CN111819898B

CN111819898B - Method and apparatus for channel transmission

Info

Publication number: CN111819898B
Application number: CN201980017885.7A
Authority: CN
Inventors: 贺传峰; 吴作敏; 石聪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-02-03
Filing date: 2019-02-03
Publication date: 2021-10-22
Anticipated expiration: 2039-02-03
Also published as: WO2020155182A1; CN111819898A

Abstract

The application discloses a channel transmission method, which can still ensure effective transmission of a channel and a signal under the condition that resource conflict occurs between a search space and the signal or other search spaces. The method comprises the following steps: acquiring a preset first search space which can be used for transmitting a first downlink control channel; acquiring a second search space which can be actually used for transmitting a first downlink control channel, wherein the second search space is positioned behind the first search space; and determining resources which can be used for transmitting the first downlink control channel in the second search space according to the distribution of target resources which can be used for transmitting a second control channel or a specific signal in the first search space and/or the distribution of the target resources in the second search space, wherein the target resources which can be used for transmitting the second control channel belong to a third search space.

Description

Method and apparatus for channel transmission

Technical Field

The embodiments of the present application relate to the field of communications, and more particularly, to a method and apparatus for channel transmission.

Background

In a 5G system or a New Radio (NR) system, data transmission on an unlicensed band (unlicensed spectrum) is supported. When a communication device performs NR communication (NR-based access to unlicensed spectrum, NR-U), it needs to be based on the principle of Listen Before Talk (LBT). That is, before signal transmission is performed on the unlicensed frequency band, channel interception needs to be performed first, and signal transmission can be performed only when an interception result is that a channel is idle; if the result of channel sensing on the unlicensed frequency band is channel occupation, signal transmission cannot be performed.

Due to uncertainty of obtaining the Channel usage right in the unlicensed frequency band, a PDCCH may not be sent in a position where a Physical Downlink Control Channel (PDCCH) should be transmitted, and the PDCCH is transmitted in other time domain positions. This may cause resource collision between the PDCCH and a Channel State Information-Reference Signal (CSI-RS), which affects transmission performance of the Channel and the Signal.

Disclosure of Invention

The embodiment of the application provides a channel transmission method and device, which can still ensure effective transmission of a channel and a signal under the condition that resource conflict occurs between a search space and the signal or between the search space and other search spaces.

In a first aspect, a method for channel transmission is provided, including: acquiring a preset first search space which can be used for transmitting a first control channel; acquiring a second search space which can be actually used for transmitting a first control channel, wherein the second search space is positioned behind the first search space; and determining resources which can be used for transmitting the first downlink control channel in the second search space according to the distribution of target resources which can be used for transmitting a second control channel or a specific signal in the first search space and/or the distribution of the target resources in the second search space, wherein the target resources which can be used for transmitting the second control channel belong to a third search space.

In a second aspect, a communication device is provided, which may perform the method of the first aspect or any optional implementation manner of the first aspect. In particular, the terminal device may comprise functional modules for performing the method of the first aspect or any possible implementation manner of the first aspect.

In a third aspect, a communication device is provided that includes a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the method of the first aspect or any possible implementation manner of the first aspect.

In a fourth aspect, a chip is provided for implementing the method of the first aspect or any possible implementation manner of the first aspect. In particular, the chip comprises a processor for calling and running a computer program from a memory, such that a device in which the chip is installed performs the method as described above in the first aspect or any possible implementation manner of the first aspect.

In a fifth aspect, a computer-readable storage medium is provided for storing a computer program, which causes a computer to perform the method of the first aspect or any possible implementation manner of the first aspect.

A sixth aspect provides a computer program product comprising computer program instructions to cause a computer to perform the method of the first aspect or any possible implementation form of the first aspect.

In a seventh aspect, a computer program is provided, which, when run on a computer, causes the computer to perform the method of the first aspect or any possible implementation manner of the first aspect.

In an eighth aspect, a communication system is provided, comprising a communication device, wherein the communication device is configured to: acquiring a preset first search space which can be used for transmitting a first control channel; acquiring a second search space which can be actually used for transmitting a first control channel, wherein the second search space is positioned behind the first search space; and determining resources which can be used for transmitting the first downlink control channel in the second search space according to the distribution of target resources which can be used for transmitting a second control channel or a specific signal in the first search space and/or the distribution of the target resources in the second search space, wherein the target resources which can be used for transmitting the second control channel belong to a third search space.

Based on the above technical solution, in an unlicensed frequency band, when a time domain position between a preset first search space capable of being used for transmitting a first control channel and a second search space actually capable of being used for transmitting the first control channel is different, a network device and a terminal device transmit and receive a signal according to a resource occupation condition of another channel or signal in the first search space and/or a resource occupation condition of another channel or signal in the second search space, so that effective transmission of the channel and the signal is still ensured under a condition that a resource conflict occurs between the search space and the signal or between the search space and the other search space.

Drawings

Fig. 1 is a schematic diagram of a possible wireless communication system to which an embodiment of the present application is applied.

Fig. 2 is a schematic diagram of a search space in the LTB case.

Fig. 3 is a schematic diagram of a CSI-RS pattern.

Fig. 4 is a diagram illustrating that no resource overlap occurs between CSI-RS and a control channel.

Fig. 5 is a diagram of CSI-RS and control channel resource overlap.

Fig. 6 is a schematic flow chart of a channel transmission method according to an embodiment of the present application.

Fig. 7(a), fig. 7(b) and fig. 7(c) are schematic transmission diagrams when resource overlapping occurs between CSI-RS and control channel according to an embodiment of the present application.

Fig. 8(a), 8(b) and 8(c) are transmission diagrams when resource overlapping occurs between CSI-RS and control channel according to the embodiment of the present application.

Fig. 9(a), 9(b), 9(c), 9(d) and 9(e) are transmission diagrams when resource overlapping occurs between CSI-RS and control channel according to the embodiment of the present application.

Fig. 10 is a schematic block diagram of a communication device of an embodiment of the present application.

Fig. 11 is a schematic configuration diagram of a communication apparatus according to an embodiment of the present application.

Fig. 12 is a schematic structural diagram of a chip of an embodiment of the present application.

Fig. 13 is a schematic block diagram of a communication system of an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application are described below with reference to the drawings of the embodiments of the present application.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, a LTE Frequency Division Duplex (FDD) System, a LTE Time Division Duplex (TDD) System, a Long Term Evolution (Advanced) Evolution (LTE-A) System, a New Radio (New Radio, NR) System, an Evolution System of an NR System, a non-licensed-channel-Access (LTE-N) System, a non-licensed-U-NR System, a non-licensed-Universal-NR (NR) System, UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, Wireless Local Area Network (WLAN), Wireless Fidelity (WiFi), next generation communication system, or other communication system.

Generally, conventional Communication systems support a limited number of connections and are easy to implement, however, with the development of Communication technology, mobile Communication systems will support not only conventional Communication, but also, for example, Device-to-Device (D2D) Communication, Machine-to-Machine (M2M) Communication, Machine Type Communication (MTC), and Vehicle-to-Vehicle (V2V) Communication, and the embodiments of the present application can also be applied to these Communication systems.

Optionally, the communication system in the embodiment of the present application may be applied to Carrier Aggregation (CA), Dual Connectivity (DC), independent (SA) networking, and other scenarios.

Illustratively, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The wireless communication system 100 may include a network device 110. Network device 110 may be a device that communicates with a terminal device. Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within that coverage area. Optionally, the Network device 100 may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, a Network side device in an NR system, or a wireless controller in a Cloud Radio Access Network (CRAN), or a Network device in a relay Station, an Access point, a vehicle-mounted device, a wearable device, a Network side device in a next generation Network, or a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.

The wireless communication system 100 also includes at least one terminal device 120 located within the coverage area of the network device 110. The terminal device 120 may be mobile or stationary. Alternatively, terminal Equipment 120 may refer to an access terminal, User Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, User terminal, wireless communication device, User agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, 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 PLMN, etc. Optionally, a Device to Device (D2D) communication may be performed between the terminal devices 120.

The network device 110 may provide a service for a cell, and the terminal device 120 communicates with the network device 110 through a transmission resource (e.g., a frequency domain resource or a spectrum resource) used by the cell, where the cell may be a cell corresponding to the network device 110 (e.g., a base station), and the cell may belong to a macro base station or a base station corresponding to a Small cell (Small cell), where the Small cell may include, for example, a Metro cell (Metro cell), a Micro cell (Micro cell), a Pico cell (Pico cell), a Femto cell (Femto cell), and the like, and the Small cells have characteristics of Small coverage and low transmission power, and are suitable for providing a high-rate data transmission service.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the wireless communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application. The wireless communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

In NR systems, data transmission on unlicensed bands (otherwise known as unlicensed spectrum) is supported. Unlicensed spectrum is a nationally and regionally divided spectrum that may be used for communication by radio devices, and is generally considered a shared spectrum, i.e., a spectrum that may be used by communication devices in different communication systems as long as the regulatory requirements set by the country or region on the spectrum are met, without requiring a proprietary spectrum license to be applied to the government. In order for various communication systems using unlicensed spectrum for wireless communication to coexist friendly on the spectrum, some countries or regions stipulate regulatory requirements that must be met using unlicensed spectrum. For example, in europe and other regions, a communication device follows a principle of "listen before talk", that is, the communication device needs to perform channel sensing before performing signal transmission on a channel of an unlicensed spectrum, and can perform signal transmission only when a result of the channel sensing is that the channel is idle; if the communication device performs channel sensing on the unlicensed spectrum and the result is that the channel is busy, the communication device cannot perform signal transmission.

Data transmission over unlicensed spectrum has uncertainty over data transmission over licensed spectrum.

In the NR system, there are mainly two types of resource allocation of a Physical Downlink Shared Channel (PDSCH) in the time domain: type a and Type B. As shown in table one, for a Normal Cyclic Prefix (Normal CP), a starting symbol S of a PDSCH adopting Type a may be {0, 1, 2, 3}, and a length L of the PDSCH may be a number of symbols {3, 4, ·. The starting symbol S of the PDSCH with Type B may be {0, 1...., 12}, and the length L of the PDSCH may be the number of symbols {2, 4, 7 }. The scheduling method of the PDSCH adopting Type a may be understood as a slot-based scheduling method, because only one PDSCH can be transmitted in one slot. The scheduling of PDSCH with Type B may be understood as a mini-slot (mini-slot) based scheduling, since multiple PDSCHs may be transmitted in one slot.

Watch 1

When the network device schedules downlink data transmission of the terminal device, a Time Domain Resource Allocation (TDRA) field is carried in Downlink Control Information (DCI), where the TDRA field is 4 bits (bit), and may indicate 16 different rows in a Resource Allocation table, where each row corresponds to a Resource Allocation group, and each Resource Allocation group may include, for example, a length L of a starting position S, PDSCH of a PDSCH, and a mapping Type (mapping Type) used, that is, Information of the Type a and the Type B. The resource allocation table is also different for different purposes of downlink data transmission.

The terminal device can obtain information of a PDSCH configured by Radio Resource Control (RRC) signaling according to an indication of a TDRA field in DCI, where the information includes a time slot K0 between the PDSCH and a Physical Downlink Control Channel (PDCCH) for scheduling the PDSCH, a mapping type, and a starting position S and a length L of the PDSCH.

In the NR system, a transmission resource of a PDCCH is determined by a semi-statically configured PDCCH search space (PDCCH search space). The terminal device detects a PDCCH in a semi-statically configured PDCCH search space (hereinafter, referred to simply as a search space), thereby obtaining resource allocation information of the PDSCH. In NR-U, uncertainty of the downlink transmission channel may be caused due to the LBT mechanism. Thus, the PDCCH and the PDSCH may not be transmitted at a position where the PDCCH and the PDSCH should be originally transmitted.

For example, as shown in fig. 2, in case 1, before the semi-statically configured search space arrives, the network device obtains the channel usage weight through LBT, and then sends PDCCH according to the pre-configured search space, assuming that the pre-configured search space occupies two symbols. Wherein the search space within the slot n includes symbol 0 and symbol 1 in the slot n. The network device transmits PDCCH on symbol 0 and symbol 1 and PDSCH on symbol 2 to symbol 13.

In case 2, the network device does not obtain the channel usage weight before symbol 0, but obtains the channel usage weight on symbol 3 through LBT. Then the network device defers the PDCCH to transmission on

symbols

3 and 4, i.e. the PDCCH search space is shifted from

symbols

0 and 1 to

symbols

3 and 4.

In case 3, the network device does not obtain the channel usage weight before symbol 0, but obtains the channel usage weight on symbol 7 through LBT. Then the network device defers the PDCCH to transmission on symbol 7 and symbol 8, i.e. the PDCCH search space is shifted from symbol 0 and symbol 1 to symbol 7 and symbol 8.

The CSI-RS is used for measurement of Channel state information such as a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and the like. In the NR system, the CSI-RS supports a maximum of 32 antenna ports. And the CSI-RS on different antenna ports are multiplexed and form a CSI-RS pattern (CSI-RS pattern) in a frequency division, time division or code division mode. For example, as shown in fig. 3, for CSI-RSs of 12 antenna ports, there may be two CSI-RS patterns, where CSI-RS pattern 1 is a group including 6 Code Division Multiplexing (CDM) 2, each group of CDM2 includes 2 Resource Elements (REs), and CSI-RSs of two antenna ports are Code Division multiplexed. The CSI-RS pattern 2 is a group comprising 3 CDM4, each group of CDM4 comprises 4 REs, and CSI-RSs of 4 antenna ports are subjected to code division multiplexing.

The CSI-RS resource is configured for the terminal equipment by the network equipment, and in consideration of the overhead problem of the CSI-RS resource, the network equipment often configures a set of CSI-RS resource for a plurality of terminal equipment to share when configuring the CSI-RS resource. And the terminal equipment performs rate matching on the RE in the configured CSI-RS resource. For example, if REs of the PDSCH resources include REs of the CSI-RS resources configured by the network, puncturing is performed on these REs, i.e., PDSCH is not carried on these REs.

For the PDCCH, when the network equipment configures a PDCCH search space and CSI-RS resources, the condition of RE overlapping between the PDCCH and the CSI-RS is considered, and corresponding rate matching is carried out. These configurations are semi-static, and the network device may determine the rate matching method to be used in advance when performing channel coding and resource mapping.

However, in NR-U, due to LBT, the position of PDCCH resources may vary according to the result of LBT, causing the previously determined rate matching manner to change. For the network device, a new rate matching method needs to be determined, for example, when REs between PDCCH and CSI-RS overlap, which channel or signal is punctured needs to be determined. For the terminal device, it is necessary to receive a channel or a signal according to a new rate matching method. As shown in fig. 4, the semi-statically configured search space and CSI-RS resource positions of the network device are not overlapped with the PDCCH search space and the CSI-RS resource, and do not need to perform corresponding rate matching, but are overlapped with the PDSCH resource and the CSI-RS resource, and need to perform rate matching.

However, as shown in fig. 5, due to the result of LBT, the PDCCH search space is deferred by the network device to symbol 1 and symbol 2, which are semi-statically configured, until symbol 7 and symbol 8, and there are semi-statically configured CSI-RS resources on symbol 7 and symbol 8. Thus, the PDCCH search spaces and CSI-RS resources, which would not otherwise overlap, may overlap due to LBT in the NR-U system. As shown in fig. 5, the delay is delayed until the REs of a certain Physical Resource Block (PRB) in the Control Resource Set (CORESET) in the PDCCH search space on symbol 7 and symbol 8 overlap with the CSI-RS Resource. Thereby affecting the transmission of the channel and signal.

The embodiment of the application provides a channel transmission method, which can still ensure effective transmission of a channel and a signal under the condition that resource conflict occurs between a search space and the signal or between the search space and other search spaces.

Fig. 6 is a schematic flow chart of a method of channel transmission according to an embodiment of the present application. The method shown in fig. 6 may be performed by a terminal device, such as terminal device 120 shown in fig. 1, or a network device, such as network device 110 shown in fig. 1. The method can be applied to the unlicensed frequency band. As shown in fig. 6, the method includes:

at 610, a preset first search space that can be used for transmitting a first control channel is obtained.

In 620, a second search space that can actually be used for transmitting the first control channel is obtained.

The first search space and the second search space may be, for example, a dedicated search space, a common search space, or a group common search space of the terminal device.

Optionally, the second search space is located after the first search space.

The second search space is, for example, a search space obtained after the first search space is translated.

For example, due to LBT or the like, the first search space, which should be located on a symbol preset in the slot, is postponed to the symbol for which channel usage rights are obtained.

Referring to fig. 2, in case 1, the first search space is located at symbol 0 and symbol 1. But due to LBT, in case 2 the first search space is postponed to symbol 3 and symbol 4, then the first search space is located at symbol 0 and symbol 1 and the second search space is located at symbol 3 and symbol 4. In case 3, the first search space is postponed to symbol 7 and symbol 8, then the first search space is located at symbol 0 and symbol 1 and the second search space is located at symbol 7 and symbol 8. Thus, the second search space may occupy the same frequency domain resources as the first search space, but shifted in the time domain.

In 630, the resources in the second search space that can be used for transmitting the first downlink control channel are determined according to the distribution of the target resources in the first search space that can be used for transmitting the second control channel or the specific signal and/or the distribution of the target resources in the second search space.

Specifically, the network device and the terminal device may determine the resource allocation in the second search space according to the distribution of the target resource in the first search space and/or the distribution of the target resource in the second search space. For example, determining resources within the second search space that can be used for transmitting the first downlink control channel and/or resources within the second search space that can be used for transmitting the second downlink control channel or a specific signal.

Wherein a target resource available for transmission of the second control channel belongs to a third search space. The third search space can be used for transmitting the second control channel and the first search space can be used for transmitting the first control channel.

The third search space may be, for example, at least one of the following types: a dedicated search space, a common search space, a group common PDCCH search space (group common) of the terminal device.

The specific signal may be, for example, at least one of the following types: channel State indication Reference Signal (CSI-RS), synchronization Signal Block (Synchronizing Signal/PBCH Block, SSB or SS/PBCH Block), Positioning Reference Signal (PRS), Tracking Reference Signal (TRS), demodulation Reference Signal (DMRS), Phase Tracking Reference Signal (PTRS), and the like.

There may be overlapping resources between the target resource that can be used to transmit the second control channel or the particular signal and the first search space. There may also be overlapping resources between the target resource and the second search space. At this point, consideration needs to be given to how to guarantee efficient transmission of channels and/or signals within the second search space.

In an unlicensed frequency band, when a preset first search space which can be used for transmitting a first control channel is different from a time domain position which can be used for actually transmitting the first control channel, a network device and a terminal device transmit and receive signals according to resource occupation conditions of other channels or signals in the first search space and/or resource occupation conditions of other channels or signals in a second search space, so that effective transmission of the channels and the signals is still ensured under the condition that resource conflicts occur between the search space and the signals or between the search space and the other search spaces.

For a specific signal, the target resource is a signal resource used for transmitting the specific signal; for the second control channel, the target resource is a search space corresponding to the second control channel, i.e., a third search space. The method described in the embodiments of the present application can be used for the overlapping between the signal and the search space, and can also be used for the overlapping between different search spaces.

The "preset" described in the embodiments of the present application may be configured by the network device, or may be preconfigured, for example, as agreed in the protocol. For example, the preset first search space capable of being used for transmitting the first control channel may be a semi-statically configured first search space of the network device.

In addition, the "available for transmission" indicates a capability with which transmission may or may not be performed. For example, the second search space can be used for transmitting the first control channel, indicating that the resources in the second search space are candidate resources for the first control channel, and the first control channel can be transmitted on at least a portion of the resources in the second search space rather than the entire resources. For another example, the overlapping resource between the target resource and the second search space can be used for transmitting the first control channel, which means that the overlapping resource can be a candidate resource for the first control channel, but the first control channel may or may not be transmitted on the overlapping resource.

The embodiments of the present application are described in conjunction with the following three cases. That is, the target resource overlaps the first search space, the target resource overlaps the second search space, and the target resource overlaps the first search space and overlaps the second search space.

Case 1

The target resource overlaps the first search space.

The target resource is assumed to overlap the first search space on a first time-frequency resource.

Optionally, a third time-frequency resource corresponding to the first time-frequency resource in the second search space can be used for transmitting the first control channel.

Or, optionally, the first control channel is not transmitted on a third time-frequency resource corresponding to the first time-frequency resource in the second search space. That is, the third time-frequency resource in the second search space is punctured.

The third time frequency resource in the second search space is associated with the first time frequency resource in the first search space, and the association relationship between the third time frequency resource and the first time frequency resource is not limited in the embodiment of the application.

For example, the frequency domain position of the third time frequency resource is the same as that of the first time frequency resource; the time interval between the third time domain resource and the first time domain resource is equal to the time interval between the first search space and the second search space.

For another example, the frequency domain positions of the third time frequency resource and the first time frequency resource are the same; the third time domain resource is the same as the time domain resource of the second search space.

For another example, a preset distance is formed between the third time-frequency resource and the frequency domain position of the first time-frequency resource; the time interval between the third time domain resource and the first time domain resource is equal to the time interval between the first search space and the second search space.

The case will be described with reference to fig. 7(a) to 7(c), and the specific signal is assumed to be CSI-RS, taking case 3 in fig. 2 as an example. The first search space is located on symbol 0 and symbol 1, the network device does not obtain the channel usage weights on symbol 0 to symbol 6, but obtains the channel usage weights on symbol 7, i.e. LBT succeeds, and then the second search space is located on symbol 7 and symbol 8. Since the CSI-RS transmission is configured on the first time-frequency resource in the first search space, that is, the first time-frequency resource is reserved in the first search space for transmitting the CSI-RS, it needs to consider whether the third time-frequency resource corresponding to the first time-frequency resource in the second search space is empty or used for transmitting the PDCCH.

For example, as shown in fig. 7(b), when the target resource overlaps the first search space on the first time-frequency resource, the third time-frequency resource location in the second search space may be punctured and thus not used for transmitting PDCCH.

Therefore, the available resources of the PDCCH are ensured to be unchanged, the coding and the rate matching of the PDCCH do not need to be dynamically changed, and the processing complexity of network equipment is reduced.

For example, as shown in fig. 7(c), when the target resource and the first search space overlap on the first time-frequency resource, the third time-frequency resource location in the second search space can be used for transmitting PDCCH.

Thus, resources available for transmitting the PDCCH are increased, and the transmission performance of the PDCCH is improved. But to some extent increases the encoding and receiving complexity of the terminal device.

In this embodiment, the resources that can be used for transmitting the PDCCH in the second search space are affected by not only the resource occupancy in the second search space, but also the resource occupancy in the first search space.

Case 2

The target resource overlaps the second search space.

The target resource overlaps the second search space on a second time-frequency resource.

Optionally, the second time-frequency resource in the second search space can be used for transmitting the second control channel or the specific signal.

Or, optionally, the second time-frequency resource in the second search space can be used for transmitting the first control channel.

For example, as shown in fig. 8(a), the specific signal is assumed to be CSI-RS, taking the case 3 in fig. 2 as an example. The first search space is located on symbol 0 and symbol 1, the network device does not obtain the channel usage weights on symbol 0 to symbol 6, but obtains the channel usage weights on symbol 7, i.e. LBT succeeds, and then the second search space is located on symbol 7 and symbol 8. Since CSI-RS transmission is configured on the second time-frequency resource in the second search space, it is necessary to consider whether to transmit CSI-RS on the second time-frequency resource in the second search space, or to use the second time-frequency resource in the second search space as a candidate resource for PDCCH transmission.

For example, as shown in fig. 8(b), when the target resource and the second search space overlap on a second time-frequency resource, the second time-frequency resource location in the second search space is used for transmitting CSI-RS.

Therefore, the performance of the CSI-RS as the reference signal is ensured, the CSI-RS as the reference signal shared by a plurality of terminal devices in the cell is ensured, the measurement accuracy of the CSI-RS as the measurement signal is ensured, and the system throughput is improved.

For example, as shown in fig. 8(c), when the target resource and the second search space overlap on a second time-frequency resource, the second time-frequency resource location in the second search space can be used for transmitting PDCCH.

In this way, the number of available resources of the PDCCH and the detection performance are ensured by puncturing the resource positions of the CSI-RS. Meanwhile, because the number of REs included in the PDCCH search space is not changed, the coding and rate matching of the PDCCH do not need to be dynamically changed, and the processing complexity of the network equipment is reduced.

Case 3

The target resource overlaps the first search space and the target resource overlaps the second search space.

The target resource is assumed to overlap the first search space on a first time-frequency resource, and the target resource overlaps the second search space on a second time-frequency resource.

Optionally, a third time-frequency resource corresponding to the first time-frequency resource in the second search space can be used for transmitting the first control channel; and the second time-frequency resource in the second search space can be used for transmitting the second control channel or the specific signal.

Or, optionally, the first control channel is not transmitted on a third time-frequency resource corresponding to the first time-frequency resource in the second search space, that is, the third time-frequency resource is punctured; and the second time-frequency resource in the second search space can be used for transmitting the second control channel or the specific signal.

Or, optionally, a third time-frequency resource corresponding to the first time-frequency resource in the second search space can be used for transmitting the first control channel; and the second time-frequency resource in the second search space can be used for transmitting the first control channel.

Or, optionally, the first control channel is not transmitted on a third time-frequency resource corresponding to the first time-frequency resource in the second search space, that is, the third time-frequency resource is punctured; and the second time-frequency resource in the second search space can be used for transmitting the first control channel.

For example, as shown in fig. 9(a), the specific signal is assumed to be CSI-RS, taking the case 3 in fig. 2 as an example. The first search space is located on symbol 0 and symbol 1, the network device does not obtain the channel usage weights on symbol 0 to symbol 6, but obtains the channel usage weights on symbol 7, i.e. LBT succeeds, and then the second search space is located on symbol 7 and symbol 8.

Since the CSI-RS transmission is configured on the first time-frequency resource in the first search space, that is, the first time-frequency resource is reserved in the first search space for transmitting the CSI-RS, it needs to be considered whether the third time-frequency resource in the second search space is free or used for transmitting the PDCCH. Moreover, since CSI-RS transmission is configured on the second time-frequency resource in the second search space, it is also necessary to consider whether CSI-RS is transmitted on the second frequency-domain resource in the second search space, or the second frequency-domain resource in the second search space is used as a candidate resource for PDCCH transmission.

For example, as shown in fig. 9(b), when the target resource overlaps the first search space on a first time-frequency resource and the target resource overlaps the second search space on a second time-frequency resource, the third time-frequency resource in the second search space may be punctured. Meanwhile, the second time-frequency resource in the second search space is used for transmitting CSI-RS.

For example, as shown in fig. 9(c), when the target resource overlaps the first search space on a first time-frequency resource and the target resource overlaps the second search space on a second time-frequency resource, the third time-frequency resource in the second search space may be punctured. Meanwhile, the second time-frequency resource in the second search space can be used for transmitting the PDCCH.

For example, as shown in fig. 9(d), when the target resource overlaps with the first search space on a first time-frequency resource and the target resource overlaps with the second search space on a second time-frequency resource, the third time-frequency resource location in the second search space can be used for transmitting PDCCH. Meanwhile, the second time-frequency resource location in the second search space is used for transmitting CSI-RS.

For example, as shown in fig. 9(e), when the target resource overlaps with the first search space on a first time-frequency resource and the target resource overlaps with the second search space on a second time-frequency resource, the third time-frequency resource location in the second search space can be used for transmitting PDCCH. Meanwhile, the second time-frequency resource location in the second search space can be used for transmitting the PDCCH.

In the above three cases, if the target resource overlaps the first search space on the first time-frequency resource, the first control channel can be transmitted on frequency-domain resources other than the third time-frequency resource in the second search space. If the target resource overlaps with the second search space on a second time frequency resource, the first control channel can be transmitted on frequency domain resources other than the second time frequency resource in the second search space. If the target resource overlaps with the first search space on a first time-frequency resource and the target resource overlaps with the second search space on a second time-frequency resource, the first control channel can be transmitted on frequency-domain resources other than the third time-frequency resource and the second time-frequency resource in the second search space.

That is, resources within the second search space that do not overlap with other channel resources or signal resources remain candidate resources for the first control channel transmission.

The "transmission" described in the embodiments of the present application may include transmission or reception.

For example, for a network device, the network device may determine resources in the second search space that can be used for transmitting the first downlink control channel according to the distribution of the target resource in the first search space and/or the distribution of the target resource in the second search space, and perform channel and/or signal transmission in the second search space.

For another example, for a terminal device, the terminal device may determine resources in the second search space that can be used for receiving the first downlink control channel according to the distribution of the target resource in the first search space and/or the distribution of the target resource in the second search space, and perform channel and/or signal reception in the second search space.

Optionally, in 630, the network device and the terminal device may not only perform transmission of channels and/or signals according to the distribution of the target resource in the first search space and/or the distribution of the target resource in the second search space, but also consider other factors, such as the type of the specific signal or the third search space, the size information of the first time-frequency resource, the size information of the second time-frequency resource, and so on.

That is, in 630, the transmission of the channel and/or signal may be performed according to at least one of the following information by the network device and the terminal device:

the distribution of the target resource in the first search space;

the distribution of the target resource in the second search space;

a type of the particular signal or the third search space;

size information of the first time-frequency resource and/or size information of the second time-frequency resource.

The size information of the first time-frequency resource, that is, the information of the size of the overlapping resource between the target resource and the first search space, may be, for example, the size of the overlapping resource, a proportion of the overlapping resource in the first search space, or a proportion of the overlapping resource in the target resource.

The size information of the second time-frequency resource, that is, the information of the size of the overlapping resource between the target resource and the second search space, may be, for example, the size of the overlapping resource, the proportion of the overlapping resource in the second search space, or the proportion of the overlapping resource in the target resource.

For example, when the target resource and the second search space overlap on the second time-frequency resource, the resource in the second search space that can be used for transmitting the PDCCH may be determined according to the type of the specific signal. When the specific signal or channel is a dedicated signal or channel of the terminal device, for example, a dedicated search space, DMRS, PRS, or PTRS of the terminal device, the second time-frequency resource can be used for transmitting the PDCCH, but not for transmitting the specific signal or channel. The second time-frequency resource is not used for transmitting the PDCCH when the specific signal or channel is a cell-specific signal or channel, for example, a common search space, a group common search space, a CSI-RS, an SSB, or a TRS.

For another example, when the target resource and the second search space are overlapped on the second time-frequency resource, the resource that can be used for transmitting the PDCCH in the second search space may be determined according to the size of the second time-frequency resource. When the specific signal or channel is a cell-specific signal or channel, for example, a common search space, a group common search space, a CSI-RS, an SSB, or a TRS, if the number of REs included in the second time-frequency resource is greater than a preset value, the second time-frequency resource is used for transmitting the specific signal or channel, and if the number of REs included in the second time-frequency resource is less than the preset value, the second time-frequency resource can be used for transmitting a PDCCH.

It should be noted that, without conflict, the embodiments and/or technical features in the embodiments described in the present application may be arbitrarily combined with each other, and the technical solutions obtained after the combination also fall within the protection scope of the present application.

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

Having described the communication method according to the embodiment of the present application in detail above, an apparatus according to the embodiment of the present application will be described below with reference to fig. 10 to 13, and the technical features described in the method embodiment are applicable to the following apparatus embodiments.

Fig. 10 is a schematic block diagram of a communication device 1000 according to an embodiment of the present application. As shown in fig. 8, the network device 1000 includes a processing unit 1010. The processing unit 1010 is configured to:

acquiring a preset first search space which can be used for transmitting a first control channel;

acquiring a second search space which can be actually used for transmitting a first control channel, wherein the second search space is positioned behind the first search space;

and determining resources which can be used for transmitting the first downlink control channel in the second search space according to the distribution of target resources which can be used for transmitting a second control channel or a specific signal in the first search space and/or the distribution of the target resources in the second search space, wherein the target resources which can be used for transmitting the second control channel belong to a third search space.

Therefore, in the unlicensed frequency band, when the time domain position between the preset first search space capable of being used for transmitting the first control channel and the second search space actually capable of being used for transmitting the first control channel is different, the network device and the terminal device transmit and receive signals according to the resource occupation condition of other channels or signals in the first search space and/or the resource occupation condition of other channels or signals in the second search space, so that under the condition that resource conflict occurs between the search space and the signals or with other search spaces, effective transmission of the channels and the signals is still ensured.

Optionally, when the target resource overlaps with the first search space on a first time-frequency resource, a third time-frequency resource corresponding to the first time-frequency resource in the second search space may be used for transmitting the first control channel, or the third time-frequency resource in the second search space does not transmit the first control channel.

Optionally, the frequency domain position of the third time frequency resource is the same as that of the first time frequency resource. A time interval between the third time domain resource and the first time domain resource is equal to a time interval between the first search space and the second search space.

Optionally, when the target resource and the second search space overlap on a second time-frequency resource. The second time-frequency resource in the second search space may be used for transmitting the second control channel or the specific signal, or the second time-frequency resource in the second search space may be used for transmitting the first control channel.

Optionally, the first control channel may be transmitted on frequency domain resources in the second search space except for the third time-frequency resource and the second time-frequency resource.

Optionally, the specific signal is at least one of the following signal types: channel state information reference signal CSI-RS, synchronization signal block SSB, tracking reference signal TRS and positioning reference signal PRS, demodulation reference signal DMRS.

Optionally, the third search space is at least one of the following types: a dedicated search space, a common search space, a group common search space of the terminal device.

Optionally, the processing unit 1010 is specifically configured to: determining resources within the second search space available for transmission of the first downlink control channel based on at least one of: the distribution condition of the target resource in the first search space, the distribution condition of the target resource in the second search space, the type of the specific signal or the third search space, the size information of the first time-frequency resource, and the size information of the second time-frequency resource.

It should be understood that the network device 1000 may perform corresponding operations performed by the terminal device or the network device in the method 600, and therefore, for brevity, detailed description is omitted here.

Fig. 11 is a schematic structural diagram of a communication device 1100 according to an embodiment of the present application. The communication device 1100 shown in fig. 11 includes a processor 1110, and the processor 1110 can call and execute a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 11, the communication device 1100 may further include a memory 1120. From the memory 1120, the processor 1110 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 1120 may be a separate device from the processor 1110, or may be integrated into the processor 1110.

Optionally, as shown in fig. 11, the communication device 1100 may further include a transceiver 1130, and the processor 1110 may control the transceiver 1130 to communicate with other devices, and in particular, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 1130 may include a transmitter and a receiver, among others. The transceiver 1130 may further include one or more antennas, which may be present in number.

Optionally, the communication device 1100 may specifically be a terminal device in the embodiment of the present application, and the communication device 1100 may implement a corresponding process implemented by the terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the communication device 1100 may specifically be a network device in the embodiment of the present application, and the communication device 1100 may implement a corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Fig. 12 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 1200 shown in fig. 12 includes a processor 1210, and the processor 1210 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 12, the chip 1200 may further include a memory 1220. From the memory 1220, the processor 1210 may call and execute a computer program to implement the method in the embodiment of the present application.

The memory 1220 may be a separate device from the processor 1210, or may be integrated into the processor 1210.

Optionally, the chip 1200 may further include an input interface 1230. The processor 1210 may control the input interface 1230 to communicate with other devices or chips, and in particular, may obtain information or data transmitted by other devices or chips.

Optionally, the chip 1200 may further include an output interface 1240. The processor 1210 may control the output interface 1240 to communicate with other devices or chips, and in particular, may output information or data to the other devices or chips.

Optionally, the chip may be applied to the terminal device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

The chip described in the embodiments of the present application may also be referred to as a system-on-chip, or a system-on-chip.

The processor in the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

The memory in the embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DRRAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The above memory is an exemplary but not limiting illustration, for example, the memory in the embodiment of the present application may also be Static random access memory (Static RAM, SRAM), Dynamic random access memory (Dynamic RAM, DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), Enhanced Synchronous SDRAM (Enhanced SDRAM, ESDRAM), Synchronous Link DRAM (Synchronous Link DRAM, SLDRAM), Direct bus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

Fig. 13 is a schematic block diagram of a communication system 1300 according to an embodiment of the present application. As shown in fig. 13, the communication system 1300 includes a communication device 1310, and the communication device 1310 may be a network device or a terminal device.

The network device 1310 is configured to: acquiring a preset first search space which can be used for transmitting a first control channel; acquiring a second search space which can be actually used for transmitting a first control channel, wherein the second search space is positioned behind the first search space; and determining resources which can be used for transmitting the first downlink control channel in the second search space according to the distribution of target resources which can be used for transmitting a second control channel or a specific signal in the first search space and/or the distribution of the target resources in the second search space, wherein the target resources which can be used for transmitting the second control channel belong to a third search space.

Optionally, the communication device 1310 may be configured to implement corresponding functions implemented by a network device or a terminal device in the method 600, and the composition of the communication device 1310 may be as shown in the communication device 1000 in fig. 10, which is not described herein again for brevity.

The embodiment of the application also provides a computer readable storage medium for storing the computer program. Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables a computer to execute corresponding processes implemented by the network device in the methods in the embodiments of the present application, which are not described again for brevity. Optionally, the computer-readable storage medium may be applied to the terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the terminal device in each method in the embodiment of the present application, which is not described again for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions. Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity. Optionally, the computer program product may be applied to the terminal device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the terminal device in the methods in the embodiment of the present application, which are not described herein again for brevity.

The embodiment of the application also provides a computer program. Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again. Optionally, the computer program may be applied to the terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the terminal device in each method in the embodiment of the present application, and for brevity, details are not described here again.

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.

The terms "system" and "network" in embodiments of the present invention are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiment of the present invention, "B corresponding to (corresponding to) a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

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.

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 unit is only one logical functional 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 channel transmission, the method being applied to an unlicensed frequency band, the method comprising:

and determining resources which can be used for transmitting the first control channel in the second search space according to the distribution situation of target resources which can be used for transmitting a second control channel or a specific signal in the first search space and/or the distribution situation of the target resources in the second search space, wherein the target resources which can be used for transmitting the second control channel belong to a third search space.

2. The method of claim 1, wherein when the target resource and the first search space overlap on a first time-frequency resource,

a third time-frequency resource corresponding to the first time-frequency resource in the second search space may be used for transmitting the first control channel, or the first control channel is not transmitted on the third time-frequency resource in the second search space.

3. The method of claim 2,

the frequency domain position of the third time frequency resource is the same as that of the first time frequency resource;

and the time interval between the third time frequency resource and the first time frequency resource is equal to the time interval between the first search space and the second search space.

4. The method of claim 2, wherein when the target resource overlaps the second search space on a second time-frequency resource,

the second time-frequency resource in the second search space may be used for transmitting the second control channel or the specific signal, or the second time-frequency resource in the second search space may be used for transmitting the first control channel.

5. The method of claim 4, wherein the first control channel is capable of being transmitted on frequency domain resources within the second search space other than the third time-frequency resource and the second time-frequency resource.

6. The method of claim 1, wherein when the target resource overlaps the second search space on a second time-frequency resource,

7. The method according to any one of claims 1 to 6, wherein the specific signal is at least one of the following signal types:

channel state information reference signal CSI-RS, synchronization signal block SSB, tracking reference signal TRS and positioning reference signal PRS, demodulation reference signal DMRS.

8. The method of any of claims 1 to 6, wherein the third search space is at least one of the following types:

a dedicated search space, a common search space, a group common search space of the terminal device.

9. The method according to any one of claims 4 to 6, wherein the determining the resources available for transmitting the first control channel in the second search space according to the distribution of the target resources available for transmitting the second control channel or the specific signal in the first search space and/or the distribution of the target resources in the second search space comprises:

determining resources within the second search space available for transmission of the first control channel based on at least one of: the distribution condition of the target resource in the first search space, the distribution condition of the target resource in the second search space, the type of the specific signal or the third search space, the size information of the first time-frequency resource, and the size information of the second time-frequency resource.

10. A communication device, wherein the communication device is applied to an unlicensed frequency band, and wherein the communication device comprises:

the processing unit is used for acquiring a preset first search space which can be used for transmitting a first control channel;

the processing unit is further configured to obtain a second search space that can be actually used for transmitting the first control channel, where the second search space is located after the first search space;

the processing unit is further configured to determine resources in the second search space that can be used for transmitting the first control channel according to a distribution of target resources in the first search space that can be used for transmitting a second control channel or a specific signal and/or a distribution of the target resources in the second search space, where the target resources that can be used for transmitting the second control channel belong to a third search space.

11. The communications device of claim 10, wherein when the target resource overlaps the first search space on a first time-frequency resource,

12. The communication device of claim 11,

13. The communications device of claim 11, wherein when the target resource overlaps the second search space on a second time-frequency resource,

14. The communications device of claim 13, wherein the first control channel can be transmitted on frequency domain resources within the second search space other than the third time-frequency resource and the second time-frequency resource.

15. The communications device of claim 10, wherein when the target resource overlaps the second search space on a second time-frequency resource,

16. The communication device according to any of claims 10 to 15, wherein the specific signal is at least one of the following signal types:

17. The communication device of any of claims 10 to 15, wherein the third search space is at least one of the following types:

18. The communication device according to any of claims 13 to 15, wherein the processing unit is specifically configured to:

19. A communication device, characterized in that the communication device comprises a processor and a memory for storing a computer program, the processor being adapted to invoke and execute the computer program stored in the memory to perform the method of any of claims 1 to 9.

20. A chip, characterized in that it comprises a processor for calling up and running a computer program from a memory, so that a device in which the chip is installed performs the method of any one of claims 1 to 9.

21. A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 1 to 9.

22. A communication system, comprising: a communication device as claimed in any one of claims 10 to 18.