WO2018103607A1

WO2018103607A1 - Method and apparatus for receiving uplink reference signal

Info

Publication number: WO2018103607A1
Application number: PCT/CN2017/114471
Authority: WO
Inventors: 吴作敏; 官磊; 李�远; 郑娟; 马莎
Original assignee: 华为技术有限公司
Priority date: 2016-12-07
Filing date: 2017-12-04
Publication date: 2018-06-14
Also published as: CN108173633B; CN108173633A

Abstract

Provided is a method and apparatus for receiving an uplink reference signal. The method comprises: a network device allocates for a terminal device a first time frequency resource used for uplink transmission, the first time frequency resource comprising at least two time units over a time domain, and the first time frequency resource being a time frequency resource used by the terminal device in a contention manner; the network device receives an uplink reference signal sent by the terminal device, the uplink reference signal being carried in a first time unit, the first time unit comprising the final time unit of the at least two time units, or the first time unit being the first time unit, which can be used by the terminal device, in the at least two time units. The present invention can improve the reliability and accuracy of uplink transmission.

Description

Method and apparatus for receiving an uplink reference signal

The present application claims priority to Chinese Patent Application No. 201611117773.3, filed on Dec. in.

Technical field

Embodiments of the present application relate to the field of communications, and more particularly, to a method and apparatus for receiving an uplink reference signal, and a method and apparatus for transmitting an uplink reference signal.

Background technique

At present, a communication method using a time-frequency resource in a competitive manner is known. For example, a terminal device can detect whether a certain time-frequency resource is currently in an idle state, or whether the time-frequency resource is used by another device, if the time-frequency is used. If the resource is in an idle state, or the time-frequency resource is not used by another device, the terminal device can use the time-frequency resource to perform communication, for example, performing uplink transmission, etc.; if the time-frequency resource is not in an idle state, or The time-frequency resource has been used by other devices, and the terminal device cannot use the time-frequency resource.

In order to improve the reliability and accuracy of the uplink transmission, the terminal device sends an uplink reference signal during the uplink transmission, and in the prior art, data on multiple Transmission Time Intervals (TTIs) can be shared. The uplink reference signal resource reduces the overhead of the reference signal and improves the resource utilization of the system. In addition, in order to reduce the processing delay of the uplink transmission, the uplink reference signal used for data demodulation on multiple transmission time intervals is carried in the front end of the time-frequency resource for uplink transmission allocated by the network device to the terminal device in the time domain. For example, the first TTI of the time-frequency resources allocated by the network device to the terminal device for uplink transmission.

Therefore, when the time-frequency resource allocated by the network device to the terminal device is based on the time-frequency resource used in the contention mode, the terminal device may not compete for the part of the time-frequency resource for carrying the uplink reference signal (for example, network device allocation) The first TTI in the time-frequency resource of the terminal device causes the terminal device to fail to send the uplink reference signal during uplink transmission, which seriously affects the reliability and accuracy of the uplink transmission.

Summary of the invention

The embodiments of the present application provide a method and apparatus for receiving an uplink reference signal, and a method and apparatus for transmitting an uplink reference signal, which can improve reliability and accuracy of uplink transmission.

A first aspect provides a method for receiving an uplink reference signal, where the method includes: the network device allocates, to the terminal device, a first time-frequency resource for uplink transmission, where the first time-frequency resource includes at least two in a time domain. a time unit, the first time-frequency resource is a time-frequency resource used by the terminal device in a contention manner; the network device receives an uplink reference signal sent by the terminal device, where the uplink reference signal is carried in a first time unit, where the A time unit includes a last one of the at least two time units, or the first time unit includes a first time unit of the at least two time units that the terminal device is usable.

Transmitting the uplink reference signal by the terminal device on the last time unit on the time-frequency resource allocated by the network device based on the contention mode, or by causing the terminal device to allocate the time-frequency resource used in the contention mode of the network device The uplink reference signal is sent on the first time unit that the device competes to ensure that the time unit for carrying the uplink reference signal can be used by the terminal device, thereby ensuring the transmission of the uplink reference signal, thereby improving the reliability of the uplink transmission and accuracy.

In conjunction with the first aspect, in a first implementation manner of the first aspect, the first time-frequency resource belongs to an unlicensed frequency band in a frequency domain.

By applying the method for transmitting an uplink reference signal in the embodiment of the present application in a communication system using an unlicensed band, the reliability of the transmission of the uplink reference signal in the communication system of the unlicensed band can be improved, thereby improving the communication system of the unlicensed band. Practicality, which is conducive to the popularization of communication systems in the licensed band.

With reference to the first aspect and the foregoing implementation manner, in a second implementation manner of the first aspect, when the first time unit includes a first time unit that can be used by the terminal device in the at least two time units, The uplink reference signal is carried in the first symbol of the first time unit that the terminal device can use.

The uplink reference signal can be sent at a later time than the uplink data or the uplink control by causing the terminal device to send the uplink reference signal on the first symbol that the terminal device contends in the time-frequency resource allocated by the network device. The transmission of the signal can facilitate the network device to detect or demodulate the uplink reference signal, thereby reducing the processing delay of the uplink transmission.

With reference to the first aspect and the foregoing implementation manner, in a third implementation manner of the first aspect, when the first time unit includes the first time unit that the terminal device can use in the at least two time units, Before the network device receives the uplink reference signal sent by the terminal device, the method includes: the network device sending the first indication information to the terminal device, where the first indication information is used to indicate that the terminal device is in the at least two time units The first time unit that the terminal device can use as the first time unit; or the network device sends the second indication information to the terminal device, where the second indication information is used to indicate that the terminal device is to perform the at least two time units The first time unit in the first time unit.

With reference to the first aspect and the foregoing implementation manner, in a fourth implementation manner of the first aspect, before the network device sends the first indication information or the second indication information to the terminal device, the method includes: the network The device determines that at least one of the at least two time units belongs to a maximum channel occupancy time MCOT that the network device is capable of using.

When some or all of the first time-frequency resources allocated by the network device to the terminal device belong to the MCOT used by the network device, the terminal device may use a higher-priority resource competition mode, so that the terminal device competes to the first The first time unit in the time-frequency resource is more likely. In this case, it is beneficial to uplink by causing the network device to instruct the terminal device to send the uplink reference signal in the first time unit or the first time unit that is contending. The transmission of the reference signal facilitates the network device to detect or demodulate the uplink reference signal as early as possible, thereby reducing the processing delay of the uplink transmission.

With reference to the first aspect and the foregoing implementation manner, in a fifth implementation manner of the first aspect, when the first time unit includes a last one of the at least two time units, the network device receives the terminal Before the uplink reference signal sent by the device, the method includes: the network device sending third indication information to the terminal device, where the third indication information is used to indicate that the terminal device uses the last time unit of the at least two time units as The first time unit.

With reference to the first aspect and the foregoing implementation manner, in a sixth implementation manner of the first aspect, before the network device sends the third indication information to the terminal device, the method includes: determining, by the network device, the at least two At least one time unit in the time unit does not belong to the MCOT that the network device can use.

When some or all of the time units of the first time-frequency resource terminal allocated by the network device to the terminal device do not belong to the MCOT used by the network device, the terminal device may use a resource competition mode with a lower priority, so that the terminal device competes to The time unit located at the front end of the first time-frequency resource is less likely. In this case, by causing the network device to instruct the terminal device to send the uplink reference signal on the last time unit of the first time-frequency resource, the uplink can be reliably ensured. The transmission of the reference signal further improves the reliability and accuracy of the uplink transmission.

With reference to the first aspect and the foregoing implementation manner, in a seventh implementation manner of the first aspect, when the first time unit includes a last one of the at least two time units, the method further includes: if the bearer If the receiving of the uplink data on the second time unit is incorrect, the network device determines that the redundancy version RV used for the retransmission of the uplink data is 0, wherein the second time unit includes the at least two time units The time unit except the first time unit.

When the terminal device sends the uplink reference signal through the last time unit in the first time-frequency resource, the network device cannot determine the starting position of the uplink transmission by using the uplink reference signal, so that when a transmission error occurs, the network device cannot determine The transmission error is a transmission error caused by a poor channel condition, or a transmission error caused by the terminal device not competing for a part of the time unit of the first time-frequency resource located at the front end. In this case, by causing the network device to determine for the uplink The RV used for data retransmission is 0, which can reduce the impact on the uplink transmission due to the inability to determine the retransmission error.

With reference to the first aspect and the foregoing implementation manner, in an eighth implementation manner of the first aspect, when the first time unit includes a last one of the at least two time units, the method further includes: if the bearer If the receiving of the uplink data on the second time unit is incorrect, the network device discards the uplink data, where the second time unit includes a time unit of the at least two time units except the first time unit.

When the terminal device sends the uplink reference signal through the last time unit in the first time-frequency resource, the network device cannot determine the starting position of the uplink transmission by using the uplink reference signal, so that when a transmission error occurs, the network device cannot determine The transmission error is a transmission error caused by a poor channel condition, or a transmission error caused by the terminal device not competing to a part of the time unit of the first time-frequency resource located at the front end. In this case, a transmission error occurs by causing the network device to discard. The soft bits of the uplink data can prevent the soft buffer on the network device side from being polluted, thereby reducing the impact on the uplink transmission due to the inability to determine the retransmission error.

With reference to the first aspect and the foregoing implementation manner, in a ninth implementation manner of the first aspect, when the first time unit includes a last one of the at least two time units, the method further includes: the network The device receives uplink control information sent by the terminal device, where the uplink control information is carried in a last one of the at least two time units.

The uplink reference signal and the uplink control information are sent by the terminal device through the last time unit of the first time-frequency resource, so that the transmission of the uplink reference signal can be ensured, thereby ensuring that the network device receives the uplink control information based on the uplink reference signal. Processing, for example, demodulation decoding or the like, can improve the accuracy and reliability of transmission of uplink control information.

A second aspect provides a method for transmitting an uplink reference signal, where the method includes: determining, by a terminal device, a first time-frequency resource allocated by the network device for uplink transmission, where the first time-frequency resource includes at least two in a time domain. Time list And the first time-frequency resource is a time-frequency resource used by the terminal device in a contention manner; the terminal device determines the first time unit from the at least two time units, where the first time unit includes the at least two a last time unit in the time unit, or the first time unit includes a first time unit of the at least two time units that the terminal device can use; the terminal device transmits an uplink reference signal on the first time unit .

With reference to the second aspect, in a first implementation manner of the second aspect, the first time-frequency resource belongs to an unlicensed frequency band in a frequency domain.

With reference to the second aspect and the foregoing implementation manner, in the second implementation manner of the second aspect, when the first time unit includes the first time unit that the terminal device can use in the at least two time units, The uplink reference signal is carried in the first symbol of the first time unit that the terminal device can use.

With reference to the second aspect and the foregoing implementation manner, in a third implementation manner of the second aspect, the terminal device determines the first time unit from the at least two time units, including: the terminal device receives the sending by the network device First indication information, the first indication information is used to indicate that the terminal device uses the first time unit that is available to the terminal device in the at least two time units as the first time unit, and the terminal device is configured according to the first indication Information, the first time unit that can be used by the terminal device in the at least two time units as the first time unit; or the terminal device receives second indication information sent by the network device, where the second indication information is used for Instructing the terminal device to use the first time unit of the at least two time units as the first time unit, and the terminal device is configured to use the first device in the at least two time units according to the second indication information. The time unit is the first time unit.

With reference to the second aspect and the foregoing implementation manner, in a fourth implementation manner of the second aspect, the first indication information or the second indication information is that the network device determines at least one time of the at least two time units The unit is sent after the maximum channel occupation time MCOT that the network device can use.

When some or all of the time units of the first time-frequency resource terminal allocated by the network device to the terminal device belong to the MCOT used by the network device, the terminal device may use a resource competition mode with higher priority, so that the terminal device competes for the The first time unit of the first time-frequency resource is more likely. In this case, the uplink reference signal is transmitted by causing the network device to instruct the terminal device to send the uplink reference signal on the first time unit that is contending. And it is advantageous for the network device to detect or demodulate the uplink reference signal as early as possible, thereby reducing the processing delay of the uplink transmission.

With reference to the second aspect and the foregoing implementation manner, in a fifth implementation manner of the second aspect, the determining, by the terminal device, the first time unit from the at least two time units, Third finger The third indication information is used to indicate that the terminal device uses the last time unit of the at least two time units as the first time unit; the terminal device, according to the third indication information, the at least two times The last time unit in the unit acts as the first time unit.

With reference to the second aspect and the foregoing implementation manner, in a sixth implementation manner of the second aspect, the third indication information is that the network device determines that the at least one time unit of the at least two time units does not belong to the network device Can be used after the MCOT can be sent.

With reference to the second aspect and the foregoing implementation manner, in a seventh implementation manner of the second aspect, when the first time unit includes a last one of the at least two time units, the method further includes: the terminal The device transmits uplink control information to the network device on the last one of the at least two time units.

In a third aspect, an apparatus for receiving an uplink reference signal is provided, comprising means for performing the steps of the method of receiving the uplink reference signal in the first aspect and the implementations of the first aspect.

In a fourth aspect, an apparatus for transmitting an uplink reference signal is provided, comprising means for performing the steps of the method for transmitting an uplink reference signal in the implementations of the second aspect and the second aspect described above.

A fifth aspect provides an apparatus for receiving an uplink reference signal, comprising a memory and a processor, the memory being configured to store a computer program, the processor for calling and running the computer program from the memory, such that the network device performs the first A method of receiving an uplink reference signal in any of the aspects and various implementations thereof.

A sixth aspect provides an apparatus for transmitting an uplink reference signal, comprising: a memory and a processor, the memory for storing a computer program, the processor for calling and running the computer program from the memory, so that the terminal device performs the second A method of receiving an uplink reference signal in any of the aspects and various implementations thereof.

In a seventh aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is run by a processing unit, a sending unit or a processor of a network device, or a transmitter, causing the network device A method of performing an uplink reference signal by performing any of the above first aspects and various implementations thereof.

In an eighth aspect, a computer program product is provided, the computer program product comprising: computer program code, when the computer program code is run by a receiving unit, a processing unit or a receiver of the terminal device, or a processor, causing the terminal device A method of transmitting an uplink reference signal by performing any of the above second aspects and various implementations thereof.

In a ninth aspect, a computer readable storage medium is provided, the computer readable storage medium storing a program, the program causing a network device to perform any of the first aspect and various implementations thereof to receive an uplink reference Signal method.

According to a tenth aspect, a computer readable storage medium is provided, the computer readable storage medium storing a program, the program causing the terminal device to perform any one of the second aspect and various implementation manners thereof to send an uplink reference Letter Number method.

DRAWINGS

1 is a schematic architectural diagram of a communication system of a method and apparatus for transmitting or receiving an uplink reference signal according to an embodiment of the present application.

FIG. 2 is a schematic interaction diagram of an example of a transmission process of an uplink reference signal according to an embodiment of the present application.

FIG. 3 is a schematic diagram of an example of a location of a time unit carrying an uplink reference signal according to an embodiment of the present application.

4 is a schematic diagram of another example of a location of a time unit carrying an uplink reference signal according to an embodiment of the present application.

FIG. 5 is a schematic diagram of a DMRS subframe according to an embodiment of the present application.

FIG. 6 is a schematic interaction diagram of an example of a transmission process of downlink data according to an embodiment of the present application.

FIG. 7 is a schematic block diagram of an example of an apparatus for receiving an uplink reference signal according to an embodiment of the present application.

FIG. 8 is a schematic block diagram of another example of an apparatus for transmitting an uplink reference signal according to an embodiment of the present application.

FIG. 9 is a schematic block diagram showing an example of an apparatus for transmitting downlink data according to an embodiment of the present application.

FIG. 10 is a schematic block diagram of another example of an apparatus for receiving downlink data according to an embodiment of the present application.

detailed description

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

The terms "component," "module," "system," and the like, as used in this specification, are used to mean a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and a computing device can be a component. One or more components can reside within a process and/or execution thread, and the components can be located on one computer and/or distributed between two or more computers. Moreover, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on signals having one or more data packets (eg, data from two components interacting with another component between the local system, the distributed system, and/or the network, such as the Internet interacting with other systems) Communicate through local and/or remote processes.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, and a wideband code. Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE) A) System, Universal Mobile Telecommunication System (UMTS) or next generation communication system.

In general, traditional communication systems support a limited number of connections and are easy to implement. However, with the evolution of communication technologies, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device (Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), and Vehicle to Vehicle (V2V) communication.

The embodiments of the present application describe various embodiments in connection with a terminal device. A terminal device may also be called a user equipment (User Equipment, UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, Mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device may be a station (STAION, ST) in a Wireless Local Area Networks (WLAN), and may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, or a wireless local loop (Wireless Local) Loop, WLL) stations, Personal Digital Assistant (PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, and next-generation communication systems, For example, a terminal device in a fifth-generation (5G) network or a terminal device in a future evolved public land mobile network (PLMN) network.

By way of example and not limitation, in the embodiment of the present application, the terminal device may also be a wearable device. A wearable device, which can also be called a wearable smart device, is a general term for applying wearable technology to intelligently design and wear wearable devices such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are more than just a hardware device, but they also implement powerful functions through software support, data interaction, and cloud interaction. Generalized wearable smart devices include full-featured, large-size, non-reliable smartphones for full or partial functions, such as smart watches or smart glasses, and focus on only one type of application, and need to work with other devices such as smartphones. Use, such as various smart bracelets for smart signs monitoring, smart jewelry, etc.

Moreover, embodiments of the present application describe various embodiments in connection with network devices. The network device may be a device for communicating with the mobile device, such as a network device, and the network device may be an access point (APCESS POINT, AP) in the WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA, or may be A base station (NodeB, NB) in WCDMA may also be an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or an access point, or an in-vehicle device, a wearable device, and a network in a future 5G network. A device or a network device in a future evolved PLMN network.

In addition, in the embodiment of the present application, the terminal device may perform wireless communication in a cell, where the cell may be a cell corresponding to the network device (for example, a base station), and the cell may belong to the macro base station, or may belong to a small cell (small cell). The base station, where the small cell may include: a metro cell, a micro cell, a pico cell, a femto cell, etc., these small cells have small coverage and low transmission power. The features are suitable for providing high-speed data transmission services.

In addition, multiple carriers can work at the same frequency on the carrier in the LTE system. In some special scenarios, the concept of the carrier and the cell in the LTE system can be considered to be equivalent. For example, in a carrier aggregation (CA) scenario, when a secondary carrier is configured for a UE, the carrier index of the secondary carrier and the cell identifier (Cell ID) of the secondary cell working in the secondary carrier are simultaneously carried. In this case, the concept of the carrier and the cell can be considered to be equivalent, for example, the UE accessing one carrier and accessing one cell are equivalent.

The method and apparatus provided by the embodiments of the present application may be applied to a terminal device or a network device, where the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. . The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and a memory (also referred to as main memory). The operating system may be any one or more computer operating systems that implement business processing through a process, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, contacts, word processing software, and instant messaging software. Moreover, in the embodiment of the present application, wireless communication The specific structure of the execution subject of the method is not particularly limited as long as it can be performed by the method of wireless communication according to the embodiment of the present application by running a program for recording the code of the method of wireless communication of the embodiment of the present application. For example, the execution body of the method for wireless communication in the embodiment of the present application may be a terminal device or a network device, or a functional module that can call a program and execute a program in the terminal device or the network device.

Furthermore, various aspects or features of embodiments of the present application can be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or media. For example, the computer readable medium may include, but is not limited to, a magnetic storage device (eg, a hard disk, a floppy disk, or a magnetic tape, etc.), such as a compact disc (CD), a digital versatile disc (Digital Versatile Disc, DVD). Etc.), smart cards and flash memory devices (eg, Erasable Programmable Read-Only Memory (EPROM), cards, sticks or key drivers, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, without limitation, a wireless channel and various other mediums capable of storing, containing, and/or carrying instructions and/or data.

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

antennas

104, 106, 108, 110, 112, and 114. Additionally, network device 102 may additionally include a transmitter chain and a receiver chain, as will be understood by those of ordinary skill in the art, which may include multiple components related to signal transmission and reception (eg, processor, modulator, multiplexer) , demodulator, demultiplexer or antenna, etc.).

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

terminal device

116 or 122.

Terminal devices

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

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

antennas

112 and 114, wherein

antennas

112 and 114 transmit information to terminal device 116 over a forward link (also referred to as downlink) 118 and through the reverse link (also Information referred to as uplink 120 receives information from terminal device 116. In addition, terminal device 122 is in communication with

antennas

104 and 106, wherein

antennas

104 and 106 transmit information to terminal device 122 over forward link 124 and receive information from terminal device 122 over reverse link 126.

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

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

Each antenna (or set of antennas consisting of multiple antennas) and/or regions designed for communication is referred to as a sector of network device 102. For example, the antenna group can be designed to communicate with terminal devices in sectors of the network device 102 coverage area. The network device can transmit signals to all of the terminal devices in its corresponding sector through a single antenna or multiple antenna transmit diversity. In the course of network device 102 communicating with

terminal devices

116 and 122 via

forward links

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

forward links

118 and 124. In addition, the manner in which the network device transmits signals to all of its terminal devices through single antenna or multi-antenna transmit diversity In contrast, when the network device 102 utilizes beamforming to transmit signals to the randomly dispersed

terminal devices

116 and 122 in the associated coverage area, the mobile devices in the neighboring cells may experience less interference.

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

In addition, the communication system 100 can be a PLMN network or a D2D network or an M2M network or other network. FIG. 1 is only a simplified schematic diagram of an example, and other network devices may also be included in the network, which are not shown in FIG.

Hereinafter, time-frequency resources for wireless communication used by the communication system 100 will be described in detail.

In the embodiment of the present application, the time domain resource used by the network device and the terminal device to transmit information may be divided into multiple time units in the time domain.

Moreover, in the embodiment of the present application, the plurality of time units may be continuous, or a preset interval may be provided between some adjacent time units, which is not specifically limited in the embodiment of the present application.

In this embodiment of the present application, the time unit may be a time unit including transmission for uplink information (eg, uplink data) and/or downlink information (eg, downlink data).

In the embodiment of the present application, the length of one time unit can be arbitrarily set, and the embodiment of the present application is not particularly limited.

For example, one time unit may include one or more subframes.

Alternatively, one time unit may include one or more time slots.

Alternatively, one time unit may include one or more symbols.

Alternatively, one time unit may include one or more Transmission Time Intervals (TTIs).

Alternatively, one time unit may include one or more short transmission time intervals (sTTIs).

In the embodiment of the present application, the time-frequency resource used by the communication system 100 for wireless communication may be divided into multiple TTIs in the time domain, and the TTI is a commonly used parameter in the current communication system (for example, an LTE system). Refers to the scheduling unit that schedules data transmissions in the wireless link. In the prior art, 1 TTI = 1 ms is generally considered. That is, one TTI is a subframe or the size of two slots, which is the basic unit of time governed by radio resource management (scheduling, etc.).

In communication networks, latency is a key performance indicator that also affects the user experience. With the development of communication protocols, the scheduling interval of the physical layer that has the most obvious impact on delay is getting smaller and smaller. In the original WCDMA, the scheduling interval is 10ms, and High-Speed Packet Access (HSPA) is used. The scheduling interval is shortened to 2ms, and the scheduling interval (ie, TTI) in Long Term Evolution (LTE) is shortened to 1ms.

The hourly service requirement causes the physical layer to introduce a shorter TTI frame structure to further shorten the scheduling interval and improve the user experience. For example, the TTI length in an LTE system can be shortened from 1 ms to 1 symbol (symbol) to 1 slot (including 7 symbols). The symbols mentioned above may be Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbols in an LTE system, and may also be Is a symbol in other communication systems. For another example, the length of the TTI in the 5G communication system is also less than 1 ms.

In the data transmission based on the TTI of 1 ms in the LTE system, the Round-Trip Time (RTT) of the data transmission is generally 8 ms. It is assumed that the processing time is proportionally reduced compared to the scheduling of an existing TTI of 1 ms in length, that is, the existing RTT delay is still followed. Then, in the data transmission based on the sTTI of 0.5 ms in length, the RTT of the data transmission is 4 ms, and the delay can be shortened by half relative to the data transmission based on the TTI of 1 ms in length, thereby improving the user experience.

A TTI having a length of less than 1 ms may be referred to as an sTTI. For example, in an LTE system, the length of the sTTI may be any one of 1 to 7 symbols, or the sTTI length may be a combination of at least 2 different lengths of 1 to 7 symbols, for example, 6 sTTIs in 1 ms. Each sTTI length may be 3 symbols, 2 symbols, 2 symbols, 2 symbols, 2 symbols, 3 symbols, or 4 sTTIs in 1 ms, and each sTTI length may be 3 symbols, respectively. 4 symbols, 3 symbols, 4 symbols, each sTTI length can also be a combination of other different lengths.

Moreover, the uplink sTTI length may be the same as the downlink sTTI length. For example, the uplink sTTI length and the downlink sTTI length are both symbols.

Alternatively, the uplink sTTI length may be longer than the downlink sTTI length. For example, the uplink sTTI length is 7 symbols, and the downlink sTTI length is 2 symbols.

Alternatively, the uplink sTTI length may be shorter than the downlink sTTI length. For example, the uplink sTTI length is 4 symbols, and the downlink sTTI length is 1 subframe.

A packet whose TTI length is less than 1 subframe or 1 ms is called a short TTI packet. Short TTI data transmission is in the frequency domain and can be continuously distributed or non-continuously distributed. It should be noted that, considering backward compatibility, there may be cases in which data transmission based on TTI with a length of 1 ms and data transmission based on sTTI may exist at the same time.

In the embodiment of the present application, the TTI and the sTTI specified by the prior art (for example, the LTE system) (for example, the length is 1 ms or the length is greater than 1 ms) are collectively referred to as the TTI, and, in the embodiment of the present application, the length of the TTI. It can be changed according to actual needs.

It should be understood that the structure of the time unit enumerated above is only an exemplary description, and the embodiment of the present application is not particularly limited, and the structure of the time unit may be arbitrarily changed according to actual needs, for example, for an LTE system that does not support sTTI, One time unit can be one subframe (Subframe). For another example, for an LTE system supporting sTTI, one time unit may include one sTTI, or one time unit may include one slot (slot), and one time unit may include one or more ( For example, a positive integer number less than 7 or a positive integer number less than 6; one time unit may also be 1 subframe.

It should be noted that, in the embodiment of the present application, the length of the time unit for information transmission (or the information transmission duration) may be 1 ms or less than 1 ms. Or, in combination with the above description, even for an LTE system that does not support sTTI, when the time unit is represented by a subframe, the length of the downlink information transmission in the time unit may be 1 ms or less than 1 ms, and similarly, The length of the uplink information transmission in the time unit may be 1 ms or less than 1 ms.

Hereinafter, for the sake of easy understanding, the transmission process of the uplink reference signal of the present application will be described by taking a case where one time unit includes one sTTI as an example.

In addition, in the embodiment of the present application, the time-frequency resource (for example, the first time-frequency resource) used by the network device and the terminal device to perform uplink transmission includes at least two time units.

In the embodiment of the present application, the time domain resource used by the network device and the terminal device to transmit information is a time-frequency resource used by the contention mechanism, that is, the terminal device can detect whether a certain time-frequency resource is currently in an idle state, or Whether the time-frequency resource is used by another device, and if the time-frequency resource is in an idle state, or the time-frequency resource is not used by another device, the terminal device can use the time-frequency resource to perform communication, for example, performing uplink transmission, and the like; If the time-frequency resource is not in an idle state, or the time-frequency resource is used by another device, the terminal device cannot use the time-frequency resource. It should be noted that, in the embodiment of the present application, the specific method and process of the foregoing competition mechanism may be similar to the prior art. Here, in order to avoid redundancy, detailed description thereof is omitted.

In the embodiment of the present application, the time-frequency resource used by the communication system 100 (or the time-frequency resource used by the network device and the terminal device based on the contention mechanism) may be a licensed time-frequency resource or an unlicensed time-frequency resource. The embodiment of the present application is not particularly limited. In the embodiment of the present application, each communication device (for example, a network device or a terminal device) in the communication system 100 may use time-frequency resources for communication based on the unscheduled transmission scheme, or may use time-frequency resources for communication based on the scheduling mode. The application examples are not particularly limited.

Unlicensed time-frequency resources refer to resources that each communication device can share using the unlicensed time-frequency domain. Resource sharing on the unlicensed band means that the use of a specific spectrum only specifies the limits of the transmit power and out-of-band leakage to ensure that the basic coexistence requirements are met between multiple devices sharing the band. The licensed band resources can achieve the purpose of network capacity shunting, but need to comply with the regulatory requirements of the unlicensed band resources in different geographies and different spectrums. These requirements are usually designed to protect public systems such as radar, as well as to ensure that multiple systems do not cause harmful effects and fair coexistence with each other, including emission power limits, out-of-band leak indicators, indoor and outdoor use restrictions, and areas. There are also some additional coexistence strategies and so on. For example, each communication device can adopt a contention mode or a monitoring mode, for example, a time-frequency resource used in a manner specified by Listening Before Talk (LBT).

In the embodiment of the present application, the transmission of data may be based on network device scheduling, and the scheduled basic time unit is one or more TTIs (for example, including the above sTTI). The specific scheduling procedure is that the base station sends a control channel, for example, a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (EPDCCH) or a physical downlink control channel for scheduling sTTI transmission. (sTTI Physical Downlink Control Channel, sPDCCH), the control channel may be configured to use a Downlink Control Information (DCI) format for scheduling a Physical Downlink Shared Channel (PDSCH) or a Physical Uplink Shared Channel. Scheduling information of (Physical Uplink Shared Channel, PUSCH), the scheduling information includes control information such as resource allocation information, modulation and coding mode, and the like. The terminal device detects the control channel, and performs downlink data channel reception or uplink data channel transmission according to the detected scheduling information carried in the control channel. After the sTTI technology is introduced, the scheduling information carried in the control channel may indicate downlink data channel reception or uplink data channel transmission with a TTI length of 1 ms or a TTI length of less than 1 ms.

In order to solve a large number of MTC-type services in the future network, and to meet low-latency, highly reliable service transmission, a schedule-free transmission scheme can be used. In the embodiment of the present application, the transmission of data may also be unscheduled. Unscheduled transmission English can be expressed as Grant Free. The schedule-free transmission here can be for uplink data transmission or downlink data transmission. The unscheduled transmission can be understood as any meaning of the following meanings, or multiple meanings, or a combination of some of the various technical features or other similar meanings:

The unscheduled transmission may be: the network device pre-allocates and informs the terminal device of multiple transmission resources; when the terminal device has an uplink data transmission requirement, select at least one transmission resource from the plurality of transmission resources pre-allocated by the network device, and use the selected transmission. The resource sends uplink data; the network device detects uplink data sent by the terminal device on one or more of the pre-assigned multiple transmission resources. The detection may be blind detection or may be based on the above A certain control domain in the row data is detected, or is detected in other ways.

The unscheduled transmission may be: the network device pre-allocates and informs the terminal device of multiple transmission resources, so that when the terminal device has an uplink data transmission requirement, at least one transmission resource is selected from a plurality of transmission resources pre-allocated by the network device, and the selected one is used. The transmission resource sends uplink data.

The unscheduled transmission may be: acquiring information of a plurality of pre-assigned transmission resources, selecting at least one transmission resource from the plurality of transmission resources when the uplink data transmission request is required, and transmitting the uplink data by using the selected transmission resource. The method of obtaining can be obtained from a network device.

The unscheduled transmission may refer to a method for implementing uplink data transmission of the terminal device without dynamic scheduling of the network device, where the dynamic scheduling may refer to that the network device indicates the transmission resource by signaling for each uplink data transmission of the terminal device. A scheduling method. Optionally, implementing uplink data transmission of the terminal device may be understood as allowing data of two or more terminal devices to perform uplink data transmission on the same time-frequency resource. Optionally, the transmission resource may be a transmission resource of one or more transmission time units after the time when the terminal device receives the signaling. A transmission time unit can refer to a minimum time unit of one transmission, such as a TTI.

The unscheduled transmission may refer to: the terminal device performs uplink data transmission without requiring network device scheduling. The scheduling may be performed by the terminal device sending an uplink scheduling request to the network device, and after receiving the scheduling request, the network device sends an uplink grant to the terminal device, where the uplink grant indicates an uplink transmission resource allocated to the terminal device.

The unscheduled transmission may be a competitive transmission mode. Specifically, multiple terminals may simultaneously perform uplink data transmission on the same time-frequency resources allocated in advance without performing scheduling by the base station.

The data may be included in service data or signaling data.

The blind detection can be understood as the detection of data that may arrive without predicting whether or not data has arrived. The blind detection can also be understood as detection without explicit signaling indication.

In this embodiment of the present application, the basic time unit of the unscheduled transmission may be one TTI (for example, including the above sTTI). After the introduction of the sTTI technology, the unscheduled transmission may include downlink data channel reception or uplink data channel transmission with a TTI length of 1 ms or a TTI length of less than 1 ms.

By way of example and not limitation, in the embodiment of the present application, the unlicensed spectrum resource may include a frequency band near 5 GHz, a frequency band near 2.4 GHz, a frequency band near 3.5 GHz, and a frequency band near 60 GHz.

By way of example and not limitation, for example, the communication system 100 may employ a Licensed-Assisted Access Using LTE (LAA-LTE) technology on an unlicensed carrier, or may support the independent deployment of the communication system in an unlicensed band. Technology such as Standalone LTE over unlicensed spectrum, or LTE-U (LTE Advanced in Unlicensed Spectrums, LTE-U) technology, that is, the communication system 100 can independently deploy the LTE system to the unlicensed band, and thus in the unlicensed band. Communication is completed using the LTE air interface protocol, which does not include licensed bands. The LTE system deployed in the unlicensed band can utilize technologies such as centralized scheduling, interference coordination, and hybrid automatic repeat reQuest (HARQ). Compared with access technologies such as Wi-Fi, the technology has better technology. Great, you can achieve higher spectral efficiency, provide greater coverage and a better user experience.

Moreover, by way of example and not limitation, in the embodiment of the present application, the communication system 100 may employ, for example, Licensed-Assisted Access (LAA), Dual Connectivity (DC), and license-free access ( Standalone) technology. The LAA includes the configuration and structure of Carrier Aggregation (CA) in the existing LTE system to configure the carrier (licensed carrier) on the carrier licensed band to communicate. Based on the letter, the carrier on multiple unlicensed bands (unlicensed carrier) is configured and the licensed carrier is used as an auxiliary to communicate using the unlicensed carrier. That is, the LTE device can use the licensed carrier as the primary component carrier (PCC) or the primary cell (PCell) in the CA mode, and use the unlicensed carrier as the secondary component carrier (SCC). Or secondary cell (Secondary Cell, SCell). The dual connectivity DC technology includes a technique of jointly using a licensed carrier and an unlicensed carrier in a non-CA (or non-ideal backhaul) manner, or a technique of jointly using a plurality of unlicensed carriers in a non-CA manner. LTE devices can also be deployed directly on unlicensed carriers through independent deployment.

In the embodiment of the present application, the time-frequency resource used by the communication system 100 (or the time-frequency resource used by the network device and the terminal device based on the contention mechanism) may be a licensed spectrum resource, that is, the communication system of the embodiment of the present application. 100 is a communication system capable of using a licensed frequency band, and each terminal device within the system 100 can use the time-frequency resources of the licensed frequency band in a competitive manner.

Permitted time-frequency resources generally require time-frequency resources that can be used by national or local wireless committees for approval. Different systems, such as LTE systems and WiFi systems, or systems included by different operators may not share licensed time-frequency resources.

In addition, in some embodiments of the embodiments of the present application, the network device can provide one or more license-free cells (or may also be referred to as an unlicensed carrier), and one or more licensed cells (or, also may be called For the carrier carrier).

In addition, it should be noted that the information transmission of the LTE system on the unlicensed band may have no fixed frame structure. In summary, an access network device, such as a base station or a cell, may determine the transmission duration and/or uplink information of the downlink information after preempting the unlicensed spectrum resource according to the downlink traffic load and/or the uplink traffic load, or other considerations. The length of the transmission. Further, the access network device can flexibly adjust the number of time units (ie, downlink time units) including downlink information, and the number of time units (including uplink time units) including uplink information, after preempting the unlicensed spectrum resources. The transmission duration of the downlink information included in each downlink time unit and the transmission duration of the uplink information included in each uplink time unit.

Moreover, the concept of Transmission Opportunity (TxOP) is introduced in the frame structure of the LTE system in the unlicensed band. The transmission opportunity may also be referred to as a transmission burst (Transmission Burst), and a TxOP may include a downlink burst transmission. (Downlink Transmission Burst, DL Transmission Burst) and/or Uplink Transmission Burst (UL Transmission Burst).

The downlink burst transmission (which may also be referred to as “downlink burst data transmission” or “downlink burst information transmission”) may include: an access network device (for example, an eNB) or a cell under the access network device (Cell) After the preemption of the unlicensed band resources, the information transmission (or data transmission) using the unlicensed band resources is not required to pass through a competition mechanism (for example, LBT). The length of a downlink burst transmission is not greater than the maximum time that the access network device (or the cell) can continuously transmit through the contention mechanism on the unlicensed band resource, and the maximum time may also be referred to as a maximum channel. Occupied time (MCOT, Maximum Channel Occupied Time). The length of the MCOT can be related to regional regulatory constraints. For example, in Japan, MCOT can be equal to 4ms; in Europe, MCOT can be equal to 8ms, or 10ms, or 13ms. Alternatively, the length of the MCOT may also be related to the competition mechanism used by the listening device (for example, the access network device or the terminal device). Generally, the shorter the listening time, the shorter the MCOT. Or, the length of the MCOT can also be related to the level of service transmitted. In the embodiment of the present application, the MCOT may also be determined by other factors, and is not specifically limited.

It should be noted that in the above description, “the unlicensed band is utilized in a manner that does not require a competition mechanism. The information transmission by the resource may include: after the access network device or the cell preempts the unlicensed band resource, within the time when the information is actually transmitted on the unlicensed band resource or within the MCOT, the competition mechanism does not need to be evaluated again. Whether the unlicensed band resource is available. For example, taking the downlink burst transmission included in the first TxOP as an example, starting from the second subframe in the downlink burst transmission, the base station does not need to evaluate the license exemption through the competition mechanism. Whether the band resource is available. In other words, before the downlink burst data transmission, the unlicensed spectrum resource needs to be determined, and once the downlink burst starts to be transmitted, the availability of the unlicensed spectrum resource may not be re-evaluated until the The downlink burst data transmission ends.

Or, "using information transmission by using the unlicensed band resource in a manner that does not need to pass the competition mechanism" may further include: after the access network device or the cell preempts the unlicensed band resource, actually on the unlicensed band resource During the time of sending the information or within the MCOT, the competition mechanism may be adopted without considering coexistence with the different systems, but the competition mechanism may be considered in consideration of coexistence with the same system. Here, the competition mechanism adopted for coexistence with the system, The method may include including, after the preemption of the unlicensed band resource, a time unit (or an idle time unit) in the time when the information is sent or the MCOT, in which the base station or the cell may stop the information transmission. (or may stop transmitting information), in this particular time unit, the base station or the cell may perform channel sounding to re-evaluate whether the unlicensed spectrum resource is available, or may not perform channel sensing in a specific time unit. Continue to send the message at the time the message was sent or within the MCOT. For example, from the time range from the start to the end of the downlink burst transmission, the access network device can stop transmitting information for a period of time at any time position. Here, for the LTE system, the non-LTE system can be regarded as a different system, such as a wireless local area network (WLAN) system, or a system using WiFi (Wireless Fidelity) technology; the LTE system can be regarded as The same system, whether it is an LTE system belonging to the same operator or an LTE system belonging to different operators, can be regarded as the same system. Here, the LTE system includes a base station and/or a terminal device.

Similarly, uplink burst transmission (also referred to as "uplink burst data transmission" or "uplink burst information transmission") may include: after the terminal device preempts the unlicensed band resource, it does not need to compete again. The mechanism (eg, LBT) uses the information transfer of the unlicensed band resources. For a single terminal device, the length of the uplink burst transmission may not be greater than the MCOT on the unlicensed band resource, or the length of the uplink burst transmission may be otherwise limited. The uplink burst transmission may include information transmission of a single user, and may also include information transmission of multiple users. From the access network device side, the uplink burst transmission may be an uplink information transmission included in the TxOP.

In addition, the understanding of the information transmission by using the unlicensed band resource in a manner that does not need to pass the contention mechanism is also the same as that of the access network device side, and details are not described herein.

For the terminal device, the same system can also be understood as a terminal device having the same serving cell or service access network device as the terminal device. The uplink burst transmission further includes: after the access network device preempts the unlicensed band resource, based on a specific time delay within a time range in which the access network device does not need to use the unlicensed band to transmit information through a competition mechanism ( For example, based on a 4 ms time delay, information transmission by the terminal device from the first uplink subframe that can be scheduled to the last uplink subframe that can be scheduled, for example, from the first uplink subframe to the last one. The time range between uplink subframes is the time range corresponding to the uplink burst transmission. In this embodiment, the length of time that the uplink subframe that can be scheduled for uplink information transmission may be less than 1 ms.

In the embodiment of the present application, the length of a TxOP may not be greater than the maximum transmission time allowed by the downlink burst transmission, or not greater than the maximum transmission time allowed for the uplink burst transmission, or not greater than the downlink burst transmission permission. The sum of the maximum transmission time length and the maximum length of time allowed for uplink burst transmission, or one The length of the burst transmission may not be greater than the MCOT on the unlicensed band resource. For example, for a given device, whether it is an access network device or a terminal device, or other devices, after preempting the unlicensed band resources, the maximum length of time that data can be transmitted through the contention mechanism is 8 ms (corresponding to the above). The mentioned MCOT), that is, a TxOP even includes both the DL transmission burst and the UL transmission burst, and the maximum transmission time length of one TxOP (or Transmission Burst) is also 8 ms. Thus, the uplink burst transmission may employ a competition mechanism that facilitates the terminal device to preempt (or compete) the unlicensed band resources.

As described above, the information transmission of the LTE system on the unlicensed band has no fixed frame structure, and may include at least one of the following: different downlink burst transmissions may have different durations, and different uplink burst transmissions may have different durations. The length of the downlink burst transmission included in the TxOP (which may be adjacent or non-adjacent) may be different. The length of the uplink burst transmission included in different TxOPs may be different, and the duration of different TxOPs may be different. In the embodiment of the present application, the duration of the downlink burst transmission includes a length of time from a start time of the downlink burst to an end time of the downlink burst; the duration of the uplink burst transmission includes: The length of time between the start time and the end time of the upstream burst.

In the embodiment of the present application, the uplink transmission may include uplink burst transmission, which is simply referred to as “uplink burst”. Before performing the uplink transmission, the terminal device needs to confirm whether the time-frequency resources scheduled by the network device (for example, the resources on the unlicensed frequency band scheduled by the network device) are available by using, for example, LBT, and the specific location of the LBT, The application is not subject to specific restrictions.

In the embodiment of the present application, one uplink burst transmission may include one or more time units.

Moreover, when an uplink burst transmission includes multiple time units, the plurality of time units in the uplink burst transmission may be continuous or non-contiguous (eg, some adjacent time units are separated by time intervals) The embodiment of the present application is not particularly limited.

Optionally, in each of the plurality of consecutive time units included in each uplink burst transmission, each time unit has the same length of time.

That is, in the embodiment of the present application, each time unit in one uplink burst transmission may be a time unit including the same number of symbols.

For example, the length of each time unit in an uplink burst transmission is one subframe.

For another example, each time unit in an uplink burst transmission has a length of 2 symbols.

Or, optionally, at least two of the plurality of consecutive time units included in each uplink burst transmission have different lengths of time.

That is, in the embodiment of the present application, at least two time units in each time unit in one uplink burst transmission include different number of symbols.

For example, the time length of a time unit other than the first time unit and/or the last time unit in an uplink burst transmission is 1 ms (ie, 1 subframe). Moreover, the length of the first time unit in an uplink burst transmission may be less than 1 ms; or, the length of the last time unit in an uplink burst transmission may be less than 1 ms; or, in an uplink burst transmission The length of time between the first time unit and the last time unit is less than 1 ms. It should be noted that the length of time of the first time unit and the last time unit may be the same or different.

For another example, the time length of one time unit in an uplink burst transmission may be any positive integer number of symbols less than 8, for example, one uplink burst transmission includes 6 time units, and each time unit corresponds to a length of time 3 Symbol, 2 symbols, 2 symbols, 2 symbols, 2 symbols, 3 symbols.

In the embodiment of the present application, the time unit in a burst transmission may be used to transmit data of one terminal device, and may also be used to transmit data of multiple terminal devices, which is not specifically limited in the embodiment of the present application, for example, the same connection. The plurality of terminal devices served by the network access device may receive the time unit sent by the access network device by means of frequency division multiplexing or time division multiplexing or space division multiplexing or code division multiplexing. data. For example, a plurality of terminal devices served by the same access network device may use a time unit in a burst transmission by means of frequency division multiplexing or time division multiplexing or space division multiplexing or code division multiplexing. The network access device sends data.

In the embodiment of the present application, each burst transmission may be pre-divided (or statically or semi-statically configured), that is, the high-level management equipment of each burst transmission communication system divides and notifies each access network device, Alternatively, the division manner of each burst transmission may be specified by a communication protocol, or the division manner of each burst transmission may be pre-stored in each access network device by means of a factory setting or an administrator setting. For example, for the same unlicensed spectrum resource, each access network device can use the unlicensed spectrum resource in a time division multiplexing manner, and the specific time range of the corresponding time can be divided by the high-level management device, within the time range of the divided use. It is also necessary to use the unlicensed spectrum resource through channel evaluation.

Or, in the embodiment of the present application, each burst transmission may also be autonomously determined (or dynamically changed) by each access network device, that is, each access network device may determine a usable time unit in a competitive manner. And contiguous one or more time units are transmitted as one or more bursts, for example, the access network device can configure the plurality of competing time units in the same burst transmission.

The transmission process of the uplink reference signal in the embodiment of the present application is described in detail below with reference to FIG. 2 . FIG. 2 is a schematic interaction diagram of an example of a transmission process of an uplink reference signal according to an embodiment of the present application.

As shown in FIG. 2, in S210, the network device may allocate time-frequency resource #A (that is, an example of the first time-frequency resource) for performing uplink transmission for the terminal device #A (that is, an example of the terminal device).

The time-frequency resource #A includes two or more time units in the time domain. Hereinafter, for ease of understanding and explanation, the time unit included in the time-frequency resource #A is recorded as: time unit #1~ Time unit #N, N is an integer greater than one.

In addition, the time-frequency resource #A is a time-frequency resource used based on a contention mechanism, specifically, although the time unit #1 to the time unit #N (or the time-frequency resource #A) is a network device allocated to the terminal. Device #A, however, terminal device #A still needs to use the time unit #1 to time unit #N in a competitive manner, or terminal device #A can only use the time unit #1 to time unit #N The terminal device #A competes for (or preempts) the time-frequency resources.

For example, as an example and not by way of limitation, time-frequency resource #A may be a time-frequency resource on an unlicensed band.

It should be noted that, in the embodiment of the present application, the time unit #1 to the time unit #N may be consecutive, and some adjacent time units of the time unit #1 to the time unit #N may be spaced apart. One or more time units or symbols are not specifically limited herein.

In addition, in the embodiment of the present application, the time-frequency resource #A may be a time-frequency resource that the network device separately allocates to the terminal device #A; or the time-frequency resource #A may be allocated by the network device to include the terminal device. Multiple within #A The time-frequency resource of the terminal device is not limited in this embodiment.

In addition, in the embodiment of the present application, the time-frequency resource #A may be allocated by the network device to the terminal device #A after determining that the terminal device #A needs to perform uplink transmission; or the time-frequency resource #A may be a network device. For example, when the terminal device #A accesses the cell provided by the network device, it is allocated to the terminal device #A; or, the time-frequency resource #A may be a network device, for example, competing for the part provided by the communication system or The embodiment of the present application is not specifically limited in the case of all the unlicensed time-frequency resources, which are determined from the unlicensed time-frequency resources that are contending and allocated to the terminal device #A.

As an example and not by way of limitation, for example, the network device may send the indication information of the time-frequency resource #A to the terminal device #A through the resource scheduling information, so that the terminal device #A may determine that the time-frequency resource #A needs to be used. That is, the time-frequency resources that are contending in the time unit #1 to the time unit #N) are uplinked.

Or, for example, the start position of the time-frequency resource #A may have a corresponding relationship with the time-frequency resource used when the network device performs downlink transmission. For example, when the terminal device #A needs to perform uplink transmission, the network device may be currently performed. After the end of the downlink transmission (or after the last symbol used by the downlink transmission currently performed by the network device), the time domain position of the specified number of X symbols is used as the starting position of the time-frequency resource #A. The predetermined number X may be specified by a communication system or a communication protocol, or the predetermined number X may be notified to the terminal device #A by the network device, and the present application is not particularly limited.

Moreover, the size of the time-frequency resource #A (for example, the size on the time domain resource, specifically, the total number N of the time unit #1 to the time unit #N) may be related to the uplink required by the terminal device #A. The size of the time-frequency resource #A may also be a predetermined value Y, wherein the predetermined value Y may be specified by a communication system or a communication protocol, or the predetermined value Y may be a network device. The notification is not limited to the terminal device #A.

The size of the time-frequency resource #A in the frequency domain may be arbitrarily set according to requirements, and the size of the time-frequency resource #A in the frequency domain may be specified by a communication system or a communication protocol, or may be determined by the network device. The notification is not limited to the terminal device #A.

Thereby, the terminal device can determine the time-frequency resource #A. Specifically, the terminal device can determine each time unit included in the time domain of the time-frequency resource #A, that is, the time unit #1 to the time unit #N. Specifically, the terminal device can determine the total number and location of the time unit #1 to the time unit #N.

At S220, the terminal device #A may perform contention for the time-frequency resource #A (for example, time unit #1 to time unit #N) by using, for example, LBT or the like, from the time-frequency resource #A (for example, The time unit #1 to time unit #N) determine the time unit that the terminal device #A can use.

It should be noted that if the terminal device #A does not compete for any time unit, the uplink transmission cannot be performed, and the uplink reference signal cannot be transmitted. Therefore, in the case where the terminal device #A can perform uplink transmission, the terminal device #A can Competing with at least one of the time unit #1 to the time unit #N, that is, the terminal device #A can compete at least in the time unit #1 to the time unit #N in the case where the terminal device #A can perform uplink transmission. The last time unit, that is, time unit #N.

Hereinafter, in order to facilitate understanding and explanation, the time unit that is competed by the terminal device #A in the time unit #1 to the time unit #N is recorded as: time unit #α to time unit #N, where α is greater than or An integer equal to 1.

It should be noted that, in the embodiment of the present application, the time unit #α to the time unit #N may be consecutive, and some adjacent time units of the time unit #α to the time unit #N may be spaced apart. One or more time units or symbols are not specifically limited herein.

At S230, the terminal device #A may determine a time unit (ie, an example of the first time unit) for carrying the uplink reference signal from the time unit #α to the time unit #N that are contending, and hereinafter, for ease of understanding and It is to be noted that the time unit for carrying the uplink reference signal in the time unit #α to the time unit #N is denoted as: time unit #T.

It should be noted that, in the embodiment of the present application, the uplink reference signal includes a Demodulation Reference Signal (DMRS) for uplink channel demodulation, and a Sounding Reference Signal (Sounding Reference Signal) for uplink channel measurement. Any one or more of the signals such as SRS).

By way of example and not limitation, in the embodiment of the present application, the uplink reference signal is located on a time unit, that is, in the embodiment of the present application, only one time unit in the time unit #α to the time unit #N can carry the uplink. The reference signal, for example, the uplink reference signal can be used for demodulation of data on each time unit in time unit #α to time unit #N. The number of reference signal sequences included in the uplink reference signal is equal to the maximum number of layers of data transmission in the time unit #α to the time unit #N. For example, the maximum number of layers of data transmission in the time unit #α to the time unit #N is 2 layers, and then the uplink reference signal includes 2 reference signal sequences. It should be noted that when the uplink reference signal located on the same symbol includes multiple reference signal sequences, orthogonality between multiple reference signal sequences may be ensured by code division or frequency division or code division addition.

Or, in the embodiment of the present application, the uplink reference signal may be located on multiple time units, that is, in the embodiment of the present application, the time unit #α to the time unit #N may have multiple time units that can carry the uplink. a reference signal, for example, an uplink reference signal on one time unit may be used for demodulation of data on a partial time unit in time unit #α to time unit #N; or, an uplink reference signal on multiple time units may be combined Channel estimation is performed and used for demodulation of data on each time unit in time unit #α to time unit #N.

By way of example and not limitation, multiple uplink reference signals may be carried in multiple symbols that belong to the same time unit. For example, the demodulation reference signal and the sounding reference signal are simultaneously carried on the same time unit, wherein the demodulation reference signal and the sounding reference signal are located at different symbols.

In the embodiment of the present application, the time unit #T may be the time unit #α (ie, case 1), or the time unit #T may be the time unit #N (ie, case 2), below, respectively The two cases are described in detail.

Situation 1

Specifically, as shown in FIG. 3, in the embodiment of the present application, as the rule for determining the time unit #T, the following rule #1 can be cited.

Rule #1: The time unit #T may be the first time unit (in chronological order) that the terminal device #A in the time unit #1 to the time unit #N can compete for, that is, the time unit #α.

By way of example and not limitation, for example, the rule #1 may be specified by a communication system or a communication protocol, or the rule #1 may be a user input to the terminal device #A, or alternatively, the rule #1 may be a manufacturer or The telecommunications carrier is configured in terminal equipment #A.

For another example, the rule #1 may be determined by the terminal device #A based on the indication information (for example, the first indication information or the second indication information) from the network device.

Specifically, in the embodiment of the present application, the network device may use the indication information of the rule #1 (that is, an example of the first indication information), or is used to indicate that the terminal device #A will time unit #1 to time. The first time unit (ie, time unit #α) that the terminal device #A can compete for (in time order) in the unit #N as the indication information of the time unit #T (ie, another example of the first indication information) ) is sent to terminal device #A.

Thereby, the terminal device #A can determine, based on the first indication information, that the time unit #T is determined using the rule #1, ie, The terminal device #A may, based on the first indication information, the first time unit (i.e., time unit #α) that the terminal device #A in the time unit #1 to the time unit #N can compete for (in chronological order) ) as the time unit #T.

Alternatively, in the embodiment of the present application, the network device may be used to indicate that the terminal device #A sets the first time unit (in chronological order) in the time unit #1 to the time unit #N (ie, the time unit #1 The instruction information as the time unit #T (that is, an example of the second indication information) is transmitted to the terminal device #A.

Since the terminal device #A cannot ensure that the time unit #1 can be competed, when the terminal device #A receives the second indication information, the terminal device #A can determine to determine the time unit #T using the rule #1, that is, When the terminal device #A receives the second indication information, the terminal device #A may classify the first time unit (in chronological order) that the terminal device #A in the time unit #1 to the time unit #N can compete with (in chronological order) That is, the time unit #α) is taken as the time unit #T.

By way of example and not limitation, in the embodiment of the present application, the network device may determine that the terminal device #A can compete for one or more time units located in the front end (in chronological order) in the time unit #1 to the time unit #N ( For example, the probability (eg, probability) of the first time unit in time sequence in time unit #1 to time unit #N, and when the network device determines that the probability (eg, probability) is large, The first indication information or the second indication information is sent to the terminal device #A.

Also, by way of example and not limitation, the network device may determine the size of the above-described possibilities in the following manner.

Specifically, the network device may determine whether one or more time units of the time unit #1 to the time unit #N belong to the MCOT used by the network device, and if the determination result is “Yes”, the network device may determine the terminal. Device #A can compete in time unit #1 to time unit #N (in chronological order) one or more time units located at the front end (for example, chronological order in time unit #1 to time unit #N) The first time unit is more likely to be sent, so that the network device can deliver the first indication information or the second indication information to the terminal device #A.

That is, if the network device determines that one or more time units of the time unit #1 to the time unit #N belong to the MCOT used by the network device, the network device may send the first indication information to the terminal device #A or Second indication information.

It should be understood that the method and process for determining whether to send the first indication information or the second indication information by the network device enumerated above are merely exemplary. The application is not limited thereto. For example, the network device may also determine the time unit # 1 to time unit #N is the number of time units belonging to the MCOT used by the network device is greater than or equal to a preset threshold #1, and if the determination result is "Yes", the network device can determine that the terminal device #A can compete to One or more time units located in the front end in time unit #1 to time unit #N (in chronological order) (for example, the first time unit in chronological order in time unit #1 to time unit #N) The network device may send the first indication information or the second indication information to the terminal device #A. Further, the threshold #1 may be a value specified by the communication system or the communication protocol, or may be set by the manufacturer or the telecommunication operator in the network device, and the present application is not particularly limited.

For example, the network device may determine whether the time unit #1 to the time unit #N all belong to the MCOT used by the network device. If the determination result is “Yes”, the network device may determine that the terminal device uses the higher priority resource. Competing, so that it can be determined that the terminal device #A can compete for one or more time units located in the front end (in chronological order) in the time unit #1 to the time unit #N (for example, time unit #1 to time unit #N The first time unit in the chronological order is more likely, so that the network device can deliver the first indication information or the second indication information to the terminal device #A.

When the part or all of the first time-frequency resource terminals allocated by the network device to the terminal device belong to the MCOT used by the network device, the possibility that the terminal device competes for the first time unit in the first time-frequency resource Larger. In this case, by causing the network device to instruct the terminal device to send the uplink reference signal on the first time unit that is contending, the uplink reference signal is facilitated, and the network device is encouraged to detect or demodulate the uplink reference signal as early as possible. , thereby reducing the processing delay of the uplink transmission. For example, the network device can determine the start time unit of the uplink transmission by detecting the presence of the uplink reference signal.

In addition, in a case where the time unit #α includes a plurality of symbols, the terminal device #A may further determine a symbol for carrying the uplink reference signal in the time unit #α.

As an example and not by way of limitation, in the case where the time unit #T may be the time unit #α, if the time unit #α includes a plurality of symbols, it may occur in the time unit #α to which the terminal device #A competes. The case where the symbol is only a partial symbol in the time unit #α, that is, a case where the terminal device #A cannot compete to one or more symbols located in the front end in the time unit #α (in chronological order) may occur.

In this regard, in the embodiment of the present application, the terminal device #A can use the first symbol of the terminal device #A in the time unit #α to use (or compete for) as a symbol carrying the uplink reference signal.

It should be understood that the method and process for determining the symbol for carrying the uplink reference signal by the terminal device #A enumerated above are merely exemplary, and the present application is not limited thereto, for example, when the terminal device #A competes for the time unit #α In the case of a plurality of symbols, the terminal device #A may use any one or more of the plurality of symbols as a symbol for carrying an uplink reference signal.

As an example and not by way of limitation, in the case where the time unit #T may be the time unit #α, if the time unit #α includes a plurality of symbols, the first symbol in the time unit #α is used to carry the uplink reference signal .

By way of example and not limitation, in the case where the time unit #T may be the time unit #α, if the time unit #α includes a plurality of symbols, the last symbol in the time unit #α is used to carry the uplink reference signal.

As an example and not by way of limitation, in the case where the time unit #T may be the time unit #α, if the time unit #α includes a plurality of symbols, the position of the symbol for carrying the uplink reference signal in the time unit #α is The network device notifies the terminal device #A by signaling, or is a value specified by the communication system or communication protocol.

Situation 2

Specifically, as shown in FIG. 4, in the embodiment of the present application, as the rule for determining the time unit #T, the following rule #2 can be cited.

Rule #2: The time unit #T may be the last time unit (in chronological order) in time unit #1 to time unit #N, that is, time unit #N.

By way of example and not limitation, for example, the rule #2 may be specified by a communication system or a communication protocol, or the rule #2 may be a user input to the terminal device #A, or alternatively, the rule #2 may be a manufacturer or The telecommunications carrier is configured in terminal equipment #A.

For another example, the rule #2 may be determined by the terminal device #A based on the indication information (for example, the third indication information) from the network device.

Specifically, in the embodiment of the present application, the network device may use the indication information of the rule #2 (that is, an example of the third indication information), or is used to indicate that the terminal device #A will time unit #1 to time. Unit #N (in time The last time unit (i.e., time unit #N) in the order is transmitted as the indication information of the time unit #T (i.e., another example of the third indication information) to the terminal device #A.

Therefore, the terminal device #A can determine the use time rule #2 to determine the time unit #T based on the third indication information, that is, the terminal device #A can set the time unit #1 to the time unit #N based on the third indication information. The last time unit (in time sequence) (ie, time unit #N) is taken as time unit #T.

By way of example and not limitation, in the embodiment of the present application, the network device may determine that the terminal device #A can compete for one or more time units located in the front end (in chronological order) in the time unit #1 to the time unit #N ( For example, the probability (eg, probability) of the first time unit in time sequence in time unit #1 to time unit #N, and when the network device determines that the probability (eg, probability) is small, The terminal device #A delivers the third indication information.

Specifically, the network device may determine whether one or more time units of the time unit #1 to the time unit #N do not belong to the MCOT used by the network device, and if the determination result is “Yes”, the network device may determine The terminal device #A can compete in the time unit #1 to the time unit #N (in chronological order) one or more time units located at the front end (for example, in the time sequence from time unit #1 to time unit #N) The possibility of the first time unit is small, so that the network device can deliver the third indication information to the terminal device #A.

That is, if the network device determines that one or more time units of the time unit #1 to the time unit #N do not belong to the MCOT used by the network device, the network device may send the third indication information to the terminal device #A. .

It should be understood that the method and process for determining whether to issue the third indication information by the network device enumerated above are merely exemplary. The application is not limited thereto. For example, the network device may also determine the time unit #1 to the time unit # N is not the number of time units of the MCOT used by the network device is greater than or equal to the preset threshold #2, and if the determination result is YES, the network device can determine that the terminal device #A can compete for the time unit #1 ~ Time unit #N (in chronological order) is more likely to be located in one or more time units of the front end (for example, the first time unit in time sequence in time unit #1 to time unit #N) Therefore, the network device can send the third indication information to the terminal device #A. Further, the threshold #2 may be a value specified by the communication system or the communication protocol, or may be set by the manufacturer or the telecommunication operator in the network device, and the present application is not particularly limited.

For example, the network device may determine whether the time unit #1 to the time unit #N do not belong to the MCOT used by the network device. If the determination result is “Yes”, the network device may determine that the terminal device will use the lower priority. The resource competition mode, so that it can be determined that the terminal device #A can compete for one or more time units located in the front end (in time sequence) in the time unit #1 to the time unit #N (for example, the time unit #1 to the time unit # The possibility of the first time unit in chronological order in N is small, so that the network device can deliver the third indication information to the terminal device #A.

When some or all of the time units of the first time-frequency resource terminal allocated by the network device to the terminal device do not belong to the MCOT used by the network device, the terminal device competes for the possibility of the time unit located at the front end of the first time-frequency resource. If the network device indicates that the network device sends the uplink reference signal on the last time unit of the first time-frequency resource of the terminal device, the uplink reference signal can be reliably ensured, and the reliability and accuracy of the uplink transmission are further improved. .

In addition, in a case where the time unit #N includes a plurality of symbols, the terminal device #A may further determine a symbol for carrying the uplink reference signal in the time unit #N.

As an example and not by way of limitation, in the case where the time unit #T can be the time unit #N, if the time unit #N includes a plurality of symbols, and it may happen that the symbol in the time unit #N to which the terminal device #A competes is only the partial symbol in the time unit #N, that is, the terminal device #A may not compete for the time. The case in cell #N (in chronological order) of one or more symbols at the front end.

In this regard, in the embodiment of the present application, the terminal device #A can use the first symbol of the terminal device #A in the time unit #N to use (or compete) as the symbol carrying the uplink reference signal.

It should be understood that the method and process for determining the symbol for carrying the uplink reference signal by the terminal device #A enumerated above are merely exemplary descriptions, and the present application is not limited thereto, for example, when the terminal device #A competes for the time unit #N In the case of a plurality of symbols, the terminal device #A may use any one or more of the plurality of symbols as a symbol for carrying an uplink reference signal.

As an example and not by way of limitation, in the case where the time unit #T may be the time unit #N, if the time unit #N includes a plurality of symbols, the first symbol in the time unit #N is used to carry the uplink reference signal .

By way of example and not limitation, in the case where the time unit #T may be the time unit #N, if the time unit #N includes a plurality of symbols, the last symbol in the time unit #N is used to carry the uplink reference signal.

As an example and not by way of limitation, in the case where the time unit #T may be the time unit #N, if the time unit #N includes a plurality of symbols, the position of the symbol for carrying the uplink reference signal in the time unit #N is The network device notifies the terminal device #A by signaling, or is a value specified by the communication system or communication protocol.

After determining the time unit #T (specifically, the symbol for carrying the uplink reference signal in the time unit #T) as described above, the terminal device #A may be at the time unit #T (specifically, at S240) It is said that the symbol used to carry the uplink reference signal in the time unit #T transmits an uplink reference signal to the network device.

In addition, in the embodiment of the present application, when the time unit #T is the time unit #N, the terminal device #A can also send the uplink control information to the network device on the time unit #T, thereby enabling the uplink reference signal and the uplink. The control information is carried in the same time unit, and the network device can reliably obtain the uplink reference signal for decoding or demodulating the uplink control information, thereby improving the reliability of the transmission of the uplink control information.

Moreover, in the embodiment of the present application, when the network device and the terminal device #A generate an error based on the uplink transmission of the time unit #α to the time unit #N, a retransmission process, for example, a hybrid automatic repeat request ( Hybrid Automatic Repeat reQuest, HARQ).

When the time unit #T includes the time unit #α, the process of the retransmission process can be similar to the prior art.

When the time unit #T includes only the time unit #N, since the uplink reference signal is carried in the last time unit of the time unit #1 to the time unit #N, the network device cannot determine the terminal device #A based on the uplink reference signal. Whether to compete for all the time units in the time unit #1 to the time unit #N, or the network device cannot determine the first one of the time unit #1 to the time unit #N to which the terminal device #A competes based on the uplink reference signal The time unit, that is, the network device cannot determine the starting position of the time unit used by the terminal device #A for uplink transmission based on the uplink reference signal.

In this case, if an error occurs in the transmission, the RV used for the retransmission of the above uplink data is zero.

That is, when the terminal device sends the uplink reference signal through the last time unit in the first time-frequency resource, the network device cannot determine the starting position of the uplink transmission by using the uplink reference signal, so that when a transmission error occurs, the network device It is impossible to determine whether the transmission error is a transmission error caused by a poor channel condition, or a transmission error caused by the terminal device not competing for a part of the time unit of the first time-frequency resource located at the front end. In this case, by causing the network device to determine The RV used for the retransmission of the uplink data is 0, which can reduce the cause of the inability to determine the retransmission error. The impact of uplink transmission.

Alternatively, if an error occurs in the transmission, the network device may discard the soft bit information of the erroneous uplink data.

That is, when the terminal device sends the uplink reference signal through the last time unit in the first time-frequency resource, the network device cannot determine the starting position of the uplink transmission by using the uplink reference signal, so that when a transmission error occurs, the network device It is unclear whether the transmission error is a transmission error caused by a poor channel condition, or a transmission error caused by the terminal device not competing to a part of the time unit of the first time-frequency resource located at the front end. In this case, by causing the network device to discard occurs. Transmitting the soft bits of the erroneous uplink data can prevent the soft buffer on the network device side from being contaminated, thereby reducing the impact on the uplink transmission due to the inability to determine the retransmission error.

In the downlink data transmission, the network device may configure a Discovery Reference Signal (DRS) for the cell in order to discover the small cell in the switch state and optimize the radio resource management RRM measurement of the terminal device. The DRS is transmitted in the DRS measurement timing configuration (DMTC) window in the period in which the network device is configured. The length of the DMTC window is 6 ms. The DRS is composed of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a Common Reference Signal (CRS). It can also be configured with a channel state information reference signal (Channel State). Information Reference Signal, CSI-RS).

There are two cases in which a DRS subframe is transmitted on the unlicensed spectrum. In one case, the DRS subframe overlaps with the one downlink burst transmission in time. In this case, the DRS subframe can only be subframe 0 or subframe. 5, that is, the DRS can only be transmitted on a subframe with a subframe number of 0 or 5. In addition, since the DRS subframe belongs to one downlink burst transmission, the PDSCH can also be transmitted on the DRS subframe. In another case, the DRS subframe does not overlap with the downlink burst transmission in time. Due to the high importance of the DRS, the network device can use the higher priority resource contention mode to compete for the DRS. The DRS may be advertised in the first subframe of the resource contending in the DMTC window. Accordingly, the transmission time of the DRS is limited, and only 12 consecutive symbols in the DRS subframe can be occupied, and the PDSCH cannot be transmitted in the DRS subframe. . FIG. 5 is a schematic diagram showing transmission of a DRS subframe when a DRS subframe does not overlap with a downlink burst transmission in time. In order to ensure continuity of signal transmission on the unlicensed spectrum to prevent other devices from preempting the channel, the gray portion in Figure 5 represents the reservation signal transmitted by the network device.

In the prior art, when the DRS subframe and the downlink burst transmission do not overlap in time, the DRS and the PDSCH cannot be multiplexed and transmitted on the DRS subframe, and the network device can ensure the DRS by transmitting the reserved signal on the DRS subframe. The continuity of signal transmission on the sub-frame results in lower resource utilization on the unlicensed spectrum.

The following describes the transmission process of the downlink data in the embodiment of the present application in detail with reference to FIG. FIG. 6 is a schematic interaction diagram of an example of a transmission process of downlink data according to an embodiment of the present application.

As shown in FIG. 6, in S310, the network device determines a second time-frequency resource (for example, time-frequency resource #B), where the second time-frequency resource is a resource on a DRS subframe of a discovery reference signal, and the DRS subframe There is no overlap in time with the first downlink burst transmission.

It should be understood that the second time-frequency resource may be a resource on the unlicensed band in the frequency domain.

By way of example and not limitation, the DRS subframe is not subframe 0 or subframe 5. That is, in the embodiment of the present application, multiplexing transmission of DRS and downlink data is allowed on a subframe in which the DRS subframe number is not 0 or 5.

At S320, the network device sends a physical downlink shared channel PDSCH for the terminal device #B (ie, an example of the terminal device) on the second time-frequency resource.

It should be understood that, in the prior art, when the DRS subframe does not overlap with the first downlink burst transmission in time, the maximum duration of the signal transmission available on the DRS subframe is 12 symbols, that is, the symbol 0 to the symbol. 11, as shown in Figure 5. By way of example and not limitation, in the embodiment of the present application, the length of the second time-frequency resource in the time domain is less than or equal to 7 symbols. That is, the DRS subframe may be divided into multiple sTTIs according to the TTI length, and the network device performs PDSCH scheduling according to the divided sTTI structure.

By way of example and not limitation, when the TTI length corresponding to the second time-frequency resource is 7 symbols, the DRS subframe may include 2 sTTIs, and the corresponding lengths are 7 symbols and 5 symbols, respectively. Correspondingly, the network device can schedule the time-frequency resource #B1 (ie, an example of the second time-frequency resource) for the PDSCH transmission on the symbols 0 to 6, and schedule the time-frequency resource #B2 on the symbols 7 to 11. Another example of a second time-frequency resource is used for PDSCH transmission.

By way of example and not limitation, when the TTI length corresponding to the second time-frequency resource is 2 symbols, the DRS subframe may include 5 sTTIs, and the corresponding lengths are 3 symbols, 2 symbols, 2 symbols, 2 The symbols and the three symbols, or the corresponding lengths are 2 symbols, 3 symbols, 2 symbols, 2 symbols, and 3 symbols, respectively. Correspondingly, the network device can schedule PDSCH transmission according to the foregoing sTTI structure, and details are not described herein again.

By way of example and not limitation, the second time-frequency resource does not include symbols in the DRS subframe for transmitting synchronization signals in the time domain. For example, when the network device performs downlink data scheduling, the PDSCH is not transmitted on the

symbols

5 and 6 in the DRS subframe.

It should be understood that, in the prior art, when the DRS is transmitted on any one of subframe 0 to subframe 4, the subframe number (or slot number) used for the generation of the DRS sequence is subframe 0. (or, the first time slot of subframe 0, that is, time slot 0); the subframe number used for the generation of the DRS sequence when the DRS is transmitted on any of subframes 5 to 9 (or, slot number) is subframe 5 (or, the first slot of subframe 5, ie, slot 10). By way of example and not limitation, in the embodiment of the present application, a subframe number (or a slot number) generated by a scrambling code sequence for the PDSCH scrambling and a subframe number (or, a time frame for the generation of the DRS sequence) The slot number is the same. For example, when the PDSCH is transmitted on any one of subframe 0 to subframe 4, the subframe number (or slot number) generated by the scrambling code sequence for the PDSCH scrambling is subframe 0 ( Or, the first time slot of subframe 0, that is, time slot 0); the scrambling code sequence used for the PDSCH scrambling when the PDSCH is transmitted in any of subframes 5 to 9 The generated subframe number (or slot number) is subframe 5 (or the first slot of subframe 5, that is, slot 10).

At S330, the terminal device #B receives the PDSCH on the second time-frequency resource.

By way of example and not limitation, in the embodiment of the present application, the terminal device #B detects a control channel on the DRS subframe, and receives the PDSCH on the second time-frequency resource according to the indication of the control channel.

When the DRS subframe does not overlap with the first downlink burst transmission in time, the resource utilization on the unlicensed spectrum can be improved by causing the network device to allocate resources on the DRS subframe to the terminal device for downlink data transmission. rate.

FIG. 7 is a schematic block diagram of an apparatus 400 for receiving an uplink reference signal according to an embodiment of the present application. The apparatus 400 of the wireless communication may correspond to (for example, may be configured or itself) a network device described in the foregoing method 200, In addition, each module or unit in the wireless communication device 400 is used to perform each action or process performed by the network device in the above method 200. Here, in order to avoid redundancy, detailed description thereof will be omitted.

In the embodiment of the present application, the apparatus 400 may include a processor and a transceiver, and the processor and the transceiver are connected. Optionally, the device further includes a memory, and the memory is communicatively coupled to the processor. Therein, there may be a communication connection between the processor, the memory and the transceiver, the memory being operative to store instructions for executing the instructions stored by the memory to control the transceiver to transmit information or signals.

Wherein, the processing unit in the device 400 shown in FIG. 7 can correspond to the processor, and the communication unit in the device 400 shown in FIG. 7 can correspond to the transceiver.

FIG. 8 is a schematic block diagram of an apparatus 500 for transmitting an uplink reference signal according to an embodiment of the present application. The apparatus 500 of the wireless communication may correspond to (eg, may be configured or itself) the terminal device described in the foregoing method 200 ( For example, the terminal device #A), and each module or unit in the device 500 for transmitting the uplink reference signal is used to perform each action or process performed by the terminal device (for example, the terminal device #A) in the above method 200, Here, in order to avoid redundancy, a detailed description thereof will be omitted.

In the embodiment of the present application, the apparatus 500 may include a processor and a transceiver, and the processor and the transceiver are connected. Optionally, the device further includes a memory, and the memory is communicatively coupled to the processor. Therein, there may be a communication connection between the processor, the memory and the transceiver, the memory being operative to store instructions for executing the instructions stored by the memory to control the transceiver to transmit information or signals.

Wherein, the determining unit in the apparatus 500 shown in FIG. 8 can correspond to the processor, and the communication unit in the apparatus 500 shown in FIG. 8 can correspond to the transceiver.

FIG. 9 is a schematic block diagram of an apparatus 600 for transmitting downlink data according to an embodiment of the present application, where the apparatus 600 of the wireless communication may correspond to (eg, may be configured or itself) the network device described in the foregoing method 300, and Each module or unit in the apparatus 600 for wireless communication is used to perform each action or process performed by the network device in the above method 300. Here, in order to avoid redundancy, detailed description thereof will be omitted.

In the embodiment of the present application, the apparatus 600 may include: a processor and a transceiver, the processor and the transceiver being connected. Optionally, the device further includes a memory, and the memory and the processor may have a communication connection. Therein, there may be a communication connection between the processor, the memory and the transceiver, the memory being operative to store instructions for executing the instructions stored by the memory to control the transceiver to transmit information or signals.

Wherein, the determining unit in the device 600 shown in FIG. 9 can correspond to the processor, and the communication unit in the device 600 shown in FIG. 9 can correspond to the transceiver.

FIG. 10 is a schematic block diagram of an apparatus 700 for receiving downlink data according to an embodiment of the present application. The apparatus 700 for wireless communication may correspond to (eg, may be configured or itself) a terminal device described in the foregoing method 300 (for example, The terminal device #B), and each module or unit in the device 700 for receiving downlink data is used to perform each action or process performed by the terminal device (for example, the terminal device #B) in the method 300, where In order to avoid redundancy, a detailed description thereof will be omitted.

In the embodiment of the present application, the apparatus 700 may include a processor and a transceiver, and the processor and the transceiver are connected. Optionally, the device further includes a memory, and the memory and the processor may have a communication connection. Therein, there may be a communication connection between the processor, the memory and the transceiver, the memory being operative to store instructions for executing the instructions stored by the memory to control the transceiver to transmit information or signals.

Wherein, the processing unit in the apparatus 700 shown in FIG. 10 can correspond to the processor, and the communication unit in the apparatus 700 shown in FIG. 10 can correspond to the transceiver.

It should be noted that the foregoing method embodiments of the present application may be applied to a processor or implemented by a processor. At The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programming logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.

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

It should be understood that the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

It should be understood that, in various embodiments of the embodiments of the present application, the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the execution order of each process should be determined by its function and internal logic, and should not be applied to this application. The implementation of the embodiments constitutes any limitation.

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

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

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

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

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

The foregoing is only a specific embodiment of the embodiments of the present application, but the scope of protection of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily adopt the technical scope disclosed in the embodiments of the present application. All changes or substitutions are contemplated to be within the scope of the embodiments of the present application. Therefore, the scope of protection of the embodiments of the present application is subject to the scope of protection of the claims.

Claims

A method for receiving an uplink reference signal, the method comprising:

The network device allocates, for the terminal device, a first time-frequency resource for uplink transmission, where the first time-frequency resource includes at least two time units in the time domain, and the first time-frequency resource is that the terminal device adopts a competition mode. Time-frequency resources used;

Receiving, by the network device, an uplink reference signal sent by the terminal device, where the uplink reference signal is carried in a first time unit, where the first time unit includes a last one of the at least two time units, Or the first time unit includes a first time unit that is usable by the terminal device in the at least two time units.
The method according to claim 1, wherein the first time-frequency resource belongs to an unlicensed frequency band in a frequency domain.
The method according to claim 1 or 2, wherein the uplink reference signal is used when the first time unit includes a first time unit that the terminal device can use in the at least two time units And carrying a first symbol that is usable by the terminal device in the first time unit.
The method according to any one of claims 1 to 3, wherein when the first time unit includes a first time unit in which the terminal device is usable in the at least two time units, Before the network device receives the uplink reference signal sent by the terminal device, the method includes:

The network device sends first indication information to the terminal device, where the first indication information is used to indicate that the terminal device uses, as the first time unit, the terminal device in the at least two time units The first time unit; or

The network device sends the second indication information to the terminal device, where the second indication information is used to indicate that the terminal device uses the first time unit of the at least two time units as the first time unit.
The method according to claim 4, wherein before the sending, by the network device, the first indication information or the second indication information to the terminal device, the method includes:

The network device determines that at least one of the at least two time units belongs to a maximum channel occupancy time MCOT that the network device is capable of using.
The method according to any one of claims 1 to 5, wherein when the first time unit includes a last one of the at least two time units, the network device receives the Before the uplink reference signal sent by the terminal device, the method includes:

The network device sends third indication information to the terminal device, where the third indication information is used to indicate that the terminal device uses the last one of the at least two time units as the first time unit.
The method according to claim 6, wherein before the sending, by the network device, the third indication information to the terminal device, the method includes:

The network device determines that at least one of the at least two time units does not belong to an MCOT that the network device is capable of using.
The method according to any one of claims 1 to 7, wherein when the first time unit comprises the last one of the at least two time units, the method further comprises:

If an error occurs in the reception of the uplink data carried on the second time unit, the network device determines that the redundancy version RV used for the retransmission of the uplink data is 0, wherein the second time unit includes A time unit other than the first time unit of the at least two time units.
The method according to any one of claims 1 to 8, wherein when the first time unit comprises the last one of the at least two time units, the method further comprises:

If the receiving of the uplink data carried on the second time unit is incorrect, the network device discards the uplink data, wherein the second time unit includes the first time in the at least two time units The time unit outside the unit.
The method according to any one of claims 1 to 9, wherein when the first time unit comprises the last one of the at least two time units, the method further comprises:

The network device receives uplink control information sent by the terminal device, where the uplink control information is carried in a last one of the at least two time units.
A method for transmitting an uplink reference signal, the method comprising:

The terminal device determines a first time-frequency resource allocated by the network device for uplink transmission, where the first time-frequency resource includes at least two time units in a time domain, where the first time-frequency resource is that the terminal device adopts a competition. Time-frequency resources used by the method;

Determining, by the terminal device, a first time unit from the at least two time units, wherein the first time unit includes a last one of the at least two time units, or the first time unit And including a first time unit that is available to the terminal device in the at least two time units;

The terminal device sends an uplink reference signal on the first time unit.
The method according to claim 11, wherein the first time-frequency resource belongs to an unlicensed band in the frequency domain.
The method according to claim 11 or 12, wherein the uplink reference signal is used when the first time unit includes a first time unit that can be used by the terminal device in the at least two time units And carrying a first symbol that is usable by the terminal device in the first time unit.
The method according to any one of claims 11 to 13, wherein the determining, by the terminal device, the first time unit from the at least two time units comprises:

The terminal device receives the first indication information that is sent by the network device, where the first indication information is used to indicate that the terminal device uses the first time unit that is available to the terminal device in the at least two time units. As the first time unit, the terminal device uses, as the first time unit, a first time unit that can be used by the terminal device in the at least two time units according to the first indication information; or

The terminal device receives the second indication information that is sent by the network device, where the second indication information is used to indicate that the terminal device uses the first time unit of the at least two time units as the first time unit. And the terminal device uses, as the first time unit, a first time unit that is available to the terminal device in the at least two time units according to the second indication information.
The method according to claim 14, wherein the first indication information or the second indication information is that the network device determines that at least one time unit of the at least two time units belongs to the network The maximum channel occupancy time that the device can use is sent after MCOT.
The method according to any one of claims 11 to 15, wherein the terminal device is from the Determining the first time unit in at least two time units, including:

The terminal device receives the third indication information that is sent by the network device, where the third indication information is used to indicate that the terminal device uses the last one of the at least two time units as the first time unit. ;

The terminal device uses, as the first time unit, the last one of the at least two time units according to the third indication information.
The method according to claim 16, wherein the third indication information is that the network device determines that at least one of the at least two time units does not belong to an MCOT that can be used by the network device Sent.
The method according to any one of claims 11 to 17, wherein when the first time unit includes the last one of the at least two time units, the method further comprises:

The terminal device sends uplink control information to the network device on a last one of the at least two time units.
An apparatus for receiving an uplink reference signal, the apparatus comprising:

a processing unit, configured to allocate, to the terminal device, a first time-frequency resource for uplink transmission, where the first time-frequency resource includes at least two time units in a time domain, where the first time-frequency resource is the terminal device Time-frequency resources used in a competitive manner;

a communication unit, configured to receive an uplink reference signal sent by the terminal device, where the uplink reference signal is carried in a first time unit, where the first time unit includes a last one of the at least two time units Or, the first time unit includes a first time unit that the terminal device can use in the at least two time units.
The apparatus according to claim 19, wherein said first time-frequency resource belongs to an unlicensed frequency band in a frequency domain.
The apparatus according to claim 19 or 20, wherein the uplink reference signal is used when the first time unit includes a first time unit that the terminal device can use in the at least two time units And carrying a first symbol that is usable by the terminal device in the first time unit.
The apparatus according to any one of claims 19 to 21, wherein when the first time unit includes a first time unit in which the terminal device is usable in the at least two time units, The communication unit is further configured to send the first indication information to the terminal device, where the first indication information is used to indicate that the terminal device uses the first time in the at least two time units to be used by the terminal device. a unit as the first time unit; or

And the second indication information is used to indicate that the terminal device uses the first time unit of the at least two time units as the first time unit.
The apparatus according to claim 22, wherein the processing unit is further configured to determine that at least one of the at least two time units belongs to a maximum channel occupation time MCOT that the device can use.
The apparatus according to any one of claims 19 to 23, wherein when the first time unit includes the last one of the at least two time units, the communication unit is further configured to The terminal device sends the third indication information, where the third indication information is used to indicate that the terminal device uses the last one of the at least two time units as the first time unit.
The apparatus according to claim 24, wherein said processing unit is further configured to determine said at least At least one of the two time units does not belong to the MCOT that the device can use.
Apparatus according to any one of claims 19 to 25, wherein when said first time unit comprises the last one of said at least two time units, said processing unit is further Receiving an error of the uplink data carried on the second time unit, determining that the redundancy version RV used for the retransmission of the uplink data is 0, wherein the second time unit includes the at least two time units a time unit other than the first time unit.
Apparatus according to any one of claims 19 to 26, wherein when said first time unit comprises the last one of said at least two time units, said processing unit is further And transmitting, by the second time unit, a time unit other than the first time unit .
Apparatus according to any one of claims 19 to 27, wherein said communication unit is further adapted to receive when said first time unit comprises a last one of said at least two time units The uplink control information sent by the terminal device, where the uplink control information is carried in a last one of the at least two time units.
An apparatus for transmitting an uplink reference signal, the apparatus comprising:

a determining unit, configured to determine a first time-frequency resource allocated by the network device for uplink transmission, where the first time-frequency resource includes at least two time units in a time domain, where the first time-frequency resource is the device a time-frequency resource used in a contentive manner; for determining a first time unit from the at least two time units, wherein the first time unit comprises a last one of the at least two time units, or The first time unit includes a first time unit that is usable by the device in the at least two time units;

And a communication unit, configured to send an uplink reference signal on the first time unit.
The apparatus according to claim 29, wherein said first time-frequency resource belongs to an unlicensed band in the frequency domain.
The apparatus according to claim 29 or 30, wherein said uplink reference signal bearer is provided when said first time unit comprises a first time unit usable by said device in said at least two time units The first symbol that the device is capable of using in the first time unit.
The device according to any one of claims 29 to 31, wherein the communication unit is further configured to receive first indication information sent by the network device, where the first indication information is used to indicate the device The first time unit that can be used by the device in the at least two time units is used as the first time unit, and the determining unit is specifically configured to: according to the first indication information, the at least two times a first time unit that can be used by the device in the unit as the first time unit; or

The communication unit is further configured to receive second indication information that is sent by the network device, where the second indication information is used to instruct the device to use a first time unit of the at least two time units as the first a time unit, the determining unit is configured to use, as the first time unit, a first time unit that is usable by the device in the at least two time units according to the second indication information.
The apparatus according to claim 32, wherein the first indication information or the second indication information is that the network device determines that at least one time unit of the at least two time units belongs to the network The maximum channel occupancy time that the device can use is sent after MCOT.
Apparatus according to any one of claims 29 to 33, wherein said communication unit is further Receiving, by the network device, third indication information, where the third indication information is used to indicate that the device uses the last one of the at least two time units as the first time unit;

The determining unit is specifically configured to use, as the first time unit, a last one of the at least two time units according to the third indication information.
The apparatus according to claim 34, wherein said third indication information is that said network device determines that at least one of said at least two time units does not belong to an MCOT usable by said network device Sent.
The apparatus according to any one of claims 29 to 35, wherein when the first time unit includes the last one of the at least two time units, the communication unit is further configured to Uplink control information is sent to the network device on a last one of the at least two time units.