WO2018137234A1

WO2018137234A1 - Downlink control information transmission method, network device and terminal device

Info

Publication number: WO2018137234A1
Application number: PCT/CN2017/072729
Authority: WO
Inventors: 任占阳; 韩金侠; 李振宇; 李志军
Original assignee: 华为技术有限公司
Priority date: 2017-01-26
Filing date: 2017-01-26
Publication date: 2018-08-02

Abstract

Provided are a DCI transmission method, a network device and a terminal device, which can match a terminal device with a higher capability and can improve the communication performance. The method comprises: a network device determining a first physical downlink control channel (PDCCH) candidate for bearing first DCI, wherein the first PDCCH candidate comprises at least two resource scheduling units; and the network device sending the first DCI to a terminal device by means of the first PDCCH candidate.

Description

Downlink control information transmission method, network device and terminal device

Technical field

The present application relates to the field of communications, and more specifically, to a downlink control information (Downlink Control Information, DCI) transmission method, a network device, and a terminal device.

Background technique

In a Long Term Evolution (LTE) system, a downlink control channel (PDCCH) is used to carry Downlink Control Information (DCI).

The DCI may indicate, for each terminal device, specific information of the terminal device, such as a time-frequency resource location where the downlink data of the terminal device is placed, a transmission mode of the downlink data used by the terminal device, etc., and may also indicate a plurality of terminal devices. Public information, such as system information and paging information.

With the development of communication systems, the capabilities of terminal devices are enhanced, and the performance requirements for network communication are also higher. How to perform DCI transmission to meet higher communication requirements is an urgent problem to be solved.

Summary of the invention

The embodiment of the present application provides a DCI transmission method, a network device, and a terminal device, which can match a terminal device with higher capability, and can improve communication performance.

In a first aspect, a method for transmitting a DCI is provided, including: determining, by a network device, a first physical downlink control channel PDCCH candidate for carrying a first DCI, where the first PDCCH candidate includes at least two resource scheduling units; The first PDCCH candidate, the network device sends the first DCI to a terminal device.

Therefore, in the embodiment of the present application, the DCI transmission is performed by the PDCCH candidate including the at least two resource scheduling units, the terminal device with higher capability can be matched, and the communication performance is improved, and the DCI transmission is performed by multiple resource scheduling units. Achieve flexible processing of resource allocation.

With reference to the first aspect, in a possible implementation manner of the first aspect, the network device, by using the first PDCCH candidate, to send the first DCI to a terminal device, including: the network device pair Coding with a DCI; the network device performs rate matching on the encoded first DCI; the network device sends the first DCI after rate matching by using the first PDCCH candidate, where The first DCI after the rate matching is mapped on the at least two resource scheduling units.

Therefore, the code rate can be reduced by carrying the rate-matched DCI by at least two resource scheduling units.

With reference to the first aspect or any one of the foregoing possible implementation manners, in another possible implementation manner of the foregoing aspect, the network device sends the first DCI to the terminal device by using the first PDCCH candidate The network device encodes the first DCI; the network device performs rate matching on the encoded first DCI; the network device sends the multiple rate matching a first DCI, wherein the first DCI after at least one rate matching is mapped on each of the at least two resource scheduling units, and the rate matching is performed in each of the multiple rate matching The first DCI is mapped to a resource scheduling unit, respectively.

Therefore, the terminal device can separately demodulate the received signals on each resource scheduling unit, so that the DCI can be acquired without demodulating all the resource scheduling units, and the terminal devices can be compatible with various capabilities. And further, the terminal device may determine that the received signals on any of the multiple resource scheduling units are combined and demodulated, so that the DCI can be correctly acquired in a scenario with poor signal quality.

In conjunction with the first aspect or any of the above possible implementations, another possible implementation of the first aspect In the formula, the first PDCCH candidate is capability information of the terminal device in the plurality of PDCCH candidates, and transmits a PDCCH candidate corresponding to at least one of a link quality of the first DCI and the first DCI.

The PDCCH candidate for transmitting the DCI is selected by the capability information of the terminal device, and the capability of the enhanced terminal device can be fully utilized.

And determining, according to the link quality, the PDCCH candidate for transmitting the DCI, the area with poor signal quality can be enhanced, so that the terminal device can correctly acquire the DCI, and the area with better signal quality is not enhanced to avoid resource waste.

And, based on the DCI, determining the PDCCH candidate for transmitting the DCI, the PDCCH candidate matching the DCI can be better selected.

With reference to the first aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the foregoing aspect, the multiple PDCCH candidate includes a first PDCCH candidate set and a second PDCCH candidate set, where The PDCCH candidate in the first PDCCH candidate set includes m resource scheduling units in n resource scheduling units, and the PDCCH candidates in the second PDCCH candidate set include the n resource scheduling units, where m is smaller than The n is greater than or equal to 2; wherein the capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set; The first PDCCH candidate is a PDCCH candidate in at least one PDCCH candidate corresponding to the first DCI in the second PDCCH candidate set.

Therefore, different kinds of PDCCH candidates can match different link quality and/or terminal capabilities, which can further improve communication performance.

With reference to the first aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the foregoing aspect, the at least one PDCCH candidate includes a first resource scheduling unit and a second resource scheduling unit, The first resource scheduling unit included in the at least one PDCCH candidate belongs to a first resource set, and the second resource scheduling unit included in the at least one PDCCH candidate belongs to a second resource set, and the second The set of resources is dedicated to the transmission of the first DCI, and the first set of resources is also used for transmission of other DCIs than the first DCI.

Therefore, the first DCI shares the resource set of the at least one resource scheduling unit with other DCIs, and the resource is wasted, and the resource set of the other resource scheduling units is dedicated, so that the first DCI can be enhanced.

In conjunction with the first aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the first aspect, the first resource set is further configured to combine resource scheduling units of the third resource set for use in The second DCI transmission, where the third resource set includes a second resource scheduling unit, the third resource set is dedicated to the transmission of the second DCI; the method further includes:

When the current subframe does not need to send the second DCI, the network device performs data transmission on the resources included in the third resource set.

Therefore, when the current subframe does not need to transmit the second DCI, the data is transmitted on the resources included in the resource set dedicated to the second DCI, and waste of resources can be avoided.

In conjunction with the first aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the first aspect, the first resource set includes a Control Channel Element (CCE), where The two resource sets include an enhanced control channel unit (eanced CCE, eCCE) or a physical resource block (PRB).

In conjunction with the first aspect or any of the above possible implementations, another possible implementation of the first aspect Wherein the first PDCCH candidate comprises at least two of the following resource scheduling units: CCE, eCCE and PRB.

With reference to the first aspect or any one of the foregoing possible implementation manners, in another possible implementation manner of the foregoing aspect, if the first DCI is common control information, the initial scrambling code of the at least two resource scheduling units The sequences are the same to ensure that the first DCI is correctly decoded.

Therefore, the PDCCH candidate can be enhanced on the basis of the original resource scheduling unit, and can be compatible with the existing terminal device.

With reference to the first aspect or any one of the foregoing possible implementation manners, in another possible implementation manner of the foregoing aspect, when the first PDCCH candidate includes a PRB, the first DCI is common control information.

In a second aspect, a method for transmitting a DCI is provided, including: determining, by a terminal device, a first physical downlink control channel PDCCH candidate, where the first PDCCH candidate includes at least two resource scheduling units; The PDCCH candidate is detected to obtain the first DCI sent by the network device.

With reference to the second aspect, in a possible implementation manner of the second aspect, the first DCI after the rate matching is mapped on the at least two resource scheduling units.

With reference to the second aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the second aspect, the first DCI after the rate matching is performed in the at least two resource scheduling units The first DCI after at least one rate matching is mapped on each of the at least two resource scheduling units, and the first DCI after each rate matching in the multiple rate matching Map to a resource scheduling unit separately.

With reference to the second aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the second aspect, the first PDCCH candidate is capability information of the multiple PDCCH candidates and the terminal device, Transmitting a link quality of the first DCI and a corresponding PDCCH candidate of the at least one of the first DCIs.

With reference to the second aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the second aspect, the multiple PDCCH candidate includes a first PDCCH candidate set and a second PDCCH candidate set, where The PDCCH candidate in the first PDCCH candidate set includes m resource scheduling units in n resource scheduling units, and the PDCCH candidates in the second PDCCH candidate set include the n resource scheduling units, where m is smaller than The n, the n is greater than or equal to 2, wherein the capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set; The first PDCCH candidate is a PDCCH candidate in the at least one PDCCH candidate corresponding to the first DCI in the second PDCCH candidate set.

With reference to the second aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the second aspect, the at least one PDCCH candidate includes a first resource scheduling unit and a second resource scheduling unit, The first resource scheduling unit included in the at least one PDCCH candidate belongs to a first resource set, and the second resource scheduling unit included in the at least one PDCCH candidate belongs to a second resource set, and the second The set of resources is dedicated to the transmission of the first DCI, and the first set of resources is also used for transmission of other DCIs than the first DCI.

With reference to the second aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the second aspect, the method further includes: not detecting the foregoing from the at least one PDCCH candidate When a DCI, The terminal device performs downlink data detection on the resources included in the first resource set.

With reference to the second aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the second aspect, the first resource set includes a CCE, and the second resource set includes an eCCE or a PRB.

With reference to the second aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the foregoing aspect, the first PDCCH candidate includes at least two of the following resource scheduling units: CCE, eCCE, and PRB.

With reference to the second aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the second aspect, when the first PDCCH candidate includes a PRB, the first DCI is common control information.

With reference to the second aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the second aspect, if the first DCI is common control information, the initial scrambling code of the at least two resource scheduling units The sequences are the same to ensure that the first DCI is correctly decoded. A third aspect provides a method for transmitting a DCI, where the network device determines a first physical downlink control channel PDCCH candidate for carrying a first DCI, where the first PDCCH candidate is a plurality of PDCCH candidates and a terminal. Capability information of the device, a link quality of the first DCI, and a PDCCH candidate corresponding to at least one of the first DCI; wherein the multiple PDCCH candidates include a first PDCCH candidate set and a second PDCCH candidate a set, where the first PDCCH candidate set shares a first resource set with the second PDCCH candidate set, and the second PDCCH candidate set is dedicated to a second resource set; the network device passes the first PDCCH candidate, Sending the first DCI to the terminal device.

Therefore, the first PDCCH candidate set and the second PDCCH candidate set share the first resource set, the resource is wasted, and the second PDCCH candidate set is dedicated to the second resource set, so that the DCI transmitted by the second PDCCH candidate can be obtained. Enhanced.

With reference to the third aspect, in a possible implementation manner of the third aspect, the capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate. And the first PDCCH candidate is a PDCCH candidate in the at least one PDCCH candidate corresponding to the first DCI in the second PDCCH candidate set.

With reference to the third aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the third aspect, the second resource set includes multiple resource sub-sets, and the second PDCCH candidate set corresponds to The PDCCH candidate corresponding to each DCI of the plurality of DCIs is dedicated to at least one resource subset.

Optionally, each of the plurality of PDCCH candidates corresponding to the first DCI is dedicated to a separate one of the resource subsets.

With reference to the third aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the third aspect, the method further includes: when the current subframe does not need to send the second DCI, The data is transmitted on the resources included in the dedicated resource subset corresponding to the second DCI.

A fourth aspect provides a method for transmitting a DCI, where the terminal device determines a first physical downlink control channel PDCCH candidate for carrying a first DCI, where the first PDCCH candidate is a plurality of PDCCH candidates and a PDCCH candidate. The capability information of the terminal device, the link quality of the first DCI, and the PDCCH candidate corresponding to at least one of the first DCI; wherein the multiple PDCCH includes a first PDCCH candidate set and a second PDCCH a candidate set, where the first PDCCH candidate set shares a first resource set with the second PDCCH candidate set, and the second PDCCH candidate set is dedicated to a second resource set; the terminal device passes the first PDCCH candidate Receiving the first DCI sent by the network device.

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate. Collection The first PDCCH candidate is a PDCCH candidate in the second PDCCH candidate set for at least one of the first DCIs.

With reference to the fourth aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the fourth aspect, the second resource set includes multiple resource sub-sets, and the second PDCCH candidate set corresponds to Multiple DCI species PDCCH candidates corresponding to each DCI are dedicated to at least one resource subset.

With reference to the fourth aspect, or any one of the foregoing possible implementation manners, in another possible implementation manner of the fourth aspect, the method further includes: when the current subframe does not need to send the second DCI, The data included in the dedicated resource subset included in the second DCI is used for data transmission.

In a fifth aspect, a network device is provided for performing the method of any of the first aspect or the first aspect of the first aspect. In particular, the device comprises functional modules for performing the method of any of the first aspect or the first aspect of the first aspect described above.

In a sixth aspect, a terminal device is provided for performing the method in any of the above-mentioned second aspect or any possible implementation of the second aspect. In particular, the apparatus comprises functional modules for performing the method of any of the possible implementations of the second aspect or the second aspect described above.

In a seventh aspect, a network device is provided for performing the method in any of the possible implementations of the third aspect or the third aspect above. In particular, the apparatus comprises functional modules for performing the method of any of the above-described third or third aspects of the third aspect.

In an eighth aspect, a terminal device is provided for performing the method in any of the above-mentioned fourth aspect or any possible implementation of the fourth aspect. In particular, the device comprises functional modules for performing the method of any of the above-described fourth or fourth aspects of the fourth aspect.

In a ninth aspect, a communication device is provided, comprising a processor and a memory. The memory stores instructions for executing the method of any of the above aspects or any of its possible implementations based on the instructions stored by the memory.

According to a tenth aspect, a computer readable medium is provided, comprising a computer readable medium storing instructions that perform the method of any of the above aspects or any of the possible implementations thereof.

DRAWINGS

FIG. 1 is a schematic diagram of a communication system in accordance with an embodiment of the present application.

FIG. 2 is a diagram of an application scenario according to an embodiment of the present application.

FIG. 3 is a schematic flowchart of a method for transmitting a DCI according to an embodiment of the present application.

FIG. 4 is a schematic diagram of a PDCCH candidate occupying a CCE according to an embodiment of the present application.

FIG. 5 is a schematic diagram of enhancing a PDCCH candidate according to an embodiment of the present application.

FIG. 6 is a schematic diagram of enhancing a PDCCH candidate according to an embodiment of the present application.

FIG. 7 is a schematic diagram of enhancing a PDCCH candidate according to an embodiment of the present application.

FIG. 8 is a schematic diagram of a resource occupation manner of a DCI according to an embodiment of the present application.

FIG. 9 is a schematic diagram of a resource occupation manner of a DCI according to an embodiment of the present application.

FIG. 10 is a schematic diagram of a resource occupation manner of a DCI according to an embodiment of the present application.

FIG. 11 is a schematic diagram of processing a DCI by a transmitting end according to an embodiment of the present application.

FIG. 12 is a schematic diagram of processing a DCI by a transmitting end according to an embodiment of the present application.

FIG. 13 is a schematic flowchart of a method for transmitting a DCI according to an embodiment of the present application.

FIG. 14 is a schematic block diagram of a network device according to an embodiment of the present application.

FIG. 15 is a schematic block diagram of a terminal device according to an embodiment of the present application.

16 is a schematic block diagram of a communication device in accordance with an embodiment of the present application.

detailed description

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

1 is a schematic diagram of a communication system using wireless communication of the present application. As shown in FIG. 1, the communication system 100 includes a network device 102, which may include multiple antennas, such as

antennas

104, 106, 108, 110, 112, and 114. In addition, the network device 102 may additionally include a transmitter chain and a receiver chain. It will be understood by those skilled in the art that the transmitter chain may be a transmitting system or a transmitter, and the receiver chain may be a receiving system or a receiver, and a transmitter chain. And the receiver chain can include multiple components (eg, processors, modulators, multiplexers, demodulators, demultiplexers, or antennas, etc.) associated with signal transmission and reception.

Network device 102 can communicate with a plurality of terminal devices, such as terminal device 116 and terminal device 122. However, it will be appreciated that network device 102 can communicate with any number of terminal devices similar to

terminal device

116 or 122.

Terminal devices

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

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

antennas

112 and 114, wherein

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, wherein 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.

For example, in a Frequency Division Duplex (FDD) system, for example, forward link 118 can use a different frequency band than reverse link 120, and forward link 124 can be used differently than reverse link 126. Frequency band.

As another example, in a Time Division Duplex (TDD) system and a Full Duplex system, the forward link 118 and the reverse link 120 can use a common frequency band, a forward link 124, and a reverse link. Link 126 can use a common frequency band.

Each antenna (or set of antennas consisting of multiple antennas) and/or regions designed for communication is referred to as a sector of network device 102. For example, the antenna group can be designed to communicate with terminal devices in sectors of the network device 102 coverage area. In the process in which network device 102 communicates with

terminal devices

116 and 122 via

forward links

118 and 124, respectively, the transmit antenna of network device 102 may utilize beamforming to improve the signal to noise ratio of

forward links

118 and 124. In addition, when the network device 102 uses beamforming to transmit signals to the randomly dispersed

terminal devices

116 and 122 in the relevant coverage area, the network device 102 uses a single antenna to transmit signals to all of its terminal devices. Mobile devices are subject to less interference.

At a given time, network device 102, terminal device 116, or terminal device 122 may be a wireless communication transmitting device and/or a wireless communication receiving device. When transmitting data, the wireless communication transmitting device can encode the data for transmission. In particular, the wireless communication transmitting device may acquire (eg, generate, receive from other communication devices, or store in memory, etc.) a certain number of data bits to be transmitted over the channel to the wireless communication receiving device. Such data bits may be included in a transport block (or multiple transport blocks) of data that may be segmented to produce multiple code blocks.

In addition, the communication system 100 may be a Public Land Mobile Network (PLMN) network or a D2D (Device to Device) network or an M2M (Machine to Machine) network or Other networks, FIG. 1 is only a simplified schematic diagram of an example, and other network devices may also be included in the network, which are not shown in FIG.

The network device in this embodiment of the present application may be a device that communicates with the terminal device, for example, a network device or a network device controller. Each network device can provide communication coverage for a particular geographic area and can communicate with terminal devices (e.g., UEs) located within the coverage area (cell). The network device may be a network device (for example, Base Transceiver Station, BTS) in a GSM system or a CDMA system, or may be a network device (for example, a NodeB, NB) in a WCDMA system, or may be an evolved type in an LTE system. a network device (for example, Evolutional Node B, eNBeNodeB), or a wireless controller in a Cloud Radio Access Network (CRAN), or the network device may be a network device in a future 5G network or a future evolved Network equipment in the Public Land Mobile Network (PLMN), etc.

The terminal device in the embodiment of the present application may refer to an access terminal, a user equipment (User Equipment, UE), a subscriber unit, a subscriber station, a mobile station, a remote station, a remote terminal, a mobile terminal, a user terminal, a terminal, a wireless communication device, User agent or user device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication. Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the Internet of Things, virtual reality devices, terminal devices in future 5G networks, or future evolved public land mobile networks Terminal equipment in the (Public Land Mobile Network, PLMN).

The method for transmitting DCI provided by the embodiment of the present application may be applied to a terminal device or a network device, where the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application running on the operating system layer. Floor. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also referred to as main memory). The operating system may be any one or more computer operating systems that implement business processing through a process, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, contacts, word processing software, and instant messaging software. Further, in the embodiment of the present application, the specific structure of the execution subject of the DCI transmission method is not particularly limited as long as the program of the code of the DCI transmission method of the embodiment of the present application can be run by The transmission method of the DCI of the application embodiment may be used for communication. For example, the execution body of the DCI transmission method in the embodiment of the present application may be a terminal device or a network device, or may be a terminal device or a network device capable of calling a program and executing the program. Functional module.

The embodiments of the present application can be applied to an unlicensed spectrum, and can also be applied to an authorized spectrum.

Optionally, if applied to an unlicensed spectrum, the unlicensed spectrum may be subjected to carrier aggregation with the licensed spectrum. Similarly, if applied to the licensed spectrum, the licensed spectrum may be carrier-aggregated with the unlicensed spectrum.

Currently, network devices can transmit DCI through the PDCCH channel. The DCI may indicate, for each user equipment, information specific to the user equipment, such as a time-frequency resource location where downlink data of the user equipment is placed, a transmission mode of downlink data usage of the user equipment, etc., and may also indicate that all user equipments are certain Public information, such as system information and paging information.

A set of time-frequency resource locations that the PDCCH may be placed is called a search interval, and each possible time-frequency resource location is called a PDCCH candidate in the search interval. The user equipment can perform blind detection on the PDCCH candidate to Get the required DCI.

The resource scheduling of the existing PDCCH candidate is a Control Channel Element (CCE), and the PDCCH candidate may be composed of 1, 2, 4 or 8 CCEs.

However, the use of CCEs to form PDCCH candidates for DCI transmission is not conducive to the improvement of communication performance.

For example, for a terminal device with higher capability, only the CCE is used to form a PDCCH candidate for DCI transmission, and the capability of the terminal device cannot be fully utilized.

For another example, for a scene having a certain area, for example, as shown in FIG. 2, such as a factory, a port, a warehouse, etc., there is occlusion and signal fading caused by walls, vehicle containers, large racks, etc., or A scenario in which the signal coverage needs to be expanded, such as an enterprise campus, uses only CCEs to form PDCCH candidates for DCI transmission, and the communication performance between the terminal device and the network device cannot meet the expected requirements.

Therefore, in order to match the higher-capability terminal device and improve the communication performance, the embodiment of the present application provides a DCI transmission method, which will be described in detail below with reference to FIG. 3 to FIG.

FIG. 3 is a schematic flowchart of a method 200 for transmitting a DCI according to an embodiment of the present application. As shown in FIG. 2, the method 200 includes the following.

In 210, the network device determines a first PDCCH candidate for carrying a first DCI, the first PDCCH candidate including at least two resource scheduling units.

It should be understood that the PDCCH candidate mentioned in the embodiment of the present application may be referred to as a PDCCH.

Specifically, from the perspective of the network device, the PDCCH candidate may be referred to as a PDCCH, and is still referred to as a PDCCH candidate from the perspective of the terminal device. Alternatively, the PDCCH candidate may be referred to as an ePDCCH candidate, and is not specifically limited in this embodiment.

Optionally, the resource scheduling unit in the embodiment of the present application may be a CCE, an eCCE, or a PRB.

Optionally, the CCE may include 9 resource element groups (REGs), and each REG may include four adjacent resource units on the same Orthogonal Frequency Division Multiplexing (OFDM) symbol. (Resource Element, RE) composition.

Alternatively, the eCCE may include 4 or 8 enhanced REGs (EREG), and each eREG may include up to 9 REs.

Optionally, the PRB includes up to 7 consecutive OFDM symbols on the slot and 12 consecutive subcarriers in the frequency domain.

Optionally, in the embodiment of the present application, the channel occupied by the CCE may be referred to as a PDCCH, and the PDCCH may occupy the first three symbols of each subframe in the time domain, and occupy the entire frequency band in the frequency domain.

Optionally, in the embodiment of the present application, the channel occupied by the eCCE may be referred to as an ePDCCH, and the ePDCCH may occupy a certain frequency band in the frequency domain, and the time domain may occupy a symbol other than the symbol occupied by the PDCCH in the subframe. Other symbols.

Optionally, in the embodiment of the present application, the channel occupied by the PRB may be referred to as a PDSCH, and the PDSCH may occupy a symbol other than the symbol occupied by the PDCCH in the time domain, and may occupy a full frequency band in the frequency domain. Or occupy a frequency band other than the frequency band occupied by the ePDCCH.

It should be understood that, in the embodiment of the present application, the CCE, the eCCE, the PRB, the PDCCH, the PDSCH, and the ePDCCH may also have other names, as long as the occupation manner of the time-frequency resource that meets the foregoing description is within the protection scope of the embodiment of the present application. . Alternatively, the CCE, the eCCE, the PRB, the PDCCH, the PDSCH, and the ePDCCH may also have other time-frequency occupation modes, which are not specifically limited in this embodiment of the present application.

Optionally, the DCI mentioned in the embodiment of the present application may be public control information or user-specific control information.

The resource carrying the common control information may be referred to as a common search space. When the network device needs to send the common control information, the network device may determine, from the PDCCH candidates included in the CSS, a PDCCH candidate for sending the common control information. .

A resource that carries user-specific control information may be referred to as a User Search Space (USS). When the network device needs to send the user-specific control information, the network device may determine a PDCCH candidate for transmitting the user-specific control information from the user search space.

Optionally, in the embodiment of the present application, the public search space and the user search space may have overlapping resources.

If the first DCI is common control information, the initial scrambling sequences of the at least two resource scheduling units are the same to ensure correct decoding of the first DCI. Optionally, in the embodiment of the present application, each DCI may correspond to at least one PDCCH candidate in the PDCCH candidate, that is, if there is no resource occupation, the PDCCH candidate may be arbitrarily determined from the at least one PDCCH candidate. Corresponds to the sending of DCI. The PDCCH candidate corresponding to the DCI may be referred to as a PDCCH candidate applicable to the DCI.

Optionally, in the embodiment of the present application, the same PDCCH candidate may be used for sending multiple DCIs.

For example, PDCCH candidates applicable to DCI #1 include PDCCH candidate #1, PDCCH candidate #2, and PDCCH candidate #3, and PDCCH candidates applicable to DCI #2 include PDCCH candidate #2, PDCCH candidate #3, and PDCCH candidate # 4; if it is determined that the PDCCH candidate #1 is used for the transmission of the DCI #1, the PDCCH candidate may be selected from the PDCCH candidate #2, the PDCCH candidate #3, and the PDCCH candidate #4 for the transmission of the DCI #2, if it is determined to adopt When PDCCH candidate #2 is used for transmission of DCI #1, it is possible to determine, from PDCCH candidate #3 and PDCCH candidate #4, that the PDCCH candidate is used for transmission of DCI #2.

Optionally, the PDCCH candidate for transmitting DCI may include multiple types, for example, a first PDCCH candidate and a second PDCCH candidate, where the first PDCCH candidate may include m resource scheduling in n resource scheduling units. The second PDCCH candidate may include n resource scheduling units, and m is smaller than n.

The first PDCCH candidate set may include a first PDCCH candidate, and the second PDCCH candidate set may include a second PDCCH candidate.

Certainly, the embodiment of the present application may also include at least two PDCCH candidate sets, and the PDCCH candidates of the at least two PDCCH candidate sets include the same types of resource scheduling units.

Optionally, if the first DCI is common control information, the initial scrambling sequence of the at least two resource scheduling units is the same to ensure that the first DCI is correctly decoded. Optionally, the first PDCCH candidate may include a first resource scheduling unit, and the second PDCCH candidate may include a first resource scheduling unit and a second resource scheduling unit.

For example, the first PDCCH candidate may include a CCE, and the second PDCCH candidate may include a CCE and an eCCE, or include a CCE and a PRB.

In order to facilitate a clearer understanding of the present application, the following description will be made by taking a first PDCCH candidate including a CCE as an example.

The aggregation level of the first PDCCH candidate may include four types, that is, 1, 2, 4, or 8, that is, the PDCCH candidate may be composed of 1, 2, 4, or 8 CCEs. The PDCCH candidate may be composed of CCEs with consecutive indexes. It should be understood that the term "index continuous" as used herein refers to the continuity of logical meanings, rather than the continuity on the physical REG.

Wherein, the CCEs for the PDCCH candidate m are given by:

Where L is the aggregation level, for the common search space Y _k =0, for the user-specific search space, Y _k =(A·Y _K-1 ) modD, where

A=39827, D=65537, Y _-1 =n _RNTI ≠0. Among them, the public search space has an aggregation level of 4 and 8, and the user search space has an aggregation level of 1, 2, 4, and 8.

The specific case of the first PDCCH candidate may be as shown in Table 1 below.

Table 1

For the sake of example and not limitation, FIG. 4 shows several PDCCH candidates. For example, PDCCH candidate #0 may occupy CCE#0, PDCCH candidate #1 may occupy CCE#2 and CCE#3, and PDCCH candidate #2 may occupy CCE# 4-7, PDCCH candidate #3 may occupy CCE#8-#15, PDCCH candidate #4 may occupy CCE#16-17, and PDCCH#5 candidate may occupy CCE#20-24.

Optionally, in the embodiment of the present application, the second PDCCH candidate may be understood as a candidate for enhancing the first PDCCH candidate.

Specifically, the PDCCH candidate corresponding to the partial aggregation level and/or part of the DCI may be enhanced while maintaining the original number of the first type of PDCCH candidates.

For example, the PDCCH candidates of the

aggregation levels

4 and 8 may be enhanced, or the PDCCH candidates corresponding to the common control information may be enhanced.

Optionally, in the embodiment of the present application, the enhancing the first PDCCH candidate may be performed by adding another type of resource scheduling unit based on the PDCCH candidate including the original number of resource scheduling units. At this time, the aggregation level may refer to the number of all resource scheduling units, and of course, may only refer to the number of certain resource scheduling units.

For example, 16 eCCEs are added to a PDCCH candidate having an aggregation level of 8 including 8 CCEs. In this case, the aggregation level of the enhanced PDCCH candidate may be referred to as 24, or may be referred to as 8.

Therefore, in the embodiment of the present application, the enhancement is performed on the basis of the original PDCCH candidate, so that the number of PDCCH candidates remains unchanged, so the number of blind detections of the terminal device is not enhanced, and two PDCCH candidates are available, which are compatible. Terminal equipment of different capabilities.

Optionally, the first PDCCH candidate may be enhanced, where the enhanced resources of each of the plurality of first PDCCH candidates may be respective dedicated resources.

Optionally, in the embodiment of the present application, the enhanced PDCCH candidate may be the same as the DCI corresponding to the PDCCH candidate before the enhancement, or may be different.

For example, the PDCCH candidate of the

aggregation level

1, 2 before the enhancement may be used to transmit the user-specific control information, and the enhanced PDCCH candidate based on the PDCCH candidate of the

aggregation level

1, 2 may be used to transmit the user-specific control information. It can also be used to send public control information.

Optionally, in the embodiment of the present application, the resources that are enhanced by the multiple first PDCCH candidates may be the same resource, or may be different resources.

Specifically, when a plurality of PDCCH candidates corresponding to the same DCI are enhanced, the same resource may be used.

For example, as shown in FIG. 5, assuming that the PDCCH candidate 2 and the PDCCH3 candidate are only used to transmit the DCI #1, the PDCCH candidate 2 and the PDCCH may be respectively adopted by eCCE #1, eCCE #2, eCCE #3, and eCCE #4. Candidate 3 is enhanced.

Alternatively, different resources may be used when enhancing different PDCCH candidates.

For example, as shown in FIG. 6, eCCE #1, eCCE #2, eCCE #3, and eCCE #4 may be enhanced for PDCCH candidate 2, and eCCE #5, eCCE #6, eCCE #7 may be used for PDCCH candidate 3. And eCCE#8 for enhancement.

Optionally, in the embodiment of the present application, the same PDCCH candidate may be enhanced multiple times, so that multiple enhanced PDCCH candidates may be obtained.

For example, as shown in FIG. 7, PDCCH candidate 3 can be enhanced with eCCE #1, eCCE #1, eCCE #2, eCCE #3, and eCCE #4, and eCCE #5, eCCE #6, eCCE #7 can be utilized. , and eCCE#8 for enhancement.

Optionally, in the embodiment of the present application, different PDCCH candidates may be enhanced by using the same resource, and if the different PDCCH candidates are used for multiple DCIs, and the same subframe needs to be sent, The DCI may select an enhanced PDCCH candidate for one DCI, and may select which DCI to use the enhanced PDCCH candidate for transmission, which may be determined according to actual conditions.

For example, it may be allocated to a DCI with a relatively high importance, such as a Common Cell Radio Network Temporary Identifier (CC-RNTI) scrambled Common (PDCCH) PDCCH.

Optionally, in the embodiment of the present application, the network device may also perform enhancement of the targeted PDCCH candidate.

For example, when only the Common PDCCH (CPDCCH) is enhanced, although the broadcast information configuration has a large number of enhanced eCCEs that can be used as PDCCH candidates, it is completely allocated only to candidates that carry the CPDCCH. For example, the broadcast configuration information configures two resource sets, and each resource set has eight PRB pairs, and all 64 eCCE resources are allocated only to the CPDCCH. The terminal device considers that the enhanced eCCE that can be used as a PDCCH candidate for the broadcast configuration also has the CPDCCH only when the CPDCCH demodulation is attempted. When other PDCCH CSS demodulation is attempted (for example, system information, paging message, msg2/msg4 scheduling), it is consistent with the detection mode of the first PDCCH candidate.

Alternatively, the PDCCH candidate that transmits the user-specific information may be enhanced by RRC, which does not conflict with the enhanced resource used as the PDCCH candidate for the broadcast configuration.

Optionally, in the embodiment of the present application, for the common search space, multiple first PDCCH candidates and multiple second PDCCH candidates may be included, and for the user search space, multiple first PDCCH candidates and may be included. A plurality of second PDCCH candidates.

Alternatively, the common search space may include a plurality of first PDCCH candidates and a plurality of second PDCCH candidates, and the user search space includes only a plurality of first PDCCH candidates or only a plurality of second PDCCH candidates.

Alternatively, the user only search space may include multiple first PDCCH candidates and multiple second PDCCH candidates, and the common search space includes only multiple first PDCCH candidates or only multiple second PDCCH candidates.

It should be understood that when the second PDCCH candidate includes three resource scheduling units, the first PDCCH candidate may be divided into a PDCCH candidate including one resource scheduling unit and a PDCCH candidate including two resource scheduling units, or may not be used. distinguish.

Optionally, in the embodiment of the present application, the PDCCH candidate for transmitting the DCI may be capability information of the terminal device, a link quality of the terminal device transmitting the DCI, and a DCI corresponding to at least one of the DCIs.

Specifically, the DCI may be transmitted according to the capability information of the terminal device and/or the PDCCH candidate corresponding to the PDCCH candidate corresponding to the link quality of the transmission DCI, and then the PDCCH candidate applicable to the DCI may be selected from the PDCCH candidates.

For example, if the quality of the downlink that currently transmits the DCI is poor, the second PDCCH candidate may be used. If the quality of the downlink that currently transmits the DCI is good, the first PDCCH candidate may be used.

For example, the capability of the terminal device is strong. For example, the decoding capability is strong. The second PDCCH candidate may be used. If the capability of the terminal device is weak, for example, the decoding capability is weak, the first type may be adopted. PDCCH candidate.

Of course, several factors such as the DCI to be transmitted, the link quality, and the capability information of the terminal device can be used in combination.

For example, in a case where the quality of the downlink that currently transmits the DCI is good, the first PDCCH candidate may be used even if the terminal device for which the DCI to be transmitted is an enhanced terminal device.

Alternatively, in addition to the capability information of the terminal device and/or the link quality of the transmitted DCI, which PDCCH candidate is used may be selected according to the DCI.

For example, the current DCI to be transmitted is the common control information, and the second PDCCH candidate may be used. The current DCI to be transmitted is the common control information, and the first PDCCH candidate may be used.

Optionally, in the embodiment of the present application, the network device may obtain the capability information of the terminal device, and/or the link quality of the current region, determine which PDCCH candidate is used to send the DCI to the terminal device, and send the DCI to the terminal device. And transmitting the indication information, indicating that the terminal device network device uses the PDCCH candidate to perform DCI transmission, and when performing DCI transmission, the PDCCH candidate may be used to perform DCI transmission.

The different types of PDCCH candidates may be used, and the DCI transmission is performed by using different modes.

Optionally, in the embodiment of the present application, a terminal device with strong capability may be referred to as an enhanced terminal device, and a terminal device with weak capability may be referred to as a common terminal device, and the capability of the terminal device may be hardware of the terminal device. Determined.

Optionally, in the embodiment of the present application, each DCI may correspond to at least one PDCCH candidate in the PDCCH candidate.

Optionally, the plurality of DCI hypotheses correspond to the at least one second PDCCH candidate, and the second PDCCH candidate corresponding to the multiple DCI formats may share the resource set for each resource scheduling unit in the at least one resource scheduling unit. The shared resource set refers to the corresponding resource scheduling unit, and the resource scheduling unit included in the PDCCH candidate corresponding to the multiple DCIs may belong to the same resource set, and the PDCCH candidate corresponding to the multiple DCIs The resource scheduling unit may overlap partially or completely in the resource set.

Specifically, the second PDCCH candidate corresponding to the multiple DCI formats may share a resource set for each of the at least two resource scheduling units.

For example, as shown in FIG. 8, DCI #1 and DCI #2 may have PDCCH resources at the locations as shown, and may share resources included in ePDCCH #1.

Alternatively, the second PDCCH candidate corresponding to the multiple DCI formats may share a resource set for some resource scheduling units in the at least two resource scheduling units, and may have a proprietary resource set for other resource scheduling units.

For example, as shown in FIG. 9, DCI #1 and DCI #2 may share the PDCCH resources of the location as shown in the figure, and may respectively occupy different ePDCCH resources. For example, DCI #1 may occupy the first few symbols of ePDCCH #1. Resources, while DCI#2 can occupy resources of the last few symbols of ePDCCH#2.

For example, as shown in FIG. 10, DCI #1 and DCI #2 may share the PDCCH resource of the position shown in the figure, and the resource in the DCI #1 dedicated ePDCCH #1, and the DCI #2 may be dedicated in the ePDCCH #2. Resources.

It should be understood that DCI #1 or DCI #2 mentioned above may include one or more DCIs, respectively.

It should also be understood that a plurality of DCIs sharing resources in a set may mean that resources occupied by the plurality of DCIs overlap completely or partially overlap.

Optionally, in the embodiment of the present application, for different DCIs, different types of resource scheduling units may be used to enhance the first PDCCH candidate.

For example, for common control information, a PDCCH candidate including a CCE and a PRB may be employed, and for user-specific control information, a PDCCH candidate including a CCE and an eCCE may be employed.

For example, DCI format 0 and DCI format 1 include DCIs that may employ PDCCH candidates including CCEs and eCCEs.

In 220, the network device sends the first DCI to the terminal device by using the first PDCCH candidate.

Optionally, in the embodiment of the present application, the first resource set (the resource set shared by the multiple DCIs) combines the resource scheduling of the third resource set in addition to the dedicated resource set (the second resource set) of the first DCI. The unit is configured to transmit the second DCI, where the third resource set includes a second resource scheduling unit, and if the network device determines that the current subframe does not need to send the second DCI, the resource included in the second resource set On, the data is transmitted.

For example, as shown in FIG. 10, in the current subframe, the network device needs to send DCI #1 without transmitting DCI #2, and then data transmission can be performed in ePDCCH #2, for example, in the ePDCCH #2 to the terminal. The device sends downlink data, or the scheduling terminal device sends uplink data to the network device in the ePDCCH #2.

Optionally, the sending, by the network device, the first DCI to the terminal device by using the first PDCCH candidate may have the following two implementation manners.

In an implementation manner, the first DCI is encoded; the encoded first DCI is matched with a rate; and the first DCI after the rate matching is sent by the first PDCCH candidate, where the at least The first DCI after the rate matching is mapped on the two resource scheduling units.

For example, as shown in FIG. 11, assuming that the DCI to be transmitted is DCI #1, the DCI #1 can be encoded to obtain coded bits, and the coded bits are rate matched once, and the bits matched at one rate are matched. Mapping to the PDCCH and the EPDCCH, that is, mapping to the CCE and the eCCE included in the determined candidate, wherein the network device may map the resources included in the eCCE after the resources included in the CCE are occupied.

Therefore, in this implementation, the first DCI is encoded, the encoded first DCI is matched with the first DCI, and the first DCI after the primary rate matching is mapped to at least two resource scheduling units for sending, because The resource scheduling unit that carries the first DCI is at least two, and the code rate can be reduced.

In another implementation manner, the first DCI is encoded; the encoded first DCI is subjected to multiple rate matching; and the first DCI after the multiple rate matching is sent, where the at least two resources are The first DCI after the rate matching is mapped to each resource scheduling unit in the scheduling unit, and the first DCI after the single rate matching in the multiple rate matching is mapped to a resource scheduling unit.

For example, as shown in FIG. 12, if the DCI to be transmitted is DCI#1, the DCI#1 can be encoded. The coded DCI #1 is obtained, and the coded DCI #1 is subjected to multiple rate matching, and the bit rate matched bit can be mapped to the CCE included in the PDCCH of the PDCCH candidate, and the bit matched by the other rate is matched. The eCCE included in the ePDCCH is mapped to the PDCCH candidate.

Optionally, the number of rate matching is related to the type and/or number of resource scheduling units included in the PDCCH candidate.

For example, for the first PDCCH candidate n, the aggregation level is 8, that is, including 8 CCEs. If the PDCCH candidate enhanced by the first PDCCH candidate n includes 4 eCCEs, rate matching may be performed for the 4 eCCEs after performing rate matching for 8 CCEs. Alternatively, if the PDCCH candidate enhanced in the first PDCCH candidate n includes 8 eCCEs, rate matching may be performed once for the 8 eCCEs after performing rate matching for 8 CCEs. Alternatively, if the PDCCH candidate enhanced by the first PDCCH candidate n includes 16 eCCEs, after performing rate matching for 8 CCEs, rate matching may be performed twice for the 16 eCCEs, where every 8 eCCEs The mapping has a DCI after rate matching.

Therefore, the terminal device can separately demodulate the received signals on each resource scheduling unit, so that the DCI can be acquired without demodulating all the resource scheduling units, and the terminal devices can be compatible with various capabilities.

Optionally, in the embodiment of the present application, the terminal device may determine that the received signals on any of the multiple resource scheduling units are combined and demodulated, so that the DCI may be correctly acquired in a scenario with poor signal quality.

It should be understood that the operation of transmitting the DCI may include other operations, including the encoding, the rate matching, for example, the Cyclic Redundancy Check (CRC), the interleaving, and the like. .

In 230, a PDCCH candidate is determined, and the terminal device determines that the first PDCCH candidate includes at least two resource scheduling units.

Optionally, in the embodiment of the present application, the first PDCCH candidate is capability information of the multiple PDCCH candidates and the terminal device, and the link quality of the first DCI is corresponding to at least one of the first DCI. PDCCH candidate.

Optionally, in the embodiment of the present application, the multiple PDCCHs include a first PDCCH candidate set and a second PDCCH candidate set, where the first PDCCH candidate set includes a part of the resource scheduling units of the at least two resource scheduling units, The second PDCCH set candidate includes the at least two resource scheduling units;

The capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set;

The first PDCCH candidate is a PDCCH candidate in the at least one PDCCH candidate corresponding to the first DCI in the second PDCCH candidate set.

Optionally, in the embodiment of the present application, the at least one PDCCH candidate corresponding to the first DCI includes a first resource scheduling unit and a second resource scheduling unit, where the at least one corresponding to the first DCI The first resource scheduling unit included in the PDCCH candidate belongs to the first resource set, and the second resource scheduling unit included in the at least one PDCCH candidate corresponding to the first DCI belongs to the second resource set, where the second resource set is dedicated. For the transmission of the first DCI, the first set of resources is also used for transmission of other DCIs other than the first DCI.

In 240, the terminal device detects the first PDCCH candidate to obtain the first DCI sent by the network device.

Optionally, in the embodiment of the present application, if there are multiple PDCCH candidates corresponding to the first DCI, The plurality of PDCCH candidates are sequentially blindly detected until the first DCI is obtained. The first DCI may be any one of a plurality of PDCCH candidates corresponding to the first DCI.

Optionally, the first DCI after the rate matching is mapped on the at least two resource scheduling units.

In the mapping mode, the terminal device may perform de-rate matching on the signals detected by the at least two resource scheduling units, and perform channel decoding on the de-rate matched signals to obtain the first DCI.

Optionally, the first DCI after the rate matching is performed in the at least two resource scheduling units, where at least one rate matching is mapped on each resource scheduling unit in the at least two resource scheduling units. The first DCI, the first DCI after the single rate matching in the multiple rate matching is mapped to a resource scheduling unit.

Optionally, in the embodiment of the present application, the terminal device may perform rate de-matching on the received signal multiple times, then soft combing, and then perform channel decoding.

Alternatively, the signals in the at least two resource schedules may be combined, the de-rate matching performed once, and then the channel decoding performed.

Alternatively, the terminal device may perform rate de-matching on the rate-matched signal and perform decoding. If the DCI is available, the decoding operation is stopped. If the DCI is not obtained, the signals of other sub-rate matching may be solved. Rate matching and decoding.

Alternatively, in a case where the channel state is good, the enhanced terminal device can be used without decoding, and the signal on the eCCE resource is not decoded, and the PDCCH can be solved by using the CCE resource separately as the ordinary terminal device.

It should be understood that, in the embodiment of the present application, the operation of detecting the DCI may include other operations, such as de-interleaving, etc., in addition to the foregoing operations, and details are not described herein.

Optionally, in the embodiment of the present application, when the first DCI is not detected from a PDCCH candidate corresponding to the first DCI, the terminal device is on a resource included in the first resource set, Perform downlink data detection.

Optionally, in the embodiment of the present application, the network device may be configured for each resource scheduling unit.

For example, the network device may send first configuration information, where the first configuration information is used to indicate the number of symbols that the CCE can occupy.

For example, the network device may send the second configuration information, where the second configuration information is used to indicate a PRB pair that the eCCE can occupy, and the PRB pair that performs enhanced PDCCH candidates by using the PRB.

Optionally, in the embodiment of the present application, for a resource scheduling unit, the network device may configure multiple resource sets, and the resource scheduling unit in the resource set may be scheduled with resources in at least one resource set of other resource scheduling units. The units are separately combined to obtain a PDCCH candidate for DCI transmission.

Optionally, in the embodiment of the present application, the resource set configurable for each resource scheduling unit may be three or more.

Optionally, when the resource scheduling unit included in the PDCCH candidate is a PRB or an eCCE, the resource set configured for the PRB or the eCCE may be in a PRB unit, where each resource set may include more than 8 PRBs, for example, 16 or more.

Optionally, when the resource scheduling unit of the PDCCH candidate corresponding to the scheduling information of the system information block (SIB) is configured, the configuration information is carried in a master information block (MIB).

Optionally, when configuring the resource scheduling unit for the PDCCH candidate corresponding to the common control information except the SIB, the configuration information is carried in the SIB.

Optionally, when the resource scheduling unit included in the PDCCH candidate corresponding to the user-specific control information is configured, the configuration information is carried in Radio Resource Control (RRC) signaling.

Optionally, in the embodiment of the present application, in the case that the PDCCH candidate is enhanced for the existing PDCCH candidate, the network device only configures the resource for enhancing the PDCCH candidate, and the resource originally included in the PDCCH candidate may be preset in the terminal device. The above, for example, can be factory preset.

For example, in the MulteFire (MF) system, resources reserved for enhancing PDCCH candidates may be configured using the spare field reserved in the MIB-MF.

Optionally, the PDCCH extension resource is configured by using the spare field of the MIB, and can be used for all PDCCH candidates, that is, system information RNTI (SI-RNTI), paging RNTI (Paging P-RNTI), and random access RNTI. (Random Access RNTI, RA-RNTI), Temporary TC-RNTI (temporary C-RNTI, TC-RNTI), etc.

Optionally, the resources occupied by the PDCCH candidate may be pre-configured on the terminal device and the network device, and the network device does not need to be pre-configured by means of signaling interaction, for example, may be preset by the factory.

Optionally, in the embodiment of the present application, the network device may also send configuration information, where it is used to indicate that the DCI is sent by using a centralized or distributed resource, where the indication may be adopted for each resource set or resource sub-collection. Centralized or distributed resources for DCI transmission.

Therefore, in the embodiment of the present application, the DCI transmission is performed by the PDCCH candidate including the at least two resource scheduling units, the terminal with higher capability can be matched, and the communication performance is improved, and the DCI transmission by the multiple resource scheduling units can be implemented. Flexible handling of resource allocation.

FIG. 13 is a schematic flowchart of a method 300 for transmitting DCI according to an embodiment of the present application. As shown in FIG. 13, the method 300 includes the following.

Determining, in 310, a first PDCCH candidate for carrying a first DCI, where the first PDCCH candidate is capability information of a plurality of PDCCH candidates with a terminal device, a link quality for transmitting the first DCI, and the first At least one corresponding PDCCH candidate in the DCI, where the multiple PDCCHs include a first PDCCH candidate set and a second PDCCH candidate set, where the first PDCCH candidate set and the second PDCCH candidate set share a first resource set The second PDCCH candidate set is dedicated to the second resource set.

Optionally, the capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set; wherein the first PDCCH candidate is the first Among the two PDCCH candidate sets, PDCCH candidates in at least one PDCCH candidate corresponding to the first DCI.

Optionally, the second resource set includes multiple resource sub-sets, and the multiple PDCCH candidate corresponding to the second PDCCH candidate set is dedicated to at least one resource subset of each PDCCH candidate corresponding to each DCI.

In 320, the first DCI is sent to the terminal device by using the first PDCCH candidate.

Optionally, when the current subframe does not need to send the second DCI, data is transmitted on a resource included in a dedicated resource subset included in the second DCI.

In 330, a PDCCH candidate for carrying a first DCI is determined, where the first PDCCH candidate is capability information of the multiple PDCCH candidates and the terminal device, and a link quality and a location of the first DCI is transmitted. At least one corresponding PDCCH candidate in the first DCI, where the multiple PDCCH candidates include a first PDCCH candidate set and a second PDCCH candidate set, where the first PDCCH candidate set and the first The second PDCCH candidate set shares a first resource set, and the second PDCCH candidate set is dedicated to a second resource set;

In 340, the first PDCCH candidate is detected to obtain the first DCI sent by the network device.

Optionally, the terminal device performs downlink data detection when the first DCCI is not detected by the first PDCCH candidate.

It should be understood that the specific implementation of the method 300 shown in FIG. 3 may be referred to the specific description in the method 200 shown in FIG. 2, and details are not described herein for brevity.

The transmission method of the DCI according to the embodiment of the present application has been described above with reference to FIG. 3 to FIG. 13, and an apparatus for the above method according to an embodiment of the present application will be described below with reference to FIGS.

FIG. 14 is a schematic flowchart of a network device 400 according to an embodiment of the present application. As shown in FIG. 14, the network device 400 may include a determining unit 410 and a transmitting unit 420.

Optionally, the network device 400 can be used to perform operations performed by the network device in the method 200 shown in FIG. 2.

Specifically, the determining unit 410 is configured to determine a first physical downlink control channel PDCCH candidate for carrying the first DCI, where the first PDCCH candidate includes at least two resource scheduling units;

The sending unit 420 is configured to send the first DCI to the terminal device by using the first PDCCH candidate.

Optionally, the sending unit 420 is specifically configured to: encode the first DCI; perform rate matching on the encoded first DCI; and send a rate matching by using the first PDCCH candidate. And the first DCI, where the first DCI after the rate matching is mapped on the at least two resource scheduling units.

Optionally, the sending unit 420 is specifically configured to: encode the first DCI; perform rate matching on the encoded first DCI; and send the first after the multiple rate matching a DCI, wherein the first DCI after at least one rate matching is mapped on each of the at least two resource scheduling units, and the first rate after the single rate matching in the multiple rate matching The DCI is mapped to a resource scheduling unit.

Optionally, the first PDCCH candidate is capability information of the terminal device in the multiple PDCCH candidates, and transmits a PDCCH candidate corresponding to at least one of a link quality of the first DCI and the first DCI. .

Optionally, the multiple PDCCH candidates include a first PDCCH candidate set and a second PDCCH candidate set, where the PDCCH candidate in the first PDCCH candidate set includes m resource scheduling units in n resource scheduling units, The PDCCH candidate in the second PDCCH candidate set includes the n resource scheduling units, where m is smaller than the n, and the n is greater than or equal to 2; wherein the capability information and/or the transmission device of the terminal device The PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set; wherein the first PDCCH candidate is at least one PDCCH corresponding to the first DCI in the second PDCCH candidate set. PDCCH candidate in the candidate.

Optionally, the PDCCH candidate in the at least one PDCCH candidate includes a first resource scheduling unit and a second resource scheduling unit, where the PDCCH candidate in the at least one PDCCH candidate includes the first resource scheduling The unit belongs to the first resource set, and the second resource scheduling unit included in the PDCCH candidate in the at least one PDCCH candidate belongs to the second resource set, and the second resource set is dedicated to the transmission of the first DCI. The first set of resources is also used for transmission of DCIs other than the first DCI.

Optionally, the first resource set is further configured to combine a resource scheduling unit of the third resource set for transmission of the second DCI, where the third resource set includes a second resource scheduling unit, where the third The resource set is dedicated to the transmission of the second DCI; the sending unit is further configured to:

When the current subframe does not need to send the second DCI, the data is transmitted on the resources included in the third resource set.

Optionally, the first resource set includes a CCE, and the second resource set includes an eCCE or a PRB.

Optionally, the first PDCCH candidate includes at least two of the following resource scheduling units:

CCE, eCCE and PRB.

Optionally, when the first PDCCH candidate includes a PRB, the first DCI is common control information.

Optionally, if the first DCI is common control information, the initial scrambling sequence of the at least two resource scheduling units is the same.

Optionally, the network device 400 can be used to perform the method performed by the network device in the method 300 shown in FIG.

Specifically, the determining unit 410 is configured to: determine a first PDCCH candidate for carrying the first DCI, where the first PDCCH candidate is capability information of the terminal device and the link that transmits the first DCI. a PDCCH candidate corresponding to at least one of the first DCIs, where the multiple PDCCHs include a first PDCCH candidate set and a second PDCCH candidate set, where the first PDCCH candidate set and the second PDCCH candidate set The first resource set is shared, and the second PDCCH candidate set is dedicated to the second resource set. The sending unit 420 is configured to: send, by using the first PDCCH candidate, the first DCI to the terminal device.

Optionally, the second resource set includes multiple resource sub-sets, and the PDCCH candidate corresponding to each DCI of the multiple DCIs corresponding to the second PDCCH candidate set is dedicated to at least one resource subset.

FIG. 15 is a schematic block diagram of a terminal device 500 according to an embodiment of the present application. As shown in FIG. 15, the network device 500 includes a determining unit 510 and a detecting unit 520.

Alternatively, the terminal device may perform the operations performed by the terminal device in the method shown in FIG. 2.

Specifically, the determining unit 510 is configured to determine a first physical downlink control channel PDCCH candidate, where the first PDCCH candidate includes at least two resource scheduling units;

The detecting unit 520 is configured to detect the first PDCCH candidate to obtain the first DCI sent by the network device.

Optionally, the multiple PDCCH candidates include a first PDCCH candidate set and a second PDCCH candidate set, where the PDCCH candidate in the first PDCCH candidate set includes m resource scheduling units in n resource scheduling units, The PDCCH candidate in the second PDCCH candidate set includes the n resource scheduling units, the m is smaller than the n, and the n is greater than or equal to 2; wherein the capability information of the terminal device and/or the transmission is The PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set; wherein the first PDCCH candidate is at least one PDCCH candidate corresponding to the first DCI in the second PDCCH candidate set PDCCH candidate in .

Optionally, the at least one PDCCH candidate includes a first resource scheduling unit and a second resource scheduling unit, where the first resource scheduling unit included in the at least one PDCCH candidate belongs to a first resource set, where The second resource scheduling unit included in the at least one PDCCH candidate belongs to a second resource set, and the second resource set is dedicated to transmission of the first DCI, where the first resource set is further used to Transmission of other DCIs other than a DCI.

Optionally, the detecting unit 520 is further configured to:

When the first DCI is not detected from the at least one PDCCH candidate, downlink data is detected on a resource included in the first resource set.

CCE, eCCE and PRB.

Alternatively, the terminal device may perform the operations performed by the terminal device in the method shown in FIG.

Specifically, the determining unit 510 is configured to: determine a PDCCH candidate for carrying the first DCI, where the first PDCCH candidate is capability information of the multiple PDCCH candidates and the terminal device, and the first DCI is transmitted. And a PDCCH candidate corresponding to at least one of the first DCI; wherein the multiple PDCCH candidates include a first PDCCH candidate set and a second PDCCH candidate set, where the first PDCCH candidate set and The second PDCCH candidate set shares the first resource set, and the second PDCCH candidate set is dedicated to the second resource set. The sending unit 520 is configured to: detect the first PDCCH candidate, to obtain the First DCI.

FIG. 16 is a schematic block diagram of a communication device 600 in accordance with an embodiment of the present application. As shown in FIG. 16, the device 600 includes a processor 610 and a memory 620. The memory 620 can store instructions, and the processor 610 can call the instructions stored in the memory 620.

Alternatively, as shown in FIG. 6, the device 600 can include a transceiver 630 that can control the transceiver 630 to communicate externally.

Alternatively, the processor 610, the memory 620, and the transceiver 630 can be connected through an internal connection path.

Optionally, the processor 610 can invoke the instructions stored in the memory 620 to perform the method 200 shown in FIG. The corresponding operations of the network devices in the following are not repeated here for brevity.

Optionally, the processor 610 can invoke the instructions stored in the memory 620 to perform the corresponding operations of the terminal device in the method 200 shown in FIG. 2, and details are not described herein for brevity.

Optionally, the processor 610 can call the program code stored in the memory 620 to perform the corresponding operations of the network device in the method 300 shown in FIG. 3. For brevity, details are not described herein again.

Optionally, the processor 610 can call the program code stored in the memory 620 to perform the corresponding operations of the terminal device in the method 300 shown in FIG. 3. For brevity, no further details are provided herein.

It can be understood that the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability. The processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be a read-only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (Erasable PROM, EPROM), or an electric Erase programmable read only memory (EEPROM) or flash memory. The volatile memory can be a Random Access Memory (RAM) that acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM). SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Synchronous Connection Dynamic Random Access Memory (Synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (DR RAM). It should be noted that the memories of the systems and methods described herein are intended to comprise, without being limited to, these and any other suitable types of memory.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The unit described as a separate component may or may not be physically separated as a unit display The components may or may not be physical units, ie may be located in one place, or may be distributed over multiple network elements. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present application, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A method for transmitting downlink control information DCI, comprising:

The network device determines a first physical downlink control channel PDCCH candidate for carrying the first DCI, where the first PDCCH candidate includes at least two resource scheduling units;

The network device sends the first DCI to the terminal device by using the first PDCCH candidate.
The method according to claim 1, wherein the sending, by the network device, the first DCI to the terminal device by using the first PDCCH candidate comprises:

The network device encodes the first DCI;

The network device performs rate matching on the encoded first DCI;

And the first DCI after the rate matching is performed by the network device by using the first PDCCH candidate, where the first DCI after the rate matching is mapped on the at least two resource scheduling units.
The method according to claim 1, wherein the sending, by the network device, the first DCI to the terminal device by using the first PDCCH candidate comprises:

The network device encodes the first DCI;

The network device performs multiple rate matching on the encoded first DCI;

Transmitting, by the network device, the first DCI after the multiple rate matching, where the first DCI after at least one rate matching is mapped on each of the at least two resource scheduling units, The first DCI after each rate matching in the multiple rate matching is respectively mapped to one of the at least two resource scheduling units.
The method according to any one of claims 1 to 3, wherein the first PDCCH candidate is capability information of the plurality of PDCCH candidates and the terminal device, and the link quality of the first DCI is transmitted. a PDCCH candidate corresponding to at least one of the first DCIs.
The method according to claim 4, wherein the plurality of PDCCH candidates comprise a first PDCCH candidate set and a second PDCCH candidate set, wherein the PDCCH candidate in the first PDCCH candidate set includes n resource scheduling a m resource scheduling unit in the unit, the PDCCH candidate in the second PDCCH candidate set includes the n resource scheduling units, the m is smaller than the n, and the n is greater than or equal to 2;

The capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set;

The first PDCCH candidate is a PDCCH candidate in at least one PDCCH candidate corresponding to the first DCI in the second PDCCH candidate set.
The method according to claim 5, wherein the at least one PDCCH candidate comprises a first resource scheduling unit and a second resource scheduling unit, wherein the at least one PDCCH candidate comprises the first resource The scheduling unit belongs to the first resource set, the second resource scheduling unit included in the at least one PDCCH candidate belongs to the second resource set, and the second resource set is dedicated to the transmission of the first DCI, where the first The set of resources is also used for transmission of other DCIs than the first DCI.
The method according to claim 6, wherein the first resource set is further configured to combine resource scheduling units of the third resource set for transmission of the second DCI, wherein the third resource set includes The two resource scheduling units are dedicated to the transmission of the second DCI; the method further includes:

When the current subframe does not need to send the second DCI, the network device is included in the third resource set On the resource, the data is transmitted.
The method according to claim 6 or 7, wherein the first resource set comprises a control channel element CCE, and the second resource set comprises an enhanced control channel element eCCE or a physical resource block PRB.
The method according to any one of claims 1 to 7, wherein the first PDCCH candidate comprises at least two of the following resource scheduling units:

Control resource unit CCE, enhanced control resource unit eCCE and physical resource block PRB.
The method according to claim 9, wherein when the first PDCCH candidate includes a PRB, the first DCI is common control information.
The method according to any one of claims 1 to 10, wherein if the first DCI is common control information, the initial scrambling sequences of the at least two resource scheduling units are the same.
A method for transmitting downlink control information DCI, comprising:

The terminal device determines a first physical downlink control channel PDCCH candidate, where the first PDCCH candidate includes at least two resource scheduling units;

The terminal device detects the first PDCCH candidate to obtain a first DCI sent by the network device.
The method according to claim 12, wherein the first DCI after rate matching is mapped on the at least two resource scheduling units.
The method according to claim 12, wherein the first DCI after multiple rate matching is mapped in the at least two resource scheduling units, wherein each resource in the at least two resource scheduling units Mapping, by the scheduling unit, the first DCI after at least one rate matching, where the first DCI after each rate matching in the multiple rate matching is respectively mapped to one of the at least two resource scheduling units Resource scheduling unit.
The method according to any one of claims 12 to 14, wherein the first PDCCH candidate is capability information of the plurality of PDCCH candidates and the terminal device, and the link quality of the first DCI is transmitted. a PDCCH candidate corresponding to at least one of the first DCIs.
The method according to claim 15, wherein the plurality of PDCCH candidates comprise a first PDCCH candidate set and a second PDCCH candidate set, wherein the PDCCH candidate in the first PDCCH candidate set includes n resource scheduling a m resource scheduling unit in the unit, the PDCCH candidate in the second PDCCH candidate set includes the n resource scheduling units, the m is smaller than the n, and the n is greater than or equal to 2;

The capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set;

The first PDCCH candidate is a PDCCH candidate in at least one PDCCH candidate corresponding to the first DCI in the second PDCCH candidate set.
The method according to claim 16, wherein the at least one PDCCH candidate comprises a first resource scheduling unit and a second resource scheduling unit, wherein the at least one PDCCH candidate comprises the first resource The scheduling unit belongs to the first resource set, the second resource scheduling unit included in the at least one PDCCH candidate belongs to the second resource set, and the second resource set is dedicated to the transmission of the first DCI, where the first The set of resources is also used for transmission of other DCIs than the first DCI.
The method of claim 17, wherein the method further comprises:

When the first DCI is not detected from the at least one DCCH candidate, the terminal device performs downlink data detection on a resource included in the first resource set.
The method according to claim 17 or 18, wherein said first set of resources comprises control A channel element CCE, the second resource set comprising an enhanced control channel element eCCE or a physical resource block PRB.
The method according to any one of claims 12 to 18, wherein the first PDCCH candidate comprises at least two of the following resource scheduling units:

CCE, eCCE and PRB.
The method according to claim 20, wherein when the first PDCCH candidate includes a PRB, the first DCI is common control information.
The method according to any one of claims 12 to 21, wherein if the first DCI is common control information, the initial scrambling sequences of the at least two resource scheduling units are the same.
A network device, comprising:

a determining unit, configured to determine a first physical downlink control channel PDCCH candidate for carrying a first DCI, where the first PDCCH candidate includes at least two resource scheduling units;

And a sending unit, configured to send, by using the first PDCCH candidate, the first DCI to the terminal device.
The network device according to claim 23, wherein the sending unit is specifically configured to:

Encoding the first DCI;

Performing rate matching on the encoded first DCI;

And transmitting, by the first PDCCH candidate, the rate-matched first DCI, where the first DCI after the rate matching is mapped on the at least two resource scheduling units.
The network device according to claim 23, wherein the sending unit is specifically configured to:

Encoding the first DCI;

Performing rate matching on the encoded first DCI multiple times;

Transmitting, by the multiple rate matching, the first DCI, where the first DCI after at least one rate matching is mapped on each of the at least two resource scheduling units, the multiple The first DCI after rate matching in rate matching is respectively mapped to one of the at least two resource scheduling units.
The network device according to any one of claims 23 to 25, wherein the first PDCCH candidate is capability information of the plurality of PDCCH candidates and the terminal device, and the link for transmitting the first DCI is a PDCCH candidate corresponding to at least one of the quality and the first DCI.
The network device according to claim 26, wherein the plurality of PDCCH candidates comprise a first PDCCH candidate set and a second PDCCH candidate set, wherein the PDCCH candidate in the first PDCCH candidate set includes n resources a m resource scheduling unit in the scheduling unit, the PDCCH candidate in the second PDCCH candidate set includes the n resource scheduling units, the m is smaller than the n, and the n is greater than or equal to 2;

The capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set;

The first PDCCH candidate is a PDCCH candidate in at least one PDCCH candidate corresponding to the first DCI in the second PDCCH candidate set.
The network device according to claim 27, wherein the at least one PDCCH candidate comprises a first resource scheduling unit and a second resource scheduling unit, wherein the at least one PDCCH candidate comprises the first type The resource scheduling unit belongs to the first resource set, the second resource scheduling unit included in the at least one PDCCH candidate belongs to the second resource set, and the second resource set is dedicated to the transmission of the first DCI, The first set of resources is also used for transmission of other DCIs than the first DCI.
The network device according to claim 28, wherein the first resource set is further configured to combine resource scheduling units of the third resource set for transmission of the second DCI, wherein the third resource set includes a second resource scheduling unit, the third resource set is dedicated to the transmission of the second DCI; the sending unit is further configured to:

When the current subframe does not need to send the second DCI, the data is transmitted on the resources included in the third resource set.
The network device according to claim 28 or 29, wherein the first resource set comprises a control channel element CCE, and the second resource set comprises an enhanced control channel element eCCE or a physical resource block PRB.
The network device according to any one of claims 23 to 29, wherein the first PDCCH candidate comprises at least two of the following resource scheduling units:

CCE, eCCE and PRB.
The network device according to claim 31, wherein when the first PDCCH candidate includes a PRB, the first DCI is common control information.
The network device according to any one of claims 23 to 32, wherein if the first DCI is common control information, the initial scrambling sequence of the at least two resource scheduling units is the same.
A terminal device, comprising:

a determining unit, configured to determine a first physical downlink control channel PDCCH candidate, where the first PDCCH candidate includes at least two resource scheduling units;

And a detecting unit, configured to detect the first PDCCH candidate to obtain a first DCI sent by the network device.
The terminal device according to claim 34, wherein the first DCI after rate matching is mapped on the at least two resource scheduling units.
The terminal device according to claim 34, wherein the first DCI after the rate matching is performed in the at least two resource scheduling units, wherein each of the at least two resource scheduling units Mapping, by the scheduling unit, the first DCI after at least one rate matching, where the first DCI after each rate matching in the multiple rate matching is respectively mapped to one resource of the at least two resource scheduling units Scheduling unit.
The terminal device according to any one of claims 34 to 36, wherein the first PDCCH candidate is capability information of the plurality of PDCCH candidates and the terminal device, and the link for transmitting the first DCI is a PDCCH candidate corresponding to at least one of the quality and the first DCI.
The terminal device according to claim 37, wherein the plurality of PDCCH candidates comprise a first PDCCH candidate set and a second PDCCH candidate set, wherein the PDCCH candidate in the first PDCCH candidate set includes n resources a m resource scheduling unit in the scheduling unit, the PDCCH candidate in the second PDCCH candidate set includes the n resource scheduling units, the m is smaller than the n, and the n is greater than or equal to 2;

The capability information of the terminal device and/or the PDCCH candidate set corresponding to the link quality of the first DCI is the second PDCCH candidate set;

The first PDCCH candidate is a PDCCH candidate corresponding to the first DCI in the second PDCCH candidate set.
The terminal device according to claim 38, wherein the at least one PDCCH candidate comprises a first resource scheduling unit and a second resource scheduling unit, wherein the at least one PDCCH candidate includes the first type The resource scheduling unit belongs to the first resource set, and the at least one PDCCH candidate includes the The second resource scheduling unit belongs to the second resource set, the second resource set is dedicated to the transmission of the first DCI, and the first resource set is further used for transmission of other DCIs except the first DCI. .
The terminal device according to claim 39, wherein the detecting unit is further configured to:

When the first DCI is not detected from the at least one PDCCH candidate, downlink data is detected on a resource included in the first resource set.
The terminal device according to claim 39 or 40, wherein the first resource set comprises a control channel element CCE, and the second resource set comprises an enhanced control channel element eCCE or a physical resource block PRB.
The terminal device according to any one of claims 34 to 41, wherein the first PDCCH candidate comprises at least two of the following resource scheduling units:

CCE, eCCE and PRB.
The terminal device according to claim 42, wherein when the first PDCCH candidate includes a PRB, the first DCI is common control information.
The terminal device according to any one of claims 34 to 43, wherein if the first DCI is common control information, the initial scrambling sequence of the at least two resource scheduling units is the same.