);

the fourth DCI is DCI format1_ 0in the USS.

Specifically, the terminal side device performs blind detection on the DCI in the different formats in the search space. The search space defines the starting position of the blind test and the channel search mode, and can be divided into a common search space CSS and a user-specific search space USS. The CSS is a group of terminal-side devices or all terminal-side devices in the same cell that need to be detected, and the USS is specific to a specific terminal-side device.

For the method 700, in another possible implementation manner, the first DCI has the same bit number as the second DCI through a zero padding operation or a puncturing operation, and the third DCI has the same bit number as the fourth DCI through the zero padding operation and the partial generation according to the activated uplink bandwidth.

In this embodiment, the bit numbers of the first DCI and the second DCI are the same, and the bit numbers of the third DCI and the fourth DCI are the same, so that the terminal side device may blindly detect the DCI according to two lengths in the search space configured by the network side device.

It should be understood that the number of bits of the third DCI before the zero padding operation or the puncturing operation is not performed is smaller than that of the fourth DCI, and therefore, the number of bits of the third DCI and the fourth DCI can be guaranteed to be the same only by performing the zero padding operation on the third DCI.

As an alternative embodiment, the first DCI is DCI format0_ 0in common search space CSS;

the second DCI is DCI format1_ 0in the CSS;

the third DCI is DCI format0_ 0in a user-specific search space USS;

the fourth DCI is DCI format1_ 0in the USS.

The following describes a method for transmitting downlink control information according to the present application in detail by using a specific embodiment. Wherein the first DCI is DCI format0_ 0in CSS, the second DCI is DCI format1_ 0in CSS, and the third DCI is DCI format0_ 0in USS(s) (0 _ 0)

The calculation of the activated uplink bandwidth part) is adopted, the fourth DCI is DCI format1_ 0in the USS (downlink shared information service) (DCI format _ 0)With activated downlink bandwidth portion calculation).

Example four

The network side equipment sends configuration information of the downlink control information to the terminal side equipment, wherein the configuration information comprises a search space, a resource control set and the like. After receiving the configuration information, the terminal side device may determine which specific RNTI scrambled DCI formats and DCI lengths are monitored in which time slots according to the configuration information.

In a given transmission time unit (for example, a time slot in NR), the terminal side device determines the number of the remaining DCI length budgets according to the specific DCI format and DCI length scrambled by all the specific RNTIs to be monitored by the DCI length budget rule, and then determines the DCI blind detection mode.

Before sending the DCI, the network side device may perform the following alignment operation on the above four kinds of DCI in two cases.

Case one, when there is only one DCI length budget:

1. the network side equipment aligns the length of the first DCI to the length of the second DCI;

2. the network side equipment changes the FDRA domain calculation of the third DCI from the activated uplink bandwidth part to the initial uplink bandwidth part, and then aligns the length of the second DCI;

3. the network side equipment changes the FDRA domain calculation of the fourth DCI from the activated downlink bandwidth part to the initial downlink bandwidth part, so that the length of the aligned fourth DCI is the same as that of the second DCI.

In this way, when determining that there is only one DCI length budget, the terminal side device may detect the first DCI, the second DCI, the third DCI, and the fourth DCI according to one length (i.e., the length of the second DCI).

Case two, when there are only two DCI length budgets:

2. and the network side equipment aligns the length of the third DCI and the length of the fourth DCI to the length of the longer DCI.

In this way, when determining that there is only one DCI length budget, the terminal side device may detect the first DCI, the second DCI, the third DCI, and the fourth DCI according to two lengths (i.e., the length of the second DCI and the longer length of the third DCI and the fourth DCI).

EXAMPLE five

The network side device and the terminal side device may meet the following two determination conditions at the same time according to the definition of DCI length budget:

(1) different DCI lengths in 1 time slot in 1 cell do not exceed 4;

(2) different DCI lengths which are monitored in 1 time slot in 1 cell and are scrambled by C-RNTI do not exceed 3; and determining the alignment mode of the DCI.

The network side device and the terminal side device may first determine the number of the remaining DCI length budgets according to the CSS. Specifically, assuming that DCI format 2_0, DCI format0_0, and DCI format0_1 exist, CSS DCI format0_0 and CSS DCI format0_1 are aligned, accounting for 2 length budgets and 1 length budget of C-RNTI in total.

The network side device and the terminal side device may determine the number of the remaining DCI length budgets according to the USS.

In case one, the USS DCI format0_1 and the USS DCI format1_1 have the same length, and occupy the length budgets of 1 length budget and 1C-RNTI, and only leave the length budgets of 1 length budget and 1C-RNTI.

Therefore, the USS DCI format0_0 and the USS DCI format1_0 can output only 1 length in total. Assuming that the DCI length budget is satisfied, all operations satisfying the budget condition are performed, that is, the FDRA field of the USS DCI format0_0 adopts the active BWP, the FDRA field of the USS DCI format1_0 adopts the active BWP, and the two DCIs are aligned to a longer length, and then 1 new length is output.

In case two, the USS DCI format0_1 and the USS DCI format1_1 have different lengths, and occupy the length budgets of 2 length budgets and 2C-RNTIs, and only leave the length budgets of 0 length budget and 0C-RNTI:

in this case, 2 DCIs in the USS together cannot output one DCI length different from the previous one.

Assuming that the DCI size budget is satisfied, all operations satisfying the budget condition, i.e., USS 0_0active and USS1_0active, are completed first, and 2 DCIs in the USS are aligned to the length, and at this time, 1 length is output. After judging whether the budget condition is met, USS 0_0initial UL, USS1_ 0initial DL and USS 0_0initial UL are pulled to CSS 1_0initial DL to be aligned.

It should be understood that the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The method for transmitting downlink control information according to the embodiment of the present application is described in detail above with reference to fig. 1 to 7, and the apparatus for transmitting downlink control information according to the embodiment of the present application is described in detail below with reference to fig. 8 to 9.

Fig. 8 shows a device 800 for transmitting downlink control information according to an embodiment of the present application, where the device 800 may be a terminal device or a chip in the terminal device, and the device may be a network device or a chip in the network device. The apparatus 800 comprises: a transceiving unit 810 and a processing unit 820.

In one possible implementation manner, the apparatus 800 is configured to execute the respective flows and steps corresponding to the terminal-side device in the method 200.

The transceiver unit 810 is configured to: receiving first configuration information sent by network side equipment, wherein the first configuration information is used for configuring a search space; the processing unit 820 is configured to: detecting first Downlink Control Information (DCI) and second DCI in the search space according to the first configuration information, the first DCI including: a first field and a truncated second field; or the first field and the second field being truncated; or the first field being truncated and the second field being truncated; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

Optionally, the number of bits of the truncated first field is greater than 0, and the number of bits of the truncated second field is equal to or greater than 0.

Optionally, the processing unit 820 is further configured to: determining that the first DCI includes the first field and the second field that are truncated when at least one of the following conditions is met: the number of bits by which the first field is truncated is less than or equal to a first threshold; the number of bits of the truncated first field is greater than a second threshold; the bandwidth of the initial uplink bandwidth part is larger than a third threshold value; and the network side equipment configures the terminal side equipment for transmission precoding through high-level signaling.

Optionally, the first DCI is generated by any one of the following operation modes: a truncated mode of operation starting from the most significant bit of the first field; a truncated mode of operation starting from the most significant bit of the second field; truncating the partial information bits of the second field and then starting the operation mode of truncation from the highest bit of the first field.

Optionally, the transceiver unit 810 is further configured to: receiving second configuration information sent by the network side device, where the second configuration information indicates an operation mode adopted for the first DCI; the processing unit 820 is specifically configured to: and detecting the first DCI and the second DCI according to the first configuration information and the second configuration information.

In another possible implementation manner, the apparatus 800 is configured to execute the respective procedures and steps corresponding to the network-side device in the method 200.

The transceiver unit 810 is configured to: sending first configuration information to terminal side equipment, wherein the first configuration information is used for configuring a search space; sending first Downlink Control Information (DCI) and/or second DCI to terminal side equipment, wherein the first DCI comprises: a first field and a truncated second field; or the first field and the second field being truncated; or the first field being truncated and the second field being truncated; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

Optionally, the processing unit 820 is configured to: determining that the first DCI includes the first field and the second field that are truncated when at least one of the following conditions is met: the number of bits by which the first field is truncated is less than or equal to a first threshold; the number of bits of the truncated first field is greater than a second threshold; the bandwidth of the initial uplink bandwidth part is larger than a third threshold value; and the network side equipment configures the terminal side equipment for transmission precoding through high-level signaling.

Optionally, the transceiver unit 810 is further configured to: and second configuration information is sent to the terminal side device, and the second configuration information indicates an operation mode adopted by the first DCI.

In another possible implementation manner, the apparatus 800 is configured to execute the respective flows and steps corresponding to the terminal-side device in the method 700.

The processing unit 820 is configured to determine search spaces of the first downlink control information DCI, the second DCI, the third DCI, and the fourth DCI; the processing unit 820 is further configured to: detecting the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; the first DCI has the same bit number as the second DCI through zero padding operation or truncation operation, the third DCI has the same bit number as the second DCI through zero padding operation or truncation operation, and the fourth DCI has the same bit number as the second DCI through zero padding operation or truncation operation according to the initial downlink bandwidth part.

In another possible implementation manner, the apparatus 800 is configured to execute the respective procedures and steps corresponding to the network-side device in the method 700.

The processing unit 820 is configured to determine search spaces of the first downlink control information DCI, the second DCI, the third DCI, and the fourth DCI; the transceiver 810 is configured to transmit at least one of the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; the first DCI has the same bit number as the second DCI through zero padding operation or truncation operation, the third DCI has the same bit number as the second DCI through zero padding operation or truncation operation, and the fourth DCI has the same bit number as the second DCI through zero padding operation or truncation operation according to the initial downlink bandwidth part.

Optionally, the first DCI is DCI format0_ 0in common search space CSS; the second DCI is DCI format1_ 0in the CSS; the third DCI is DCI format0_ 0in a user-specific search space USS; the fourth DCI is DCI format1_ 0in the USS.

In another possible implementation manner, the apparatus 800 is configured to execute the respective flows and steps corresponding to another terminal-side device in the method 700.

The processing unit 820 is configured to determine search spaces of the first downlink control information DCI, the second DCI, the third DCI, and the fourth DCI; the processing unit 820 is further configured to: detecting the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; and generating a third DCI according to the activated uplink bandwidth part and performing zero padding operation on the third DCI to obtain a third DCI with the same bit number as the fourth DCI.

In another possible implementation manner, the apparatus 800 is configured to execute the respective procedures and steps corresponding to another network-side device in the method 700.

The processing unit 820 is configured to determine search spaces of the first downlink control information DCI, the second DCI, the third DCI, and the fourth DCI; the transceiver 810 is configured to transmit at least one of the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; and generating a third DCI according to the activated uplink bandwidth part and performing zero padding operation on the third DCI to obtain a third DCI with the same bit number as the fourth DCI.

It should be appreciated that the apparatus 800 herein is embodied in the form of a functional unit. The term "unit" herein may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an optional example, it may be understood by those skilled in the art that the apparatus 800 may be specifically a terminal side device or a network side device in the foregoing embodiment, and the apparatus 800 may be configured to execute each procedure and/or step corresponding to the terminal side device or the network side device in the foregoing method embodiment, and details are not described herein again to avoid repetition.

The apparatus 800 in each of the above schemes has a function of implementing corresponding steps executed by the terminal side device or the network side device in the above method; the functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software comprises one or more modules corresponding to the functions; for example, the transmitting unit may be replaced by a transmitter, the receiving unit may be replaced by a receiver, other units, such as the determining unit, may be replaced by a processor, and the transceiving operation and the related processing operation in the respective method embodiments are respectively performed.

In the embodiment of the present application, the apparatus in fig. 8 may also be a chip or a chip system, for example: system on chip (SoC). Correspondingly, the receiving unit and the transmitting unit may be a transceiver circuit of the chip, and are not limited herein.

Fig. 9 illustrates another apparatus 900 for transmitting downlink control information according to an embodiment of the present application. The apparatus 900 includes a processor 910, a transceiver 920, and a memory 930. Wherein, the processor 910, the transceiver 920 and the memory 930 are in communication with each other through an internal connection path, the memory 930 is used for storing instructions, and the processor 910 is used for executing the instructions stored in the memory 930 to control the transceiver 920 to transmit and/or receive signals.

In one possible implementation manner, the apparatus 900 is configured to execute the respective flows and steps corresponding to the terminal-side device in the method 200.

Wherein the processor 910 is configured to: receiving first configuration information sent by a network side device through the transceiver 920, where the first configuration information is used to configure a search space; detecting first Downlink Control Information (DCI) and second DCI in the search space according to the first configuration information, the first DCI including: a first field and a truncated second field; or the first field and the second field being truncated; or the first field being truncated and the second field being truncated; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

In another possible implementation manner, the apparatus 900 is configured to execute the respective procedures and steps corresponding to the network-side device in the method 200.

Wherein the processor 910 is configured to: transmitting first configuration information to a terminal side device through the transceiver 920, wherein the first configuration information is used for configuring a search space; transmitting first Downlink Control Information (DCI) and/or second DCI to a terminal side device through the transceiver 920, wherein the first DCI includes: a first field and a truncated second field; or the first field and the second field being truncated; or the first field being truncated and the second field being truncated; wherein the first field indicates resource allocation, the second field indicates a frequency hopping offset, and the number of bits of the first DCI is the same as the number of bits of the second DCI.

In another possible implementation manner, the apparatus 900 is configured to execute the respective flows and steps corresponding to the terminal-side device in the method 700.

The processor 910 is configured to determine search spaces of a first downlink control information DCI, a second DCI, a third DCI, and a fourth DCI; the processor 910 is further configured to: detecting the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; the first DCI has the same bit number as the second DCI through zero padding operation or truncation operation, the third DCI has the same bit number as the second DCI through zero padding operation or truncation operation, and the fourth DCI has the same bit number as the second DCI through zero padding operation or truncation operation according to the initial downlink bandwidth part.

The processor 910 is configured to determine search spaces of a first downlink control information DCI, a second DCI, a third DCI, and a fourth DCI; the processor 910 is configured to transmit at least one of the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; the first DCI has the same bit number as the second DCI through zero padding operation or truncation operation, the third DCI has the same bit number as the second DCI through zero padding operation or truncation operation, and the fourth DCI has the same bit number as the second DCI through zero padding operation or truncation operation according to the initial downlink bandwidth part.

The processor 910 is configured to determine search spaces of a first downlink control information DCI, a second DCI, a third DCI, and a fourth DCI; the processor 910 is further configured to detect the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; and generating a third DCI according to the activated uplink bandwidth part and performing zero padding operation on the third DCI to obtain a third DCI with the same bit number as the fourth DCI.

The processor 910 is configured to determine search spaces of a first downlink control information DCI, a second DCI, a third DCI, and a fourth DCI; the transceiver 920 is configured to transmit at least one of the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space; and generating a third DCI according to the activated uplink bandwidth part and performing zero padding operation on the third DCI to obtain a third DCI with the same bit number as the fourth DCI.

It should be understood that the apparatus 900 may be embodied as a terminal side device or a network side device in the foregoing embodiments, and may be configured to perform each step and/or flow corresponding to the terminal side device or the network side device in the foregoing method embodiments. Alternatively, the memory 930 may include a read-only memory and a random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 910 may be configured to execute the instructions stored in the memory, and when the processor 910 executes the instructions stored in the memory, the processor 910 is configured to perform the steps and/or processes of the method embodiments corresponding to the terminal-side device or the network-side device.

It should be understood that in the embodiment of the present application, the processor of the above apparatus may be a Central Processing Unit (CPU), and the processor may also be other general processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software elements in a processor. The software elements may be located in ram, flash, rom, prom, or eprom, registers, among other storage media that are well known in the art. The storage medium is located in a memory, and a processor executes instructions in the memory, in combination with hardware thereof, to perform the steps of the above-described method. To avoid repetition, it is not described in detail here.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Those of ordinary skill in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both, and that the steps and elements of the various embodiments have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially or partially contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting downlink control information, comprising:

the method comprises the steps that terminal side equipment receives first configuration information sent by network side equipment, wherein the first configuration information is used for configuring a search space;

the terminal side device detects first Downlink Control Information (DCI) and second DCI in the search space according to the first configuration information, wherein the first DCI comprises:

a first field and a truncated second field; or

The first field and the second field being truncated; or

The truncated first field and the truncated second field;

2. The method of claim 1, wherein the number of bits of the truncated first field is greater than 0, and wherein the number of bits of the truncated second field is equal to or greater than 0.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

the terminal-side device determines that the first DCI includes the first field and the second field that are truncated when at least one of the following conditions is satisfied:

4. The method according to any of claims 1 to 3, wherein the first DCI is generated by any one of the following modes of operation:

5. The method of claim 4, further comprising:

the terminal side equipment receives second configuration information sent by the network side equipment, wherein the second configuration information indicates an operation mode adopted by the first DCI;

and the terminal side equipment detects the first DCI and the second DCI according to the first configuration information and the second configuration information.

6. A method for transmitting downlink control information, comprising:

the method comprises the steps that network side equipment sends first configuration information to terminal side equipment, wherein the first configuration information is used for configuring a search space;

the network side equipment sends first downlink control information DCI and/or second DCI to terminal side equipment, wherein the first DCI comprises:

a first field and a truncated second field; or

The first field and the second field being truncated; or

The truncated first field and the truncated second field;

7. The method of claim 6, wherein the number of bits of the truncated first field is greater than 0, and wherein the number of bits of the truncated second field is equal to or greater than 0.

8. The method according to claim 6 or 7, characterized in that the method further comprises:

the network side device determines that the first DCI includes the first field and the second field that are truncated when at least one of the following conditions is satisfied:

9. The method according to any of claims 6 to 8, wherein the first DCI is generated by any one of the following modes of operation:

10. The method of claim 9, further comprising:

and second configuration information sent by the network side device to the terminal side device, wherein the second configuration information indicates an operation mode adopted for the first DCI.

11. A method for transmitting downlink control information, comprising:

the terminal side equipment determines search spaces of first Downlink Control Information (DCI), second DCI, third DCI and fourth DCI;

the terminal-side device detecting the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space;

the first DCI has the same bit number as the second DCI through zero padding operation or truncation operation, the third DCI has the same bit number as the second DCI through zero padding operation or truncation operation, and the fourth DCI has the same bit number as the second DCI through zero padding operation or truncation operation according to the initial downlink bandwidth part.

12. A method for transmitting downlink control information, comprising:

the network side equipment determines search spaces of first Downlink Control Information (DCI), second DCI, third DCI and fourth DCI;

the network side device transmits at least one of the first DCI, the second DCI, the third DCI and the fourth DCI in the search space;

13. A method for transmitting downlink control information, comprising:

and generating a third DCI according to the activated uplink bandwidth part and performing zero padding operation on the third DCI to obtain a third DCI with the same bit number as the fourth DCI.

14. A method for transmitting downlink control information, comprising:

15. The method of any of claims 11 to 14, wherein the first DCI is DCI format0_ 0in common search space, CSS;

the second DCI is DCI format1_ 0in the CSS;

the third DCI is DCI format0_ 0in a user-specific search space USS;

the fourth DCI is DCI format1_ 0in the USS.

16. An apparatus for transmitting downlink control information, comprising:

the receiving and sending unit is used for receiving first configuration information sent by network side equipment, and the first configuration information is used for configuring a search space;

a processing unit, configured to detect first downlink control information DCI and second DCI in the search space according to the first configuration information, where the first DCI includes:

a first field and a truncated second field; or

The first field and the second field being truncated; or

The truncated first field and the truncated second field;

17. The apparatus as claimed in claim 16, wherein the number of bits of the truncated first field is greater than 0 and the number of bits of the truncated second field is equal to or greater than 0.

18. The apparatus according to claim 16 or 17, wherein the processing unit is further configured to:

determining that the first DCI includes the first field and the second field that are truncated when at least one of the following conditions is met:

and the network side equipment configures the device for transmission precoding through high-level signaling.

19. The apparatus according to any of claims 16 to 18, wherein the first DCI is generated by any one of the following:

20. The apparatus of claim 19, wherein the transceiver unit is further configured to:

receiving second configuration information sent by the network side device, where the second configuration information indicates an operation mode adopted for the first DCI;

the processing unit is further to:

and detecting the first DCI and the second DCI according to the first configuration information and the second configuration information.

21. An apparatus for transmitting downlink control information, comprising:

the receiving and sending unit is used for sending first configuration information to the terminal side equipment, and the first configuration information is used for configuring a search space;

the transceiver unit is further configured to: sending first Downlink Control Information (DCI) and/or second DCI to terminal side equipment, wherein the first DCI comprises:

a first field and a truncated second field; or

The first field and the second field being truncated; or

The truncated first field and the truncated second field;

22. The apparatus as recited in claim 21, wherein a number of bits of said first field being truncated is greater than 0 and a number of bits of said second field being truncated is equal to or greater than 0.

23. The apparatus of claim 21 or 22, further comprising:

a processing unit configured to determine that the first DCI includes the first field and the second field that are truncated when at least one of the following conditions is satisfied:

the device configures the terminal side equipment for transmission precoding through high-level signaling.

24. The apparatus according to any of claims 21 to 23, wherein the first DCI is generated by any one of the following:

25. The apparatus of claim 24, wherein the transceiver unit is further configured to:

and second configuration information is sent to the terminal side device, and the second configuration information indicates an operation mode adopted by the first DCI.

26. An apparatus for transmitting downlink control information, comprising:

a processing unit, configured to determine search spaces of first downlink control information DCI, second DCI, third DCI, and fourth DCI;

the processing unit is further to: detecting the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space;

27. An apparatus for transmitting downlink control information, comprising:

a transceiver unit configured to transmit at least one of the first DCI, the second DCI, the third DCI, and the fourth DCI in the search space;

28. An apparatus for transmitting downlink control information, comprising:

29. An apparatus for transmitting downlink control information, comprising:

30. The apparatus of any of claims 26 to 29, wherein the first DCI is DCI format0_ 0in common search space, CSS;

the second DCI is DCI format1_ 0in the CSS;

the third DCI is DCI format0_ 0in a user-specific search space USS;

the fourth DCI is DCI format1_ 0in the USS.