CN110474752B

CN110474752B - Signal transmission method and device

Info

Publication number: CN110474752B
Application number: CN201810797873.8A
Authority: CN
Inventors: 吴霁; 张佳胤; 朱俊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-05-11
Filing date: 2018-07-19
Publication date: 2022-04-29
Anticipated expiration: 2038-07-19
Also published as: CN110474752A

Abstract

A signal transmission method, related equipment and a system are provided, wherein the method comprises the following steps: comprising performing LBT; after LBT is successful, the allowed mini-slot combination is transmitted on one or more time domain resources smaller than 1 slot.

Description

Signal transmission method and device

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a signal transmission method and apparatus.

Background

The device working in the unlicensed band can automatically detect whether the channel is idle and access the channel to work without authorization. In order to ensure coexistence and fairness with other devices operating in unlicensed frequency bands, the R13 version of 3GPP specifies a channel contention access mechanism using Listen Before Talk (LBT: Listen-Before-Talk).

An eNB operating in an unlicensed band may start LBT at any time, which may end at any time due to uncertainty in the presence and duration of interference generated by other systems. How to efficiently utilize the time domain resources after LBT success is a problem concerned by the present application.

Disclosure of Invention

The application provides a signal transmission method, which can be applied to uplink or downlink and comprises LBT; after LBT succeeds, sending an allowed mini-slot combination on one or more time domain resources smaller than 1 slot; the starting symbol position of each mini-slot in the allowed mini-slot combination is recorded as a first symbol position set. Preferably, each mini-slot includes a control resource set, CORESET, for carrying control signaling, where the control signaling includes: a first common control signaling for indicating configuration information of the MCOT; or other control signaling.

Preferably, the first set of symbol positions is one or more of the following sets of symbol positions: {1,3,7},{3,7,10},{3,7},{7, 10},{5,7,12},{5,7},{7,12}. In general, after the LBT is successful, it is also possible to send on one or more time domain resources of 14 symbols: a complete slot or other mini-slot combination, and the starting symbol position of each mini-slot of the other mini-slot combination is recorded as a second symbol position set; preferably, the second set of symbol positions is different from the first set of symbol positions. However, it is also possible that the second set of symbol positions is different from the first set of symbol positions. Preferably, the method further comprises: an indication of the start position of the maximum channel occupancy time MCOT is sent. It is possible to efficiently utilize communication resources and reduce processing complexity on the receiving side.

In other aspects, an apparatus capable of performing the method is provided, and in addition, a transmitting method and an apparatus on a receiving side are correspondingly provided.

On the other hand, the method only relates to the downlink, and comprises the following steps: after LBT is successful, sending a control resource set CORESET on one or more time domain resources smaller than 1 slot; the CORESET is positioned at a specified symbol position which allows carrying the CORESET; (101) and transmitting the data scheduled by the CORESET according to the CORESET (102). It is possible to efficiently utilize communication resources and reduce processing complexity on the receiving side.

Preferably, the symbol position allowed to carry CORESET is taken as a first symbol position set, and is one or more of the following symbol position sets: {1,3,7},{3,7,10},{3,7},{7, 10},{5,7,12},{5,7},{7,12}. When the first set of symbol positions is multiple, the method further comprises: an indication of a first set of symbol positions currently in use is sent. In addition, after the LBT is successful, other CORESET and data scheduled by the other CORESET can be sent on one or more complete slot time domain resources, and the symbol positions where the other CORESET are located are marked as a second symbol position set; preferably, the second set of symbol positions is different from the first set of symbol positions. Further, the second set of symbol positions is a set of standard specified symbol positions. In addition, the method may further include: an indication of a starting position for the MCOT is sent.

On the other hand, the application also provides a corresponding terminal side processing method, the CORESET is detected at the specified symbol position allowing to bear the CORESET, and the detection can not be carried out at other positions, so that the resources and the electricity are saved.

The application correspondingly provides a network side device, which comprises a device such as equipment or a single board and a terminal side device comprising a terminal, a chip or other possible devices.

In other aspects, a communication system is provided, the communication system comprising: network equipment and terminal, wherein: the network device may be the aforementioned network device. The terminal is the terminal described above.

In other aspects, a computer-readable storage medium is provided, which has stored thereon instructions, which, when run on a computer, cause the computer to perform the signal transmission method described above.

In other aspects, a computer program product containing instructions which, when run on a computer, cause the computer to perform the above-described signal transmission method is provided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

Fig. 1 is a schematic architecture diagram of a wireless communication system provided in the present application;

fig. 2 is a schematic hardware architecture diagram of a terminal device provided by an embodiment of the present application;

FIG. 3 is a hardware architecture diagram of a network device provided by an embodiment of the present application;

FIGS. 4A-4B are schematic diagrams of a Type A/Type B multi-carrier LBT mechanism to which the present application relates;

FIG. 5 is a schematic diagram of a slot frame structure in LTE compliant application;

FIG. 6 is a diagram of a frame structure of a coincidence NR minislot;

FIGS. 7a, 7b, 7c and 7d are simplified schematic diagrams of the process flow to which the present application relates;

fig. 8, 8a is a first example of a possible starting point corresponding to the incomplete slot scheduling supported by the NR-U communication system provided in the present application;

fig. 9 is a second example of a possible starting point corresponding to non-complete slot scheduling supported by the NR-U communication system provided in the present application;

fig. 10 is a functional block diagram of a wireless communication system, terminal and network device provided by the present application.

Detailed Description

The terminology used in the description of the embodiments section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.

Referring to fig. 1, fig. 1 illustrates a wireless communication system 100 to which the present application relates. The wireless communication system 100 may operate in a licensed frequency band and may also operate in an unlicensed frequency band. It will be appreciated that the use of unlicensed frequency bands may increase the system capacity of the wireless communication system 100. As shown in fig. 1, the wireless communication system 100 includes: one or more network devices (Base Station)101, such as a network device (e.g., a gNB), an eNodeB, or a WLAN access point, one or more terminals (terminals) 103, and a core network 115. Wherein:

the network device 101 may be used to communicate with the terminal 103 under the control of a network device controller, such as a base station controller (not shown). In some embodiments, the network device controller may be part of the core network 115 or may be integrated into the network device 101.

The network device 101 may be configured to transmit control information (control information) or user data (user data) to the core network 115 via a backhaul (e.g., an S1 interface) 113.

Network device 101 may communicate wirelessly with terminal 103 through one or more antennas. Each network device 101 may provide communication coverage for a respective coverage area 107. The coverage area 107 corresponding to the access point may be divided into a plurality of sectors (sectors), wherein one sector corresponds to a portion of the coverage area (not shown).

The network device 101 and the network device 101 may also communicate with each other directly or indirectly through a backhaul (blackhaul) link 211. Here, the backhaul link 111 may be a wired communication connection or a wireless communication connection.

In some embodiments of the present application, network device 101 may include: a Base Transceiver Station (Base Transceiver Station), a wireless Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a NodeB, eNodeB, a network device (e.g., gNB), and so on. The wireless communication system 100 may include several different types of network devices 101, such as macro base stations (macro base stations), micro base stations (micro base stations), and so on. Network device 101 may apply different radio technologies, such as a cell radio access technology, or a WLAN radio access technology.

The terminals 103 may be distributed throughout the wireless communication system 100 and may be stationary or mobile. In some embodiments of the present application, the terminal 103 may include: mobile devices, mobile stations (mobile stations), mobile units (mobile units), wireless units, remote units, user agents, mobile clients, and the like. In the present application, a terminal may also be understood as a terminal device.

In this application, the wireless communication system 100 may be an LTE communication system capable of operating in an unlicensed frequency band, such as an LTE-U system, a new air interface communication system capable of operating in an unlicensed frequency band, such as an NRU system, or another communication system capable of operating in an unlicensed frequency band in the future.

Additionally, the wireless communication system 100 may also include a WiFi network.

Referring to fig. 2, fig. 2 illustrates a terminal 300 provided by some embodiments of the present application. As shown in fig. 2, the terminal 300 may include: input-output modules (including audio input-output module 318, key input module 316, and display 320, etc.), user interface 302, one or more terminal processors 304, transmitter 306, receiver 308, coupler 310, antenna 314, and memory 312. These components may be connected by a bus or other means, with fig. 2 exemplified by a bus connection. Wherein:

communication interface 301 may be used for terminal 300 to communicate with other communication devices, such as base stations. Specifically, the base station may be the network device 400 shown in fig. 3. The communication interface 301 refers to an interface between the terminal processor 304 and a transceiving system (composed of the transmitter 306 and the receiver 308), for example, an X1 interface in LTE. In a specific implementation, the communication interface 301 may include: one or more of a Global System for Mobile Communication (GSM) (2G) Communication interface, a Wideband Code Division Multiple Access (WCDMA) (3G) Communication interface, and a Long Term Evolution (LTE) (4G) Communication interface, and the like, and may also be a Communication interface of 4.5G, 5G, or a future new air interface. The terminal 300 may be configured with a wired communication interface 301, such as a Local Access Network (LAN) interface, without being limited to a wireless communication interface.

The antenna 314 may be used to convert electromagnetic energy in the transmission line to electromagnetic energy in free space or vice versa. The coupler 310 is used to split the mobile communication signal received by the antenna 314 into multiple paths for distribution to the plurality of receivers 308.

The transmitter 306 may be configured to perform transmit processing on the signal output by the terminal processor 304, such as modulating the signal in a licensed frequency band or modulating the signal in an unlicensed frequency band.

Receiver 308 may be used for receive processing of mobile communication signals received by antenna 314. For example, the receiver 308 may demodulate a received signal modulated on an unlicensed frequency band, and may also demodulate a received signal modulated on a licensed frequency band.

In some embodiments of the present application, the transmitter 306 and the receiver 308 may be considered to be one wireless modem. In the terminal 300, the number of the transmitters 306 and the receivers 308 may be one or more.

In addition to the transmitter 306 and receiver 308 shown in fig. 2, the terminal 300 may also include other communication components, such as a GPS module, a Bluetooth (Bluetooth) module, a Wireless Fidelity (Wi-Fi) module, and so forth. Not limited to the above-described wireless communication signals, the terminal 300 may also support other wireless communication signals, such as satellite signals, short-wave signals, and so forth. Not limited to wireless communication, the terminal 300 may also be configured with a wired network interface (e.g., a LAN interface) to support wired communication.

The input and output module may be used to enable interaction between the terminal 300 and a user/external environment, and may mainly include an audio input and output module 318, a key input module 316, a display 320, and the like. In a specific implementation, the input/output module may further include: cameras, touch screens, sensors, and the like. Wherein the input output modules are in communication with a terminal processor 304 through a user interface 302.

Memory 312 is coupled to terminal processor 304 for storing various software programs and/or sets of instructions. In particular implementations, memory 312 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state storage devices. The memory 312 may store an operating system (hereinafter referred to simply as a system), such as an embedded operating system like ANDROID, IOS, WINDOWS, or LINUX. The memory 312 may also store a network communication program that may be used to communicate with one or more additional devices, one or more terminal devices, one or more network devices. The memory 312 may further store a user interface program, which may vividly display the content of the application program through a graphical operation interface, and receive a control operation of the application program from a user through input controls such as menus, dialog boxes, and buttons.

In some embodiments of the present application, the memory 312 may be used to store an implementation program of the signal transmission method provided in one or more embodiments of the present application on the terminal 300 side. For the implementation of the signal transmission method provided in one or more embodiments of the present application, please refer to the following embodiments.

The terminal processor 304 is operable to read and execute computer readable instructions. Specifically, the terminal processor 304 may be configured to call a program stored in the memory 312, for example, a program implemented on the terminal 300 side by the signal transmission method provided in one or more embodiments of the present application, and execute instructions contained in the program.

It is to be appreciated that the terminal 300 can be the terminal 103 in the wireless communication system 100 shown in fig. 1 and can be implemented as a mobile device, a mobile station (mobile station), a mobile unit (mobile unit), a wireless unit, a remote unit, a user agent, a mobile client, and the like.

It should be noted that the terminal 300 shown in fig. 2 is only one implementation manner of the present application, and in practical applications, the terminal 300 may further include more or less components, and is not limited herein.

Referring to fig. 3, fig. 3 illustrates a network device 400 provided by some embodiments of the present application. As shown in fig. 3, network device 400 may include: a communication interface 403, one or more base station processors 401, a transmitter 407, a receiver 409, a coupler 411, an antenna 413, and a memory 405. These components may be connected by a bus or other means, with fig. 3 exemplified by a bus connection. Wherein:

communication interface 403 may be used for network device 400 to communicate with other communication devices, such as terminal devices or other base stations. Specifically, the terminal device may be the terminal 300 shown in fig. 2. The communication interface 301 refers to an interface between the base station processor 401 and a transceiving system (composed of the transmitter 407 and the receiver 409), for example, an S1 interface in LTE. In a specific implementation, the communication interface 403 may include: one or more of a global system for mobile communications (GSM) (2G) communication interface, a Wideband Code Division Multiple Access (WCDMA) (3G) communication interface, and a Long Term Evolution (LTE) (4G) communication interface, etc., and may also be a communication interface of 4.5G, 5G, or a future new air interface. Not limited to wireless communication interfaces, network device 400 may also be configured with a wired communication interface 403 to support wired communication, e.g., a backhaul link between one network device 400 and other network devices 400 may be a wired communication connection.

The antenna 413 may be used to convert electromagnetic energy in the transmission line into electromagnetic waves in free space, or vice versa. Coupler 411 may be used to multiplex the mobile communications signal to a plurality of receivers 409.

The transmitter 407 may be configured to perform transmission processing on the signal output by the bs processor 401, such as modulating the signal in a licensed frequency band or modulating the signal in an unlicensed frequency band.

Receiver 409 may be used for receive processing of mobile communication signals received by antenna 413. For example, the receiver 409 may demodulate a received signal modulated on an unlicensed frequency band, and may also demodulate a received signal modulated on a licensed frequency band.

In some embodiments of the present application, the transmitter 407 and the receiver 409 may be considered as one wireless modem. In the network device 400, the number of the transmitters 407 and the receivers 409 may be one or more.

Memory 405 is coupled to the base station processor 401 for storing various software programs and/or sets of instructions. In particular implementations, memory 405 may include high speed random access memory and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid state storage devices. The memory 405 may store an operating system (hereinafter, referred to as a system), such as an embedded operating system like uCOS, VxWorks, RTLinux, or the like. Memory 405 may also store network communication programs that may be used to communicate with one or more additional devices, one or more terminal devices, one or more network devices.

The base station processor 401 may be used to perform radio channel management, implement call and communication link setup and teardown, control handover for user equipment within the control area, and the like. In a specific implementation, the base station processor 401 may include: an Administration/Communication Module (AM/CM) (a center for voice channel switching and information switching), a Basic Module (BM) (for performing call processing, signaling processing, radio resource management, management of radio links, and circuit maintenance functions), a code conversion and sub-multiplexing unit (TCSM) (for performing multiplexing/demultiplexing and code conversion functions), and so on.

In the present application, the base station processor 401 may be configured to read and execute computer readable instructions. Specifically, the base station processor 401 may be configured to call a program stored in the memory 405, for example, an implementation program of the signal transmission method provided in one or more embodiments of the present application on the network device 400 side, and execute instructions contained in the program.

It is understood that the network device 400 may be the network device 101 in the wireless communication system 100 shown in fig. 1, and may be implemented as a base transceiver station, a wireless transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a NodeB, an eNodeB, and so on. The network device 400 may be implemented as several different types of base stations, such as macro base stations, micro base stations, etc. Network device 400 may apply different radio technologies, such as a cell radio access technology, or a WLAN radio access technology.

It should be noted that the network device 400 shown in fig. 3 is only one implementation manner of the present application, and in practical applications, the network device 400 may also include more or less components, which is not limited herein.

In order to ensure coexistence with other devices operating in unlicensed frequency bands, the NRU system employs the channel contention access mechanism of LBT, and the procedures and parameters of LBT are specified in release R13 of 3 GPP. Fig. 4A-4B illustrate two types of LBT listening mechanisms.

As shown in fig. 4A, a type a (type a) LBT device may perform independent backoff on multiple Component Carriers (CCs), and delay transmission to wait for other component carriers still in backoff after backoff on a certain carrier is completed. When all carriers performing LBT complete backoff, the device needs to make an additional one-shot CCA (25us clear channel assignment) to ensure that all carriers are idle; if all carriers are idle, the eNB transmits simultaneously on the idle carrier.

As shown in fig. 4B, the type B (type B) LBT device performs backoff only on a certain selected component carrier, performs one-shot CCA (25us clear channel assessment) review on other component carriers when backoff is finished, and performs data transmission if the component carrier is idle; if the component carrier is not idle, the component carrier cannot be transmitted with data at this time.

As shown in fig. 4A-4B, the LBT device may be LTE LAA, WiFi, NRU or other communication devices operating in unlicensed (unlicensed) frequency band. In the figure, interference received by the device performing LBT comes from a WiFi system, and in an actual scenario, the interference received by the device performing LBT may also come from LTE LAA, NRU or other communication systems operating in an unlicensed frequency band, which is not limited in this application.

Without being limited to the embodiments shown in fig. 4A-4B, the LBT listening mechanism employed by the NR U system may also be changed without affecting the implementation of the present application.

The frame structure applied in the present application may be a frame structure of LTE or its evolution versions. For example, as shown in fig. 5, a typical frame structure specified in LTE includes 14 OFDM symbols (hereinafter, referred to as symbols) in one scheduling slot (slot), where the first 1,2, or 3 symbols carry control information (DCI), and the last 11, 12, or-13 symbols carry data. In the new air interface NR, in order to improve flexibility of system scheduling, a micro-scheduling slot (mini-slot) is introduced, and the length of the micro-scheduling slot may be 2,4, or 7 OFDM symbols. In the example shown in FIG. 6, the 1 slot includes 3 mini-slots of 4 symbols and 1 mini-slot of 2 symbols. Of course, other mini-slot combinations are also possible. In each mini-slot, the control resource set (CORESET) of the mini-slot is carried on the first n symbols from the 1 st symbol, and is used for carrying the scheduling information (DCI) of the mini-slot. Specifically, n is a natural number and is smaller than the number of symbols in the mini-slot. Preferably, n is not more than 3.

Based on the foregoing embodiments corresponding to the wireless communication system 100, the terminal 300, and the network device 400, the present application provides a signal transmission method, which provides a technical scheme for sending a control resource set and corresponding data on a time domain resource after LBT is successful, and provides a technical scheme for performing detection on a receiving side.

Referring to fig. 7a, on the transmitting side, the transmitting side may be an uplink or a downlink, and mainly includes:

101a for LBT. Specifically, the UE may be a network device, or a user equipment UE

102a, after LBT succeeds, sending an allowed mini-slot combination on one or more time domain resources smaller than 1 slot; the starting symbol position of each mini-slot in the allowed mini-slot combination is recorded as a first symbol position set.

In general, after the LBT is successful, it is also possible to send on one or more time domain resources of 14 symbols: a complete slot or other mini-slot combination, and the starting symbol position of each mini-slot of the other mini-slot combination is recorded as a second symbol position set; preferably, the second set of symbol positions is different from the first set of symbol positions. Optionally, the duration of the last incomplete slot of the uplink transmission resource configured by the UE is less than 14 symbols, where the incomplete slot includes multiple mini-slots, and a symbol position where each mini-slot starts is recorded as a third symbol position set.

Specifically, according to the mini-slot structure described later, for downlink transmission, the embodiment of the present invention can also be described as follows:

101b, configuring a control resource set (CORESET); wherein, for time domain resources smaller than 1 slot, the control resource set (CORESET) is located at a specified symbol position which may (allows) carry CORESET. The symbol positions that are allowed to carry CORESET may be specified by the standard.

102b, after the LBT is successful, sending one or more control signaling carried in the CORESET.

The time domain resource smaller than 1 slot may be referred to as a non-complete slot (non-slot) compared to a complete slot. In a Maximum Channel Occupancy Time (MCOT for short) after LBT is successful, one or more complete slots may also be included. MCOT is the maximum channel occupancy time, i.e. the longest duration for a device to operate to occupy a channel for transmission after LBT is successful. For convenience of description, a time domain resource smaller than 14 symbols (incomplete slot) in the MCOT, which is located at the starting position and opposite to the slot boundary, is subsequently referred to as a first time domain resource, and one or more time domain resources (complete slot) with a length of 14 symbols opposite to the slot boundary are referred to as a second time domain resource; the incomplete slot located one at the end position in the MCOT is subsequently referred to as a third time domain resource.

In addition, after the LBT is successful, other CORESET and data scheduled by the other CORESET may be sent on one or more complete slots of time-domain resources, and a symbol position where the other CORESET is located is recorded as a second symbol position set.

The CORESET comprises a common search space and a UE-specific search space. The common search space is used for bearing common control signaling and/or UE-specific control signaling, and the UE-specific search space is used for bearing UE-specific control signaling.

Optionally, the common control signaling includes a first common control signaling, where the first common control signaling is used to indicate configuration information of the MCOT, for example, a remaining duration of the MCOT or uplink and downlink configuration of the MCOT. Alternatively, it can be understood that the first common control signaling is used to indicate configuration information of a Channel Occupancy Time (COT), where the COT refers to a Time that the device LBT can occupy a Channel for transmission after success, and may be configured by the network side through the control signaling, and in the foregoing embodiment, the Time is referred to as an MCOT remaining duration.

Optionally, the common control signaling includes a second common control signaling, where the second common control signaling is used to indicate that the current timeslot belongs to the first time domain resource, and the second time domain resource is also a MCOT tail portion timeslot (referred to as a third time domain resource).

Optionally, the common control signaling includes a third common control signaling, where the third common control signaling is used to indicate whether the current timeslot belongs to a third time domain resource.

Optionally, the common control signaling includes a fourth common control signaling, where the fourth common control signaling is used to indicate a CORESET location of a next configuration.

Specifically, the standard may define one of the above common control signaling, that is, the symbol position set where the CORESET is located may be efficiently indicated, so as to reduce the blind detection overhead of the UE.

Note that the present application relates only to the transmission scheme in the time domain (i.e., symbol) and does not relate to the transmission scheme in the frequency domain. In the frequency domain, the CORESET may also be located on a part of the subbands, and the called symbol position may be the same symbol position as the CORESET, and then, data is transmitted on other subbands at the same symbol position; the symbol position of the data called by the control signaling carried on the CORESET may also be a symbol position after the CORESET.

The symbol positions specified by the above standard for the first time domain resource that are allowed to carry control information are subsequently referred to as a first set of symbol positions.

The symbol position, symbol index, or symbol number, etc. are substantially the same. For convenience of description, the symbol position is taken as an example, and is not described in detail later.

Accordingly, the receiver side,

201a, receiving the signal, and,

202a, processing the received signal according to an allowed mini-slot combination at least on one or more time domain resources smaller than 1 slot; the starting symbol position of each mini-slot in the allowed mini-slot combination is recorded as a first symbol position set.

Generally, the method further comprises: and receiving a complete slot or other mini-slot combination on one or more 14-symbol time domain resources, wherein the starting symbol position of each mini-slot of the other mini-slot combination is recorded as a second symbol position set. Preferably, the second set of symbol positions is different from the first set of symbol positions, although the same may be true.

The following behavior example, for example, the UE or other apparatuses are the receiving side, and referring to fig. 7, in this embodiment, the following behavior example includes:

201b, detecting whether there is control signaling on

symbols

0 or 0,1 and 2 in the slot. The method comprises the following steps: common control signaling and/or UE-specific control signaling of the common search space and UE-specific control signaling carried in a control resource set (CORESET UE-specific search space);

202b, detecting whether there is control signaling (202) in time domain resources smaller than 1 slot at least on n consecutive symbols from each symbol in the first set of symbol positions when the control signaling is not retrieved on symbol 0 or

symbol

0,1 or

symbols

0,1 and 2, n being 1 or 2 or 3. For example, common control signaling and/or UE-specific control signaling for the common search space and UE-specific control signaling carried in the control resource set CORESET UE-specific search space. That is, the control signaling detection is performed on at least the first set of symbol positions on the first time domain resource.

In addition, after the LBT is successful, other CORESET and data scheduled by the other CORESET may be sent on one or more complete slot time domain resources, and a symbol position where the other CORESET is located is recorded as a second symbol position set;

in a specific detection procedure, generally, the symbols in the union of the first symbol position set and the second symbol position set are sequentially detected. Preferably, if any one of the first, second, third and fourth common control signaling is sent in the embodiment, the detection overhead can be reduced to some extent.

Taking the first set of symbol positions {1,3,7} and the second set of symbol positions {0} as an example, the "sequential detection" procedure includes:

the UE first tries to detect the control signaling at symbol 0 (slot boundary), if the control signaling is not detected, the UE jumps to symbol 1 to continue the detection, if symbol 1 is not detected yet, the UE jumps to symbol 3 to detect again, if symbol 3 is not detected yet, the UE does not blindly detect the control signaling at other symbols to save energy.

If the first common control signaling is detected in symbol 0, according to the remaining duration of the MCOT or COT carried by the first common control signaling, determining a second time domain resource and/or a third time domain resource (at this time, the first time domain resource is not possible) within the duration of the MCOT or COT, and detecting according to the corresponding CORESET symbol position set in the corresponding time domain resource position.

Specifically, for the detection of the second time domain resource, the first symbol position set is not involved, and the detection is not required to be performed on the first symbol position set {1,3,7 }; the detection may be performed according to a correlation criterion or may be performed using the second set of symbol positions in other embodiments in this application. For the third time domain resource, detection needs to be performed according to the union set of the CORESET symbol position sets corresponding to the first and second time domain resources. And will not be described in detail later.

Alternatively, if the second common control signaling is detected at symbol 0, the control signaling is detected according to the symbol position sets corresponding to the time domain resources in which the current time slot is located, where the symbol position sets are used to indicate that the current time slot belongs to the second time domain resource or the third time domain resource, and the second common control signaling is carried by the second common control signaling.

Alternatively, if the third common control signaling is detected at symbol 0, judging whether the current time slot belongs to a third time domain resource according to the third common control signaling, and if the current time slot belongs to the third time domain resource, detecting according to a union set of CORESET symbol position sets corresponding to the first time domain resource and the second time domain resource to monitor the control signaling; and if the first symbol position does not belong to the third time domain resource, detecting according to the second symbol position set.

Alternatively, if the fourth common control signaling is detected at symbol 0, the control signaling detection is performed at the symbol position where the next CORESET indicated by the fourth common control signaling is located.

Alternatively, if control signaling (e.g. located in the third time domain resource) is detected on symbol 0, but none of the first, second, third and fourth common control signaling is detected, which is equivalent to no signaling contributing to subsequent CORESET monitoring, then detection is performed according to the union of the sets of CORESET symbol positions corresponding to the first time domain resource and the second time domain resource.

For the aforementioned method that if the detection is performed by jumping to symbol 1, the information of the time domain resource will be different similarly by using the aforementioned method on symbol 0 (the detections on

symbols

3 and 7 are similar to 1, and are not described again):

if the first common control signaling is detected in the symbol 1, judging a first time domain resource, a second time domain resource and/or a third time domain resource in the MCOT duration or the COT duration according to MCOT or COT related information carried by the first common control signaling, and detecting according to a corresponding CORESET symbol position set at a corresponding time domain resource position.

Alternatively, if the second common control signaling is detected in symbol 1, the control signaling is detected according to the symbol position sets corresponding to the time domain resources in which the current time slot is located, according to the information carried by the second common control signaling and used for indicating that the current time slot belongs to the first time domain resource or the third time domain resource.

Alternatively, if the third common control signaling is detected at symbol 1, whether the current time slot belongs to the third time domain resource is determined according to the third common control signaling. If the resource belongs to the third time domain resource, detecting according to the union set of CORESET symbol position sets corresponding to the first time domain resource and the second time domain resource to monitor the control signaling; and if the first symbol position does not belong to the third time domain resource, detecting according to the first symbol position set.

Alternatively, if the fourth common control signaling is detected at symbol 1, the control signaling detection is performed at the symbol position where the next CORESET indicated by the fourth common control signaling is located.

Alternatively, if control signaling (e.g. located in the third time domain resource) is detected on symbol 1, but none of the first, second, third and fourth common control signaling is detected, which is equivalent to no signaling contributing to subsequent CORESET monitoring, then detection is performed according to the union of the sets of CORESET symbol positions corresponding to the first and second time domain resources.

For the aforementioned process of detecting if jumping to symbol 3 or symbol 7, the aforementioned method on symbol 1 is similarly adopted, and will not be described again.

For example, the first symbol position set {0} is used as an example, and alternatively, the second symbol position set may have a plurality of symbols, and for the detection process on these symbols, the detection process is similar to the detection process of the symbol 0 in the foregoing example, and is not described again.

It should be noted that, when the second symbol position set and the first symbol position set have a common element I, the detection process for the element I is similar to the foregoing method. However, in the scheme for transmitting the first common control signaling, the determining the possibility of the time domain resource includes: any combination of the first time domain resource, the second time domain resource and the third time domain resource. In the scheme of sending the second common control signaling, the determining the possibility of the time domain resource includes: a first time domain resource, a second time domain resource, or a third time domain resource.

As mentioned above, for the second time domain resource indicated by each of the aforementioned common control signaling, the first symbol position set is not involved, and detection is not required to be performed on the first symbol position set {1,3,7 }; the detection may be performed according to a correlation criterion or may be performed using the second set of symbol positions in other embodiments in this application. For the third time domain resource, detection needs to be performed according to the union set of the CORESET symbol position sets corresponding to the first and second time domain resources. In this way, detection overhead can be saved, and the UE can reduce power consumption and increase service life.

The solutions provided in the present application are explained in detail below by means of various aspects or embodiments.

Frame structure on incomplete slots at the beginning or end of (a) MCOT or COT

In steps 101a and 102a, 101b and 102b, each mini-slot of the mini-slot combination transmitted on an incomplete slot follows a prescribed mini-slot structure. The standard specifies possible configurations of the mini-slots, e.g., lengths of 2,4 or 7, CORESET over the first n symbol positions in each mini-slot (n being less than the shorter of the mini-slot symbol length and 3). Other structures or details of the mini-slot can be continuously specified in the standard, and the implementation of the application can not be influenced.

In addition, each embodiment relates to only a frame structure in the time domain, and the transmission modes of mini-slots and slots in the frequency domain are not limited. For example, CORESET may be located only on a portion of the subbands of the first n symbols.

On the transmitting side (the downlink network side or the uplink terminal side), the method may further include:

100. optionally, one or more mini-slots to be sent are prepared, that is, one or more mini-slots are generated and buffered. This step may be performed in parallel with the process of LBT, or its timing is not affected by LBT. As long as there are enough mini-slots that can be sent when LBT succeeds, thus saving some communication latency.

In order to achieve efficient communication efficiency, after LBT succeeds, one or more mini-slots should be used to fill up all symbol positions after LBT succeeds and before the first complete slot starts, that is, from the 1 st symbol to the end of the first incomplete slot. Specifically, the filling is performed in a post-alignment manner, so that the start of the next complete slot structure can be ensured to the maximum extent. Therefore, the present embodiments provide a possible (allowed) mini-slot combination of post-alignment, that is, specifying the allowed CORESET position.

On the receiving side, it is preferable that whether or not there is control signaling is detected on n consecutive symbols from each symbol in the union of the first symbol position set and the second symbol position set based on n arranged in advance.

In a specific example, on the receiving side, whether the control signaling exists is detected on

symbols

0 or 0,1 and 2 in the time slot; (201) (ii) a

When the control signaling is not retrieved on symbol 0 or

symbols

0,1 and 2, detecting whether there is control signaling (202) on at least n consecutive symbols from each symbol in the first set of symbol positions in a time domain resource smaller than 1 slot, n being 1 or 2 or 3.

Before explaining the locations where the allowed CORESET is specified above, various possible mini-slot combinations on the incomplete slots and the corresponding CORESET symbol locations (at least the symbol locations that the UE should detect) are introduced.

The first type of mini-slot combination and the symbol position that should be detected at least:

the white symbol in the figure represents that the LBT is not passed at this time, and the device cannot transmit data in the symbol; the slash, horizontal line, gray, represent the mini-slots of different lengths, respectively. Referring to fig. 9, the gNB may support incomplete slot scheduling (non-slot based scheduling) for 7 different symbol starting points in total, wherein the mini-slots with maximum transmission lengths of 2,4, and 7 symbols are 1 each in a slot. The NR-U performs incomplete slot scheduling by using the above method, and all possibilities of a symbol position set in which the UE needs to detect DCI are listed as follows:

the NR-U supports incomplete slot scheduling with a symbol starting point of 1, and schedules 3 mini-slots with different lengths at most in the incomplete slot to transmit:

the gNB transmits a mini-slot of 2 symbols, 4 symbols and 7 symbols, and the UE shall perform DCI detection on the symbols {0,1,3,7} or {0,1,3,10} or {0,1,5,7} or {0,1,5,12} or {0,1,8,10}, or on the n symbols starting at the intersection of the above symbols, i.e. the symbols {0,1,3,5,7,8,10,12} (Alternative 1 in fig. 9).

Scheduling 1 mini-slot for sending in the incomplete slot by the NR-U:

the gNB sends a mini-slot of 2 symbols, and the UE shall perform DCI detection on the first n symbols of {0,12} (Alternative 7 in FIG. 9); or,

the gNB sends a 4-symbol mini-slot, and the UE shall perform DCI detection on the first n symbols of {0,10} (Alternative 6 in FIG. 9); or,

the gNB sends a mini-slot of 7 symbols and the UE shall perform DCI detection on the first n symbols of {0,7} (Alternative 4 in fig. 9).

Scheduling 2 mini-slots with different lengths at most in incomplete slots by NR-U for transmitting

The gNB sends a mini-slot of 4 symbols and 7 symbols, and the UE shall perform DCI detection on the initial n symbols of {0,3,7} or {0,3,10} symbols, or on the intersection of the two symbols, i.e. the initial n symbols of {0,3,7,10} (Alternative 2 in FIG. 9); or

The gNB sends a mini-slot of 2 symbols and 7 symbols, and the UE shall perform DCI detection on the n symbols starting from {0,5,7} or {0,5,12} or on the n symbols starting from the intersection of the two, i.e. symbols {0,5,7,12} (Alternative 3 in fig. 9); or

The gNB sends a mini-slot of 2 and 4 symbols, and the UE shall perform DCI detection on the first n symbols of {0,8,10} or {0,8,12} or on the intersection of the two, i.e. the first n symbols of {0,8,10,12} (Alternative 5 in fig. 9).

The second kind of mini-slot combination and the symbol position that should be detected at least:

with respect to the first category, the scheduling constraint is relaxed: when the gbb supports mini-slots 2 (at most 2 for each length) with length of 2,4,7 symbols in one slot, the gbb can additionally support 3 different starting positions in incomplete slot transmission, as shown in fig. 8.

When the method is adopted to schedule the NR-U in the incomplete slot, all possibilities of a symbol position set of the UE needing to detect the DCI are listed as follows:

1. the NR-U schedules 2 mini-slots with the same length in the incomplete slot for data transmission

The gNB transmits a mini-slot with 2 symbols, and the UE shall perform DCI detection on the first n symbols of {0,10,12 }.

The gNB transmits a mini-slot with 2 symbols and 4 symbols, and the UE shall perform DCI detection on the first n symbols of {0,6,10} (for example, Alternative 10 in FIG. 8).

The gNB transmits a mini-slot with 2 symbols and 7 symbols, and the UE should perform DCI detection on the first n symbols of {0,7 }.

2. The NR-U schedules 2 mini-slots with the same length and 1 mini-slot with different lengths in the incomplete slot to carry out data transmission

The gNB transmitted data includes 2 mini-slots of 2 symbols and 1 mini-slot of 4 symbols, and the UE should perform DCI detection on the first n symbols of {0,6,8,10} or {0,6,8,12} or {0,6,10,12} or on the intersection of the above symbols, i.e., the first n symbols of {0,6,8,10,12 }.

The gNB transmitted data includes 2 mini-slots of 2 symbols and 1 mini-slot of 7 symbols, and the UE should perform DCI detection on {0,3,5,7} or {0,3,5,12} or {0,3,10,12} or DCI detection on the n symbols starting from the symbol {0,3,5,7,10,12} which is the intersection of the above symbols.

The gNB transmitted data includes 2 mini-slots of 4 symbols and 1 mini-slot of 2 symbols, and the UE should perform DCI detection on {0,4,6,10} or {0,4,8,12}, or DCI detection on the n symbols starting from the intersection of the above symbols, i.e., the symbol {0,4,6,8,10,12} (see Alternative 9 in fig. 8).

3. Scheduling 4 mini-slots for data transmission by NR-U in incomplete slot

The gNB sends 2 symbols and 2 mini-slots of 4 symbols, and the UE should perform DCI detection on the first n symbols of {0,2,4,6,10} or {0,2,4,8,12} or {0,2,6,10,12} or {0,2,6,8,10}, or detect DCI at the intersection of the above symbols, i.e., symbol {0,2,4,6,8,10,12} (see Alternative 8 in fig. 8).

(II) with respect to the first set of symbol positions

The criterion may specify one or more of these, preferably partly based on (a) possible mini-slot combination(s), as the aforementioned first set of symbol positions. The implementation may differ:

on the network side:

101-1, the standard defines only one first set of symbol positions. That is, there is only one set of possible (allowed) combinations of mini-slots. Or, the standard directly defines the type, number and location of allowed mini-slots in the first time domain resource. It can also be understood that the CORESET of each mini-slot may be at the n symbol positions starting at which symbols in the slot where the first time domain resource is located.

101-2, the standard defines a plurality of first symbol position sets. That is, there are multiple sets of possible (allowed) combinations of mini-slots. In each first set of symbol positions, the possible symbol positions of the respective CORESET are not exactly the same. For example, any two or more symbol position sets in examples 1 to 7 described later.

Specifically, in the scheme of 101-2, the gNB may send an RRC or other signaling for explicitly or implicitly indicating, to the UE, a first symbol position set currently used by the network; in order for the UE to detect on the (configured) symbol position currently used by the network. Each first symbol position set may have its index, or may be indicated by using a bitmap, or may be multiplexed with other information by using other methods. Obviously, the above steps are not required in the scheme of 101. a.

For example, 1 bitmap (bitmap) of 14 bits is used for indicating, each bit corresponds to one OFDM symbol in the slot, a value of "1" of the bit indicates that the UE needs to perform DCI blind detection at the symbol position, a value of "0" indicates that the UE does not need to perform DCI blind detection at the symbol position, or vice versa, a value of "0" indicates that the UE needs to perform DCI blind detection at the symbol position, and a value of "1" indicates that the UE does not need to perform DCI blind detection at the symbol position.

For another example, when the first set of symbol positions is limited, for example, only 1 bit is needed to indicate the DCI blind detection configuration that the UE should use when NR-U supports only detection at position 0, but when NR-U supports only detection at

position

3,7 or {3,7,10 }.

Preferred first symbol position sets include, but are not limited to:

example 1, {1,3,7 }:

without CORESET on symbol 0, it is only possible to carry CORESET on

symbols

1,3, 7. That is, the receiving side can detect whether there is CORESET only on 4 symbols, which are 0,1,3, 7.

Example 2, {3,7,10 }:

without CORESET on symbol 0, it is only possible to carry CORESET on

symbols

3,7, 10. The meaning is not described in detail.

Example 3, {3,7 }:

without CORESET on symbol 0, it is only possible to carry CORESET on

symbol

3, 7.

Example 4, {7, 10 }:

without CORESET on symbol 0, it is only possible to carry CORESET on

symbol

7, 10.

Example 5, {5,7,12 }:

without CORESET on symbol 0, it is only possible to carry CORESET on

symbols

5,7, 12.

Example 6, {5,7 }:

without CORESET on symbol 0, it is only possible to carry CORESET on

symbols

5, 7;

example 7, {7,12 }:

without CORESET on symbol 0, it is only possible to carry CORESET on

symbol

7, 12.

In the above embodiment, the information to be sent is also carried in the incomplete slot after LBT is successful, so that resources can be efficiently utilized. On the other hand, compared with a scheme that the CORESET is possibly carried on each symbol in the incomplete slot, the transmission process can be simplified by specifying the positions of the symbols which can carry the CORESET, and accordingly, the complexity of blind detection of the CORESET at the receiving side can be simplified.

Frame structure on (III) complete slots

As mentioned in the schemes in the foregoing 101a-102a and 101b-102b, the MCOT after LBT success may include one or more time domain resources (14 symbols) with a full slot length. The complete 14 symbols can adopt the existing slot frame structure, and can also be the combination of a plurality of mini-slots.

Preferably, after the LBT is successful, sending other CORESET and data scheduled by the other CORESET on one or more complete slot time domain resources, and marking the symbol positions where the other CORESET is located as a second symbol position set; the second set of symbol positions is different from the first set of symbol positions.

NR (3GPP R15) specifies that the number of CORESET in a complete 1 slot is less than or equal to 3, and that CORESET can be transmitted at any location. Therefore, the scheduling of a slot for a global nb may probably send CORESET at symbol 0, whether or not CORESET is sent elsewhere, and the number of CORESETs are not determined. On the receiving side, the detection of CORESET should be performed at least at symbol 0. With the above scheme, the second symbol position set has only {0 }.

The complete slots in this embodiment follow the above specification, and there may be further optimized embodiments, for example, the standard may further specify a mini-slot combination (mini-slot) allowed in the complete slots for the unisense spectrum.

For example, the network device side may use 2 mini-slots of 7 symbols within a complete slot, i.e. it is only possible to carry CORESET on

symbols

0, 7. Alternatively, 3 mini-slots of 4 symbols and 1 mini-slot of 2 symbols may be used within a complete slot, i.e. it is only possible to carry CORESET on

symbol

0,7 or

symbol

0,2,6, 10. Accordingly, on the terminal side, CORESET detection should be performed at least on the

symbols

0,7 or on the

symbols

0,2,6, 10. The set of symbols is the second set of symbol positions for the complete slot.

The criteria may define 1, or 2 or more of the second set of symbol positions described above. When there are multiple types, the network device side may also send an indication of the current second symbol position set, so that the UE adopts the indicated second symbol position set for the complete slot.

(IV) other related information

Optionally, in the method of 101a to 102a and 101b to 102b, for the downlink, the method further includes: 103. information indicating (identifying) the starting position of the MCOT, for example, common information, may be transmitted to the UE after the LBT is successful. In a specific example, the MCOT start position is symbol position 0 in slot, and the foregoing embodiment only includes the second time domain resource. The common information may be a common reference signal, such as DMRS, or common control information, such as group common pdcch. Steps 102 and 101 have no precedence. The above-mentioned common information is not carried on the aforesaid CORESET.

Accordingly, in the method of the receiving side for the downlink, it is optional to receive 200 information for indicating (identifying) a start position of the MCOT. In connection with the schemes in 101a-102a, 101b-102b, control signaling detection is performed on a symbol that is in the union of the first set of symbol positions and the second set of symbol positions and that is located at or after the start position of the MCOT.

In another alternative embodiment, step 103 may not be included, and the receiving side should perform CORESET detection on the union of the first set of symbol positions and the second set of symbol positions. And the detection is not carried out at the symbol position outside the union set, so that on one hand, timely and accurate information acquisition is ensured, the detection complexity is reduced, and the loss is reduced.

The above information for indicating (identifying) the start position of the MCOT may be a sequence. And at the receiving side, the terminal firstly detects the sequence to obtain the starting position of the MCOT, and then carries out detection according to the first symbol position set and the second symbol position set.

To make the invention clearer, an upstream embodiment is provided with reference to fig. 7c and 7 d.

The 100gNB sends uplink transmission configuration information to the UE through RRC signaling and/or PDCCH, and the UE can transmit PUSCH in the configured time-frequency resource. Preferably, the uplink transmission configuration information includes: number of one or more slots information (14 OFDM symbols in full). Based on the start position of the COT, the time of successful LBT, and other conditions, when the configured time-frequency resource is available to the UE, the duration time in the time domain may be less than one or more slots configured above, that is, the time-frequency resource for the UE to perform uplink transmission may be less than 1 slot, or may be greater than or equal to 1 slot.

On the transmitting side (UE), the method mainly includes:

101c the UE performs LBT;

102c, after the LBT is successful, the UE sends an allowed mini-slot combination in the scheduled or configured uplink time domain resource (i.e. in the configured time domain resource, in the remaining time after the LBT is successful); the starting symbol position of each mini-slot in the allowed mini-slot combination is recorded as a first symbol position set.

Of course, based on whether the transmitted starting OFDM symbol is on the boundary of the slot, the UE may also transmit only the complete slot or slots, which is not described herein again for the transmission method that only transmits the complete slot.

Specifically, according to the mini-slot structure described later, referring to fig. 7d for uplink transmission, the embodiment of the present invention may also be described as follows:

101d, configuring Demodulation Reference Signal (DMRS) for uplink channel measurement; wherein, for time domain resources smaller than 1 slot, the DMRS is located at a specified symbol position of a possible (allowed) bearer. That is, the DMRS signal is carried on the OFDM symbol in each mini-slot that is allowed to carry the DMRS according to the mini-slot combination that allows transmission.

102d, after LBT succeeds, according to whether the initial position after LBT succeeds is at the slot boundary, sending a complete slot or one or more allowed mini-slot combinations.

Preferably, the PUSCH includes one or more mini-slots or slots, and the DMRS signal is carried on the first OFDM symbol of the mini-slots or slots.

The time domain resource smaller than 1 slot may be referred to as a non-complete slot (non-slot) compared to a complete slot. The UE may further include one or more complete slots in the uplink transmission timeslot after the LBT is successful. The duration that the UE allows the occupied channel for transmission after LBT success is configured by the gNB. For convenience of description, a time domain resource(s) of less than 14 symbols (incomplete slot) located at the starting position relative to the slot boundary in the uplink transmission slot is subsequently referred to as a first time domain resource, and one or more time domain resources (complete slot) having a length of 14 symbols relative to the slot boundary are referred to as a second time domain resource; the incomplete slot located at one of the last positions of the uplink transmission is subsequently referred to as a third time domain resource.

The above 102d includes but is not limited to:

102d-1, after the LBT is successful, one or more mini-slots including DMRS and uplink data are sent at the initial position.

102d-2, after the LBT succeeds, after one or more mini-slots of the starting position (or when the starting position after the LBT succeeds is at a slot boundary), the UE may further send the DMRS and the scheduled uplink data on one or more time domain resources of the complete slots, where a symbol position where the DMRS is located is recorded as a second symbol position set.

102d-3, after the LBT is successful, the UE may also send the DMRS and the scheduled uplink data in an incomplete slot at one of the tail positions of transmission, where a symbol position where the DMRS is located is recorded as a third symbol position set.

As described above, each embodiment relates only to the transmission method in the time domain (i.e., symbol) and does not relate to the transmission method in the frequency domain. In the frequency domain, the DMRS and the scheduled data may also be located on a portion of the subbands, as described above for DMRS and scheduled data transmitted on different subbands in the same time slot.

The prescribed symbol positions that the above standard allows to carry DMRS for the first time domain resource are subsequently referred to as a first set of symbol positions.

Accordingly, referring to fig. 7c, on the receive side (gNB),

201c, receiving signals

202c, processing the received signal according to an allowed mini-slot combination on one or more time domain resources smaller than 1 slot based on a result (successful time) of a UE LBT in a UE uplink transmission resource configured before the gNB; and recording the symbol position where the DMRS in the allowed mini-slot combination is located as a first symbol position set.

Optionally, the method further includes: and receiving a complete slot or other mini-slot combination on one or more 14-symbol time domain resources, wherein the symbol position of the DMRS of the other mini-slot combination is marked as a second symbol position set. Preferably, the second set of symbol positions is different from the first set of symbol positions, although the same may be true.

Optionally, the method further includes: and receiving a mini-slot combination on the last (or at the tail) time domain resource smaller than 14 symbols in the uplink transmission time slot, wherein the symbol position of the DMRS of the 'last' mini-slot combination is recorded as a third symbol position set. Preferably, the third set of symbol positions is different from both the first set of symbol positions and the second set of symbol positions, although the same may be true.

The above behavior example, for example, with the gNB as the receiving side, with reference to fig. 7d, includes in this embodiment:

201d, in a first slot in an uplink transmission slot configured by the gNB for the UE, if the time for successful LBT of the UE is within the slot, that is, when the starting position of uplink transmission of the UE is smaller than 14 symbols relative to the boundary of the slot, the gNB should perform DMRS detection on each symbol of the first symbol position set to determine a mini-slot combination used by the UE to send the PUSCH. When the starting position of UE uplink transmission is equal to 14 symbols relative to the boundary of the slot, the gNB performs DMRS detection on each symbol on the union set of the first symbol position set and the second symbol position set to determine the mini-slot/slot combination used by the UE for sending the PUSCH;

202d, in multiple slots in an uplink transmission slot configured by the gNB for the UE, if the starting position to the ending position of the uplink transmission after the successful UELBT includes (spans) two or more slot boundaries, when the gNB detects the DMRS in front of the second time domain resource, performing DMRS detection on each symbol of a second symbol position set of the second time domain resource to determine a mini-slot combination used by the UE to send the PUSCH; if the boundary of the ending position of uplink transmission after the UE lbt is successful relative to the slot is less than 14 symbols, the gNB may perform DMRS detection on each symbol of the first symbol position set or the third symbol position set of the slot to determine a mini-slot combination used by the UE to send the PUSCH. In a specific detection procedure, generally, the DMRS is sequentially detected on each symbol in the first symbol position set and/or the second symbol position set.

Taking the first set of symbol positions {1,3,7} and the second set of symbol positions {0} and the third set of symbol positions {0,2,6} as an example (as shown in fig. 2), the "sequential detection" procedure includes:

specifically, for the detection of the first time domain resource, (the union of the first symbol position set and the second symbol position set), the gNB first attempts to detect the DMRS at symbol 0, if no control signaling is detected, the gNB jumps to symbol 1 to continue the detection, if no control signaling is detected, the gNB jumps to symbol 3 to detect, if no control signaling is detected at symbol 1, the gNB jumps to symbol 7 to detect again, and the UE does not blindly detect the control signaling at other symbols to save energy.

Specifically, for the detection of the second time domain resource, the first symbol position set is not involved, and the detection is not required to be performed on the first symbol position set {1,3,7 }; detection may be performed according to a relevant criterion (e.g. detecting the first 1 or 2 or 3 OFDM symbols in a slot), or using a second set of symbol positions in other embodiments in this application. And will not be described in detail later.

Specifically, for the detection of the third time domain resource, the first symbol position set and the second symbol position set are not involved, and the detection on the symbol position sets is not needed; detection may be performed according to a relevant criterion, such as

symbol position

0,2,6, or with a third set of symbol positions in other embodiments in the application. And will not be described in detail later.

In the foregoing example, the second symbol position set {0} is taken as an example, and alternatively, the second symbol position set may also have a plurality of symbols or other symbol positions, and for the detection process on these symbols, the detection process is similar to the detection process of the symbol 0 in the foregoing example, and is not repeated.

It should be noted that the second set of symbol positions and the first set of symbol positions should not have the element I in common.

As mentioned before, for the aforementioned second time domain resource, which does not involve the first set of symbol positions, no detection need be performed on the first set of symbol positions {1,3,7 }; the detection may be performed according to a correlation criterion or may be performed using the second set of symbol positions in other embodiments in this application. As previously mentioned, for the aforementioned third time domain resource, which does not involve the first set of symbol positions and the second set of symbol positions, no detection need be performed on the first set of symbol positions {1,3,7} and the second set of symbol positions {0 }; detection may be performed according to relevant criteria or using a third set of symbol positions in other embodiments of the present application. Thus, detection overhead can be saved, and the UE can reduce power consumption and prolong the working time.

Frame structure on incomplete slots at the beginning or end of COT

In steps 101c and 102c, each mini-slot of the mini-slot combination transmitted on an incomplete slot follows a prescribed mini-slot structure. The standard specifies possible configurations of the mini-slot, e.g., lengths of 2,4 or 7; and the symbol position of the DMRS in each mini-slot (e.g., DMRS is always located at the first symbol of the mini-slot). Other structures or details of the mini-slot can be continuously specified in the standard, and the implementation of the application can not be influenced.

In addition, each embodiment relates to only a frame structure in the time domain, and the transmission modes of mini-slots and slots in the frequency domain are not limited. For example, the DMRS may be located only on a part of the sub-band of the first symbol of the mini-slot.

On the transmitting side (e.g., UE side), the foregoing method may further include:

100. optionally, after receiving the uplink transmission resource configured by the gNB, the UE may prepare one or more mini-slots to be sent, that is, generate and buffer one or more mini-slots. This step may be performed in parallel with the process of LBT, or its timing is not affected by LBT. As long as there are enough mini-slots that can be sent when LBT succeeds, thus saving some communication latency.

In order to achieve efficient communication efficiency, after LBT succeeds, one or more mini-slots should be used to fill up all symbol positions after LBT succeeds and before the first complete slot starts, that is, from the 1 st symbol to the end of the first incomplete slot. Specifically, the filling can be performed in a post-alignment manner, so that the start of the next complete slot structure can be ensured to the maximum extent. Therefore, the present embodiments provide possible (allowed) mini-slot combinations for post-alignment, that is, allowed DMRS symbol positions are specified.

On the receiving side, it is preferable that whether or not the DMRS is present is detected on each symbol in the union of the first symbol position set and/or the second symbol position set according to a pre-arrangement.

In a specific example, on the receiving side (e.g., a base station such as a gNB) 201c, whether or not there is a DMRS is detected on symbol 0 in the slot;

202c, detecting whether the DMRS is present on at least each symbol in the first set of symbol positions in a time domain resource of less than 1 slot when the DMRS is not retrieved on symbol 0 (202).

Before explaining the allowed DMRS positions specified above, various possible mini-slot combinations on non-complete slots and the corresponding DMRS symbol positions (at least the symbol positions that the gNB should detect) are introduced.

when the sequence generation of the DMRS is not related to the symbol position where the DMRS is located, or the DMRS sequence generation is related to the symbol position where the DMRS is located and the UE has strong capability, the UE can update the DMRS carried in the mini-slot according to the LBT state in real time, if the UE detects that the LBT fails in the symbol 1, the 4 symbols mini-slot which are prepared to be sent by the DMRS in the symbols 3-6 can be updated, if the LBT failure is still detected in the symbol 3, the UE can update the DMRS contained in the mini-slot, and when the UE does not detect that the LBT succeeds until the symbol 10, the UE can send the 4 symbols mini-slot containing the updated DMRS.

When the uplink transmission time slot configured for the UE by the gNB is one or more complete slots, the minislot combination sent in the aforementioned scheduled time slot after the LBT is successful by the UE is called a first-type mini-slot combination.

The white symbol in fig. 8a represents that LBT is not passed at this time, and the device cannot transmit data in the symbol; the slash, horizontal line and vertical line represent the mini-slots with different lengths respectively. Referring to fig. 8a, the UE transmits 1 mini-slots with 2,4, and 7 symbols at most in a slot, and the communication system may support non-complete slot scheduling (non-slot based scheduling) for 7 different symbol starting points altogether. By adopting the method to perform incomplete slot scheduling, all possibilities of a symbol position set of the gNB needing to detect the DMRS are listed as follows:

1. supporting the incomplete slot scheduling with a symbol starting point of 1 in a communication system, and scheduling 3 mini-slots with different lengths at most in the incomplete slot by the communication system for uplink transmission:

the UE transmits a mini-slot of 2 symbols, 4 symbols and 7 symbols, and the gNB should perform DMRS detection on the symbol {1,3,7} or {1,3,10} or {1,5,7} or {1,5,12} or {1,8,10} or on the union of the above symbols, i.e., the symbol {1,3,5,7,8,10,12} (refer to option 1 in fig. 2).

2. In the communication system, only 1 mini-slot is scheduled in an incomplete slot, and the scheduling is used for carrying out uplink transmission:

UE sends a 2-symbol mini-slot, and the gNB shall perform DMRS detection on symbol {12} (option 7 in fig. 8 a); or,

the UE sends a 4-symbol mini-slot, and the gNB should perform DMRS detection on the {10} symbol (option 6 in fig. 8 a); or,

the UE sends a 7-symbol mini-slot, and the gNB shall perform DMRS detection on symbol 7 (option 4 in fig. 8 a).

3. Support scheduling 2 mini-slots with different lengths at most in incomplete slot in communication system for uplink transmission

The UE sends a 4-symbol and a 7-symbol mini-slot, and the gNB shall perform DMRS detection on either the {3,7} or {3,10} symbol, or on the union of the two, i.e., the {3,7,10} (option 2 in fig. 8 a); or

The UE sends a mini-slot of 2 and 7 symbols, and the gNB shall perform DMRS detection on either the {5,7} or {5,12} symbol, or on the union of the two, i.e., the {5,7,12} (option 3 in fig. 8 a); or

The UE transmits one 2-symbol and one 4-symbol mini-slot, and the gNB shall perform DMRS detection on either the {8,10} or {8,12} symbol, or on the union of the two, i.e., the {8,10,12} (option 5 in fig. 8 a).

when the sequence of the DMRS is generated to be related to the symbol position where the DMRS is located (that is, the symbol position where the DMRS is located is one of the input parameters of the DMRS sequence), and the UE cannot update the DMRS contained in the mini-slot in real time according to the LBT state, the type, number, and position of the mini-slot that the UE can support are limited. For example, when a DMRS of mini-slot having a duration of 2 symbols is generated from a symbol 1 position, it can be transmitted only at symbols 1-2. When the UE prepares only one mini-slot of 2,4,7 symbols respectively, which starts to be transmitted at 1,3,7 symbols, DMRS generation corresponding to the mini-slot is correlated with

symbol positions

1,3, 7.

When the uplink transmission time slot configured for the UE by the gNB is one or more complete slots, the minislot combination sent in the aforementioned scheduled time slot after the LBT is successful by the UE is called a second kind of mini-slot combination.

At this time, according to the different LBT status, the possible transmission modes of the UE are as follows:

1. supporting the incomplete slot scheduling with a symbol starting point of 1 in a communication system, and scheduling 3 mini-slots with different lengths at most in the incomplete slot by the communication system for sending:

the UE transmits a 2-symbol, a 4-symbol and a 7-symbol mini-slot, and the gNB shall perform DMRS detection on the {1,3,7} symbols (option 1 in fig. 8 a).

2. 1 mini-slot is scheduled to transmit in an incomplete slot in a communication system:

3. Support scheduling 2 mini-slots with different lengths at most in incomplete slot to transmit in communication system

The UE sends a 4-symbol and 7-symbol mini-slot, and the gNB shall perform DMRS detection on the {3,7} symbols (option 2 in fig. 2).

The number of mini-slots and the length of the mini-slots selected by the UE can be specified by a standard or can be configured by the gNB. When the preset transmission positions of the 2,4,7 symbols mini-slot prepared by the UE are different, for example, when the UE transmits the 4 symbol mini-slot first and then transmits the 2 symbol mini-slot and the 7 symbol mini-slot, the DMRS symbol detection position may change correspondingly, which is not described herein again.

The third kind of mini-slot combination and the symbol position that should be detected at least at the receiving side:

when the sequence generation of the DMRS is not related to the symbol position where the DMRS is located, or the sequence generation of the DMRS is related to the symbol position where the DMRS is located and the UE has strong capability, the UE can update the DMRS carried in the mini-slot in real time according to the LBT state.

When the uplink transmission time slot configured for the UE by the gNB is greater than 1 slot of 14 symbols, and an incomplete slot resource with the length of L is arranged after the last complete time slot, wherein the L is less than 14 symbols; or, the uplink transmission timeslot configured by the gNB for the UE only includes an incomplete slot resource with a length of L, where L is smaller than 14 symbols (and the resource time domain starting position is a symbol position 0 of the complete slot resource). And after the LBT is successful, the UE sends a mini-slot combination in the scheduled L time slot, which is called a mini-slot combination of the third kind.

Assuming that the maximum transmission length of the UE in a slot is 1 mini-slots of 2,4, and 7 symbols, a communication system may support a total of 7 non-slot based scheduling (non-slot based scheduling) with different durations. The communication system performs non-complete slot scheduling using the following method.

All possibilities for the set of symbol positions for which the gNB needs to detect the DMRS are listed as follows:

when the last incomplete slot schedule lasts 13 symbols:

when LBT passes before symbol 0, the UE may directly transmit an incomplete slot with duration of 13 symbols, whose DMRS is located at symbol 0. The gNB detects the DMRS on the symbol 0 to know that the UE sends the incomplete slot with the duration of 13 symbols, at the moment, the UE also can send a combination of 2+4+7 symbols mini-slot, and the gNB can distinguish the two situations by detecting whether the

symbols

2 and 6 have additional DMRS;

if the LBT is not passed at symbol 0, the UE continues LBT sensing, and if the LBT passes before symbol 2, the UE may transmit a mini-slot of one 4 symbol and one 7 symbol starting from symbol 1 or symbol 2. The gNB performs DMRS detection on each symbol starting from symbol 0, and may detect the DMRS on a symbol { K, K +4} or { K, K +7}, where K is an initial symbol position for the UE to perform mini-slot transmission;

if the UE fails in LBT symbol 2, the UE continues LBT sensing, and if LBT passes before symbol 4, the UE may transmit mini-slots of one 2 symbol and one 7 symbol starting from symbol 3 or symbol 4. The gNB performs DMRS detection on each symbol starting from symbol 3, and may detect the DMRS on a symbol { K, K +2} or { K, K +7}, where K is an initial symbol position for the UE to perform mini-slot transmission;

if the UE fails LBT at symbol 4, the UE continues LBT listening, and if LBT passes before symbol 6, the UE may send a mini-slot of 7 symbols from symbol 5 or symbol 6. The gNB may perform DMRS detection on each symbol starting at symbol 5, possibly DMRS detection on {5} or {6 };

if the UE fails LBT at symbol 6, the UE continues LBT sensing, and if LBT passes before symbol 7, the UE may transmit a mini-slot of one 2 symbol and one 4 symbol starting from symbol 7. DMRS detection is performed on each symbol by the gNB starting from symbol 7, and the DMRS can be detected by the gNB on {7,9} or {7,11 };

if the UE fails LBT at symbol 7, the UE continues LBT sensing, and if LBT passes before symbol 9, the UE may transmit a mini-slot of 4 symbols starting from symbol 8 or symbol 9. The gNB may perform DMRS detection on each symbol starting from symbol 8, possibly on

symbols

8 or 9;

if the UE fails LBT at symbol 9, the UE continues LBT sensing, if LBT passes before symbol 11, the UE may start sending a 2-symbol mini-slot from

symbol

10 or 11, the gNB may start DMRS detection on each symbol from symbol 10, and may detect DMRS on {10} or {11 }.

To sum up, the gNB may first detect the DMRS at symbol 0, and if the detection is successful, the UE sends an incomplete slot with a length of 13 symbols. If the DMRS is detected in symbol 1 or symbol 2, whether the UE sends 4-symbol mini-slot + 7-symbol mini-slot or 7-symbol mini-slot + 4-symbol mini-slot may be determined according to the symbol position of the subsequent DMRS. Of course, in another example, the transmission order of different mini-slots may be fixed by a standard, for example, the transmission order according to the size of the mini-slot, such as the transmission order of the large mini-slot first and the small mini-slot second, or the transmission order of the small mini-slot first and the large mini-slot second. The mini-slot with the small initial length can further utilize time frequency resources and improve the utilization rate of the time frequency resources. In the foregoing example, as long as the mini-slot transmission order is fixed, no additional DMRS detection is required on the receiving side. If the DMRS is detected at symbol 3 or symbol 4, the UE sends 2 symbols mini-slot +7 symbols mini-slot. If the DMRS is detected at symbol 5 or symbol 6, the UE sends one 7-symbol mini-slot. If a DMRS is detected at symbol 7, the UE sends 2 symbols mini-slot +4 symbols mini-slot. If the DMRS is detected at symbol 8 or symbol 9, the UE sends one 4-symbol mini-slot. If the DMRS is detected at either

symbol

10 or 11, the UE sends one 2-symbol mini-slot.

When the last incomplete slot schedule lasts L (L <13) symbols:

when LBT passes before symbol 0, the UE may directly transmit an incomplete slot with duration L symbol, and its DMRS is located at symbol 0. The gNB detects the DMRS on the symbol 0, that is, the UE can know that the UE sends an incomplete slot with the duration of L symbols;

if the LBT is not passed when the UE is at symbol 0, the UE continues to perform LBT listening, if the LBT passes before the symbol (M ═ L-11, M >0), the UE transmits a mini-slot of 4 symbols and 7 symbols, and the gNB may perform DMRS detection on the symbol { M, M +4} or { M, M +7}, or on the union of the above symbols, i.e., symbol { M, M +4, M +7 };

if the LBT is not passed when the UE is at symbol 0, the UE continues to perform LBT listening, if the LBT passes before the symbol (M ═ L-9, M >0), the UE transmits a mini-slot of 2 symbols and 7 symbols, and the gNB may perform DMRS detection on the symbol { M, M +2} or { M, M +7}, or on the union of the above symbols, i.e., symbol { M, M +2, M +7 };

if the LBT does not pass at the symbol 0, the UE continues LBT listening, if the LBT passes before the symbol (M ═ L-7, M >0), the UE sends a mini-slot of 7 symbols, and the gNB can perform DMRS detection on the symbol { M };

if the LBT is not passed when the UE is at symbol 0, the UE continues to perform LBT listening, if the LBT passes before the symbol (M ═ L-6, M >0), the UE transmits a mini-slot of 2 symbols and 4 symbols, and the gNB may perform DMRS detection on the symbol { M, M +2} or { M, M +4} or on the union of the above symbols, i.e., symbol { M, M +2, M +4 };

if the LBT does not pass at the symbol 0, the UE continues LBT listening, if the LBT passes before the symbol (M ═ L-4, M >0), the UE sends a mini-slot of 4 symbols, and the gNB can perform DMRS detection on the symbol { M }; if the LBT does not pass at the symbol 0, the UE continues LBT listening, if the LBT passes before the symbol (M ═ L-2, M >0), the UE sends a mini-slot of 2 symbols, and the gNB can perform DMRS detection on the symbol { M };

in summary, the gNB may detect the DMRS in the symbol set of the third time domain resource to determine a mini-slot or a mini-slot combination actually transmitted by the UE.

A fourth type of mini-slot combination and symbol positions that should be detected at least:

when the sequence generation of the DMRS is related to the symbol position where the DMRS is located and the UE capability is weak, the UE cannot update the DMRS carried in the mini-slot in real time according to the LBT state.

When the uplink transmission time slot configured for the UE by the gNB is greater than 1 slot of 14 symbols, and an incomplete slot resource with the length of L is arranged after the last complete time slot, wherein the L is less than 14 symbols; or, the uplink transmission timeslot configured by the gNB for the UE only includes an incomplete slot resource with a length of L, where L is smaller than 14 symbols (and the resource time domain starting position is a symbol position 0 of the complete slot resource). And after the LBT is successful, the UE sends a mini-slot combination in the scheduled L time slot, which is called a mini-slot combination of the fourth type.

Optionally, it may be agreed that the UE transmits 1 mini-slots with lengths of 2,4, and 7 symbols at most in the slot, and the UE first transmits the mini-slots with lengths of 2,4, and 7 symbols according to a certain sequence, and generates the DMRS according to a symbol position where each mini-slot is located. And the UE performs incomplete slot scheduling by adopting the method.

when the last incomplete slot schedule lasts 13 symbols:

in one example, the method for UE to configure the mini-slot transmission includes transmitting 2 symbols mini-slot first, then 4 symbols mini-slot, and finally 7 symbols mini-slot.

When LBT passes before symbol 0, the UE may directly transmit an incomplete slot with duration of 13 symbols, whose DMRS is located at symbol 0. The gNB detects the DMRS on symbol 0, which means that the UE transmits an incomplete slot with a duration of 13 symbols or a mini-slot combination of 2+4+7 symbols. The gNB may distinguish between the two through DMRS detection at symbol 2, symbol 6 positions;

if the LBT is not passed at symbol 0, the UE continues LBT sensing, and if the LBT is passed before symbol 2, the UE transmits a mini-slot of one 4 symbol and one 7 symbol starting from symbol 2. The gNB may perform DMRS detection on each symbol starting from symbol 0, possibly on symbols {2,6 };

if the UE fails LBT at symbol 2, the UE will continue LBT sensing, and if LBT passes before symbol 6, the UE will send a mini-slot of 7 symbols from symbol 6. The gNB may perform DMRS detection on each symbol starting from symbol 2, possibly on symbol 6;

in summary, the gNB may first detect the DMRS at symbol 0, and if the detection is successful, the UE sends an incomplete slot with a length of 13 symbols or a combination of 2+4+7 symbols mini-slot; if the DMRS is detected at the symbol 2, the UE sends a 4 symbol mini-slot +7 symbol mini-slot; if a DMRS is detected at symbol 6, the UE sends one 7-symbol mini-slot. The sending mechanism and the gNB detection method when the mini-slot configured by the UE is 2+4+7 are given above. The UE may also adopt other mini-slot transmission configurations, which may be given by a standard or specifically configured by the gNB.

When the last incomplete slot schedule lasts L (L <13) symbols:

assuming that the maximum transmission length of the UE in a slot is 1 mini-slots of 2,4 and 7 symbols, the UE firstly transmits the mini-slots of 2,4 and 7 symbols according to a certain sequence and generates the DMRS according to the symbol position of each mini-slot.

For example, when L is 12, the UE may configure one 4-symbol mini-slot and one 7-symbol mini-slot within the incomplete slot. At this time, all possible mini-slot transmission modes of the UE are as follows:

when LBT passes before symbol 0, the UE may directly transmit an incomplete slot with duration L symbol, and its DMRS is located at symbol 0. The gNB detects the DMRS on the symbol 0 to know that the UE sends the incomplete slot with the duration of L symbols;

if the LBT does not pass at the symbol 0, the UE continues to perform LBT listening, and if the LBT passes before the symbol (M ═ L-11, M >0), the UE configures and transmits a mini-slot of 4 symbols and 7 symbols in advance, and the gNB may perform DMRS detection on the symbol { M, M +4} or { M, M +7} or on the union { M, M +4, M +7} of the symbols;

if the LBT does not pass at symbol 0, the UE continues LBT listening, if the LBT passes before the symbol (M ═ L-7, M >0), the UE sends a mini-slot of 7 symbols, and the gNB performs DMRS detection on the symbol { M } from the symbol { L-10 };

in summary, the gNB determines the symbol position set detection used for DMRS detection according to the number of the persistent symbols of the third time domain resource, so as to determine the mini-slot or the mini-slot combination actually transmitted by the UE. It should be noted that the gNB determines the possible mini-slot configurations (such as the number of prepared mini-slots and the duration thereof) and the corresponding DMRS detection symbol position sets in the above steps according to the value of the previously configured L, and the method is the same as the above description, and is not described herein again. In addition, the mini-slot combination configured by the UE may be specifically configured by the gNB, and may also be given by the standard. If the UE configures one 4-symbol mini-slot and 7-symbol mini-slot, the gNB may configure a mini-slot that transmits 4 symbols first and then 7 symbols, or may give by the standard that at this time, the UE only transmits 4 symbols mini-slot first and then 7 symbols mini-slot.

The fifth kind of mini-slot combination and the symbol position that should be detected at least at the receiving side:

When the uplink transmission time slot configured for the UE by the gNB is greater than 1 slot of 14 symbols, and before the first complete time slot, an incomplete slot resource with the length of L, wherein L is smaller than 14 symbols, is also available; or, the uplink transmission timeslot configured by the gNB for the UE only includes an incomplete slot resource with a length of L, where L is smaller than 14 symbols (and the time domain end position of the resource is the symbol position 13 of the complete slot resource). And after the LBT is successful, the UE sends a mini-slot combination in the scheduled L time slot, which is called a fifth mini-slot combination.

when the first incomplete slot schedule lasts 13 symbols:

when LBT passes before symbol 1, the UE may directly transmit an incomplete slot with duration of 13 symbols, whose DMRS is located at symbol 1. The gNB detects the DMRS on the symbol 0 to know that the UE sends the incomplete slot with the duration of 13 symbols, at the moment, the UE also can send a combination of 2+4+7 symbols mini-slot, and the gNB can distinguish the two situations by detecting whether additional DMRS exist in the

symbols

3 and 7;

if the LBT is not passed at symbol 1, the UE continues LBT sensing, and if the LBT passes before symbol 3, the UE may transmit a mini-slot of one 4 symbol and one 7 symbol starting from symbol 2 or symbol 3. The gNB performs DMRS detection on each symbol from symbol 1, and may detect the DMRS on a symbol { K, K +4} or { K, K +7}, where K is an initial symbol position for the UE to perform mini-slot transmission;

if the UE fails LBT at symbol 3, the UE continues LBT sensing, and if LBT passes before symbol 5, the UE may transmit a mini-slot of one 2 symbol and one 7 symbol starting from symbol 4 or symbol 5. The gNB performs DMRS detection on each symbol starting from symbol 4, and may detect the DMRS on a symbol { K, K +2} or { K, K +7}, where K is an initial symbol position for the UE to perform mini-slot transmission;

if the UE fails LBT at symbol 5, the UE will continue LBT listening, if LBT passes before symbol 7, the UE may send a mini-slot of 7 symbols from symbol 6 or symbol 7. The gNB may perform DMRS detection on each symbol starting from symbol 5, possibly on

symbol

6 or 7;

if the UE fails LBT at symbol 7, the UE continues LBT sensing, and if LBT passes before symbol 8, the UE may transmit a mini-slot of one 2 symbol and one 4 symbol starting from symbol 8. DMRS detection is performed on each symbol by the gNB starting from symbol 8, and the DMRS can be detected by the gNB on {8,10} or {8,12 };

if the UE fails LBT at symbol 8, the UE continues LBT listening, and if LBT passes before symbol 10, the UE may start sending a 4-symbol mini-slot from symbol 9 or symbol 10. The gNB may perform DMRS detection on each symbol starting from symbol 9, possibly on symbol {9} or {10 };

if the UE fails LBT at symbol 10, the UE continues LBT sensing, if LBT passes before symbol 12, the UE may start sending a 2-symbol mini-slot from

symbol

11 or 12, the gNB may start DMRS detection on each symbol from symbol 11, and may detect DMRS on {11} or {12 }.

To sum up, the gNB may first detect the DMRS at symbol 1, and if the detection is successful, the UE sends an incomplete slot with a length of 13 symbols. If the DMRS is detected at symbol 2 or symbol 3, whether the UE sends 4-symbol mini-slot + 7-symbol mini-slot or 7-symbol mini-slot + 4-symbol mini-slot may be determined according to the symbol position of the subsequent DMRS. Of course, in another example, the transmission order of different mini-slots may be fixed by a standard, for example, the transmission order according to the size of the mini-slot, such as the transmission order of the large mini-slot first and the small mini-slot second, or the transmission order of the small mini-slot first and the large mini-slot second. The mini-slot with the small initial length can further utilize time frequency resources and improve the utilization rate of the time frequency resources. In the foregoing example, as long as the mini-slot transmission order is fixed, no additional DMRS detection is required on the receiving side. If the DMRS is detected at symbol 4 or symbol 5, the UE sends 2 symbols mini-slot +7 symbols mini-slot. If the DMRS is detected at symbol 6 or symbol 7, the UE sends one 7-symbol mini-slot. If a DMRS is detected at symbol 8, the UE sends 2 symbols mini-slot +4 symbols mini-slot. If the DMRS is detected at symbol 9 or symbol 10, the UE sends one 4-symbol mini-slot. If the DMRS is detected at either symbol 11 or symbol 12, the UE has transmitted one 2-symbol mini-slot.

When the first incomplete slot schedule lasts L (L <13) symbols:

when the LBT before the symbol (14-L) is passed by the UE, the UE can directly send an incomplete slot with the duration of L symbols, and the DMRS of the incomplete slot is located in the symbol (14-L). The gNB detects the DMRS on a symbol (14-L), that is, the UE can know that the UE sends an incomplete slot with the duration of L symbols;

if the LBT of the UE is not passed in the symbol (14-L), the UE continues LBT listening, if the LBT is passed in front of the symbol (M,14-L is less than or equal to M,11 is less than or equal to L <13), the UE sends mini-slot of 4 symbols and 7 symbols, and the gNB can carry out DMRS detection on the symbol { M, M +4} or { M, M +7} or on the union of the symbols, namely the symbol { M, M +4, M +7 };

if the LBT of the UE is not passed at the symbol 3, the UE continues LBT listening, if the LBT is passed before the symbol (M,14-L is less than or equal to M,9 is less than or equal to L <13), the UE sends mini-slot of one 2 symbol and one 7 symbol, and the gNB can carry out DMRS detection on the symbol { M, M +2} or { M, M +7} or the union of the symbols, namely the symbol { M, M +2, M +7 };

if the LBT of the UE does not pass through the symbol 5, the UE continues to carry out LBT listening, if the LBT passes through before the symbol (M, L is more than or equal to 7 and less than 13), the UE sends a mini-slot of 7 symbols, and the gNB can carry out DMRS detection on the symbol { M };

if the LBT of the UE is not passed in the symbol (14-L), the UE continues LBT listening, if the LBT is passed in front of the symbol (M,14-L is less than or equal to M,6 is less than or equal to L <13), the UE sends mini-slot of 2 symbols and 4 symbols, and the gNB can carry out DMRS detection on the symbol { M, M +2} or { M, M +4} or on the union of the symbols, namely the symbol { M, M +2, M +4 };

if the LBT of the UE is not passed in the symbol (14-L), the UE can continuously carry out LBT listening, if the LBT is passed in front of the symbol (M,14-L is less than or equal to M,4 is less than or equal to L <13), the UE can send a mini-slot of 4 symbols, and the gNB can carry out DMRS detection on the symbol { M };

if the LBT of the UE is not passed in the symbol (14-L), the UE can continuously carry out LBT listening, if the LBT is passed in front of the symbol (M,14-L is less than or equal to M,2 is less than or equal to L <13), the UE can send a mini-slot of 2 symbols, and the gNB can carry out DMRS detection on the symbol { M };

in summary, the gNB may detect the DMRS in the symbol set of the third time domain resource to determine a mini-slot or a mini-slot combination actually transmitted by the UE. It should be noted that the gNB determines from which step the DMRS detection starts according to the value of the previously configured L, and if L is 8, the gNB starts to detect the DMRS from step b; if L is 4, the gNB will only perform DMRS detection of step e.

A sixth type of mini-slot combination and symbol positions that should be detected at least:

when the sequence generation of the DMRS is related to the symbol position where the DMRS is located and the UE capability is weak, the UE cannot update the DMRS carried in the mini-slot in real time according to the LBT state. When the uplink transmission time slot configured for the UE by the gNB is greater than 1 slot of 14 symbols, and before the first complete time slot, an incomplete slot resource with the length of L, wherein L is smaller than 14 symbols, is also available; or, the uplink transmission timeslot configured by the gNB for the UE only includes an incomplete slot resource with a length of L, where L is smaller than 14 symbols (and the time domain end position of the resource is the symbol position 13 of the complete slot resource). And after the LBT is successful, the UE sends a mini-slot combination in the scheduled L time slot, which is called a type six mini-slot combination.

when the first incomplete slot schedule lasts 13 symbols:

When LBT passes before symbol 1, the UE may directly transmit an incomplete slot with duration of 13 symbols, whose DMRS is located at symbol 1. The gNB detects the DMRS on symbol 1, and then knows that the UE has transmitted an incomplete slot with a duration of 13 symbols or a mini-slot combination of 2+4+7 symbols. The gNB may distinguish between the former two through DMRS detection at symbol 3, symbol 7 positions;

if the LBT is not passed by the UE at symbol 1, the UE continues LBT sensing, and if the LBT is passed before symbol 3, the UE starts to transmit mini-slots of one 4 symbol and one 7 symbol from symbol 3. The gNB may perform DMRS detection on each symbol starting from symbol 1, possibly on symbols {3,7 };

if the UE fails LBT at symbol 3, the UE will continue LBT sensing, and if LBT passes before symbol 7, the UE will send a mini-slot of 7 symbols from symbol 7. The gNB may perform DMRS detection on each symbol starting from symbol 3, possibly on symbol {7 };

in summary, the gNB may first detect the DMRS at symbol 1, and if the detection is successful, the UE sends an incomplete slot with a length of 13 symbols or a combination of 2+4+7 symbols mini-slot; if the DMRS is detected at the symbol 3, the UE sends a 4 symbol mini-slot +7 symbol mini-slot; if a DMRS is detected at symbol 7, the UE sends one 7-symbol mini-slot. The sending mechanism and the gNB detection method when the mini-slot configured by the UE is 2+4+7 are given above. The UE may also adopt other mini-slot transmission configurations, which may be given by a standard or specifically configured by the gNB.

When the first incomplete slot schedule lasts L (L <13) symbols:

when LBT passes before symbol 2, the UE may directly transmit an incomplete slot with duration L symbol, and its DMRS is located at symbol 2. The gNB detects the DMRS on the symbol 2 to know that the UE sends the incomplete slot with the duration of L symbols;

if the LBT of the UE does not pass at the symbol 2, the UE continues to carry out LBT listening, if the LBT passes before the symbol (M,14-L is less than or equal to M,11 is less than or equal to L <13), the UE configures and sends mini-slot of 4 symbols and 7 symbols in advance, and the gNB can carry out DMRS detection on the symbol { M, M +4} or { M, M +7} or the union { M, M +4, M +7} of the symbols;

if the LBT of the UE does not pass through the symbol 2, the UE continues to carry out LBT listening, if the LBT passes through before the symbol (M,14-L is less than or equal to M,9 is less than or equal to L <13), the UE sends a mini-slot of 7 symbols, and the gNB carries out DMRS detection on the symbol { M };

Further, the former one or more (x) symbols in the complete/incomplete slot of uplink transmission configured by the gNB for the UE may be used for performing LBT, and the DMRS detection symbol position in the first/second/third/fourth/fifth/sixth type minislot combination is shifted backward by x symbols, which is not described herein again.

In summary, the UE determines the mini-slot \ slot combination to be sent according to the LBT result, the uplink slot information configured for the UE by the gNB, and the allowed mini-slot combination (e.g., defining the first symbol position set) defined by the standard.

Preferably, in another embodiment, when the UE has a relatively high capability, the DMRS carried by the mini slot/slot may be updated in real time according to the LBT result, and the UE may transmit more than 1 mini-slot/slot PUSCH, optionally, the UE may send the DMRS only on the first mini-slot/slot of the one or more mini-slots/slots allowed to be sent. This may further save overhead. At this time, the gmb may not be able to determine the mini-slot/slot order transmitted by the UE according to the DMRS, but the mini-slot/slot transmission order may be configured by the gmb (as indicated in RMSI/OSI) or given by a standard.

When uplink resources configured by the gNB for the UE only include 1 initial incomplete slot, the gNB should perform DMRS detection according to the UE capability and the fifth/sixth type minislot combination (i.e. the first symbol position set or the subset thereof) to determine the mini-slot/slot combination actually transmitted by the UE;

when uplink resources configured by the gNB for the UE only include 1 tail incomplete slot, the gNB determines the mini-slot/slot combination actually transmitted by the UE according to the UE capability and DMRS detection performed according to the third/fourth type mini slot combination (i.e. the second symbol position set and/or the third symbol position set);

when uplink resources configured by the gNB for the UE include 1 initial incomplete slot plus a plurality of complete slots, the gNB determines the mini-slot/slot combination actually sent by the UE by performing DMRS detection on the complete slots according to the first/second type mini-slot combination (the first symbol position set and/or the second symbol position set) according to the capability of the UE and according to the fifth/sixth type mini-slot combination (namely the first symbol position set or the subset thereof) at the initial incomplete slot;

when uplink resources configured by the gNB for the UE include 1 initial incomplete slot plus a plurality of complete slots plus 1 tail incomplete slot, the gNB determines a mini-slot/slot combination actually sent by the UE by performing DMRS detection on the initial incomplete slot according to the fifth/sixth type mini-slot combination (i.e. the first symbol position set or the subset thereof) on the complete slot according to the UE capability, and on the tail incomplete slot according to the third/fourth type mini-slot combination (i.e. the second symbol position set and/or the third symbol position set) on the complete slot according to the first/second type mini-slot combination (i.e. the first symbol position set and/or the second symbol position set);

when uplink resources configured by the gNB for the UE include a plurality of complete slots plus 1 tail incomplete slot, the gNB determines the mini-slot/slot combination actually sent by the UE by performing DMRS detection on the tail incomplete slot according to the third/fourth type mini-slot combination (namely the second symbol position set and/or the third symbol position set) on the complete slot according to the first/second type mini-slot combination (the first symbol position set and/or the second symbol position set) according to the UE capability;

when uplink resources configured by the gNB for the UE include a plurality of complete slots, the gNB needs to perform DMRS detection on the complete slots according to the UE capability and the first/second type mini slot combination (the first symbol position set and/or the second symbol position set) to judge the mini-slot/slot combination actually transmitted by the UE;

when uplink resources configured by the gNB for the UE include 1 initial incomplete slot plus 1 last incomplete slot, the gNB should perform DMRS detection on the initial incomplete slot according to the fifth/sixth type of minislot combination (i.e., the first symbol position set or the subset thereof) according to the UE capability, and determine the mini-slot/slot combination actually transmitted by the UE according to the third/fourth type of minislot combination (i.e., the second symbol position set and/or the third symbol position set) on the last incomplete slot.

(II) with respect to the first set of symbol positions

preferably, the first set of symbol positions includes, but is not limited to:

example 1, {1,3,7 }:

DMRS may only be carried on

symbols

1,3, 7. That is, the receiving side can detect whether there is a DMRS only on 3 symbols, and the 3 symbols are 1,3, and 7.

Example 2, {3,7 }:

PUSCH is only possible to carry DMRS on

symbols

3, 7.

Example 3, {5,7 }:

PUSCH is only possible to carry DMRS on

symbols

5, 7.

Example 4, {8,10 }:

PUSCH is only possible to carry DMRS on

symbols

8, 10.

In the above embodiment, the information to be sent is also carried in the incomplete slot after LBT is successful, so that resources can be efficiently utilized. On the other hand, compared with a scheme that DMRS is likely to be carried on each symbol in an incomplete slot, by specifying a symbol position that may carry DMRS, a transmission process may be simplified, and accordingly, complexity of blind detection of a PUSCH at a receiving side may be simplified.

Frame structure on (III) complete slots

As mentioned in the schemes of fig. 101c-102c and 101d-102d, an uplink transmission timeslot after LBT is successful may include one or more time domain resources (14 symbols) with a full slot length. The complete 14 symbols can adopt the existing slot frame structure, and can also be the combination of a plurality of mini-slots.

Preferably, after the LBT is successful, the other DMRSs and the scheduled PUSCH are further sent on one or more complete slot time-domain resources, and a symbol position where the DMRS is located is recorded as the second symbol position set. The second set of symbol positions is different from the first set of symbol positions.

For a full slot PUSCH scheduling UE, DMRS can be transmitted at a symbol 0, whether DMRS is transmitted at other positions or not and the number of DMRS is not determined. On the side of the gNB, the detection of DMRS should be done at least at symbol 2. With the above scheme, the second symbol position set has only {0 }.

For example, the UE side may use 2 mini-slots of 7 symbols within a full slot, i.e. DMRS may only be carried on

symbols

0, 7. Alternatively, 3 mini-slots of 4 symbols and 1 mini-slot of 2 symbols may be used within a full slot, i.e., DMRS may only be carried on

symbol

0,7 or

symbol

0,2,6, 10. Accordingly, on the gbb side, DMRS detection should be performed at least on symbol {0,7} or symbol {0,2,6,10 }. The set of symbols is the second set of symbol positions for the complete slot.

Preferably, 1, or 2 or more of the above second set of symbol positions may be defined. When there are multiple types, the network device side may also send an indication of the current second symbol position set, so that the UE adopts the indicated second symbol position set for the complete slot.

It should be noted that for clarity of the scheme, whether uplink transmission or downlink transmission, one or more of the aforementioned position sets may be defined in the standard for the aforementioned first, second (if any) or third (if any) symbol position sets. If one, no additional indication is required; if multiple, it may be desirable to indicate the set of locations used. The specific indication thereof is not limited herein.

Preferably, the criteria may define the allowed mini-slot combinations other than (one or more than) the allowed mini-slot combinations, and the criteria may further define the allowed order in which the individual mini-slots are transmitted, which may be one or more than one. Preferably, an order of sending mini-slots is agreed. For example, according to the transmission order of the mini-slots, for example, the mini-slot with large length is transmitted first and the mini-slot with small length is transmitted later, or the mini-slot with small length is transmitted first and the mini-slot with large length is transmitted later. The mini-slot with the small initial length can further utilize time frequency resources and improve the utilization rate of the time frequency resources. The fixed mini-slot order may further simplify the detection process at the receiving side. In each embodiment, by defining a first symbol position set (if any), a second symbol position set (if any) or a third symbol position set (if any), referring to fig. 8 and 8a, on one hand, an allowed mini-slot combination is defined, and on the other hand, an allowed mini-slot order is defined, so that the communication efficiency is improved, and the receiving side processing is simplified.

Specifically, the method comprises the following different modes:

101-1, the standard defines only one of a first set of symbol positions (if any), a second set of symbol positions (if any), or a third set of symbol positions (if any). That is, there is only one set of possible (allowed) combinations of mini-slots. Or, the standard directly defines the type, number and location of allowed mini-slots in the first time domain resource. It can also be understood that, for the uplink, it is defined at which symbol position in the slot where the first time domain resource is located the DMRS of each mini-slot may be. For downlink, it is defined at which symbol position in the slot where the first time domain resource is located the control signaling is possible.

101-2, the standard defines a plurality of first symbol position sets. That is, there are multiple sets of possible (allowed) combinations of mini-slots. In each first set of symbol positions, the possible symbol positions of the respective DMRSs are not identical. For example, any two or more symbol position sets in examples 1 to 7 described later.

Specifically, in the scheme of 101-2, the gNB may send an RRC or other signaling for explicitly or implicitly indicating, to the UE, a first symbol position set currently used by the network; in order for the UE to uplink on the (configured) symbol position currently used by the network. Each first symbol position set may have its index, or may be indicated by using a bitmap, or may be multiplexed with other information by using other methods.

For example, 1 bit bitmap (bitmap) of 14 bits is used for indicating, each bit corresponds to one OFDM symbol in a slot, a value of "1" of a bit indicates that the UE needs to perform DMRS blind detection at the symbol position, a value of "0" indicates that the UE does not need to perform DMRS blind detection at the symbol position, or vice versa, a value of "0" indicates that the UE needs to perform DMRS blind detection at the symbol position, and a value of "1" indicates that the UE does not need to perform DMRS blind detection at the symbol position.

For another example, when the first symbol position set is limited, for example, when the communication system supports only detection at position 0, only 1 bit is needed to indicate DMRS blind detection configuration that the UE should use when the communication system supports two symbol position sets of {3,7} or {3,7,10 }.

Optionally, in another embodiment different from the foregoing embodiments, LBT is only allowed to be performed (no communication transmission is allowed) on the first OFDM symbol in each possible mini slot or slot, and in this case, the standard-allowed position that may carry DMRS (uplink) or control signaling (downlink) may be the second OFDM symbol (or possibly 2-3 or 2-4 OFDM symbols) in each mini slot or slot. At this time, the first symbol position set, the second symbol position set or the third symbol position set adjusts the OFDM symbol positions carrying DMRS (uplink) or control signaling (downlink) according to the OFDM symbol positions excluding the disallowed communication.

For example, the first symbol position set {1,3,7} and the second symbol position set {0} are used as an example, if the scheme that the first OFDM symbol can only perform LBT is adopted, the first symbol position set is {3,7} and the second symbol position set is {1 }. Other examples are not described in detail.

In addition, an embodiment of the present invention further provides a wireless communication system, where the wireless communication system may be the wireless communication system 100 shown in fig. 1, or may also be the wireless communication system 10 shown in fig. 10, and the wireless communication system may include: network equipment and a terminal. The terminal may be the terminal in the foregoing embodiment, and the network device may be the network device in the foregoing embodiment. Specifically, the terminal may be the terminal 300 shown in fig. 2, and the network device may be the network device 400 shown in fig. 3. The terminal may also be the terminal 400 shown in fig. 10, and the network device shown may also be the network device 500 shown in fig. 10. For specific implementation of the network and the terminal, reference may be made to the foregoing embodiments, which are not described herein again.

Taking the network device shown in fig. 2 as an example, the network device processor 405 is configured to control the transmitter 407 to transmit in the unlicensed frequency band and/or the licensed frequency band and control the receiver 409 to receive in the unlicensed frequency band and/or the licensed frequency band. The transmitter 407 is configured to support a network device to perform a process of transmitting data and/or signaling. The receiver 409 is used to support the network device to perform the process of receiving data and/or signaling. The memory 405 is used to store program codes and data for the network devices.

Specifically, the transmitter 407 may be configured to perform the operations described above for 101a-102a, 101b-102b, 100, 103; 101c-102c, 101d-102d, and so on. For other functions and workflows, reference is made to the foregoing embodiments, and further description is omitted here. .

For specific implementation of each component in the network device, reference may be made to the foregoing method embodiment, and details are not described here.

Taking the terminal shown in fig. 2 as an example, the terminal processor 304 is configured to invoke the instructions stored in the memory 312 to control the transmitter 306 to transmit in the unlicensed frequency band and/or the licensed frequency band and to control the receiver 308 to receive in the unlicensed frequency band and/or the licensed frequency band. Transmitter 306 is configured to enable the terminal to perform the process of transmitting data and/or signaling. The receiver 308 is used to support the terminal to perform a process of receiving data and/or signaling. The memory 312 is used to store program codes and data of the terminal.

In particular, receiver 308 may be used for 201a-202a, 201b-202b, 200; 201c-202c, 201d-202d, etc. For other functions and workflows, reference is made to the foregoing embodiments, and further description is omitted here.

In particular, the transmitter 306 may be configured to transmit uplink data on the listened idle frequency domain resources.

For the specific implementation of each component in the terminal, reference may be made to the foregoing method embodiment, and details are not described here.

Those skilled in the art can understand that different partitions can be performed on each functional module in the embodiment, and the implementation of the product is not affected. For example, an LBT module may be partitioned to implement the LBT function of fig. 4A and \ or 4B, and a data preparation module may be partitioned to generate a cache mini-slot; different sending modules can be divided and are respectively used for sending CORESET and data; and the receiving module is respectively used for receiving the CORESET and the data. In the product, the modules are likely to be integrated in hardware or software, such as a processor or an integrated circuit.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware or in software executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in RAM, flash memory, ROM, Erasable Programmable Read Only Memory (EPROM), Electrically Erasable Programmable Read Only Memory (EEPROM), registers, a hard disk, a removable disk, a compact disc read only memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may be located in a transceiver or a relay device. Of course, the processor and the storage medium may reside as discrete components in a radio access network device or a terminal device.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in connection with the embodiments of the invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above embodiments are only intended to be illustrative of the embodiments of the present invention, and should not be construed as limiting the scope of the embodiments of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the embodiments of the present invention should be included in the scope of the embodiments of the present invention.

Claims

1.A signal transmission method, comprising:

carrying out LBT;

after LBT succeeds, sending an allowed micro-slot mini-slot combination on one or more time domain resources smaller than 1 slot; marking the initial symbol position of each mini-slot in the allowed mini-slot combination as a first symbol position set; the combination of mini-slots comprises one or more mini-slots;

the first set of symbol positions is one or more of the following sets of symbol positions:

{1,3,7}，{3,7,10}，{3,7}，{7，10}，{5,7,12}，{5,7}，{7,12}。

2. the method of claim 1, wherein each mini-slot includes a control resource set (CORESET) carrying control signaling, and wherein the control signaling includes: a first common control signaling, where the first common control signaling is used to indicate configuration information of a maximum channel occupancy time MCOT or a channel occupancy time COT;

or, one or more symbol positions in each mini-slot carry a demodulation reference signal (DMRS).

3. The method according to claim 1 or 2,

the first set of symbol positions is plural;

the method further comprises the following steps: transmitting an indication of the first set of symbol positions currently in use.

4. The method of claim 1, further comprising

After the LBT is successful, also transmitting on one or more time domain resources of 14 symbols: a complete slot or other mini-slot combination, and the starting symbol position of each mini-slot of the other mini-slot combination is recorded as a second symbol position set; the second set of symbol positions is different from the first set of symbol positions.

5. The method according to claim 1 or 2, characterized in that the method further comprises: an indication of the start position of the maximum channel occupancy time MCOT is sent.

6. A signal receiving method is characterized by comprising

Receiving a signal; processing a received signal according to an allowed mini-slot combination on at least one or more time domain resources smaller than 1 slot; the allowed mini-slot combination comprises one or more mini-slots; marking the initial symbol position of each mini-slot in the allowed mini-slot combination as a first symbol position set;

{1,3,7}，{3,7,10}，{3,7}，{7，10}，{5,7,12}，{5,7}，{7,12}。

7. the method of claim 6,

the first set of symbol positions is plural;

the method further comprises the following steps: an indication of a first set of symbol positions currently in use is received.

8. The method of claim 6, further comprising:

receiving a complete slot or other mini-slot combinations on one or more 14-symbol time domain resources, wherein the starting symbol position of each mini-slot of the other mini-slot combinations is recorded as a second symbol position set; the second set of symbol positions is different from the first set of symbol positions.

9. The method of claim 6, further comprising: an indication of a start position of a maximum channel occupancy time MCOT or a channel occupancy time COT is received.

10. The method of claim 6, wherein the signal is a downlink signal, and wherein processing the received signal comprises:

detecting whether control signaling exists on symbols 0 or 0,1 and 2 in a time slot;

and when the control signaling is not retrieved on the symbol 0 or the symbols 0,1 and 2, detecting whether the control signaling exists on at least n continuous symbols from each symbol in the first symbol position set in a time domain resource smaller than 1 time slot, wherein n is 1 or 2 or 3, so as to determine the received mini-slot combination.

11. The method of claim 6, wherein the signal is an uplink signal, and wherein processing the received signal comprises:

and sequentially detecting a demodulation reference signal (DMRS) on each symbol of the first symbol position set.

12. The method of claim 8, wherein the signal is an uplink signal, and wherein processing the received signal comprises:

and sequentially detecting a demodulation reference signal (DMRS) on each symbol of the union of the first symbol position set and the second symbol position set so as to determine the received mini-slot combination.

13. A signal transmission apparatus, comprising:

a first module for performing LBT;

a second module, configured to send an allowed mini-slot combination on one or more time domain resources smaller than 1 slot after LBT is successful; the allowed mini-slot combination comprises one or more mini-slots; marking the initial symbol position of each mini-slot in the allowed mini-slot combination as a first symbol position set;

{1,3,7}，{3,7,10}，{3,7}，{7，10}，{5,7,12}，{5,7}，{7,12}。

14. the apparatus of claim 13, wherein each mini-slot comprises a control resource set, CORESET, that carries control signaling, and wherein the control signaling comprises: a first common control signaling for indicating configuration information of the MCOT;

15. The apparatus of claim 13 or 14,

the first set of symbol positions is plural;

the device further comprises: transmitting an indication of the first set of symbol positions currently in use.

16. The apparatus of claim 14, further comprising

A third module for, after the LBT is successful, further transmitting on one or more time domain resources of 14 symbols: a complete slot or other mini-slot combination, and the starting symbol position of each mini-slot of the other mini-slot combination is recorded as a second symbol position set; the second set of symbol positions is different from the first set of symbol positions.

17. The apparatus of claim 13 or 14, further comprising: a fourth module for sending an indication of a starting position of a maximum channel occupancy time MCOT or a channel occupancy time COT.

18. A signal receiving apparatus, comprising

A first module for receiving a signal;

a second module, configured to process a received signal according to an allowed mini-slot combination on at least one or more time domain resources smaller than 1 slot; the allowed mini-slot combination comprises one or more mini-slots; marking the initial symbol position of each mini-slot in the allowed mini-slot combination as a first symbol position set;

{1,3,7}，{3,7,10}，{3,7}，{7，10}，{5,7,12}，{5,7}，{7,12}。

19. the apparatus of claim 18,

the first set of symbol positions is plural;

the device further comprises: an indication of a first set of symbol positions currently in use is received.

20. The apparatus of claim 18, further comprising:

a third module, configured to receive a complete slot or another mini-slot combination on one or more 14-symbol time domain resources, where a starting symbol position of each mini-slot of the other mini-slot combination is recorded as a second symbol position set; the second set of symbol positions is different from the first set of symbol positions.

21. The apparatus of claim 18, further comprising: a fourth module for receiving an indication of a start position of a maximum channel occupancy time, MCOT, or a channel occupancy time, COT.

22. The apparatus of claim 18, wherein the signal is a downlink signal, and the second module is specifically configured to:

23. The apparatus of claim 18, wherein the signal is an uplink signal, and wherein the apparatus comprises a fifth module configured to:

24. The apparatus of claim 20, wherein the signal is an uplink signal, and wherein the apparatus comprises a sixth module configured to: