CN116470997A

CN116470997A - PDCCH transmission method, terminal and network side equipment

Info

Publication number: CN116470997A
Application number: CN202210028242.6A
Authority: CN
Inventors: 刘殷卉; 李�根
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-01-11
Filing date: 2022-01-11
Publication date: 2023-07-21
Also published as: WO2023134542A1

Abstract

The application discloses a Physical Downlink Control Channel (PDCCH) transmission method, a terminal and network side equipment, which belong to the technical field of communication, and the PDCCH transmission method in the embodiment of the application comprises the following steps: the network side equipment determines a target position of a first complex symbol sequence in a second complex symbol sequence, and places the first complex symbol sequence at the target position in the second complex symbol sequence; the first complex symbol sequence is used for carrying data of a PDCCH; the network side equipment performs DFT or conversion precoding processing on the second complex symbol sequence to obtain a third complex symbol sequence; and the network side equipment maps the third complex symbol sequence to a target time-frequency resource and sends the third complex symbol sequence.

Description

PDCCH transmission method, terminal and network side equipment

Technical Field

The application belongs to the technical field of communication, and particularly relates to a PDCCH transmission method, a terminal and network side equipment.

Background

In order to support higher transmission rate and wider service types, and meanwhile, considering that the frequency resources of the frequency band above 52.6GHz are richer, further research on mobile communication of the frequency band above 52.6GHz is required. In wireless communication, for a certain semiconductor technology, the maximum output power of a radio frequency Power Amplifier (PA) decreases as the frequency of a wireless signal increases. That is, in a high frequency communication system (e.g., fc >52.6 GHz), the maximum output power of the PA is lower than in a medium-low frequency mobile communication system. Therefore, a signal waveform with a low peak-to-average ratio needs to be adopted so as to improve the power amplification efficiency of the PA, thereby ensuring the power of the output signal.

In the 5G NR system, the uplink UL uses a cyclic prefix-orthogonal frequency division multiplexing (Cyclic Prefix Orthogonal Frequency Division Multiplexing, CP-OFDM) waveform or a discrete fourier transform-spread-orthogonal frequency division multiplexing (Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing, DFT-s-OFDM) waveform, and the downlink DL uses a CP-OFDM waveform. The peak-to-average ratio of the DFT-s-OFDM waveform is lower than that of the CP-OFDM waveform. Compared with a single carrier frequency domain equalization (Single Carrier Frequency Domain Equalization, SC-FDE) waveform, the DFT-s-OFDM waveform can allocate different subcarriers for different users, so that multi-user communication is realized. Therefore, how to transmit the physical downlink control channel PDCCH using DFT-s-OFDM waveform in DL in a high frequency communication system is a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

The embodiment of the application provides a PDCCH transmission method, a terminal and network side equipment, which can solve the problem of how to use DFT-s-OFDM waveforms to transmit a physical downlink control channel PDCCH.

In a first aspect, a PDCCH transmission method is provided and applied to a network side device, where the method includes:

the network side equipment determines a target position of a first complex symbol sequence in a second complex symbol sequence, and places the first complex symbol sequence at the target position in the second complex symbol sequence; the first complex symbol sequence is used for carrying data of a PDCCH;

The network side equipment performs DFT or conversion precoding processing on the second complex symbol sequence to obtain a third complex symbol sequence;

and the network side equipment maps the third complex symbol sequence to a target time-frequency resource and sends the third complex symbol sequence.

In a second aspect, a PDCCH transmission method is provided and applied to a terminal, the method includes:

the terminal receives a fourth complex symbol sequence on a target time-frequency resource, and performs Inverse Discrete Fourier Transform (IDFT) or conversion precoding inverse operation on the fourth complex symbol sequence to obtain a fifth complex symbol sequence;

the terminal determines the position sequences of K candidate PDCCHs; the K is an integer greater than 0;

the terminal extracts a sixth complex symbol sequence from the fifth complex symbol sequence based on the position sequences of the K candidate PDCCHs;

the terminal performs blind detection based on the sixth complex symbol sequence.

In a third aspect, a PDCCH transmitting apparatus is provided, including:

a processing module, configured to determine a target position of a first complex symbol sequence in a second complex symbol sequence, and place the first complex symbol sequence at the target position in the second complex symbol sequence; the first complex symbol sequence is used for carrying data of a PDCCH;

Performing DFT or conversion precoding processing on the second complex symbol sequence to obtain a third complex symbol sequence;

and the transmitting module is used for mapping the second complex symbol sequence to the target time-frequency resource and transmitting the second complex symbol sequence.

In a fourth aspect, there is provided a PDCCH transmitting apparatus comprising:

the receiving module is used for receiving a fourth complex symbol sequence on the target time-frequency resource;

the processing module is used for carrying out Inverse Discrete Fourier Transform (IDFT) or conversion precoding inverse operation on the fourth complex symbol sequence to obtain a fifth complex symbol sequence;

the processing module is further used for determining the position sequences of the K candidate PDCCHs; the K is an integer greater than 0;

extracting the sixth complex symbol sequence from the fifth complex symbol sequence based on the position sequences of the K candidate PDCCHs;

blind detection is performed based on the sixth complex symbol sequence.

In a fifth aspect, there is provided a terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method as described in the second aspect.

In a sixth aspect, a terminal is provided, including a processor and a communication interface, where the communication interface is configured to receive a fourth complex symbol sequence on a target time-frequency resource, and perform inverse discrete fourier transform IDFT or inverse transform precoding operation on the fourth complex symbol sequence to obtain a fifth complex symbol sequence; the processor is used for determining a position sequence of K candidate PDCCHs; the K is an integer greater than 0; extracting a sixth complex symbol sequence from the fifth complex symbol sequence based on the position sequences of the K candidate PDCCHs; blind detection is performed based on the sixth complex symbol sequence.

In a seventh aspect, a network side device is provided, comprising a processor and a memory storing a program or instructions executable on the processor, which program or instructions when executed by the processor implement the steps of the method as described in the first aspect.

In an eighth aspect, a network side device is provided, including a processor and a communication interface, where the processor is configured to determine a target position of a first complex symbol sequence in a second complex symbol sequence, and place the first complex symbol sequence at the target position in the second complex symbol sequence; the first complex symbol sequence is used for carrying data of a PDCCH; and performing DFT or conversion precoding processing on the second complex symbol sequence to obtain a third complex symbol sequence, mapping the third complex symbol sequence onto a target time-frequency resource, and transmitting the third complex symbol sequence mapped onto the target time-frequency resource by a communication interface.

In a ninth aspect, there is provided a communication system comprising: a terminal and a network side device, the terminal may be configured to perform the steps of the PDCCH transmission method according to the second aspect, and the network side device may be configured to perform the steps of the PDCCH transmission method according to the first aspect.

In a tenth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor, performs the steps of the method according to the first aspect or performs the steps of the method according to the second aspect.

In an eleventh aspect, there is provided a chip comprising a processor and a communication interface coupled to the processor, the processor being for running a program or instructions to implement the method according to the first aspect or to implement the method according to the second aspect.

In a twelfth aspect, there is provided a computer program/program product stored in a storage medium, the computer program/program product being executed by at least one processor to implement the steps of the PDCCH transmission method of the first or second aspect.

In the embodiment of the application, a network side device determines a target position of a first complex symbol sequence in a second complex symbol sequence, and places the first complex symbol sequence at the target position in the second complex symbol sequence; the first complex symbol sequence is used for carrying data of a PDCCH; performing DFT or conversion precoding processing on the second complex symbol sequence to obtain a third complex symbol sequence, namely a DFT-s-OFDM waveform; the network side equipment maps the third complex symbol sequence to the target time-frequency resource and sends the third complex symbol sequence, and in the scheme, the network side equipment can transmit the PDCCH through the DFT-s-OFDM waveform to obtain a lower peak-to-average power ratio (PAPR), and can improve the power amplification efficiency of the PA, so that the power of an output signal is ensured.

Drawings

Fig. 1 is a block diagram of a wireless communication system to which embodiments of the present application are applicable;

FIG. 2 is one of the system block diagrams of DFT-s-OFDM provided by an embodiment of the present application;

FIG. 3 is one of the schematic diagrams of CORESET provided in the embodiments of the present application;

FIG. 4 is a second schematic illustration of CORESET provided in an embodiment of the present application;

FIG. 5 is a third schematic illustration of CORESET provided in an embodiment of the present application;

fig. 6 is one of flow diagrams of a PDCCH transmission method provided in an embodiment of the present application;

FIG. 7 is a second system block diagram of DFT-s-OFDM provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of a second position index set provided in an embodiment of the present application;

FIG. 9 is a third system block diagram of DFT-s-OFDM provided by an embodiment of the present application;

FIG. 10 is one of the numbering illustrations of the second position index set provided in the embodiments of the present application;

FIG. 11 is a second exemplary numbering scheme of a second position index set according to the present disclosure;

FIG. 12 is a third exemplary numbering scheme of a second position index set according to the present disclosure;

fig. 13 is a second flowchart of a PDCCH transmission method according to an embodiment of the present application;

fig. 14 is one of schematic structural diagrams of a PDCCH transmitting apparatus provided in an embodiment of the present application;

Fig. 15 is a second schematic structural diagram of a PDCCH transmitting apparatus according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

fig. 17 is a schematic hardware structure of a terminal according to an embodiment of the present application;

fig. 18 is a schematic structural diagram of a network-side device according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the terms "first" and "second" are generally intended to be used in a generic sense and not to limit the number of objects, for example, the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It is noted that the techniques described in embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single carrier frequency division multiple access (Single-carrier Frequency Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the present application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New air interface (NR) system for purposes of example and uses NR terminology in much of the description that follows, but these techniques are also applicable to applications other than NR system applications, such as generation 6 (6) ^th Generation, 6G) communication system.

Fig. 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side Device called a notebook, a personal digital assistant (Personal Digital Assistant, PDA), a palm top, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet appliance (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (weather Device), a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), a smart home (home Device with a wireless communication function, such as a refrigerator, a television, a washing machine, or a furniture), a game machine, a personal Computer (personal Computer, PC), a teller machine, or a self-service machine, and the Wearable Device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing etc.. Note that, the specific type of the terminal 11 is not limited in the embodiment of the present application. The network-side device 12 may comprise an access network device or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network element. Access network device 12 may include a base station, a WLAN access point, a WiFi node, or the like, which may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a home node B, a home evolved node B, a transmission and reception point (Transmitting Receiving Point, TRP), or some other suitable terminology in the art, and the base station is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiments of the present application, only a base station in an NR system is described as an example, and the specific type of the base station is not limited.

Fig. 2 is a system block diagram of DFT-s-OFDM. Compared with OFDM, the transmitting end introduces M-point DFT operation before N-point IFFT, so that the PAPR of the output signal of the transmitting end is obviously reduced.

PDCCH based on OFDM:

one PDCCH consists of one or more control channel elements (Control Channel Element, CCEs), where the number of CCEs making up the PDCCH is referred to as the aggregation level (Aggregation Level, AL) of the PDCCH.

One CCE consists of 6 Resource element groups (Resource Element Group, REGs), one of which refers to one Resource Block (RB) on one OFDM symbol.

One CORESET (Control Resource Set) is defined by the frequency domainEach RB and in the time domainAnd the OFDM symbols.

Fig. 3, 4 and 5 are schematic diagrams of CORESET having values of n_coreset_symbol of 1, 2 and 3, respectively.

The PDCCH transmission method provided in the embodiments of the present application is described in detail below with reference to the accompanying drawings through some embodiments and application scenarios thereof.

Fig. 6 is a flowchart of an embodiment of a PDCCH transmission method according to an embodiment of the present invention. As shown in fig. 6, the method provided in this embodiment includes:

step 101, network side equipment determines a target position of a first complex symbol sequence in a second complex symbol sequence, and places the first complex symbol sequence at the target position in the second complex symbol sequence; the first complex symbol sequence is used for carrying data of the PDCCH;

Specifically, the network side device may place a first complex symbol sequence with a length of M1 to a target position of a second complex symbol sequence with a length of M2, where the first complex symbol sequence is used to carry transmission data of the PDCCH;

m1 and M2 are integers greater than 0, M1 being greater than or equal to M2.

Wherein the target position may be a continuous or discontinuous position in the second complex symbol sequence.

Step 101 may be implemented by a module that selects a location and places in fig. 7.

102, network side equipment performs DFT or conversion precoding processing on the second complex symbol sequence to obtain a third complex symbol sequence;

specifically, DFT or transform precoding (Transform Precoding) is performed on the second complex symbol sequence to obtain a third complex symbol sequence with a length of M2.

Optionally, the length of the second complex symbol sequence is related to at least one of:

the time domain length of the target time-frequency resource;

the frequency domain length of the target time-frequency resource;

the number of subcarriers contained in the physical resource block PRB;

and the time-frequency resource used for transmitting the reference signal in the target time-frequency resource.

Step 103, the network side equipment maps the third complex symbol sequence to the target time-frequency resource and sends the third complex symbol sequence.

Specifically, the third complex symbol sequence obtained by DFT or conversion precoding is mapped to a target time-frequency resource for transmission.

Optionally, the target time-frequency resource is a time-frequency resource configuring a search space or a control resource set CORESET.

For the case where the search space or CORESET occupies only one OFDM symbol, in fig. 7, the data at (1), i.e., the first complex symbol sequence with length M1, the data at (2), i.e., the second complex symbol sequence with length M2, and the data at (3), i.e., the third complex symbol sequence with length M2, are labeled.

For the case where the search space or CORESET occupies more than one OFDM symbol, the data marked (1), (2), and (3) in fig. 7 are accumulated by a plurality of OFDM symbols to have the following lengths: m1, M2, at this time, the sequence lengths of DFT and IDFT on each OFDM symbol are:

the CORESET occupies the number of Resource Blocks (RBs) on the OFDM symbol multiplied by the number of subcarriers contained in each RB;

or, the number of CORESET occupied RBs on the OFDM symbol is multiplied by the number of subcarriers contained in each RB, and the number of resource elements RE occupied by the reference signal is subtracted.

By the method, the network side equipment can transmit the PDCCH through the DFT-s-OFDM waveform to obtain lower peak-to-average power ratio (PAPR), and the terminal can accurately detect the PDCCH.

In the method of the embodiment, a network side device determines a target position of a first complex symbol sequence in a second complex symbol sequence, and places the first complex symbol sequence at the target position in the second complex symbol sequence; the first complex symbol sequence is used for carrying data of a PDCCH; performing DFT or conversion precoding processing on the second complex symbol sequence to obtain a third complex symbol sequence, namely a DFT-s-OFDM waveform; the network side equipment maps the third complex symbol sequence to the target time-frequency resource and sends the third complex symbol sequence, and in the scheme, the network side equipment can transmit the PDCCH through the DFT-s-OFDM waveform to obtain a lower peak-to-average power ratio (PAPR), and can improve the power amplification efficiency of the PA, so that the power of an output signal is ensured.

In an embodiment, the target position is a position corresponding to a position sequence of the target PDCCH in the K candidate PDCCHs; the K is an integer greater than 0;

specifically, the position corresponding to the position sequence of the target PDCCH in the K candidate PDCCHs is taken as the target position, where the first complex symbol sequence is located in the second complex symbol sequence, where K may be, for example, as shown in table 1:

TABLE 1

Optionally, in step 102, when the search space or CORESET occupies multiple OFDM, the network side device starts from the first OFDM symbol occupied by the search space or CORESET, and performs DFT or transmission precoding processing on the second complex symbol sequence one OFDM symbol by one OFDM symbol, to obtain a third complex symbol sequence.

In one embodiment, the "determining the target position of the first complex symbol sequence in the second complex symbol sequence" in step 101 may be implemented as follows:

the network side equipment divides the position index of the second complex symbol sequence into X3 first position index groups;

the network side equipment maps the position sequence of the target PDCCH to X2 first position index groups in the X3 first position index groups;

the network side equipment takes the positions corresponding to the X2 first position index groups as target positions;

wherein X2 and X3 are integers greater than 0, and X3 is greater than or equal to X2.

Specifically, the network side device groups the position indexes of the second complex symbol sequence to obtain X3 first position index groups, maps the position sequence of the target PDCCH to X2 first position index groups in the X3 first position index groups, and the sequence formed by the position index values contained in the X2 first position index groups is the position sequence of the target PDCCH, and the position corresponding to the X2 first position index groups is the target position.

Optionally, the network side device maps the location sequence of the target PDCCH to X2 first location index groups in the X3 first location index groups based on indexes of the target PDCCH in the K candidate PDCCHs.

For example, the index of the target PDCCH among the K candidate PDCCHs is 2,K to be 2, the index of the target PDCCH among the K candidate PDCCHs may be started from 0, assuming that X3 is 6, X2 is 2, and the numbers of X3 first position index groups are {0,1,2,3,4,5}, the position sequence of the target PDCCH may be mapped to the 4 th and 5 th first position index groups.

Optionally, mapping the location sequence of the target PDCCH to X2 of the X3 first location index groups is related to at least one of:

m1, X2, X3, number K of candidate PDCCHs related to M1 or X2, cell index and radio network temporary identifier RNTI;

wherein M1 is the length of the first complex symbol sequence.

Alternatively, the X2 first position index groups may be consecutive X2 position index groups among the X3 first position index groups.

Optionally, X2 is related to the aggregation level.

Optionally, the step of dividing the position indexes of the second complex symbol sequence into X3 first position index groups specifically includes:

the network side equipment divides the position index of the second complex symbol sequence into X1 second position index groups;

the network side equipment divides the X1 second position index groups into X3 first position index groups;

Wherein X1 is greater than or equal to X3.

Specifically, the position indexes (e.g., 0 to (M2-1)) of the second complex symbol sequence are divided into X1 second position index groups; this step corresponds to dividing REG in the time domain, and further dividing X1 second position index groups into X3 first position index groups, and this step corresponds to dividing CCE in the time domain.

In the above embodiment, dividing the position indexes of the second complex symbol sequence into X1 second position index groups corresponds to dividing REGs in the time domain; further, dividing the X1 second position index groups into X3 first position index groups corresponds to dividing CCEs in the time domain, and then mapping the position sequence of the target PDCCH onto X2 first position index groups in the X3 first position index groups, that is, onto some CCEs in the time domain, that is, onto the target positions, thereby realizing that the target positions in the second complex symbol sequence are placed into the first complex symbol sequence.

Fig. 8 shows two types of methods for dividing the position indexes of the second complex symbol sequence into X1 second position index groups. Alternatively, as shown in fig. 8, X1 second position index groups may be divided as follows:

the network side equipment continuously divides the position index of the second complex symbol sequence into X1' second position index groups in the range of each orthogonal frequency division multiplexing OFDM symbol occupied by the search space or CORESET; or alternatively, the first and second heat exchangers may be,

The network side equipment divides the position index of the second complex symbol sequence into X1' second position index groups in a uniformly dispersed mode in the range of each OFDM symbol occupied by the search space or CORESET;

the X1 second position index groups are obtained from corresponding X1' second position index groups in each OFDM symbol range in the plurality of OFDM symbols occupied by the search space or CORESET.

Specifically, the position indexes (e.g., 0 to (M2-1)) of the second complex symbol sequence are divided into X1 second position index groups, for example, in a continuous concentrated manner or in a uniformly dispersed manner.

In fig. 8, m2=72, x1=6, the search space or CORESET occupies 1 OFDM symbol, and X1' is equal to X1.

In the above embodiment, the second position index group is divided in a uniformly dispersed manner, so that the complex symbols of the PDCCH candidates are dispersed as much as possible in time during transmission, so as to obtain time diversity, and better transmission performance can be obtained when the wireless channel has fast fading.

Optionally, the size of each first position index group, the size of each second position index group, or the number X1, X2, and X3 is predefined for the protocol or configured for the network side device.

Optionally, the network side device may perform step 101 through an interleaver, where the location index of the second complex symbol sequence may be divided into X1 second location index groups through the interleaver, the X1 second location index groups are divided into X3 first location index groups, the location sequence of the target PDCCH is mapped to X2 first location index groups in the X3 first location index groups, and the location corresponding to the X2 first location index groups is taken as the target location.

Specifically, to achieve the uniformly dispersed division in fig. 8, an "interleaver" (interleaving) may be used for addressing at the transmitting end, and a "De-interleaver" (De-interleaving) may be used for addressing at the receiving end, as shown in fig. 9.

The interleaver of fig. 9 is one implementation of the select position and place module of fig. 7, and the deinterleaver of fig. 9 is one implementation of the select position and extract module of fig. 7.

In one embodiment, partitioning the first set of location indices may be accomplished by:

the network side equipment numbers the X1 second position index groups;

the network side equipment divides the X1 second position index groups into X3 first two position index groups based on the numbers of the second position index groups.

Specifically, first, the second position index group is numbered, as shown in fig. 10, with the number of the second position index group within OFDM ranging from 0 to 5.

Then, the second position index groups are divided into X3 first position index groups in a mode of continuous numbers and uniform numbers. The numbers of the first position index group are numbered in order of magnitude of the minimum value (or maximum value) of the numbers of the second position index group included in the first position index group. For example, the first position index group 0 includes the second position index groups 0 to (X1/X2-1).

Alternatively, the numbering of the second position index group may be as follows:

the network side equipment numbers the second position index group in a search space or a plurality of OFDM symbol ranges occupied by CORESET according to an OFDM symbol priority mode;

and the network side equipment numbers the second position index groups according to the minimum value or the maximum value of the position indexes contained in the second position index groups in the range of each OFDM symbol occupied by the search space or the CORESET.

Specifically, for the search space or the range of a plurality of OFDM symbols occupied by CORESET, firstly numbering the second position index group according to the mode of OFDM symbol priority; as shown in fig. 11, the second position index group is numbered in a manner of OFDM symbol priority within a search space or 2 OFDM symbols occupied by CORESET; as shown in fig. 12, the second position index group is numbered in a manner of OFDM symbol preference within a search space or 3 OFDM symbols occupied by CORESET. The numbers of the second position index groups are numbered in order of magnitude of the minimum value (or the highest index, i.e., the maximum value of the position index) of the lowest index (i.e., the minimum value of the position index) contained in the respective second position index groups within each OFDM symbol range occupied by the search space or CORESET.

As shown in fig. 11, the second position index groups are numbered in order of the minimum value or the maximum value of the position indexes included in each second position index group within each occupied OFDM symbol range, for example, assuming that 12 position indexes are included in the second position index group, the position indexes included in the second position index group 0 are 0 to 11, the position indexes included in the second position index group 2 are 24 to 35, the minimum values are 0 and 24, and the maximum values are 11 and 35, and thus the number of the second position index group 0 is smaller than that of the second position index group 2.

The OFDM symbols Z0, Z1, Z2 in fig. 10 to 12 may be continuous or discontinuous.

In the above embodiment, the second position index group is numbered according to the OFDM symbol priority mode in the search space or the multiple OFDM symbol range occupied by CORESET; and numbering the second position index groups according to the minimum value or the maximum value of the position indexes contained in the second position index groups in the range of each OFDM symbol occupied by the search space or the CORESET, so that the complexity is lower.

Optionally, the length of the second complex symbol sequence is any one of:

Wherein N is _f Represents the search space or the number of resource blocks RB occupied by CORESET,the number of subcarriers included in each RB is represented, L1 represents the number of OFDM symbols occupied by the search space or CORESET, and Nr represents the number of resource elements RE used for transmitting the reference signal in the time-frequency resource occupied by the search space or CORESET.

Specifically, the length of the second complex symbol sequence may be any one of the following:

the number of RBs occupied by the search space is multiplied by the number of subcarriers contained in each RB, and then multiplied by the number of OFDM symbols occupied by the search space; or alternatively, the first and second heat exchangers may be,

the number of RBs occupied by CORESET is multiplied by the number of subcarriers contained in each RB, and then multiplied by the number of OFDM symbols occupied by CORESET; or alternatively, the first and second heat exchangers may be,

multiplying the number of RBs occupied by the search space by the number of subcarriers contained in each RB, multiplying the number of OFDM symbols occupied by the search space, and subtracting the number of resource elements RE used for transmitting reference signals in time-frequency resources occupied by the search space; or alternatively, the first and second heat exchangers may be,

the number of RBs occupied by CORESET is multiplied by the number of subcarriers contained in each RB, then multiplied by the number of OFDM symbols occupied by CORESET, and then the number of resource elements RE used for transmitting reference signals in the time-frequency resource occupied by CORESET is subtracted;

optionally, the PDCCH transmission method further includes:

the network side equipment performs beam forming precoding by taking X4 RBs as precoding granularity on a target time-frequency resource; x4 is an integer greater than 0; wherein the same precoding vector is used within X4 RBs.

Specifically, when the network side device transmits the PDCCH on the target time-frequency resource, the network side device can take X4 RBs as precoding granularity to perform beamforming precoding on the DFT-s-OFDM waveform, and the same precoding vector is used in every X4 RBs, so that the terminal side can decode conveniently.

Alternatively, X4 and N _f Related to, or related to, search space or other parameters of CORESET, such as the number of consecutive PRBs in the frequency domain.

In the above embodiment, precoding granularity is designed for RB resources occupied by the search space, so as to obtain a balance between precoding flexibility and channel estimation accuracy.

Fig. 13 is a second flowchart of a PDCCH transmission method according to an embodiment of the present application. As shown in fig. 13, the method provided in this embodiment includes:

step 201, the terminal receives a fourth complex symbol sequence on the target time-frequency resource, and performs Inverse Discrete Fourier Transform (IDFT) or inverse conversion precoding operation on the fourth complex symbol sequence to obtain a fifth complex symbol sequence;

step 202, a terminal determines the position sequences of K candidate PDCCHs; k is an integer greater than 0;

step 203, the terminal extracts a sixth complex symbol sequence from the fifth complex symbol sequence based on the position sequences of the K candidate PDCCHs;

And 204, the terminal performs blind detection based on the sixth complex symbol sequence.

Specifically, the terminal receives the fourth complex symbol sequence on the target time-frequency resource, and the network side device may send the PDCCH on the target time-frequency resource received by the terminal, but may not send the PDCCH.

In the case that the network side device transmits the PDCCH on the target time-frequency resource, the fourth complex symbol sequence may be the third complex symbol sequence.

Steps 202 and 203 may be implemented by the module of fig. 7 that selects the location and extracts.

Optionally, the target time-frequency resource is a time-frequency resource for configuring a search space or controlling a resource set CORESET.

Optionally, the determining, by the terminal, a location sequence of K candidate PDCCHs includes:

the terminal divides the position index of the fifth complex symbol sequence into X3 first position index groups;

the terminal determines K groups of first position index groups in the X3 first position index groups based on the K candidate PDCCHs; each first position index group in the K first position index groups comprises X2 first position index groups;

the terminal determines the K groups of first position index groups as position sequences of the K candidate PDCCHs;

Optionally, the terminal divides the position indexes of the fifth complex symbol sequence into X3 first position index groups, including:

the terminal divides the position index of the fifth complex symbol sequence into X1 second position index groups;

the terminal divides the X1 second position index groups into the X3 first position index groups;

wherein X1 is greater than or equal to X3.

Optionally, the terminal divides the position indexes of the fifth complex symbol sequence into X1 second position index groups, including:

the terminal continuously divides the position index of the fifth complex symbol sequence into X1' second position index groups in the search space or each Orthogonal Frequency Division Multiplexing (OFDM) symbol range occupied by CORESET; or alternatively, the first and second heat exchangers may be,

the terminal divides the position index of the fifth complex symbol sequence into X1' second position index groups in a uniformly dispersed mode in the search space or each OFDM symbol range occupied by CORESET;

the X1 second position index groups are obtained from X1' second position index groups corresponding to each OFDM symbol range in a plurality of OFDM symbols occupied by the search space or CORESET.

the terminal determines the position sequences of K candidate PDCCHs through a de-interleaver;

the terminal extracts a sixth complex symbol sequence from the fifth complex symbol sequence based on the position sequences of the K candidate PDCCHs, including:

and the terminal extracts the sixth complex symbol sequence from the fifth complex symbol sequence based on the position sequences of the K candidate PDCCHs through a de-interleaver.

Optionally, the terminal divides the X1 second position index groups into the X3 first position index groups, including:

the terminal numbers the X1 second position index groups;

the terminal divides the X1 second position index groups into the X3 first position index groups based on the numbers of the second position index groups.

Optionally, the terminal numbers the X1 second position index groups, including:

the terminal numbers the second position index group in the range of the search space or a plurality of OFDM symbols occupied by CORESET according to the mode of OFDM symbol priority;

and the terminal numbers the second position index groups according to the minimum value or the maximum value of the position indexes contained in the second position index groups in the range of each OFDM symbol occupied by the search space or the CORESET.

Optionally, the terminal determines, based on the K candidate PDCCHs, a K group first position index group among the X3 first position index groups, related to at least one of:

m1, X2, X3, number K of candidate PDCCHs related to M1 or X2, cell index and radio network temporary identifier RNTI; wherein M1 is the length of the sixth complex symbol sequence.

Optionally, the performing inverse discrete fourier transform IDFT or inverse transform precoding operation on the fourth complex symbol sequence to obtain a fifth complex symbol sequence includes:

and under the condition that the search space or the CORESET occupies a plurality of OFDM, the terminal starts from the first OFDM symbol occupied by the search space or the CORESET, and performs IDFT or conversion precoding inverse operation on the fourth complex symbol sequence one OFDM symbol by one OFDM symbol to obtain the fifth complex symbol sequence.

Optionally, the length of the fifth complex symbol sequence is related to at least one of:

the time domain length of the target time-frequency resource;

the frequency domain length of the target time-frequency resource;

the number of subcarriers contained in the physical resource block PRB;

Optionally, the length of the fifth complex symbol sequence is any one of the following:

Optionally, the terminal may identify (or assume) that the assume precoding granularity is X5 RBs that are continuous in the frequency domain; x5 is an integer greater than 0.

Wherein the terminal can assume (assume) that the same precoding vector is used within X5 RBs.

Alternatively, X5 may be the same as or different from X4, e.g., X5 may be greater than X4.

Optionally, at least one of the following is configured by the network side device, or predefined by the protocol:

the size of the first position index group, the size of the second position index group, the X1, X2, X3, and K.

Optionally, the X5 is configured for a network side device, or predefined by a protocol.

The specific implementation process and technical effects of the method of the present embodiment are similar to those of the network side method embodiment, and specific reference may be made to the detailed description of the network side method embodiment, which is not repeated herein.

According to the PDCCH transmission method provided by the embodiment of the application, the execution body can be a PDCCH transmission device. In the embodiment of the present application, a PDCCH transmission apparatus executes a PDCCH transmission method as an example, and the PDCCH transmission apparatus provided in the embodiment of the present application is described.

Fig. 14 is a schematic structural diagram of a PDCCH transmitting apparatus provided in the present application. As shown in fig. 14, the PDCCH transmitting apparatus provided in this embodiment includes:

a processing module 210, configured to determine a target position of a first complex symbol sequence in a second complex symbol sequence, and place the first complex symbol sequence at the target position in the second complex symbol sequence; the first complex symbol sequence is used for carrying data of a PDCCH;

and the sending module 220 is configured to map the third complex symbol sequence onto a target time-frequency resource and send the third complex symbol sequence by using a network side device.

Optionally, the target position is a position corresponding to a position sequence of the target PDCCH in the K candidate PDCCHs; the K is an integer greater than 0;

the target time-frequency resource is a time-frequency resource for configuring a search space or controlling a resource set CORESET.

Optionally, the processing module 210 is specifically configured to:

dividing the position index of the second complex symbol sequence into X3 first position index groups;

mapping a position sequence of a target PDCCH to X2 first position index groups in the X3 first position index groups;

the network side equipment takes the positions corresponding to the X2 first position index groups as the target positions;

Optionally, the processing module 210 is specifically configured to:

dividing the position index of the second complex symbol sequence into X1 second position index groups;

dividing the X1 second position index groups into the X3 first position index groups;

wherein X1 is greater than or equal to X3.

Optionally, the processing module 210 is specifically configured to:

continuously dividing the position index of the second complex symbol sequence into X1' second position index groups in the search space or each Orthogonal Frequency Division Multiplexing (OFDM) symbol range occupied by CORESET; or alternatively, the first and second heat exchangers may be,

dividing the position index of the second complex symbol sequence into X1' second position index groups in a uniformly dispersed manner in the search space or each OFDM symbol range occupied by CORESET;

Optionally, the processing module 210 is specifically configured to:

determining a target position of a first complex symbol sequence in a second complex symbol sequence by an interleaver, and placing the first complex symbol sequence at the target position in the second complex symbol sequence.

Optionally, the processing module 210 is specifically configured to:

numbering the X1 second position index groups;

dividing the X1 second position index groups into the X3 first position index groups based on the numbers of the second position index groups.

Optionally, the processing module 210 is specifically configured to:

and mapping the position sequence of the target PDCCH to X2 first position index groups in the X3 first position index groups based on indexes of the target PDCCH in the K candidate PDCCHs.

Optionally, the processing module 210 is specifically configured to:

numbering the second position index group according to the mode of OFDM symbol priority in the range of a plurality of OFDM symbols occupied by the search space or CORESET;

And numbering the second position index groups according to the minimum value or the maximum value of the position indexes contained in the second position index groups in the range of each OFDM symbol occupied by the search space or the CORESET.

Optionally, mapping the location sequence of the target PDCCH to X2 first location index groups of the X3 first location index groups is related to at least one of:

m1, X2, X3, number K of candidate PDCCHs related to M1 or X2, cell index and radio network temporary identifier RNTI; wherein M1 is the length of the first complex symbol sequence.

the time domain length of the target time-frequency resource;

the frequency domain length of the target time-frequency resource;

the number of subcarriers contained in the physical resource block PRB;

Optionally, the length of the second complex symbol sequence is any one of the following:

Optionally, the processing module 210 is further configured to:

performing beam forming precoding by taking X4 RBs as precoding granularity on the target time-frequency resource; x4 is an integer greater than 0; wherein the same precoding vector is used in the X4 RBs.

Optionally, the processing module 210 is specifically configured to:

and under the condition that the search space or the CORESET occupies a plurality of OFDM, starting from a first OFDM symbol occupied by the search space or the CORESET, carrying out DFT or conversion precoding processing on the second complex symbol sequence one OFDM symbol by one OFDM symbol to obtain the third complex symbol sequence.

Optionally, the X4 is configured for a network side device, or predefined by a protocol.

The apparatus of the present embodiment may be used to execute the method of any one of the foregoing network side method embodiments, and specific implementation processes and technical effects of the apparatus are similar to those of the network side method embodiment, and specific details of the network side method embodiment may be referred to in the detailed description of the network side method embodiment and are not repeated herein.

Fig. 15 is a second schematic structural diagram of the PDCCH transmitting apparatus provided in the present application. As shown in fig. 15, the PDCCH transmitting apparatus provided in this embodiment includes:

a receiving module 310, configured to receive a fourth complex symbol sequence on the target time-frequency resource;

a processing module 320, configured to perform inverse discrete fourier transform IDFT or inverse transform precoding operation on the fourth complex symbol sequence to obtain a fifth complex symbol sequence;

the processing module 320 is further configured to determine a position sequence of K candidate PDCCHs; the K is an integer greater than 0;

blind detection is performed based on the sixth complex symbol sequence.

Optionally, the processing module 320 is specifically configured to:

dividing the position index of the fifth complex symbol sequence into X3 first position index groups;

determining a K group first position index group from the X3 first position index groups based on the K candidate PDCCHs; each first position index group in the K first position index groups comprises X2 first position index groups;

Determining the first position index group of the K groups as a position sequence of the K candidate PDCCHs;

Optionally, the processing module 320 is specifically configured to:

dividing the position index of the fifth complex symbol sequence into X1 second position index groups;

wherein X1 is greater than or equal to X3.

Optionally, the processing module 320 is specifically configured to:

continuously dividing the position index of the fifth complex symbol sequence into X1' second position index groups in the search space or each Orthogonal Frequency Division Multiplexing (OFDM) symbol range occupied by CORESET; or alternatively, the first and second heat exchangers may be,

dividing the position index of the fifth complex symbol sequence into X1' second position index groups in a uniformly dispersed manner in the search space or each OFDM symbol range occupied by CORESET;

Optionally, the processing module 320 is specifically configured to:

determining a position sequence of K candidate PDCCHs through a de-interleaver;

and extracting the sixth complex symbol sequence from the fifth complex symbol sequence based on the position sequences of the K candidate PDCCHs through a deinterleaver.

Optionally, the processing module 320 is specifically configured to:

numbering the X1 second position index groups;

Optionally, the processing module 320 is specifically configured to:

the time domain length of the target time-frequency resource;

the frequency domain length of the target time-frequency resource;

the number of subcarriers contained in the physical resource block PRB;

Optionally, the processing module 320 is further configured to: the precoding granularity can be considered as X5 PRBs which are continuous in the frequency domain; x5 is an integer greater than 0.

The apparatus of the present embodiment may be used to execute the method of any one of the foregoing terminal side method embodiments, and specific implementation processes and technical effects of the apparatus are similar to those of the terminal side method embodiment, and specific details of the terminal side method embodiment may be referred to in the detailed description of the terminal side method embodiment and are not repeated herein.

The PDCCH transmitting device in the embodiment of the present application may be an electronic device, for example, an electronic device with an operating system, or may be a component in an electronic device, for example, an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices than a terminal. By way of example, terminals may include, but are not limited to, the types of terminals 11 listed above, other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., and embodiments of the application are not specifically limited.

The PDCCH transmitting device provided in the embodiment of the present application can implement each process implemented by the embodiments of the methods of fig. 6 to 13, and achieve the same technical effects, and in order to avoid repetition, a detailed description is omitted here.

Optionally, as shown in fig. 16, the embodiment of the present application further provides a communication device 1600, including a processor 1601 and a memory 1602, where the memory 1602 stores a program or an instruction that can be executed on the processor 1601, for example, when the communication device 1600 is a terminal, the program or the instruction is executed by the processor 1601 to implement each step of the above-mentioned PDCCH transmission method embodiment, and the same technical effects can be achieved. When the communication device 1600 is a network side device, the program or the instruction, when executed by the processor 1601, implements the steps of the PDCCH transmission method embodiment described above, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the communication interface is used for receiving the PDCCH sent by the network side equipment; the PDCCH comprises a second complex symbol sequence mapped to the target time-frequency resource, wherein the second complex symbol sequence is obtained by performing DFT or conversion precoding processing on the first complex symbol sequence; the target position of the first complex symbol sequence comprises a third complex symbol sequence, and the length of the third complex symbol sequence is smaller than or equal to the length of the first complex symbol sequence; the third complex symbol sequence is used for carrying transmission data of the PDCCH; the processor is configured to acquire transmission data of the PDCCH at the target location. The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the terminal embodiment, and the same technical effects can be achieved. Specifically, fig. 17 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application.

The terminal 1000 includes, but is not limited to: at least some of the components of the radio frequency unit 1001, the network module 1002, the audio output unit 1003, the input unit 1004, the sensor 1005, the display unit 1006, the user input unit 1007, the interface unit 1008, the memory 1009, and the processor 1010, etc.

Those skilled in the art will appreciate that terminal 1000 can also include a power source (e.g., a battery) for powering the various components, which can be logically connected to processor 1010 by a power management system so as to perform functions such as managing charge, discharge, and power consumption by the power management system. The terminal structure shown in fig. 17 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine some components, or may be arranged in different components, which will not be described in detail herein.

It should be understood that in the embodiment of the present application, the input unit 1004 may include a graphics processing unit (Graphics Processing Unit, GPU) 10041 and a microphone 10042, and the graphics processor 10041 processes image data of still pictures or videos obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The display unit 1006 may include a display panel 10061, and the display panel 10061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 1007 includes at least one of a touch panel 10071 and other input devices 10072. The touch panel 10071 is also referred to as a touch screen. The touch panel 10071 can include two portions, a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In this embodiment, after receiving downlink data from the network side device, the radio frequency unit 1001 may transmit the downlink data to the processor 1010 for processing; in addition, the radio frequency unit 1001 may send uplink data to the network side device. In general, the radio frequency unit 1001 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 1009 may be used to store software programs or instructions and various data. The memory 1009 may mainly include a first storage area storing programs or instructions, which may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and a second storage area storing data. Further, the memory 1009 may include volatile memory or nonvolatile memory, or the memory 1009 may include both volatile and nonvolatile memory. Including high-speed random access Memory, and may also include non-volatile Memory, where the non-volatile Memory may be Read-Only Memory (ROM), programmable ROM (PROM), erasable Programmable ROM (EPROM), electrically Erasable Programmable EPROM (EEPROM), or flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). The memory 1009 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device.

The processor 1010 may include one or more processing units; alternatively, the processor 1010 may integrate an application processor that primarily processes operations involving an operating system, a user interface, and applications or instructions, and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 1010.

The radio frequency unit 1001 is configured to perform a fourth complex symbol sequence on the target time-frequency resource;

a processor 1010, configured to perform inverse discrete fourier transform IDFT or transform precoding inverse operation on the fourth complex symbol sequence to obtain a fifth complex symbol sequence;

the processor 1010 is further configured to determine a sequence of positions of K candidate PDCCHs; the K is an integer greater than 0;

blind detection is performed based on the sixth complex symbol sequence.

In the above embodiment, the terminal determines the position sequences of K candidate PDCCHs, extracts the sixth complex symbol sequence from the fifth complex symbol sequence, and performs blind detection based on the sixth complex symbol sequence to obtain the PDCCH of the network side device, where the network side device transmits the PDCCH by using a DFT-s-OFDM waveform, so that a lower peak-to-average ratio PAPR can be obtained, and the power amplification efficiency of the PA is improved, thereby ensuring the power of the output signal.

Optionally, the processor 1010 is specifically configured to:

wherein X1 is greater than or equal to X3.

In the above embodiment, dividing the position index of the fifth complex symbol sequence into X1 second position index groups corresponds to dividing REG in the time domain; further, dividing the X1 second position index groups into X3 first position index groups, which is equivalent to dividing CCEs in the time domain, and then determining K first position index groups in the X3 first position index groups based on the K candidate PDCCHs, thereby determining a position sequence of the K candidate PDCCHs, and extracting the sixth complex symbol sequence from the fifth complex symbol sequence based on the position sequence of the K candidate PDCCHs, with lower implementation complexity.

Optionally, the processor 1010 is specifically configured to:

determining a position sequence of K candidate PDCCHs through a de-interleaver;

Optionally, the processor 1010 is specifically configured to:

numbering the X1 second position index groups;

Optionally, the processor 1010 is specifically configured to:

Optionally, based on the K candidate PDCCHs, determining a K group first position index group among the X3 first position index groups, related to at least one of:

Optionally, the processor 1010 is specifically configured to: and under the condition that the search space or the CORESET occupies a plurality of OFDM, the terminal starts from the first OFDM symbol occupied by the search space or the CORESET, and performs IDFT or conversion precoding inverse operation on the fourth complex symbol sequence one OFDM symbol by one OFDM symbol to obtain the fifth complex symbol sequence.

the time domain length of the target time-frequency resource;

the frequency domain length of the target time-frequency resource;

the number of subcarriers contained in the physical resource block PRB;

Optionally, the processor 1010 is further configured to: the precoding granularity can be considered as X5 PRBs which are continuous in the frequency domain; x5 is an integer greater than 0.

The embodiment of the application also provides network side equipment, which comprises a processor and a communication interface, wherein the processor is used for carrying out DFT or conversion precoding processing on the first complex symbol sequence to obtain a second complex symbol sequence; the target position of the first complex symbol sequence comprises a third complex symbol sequence, and the length of the third complex symbol sequence is smaller than or equal to the length of the first complex symbol sequence; the third complex symbol sequence is used for carrying transmission data of the PDCCH, the second complex symbol sequence is mapped to the target time-frequency resource, and the communication interface is used for transmitting the second complex symbol sequence mapped to the target time-frequency resource. The network side device embodiment corresponds to the network side device method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.

Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 18, the network side device 700 includes: an antenna 71, a radio frequency device 72, a baseband device 73, a processor 75 and a memory 75. The antenna 71 is connected to a radio frequency device 72. In the uplink direction, the radio frequency device 72 receives information via the antenna 71, and transmits the received information to the baseband device 73 for processing. In the downlink direction, the baseband device 73 processes information to be transmitted, and transmits the processed information to the radio frequency device 72, and the radio frequency device 72 processes the received information and transmits the processed information through the antenna 71.

The above-described band processing means may be located in the baseband apparatus 73, and the method performed by the network-side device in the above embodiment may be implemented in the baseband apparatus 73, where the baseband apparatus 73 includes a baseband processor 75 and a memory 75.

The baseband device 73 may, for example, comprise at least one baseband board, on which a plurality of chips are disposed, as shown in fig. 18, where one chip, for example, a baseband processor 75, is connected to the memory 75 through a bus interface, so as to call a program in the memory 75 to perform the network device operation shown in the above method embodiment.

The network side equipment of the baseband apparatus 73 may further include a network interface 76 for interacting with the radio frequency apparatus 72, such as a common public radio interface (common public radio interface, abbreviated as CPRI).

Specifically, the network side device 700 of the embodiment of the present invention further includes: instructions or programs stored in the memory 75 and executable on the processor 75, the processor 75 invokes the instructions or programs in the memory 75 to perform the methods performed by the modules shown in fig. 14 and achieve the same technical effects, and are not repeated here.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the embodiment of the PDCCH transmission method, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

The embodiment of the application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is configured to run a program or an instruction, implement each process of the PDCCH transmission method embodiment, and achieve the same technical effect, so as to avoid repetition, and not be repeated here.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiments of the present application further provide a computer program/program product, where the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement each process of the embodiments of the PDCCH transmission method, and achieve the same technical effects, so that repetition is avoided, and details are not repeated herein.

The embodiment of the application also provides a communication system, which comprises: the terminal can be used for executing the steps of the PDCCH transmission method, and the network side device can be used for executing the steps of the PDCCH transmission method.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. A physical downlink control channel, PDCCH, transmission method comprising:

2. The PDCCH transmission method as set forth in claim 1, wherein,

the target position is a position corresponding to a position sequence of a target PDCCH in the K candidate PDCCHs; the K is an integer greater than 0;

3. The PDCCH transmission method of claim 2, wherein the network side device determining a location corresponding to a location sequence of the target PDCCH comprises:

4. The PDCCH transmission method of claim 3, wherein the network side device divides the position indexes of the second complex symbol sequence into X3 first position index groups, comprising:

the network side equipment divides the X1 second position index groups into the X3 first position index groups;

wherein X1 is greater than or equal to X3.

5. The PDCCH transmission method of claim 4 wherein the network side device divides the position indices of the second complex symbol sequence into X1 second position index groups comprising:

the network side equipment continuously divides the position index of the second complex symbol sequence into X1' second position index groups in the range of each Orthogonal Frequency Division Multiplexing (OFDM) symbol occupied by the search space or CORESET; or alternatively, the first and second heat exchangers may be,

The network side equipment divides the position indexes of the second complex symbol sequence into X1' second position index groups in a uniformly dispersed mode in each OFDM symbol range occupied by the search space or CORESET;

6. The PDCCH transmission method according to any one of claims 1-5, wherein the network side device determining a target position of a first complex symbol sequence in a second complex symbol sequence and placing the first complex symbol sequence at the target position in the second complex symbol sequence comprises:

the network side equipment determines a target position of a first complex symbol sequence in a second complex symbol sequence through an interleaver, and places the first complex symbol sequence at the target position in the second complex symbol sequence.

7. The PDCCH transmission method according to claim 4 or 5, wherein the network side device divides the X1 second position index groups into the X3 first position index groups, comprising:

The network side equipment numbers the X1 second position index groups;

the network side equipment divides the X1 second position index groups into the X3 first position index groups based on the numbers of the second position index groups.

8. The PDCCH transmission method according to any one of claims 3-5, wherein the network side device maps the position sequence of the target PDCCH to X2 first position index groups out of the X3 first position index groups, comprising:

the network side equipment maps the position sequence of the target PDCCH to X2 first position index groups in the X3 first position index groups based on indexes of the target PDCCH in the K candidate PDCCHs.

9. The PDCCH transmission method of claim 7, wherein the network side device numbering the X1 second location index groups comprises:

the network side equipment numbers the second position index group in a mode of OFDM symbol priority in a plurality of OFDM symbol ranges occupied by the search space or CORESET;

10. The PDCCH transmission method of any of claims 3-5, wherein mapping the sequence of locations of the target PDCCH to X2 of the X3 first location index groups is related to at least one of:

11. The PDCCH transmission method as set forth in any one of claims 1 to 5, wherein,

the length of the second complex symbol sequence is related to at least one of:

the time domain length of the target time-frequency resource;

the frequency domain length of the target time-frequency resource;

the number of subcarriers contained in the physical resource block PRB;

12. The PDCCH transmission method as claimed in claim 11, wherein,

the length of the second complex symbol sequence is any one of the following:

13. The PDCCH transmission method of any of claims 1-5, wherein the method further comprises:

the network side equipment performs beamforming precoding by taking X4 RBs as precoding granularity on the target time-frequency resource; x4 is an integer greater than 0; wherein the same precoding vector is used in the X4 RBs.

14. The PDCCH transmission method according to any one of claims 1-5, wherein the network side device performs DFT or transform precoding processing on the second complex symbol sequence to obtain a third complex symbol sequence, and the method comprises:

and under the condition that the search space or the CORESET occupies a plurality of OFDM, the network side equipment starts from a first OFDM symbol occupied by the search space or the CORESET, performs DFT or conversion precoding processing on the second complex symbol sequence one OFDM symbol by one OFDM symbol, and obtains the third complex symbol sequence.

15. The PDCCH transmission method of claim 4, wherein at least one of the following is configured by a network side device or predefined by a protocol:

16. The PDCCH transmission method as claimed in claim 13, wherein,

the X4 is configured for network side equipment or predefined by a protocol.

17. A physical downlink control channel, PDCCH, transmission method comprising:

18. The PDCCH transmission method as claimed in claim 17, wherein,

19. The PDCCH transmission method of claim 17 or 18, wherein the terminal determines a sequence of positions of K candidate PDCCHs, comprising:

20. The PDCCH transmission method of claim 19 wherein the terminal divides the position indices of the fifth complex symbol sequence into X3 first position index groups comprising:

wherein X1 is greater than or equal to X3.

21. The PDCCH transmission method of claim 20 wherein the terminal divides the position indices of the fifth complex symbol sequence into X1 second position index groups comprising:

22. The PDCCH transmission method of claim 20, wherein the terminal determining a sequence of positions for K candidate PDCCHs comprises:

23. The PDCCH transmission method of claim 20, wherein the terminal divides the X1 second position index groups into the X3 first position index groups, comprising:

The terminal numbers the X1 second position index groups;

24. The PDCCH transmission method of claim 23, wherein the terminal numbering the X1 second location index groups comprises:

the terminal numbers the second position index group in a search space or a plurality of OFDM symbol ranges occupied by CORESET according to an OFDM symbol priority mode;

25. The PDCCH transmission method as claimed in claim 19, wherein,

the terminal determines a K group first position index group from the X3 first position index groups based on the K candidate PDCCHs, the K group first position index group being related to at least one of:

26. The PDCCH transmission method of claim 17 or 18, wherein,

the length of the fifth complex symbol sequence is related to at least one of:

the time domain length of the target time-frequency resource;

the frequency domain length of the target time-frequency resource;

the number of subcarriers contained in the physical resource block PRB;

27. The PDCCH transmission method as claimed in claim 26, wherein,

the length of the fifth complex symbol sequence is any one of the following:

28. The PDCCH transmission method of claim 17 or 18, wherein the method further comprises:

the terminal can identify that the precoding granularity is X5 PRBs which are continuous in the frequency domain; x5 is an integer greater than 0.

29. The PDCCH transmission method of claim 17 or 18, wherein performing an inverse discrete fourier transform, IDFT, or a transform precoding inverse operation on the fourth complex symbol sequence to obtain a fifth complex symbol sequence comprises:

30. The PDCCH transmission method of claim 20, wherein at least one of the following is configured by a network side device or predefined by a protocol:

31. The PDCCH transmission method as claimed in claim 28, wherein,

the X5 is configured for network side equipment or predefined by a protocol.

32. A physical downlink control channel, PDCCH, transmission apparatus comprising:

And the transmitting module is used for mapping the third complex symbol sequence to the target time-frequency resource and transmitting the third complex symbol sequence.

33. A physical downlink control channel, PDCCH, transmission apparatus comprising:

extracting a sixth complex symbol sequence from the fifth complex symbol sequence based on the position sequences of the K candidate PDCCHs;

blind detection is performed based on the sixth complex symbol sequence.

34. A network side device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the PDCCH transmission method of any of claims 1 to 16.

35. A terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, performs the steps of the PDCCH transmission method of any of claims 17 to 31.

36. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implements the PDCCH transmission method of any one of claims 1-16 or the steps of the PDCCH transmission method of any one of claims 17 to 31.