Method for communication in unlicensed spectrum and device

Abstract

Embodiments of the present application relate to a method for communication in an unlicensed spectrum and a device. The method comprises: a terminal device detects first information for indicating channel occupancy time (COT) information; and the terminal device detects, on the basis of the COT information, in the COT, second information for indicating data reception or transmission. The method for communication in an unlicensed spectrum and device in the embodiments of the present application can improve, in terms of communication in an unlicensed spectrum, the efficiency of a terminal device detecting, in a COT, information indicating data reception and transmission.

Description

The present application relates to the field of communication, and particularly, to acommunication method and device for unlicensed spectrum.BACKGROUNDUnlicensed spectrum is the spectrum that can be used for 5 communication of radio deviceand is divided by countries and regions. This spectrum is generally considered as a sharedspectrum, i.e. the communication device in different communication systems can use thespectrum if it meets the regulations set by the countries or regions on the spectrum, and thereis no need to apply to the government for an exclusive spectrum authorization.10 The New radio (NR) system supports data transmission on the unlicensed spectrum. Forthe NR-Unlicensed (NR-U) system, how to improve the efficiency of a terminal device indetecting the information used for indicating data transceiving within the Channel OccupancyTime (COT) is an urgent problem to be solved.SUMMARY15 The embodiment of present application provides a communication method and devicefor the unlicensed spectrum, which can improve the efficiency of the terminal device indetecting the information used for indicating data transceiving within the COT, in the aspect ofthe unlicensed spectrum communication.In a first aspect, a communication method for unlicensed spectrum is provided, the20 method including: detecting, by a terminal device, first information used for indicating ChannelOccupancy Time (COT) information; anddetecting, by the terminal device, second information used for indicating data receivingor sending within the COT, based on the COT information.In this solution, the terminal device detects the first information for indicating the COT25 within the COT, so that the terminal device can obtain the information related to the COT afterthe first information has been detected. Therefore, when detecting the second informationused for indicating data transceiving within the COT based on the COT information, theefficiency of detecting the second information can be improved.In a second aspect, a communication method for unlicensed spectrum is provided, the30 method including: detecting, by a terminal device, a reference signal, where the referencesignal is used for indicating that a network device has obtained Channel Occupancy Time (COT);anddetecting, by the terminal device, second information used for indicating data receivingor sending within the COT, after the reference signal has been detected;3where there are a plurality of the reference signals within the COT.In this solution, there may be a plurality of the reference signals within the COT, whichcan avoid the problem that if there is only one reference signal within the COT, the terminaldevice may not detect the reference signal due to detection issues of the terminal device orchannel quality issues. That is, the problem that the 5 terminal device misses to detect thereference signal may be avoid.In a third aspect, a communication method for unlicensed spectrum is provided, themethod including: sending, by a network device, first information used for indicating ChannelOccupancy Time (COT) information to a terminal device; and sending, by the network device,10 second information used for indicating data receiving or sending to the terminal device.In a fourth aspect, a communication method for unlicensed spectrum is provided, themethod including: sending, by a network device, a plurality of reference signals to a terminaldevice, within Channel Occupancy Time (COT), where the reference signals are used forindicating that the network device has obtained the COT; and sending, by the network device,15 second information used for indicating data receiving or sending to the terminal device.In a fifth aspect, a terminal device is provided for performing the method in any one ofthe above-mentioned first aspect to the second aspect or in each implementation thereof.In particular, the terminal device includes a functional module configured to perform themethod in any one of the above-mentioned first aspect to the second aspect or in each20 implementation thereof.In a sixth aspect, a terminal device is provided for performing the method in any one ofthe above-mentioned third aspect to the fourth aspect or in each implementation thereof.In particular, the network device includes a functional module configured to perform themethod in any one of the above-mentioned third aspect to the fourth aspect or in each25 implementation thereof.In a seventh aspect, a terminal device is provided, including a processor and a memory.The memory is configured to store a computer program, and the processor is configured to calland run the computer program stored in the memory to perform the method in any one of theabove-mentioned first aspect to the second aspect or in each implementation thereof.30 In an eighth aspect, a network device is provided, including a processor and a memory.The memory is configured to store a computer program, and the processor is configured to calland run the computer program stored in the memory to perform the method in any one of theabove-mentioned third aspect to the fourth aspect or in each implementation thereof.In a ninth aspect, a chip is provided for performing the method in any one of the above4mentioned first aspect to the fourth aspect or in each implementation thereof.In particular, the chip includes a processor configured to call and run a computer programfrom a memory, so that a device installed with the chip performs the method in any one of theabove-mentioned first aspect to the fourth aspect or in each implementation thereof.In a tenth aspect, a computer-readable storage medium 5 is provided for storing acomputer program that enables a computer to perform the method in any one of the abovementionedfirst aspect to the fourth aspect or in each implementation thereof.In an eleventh aspect, a computer program product is provided, including a computerprogram instruction that enables a computer to perform the method in any one of the above10mentioned first aspect to the fourth aspect or in each implementation thereof.In a twelfth aspect, a computer program is provided, which when running on a computerenables a computer to perform the method in any one of the above-mentioned first aspect tothe fourth aspect or in each implementation thereof.BRIEF DESCRIPTION OF THE DRAWINGS15 Fig. 1 is a schematic diagram of architecture of a communication system according to anembodiment of the present application.Fig. 2 is a schematic diagram of PDCCH detection on NR licensed spectrum according toan embodiment of the present application.Fig. 3 is a schematic diagram of a waste of resources caused by the interval between a20 starting position of COT and a starting position of CORESET within the COT according to anembodiment of the present application.Fig. 4 is a schematic diagram of reducing a monitoring period of the CORESET accordingto an embodiment of the present application.Fig. 5 is a schematic diagram of indicating the starting position of the COT by a reference25 signal according to an embodiment of the present application.Fig. 6 is a schematic flow chart of a communication method for unlicensed spectrumaccording to an embodiment of the present application.Fig. 7 is a schematic diagram of detecting the reference signal and first information by aterminal device according to an embodiment of the present application.30 Fig. 8 is another schematic diagram of detecting the reference signal and the firstinformation by the terminal device according to an embodiment of the present application.Fig. 9 is still another schematic diagram of detecting the reference signal and the firstinformation by the terminal device according to an embodiment of the present application.Fig. 10 is a schematic diagram of missing to detect the reference signal by the terminal5device according to an embodiment of the present application.Fig. 11 is a schematic flow chart of another communication method for the unlicensedspectrum according to an embodiment of the present application.Fig. 12 is a schematic diagram of a plurality of the reference signals being in the COTaccording to an embodiment 5 of the present application.Fig. 13 is a schematic block diagram of the terminal device provided by an embodimentof the present application.Fig. 14 is a schematic block diagram of the terminal device provided by an embodimentof the present application.10 Fig. 15 is a schematic block diagram of the network device provided by an embodimentof the present application.Fig. 16 is a schematic block diagram of the network device provided by an embodimentof the present application.Fig. 17 is a schematic block diagram of a communication device provided by an15 embodiment of the present application.Fig. 18 is a schematic block diagram of a chip provided by an embodiment of the presentapplication.Fig. 19 is a schematic block diagram of a communication system provided by anembodiment of the present application.20 DETAILED DESCRIPTIONThe technical solutions in the embodiments of the present application will be describedbelow in conjunction with the drawings in the embodiments of the present application.Obviously, the described embodiments are part of the embodiments of the present application,rather than all of them. Based on the embodiments in the present application, all the other25 embodiments obtained by those of ordinary skill in the art without creative work fall within theprotection scope of the present application.The technical solution in the embodiments of the present application can be applied tovarious communication systems, such as a Global System of Mobile communication (GSM)system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple30 Access (WCDMA) system, General Packet Radio Service (GPRS), a Long Term Evolution (LTE)system, an Advanced Long Term Evolution (LTE-A) system, a New Radio (NR) system, anevolution system of NR system, a LTE-based access to unlicensed spectrum (LTE-U) system, aNR-based access to unlicensed spectrum (NR-U) system, a Universal MobileTelecommunication System (UMTS) system, Wireless Local Area Networks (WLAN), Wireless6Fidelity (WiFi), a next generation communication system or other communication system, etc.Generally speaking, traditional communication systems support a limited number ofconnections and are easy to implement. However, with the development of communicationtechnology, the mobile communication systems will not only support traditionalcommunication, but also support, for example, Device 5 to Device (D2D) communication,Machine to Machine (M2M) communication, Machine Type Communication (MTC), andVehicle to Vehicle (V2V) communication, etc. The embodiments of the present application canalso be applied to these communication systems.Optionally, the communication system in the embodiment of the present application10 may be applied to a Carrier Aggregation (CA) scenario, may also be applied to a DualConnectivity (DC) scenario, and may also be applied to a Standalone (SA) network deploymentscenario.Exemplarily, a communication system 100 applied in the embodiments of the presentapplication is shown in Fig. 1. The communication system 100 may include a network device15 110, which may be a device that communicates with a terminal device 120 (or referred as acommunication terminal or a terminal). The network device 110 may provide communicationcoverage for a specific geographic area, and may communicate with the terminal device locatedwithin the coverage area. Optionally, the network device 110 may be a Base Transceiver Station(BTS) in a GSM system or a CDMA system, and may also be a Node B (NB) in a WCDMA system,20 and may also be an Evolutional Node B (eNB or NodeB) in an LTE system, or a wireless controllerin a Cloud Radio Access Network (CRAN), or the network device may be a mobile switchingcenter, a relay station, an access point, an in-vehicle device, a wearable device, a hub, a switch,a bridge, a router, a network side device in a 5G network or a network device in the futureevolved Public Land Mobile Network (PLMN), etc.25 The communication system 100 also includes at least one terminal device 120 locatedwithin the coverage area of the network device 110. As the “terminal device” used herein, itincludes, but is not limited to, connection via a wired line, such as via Public SwitchedTelephone Networks (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cableconnection; and / or another data connection / network; and / or via a wireless interface, for30 example, a transmitter for a cellular network, a Wireless Local Area Network (WLAN), a digitalTV network such as a DVB-H network, a satellite network and an AF-FM broadcast; and / or anapparatus of another terminal device which is arranged to receive / send communicationsignals; and / or an Internet of Things (IoT) device. The terminal device arranged to communicatevia a wireless interface may be referred to as a “wireless communication terminal”, a “wireless7terminal” or a “mobile terminal”. Examples of mobile terminals include, but are not limited to,a satellite or cellular phone; a Personal Communications System (PCS) terminal that maycombine a cellular wireless phone with data processing, fax and data communicationcapabilities; a PDA that may include a radio phone, a pager, an Internet / intranet access, a Webbrowser, a memo pad, a calendar, and / or a Global Positioning 5 System (GPS) receiver; and aconventional laptop and / or a palmtop receiver or other electric apparatus including aradiophone transceiver. The terminal device may refer to an access terminal, a User Equipment(UE), a user unit, a user station, a mobile station, a mobile platform, a remote station, a remoteterminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user10 agent or a user apparatus. The access terminal may be a cellular phone, a cordless phone, aSession Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a personal digitalassistant (PDA), a handheld device with wireless communication function, a computing deviceor other processing devices connected to wireless modems, an in-vehicle device, a wearabledevice, a terminal device in a 5G network or a terminal device in the future evolved PLMN, etc.15 Optionally, D2D communication may be performed between the terminal devices 120.Fig. 1 exemplarily illustrates one network device and two terminal devices. Optionally,the communication system 100 may include a plurality of network devices, and the coveragearea of each network device may include other numbers of terminal devices, which is notlimited by the embodiments of the present application.20 Optionally, the communication system 100 may also include other network entities suchas a network controller, a mobile management entity, etc., which is not limited by theembodiments of the present application.It should be understood that a device with communication function in thenetwork / system in the embodiments of the present application can be referred to as a25 communication device. By the example of the communication system 100 shown in Fig. 1, thecommunication device may include a network device 110 and a terminal device 120 withcommunication function, and the network device 110 and the terminal device 120 may be thespecific devices described above, which will not be elaborated here; and the communicationdevice may also include other devices in the communication system 100, such as other network30 entities such as a network controller, a mobile management entity, etc., which is not limited bythe embodiments of the present application.It should be understood that the terms "system" and "network" are often usedinterchangeably herein. The term "and / or" herein is only to describe a kind of associationrelationship among associated objects, and means that there may be three kinds of8relationships. For example, A and / or B may mean that there are the following three cases: Aexists alone, A and B exist at the same time, and B exists alone. In addition, the character " / "herein generally indicates that the associated objects are in an "or" relationship.The method in the embodiment of the present application may be applied to thecommunication of the unlicensed spectrum, and may also be 5 applied to other communicationscenarios, such as a communication scenario of the licensed spectrum.As shown in Fig. 2, on the NR licensed spectrum, a terminal device may detect a PhysicalDownlink Control Channel (PDCCH) on a preconfigured Control Resource Set (CORESET). Afterhaving detected the PDCCH scrambled by a Radio Network Temporary Identity (RNTI), the10 terminal device may obtain a scheduling indication through Downlink Control Information (DCI)carried on the PDCCH, and may receive data on the indicated Physical Downlink Shared Channel(PDSCH) resource position, or send data on the indicated Physical Uplink Shared Channel(PUSCH) resource.On the NR licensed spectrum, the preconfigured CORESET mentioned above is a set of15 control resources that appears periodically. The network device may send DCI messages on oneor more resources in this set of resources, to schedule the terminal device to perform datareceiving or sending. By detecting the DCI message on the PDCCH channel on this set ofresources, the terminal device may know whether the terminal device is scheduled, and obtainscheduling information, and then perform data transceiving.20 On the NR licensed spectrum, each terminal device may be configured with a plurality ofCORESETs. As a set of control resources appearing periodically, each CORESET has theattributes of frequency domain resource position, time domain resource position and the like.Respective control resource sets configured for the UE may have configuration parameterswhich are different in whole or in part.25 On the NR licensed spectrum, each CORESET of each terminal may be associated withspecific time sequence configuration information and other configuration information. Thesepieces of configuration information are configured in the form of search spaces, where thesearch spaces may include a period of a control resource appearing periodically, an offsetwithin the period, aggregation level information, etc.30 When the licensed spectrum is being studied, due to precious resources of the licensedspectrum, the study and utilization of the unlicensed spectrum are also carried out at the sametime.The unlicensed spectrum is the spectrum that can be used for radio devicecommunication, divided by countries and regions. This spectrum may be generally considered9as shared spectrum, that is, the communication devices in different communication systemscan use the spectrum if meeting the regulations set by the country or region on the spectrum,without applying to the government for an exclusive spectrum authorization. In order to makevarious communication systems that use the unlicensed spectrum for wireless communicationto coexist friendly on this spectrum, the communication 5 device may follow the principle ofListen Before Talk (LBT) when communicating on the unlicensed spectrum. That is, beforesending a signal on a channel of the unlicensed spectrum, the communication device needs toperform channel sensing (or referred to as channel detection) firstly. Only when the result ofchannel sensing is that the channel is idle, the communication device can send the signal; and10 if the result of channel sensing by the communication device on the unlicensed spectrum isthat the channel is busy, then the signal cannot be sent.In order to understand the present application more clearly, two concepts applied in theunlicensed spectrum communication will be described below.Maximum Channel Occupancy Time (MCOT) may refer to the maximum length of time15 within which the channel of the unlicensed spectrum is allowed to be used for signaltransmission after LBT succeeds. There are different MCOTs under different channel accessschemes. The maximum value of MCOT may be for example 10ms. It should be understoodthat the MCOT is the time occupied by signal transmission.COT may refer to the length of time for signal transmission by using the channel of20 unlicensed spectrum after LBT succeeds, and within this length of time, the signal may occupythe channel discontinuously. The length of time occupied by signal transmission in the COTdoes not exceed MCOT.Based on the above characteristics of the unlicensed spectrum, data sending on theunlicensed spectrum can only be performed after the network device obtains an available25 channel (i.e. after obtaining one COT through LBT). Under this constraint, a mode of performingdata sending and corresponding receiving directly on the unlicensed spectrum is a design ofmultiplexing the NR licensed spectrum. In other words, after determining the CORESET and itsconfiguration information, such as a search space, the network device may send thedetermined CORESET and its configuration information to the terminal device. The network30 device may schedule the terminal device to perform data sending or receiving on one or moreresources of this set of resources. The terminal device is configured with the CORESET and itsconfiguration information. By detecting the PDCCH channel on the CORESET, the terminaldevice may know whether it is scheduled, and obtain the scheduling information, and thenperform data transceiving.10In the above process, when there is a time interval between the starting time of the COToccupied by the network device and the CORESET configured for the terminal device, as shownin Fig. 3, on the one hand, the channel resources within the interval time will not be effectivelyutilized by the network device and the terminal device, and the idle channel may be occupiedby other device again, thereby the system performance may be 5 affected. On the other hand,since the resources within the time interval may not be effectively utilized by the networkdevice and the terminal device, even if the above idle channel is not occupied by other deviceagain, these channel resources are in an idle state, resulting in a waste of resources.One way to solve the above problem is to increase configuration density of the CORESET,10 i.e. to shorten a monitoring period of the CORESET (in the NR, the period is configured in thesearch space). That is, the time interval between the starting position of the CORESET and thestarting position of the COT is shortened as far as possible in the time domain, thereby reducingthe waste of resources, as shown in Fig. 4.It can be seen that in the above method, the terminal device needs to monitor more15 CORESET positions, and such frequent monitoring will increase the energy consumption of theterminal device. In addition, if the method of shortening the monitoring period of CORESET isadopted, this relatively dense configuration and monitoring mode of CORESET may generallygain only outside the COT and at the initial stage of the COT. The reason is that only when thenetwork device does not know when the COT starts, it needs to use the relatively dense control20 resource set configuration to wait for the success of LBT. After the base station has occupiedthe channel, the base station may schedule data sending within the COT as needed.Correspondingly, on the terminal device side, the terminal device may only use the denseCORESET configuration outside the COT to detect the PDCCH, so as to cope with the start ofthe COT at any time. Once the terminal device determines that the COT has begun, it may use25 relatively sparse CORESET configuration to detect the PDCCH, so as to avoid the complexity andenergy consumption caused by additional detection.On the basis of the above analysis, it can be found that the starting position of the COTis determined by the result of LBT of the network device, so the starting position of the COT isuncertain, and the terminal device may not know it in advance. In this case, how the terminal30 device to obtain the starting position of the COT is a problem that needs to be studied andsolved.Fig. 5 is a proposed method for a terminal device to obtain a starting position of the COT.When the LBT of the network device succeeds, the network device may send a reference signalto the terminal device at the starting position of the COT. When the terminal device detects11that the reference signal begins, it may obtain scheduling information for data transceiving bydetecting a DCI message carried on a PDCCH on a configured CORESET.However, when the terminal device performs DCI detection on the configured CORESET,how to improve the efficiency of the terminal device in detecting the information used forindicating data transceiving within the COT has not been 5 clearly stipulated. The embodimentof the present application provides the following scheme, in which the terminal device mayimprove the efficiency of detecting the information used for indicating data transceiving withinthe COT. The detailed introduction will be described below.Fig. 6 is a schematic flow chart of a communication method 200 for the unlicensed10 spectrum according to an embodiment of the present application. The method 200 includes atleast part of the following.It should be noted that the embodiment of the present application takes a sending deviceas a network device and a receiving device as a terminal device as an example for description,but the present application is not limited to this. The method of the embodiment of the15 application may also be applied to other scenarios, such as a scenario of D2D transmission orV2V transmission, i.e. both the sending device and the receiving device are terminal devices.In 210, a network device sends first information to a terminal device, where the firstinformation is used for indicating COT information of the COT obtained by the network device.In 220, the terminal device detects the first information sent by the network device.20 In 220, the terminal device detects second information used for indicating data receivingor sending within the COT, based on the COT information.The COT information may include, but is not limited to, at least one of: a length of theCOT, uplink and downlink configuration information within the COT, Synchronization SignalBlock (SSB) information within the COT, Channel-State Information Reference Signal (CSI-RS)25 configuration information within the COT and a rate matching resource within the COT.Since the detection modes of the terminal device within the COT and outside the COTmay be different, the terminal device obtains the length of the COT, so that the terminal devicemay determine whether it is within the COT or outside the COT at present, thereby differentdetection modes may be adopted.30 After obtaining the uplink and downlink configuration information within the COT, theterminal device may not need to detect the DCI on the entire CORESET, but only needs to detectthe DCI on the CORESET in the downlink part, thereby avoiding unnecessary detection andimproving the detection efficiency.The terminal device obtains the SSB information and the CSI-RS configuration12information within the COT, which may eliminate the interference of SSB and CSI-RS ondownlink sending data, thereby the reliability of the terminal device in data receiving orsending can be improved.After obtaining the rate matching resource, the terminal device may determine whichresources on the CORESET have been occupied, so that unavailable resources 5 may be avoidedduring the detection, and the detection efficiency may be improved.It should be understood that in the embodiment of the present application, "first" and"second" are only used to distinguish different objects, but do not constitute the restriction ofthe scope of the embodiment of the present application.10 Optionally, detecting the first information by the terminal device may include thefollowing steps: the terminal device obtains a second resource, where the second resource mayinclude a CORESET resource and a search space associated with the CORESET resource, andthen the terminal device may detect the first information on the second resource.Optionally, the terminal device may obtain the second resource based on a protocol15 provision; or, the terminal device may obtain the second resource by a broadcast message; or,the terminal device may receive a Radio Resource Control (RRC) dedicated signaling configuredwith the second resource, and after having received the RRC dedicated signaling, the terminaldevice may obtain the second resource.Regarding to the specific implementation process of the method 200, specifically, for the20 terminal device, the terminal device may determine two sets of different resources firstly, i.e.the second resource and the third resource. For example, the second resource may be a set ofCORESET resources, including configuration of the CORESET itself and configuration of a searchspace associated with the CORESET. The third resource is another set of CORESET resources,which may include configuration of the CORESET itself and configuration of a search space25 associated with the CORESET. The terminal device may detect the first information on thesecond resource firstly, where the first information may be carried on a first channel scrambledby a first sequence. After the terminal device has detected the first information on the secondresource, the terminal device may begin to detect the second information on the thirdresource, where the second information may be carried on a second channel scrambled by a30 second sequence.Correspondingly, for the network device, the network device determines the secondresource and the third resource, and when the network device has detected that the channelis idle and available, it sends the first information on the second resource within the COT, andschedules data transceiving of the terminal device on the third resource within the COT.13Optionally, detecting the second information by the terminal device may be detectingthe second information through a PDCCH scrambled by a Cell Radio Network TemporaryIdentity (C-RNTI).Optionally, the PDCCH in the embodiment of the application may be a common PDCCH,or may be an Enhanced Physical Downlink Control Channel 5 (EPDCCH), a Machine TypeCommunication Physical Downlink Control Channel (MPDCCH), a Physical Sidelink ControlChannel (PSCCH), or a Narrowband Physical Downlink Control Channel (NPDCCH), which is notspecifically limited in the embodiment of the application.It should be understood that the mode in which the terminal device determines the third10 resource may refer to the mode in which the terminal device determines the second resource,which will not be repeated here.Optionally, the network device may send the first information to the terminal device ata starting position of the COT, and correspondingly, the terminal device may detect the firstinformation at the starting position of the COT.15 The terminal device detects the first information at the starting position of the COT, sothat it may obtain the COT information at the starting position of the COT, thereby thedetection efficiency of detecting the DCI may be more effectively improved.In the embodiment of the present application, there may be a plurality pieces of firstinformation within one COT. That is, after the LBT of the network device succeeds, the network20 device may send the first information to the terminal device several times within the COT.If there is only one piece of the first information within the COT, there may be a problemthat the terminal device fails to detect the first information due to detection issues or channelquality issues. Due to the plurality pieces of the first information within the COT, the problemthat the terminal device misses to detect the first information can be avoided.25 In the embodiment of the present application, the method 200 may further include: theterminal device determining that the COT begins.Preferably, the mode in which the terminal device determines that the COT begins maybe as follows: the network device sends a reference signal to the terminal device, where thereference signal is used for indicating that the network device has obtained the COT, and after30 the terminal device has detected the reference signal, it may determine that the COT begins.The network device sends the reference signal to the terminal device. As an example, thenetwork device may only send one reference signal to the terminal device at the startingposition of the COT.As another example, the network device may send the reference signal several times14within the COT. In other words, there may be a plurality of the reference signals within the COT,and the reference signals may be distributed at different positions of the COT, where thedifferent positions may include the starting position of the COT. In this way, the problem thatthe terminal device misses to detect the reference signal can be avoided.The network device may send the reference signal to 5 the terminal device periodicallywithin the COT. For example, the network device may send the reference signal to the terminaldevice every 2ms.It can be seen that the embodiment of this application may include several cases: a. thenetwork device sends one piece of first information and one reference signal to the terminal10 device; b. the network device sends a plurality pieces of first information and one referencesignal to the terminal device ; c. the network device sends one piece of first information and aplurality of reference signals to the terminal device; d. the network device sends a pluralitypieces of first information and a plurality of reference signals to the terminal device.Optionally, the reference signal in the embodiment of the application may be any one of15 the following signals: a random access preamble (Preamble), a Primary Synchronization Signal(PSS), a Secondary Synchronization Signal (SSS), a Demodulation Reference Signal (DMRS), aChannel-State Information Reference Signal (CSI-RS), or a newly designed reference signal usedfor indicating the COT information.If the reference signal is a DMRS, the first resource used for detecting the reference signal20 by the terminal device may be a same resource as the second resource.Optionally, the first resource and the second resource may be a CORESET resource. Itshould be noted that a resource actually occupied by the DMRS in the CORESET resource anda resource actually occupied by the first information in the CORESET resource are not the sameresource.25 Optionally, the first resource (for ease of description, the first resource and the secondresource are collectively referred to as the first resource here) may be different from a thirdresource, i.e. the first resource may be a different CORESET from the third resource; or, thefirst resource and the third resource may be different PDCCHs in the same CORESET resource.At this time, detecting the reference signal by the terminal device may include the30 following steps: the terminal device obtains the first resource, where the first resource mayinclude a CORESET resource and a search space associated with the CORESET resource, andthen the terminal device may detect the detection signal on the first resource.Optionally, the terminal device may obtain the first resource based on a protocolagreement; or, the terminal device may obtain the first resource through a broadcast message;15or, the terminal device may obtain a RRC dedicated signaling configured with the first resource,and after having received the RRC dedicated signaling, the terminal device may obtain the firstresource.The network device sends one piece of first information and one reference signal to theterminal device within the COT, as shown in Fig. 7. In Fig, 7, CORESET 1 is 5 the first resource (forease of description, the first resource and the second resource are collectively referred to asthe first resource here), and CORESET 2 is the third resource. Specifically, the terminal devicemay determine two different sets of resources, i.e. the first resource and the third resource.For example, the first resource may be a set of CORESET resources, including configuration of10 the CORESET itself and configuration of a search space associated with the CORESET, and DMRSconfiguration on the CORESET. The third resource is another set of CORESET resources,including configuration of the CORESET itself and configuration of a search space associatedwith the CORESET.The terminal device may detect the reference signal (DMRS) on the first resource firstly,15 and after having detected the reference signal, the terminal device knows that the COT hasbegun, then the terminal device may detect the first information on the first resource. Sincethe complexity of signal detection is less than the complexity of information detection on thechannel, the terminal device determines that the current COT has begun by detecting thereference signal firstly, i.e. there is the first information, and then detects the first information20 on the first resource, thereby the detection complexity of the terminal device can be reduced.When the terminal device has detected the first information on the first resource, theterminal device may begin to detect second information on the third resource, where thesecond information may be carried on a second channel scrambled by a second sequence.Correspondingly, for the network device, the network device determines the first resource and25 the second resource, and when the network device has detected that the channel is idle andavailable, it sends the reference signal and the first information on the first one of the firstresources within the COT, and schedules data transceiving of the terminal device on the secondresource within the COT.It should be understood that the specific example of the embodiment of the present30 application is only used to help those skilled in the art to understand the embodiment of thepresent application better, rather than limiting the scope of the embodiment of the presentapplication.The network device sends a plurality pieces of first information and a plurality ofreference signals to the terminal device within the COT, as shown in Fig. 8. In Fig. 8, CORESET 116is the second resource, and CORESET 2 is the third resource. It should be understood that whenthe network device sends the plurality pieces of the first information to the terminal devicewithin the COT, the implementation of the network device and the terminal device may referto the implementation of the network device and the terminal device when the network devicesends a plurality pieces of first information to the terminal 5 device within the COT, which willnot be described again for brevity.If the reference signal is a signal other than the DMRS, the first resource may be differentfrom the second resource.At this time, detecting the reference signal by the terminal device may include the10 following steps: the terminal device obtains configuration information of the reference signal,where the configuration information of the reference signal may include a generation mode ofthe reference signal and a first resource, and then the terminal device may detect the referencesignal on the first resource.Specifically, for the terminal device, the terminal device may determine the configuration15 information of the reference signal, where the configuration information of the referencesignal may include but not limit to the generation mode of the reference signal and timefrequency-domain position information of the reference signal, i.e. the first resourceinformation, where the first resource may be a periodical resource. The terminal devicedetermines a set of CORESET resources, where the CORESET resources may include but not20 limit to configuration of the CORESET itself and configuration of a search space associated withthe CORESET, i.e. the second resource. The terminal device determines another set of CORESETresources, which may include but not limit to configuration of the CORESET itself andconfiguration of a search space associated with the CORESET, i.e. the third resource.After the terminal device detects the reference signal on the first resource, it determines25 that the current COT begins, i.e. there is the COT first information, and then detects the firstinformation on the second resource, where the first information is carried on a second channelscrambled by a second sequence. After the terminal device has detected the first informationon the second resource, it may detect second information on the third resource, where thethird information may be carried on a third channel scrambled by a third sequence.30 It can be seen from Fig. 8 that although the problem that the terminal device misses todetect the reference signal and the first information can be avoided by sending the pluralitypieces of the first information and the plurality of the reference signals to the terminal devicewithin the COT by the network device, some disadvantages are also brought out. Since thereference signal and the first information need to be sent several times within the COT, the17limited COT resources are occupied by the reference signal and the first information, and thenthe resource overhead is too large.For the above problem, a period of the first resource may be set to be less than a periodof the second resource.Specifically, referring to Fig. 9 in which CORESET 1 is the second 5 resource and CORESET 2is the third resource, the description takes the reference signal as a Preamble as an example.The terminal device determines the first resource, the second resource, the third resource. Themode in which the terminal device determines the first resource, the second resource and thethird resource may refer to the above description, which will not be described here again.10 After the terminal device densely detects the reference signal on the first resource witha small detection period, it determines that the current COT has begun, i.e. there is the COTfirst information, and then detects first information on the second resource, where the firstinformation is carried on a second channel scrambled by a second sequence. After the terminaldevice has detected the first information, the terminal device may utilize the relatively sparse15 third resource to detect second information, where the third information is carried on a thirdchannel scrambled by a third sequence.In the above technical scheme, the terminal device densely detects the reference signalon the first resource with a small detection period. This dense first resource is beneficial toshorten the time interval between the starting position of the COT and the position of the first20 resource, which may improve resource utilization. The terminal device utilizes the relativelysparse third resource to detect the second information, which may reduce the detectioncomplexity and the energy consumption of the terminal device.In one possible embodiment, detecting the first information by the terminal device mayinclude: the terminal device detecting the first information based on a parameter of a reference25 signal.Optionally, the parameter of the reference signal may be a sequence of the referencesignal or a time-frequency resource position of the reference signal.In this embodiment, the terminal device may determine the position of the referencesignal within the COT based on the parameter of the reference signal, and then detects the first30 information based on the position of the reference signal within the COT.Specifically, when the network device sends the reference signal to the terminal device,a parameter of the reference signal sent at the starting position of the COT may be differentfrom a parameter of the reference signal sent at other position of the COT.For example, the network device adopts sequence A for sending in a first time unit within18the COT, and adopts sequence B for sending in other time unit within the COT. The time unitmay be a sub-frame, a time slot, a time domain symbol, or a Short Transmission Timing Interval(sTTI). In this way, when the network device has detected the sequence A, it may determinethat it is currently the first time unit within the COT; and when the network device has detectedthe sequence B, it may determine that it is currently a non-5 first time unit within the COT.In this way, the terminal device may distinguish whether it is currently at the startingposition of the COT or in the position within the COT through the reference signal, thereby theterminal device may adopt different time sequences to detect the first information and thesecond information on different perconfigured resources.10 For example, if the network device utilizes a fourth resource to send the reference signalon the starting position of the COT and utilizes a fifth resource to send the reference signal onother position of the COT, the detection time sequence of the fourth resource and thedetection time sequence of the fifth resource may be different (the detection periods aredifferent). The terminal device may adopt a denser detection period in the first time slot within15 the COT, such as detecting once every X (X=4) symbols. The terminal device may adopt a sparserdetection period in other time slot within the COT, such as every Y(Y=7) symbols, or every Z(Z=1 / 2 / 4 / 8) symbols.In one possible embodiment, during the time after the terminal device has detected thereference signal and before the terminal device has detected the first information, and during20 the time after the terminal device has detected the reference signal and after the terminaldevice has detected the first information, the terminal device may adopt different detectionmodes when detecting the second information on the determined CORESET.Optionally, a resource for detecting the second information before having detected thefirst information and a resource for detecting the second information after having detected the25 first information, by the terminal device, may be different. Exemplarily, before the terminaldevice has detected the first information, the resource for detecting the second informationmay include an uplink resource; after the terminal device has detected the first information,the resource for detecting the second information may include an uplink resource.For example, before the terminal device has detected the first information, the terminal30 device does not obtain COT information, and is not certain with a rate matching resource andconfiguration situation of uplink and downlink within the COT, therefore the terminal devicedetects the second information on the determined CORESET. After the terminal device hasdetected the first information, the terminal device obtains the rate matching resource and theconfiguration situation of the uplink and downlink within the COT, the terminal device may only19detect the second information on the determined CORESET within the downlink part.In this way, it may reduce unnecessary PDCCH detection by the terminal device, andreduce the energy consumption of the terminal device at the same time.In the embodiment of the present application, the terminal device detects the firstinformation used for indicating the COT within the COT, so that 5 the terminal device may obtaininformation related to the COT after having detected the first information. Therefore, whenthe terminal device detects the second information used for indicating data transceiving withinthe COT based on the COT information, the efficiency of detecting the second information maybe improved.10 If the network device only sends one reference signal within the COT, i.e. only sends thereference signal to the terminal device at the starting position of the COT, when the terminaldevice fails to detect the reference signal due to detection issues of the terminal device orchannel quality issues, i.e. when the terminal device misses the reference signal, even if LBT ofthe network device successfully obtains the COT, the network device may not successfully15 schedule data transceiving of the terminal device, because at this time the terminal device willnot monitor the CORESET within the COT, as shown in Fig. 10.Regarding to this, the embodiment of the present application provides a scheme, whichmay avoid the potential issue that the COT resource missed to be detected by the terminaldevice may not be utilized when the reference signal is only sent at the starting position of the20 COT. The detailed introduction will be described below.Fig. 11 is a schematic flow chart of a communication method 300 for the unlicensedspectrum according to an embodiment of the present application. The method 300 includes atleast part of the following.It should be noted that, the embodiment of the present application takes a sending25 device as a network device and a receiving device as a terminal device as an example fordescription, but the present application is not limited to this. The method of the embodimentof the application may also be applied to other scenarios, such as a scenario of D2Dtransmission or V2V transmission, i.e. both the sending device and the receiving device areterminal devices.30 In 310, a network device sends a plurality of reference signals to a terminal device, wherethe reference signals are used for indicating that the network device has obtained the COT.In 320, the terminal device detects the reference signal.In 330, after the terminal device has detected the reference signal, the terminal devicedetects second information used for indicating data receiving or sending within the COT.20Optionally, the plurality of the reference signals within the COT may be periodicallydistributed at different positions of the COT, where the different positions may include astarting position of the COT.Optionally, the reference signal in the embodiment of the application may be any one ofthe following signals: a Preamble, a PSS, a SSS, a DMRS, a CSI-5 RS or a newly designed referencesignal used for indicating first information.If the reference signal is a DMRS, the first resource may be a CORESET resource. At thistime, detecting the reference signal by the terminal device may include: the terminal deviceobtains a first resource, where the first resource may include a CORESET resource and a search10 space associated with the CORESET resource, and then the terminal device may detect thedetection signal on the first resource.If the reference signal is a signal other than a DMRS, detecting the reference signal bythe terminal device may include: the terminal device obtains configuration information of thereference signal, where the configuration information of the reference signal may include a15 generation mode of the reference signal and a first resource, and then the terminal device maydetect the reference signal on the first resource.Optionally, the terminal device may obtain the first resource based on a protocolagreement; or, the terminal device may obtain the first resource through a broadcast message;or, the terminal device may obtain a RRC dedicated signaling configured with the first resource,20 and after having received the RRC dedicated signaling, the terminal device may obtain the firstresource.Specifically, referring to Fig. 12, the description takes the reference signal as a Preambleas an example. After the network device performs LBT successfully, the network device sendsthe reference signal several times within the COT, and the terminal device obtains25 configuration information of the reference signal, where the configuration information of thereference signal may include a generation mode of the reference signal and information of atime-frequency-domain position available for sending the reference signal, i.e. information ofthe first resource. The terminal device obtains configuration information of a third resource(CORESET), where the configuration information of the third resource may include30 configuration of the CORESET itself and configuration of a search space associated with theCORESET. After having detected the reference signal on the first resource, the terminal devicedetects second information on the third resource. At this time, the corresponding situation isthat: the terminal device has monitored the starting position of the COT by detection of thepreamble, and utilizes a preconfigured CORESET resource to detect a DCI message carried on a21PDCCH within the COT, so that the terminal device can schedule data transceiving.Correspondingly, for the network device, the network device determines the configurationinformation of the reference signal, and determines the configuration information of the thirdresource. When having detected that the channel is idle and available, the network devicesends the reference signal several times on the first resource 5 within the COT, and schedulesdata transceiving of the terminal device on the third resource within the COT.Optionally, the first resource and the third resource may be different. At this time, aperiod of the first resource may be less than a period of the third resource.In one possible embodiment, detecting the reference signal by the terminal device may10 include: the terminal device detecting the reference signal based on a parameter of thereference signal.Optionally, the parameter of the reference signal may be a sequence of the referencesignal or a time-frequency resource position of the reference signal.In the embodiment, the terminal device may determine a position of the reference signal15 within the COT based on the parameter of the reference signal, and then detect the secondinformation based on the position of the reference signal within the COT.Specifically, when the network device sends the reference signal to the terminal device,a parameter of the reference signal sent at the starting position of the COT is different from aparameter of the reference signal sent at other position of the COT.20 For example, the network device adopts sequence A for sending in a first time unit withinthe COT, and adopts sequence B for sending in other time unit within the COT. In this way,when the network device has detected the sequence A, it may determine that the current timeunit is the first time unit within the COT; and when the network device has detected thesequence B, it may determine that the current time unit is a non-first time unit within the COT.25 In this way, the terminal device may distinguish whether it is currently at the startingposition of the COT or the position within the COT through the reference signal, thereby theterminal device may adopt different time sequences to detect the second information ondifferent perconfigured resources.Optionally, the terminal device may determine whether it is currently within the COT or30 outside the COT through different sequences, or may determine whether it is within the COTor outside the COT currently based on different sequences and predefined (or preconfigured)length of the COT, which is not specifically limited in the embodiment of the presentapplication. In this way, the terminal device may detect the second information within the COT.It should be understood that although the method 200 and the method 300 are described22above respectively, it does not mean that the method 200 and the method 300 areindependent, and the descriptions of each method may refer to each other. For example, ifthere is no contradiction, the related description in the method 200 may be applicable to themethod 300.In the embodiment of the present application, there may 5 be a plurality of the referencesignals within the COT, so that it may avoid the problem that if there is only one reference signwithin the COT, the terminal device may fail to detect the reference signal due to detectionissues of the terminal device or channel quality issues. That is, the problem that the terminaldevice misses detecting the reference signal may be avoided.10 It should be noted that, on the premise of no conflict, the various embodiments and / orthe technical features of the various embodiments described in the present application may bearbitrarily combined with each other, and the technical scheme obtained after combinationshall also fall into the protection scope of the present application.It should be understood that in various embodiments of the present application, the size15 of the sequence number of the above process does not mean the order of execution, and theexecution order of each process should be determined by its function and internal logic, andshould not constitute any restriction on the implementation process of the embodiment of thepresent application.The data transmission method according to the embodiment of the present application20 has been described in detail above. The communication apparatus according to theembodiment of the present application will be described below in combination with Figs. 13 to17, and the technical feature described in the method embodiment is applicable to thefollowing apparatus embodiment.Fig. 13 illustrates a schematic block diagram of a terminal device 400 of an embodiment25 of the present application. As shown in Fig. 13, the terminal device 400 includes:a processing unit 410, configured to detect first information used for indicating COTinformation.The processing unit 410 is further configured to, based on the COT information, detectsecond information used for indicating data receiving or sending within the COT.30 Optionally, in the embodiment of the present application, the COT information includesat least one of: length of the COT, uplink and downlink configuration information within theCOT, Synchronization Signal Block (SSB) information within the COT, Channel-State InformationReference Signal (CSI-RS) configuration information within the COT and a rate matchingresource within the COT.23Optionally, in the embodiment of the present application, there is a plurality pieces ofthe first information within the COT.Optionally, in the embodiment of the present application, the processing unit 410 isfurther configured to: detect a reference signal, where the reference signal is used forindicating that the network 5 device has obtained the COT.Optionally, in the embodiment of the present application, the processing unit 410 isspecifically configured to: detect the first information, after the reference signal has beendetected.Optionally, in the embodiment of the present application, there are a plurality of the10 reference signals within the COT.Optionally, in the embodiment of the present application, a first resource for detectingthe reference signal and a second resource for detecting the first information by the processingunit 410 are the same resource.Optionally, in the embodiment of the present application, the first resource and the15 second resource are a control resource set (CORESET) resource.Optionally, in the embodiment of the present application, the processing unit 410 isspecifically configured to: obtain the first resource, wherein the first resource includes theCORESET resource and a search space associated with the CORESET resource; and detect thereference signal on the first resource.20 Optionally, in the embodiment of the present application, a third resource is differentfrom the first resource and the second resource, and the third resource is a resource used bythe processing unit 410 for detecting the second information.Optionally, in the embodiment of the present application, a first resource for detectingthe reference signal and a second resource for detecting the first information by the processing25 unit 410 are different.Optionally, in the embodiment of the present application, a period of the first resourceis less than a period of the second resource.Optionally, in the embodiment of the present application, the processing unit 410 isspecifically configured to: obtain configuration information of the reference signal, where the30 configuration information of the reference signal includes a generation mode of the referencesignal and the first resource; and detect the reference signal on the first resource.Optionally, in the embodiment of the present application, the processing unit 410 isspecifically configured to: detect the first information, based on a parameter of the referencesignal.24Optionally, in the embodiment of the present application, the parameter of the referencesignal includes a sequence of the reference signal or a time-frequency resource position of thereference signal.Optionally, in the embodiment of the present application, the processing unit 410obtains a first resource or a second resource by means of a protocol 5 agreement, a broadcastmessage or a Radio Resource Control (RRC) dedicated signaling, where the first resource is aresource used by the processing unit 410 for detecting the reference signal, and the secondresource is a resource used by the processing unit 410 for detecting the first information.Optionally, in the embodiment of the present application, the reference signal is any one10 of a Preamble, a PSS, a SSS, a DMRS, a CSI-RS and a reference signal used for indicating the firstinformation.Optionally, in the embodiment of the present application, a resource used by theprocessing unit 410 for detecting the second information before the first information has beendetected, is different from a resource for detecting the second information after the first15 information has been detected.Optionally, in the embodiment of the present application, after the processing unit 410detects the first information, a resource used for detecting the second information does notinclude an uplink resource.Optionally, in the embodiment of the present application, the processing unit 410 is20 specifically configured to: obtain a second resource, where the second resource includes aCORESET resource and a search space associated with the CORESET resource; and detect thefirst information on the second resource.It should be understood that the terminal device 400 may correspond to the terminaldevice in the method 200, and may implement the corresponding operation of the terminal25 device in the method 200, which will not be described here again for brevity.Fig. 14 illustrates a schematic block diagram of a terminal device 500 of an embodimentof the present application. As shown in Fig. 14, the terminal device 500 includes:a processing unit 510, configured to detect a reference signal, where the reference signalis used for indicating that a network device has obtained the COT.30 The processing unit 510 is further configured to, after the reference signal has beendetected, detect second information used for indicating data receiving or sending within theCOT; andthere are a plurality pieces of the reference signals within the COT.Optionally, in the embodiment of the present application, the reference signals are25periodically distributed at different positions of the COT, and where the different positionsinclude a starting position of the COT.Optionally, in the embodiment of the present application, the processing unit 510 isspecifically configured to: detect the second information based on a parameter of the5 reference signal.Optionally, in the embodiment of the present application, the parameter of the referencesignal includes a sequence of the reference signal or a time-frequency resource position of thereference signal.Optionally, in the embodiment of the present application, a first resource used by the10 processing unit 510 for detecting the reference signal is a control resource set (CORESET)resource.Optionally, in the embodiment of the present application, the processing unit 510 isspecifically configured to: obtain the first resource, where the first resource includes theCORESET resource and a search space associated with the CORESET resource; and detect the15 reference signal, on the first resource.Optionally, in the embodiment of the present application, the processing unit 510 isspecifically configured to: obtain configuration information of the reference signal, where theconfiguration information of the reference signal includes a generation mode of the referencesignal and a first resource; and detect the reference signal on the first resource.20 Optionally, in the embodiment of the present application, the processing unit 510obtains the first resource by means of a protocol agreement, a broadcast message or a RRCdedicated signaling.Optionally, in the embodiment of the present application, a third resource used by theprocessing unit 510 for detecting the second information is different from the first resource.25 Optionally, in the embodiment of the present application, a period of the first resourceis less than a period of the third resource.Optionally, in the embodiment of the present application, the reference signal is any oneof a Preamble, a PSS, a SSS, a DMRS and a CSI-RS.It should be understood that the terminal device 500 may correspond to the terminal30 device in the method 300, and may implement the corresponding operation of the terminaldevice in the method 300, which will not be described here again for brevity.Fig. 15 illustrates a schematic block diagram of a network device 600 of an embodimentof the present application. As shown in Fig. 15, the network device 600 includes:a communication unit 610, configured to send first information used for indicating COT26information to a terminal device, and send second information used for indicating datareceiving or sending to the terminal device.Optionally, in the embodiment of the present application, the COT information includesat least one of: length of the COT, uplink and downlink configuration information within theCOT, Synchronization Signal Block (SSB) information within 5 the COT, Channel-State InformationReference Signal (CSI-RS) configuration information within the COT and a rate matchingresource within the COT.Optionally, in the embodiment of the present application, a plurality pieces of the firstinformation are within the COT.10 Optionally, in the embodiment of the present application, the communication unit 610is further configured to: send a reference signal to the terminal device, where the referencesignal is used for indicating that the network device has obtained the COT.Optionally, in the embodiment of the present application, the communication unit 610is specifically configured to: send a plurality of the reference signals to the terminal device,15 within the COT.Optionally, in the embodiment of the present application, the communication unit 610is specifically configured to: send a plurality of the reference signals to the terminal deviceperiodically, within the COT.Optionally, in the embodiment of the present application, a first resource for sending the20 reference signal and a second resource for sending the first information by the communicationunit 610 are the same resource.Optionally, in the embodiment of the present application, the first resource and thesecond resource are a control resource set (CORESET) resource.Optionally, in the embodiment of the present application, the network device 600 further25 includes: a processing unit 620, configured to obtain the first resource, where the first resourceincludes the CORESET resource and a search space associated with the CORESET resource; andthe communication unit 610, specially configured to: send the reference signal on thefirst resource.Optionally, in the embodiment of the present application, a third resource is different30 from the first resource and the second resource, and where the third resource is a resourceused by the communication unit 610 for sending the second information.Optionally, in the embodiment of the present application, a first resource for sending thereference signal and a second resource for sending the first information by the communicationunit 610 are different.27Optionally, in the embodiment of the present application, a period of the first resourceis less than a period of the second resource.Optionally, in the embodiment of the present application, the network device 600 furtherincludes: a processing unit 620, configured to obtain configuration information of the referencesignal, where the configuration information of the reference 5 signal includes a generation modeof the reference signal and the first resource; andthe communication unit 610 is specially configured to: send the reference signal on thefirst resource.Optionally, in the embodiment of the present application, a parameter of the reference10 signal sent by the communication unit 610 at a starting position of the COT is different from aparameter of the reference signal sent at other position of the COT.Optionally, in the embodiment of the present application, the parameter of the referencesignal includes a sequence of the reference signal or a time-frequency resource position of thereference signal.15 Optionally, in the embodiment of the present application, the reference signal is any oneof a Preamble, a PSS, a SSS, a DMRS, a CSI-RS and a reference signal used for indicating the firstinformation.Optionally, in the embodiment of the present application, the network device 600 furtherincludes: a processing unit 620, configured to obtain a second resource, where the second20 resource includes a CORESET resource and a search space associated with the CORESETresource; andthe communication unit 610 is specially configured to: send the first information on thesecond resource.It should be understood that the network device 600 may correspond to the network25 device in the method 200, and may implement the corresponding operation of the networkdevice in the method 200, which will not be described here again for brevity.Fig. 16 illustrates a schematic block diagram of a network device 700 of an embodimentof the present application. As shown in Fig. 16, the network device 700 includes:a communication unit 710, configured to send a plurality of reference signals to a30 terminal device within COT, where the reference signals are used for indicating that thenetwork device has obtained the COT; and send second information used for indicating datareceiving or sending to the terminal device.Optionally, in the embodiment of the present application, the reference signals areperiodically distributed at different positions of the COT, and where the different positions28include a starting position of the COT.Optionally, in the embodiment of the present application, a parameter of the referencesignal sent by the communication unit 710 at a starting position of the COT is different from aparameter of the reference signal sent at other position of the COT.Optionally, in the embodiment of the present application, 5 the parameter of the referencesignal includes a sequence of the reference signal or a time-frequency resource position of thereference signal.Optionally, in the embodiment of the present application, a first resource used by thecommunication unit 710 for sending the reference signal is a control resource set (CORESET)10 resource.Optionally, in the embodiment of the present application, the network device 700 furtherincludes: a processing unit 720, configured to obtain the first resource, where the first resourceincludes the CORESET resource and a search space associated with the CORESET resource; andthe communication unit 710 is specially configured to: send a plurality of the reference15 signals on the first resource.Optionally, in the embodiment of the present application, the network device 700 furtherincludes: a processing unit 720, configured to obtain configuration information of the referencesignal, where the configuration information of the reference signal includes a generation modeof the reference signal and a first resource; and20 the communication unit 710 is specially configured to: send a plurality of the referencesignals on the first resource.Optionally, in the embodiment of the present application, a third resource used by thecommunication unit 710 for sending the second information is different from the first resource.Optionally, in the embodiment of the present application, a period of the first resource25 is less than a period of the third resource.Optionally, in the embodiment of the present application, the reference signal is any oneof a Preamble, a PSS, a SSS, a DMRS, and a CSI-RS.It should be understood that the network device 1300 may correspond to the networkdevice in the method 300, and may implement the corresponding operation of the network30 device in the method 300, which will not be described here again for brevity.Fig. 17 is a schematic block diagram of a communication device 800 provided by anembodiment of the present application. The communication device 800 as shown in Fig. 17includes a processor 810, which may call and run a computer program from a memory toimplement the method in the embodiment of the present application.29Optionally, as shown in Fig. 17, the communication device 800 may further include amemory 820. The processor 810 may call and run a computer program from the memory 820,to implement the method in the embodiment of the present application.The memory 820 may be a separate component independent of the processor 810, ormay be integrated in 5 the processor 810.Optionally, as shown in Fig. 17, the communication device 800 may further include atransceiver 830, and the processor 810 may control the transceiver 830 to communicate withother device, specifically, may send information or data to other device, or receive informationor data sent by other device.10 The transceiver 830 may include a transmitter and a receiver. The transceiver 830 mayfurther include an antenna, and the number of antenna may be one or more.Optionally, the communication device 800 may specifically be a terminal device of anembodiment of the present application, and the communication device 800 may implementthe corresponding process implemented by the terminal device in each method of the15 embodiment of the present application, which will not be described again for brevity.Optionally, the communication device 800 may specifically be a network device of anembodiment of the present application, and the communication device 1000 may implementthe corresponding process implemented by the network device in each method of theembodiment of the present application, which will not be described again for brevity.20 Fig. 18 is a schematic block diagram of a chip of an embodiment of the presentapplication. The chip 900 as shown in Fig. 18 includes a processor 910, which may call and runa computer program from a memory to implement the method in the embodiment of thepresent application.Optionally, as shown in Fig. 18, the chip 900 may further include a memory 920. The25 processor 910 may call and run a computer program from the memory 920 to implement themethod in the embodiment of the present application.The memory 920 may be a separate component independent of the processor 910, ormay be integrated in the processor 910.Optionally, the chip 900 may further include an input interface 930. The processor 91030 may control the input interface 930 to communicate with other device or chip, specifically, mayobtain information or data sent by other device or chip.Optionally, the chip 900 may further include an output interface 940. The processor 910may control the output interface 940 to communicate with other device or chip, specifically,may output information or data to other device or chip.30Optionally, the chip may be applied to the terminal device in the embodiment of thepresent application, and the chip may implement the corresponding process implemented bythe terminal device in each method of the embodiment of the present application, which willnot be described again for brevity.Optionally, the chip may be applied to the network 5 device in the embodiment of thepresent application, and the chip may implement the corresponding process implemented bythe network device in each method of the embodiment of the present application, which willnot be described again for brevity.It should be understood that the chip mentioned in the embodiment of the present10 application may also be referred to as a system-level chip, a system chip, a chip system, or asystem-on-chip, etc.It should be understood that the processor of the embodiments of the presentapplication may be an integrated circuit chip with signal processing capability. In theimplementation process, each step of the above method embodiments may be completed by15 hard ware integrated logic circuits in the processor or instructions in the form of software. Theabove processor may be a general-purpose processor, a digital signal processor (DSP), anapplication specific integrated circuit (ASIC), a field programmable gate array (FPGA) or otherprogrammable logic parts, discrete gates or transistor logic parts, discrete hardwarecomponents. Each method, step and logic block diagram disclosed in the embodiments of the20 present application may be implemented or executed. The general-purpose processor may bea microprocessor, or the processor may also be any conventional processor or the like. Thesteps of the method disclosed in combination with the embodiments of the present applicationmay be directly reflected as the execution by a hardware decoding processor, or by acombination of hardware and software modules in the decoding processor. The software25 module may be located in a mature storage medium of the art, such as a random accessmemory, a flash memory, a read-only memory, a programmable read-only memory or anelectrically erasable programmable memory, a register, etc. The storage medium is located inthe memory, and the processor reads information in the memory and completes the steps ofthe above method in combination with its hardware.30 It can be understood that the memory in the embodiments of the present applicationmay be a volatile memory or a non-volatile memory, or may include both volatile and nonvolatilememories. The non-volatile memory may be a Read-Only Memory (ROM), aProgrammable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM) ora flash memory. The non-volatile memory may be a Random Access Memory (RAM) which31serves as an external cache. By way of exemplary but not restrictive description, many formsof RAM are available, such as a Static RAM (SRAM), a Dynamic RAM (DRAM), a SynchronousDRAM (SDRAM), a Double Data Rate SDRAM (DDR SDRAM), an Enhanced SDRAM (ESDRAM), aSynch link DRAM (SLDRAM) and a Direct Rambus RAM (DR RAM). It should be noted that thememories of the system and method described herein are intended 5 to include, but are notlimited to these and any other suitable types of memories.It should be understood that the above memory is exemplary but not limited restrictive,for example, the memory of the embodiments of the present application may also be a staticRAM (SRAM), a dynamic RAM (DRAM), a synchronous DRAM (SDRAM), a double data rate10 SDRAM (DDR SDRAM), an enhanced SDRAM (ESDRAM), a synch link DRAM (SLDRAM) and aDirect Rambus RAM (DR RAM), etc. That is to say, the memories of the embodiments of thepresent application are intended to include, but are not limited to these and any other suitabletypes of memories.Fig. 19 is a schematic block diagram of a communication system 1000 provided by an15 embodiment of the present application. As shown in Fig. 10, the communication system 100includes a terminal device 1010 and a network device 1020.The terminal device 1010 may be applied to implement the corresponding functionsimplemented by the terminal device in the above method, and the network device 1020 maybe applied to implement the corresponding functions implemented by the network device in20 the above method, which will not be described here again for brevity.The embodiment of the present application also provides a computer-readable storagemedium configured to store a computer program.Optionally, the computer-readable storage medium may be applied to the terminaldevice in the embodiment of the present application, and the computer program enables the25 computer to perform the corresponding process implemented by the first terminal device orthe second terminal device in each method of the embodiment of the present application,which will not be described here again for brevity.Optionally, the computer-readable storage medium may be applied to the networkdevice in the embodiments of the present application, and the computer program enables the30 computer to perform the corresponding process implemented by the network device in eachmethod of the embodiment of the present application, which will not be described here againfor brevity.The embodiment of the present application also provides a computer program productincluding computer program instructions.32Optionally, the computer program product may be applied to the terminal device in theembodiments of the present application, and the computer program instruction enables thecomputer to perform the corresponding process implemented by the first terminal device orthe second terminal device in each method of the embodiment of the present application,which will not be described 5 here again for brevity.Optionally, the computer program product may be applied to the network device in theembodiments of the present application, and the computer program instruction enables thecomputer to perform the corresponding process implemented by the network device in eachmethod of the embodiment of the present application, which will not be described here again10 for brevity.The embodiment of the present application also provides a computer program.Optionally, the computer program may be applied to the terminal device in theembodiments of the present application, and when the computer program runs on thecomputer, the computer is caused to perform the corresponding process implemented by the15 first terminal device or the second terminal device in each method of the embodiment of thepresent application, which will not be described here again for brevity.Optionally, the computer program may be applied to the network device in theembodiments of the present application, and when the computer program runs on thecomputer, the computer is caused to perform the corresponding process implemented by the20 network device in each method of the embodiment of the present application, which will notbe described here again for brevityThose of ordinary skill in the art can be aware that the unit and algorithm step of eachexample described in conjunction with the embodiments disclosed herein may beimplemented by electronic hardware, or a combination of computer software and electronic25 hardware. Whether these functions are executed in the form of hardware or software dependson the specific application and design constraints of the technical solution. Professionals andtechnicians may use different methods for each specific application to implement the describedfunction, but such implementation should not be considered beyond the scope of the presentapplication.30 Those skilled in the art can clearly understand that, for the convenience and concisenessof the description, the specific working process of the system, apparatus and unit describedabove may refer to the corresponding process in the aforementioned method embodiments,which will not be described here again.In the several embodiments provided by the present application, it should be understood33that the disclosed system, apparatus and method may be implemented in other manners. Forexample, the apparatus embodiment described above is merely exemplary. For example, thedivision of the units is merely one kind of logical function division, and there may be otherdivision manners in actual implementation. For example, multiple units or components may becombined or integrated in another system, or some features may 5 be ignored or not executed.On the other hand, the mutual coupling or direct coupling or communication connection shownor discussed may be indirect coupling or communication connection through some interfaces,apparatus or units, and may be in electrical, mechanical or other forms.The unit described as a separate component may or may not be physically separated,10 and the component displayed as a unit may or may not be a physical unit, that is, it may belocated in one place, or may be distributed on multiple network units. Some or all of the unitsmay be selected according to actual needs to achieve the objectives of the solutions of theembodiments.In addition, each functional unit in each embodiment of the present application may be15 integrated in one processing unit, or each unit may exist alone physically, or two or more aboveunits may be integrated in one unit.The functions may also be stored in a computer-readable storage medium if beingimplemented in the form of a software functional unit and sold or used as an independentproduct. Based on such understanding, the essence of the technical solution of the present20 application or the part contributing to the prior art or part of the technical solution may beembodied in the form of a software product, and the computer software product is stored in astorage medium including several instructions such that a computer device (which may be apersonal computer, a server, or a network device, etc.) executes all or part of the steps of themethod described in each embodiment of the present application. The aforementioned25 storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a randomaccess memory (RAM), a magnetic disk or an optical disk and other mediums that can storeprogram codes.The foregoing descriptions are merely specific implementations of the embodiments ofthe present application, and the protection scope of the embodiments of the present30 application is not limited thereto. Any person skilled in the art can easily think of changes orsubstitutions within the technical scope disclosed in the present application, and all thechanges or substitutions should be covered in the protection scope of the present application.Therefore, the protection scope of the present application should be subject to the protectionscope of the claims.

Claims

We Claim:

1. A communication method for unlicensed spectrum, wherein the method comprises:detecting, by a terminal device, a reference signal, wherein the reference signal is usedfor indicating that a network device has obtained Channel Occupancy Time (COT); anddetecting, by the terminal device, second information used 5 for indicating data receivingor sending within the COT, after the reference signal has been detected;wherein there are a plurality of the reference signals within the COT.

2. The method according to claim 21, wherein the reference signal is periodicallydistributed at different positions of the COT, and wherein the different positions comprise a10 starting position of the COT.

3. The method according to claim 21 or 22, wherein detecting, by the terminal device, thesecond information used for indicating data receiving or sending within the COT, after thereference signal has been detected comprises:detecting, by the terminal device, the second information, based on a parameter of the15 reference signal.

4. The method according to claim 23, wherein the parameter of the reference signalcomprises a sequence of the reference signal or a time-frequency resource position of the5. The method according to any one of claims 21 to 24, wherein a first resource used by20 the terminal device for detecting the reference signal is a control resource set (CORESET)resource.

6. The method according to claim 25, wherein the detecting, by the terminal device, thereference signal comprises:obtaining, by the terminal device, the first resource, wherein the first resource comprises25 the CORESET resource and a search space associated with the CORESET resource; anddetecting, by the terminal device, the reference signal, on the first resource.

7. The method according to any one of claims 21 to 24, wherein the detecting, by theterminal device, the reference signal comprises:obtaining, by the terminal device, configuration information of the reference signal,30 wherein the configuration information of the reference signal comprises a generation mode ofthe reference signal and a first resource; and358. The method according to any one of claims 25 to 27, wherein the terminal deviceobtains the first resource by means of a protocol agreement, a broadcast message or a RadioResource Control (RRC) dedicated signaling.

9. The method according to any one of claims 25 to 28, wherein a third resource used bythe terminal device for detecting the second information is different 5 from the first resource.

10. The method according to claim 29, wherein a period of the first resource is less thana period of the third resource.

11. The method according to any one of claims 21 to 30, wherein the reference signal isany one of a Random Access Preamble (Preamble), a Primary Synchronization Signal (PSS), a10 Secondary Synchronization Signal (SSS), a Demodulation Reference Signal (DMRS) and aChannel-State Information Reference Signal (CSI-RS).

12. A communication method for unlicensed spectrum, wherein the method comprises:sending, by a network device, a plurality of reference signals to a terminal device, withinChannel Occupancy Time (COT), wherein the reference signals are used for indicating that the15 network device has obtained the COT; andsending, by the network device, second information used for indicating data receiving orsending to the terminal device.

13. The method according to any one of claims 49 to 57, wherein the reference signal is20 Secondary Synchronization Signal (SSS), a Demodulation Reference Signal (DMRS) and a14. A terminal device, comprising:a memory and a processor, wherein the memory is configured to store a computerprogram, and the processor is configured to call and run the computer program stored in the25 memory to perform the method according to any one of claims 1 to 20.

15. A network device, comprising:memory to perform the method according to any one of claims 49 to 58.