CN109391361B

CN109391361B - Method for detecting downlink control channel, terminal equipment and network equipment

Info

Publication number: CN109391361B
Application number: CN201710687773.5A
Authority: CN
Inventors: 夏金环; 吕永霞; 张磊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-08-11
Filing date: 2017-08-11
Publication date: 2021-02-26
Anticipated expiration: 2037-08-11
Also published as: WO2019029657A1; CN109391361A

Abstract

The application provides a method for detecting a downlink control channel, which can be applied to communication systems, such as V2X, LTE-V, V2V, Internet of vehicles, MTC, IoT, LTE-M, M2M, Internet of things and the like. The method comprises the following steps: the terminal equipment receives M candidate downlink control channel sets, wherein M is more than 1 and is an integer; the terminal equipment takes the M candidate control channel sets as M repeatedly-sent candidate downlink control channel sets, and detects a first downlink control channel; the terminal equipment receives N candidate downlink control channel sets, wherein N is not less than 1 and is an integer; and the terminal equipment takes the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeatedly-sent candidate downlink control channel sets, and detects a second downlink control channel, wherein M is greater than L, P is L + N, and L is an integer.

Description

Method for detecting downlink control channel, terminal equipment and network equipment

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a method, a terminal device, and a network device for detecting a downlink control channel.

Background

In a New Radio Access (NR) system, Ultra-high Reliability Low Latency Communication (URLLC) is an important application scenario, and it puts high demands on Low Latency at both the transmitting and receiving ends and Reliability of data transmission. Generally, in order to achieve a short delay, the complexity of transmission or detection may be reduced, but thereby reliability may not be guaranteed. In order to increase reliability, a robust mode is adopted, which brings about improvement of detection complexity of a receiving end, so that short time delay is difficult to realize.

Currently, a Physical Downlink Control Channel (PDCCH) in a 5G communication system is designed only for Evolved Mobile bandwidth (eMBB) service, and there is no special consideration for the URLLC service for a while. Specifically, a prototype of the design of the physical downlink Control channel is that the network device configures a terminal device with a terminal device specific Control Resource Set (CORESET), where the CORESET occupies 1, 2, or 3 OFDM symbols in the time domain, and the frequency domain includes 6,12, or 24 PRBs. The downlink control channel is transmitted within the CORESET.

In a conventional technical solution, a network device configures a CORESET in each subframe. Meanwhile, the network device configures a sending starting point of the downlink control channel and the maximum sending times of the downlink control channel for the terminal device through a high-level signaling. Since the higher layer signaling is not frequently sent, in order to adapt to the dynamic change of the channel, the number of times that the network device actually sends the downlink control channel does not necessarily reach the configured maximum sending number, but the maximum sending number is less than (or equal to) the interval between two sending start points. The terminal device will detect all possible locations for transmitting the downlink control channel at the interval between the two transmission start points until all locations are tried or the downlink control channel is detected.

In this technical solution, the network device may improve reliability of data transmission by repeating transmission, but since the network device configures a transmission starting point of the downlink control channel, and between two transmission starting points, even if there is a new downlink control channel that needs to be transmitted, the new downlink control channel cannot be transmitted, and the network device needs to wait until the next transmission starting point to transmit, which cannot meet the requirement of the URLLC service for low latency.

Disclosure of Invention

The application provides a method and a device for detecting a downlink control channel, which can reduce time delay while realizing high-reliability transmission of the downlink control channel.

In a first aspect, a method for detecting a downlink control channel is provided, including: the terminal equipment receives M candidate downlink control channel sets, wherein M is more than 1 and is an integer; the terminal equipment takes the M candidate control channel sets as M repeatedly-sent candidate downlink control channel sets, and detects a first downlink control channel; the terminal equipment receives N candidate downlink control channel sets, wherein N is not less than 1 and is an integer; and the terminal equipment takes the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeatedly-sent candidate downlink control channel sets, and detects a second downlink control channel, wherein M is greater than L, P is L + N, and L is an integer.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the terminal device, the second downlink control channel by using the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P candidate downlink control channel sets that are repeatedly transmitted includes: and when the first downlink control channel is not detected, the terminal equipment takes the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeatedly-sent candidate downlink control channel sets, and detects a second downlink control channel.

With reference to the first aspect, in some implementations of the first aspect, the terminal device uses L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P candidate downlink control channel sets that are repeatedly sent, and detects the second downlink control channel, further including: when the first downlink control channel is detected, the terminal equipment takes the N candidate control channel sets as N repeatedly-sent candidate downlink control channel sets, and detects a second downlink control channel; wherein N > 1 or N ═ M.

With reference to the first aspect, in certain implementations of the first aspect, P is M, and the L candidate sets of downlink control channels are M-L to M candidate sets of control channels of the M candidate sets of control channels.

With reference to the first aspect, in some implementations of the first aspect, each of the M candidate downlink control channel sets and the N candidate downlink control channel sets is located in a corresponding control resource set, where the control resource sets corresponding to the M candidate downlink control channel sets and the N candidate downlink control channel sets are both first control resource sets; or the control resource sets corresponding to the M candidate downlink control channel sets and the N candidate downlink control channel sets include a first control resource set and a second control resource set.

With reference to the first aspect, in some implementation manners of the first aspect, the M candidate downlink control channel sets and the control resource sets corresponding to the N candidate downlink control channel sets are respectively carried on different time-frequency resources.

With reference to the first aspect, in some implementations of the first aspect, M < Q or M ═ Q, Q is a number of repeated transmissions or a maximum number of repeated transmissions of the candidate downlink control channel, and Q is an integer.

With reference to the first aspect, in certain implementations of the first aspect, each of the candidate downlink control channel sets includes at least one candidate downlink control channel.

With reference to the first aspect, in some implementations of the first aspect, the repeatedly transmitted downlink control channels have the same aggregation level and/or the same search space within the M candidate downlink control channel sets.

With reference to the first aspect, in some implementations of the first aspect, before the terminal device detects the candidate downlink control channel on the set of control resources, the method further includes: the terminal equipment receives configuration information sent by the network equipment, wherein the configuration information comprises at least one of the following information: indicating a set of control resources; indicating that the candidate downlink control channel needs to be repeatedly transmitted; indicating the repeated sending times or the maximum repeated sending times of the candidate downlink control channels; indicating a corresponding downlink control information format when the candidate downlink control channel is repeatedly transmitted; indicating the aggregation level used when the candidate downlink control channel is repeatedly transmitted; and indicating a search space used when the candidate downlink control channel is repeatedly transmitted.

With reference to the first aspect, in some implementation manners of the first aspect, when the terminal device detects a candidate downlink control channel, for a downlink control channel repeatedly sent by the network device, a number of times that the terminal device combines a set of candidate control channels repeatedly sent in a single detection process is a preset value and/or a network configuration.

In a second aspect, a method for transmitting a downlink control channel is provided, where the method includes: the network equipment sends a first downlink control channel in M candidate downlink control channel sets, wherein the M candidate downlink control channel sets are used as M candidate downlink control channel sets sent repeatedly, M is more than 1 and is an integer; the network device takes L candidate downlink control channel sets and N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeatedly-sent candidate downlink control channel sets, the network device sends a second downlink control channel in the P candidate downlink control channel sets, M is greater than L, P is L + N, L is an integer, N is greater than or equal to 1, and N is an integer.

The network device in the embodiment of the present application is specifically an access network device.

With reference to the second aspect, in some implementations of the second aspect, the L sets of candidate downlink control channels are (M-L) th to M-th sets of candidate downlink control channels in the M sets of candidate downlink control channels.

With reference to the second aspect, in some implementations of the second aspect, each of the M candidate downlink control channel sets and the N candidate downlink control channel sets is located in a corresponding control resource set, where the control resource sets corresponding to the M candidate downlink control channel sets and the N candidate downlink control channel sets are both first control resource sets; or the control resource sets corresponding to the M candidate downlink control channel sets and the N candidate downlink control channel sets include a first control resource set and a second control resource set.

With reference to the second aspect, in some implementation manners of the second aspect, the M candidate downlink control channel sets and the control resource sets corresponding to the N candidate downlink control channel sets are respectively carried on different time-frequency resources.

With reference to the second aspect, in some implementations of the second aspect, M < Q or M ═ Q, Q is the number of repeated transmissions or the maximum number of repeated transmissions of the candidate downlink control channel by the network device, and Q is an integer.

With reference to the second aspect, in some implementations of the second aspect, each candidate downlink control channel set includes at least one candidate downlink control channel.

With reference to the second aspect, in some implementations of the second aspect, the repeatedly transmitted downlink control channels have the same aggregation level and/or the same search space within the M candidate downlink control channel sets.

With reference to the second aspect, in some implementations of the second aspect, before the network device sends the downlink control channels in the M candidate downlink control channel sets, the method further includes: the network equipment sends configuration information to the terminal equipment, wherein the configuration information comprises at least one of the following information: indicating the first set of control resources and/or the second set of control resources; indicating that the candidate downlink control channel needs to be repeatedly transmitted; indicating the repeated sending times or the maximum repeated sending times of the candidate downlink control channels; indicating a corresponding downlink control information format when the candidate downlink control channel is repeatedly transmitted; indicating the aggregation level used when the candidate downlink control channel is repeatedly transmitted; and indicating a search space used when the candidate downlink control channel is repeatedly transmitted.

In a third aspect, a terminal device is provided, where the terminal device has a function of implementing the terminal device in the method design of the first aspect. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In a fourth aspect, a network device is provided, which has the function of implementing the network device in the method design of the second aspect. These functions may be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

In a fifth aspect, a terminal device is provided that includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve and execute the computer program from the memory, so that the terminal device performs the method of the first aspect.

In a sixth aspect, a network device is provided that includes a transceiver, a processor, and a memory. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve and execute the computer program from the memory, so that the network device performs the method of the second aspect.

In a seventh aspect, a communications apparatus is provided. The communication device may be the terminal device designed in the above method, or a chip provided in the terminal device. The communication device includes: a memory for storing computer executable program code; a communication interface, and a processor coupled with the memory and the communication interface. Wherein the program code stored in the memory comprises instructions which, when executed by the processor, cause the communication apparatus to perform the method performed by the terminal device of any one of the possible designs of the first or second aspect.

In an eighth aspect, a communication device is provided. The communication device may be a network device designed by the method or a chip arranged in the network device. The communication device includes: a memory for storing computer executable program code; a communication interface, and a processor coupled with the memory and the communication interface. Wherein the program code stored in the memory comprises instructions which, when executed by the processor, cause the communication apparatus to perform the method performed by the network device of any one of the possible designs of the first or second aspect.

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

In a tenth aspect, a computer-readable medium is provided, having program code stored thereon, which, when run on a computer, causes the computer to perform the method of the above aspects.

In an eleventh aspect, there is provided a chip comprising a processor and a memory, the memory being configured to store a computer program, the processor being configured to retrieve and run the computer program from the memory, the computer program being configured to implement the method in the above aspects.

According to the technical scheme of the embodiment of the application, when the network device sends the downlink control channel to the terminal device, the limitation of a sending starting point is avoided, or in the process of repeatedly sending one downlink control channel, the repeated sending of another downlink control channel can be started. Therefore, when detecting the downlink control channel, the terminal device may detect any one of the received downlink control channels as one repeatedly transmitted downlink control channel, or may detect the received downlink control channel as one first transmitted downlink control channel. By adopting the sending mechanism, the time delay can be reduced while the downlink control channel is repeatedly sent to ensure high reliability.

Drawings

Fig. 1 is a schematic diagram of a wireless communication system suitable for use with embodiments of the present application.

Fig. 2 is a diagram of a downlink control channel.

Fig. 3 is a diagram of transmitting a downlink control channel.

Fig. 4 is an interaction diagram of a method for detecting a downlink control channel according to an embodiment of the present application.

Fig. 5 is a mapping manner of CORESET in time domain.

Fig. 6 is another mapping manner of CORESET in time domain.

Fig. 7 is a schematic diagram of two CORESET frequency division multiplexing.

Fig. 8 is a schematic diagram of time division multiplexing of two CORESET.

Fig. 9 is a schematic diagram of two CORESET time division multiplexing and frequency division multiplexing.

Fig. 10 is an example of blind detection of PDCCH by a terminal device.

Fig. 11 is a schematic block diagram of a terminal device 500 according to an embodiment of the present application.

Fig. 12 is a schematic block diagram of a terminal network device 600 according to an embodiment of the present application.

Fig. 13 is a schematic structural diagram of a terminal device 700 according to an embodiment of the present application.

Fig. 14 is a schematic block diagram of a network device 800 according to an embodiment of the present application.

Detailed Description

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

Fig. 1 is a schematic diagram of a wireless communication system suitable for use in embodiments of the application. At least one network device may be included in the wireless communication system, the network device communicating with one or more terminal devices (e.g., terminal device #1 and terminal device # 2). The network device may be a base station, or a device formed by integrating the base station and a base station controller, or another device having a similar communication function.

The wireless communication system mentioned in the embodiments of the present application includes but is not limited to: narrow Band Internet of Things (NB-IoT), Global System for Mobile Communications (GSM), Enhanced Data rates for GSM Evolution (EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access 2000 (Code Division Multiple Access, CDMA2000), Time Division synchronous Code Division Multiple Access (Time Division-Synchronization Code Division Multiple Access, TD-SCDMA), Long Term Evolution (Long Term Evolution, LTE), Universal Mobile communication System (Universal Mobile Telecommunications System, UMTS), Worldwide Interoperability for Microwave Access (WiMAX), future-Generation application of the third Generation (NR 5) or future-Generation Mobile Radio System (NR), eMBB), high-reliability Low Latency Communication (URLLC), and enhanced mass Machine Type Communication (eMTC), or new Communication systems emerging in the future.

Terminal equipment in the embodiments of the present application may refer to user equipment, access terminals, subscriber units, subscriber stations, mobile stations, remote terminals, mobile devices, user terminals, wireless communication devices, user agents, or user devices. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

The Network device in the embodiment of the present application may be a device for communicating with a terminal device, where the Network device may be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) System or a Code Division Multiple Access (CDMA) System, may also be a Base Station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) System, may also be an evolved node b (eNB, or eNodeB) in an LTE System, and may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or the network device may be a relay station, a Transmission and Reception Point (TRP), an access Point, a vehicle-mounted device, a wearable device, a network device in a future 5G network or a network device in a future evolved PLMN network, and the like, and the embodiment of the present application is not limited.

For ease of understanding, the related art to which this application relates will first be briefly described.

In 5G communication systems, the design of the downlink control channel in question is only for the eMBB service, and there is no special consideration for the URLLC service. The prototype of the downlink Control channel is that the network device configures a terminal device with a terminal device specific Control Resource Set (CORESET), where the Control Resource Set includes time domain resources and frequency domain resources. For example, 1, 2 or 3 OFDM symbols are included in the time domain. The number of PRBs included in the frequency domain is 6,12,24, etc. The downlink control channel is transmitted within the CORESET. CORESET is typically configured periodically, e.g., once per slot. The network device configures the period for the UE to detect the PDCCH. In general, the configuration period of the CORESET is the period of the UE detecting the PDCCH. Optionally, the network device may configure the UE to detect the downlink control channel at a partial CORESET position, that is, a period for the UE to detect the PDCCH is greater than a configured period for the CORESET.

Referring to fig. 2, fig. 2 is a schematic diagram of a downlink control channel. The CORESET appears once per slot, wherein the CORESET occupies 2 OFDM symbols in the time domain, i.e., OFDM Symbol (denoted as OS), and occupies 6 PRBs in the frequency domain.

One solution is to configure a core set for transmitting a downlink control channel in each subframe. The network device configures a sending starting point of a downlink control channel and the maximum sending times of the downlink control channel for the terminal device through a high-level signaling. For example, the maximum number of times of transmission configured by the higher layer signaling is 16, and the network device may transmit only 1 time, or 2 times, or 4 times, or 8 times, or 16 times when actually transmitting the downlink control channel.

Referring to fig. 3, fig. 3 is a diagram illustrating transmission of a downlink control channel. As shown in fig. 3, the downlink control channel is repeatedly transmitted between two transmission start points, that is, if there is new downlink control information to be transmitted, the downlink control channel can only be transmitted until the next transmission start point. For example, the maximum number of transmissions configured by the network device is equal to 8, and if the actual transmissions are transmitted only 1 time, there are 8 transmission positions. If sent 2 times, there are 4 locations sent. If transmitted 4 times, there are 2 transmitted positions. If the transmission is made 8 times, there is only one transmitted location. These positions constitute candidate positions for the network device to transmit the PDCCH. The UE needs to attempt to detect the downlink control channel at these locations until all locations are tried or until the downlink control channel is detected.

However, in this scheme, since the transmission start point for transmitting the downlink control channel is configured in the higher layer, the maximum number of times of repeated transmission is smaller than the interval between two transmission start points. Between two transmission start points, even if new downlink control information needs to be transmitted, the downlink control information cannot be transmitted, and the downlink control information can only be transmitted until the next transmission start point. The low delay requirement of URLLC cannot be met.

Therefore, the embodiment of the present application provides a method for detecting a downlink control channel, which can reduce a time delay while ensuring a high reliability requirement of the URLLC.

The following describes a method 100 for detecting a downlink control channel provided in the present application.

Referring to fig. 4, fig. 4 is an interaction diagram of a method for detecting a downlink control channel according to an embodiment of the present application.

110. The access network equipment sends the first downlink control channel in the M candidate downlink control channel sets. And the terminal equipment receives the M candidate downlink control channel sets sent by the access network equipment.

120. And the terminal equipment takes the M candidate downlink control channel sets as M repeatedly-sent candidate downlink control channel sets and detects the first downlink control channel.

130. The access network equipment sends a second downlink control channel in the N candidate downlink control channel sets, and the terminal equipment receives the N candidate downlink control channels sent by the access network equipment.

140. And the terminal equipment takes the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeatedly-sent candidate downlink control channel sets, and detects a second downlink control channel.

In the embodiment of the present application, in order to meet the requirements of the URLLC scenario on high reliability and low delay, on the one hand, the access network device continues to use a repeated transmission mode to ensure high reliability of downlink control channel reception. At the same time, in order to reduce the delay, the access network equipment does not set a transmission starting point for transmitting the downlink control channel. In other words, the access network device may also start transmission of another downlink control channel during the process of repeatedly transmitting one downlink control channel.

Due to the behavior of the access network device, when detecting the candidate downlink control channel, the terminal device cannot know whether the currently received candidate downlink control channel is a repeatedly transmitted downlink control channel or a downlink control channel transmitted by the access network device for the first time.

Based on the change, when the terminal device detects the downlink control channel sent by the access network device accurately, the process of detecting the downlink control channel is different from the existing scheme accordingly.

The following describes in detail a process of detecting a downlink control channel by a terminal device in this embodiment.

In step 110, the terminal device receives M candidate downlink control channel sets. At this time, the terminal device regards the M candidate downlink control channel sets as M repeatedly transmitted downlink control channel sets, and detects the first downlink control channel set.

In other words, the terminal device does not know whether all of the M candidate downlink control channel sets are used for repeatedly transmitting a certain downlink control channel, or the M candidate downlink control channel sets include the first transmission and the subsequent repeated transmission of another downlink control channel in addition to the repeatedly transmitted certain downlink control channel. Therefore, the terminal device first "regards" the M candidate downlink control channel sets as the repeatedly transmitted candidate downlink control channel set, and detects the first downlink control channel.

If the first downlink control channel is detected, the M candidate downlink control channel sets are indicated to be used for repeated transmission of the first downlink control channel. Next, if the terminal device receives N candidate downlink control channels again, at this time, the terminal device may use the N candidate downlink control channels as N candidate downlink control channels that are repeatedly transmitted, and detect the second downlink control channel.

If the first downlink control channel is not detected, the terminal device may consider that the M candidate downlink control channel sets may include a downlink control channel different from the first downlink control channel, which is started to be repeatedly sent by the access network device, so that an error is detected. Therefore, the terminal device will slide back one receiving window and then re-detect the second downlink control channel. Wherein the size of the sliding receive window may be predefined or configured on the network side.

Specifically, when the terminal slides the receiving window, only one detection opportunity of the candidate downlink control channel set is slid every time. For example, each time slot of the terminal is used as a detection opportunity, and the terminal device receives and detects the candidate downlink control channel set at each detection opportunity, at this time, the size of the sliding window is 1 time slot, and the receiving window needs to slide to the next candidate downlink control channel detection opportunity when sliding.

Alternatively, the receiving window may be slid M/2 detection opportunities or M detection opportunities at a time, etc. The size of the receiving window of the terminal is related to the number of times that the access network device repeatedly sends the downlink control channel, the terminal receives the downlink control channel repeatedly sent by the access network device in one receiving window and performs merging detection, and the size of the receiving window can be predefined or configured at the network side. For example, the receiving window may be the time occupied by the downlink control channel set repeatedly transmitted M/4 times or M/2 times or M times. It should be noted that, when detecting the downlink control channel after the terminal device slides one window, it is possible to detect the first downlink control channel and also possible to detect the second downlink control channel, where the second downlink control channel is different from the first downlink control channel.

It should be noted that the candidate downlink control channel set, that is, the search space, is a transmission position that may be used when the access network device transmits the downlink control channel. When the access equipment transmits the downlink control channel, the access equipment can use any position in the search space for transmission, and the any position is called as a candidate downlink control channel or a candidate position for transmitting the downlink control channel. The terminal device does not know at which candidate position the access network device sent before correctly detecting the downlink control channel, and therefore, the terminal device needs to receive the entire set of candidate downlink control channels and then try to detect the downlink control channel at each candidate position in the search space. After the access network device selects the candidate position, the access network device only needs to send the downlink control channel sent at the candidate position to the terminal device, and does not need to send the downlink control channel by using the whole candidate downlink control channel set or send the whole candidate downlink control channel set to the terminal device. Alternatively, the access network device may send two or more downlink control channels at multiple candidate positions in the candidate downlink control channel set, where the two or more downlink control channels are mapped to different candidate downlink control channel positions, respectively. For the same terminal device, when the access network device sends a downlink control channel to the terminal device, in the sending process of the first downlink control channel, a second downlink control channel may be sent, and the first downlink control channel is different from the second downlink control channel and is respectively mapped on different candidate downlink control channel positions in the candidate downlink control channel set.

In the above, from the perspective of the terminal device, the process of detecting the downlink control channel according to the embodiment of the present application is described.

In conjunction with the above, the downlink control channel in the 5G system is transmitted on a control resource set (i.e., CORESET), so there are many specific implementations of the embodiment of the present application.

Each of the M candidate downlink control channel sets and the N candidate downlink control channel sets sent by the access network device is located in a corresponding control resource set.

Optionally, the control resource sets corresponding to the M candidate downlink control channel sets and the N candidate downlink control channel sets are both the first control resource set. That is, the access network device sends the M candidate downlink control channels and the N candidate downlink control channels through the same configured control resource set.

Optionally, each of the control resource sets corresponding to the M candidate downlink control channel sets and the N candidate downlink control channel sets is located in a corresponding control resource set, and includes a first control resource set and a second control resource set.

That is, the access network device may send the M candidate downlink control channels and the N candidate downlink control channels through at least two control resource sets with different configurations. The M candidate downlink control channel sets may be located in the same control resource set, or may be located in at least two different control resource sets. The N candidate downlink control channel sets may be located in the same control resource set, or may be located in at least two different control resource sets. Each control resource set belongs to a control resource set configuration. Different control resource sets belong to different control resource set configurations.

It should be noted here that the configuration of the control resource set includes how many symbols the control resource set occupies in time, how many resources the control resource set occupies in the frequency domain, and the position on the frequency band, and the period in which the control resource set appears, and also includes the subcarrier spacing of the control resource set, the format of the transmitted downlink control information, the aggregation level used for transmitting the downlink control channel, the number of search spaces in which the terminal detects the downlink control channel, the demodulation reference signal of the control resource set, the power allocation parameter, and so on. Therefore, it can be said that the two control resource sets can be distinguished from each other by the difference of the configuration, for example, if only one parameter is different in the two configurations, it can be said that the two control resource sets are respectively configured.

In a possible implementation manner, before detecting the candidate downlink control channel, the terminal device may receive configuration information sent by the access network device, where the configuration information includes at least one of the following information:

indicating the first set of control resources and/or the second set of control resources;

indicating that the candidate downlink control channel needs to be repeatedly transmitted;

indicating the repeated sending times or the maximum repeated sending times of the candidate downlink control channels;

indicating a corresponding downlink control information format when the candidate downlink control channel is repeatedly transmitted;

indicating the aggregation level used when the candidate downlink control channel is repeatedly transmitted;

and indicating a search space used when the candidate downlink control channel is repeatedly transmitted.

The access network device may send the configuration information to the terminal device through a higher layer signaling before sending the downlink control channel, and the configuration information may include at least one of the above information. In other words, the above information can be pre-configured by the access network device.

In addition, the access network may also instruct the terminal device to detect the candidate downlink control channel by using the behavior of detecting the downlink control channel described in the above step 110-140 in the configuration information. That is, the behavior of the terminal device to blindly detect PDCCH is configurable. The terminal device may also detect the PDCCH using other detection actions. For example, it is assumed that the first repeated transmission of the downlink control channel occurs only at certain CORESET, and these "certain CORESET" may also be configured by the network side.

Assuming that the access network device indicates the number of repeated transmissions or the maximum repeated transmission (hereinafter referred to as Q) in the configuration information, M in the above may be equal to Q, or less than Q, where Q is an integer.

In other words, when the terminal device blindly detects the downlink control channel, the terminal device may perform the merging detection only when the received candidate downlink control channel set reaches the number of repeated transmissions configured by the network side or the maximum number of repeated transmissions.

In addition, when the terminal device blindly detects the downlink control channel on the CORESET, the aggregation level and the search space used by the downlink control channel may be configured by the access network device to the terminal device.

For example, the access network device configures the aggregation levels of the blind detection of the terminal device to be 4, 8 and 16. The search spaces corresponding to the aggregation level of 4 are SS4_1 and SS4_ 2. The search spaces corresponding to the aggregation level of 8 are SS8_1, SS8_2, etc., and the search spaces corresponding to the aggregation level of 16 are SS16_1, SS16_ 2. The terminal detects downlink control channels in search spaces SS4_1, SS4_2, SS8_1, SS8_2 and SS16_1, SS16_2 on each CORESET until detection is performed in all search spaces or until a downlink control channel needing detection is detected.

The following describes a mapping manner of the downlink control channel on the CORESET.

It should be noted that, the core set is configured by the access device to the terminal device, and generally, the configured core set occurs periodically, for example, once per timeslot, and when the duration of the core set is less than 1 timeslot, the configured core set is discontinuous in time; the configured CORESET may also occur once per symbol and the duration of the CORESET in time is one symbol, such that the configured CORESET is continuous in time.

Mode 1

The downlink control channel is mapped on the CORESET and the time frequency resources except the CORESET, and the time frequency resources except the CORESET refer to other time frequency resources on the same system carrier with the CORESET.

Referring to fig. 5, fig. 5 is a mapping manner of CORESET in time domain. As shown in fig. 5, CORESET is non-contiguous in the time domain, e.g., may occur every 2 OFDM symbols.

In the mode 1, the access network device may perform repeated transmission of the downlink control channel on a time domain symbol between two consecutive CORESET. That is, all downlink control channels are not transmitted on the core set, and after an access network device starts to transmit a downlink control channel on a certain core set, the access network device may repeat transmission of the downlink control channel on an available downlink time domain symbol after the core set.

It can be understood that if the available downlink time domain symbols between two CORESET are sufficient to map the number of retransmissions of the downlink control channel, the access network device can complete the retransmission of the downlink control channel before the next CORESET occurs. Therefore, the repeated transmission of the PDCCH can be completed as soon as possible in a short time, and the time delay of the terminal equipment for detecting the PDCCH is shortened.

In a possible case, the available downlink time domain symbols between two consecutive CORESET are not enough to map the number of repeated transmission of the PDCCH, and then, the number of repeated transmission of the PDCCH may also be mapped on the next occurring CORESET. In this case, too, the repeated transmission of the PDCCH can be completed as soon as possible, shortening the time delay for the terminal device to acquire the detected PDCCH.

It should be noted that two consecutive CORESETs described herein may belong to the same CORESET configuration, or may belong to different CORESETs configurations. When belonging to the same CORESET configuration, the two CORESET resources which appear in the CORESET period are referred to.

Mode 2

The downlink control channel is mapped only on the CORESET.

The CORESET may or may not be continuous in the time domain.

When the CORESET is non-contiguously distributed in the time domain, repeated transmission of the PDCCH may be mapped only on the CORESET, and available time-domain symbols between every two CORESETs may be allocated to other terminal devices. That is, for one terminal device, the repeated transmission of the PDCCH is only mapped on the core set configured for the terminal device by the access network device, and the time domain resource between two adjacent core sets in the time domain is allocated to the other terminal device for transmitting the downlink control channel. Therefore, the blocking probability of the access network equipment transmitting the downlink control channel to other terminal equipment can be reduced.

For example, if the core set configured by the access network device for the terminal device a is discontinuous in the time domain, the time domain resource between two consecutive core sets may be configured to the terminal device B for sending the downlink control channel to the terminal device B. If the terminal device a occupies the time domain resources, the time domain resources cannot be configured to the terminal device B, and therefore, the time delay of the terminal device B detecting the downlink control channel is increased.

When the CORESET is continuously distributed in the time domain, as shown in fig. 6, the CORESET is continuous in the time domain, and may occur once per OFDM symbol, for example. The downlink control channel is mapped on continuous CORESET resources.

It should be noted that consecutive CORESET described herein may belong to the same CORESET configuration, or may belong to different CORESET configurations. When belonging to the same CORESET configuration, the two CORESET resources which appear in the CORESET period are referred to.

The mapping manners of the CORESET in the time domain may be configured by the access network device to the terminal device.

Optionally, in this embodiment of the present application, when configuring a core set for a terminal device, an access network device may configure at least two core sets for the terminal device, and associate the at least two core sets with the same downlink control information format respectively.

It should be understood that the two CORESET configurations referred to herein refer to two CORESET configurations that differ.

Here, it should be noted that associating the at least two CORESET with the same downlink control information format refers to a control channel on the at least two CORESET that can transmit the downlink control information format.

For example, the access network device configures 2 types of core sets for the terminal device a, and if the 2 types of core sets are respectively associated with the same downlink control information format (denoted as downlink control information format #1), the downlink control channel carrying the downlink control information format #1 may be transmitted in the 2 types of core sets.

Optionally, the at least two CORESET mapping manners include, in the time domain: time division multiplexing, frequency division multiplexing, time division multiplexing and frequency division multiplexing.

Referring to fig. 7, fig. 7 is a schematic diagram of two CORESET frequency division multiplexing. As shown in fig. 7, at a certain time, the access network device configures two types of core sets for one terminal device. The PDCCH sent by the access network device to the terminal device is mapped repeatedly in the two CORESET types.

Referring to fig. 8, fig. 8 is a schematic diagram of time division multiplexing of two CORESET types. As shown in fig. 8, the access network device configures two types of CORESET for one terminal device, and the two types of CORESET are time-division multiplexed.

Referring to fig. 9, fig. 9 is a schematic diagram of two CORESET time division multiplexing and frequency division multiplexing.

It can be understood that if a search space used when a downlink control channel is repeatedly transmitted is not included in a CORESET, the repeatedly transmitted downlink control channel is considered to have no mapping in the CORESET.

The above mapping method of the downlink control channel on the CORESET, for example, the

above mapping methods

1 and 2 and the mapping methods in fig. 7 to 9, may be used alone. For example, when the access network device transmits the downlink control channel, the access network device may transmit the downlink control channel in one configuration or multiple configurations of core set by using the manner 1 and the manner 2 and the mapping manners in fig. 7 to fig. 9.

Alternatively, the method for sending the downlink control channel provided by the present application and the mapping manner of the downlink control channel on the CORESET may be used in combination. For example, the M candidate downlink control channel sets and the N candidate downlink control channel sets sent by the access network may be sent in the same configured or different configured CORESET, and the mapping manner of the downlink control channels on the same configured or different configured CORESETs may be as in any one of manner 1 and manner 2 in the foregoing and fig. 7 to fig. 9.

In summary, in the embodiment of the present application, the access network device may send any PDCCH to the terminal device on any available CORESET. Correspondingly, when the terminal device detects the PDCCH blindly, if the terminal device detects the PDCCH on one of the CORESET, the terminal device considers that the repeated transmission of the PDCCH may be started on any of the CORESET. In other words, the terminal device does not know that the PDCCH currently received is the number of transmissions by the access network device. Therefore, in the embodiment of the present application, the terminal device performs blind detection on the PDCCH in a manner different from blind detection in the prior art, so as to correctly decode the PDCCH.

Referring to fig. 10, fig. 10 is an example of blind detection of a PDCCH by a terminal device in the embodiment of the present application.

The access network equipment repeatedly transmits the PDCCH on the CORESET which is configured for the terminal equipment and appears periodically. For example, the access network device starts the repeated transmission of PDCCH1 on CORESET #1, and performs the 1 st repeated transmission (i.e., 2 nd transmission) of PDCCH1 on CORESET # 2. Meanwhile, the access network device starts the 1 st transmission of PDCCH #2 on CORESET #2 and performs the 2 nd transmission of PDCCH2 on CORESET # 3. It should be noted that the CORESET #1, the CORESET #2, and the CORESET #3 belong to the same CORESET configuration, or may belong to different CORESET configurations. When the access network equipment simultaneously transmits PDCCH1 and PDCCH2 on CORESET #2, PDCCH1 and PDCCH2 are respectively mapped on different candidate PDCCH positions on CORESET # 2.

When the terminal device receives the PDCCH in core set #2, it cannot know that this is the number of times of repeated transmissions of the downlink control channel that the access network device repeatedly transmits. Therefore, the terminal device may consider that the first transmission of the currently received PDCCH may be started on any one of the CORESET.

For example, the terminal device may assume that the PDCCH currently received is detected to be the 1 st retransmission performed by the access network device, and if the number of retransmissions N configured by the access network device is equal to 4, there will be 3 subsequent retransmissions. Alternatively, the terminal device may assume that the received PDCCH has already started to repeat transmission before the currently detected CORESET, and the currently detected CORESET is one of the repeated transmissions, for example, 2 nd, 3 rd, or 4 th.

The terminal device decodes the detected PDCCH, depending on the implementation. For example, the terminal device assumes that the currently detected PDCCH is the first repeated transmission by the access network device, i.e., the PDCCH is repeatedly transmitted from the currently detected CORESET, and the terminal device can decode the PDCCH separately. Alternatively, the terminal device may not perform the processing first, and perform the merging decoding when receiving the PDCCH on the subsequent CORESET. For another example, assuming that the currently received PDCCH starts to be repeatedly transmitted on one of the CORESET before the currently detected CORESET, the terminal device may combine and decode the currently detected PDCCH and the PDCCH detected several times (for example, 1 time, 2 times, 3 times, or the like) before the currently detected CORESET.

The embodiment of the present application does not limit the process of decoding the downlink control channel. When detecting the candidate downlink control channels, the terminal device is configured with a preset value and/or access network device according to how many times of combination as one detection.

For example, a detection rule may be predefined on the network side. The number of repeated transmissions configured by the access network device is recorded as N, and the access network device may define the detection rule as combining the nth/4 th repeated transmission and the nth/2 nd repeated transmission as one decoding.

According to the technical scheme provided by the embodiment of the application, when the network equipment sends the downlink control channel to the terminal equipment, the limitation of a sending starting point is avoided, or in the process of repeatedly sending one downlink control channel, the repeated sending of another downlink control channel can be started. Therefore, when detecting the downlink control channel, the terminal device may detect any one of the received downlink control channels as one repeatedly transmitted downlink control channel, or may detect the received downlink control channel as one first transmitted downlink control channel. By adopting the sending mechanism, the time delay can be reduced while the downlink control channel is repeatedly sent to ensure high reliability.

The method for detecting a downlink control channel according to the embodiment of the present application is described in detail above with reference to fig. 1 to 10, and the access network device and the terminal device according to the embodiment of the present application are described below with reference to fig. 11 to 14.

Fig. 11 is a schematic block diagram of a terminal device 500 according to an embodiment of the present application. As shown in fig. 11, the terminal device 500 includes:

a receiving unit 510, configured to receive M candidate downlink control channel sets, where M > 1 and M is an integer;

a processing unit 520, configured to use the M candidate downlink control channel sets as M candidate downlink control channel sets that are repeatedly sent, and detect a first downlink control channel;

a receiving unit 510, further configured to receive N candidate downlink control channel sets, where N is greater than or equal to 1 and is an integer;

the processing unit 520 is further configured to use L candidate downlink control channel sets in the M candidate downlink control channel sets and the N candidate downlink control channels as P candidate downlink control channel sets that are repeatedly transmitted, and detect a second downlink control channel, where M is greater than L, P is L + N, and L is an integer.

Each unit and the other operations or functions in the terminal device 500 in the embodiment of the present application are respectively for implementing a corresponding process executed by the terminal device in the method for detecting a downlink control channel. For brevity, no further description is provided herein.

Fig. 12 is a schematic block diagram of an access network device 600 according to an embodiment of the present application. As shown in fig. 12, the access network apparatus 600 includes a processing unit 610 and a transmitting unit 620. Wherein, the processing unit 610 is configured to control the sending unit to execute the following steps:

sending a first downlink control channel in M candidate downlink control channel sets, wherein the M candidate downlink control channel sets are used as M candidate downlink control channel sets which are sent repeatedly, M is more than 1 and M is an integer;

and taking L candidate downlink control channel sets and N candidate downlink control channel sets in the M candidate downlink control channel sets as P candidate downlink control channel sets which are repeatedly sent, and sending a second downlink control channel in the P candidate downlink control channel sets, wherein M is greater than L, P is L + N, L is an integer, N is greater than or equal to 1, and N is an integer.

Fig. 13 is a schematic structural diagram of a terminal device 700 according to an embodiment of the present application. As shown in fig. 13, the terminal device 700 includes: one or more processors 701, one or more memories 702, one or more transceivers 703. The processor 701 is configured to control the transceiver 703 to transceive signals, the memory 702 is configured to store a computer program, and the processor 701 is configured to call and execute the computer program from the memory 702, so that the terminal device performs corresponding procedures and/or operations in the method embodiment of detecting a downlink control channel. For brevity, no further description is provided herein.

The terminal device 500 shown in fig. 11 can be implemented by the terminal device 700 shown in fig. 13. For example, the receiving unit 510 shown in fig. 11 may be implemented by the transceiver 703, the processing unit 520 may be implemented by the processor 701, and the like.

Fig. 14 is a schematic structural diagram of a network device 800 according to an embodiment of the present application. As shown in fig. 14, the access network apparatus 800 includes: one or more processors 801, one or more memories 802, one or more transceivers 803. The processor 801 is configured to control the transceiver 803 to transceive signals, the memory 802 is configured to store a computer program, and the processor 801 is configured to call and execute the computer program from the memory 802, so that the network device executes corresponding procedures and/or operations in the method embodiment of transmitting a downlink control channel. For brevity, no further description is provided herein.

Similarly, the access network device 600 shown in fig. 12 may be implemented by the access network device 800 shown in fig. 14. For example, the transmitting unit 610 shown in fig. 12 may be implemented by the transceiver 803 shown in fig. 14.

In the above embodiments, the processor may be a Central Processing Unit (CPU), a microprocessor, an Application-Specific Integrated Circuit (ASIC), or one or more Integrated circuits for controlling the execution of the program in the present Application. For example, a processor may be comprised of a digital signal processor device, a microprocessor device, an analog to digital converter, a digital to analog converter, and so forth. The processor may distribute the control and signal processing functions of the mobile device between these devices according to their respective functions. Further, the processor may include functionality to operate one or more software programs, which may be stored in the memory.

The functions of the processor can be realized by hardware, and can also be realized by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

The Memory may be a Read-Only Memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions. But is not limited to, Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM) or other optical disk storage, optical disk storage (including Compact Disc, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

Alternatively, the memory and the storage may be physically separate units, or the memory and the processor may be integrated together.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

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

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

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

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

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

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for receiving a downlink control channel, comprising:

the terminal equipment receives M candidate downlink control channel sets, wherein M is more than 1 and is an integer;

the terminal equipment takes the M candidate control channel sets as M repeatedly-sent candidate downlink control channel sets, and detects a first downlink control channel;

the terminal equipment receives N candidate downlink control channel sets, wherein N is not less than 1 and is an integer;

and when the first downlink control channel is not detected, the terminal device takes L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeatedly-sent candidate downlink control channel sets, and detects a second downlink control channel, wherein M is greater than L, P is L + N, and L is an integer.

2. The method of claim 1, further comprising:

when the first downlink control channel is detected, the terminal device takes the N candidate control channel sets as N repeatedly-sent candidate downlink control channel sets, and detects a second downlink control channel; wherein N > 1 or N ═ M.

3. The method of claim 1, wherein P is M, and wherein the L sets of candidate downlink control channels are M-L to M sets of candidate downlink control channels in the M sets of candidate control channels.

4. The method of claim 1, wherein each of the M candidate sets of downlink control channels and the N candidate sets of downlink control channels is located in a corresponding set of control resources, and wherein,

the control resource sets corresponding to the M candidate downlink control channel sets and the N candidate downlink control channel sets are first control resource sets; or

The control resource sets corresponding to the M candidate downlink control channel sets and the N candidate downlink control channel sets include a first control resource set and a second control resource set.

5. The method of claim 1, wherein M < Q or M ═ Q, Q is a number of repeated transmissions or a maximum number of repeated transmissions of the candidate downlink control channels transmitted by the network device, and Q is an integer.

6. The method of claim 1, wherein each of the candidate downlink control channel sets comprises at least one candidate downlink control channel.

7. The method of claim 1, wherein the repeatedly transmitted downlink control channels have the same aggregation level and/or the same search space within the M candidate downlink control channel sets.

8. The method of claim 1, wherein before the terminal device detects the candidate downlink control channel on the set of control resources, the method further comprises:

the terminal equipment receives configuration information from network equipment, wherein the configuration information comprises at least one of the following information:

9. The method according to claim 1, wherein when detecting the candidate downlink control channels, for the downlink control channels repeatedly transmitted by the network device, the number of times that the terminal device combines the candidate control channel sets repeatedly transmitted in one detection process is a preset value and/or a network configuration.

10. A method for transmitting a downlink control channel, comprising:

the network equipment sends a first downlink control channel in M candidate downlink control channel sets, wherein the M candidate downlink control channel sets are used as M candidate downlink control channel sets sent repeatedly, M is larger than 1 and is an integer;

the network device takes L candidate downlink control channel sets and N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeatedly-sent candidate downlink control channel sets, the network device sends a second downlink control channel in the P candidate downlink control channel sets, M is greater than L, P is L + N, L is an integer, N is greater than or equal to 1 and N is an integer, so that when the terminal device does not detect the first downlink control channel, the L candidate downlink control channel sets in the M candidate downlink control channel sets and the N candidate downlink control channel sets are taken as the P repeatedly-sent candidate downlink control channel sets to detect the second downlink control channel.

11. The method of claim 10, wherein the L sets of candidate downlink control channels are (M-L) th to M-th sets of candidate downlink control channels in the M sets of candidate downlink control channels.

12. The method according to claim 10 or 11, wherein each of the M candidate downlink control channel sets and the N candidate downlink control channel sets is located in a corresponding control resource set, wherein,

the control resource sets corresponding to the M candidate downlink control channel sets and the N candidate downlink control channel sets are first control resource sets; alternatively, the first and second electrodes may be,

13. The method according to claim 10 or 11, wherein M < Q or M ═ Q, Q is the number of repeated transmissions or the maximum number of repeated transmissions of the candidate downlink control channels transmitted by the network device, and Q is an integer.

14. The method according to claim 10 or 11, wherein each candidate downlink control channel set comprises at least one candidate downlink control channel.

15. The method according to claim 10 or 11, wherein the repeatedly transmitted downlink control channels have the same aggregation level and/or the same search space within the M candidate downlink control channel sets.

16. The method of claim 12, wherein before the network device transmits downlink control channels within the set of M candidate downlink control channels, the method further comprises:

the network equipment sends configuration information to the terminal equipment, wherein the configuration information comprises at least one of the following information:

17. A terminal device, comprising:

a transceiver for receiving M sets of candidate downlink control channels, M > 1 and M being an integer;

a processor, configured to use the M candidate control channel sets as M repeatedly-sent candidate downlink control channel sets, and detect a first downlink control channel;

the transceiver is also used for receiving N candidate downlink control channel sets, wherein N is not less than 1 and is an integer;

the processor is further configured to, when the first downlink control channel is not detected, use L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets as P repeatedly-transmitted candidate downlink control channel sets, and detect a second downlink control channel, where M is greater than L, P is L + N, and L is an integer.

18. The terminal device of claim 17, wherein the processor is specifically configured to:

when the first downlink control channel is detected, the terminal sets the N candidate control channel sets as N repeatedly-sent candidate downlink control channel sets, and detects a second downlink control channel; wherein N > 1 or N ═ M.

19. The terminal device of claim 17, wherein P is M, and wherein the L sets of candidate downlink control channels are M-L to M sets of candidate downlink control channels in the M sets of candidate control channels.

20. The terminal device of claim 17, wherein each of the M candidate sets of downlink control channels and the N candidate sets of downlink control channels is located in a corresponding set of control resources, and wherein,

21. The terminal device of claim 17, wherein M < Q or M ═ Q, Q is a number of repeated transmissions or a maximum number of repeated transmissions of the candidate downlink control channels transmitted by the network device, and Q is an integer.

22. The terminal device according to claim 17, wherein each of the candidate downlink control channel sets comprises at least one candidate downlink control channel.

23. The terminal device according to claim 17, wherein the repeatedly transmitted downlink control channels have the same aggregation level and/or the same search space within the M candidate downlink control channel sets.

24. The terminal device of claim 17, wherein the transceiver is further configured to:

receiving configuration information from a network device, the configuration information including at least one of:

25. The terminal device according to claim 17, wherein when detecting the candidate downlink control channels, the terminal device processor combines the repeatedly transmitted candidate control channel sets in one detection process for the downlink control channels repeatedly transmitted by the network device, and the number of times is a preset value and/or a network configuration.

26. A network device, comprising:

a transceiver for transmitting a first downlink control channel in M candidate downlink control channel sets, the M candidate downlink control channel sets being M repeatedly transmitted candidate downlink control channel sets, M > 1 and M being an integer;

the transceiver is further configured to use L candidate downlink control channel sets and N candidate downlink control channel sets in the M candidate downlink control channel sets as P candidate downlink control channel sets that are repeatedly transmitted, where the network device transmits a second downlink control channel in the P candidate downlink control channel sets, where M is greater than L, P is L + N, L is an integer, N is greater than or equal to 1, and N is an integer, so that when the terminal device does not detect the first downlink control channel, the L candidate downlink control channel sets and the N candidate downlink control channel sets in the M candidate downlink control channel sets are used as P candidate downlink control channel sets that are repeatedly transmitted, and the second downlink control channel is detected.

27. The network device of claim 26, wherein the L sets of candidate downlink control channels are (M-L) th to M-th sets of candidate downlink control channels from the M sets of candidate downlink control channels.

28. The network device of claim 26 or 27, wherein each of the M sets of candidate downlink control channels and the N sets of candidate downlink control channels is located in a corresponding set of control resources, wherein,

29. The network device according to claim 26 or 27, wherein M < Q or M ═ Q, Q is a number of repeated transmissions or a maximum number of repeated transmissions of the candidate downlink control channels by the network device, and Q is an integer.

30. The network device of claim 26 or 27, wherein each candidate downlink control channel set comprises at least one candidate downlink control channel.

31. The network device according to claim 26 or 27, wherein the repeatedly transmitted downlink control channels have the same aggregation level and/or the same search space within the M candidate downlink control channel sets.

32. The network device of claim 26 or 27, wherein the transceiver is further configured to:

sending configuration information to a terminal device, wherein the configuration information comprises at least one of the following information: