CN110267226B - Information sending method and device - Google Patents

Information sending method and device Download PDF

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Publication number
CN110267226B
CN110267226B CN201810200200.XA CN201810200200A CN110267226B CN 110267226 B CN110267226 B CN 110267226B CN 201810200200 A CN201810200200 A CN 201810200200A CN 110267226 B CN110267226 B CN 110267226B
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time period
frequency domain
domain resource
sub
target
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CN110267226A (en
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苏宏家
向铮铮
张锦芳
罗俊
卢磊
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201810200200.XA priority Critical patent/CN110267226B/en
Priority to PCT/CN2019/076014 priority patent/WO2019174453A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Abstract

The embodiment of the invention provides an information sending method and device, which are used for reducing the collision probability when a plurality of terminal devices compete for the same frequency domain resource and reducing the data transmission delay. In the method and apparatus, the transmission time period comprises at least one available frequency domain resource, and the first time period comprises a first time period, wherein the first time period is subdivided into a plurality of sub-time periods. The first terminal device determines a target sub-time period within the first time period and listens for information indicating that one or more frequency domain resources are occupied on one or more sub-time periods preceding the target sub-time period. If at least one frequency domain resource is available in the target sub-time period, namely the terminal equipment does not monitor the indication information that the frequency domain resource is occupied, the first terminal equipment sends the indication information that the frequency domain resource is occupied on one of the at least one available frequency domain resource. The method can be applied to the car networking (comprising V2V, V2I and V2P), intelligent automobiles, automatic driving and intelligent transportation systems.

Description

Information sending method and device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for sending information.
Background
The Vehicle networking (Vehicle-To-evolution) refers To information interaction between vehicles and the outside, and comprises Vehicle-To-Vehicle (V2V), Vehicle-To-Infrastructure (V2I), Vehicle-To-pedestrian (V2P) and other modes, which are the basis and key technologies of future intelligent automobiles, automatic driving and intelligent transportation systems.
Different from the traditional cellular network communication mode, the terminal devices in the car networking can communicate with each other by means of the base station and can also directly communicate through a Side Link (SL), that is, data of both communication parties do not need to be forwarded through the base station.
Edge link communication includes two modes of communication: the first communication mode is side link communication based on base station scheduling, and the terminal equipment transmits control information and data of the side link communication on scheduled wireless resources according to scheduling information of the base station, which is called a mode three (mode3) working mode; the second communication mode is that the terminal equipment monitors the side link communication resource pool, then self-selects the wireless resource used by the side link communication from the monitored available wireless resources, and transmits the control information and data on the selected wireless resource, which is called mode four (mode4) working mode. The side link communication resource pool comprises a plurality of wireless resources, and the terminal equipment occupies one or more continuous wireless resources in the frequency domain at each time for sending the control information and the data through the side link.
The terminal device operating in the Mode4 selects a sending time period window with a certain size to be sent based on historical listening (or Sensing) information, and selects a time period to send information (such as control information and/or data) in the sending time period window. Two or more terminal devices may select the same frequency domain resource over the same time period. At this time, the information may fail to be transmitted because of the collision. For the service with urgent delay requirement, the sending time period window is smaller, and the collision probability is larger.
Disclosure of Invention
The embodiment of the invention describes an information sending method and device, which are used for solving the problems of high collision probability and large time delay when information is sent by directly using frequency domain resources.
In a first aspect, an embodiment of the present invention provides a method for sending information, where the method includes a first terminal device determining a sending time period, where the sending time period includes a first time period, a length of the first time period is less than a length of the sending time period, the first time period includes N sub-time periods, N is a positive integer, and N > 1; the method comprises the steps that a first terminal device selects a target sub-time period, wherein the target sub-time period is one of N sub-time periods; and the first terminal equipment sends indication information in the target sub-time period, wherein the indication information is used for indicating that target frequency domain resources are occupied, and the target frequency domain resources are positioned in the sending time period. Through the scheme provided by the embodiment, the first terminal device can send the indication information that the target frequency domain resource is occupied in the first time period, so that the probability of collision with other terminal devices on the same frequency domain resource is reduced, and the time delay caused by the collision is reduced.
In one possible design, the first time period includes a first portion and a second portion; the first part comprises N1 sub-time periods for monitoring and/or sending indication information that frequency domain resources are occupied, wherein N1 is a positive integer, N1 is smaller than N, and the target sub-time period is located in the first part; the second portion includes N2 sub-periods for Automatic Gain Control (AGC), N1+ N2 ≦ N. The first time period is used for AGC and sending the indication information, thereby ensuring that the resources are fully utilized and ensuring that more resources are used for information sending in the second time period.
In one possible design, the transmitting, by the first terminal device, the indication information in the target sub-period includes: and the first terminal equipment sends the indication information on the frequency domain resource corresponding to the target frequency domain resource in the target sub-time period. That is to say, the terminal device sends the indication message on the first frequency domain resource of the target sub-period, which means that the second frequency domain resource of the corresponding second period is occupied, the sending and receiving modes of the indication message are very simple, and after other terminal devices monitor the indication message, the second frequency domain resource is not used in the current period, so that the collision probability is reduced.
In one possible design, the time period further includes: a second time period, the second time period being after the first time period; after the first terminal device sends the indication information in the target sub-period, the method further includes: and the first terminal equipment transmits information on the target frequency domain resource of the second time period.
In one possible design, before the first terminal device sends the information indicating that the target frequency domain resource is occupied, the method further includes: the method comprises the steps that a first terminal device selects one frequency domain resource from an available frequency domain resource set in a sending time period as a target frequency domain resource; and the first terminal equipment monitors the indication information sent by other terminal equipment on the first frequency domain resource corresponding to the target frequency domain resource in at least one sub-time period before the target sub-time period. Firstly, a target frequency domain resource is selected, and then whether the target frequency domain resource is occupied by other terminal equipment is monitored, so that the monitoring complexity of the first terminal equipment is further simplified, namely, only one frequency domain resource needs to be monitored.
In one possible design, if the first terminal device monitors the occupied indication information of the target frequency domain resource sent by other terminal devices on the first frequency domain resource corresponding to the target frequency domain resource, the first terminal device does not send information on the target frequency domain resource in the second time period; and/or if the first terminal equipment does not monitor the indication information that the target frequency domain resources sent by other terminal equipment are occupied on the first frequency domain resources corresponding to the target frequency domain resources, the first terminal equipment sends information on the target frequency domain resources in the second time period. The method of monitoring the indication information first and then determining whether to send the indication information according to whether the indication information is monitored can effectively reduce the collision probability among different terminal devices.
In one possible design, the first terminal device starts a counter, an initial value C of the counter is randomly selected or preconfigured by the first terminal device, C is a natural number and 0 ≦ C ≦ N1; every time a sub-time period passes, and in the sub-time period, the first terminal device does not monitor indication information that target frequency domain resources sent by other terminal devices are occupied on the first frequency domain resources corresponding to the target frequency domain resources, and the counter is decremented by 1; and the first terminal equipment determines the corresponding sub-time period when the counter is reduced to 0 as the target sub-time period.
In one possible design, the first terminal device starts a counter, and the initial value of the counter is 0; every time a sub-time period passes, and in the sub-time period, the first terminal equipment does not monitor indication information sent by other terminal equipment on the first frequency domain resource corresponding to the target frequency domain resource, and the counter is increased by 1; and the first terminal equipment determines a corresponding sub-time period when the counter is added to C as the target sub-time period, wherein C is randomly selected or preconfigured by the first terminal equipment, C is a natural number, and C is more than or equal to 0 and less than or equal to N1.
In one possible design, before the first terminal device sends the information indicating that the target frequency domain resource is occupied, the method further includes: and the first terminal equipment monitors the indication information sent by other terminal equipment in the available frequency domain resource set in the sending time period on at least one sub-time period before the target sub-time period. By monitoring more frequency domain resources, the frequency domain resources which are not occupied by other terminal equipment can be obtained more generally, and the information sending time delay is reduced.
In one possible design, the first terminal device selects one frequency domain resource from a candidate frequency domain resource set as a target frequency domain resource, where the candidate frequency domain resource set is a subset of available frequency domain resources and does not include frequency domain resources indicated by indication information sent by other terminal devices monitored by the first terminal device.
In one possible design, the first terminal device further includes, before the transmission time period: the method comprises the steps that a first terminal device determines a sending time period window, wherein the sending time period window comprises at least one time period, and the sending time period belongs to one time period in the sending time period window; the first terminal device selects a time period from the time period window as the transmission time period. By determining the time period, the time delay of the information can be ensured to meet the service quality requirement of the service.
In one possible design, the first terminal device determines the time period window according to a quality of service requirement of the information to be transmitted, where the quality of service requirement includes a delay requirement. And selecting a proper time window by combining with the service quality requirement so as to ensure the time delay of the information.
In one possible design, before the first terminal device determines the target sub-period, the method further includes: the first terminal device monitors at least one frequency domain resource in M time periods before a time period window, and determines an available frequency domain resource set in the time period, wherein M is a positive integer.
In one possible design, the time period is any one of: slots, mini-slots, subframes, and Transmission Time Intervals (TTIs).
In one possible design, the first time period includes X first OFDM symbols, where X is a positive integer; the second time period includes Y second OFDM symbols, where Y is a positive integer.
In one possible design, the first OFDM symbol and the second OFDM symbol have the same subcarrier spacing; alternatively, the first OFDM symbol and the second OFDM symbol may have different subcarrier spacings.
In a second aspect, an embodiment of the present invention provides an apparatus for information transmission, including a processor and a transceiver coupled to the processor. The transceiver is used for transmitting or receiving signals; the processor is configured to determine a transmission time period, where the transmission time period includes a first time period, and a length of the first time period is smaller than a length of the transmission time period, the first time period includes N sub-time periods, N is a positive integer, and N > 1; the processor is further configured to select a target sub-period, wherein the target sub-period is one of N sub-periods; the processor is further configured to send, by the transceiver, indication information in the target sub-period, where the indication information is used to indicate that a target frequency domain resource is occupied, and the target frequency domain resource is located in the sending period.
In one possible design, the first time period includes a first portion and a second portion; the first part comprises N1 sub-time periods for monitoring and/or sending indication information that frequency domain resources are occupied, wherein N1 is a positive integer, N1 is smaller than N, and the target sub-time period is located in the first part; the second portion includes N2 sub-periods for automatic gain control, N1+ N2 ≦ N.
In one possible design, the sending the indication information in the target sub-period includes: the processor is configured to send, by the transceiver, the indication information on a frequency domain resource corresponding to the target frequency domain resource in the target sub-period.
In one possible design, the time period further includes: a second time period, the second time period being after the first time period; the processor, after sending the indication information in the target sub-period, is further configured to send information on the target frequency domain resource in the second period.
In one possible design, before the sending the information indicating that the target frequency domain resource is occupied, the method further includes: the processor is configured to select one frequency domain resource from the set of available frequency domain resources in the sending time period as a target frequency domain resource; the processor is further configured to monitor, by the transceiver, indication information sent by another terminal device on a frequency domain resource corresponding to the target frequency domain resource in at least one sub-time period before the target sub-time period.
In one possible design, the processor is configured to determine not to send information on the target frequency domain resource of the second time period if indication information sent by another terminal device is monitored on a frequency domain resource corresponding to the target frequency domain resource; and/or the processor is configured to determine to send information on the target frequency domain resource of the second time period if indication information sent by other terminal devices is not monitored on the frequency domain resource corresponding to the target frequency domain resource.
In one possible design, the processor is configured to start a counter, where an initial value C of the counter is randomly selected or preconfigured by the first terminal device, C is a natural number, and 0 ≦ C ≦ N1; the processor is further configured to decrease the counter by 1 every time a sub-time period elapses, and in the sub-time period, if the first terminal device does not monitor the indication information sent by the other terminal device on the frequency domain resource corresponding to the target frequency domain resource; the processor is further configured to determine a sub-period corresponding to when the counter is decreased to 0 as the target sub-period.
In one possible design, the processor is configured to start a counter, where the initial value of the counter is 0; every time a sub-time period passes, and in the sub-time period, the first terminal equipment does not monitor the indication information sent by other terminal equipment on the frequency domain resource corresponding to the target frequency domain resource, and the counter is increased by 1; the processor is further configured to determine a sub-time period corresponding to when the counter is added to C as the target sub-time period, where C is randomly selected or preconfigured by the first terminal device, C is a natural number, and 0 ≦ C ≦ N1.
In one possible design, before sending the information indicating that the target frequency domain resource is occupied, the method further includes: and the processor is configured to monitor, by the transceiver, indication information sent by other terminal devices in the set of available frequency domain resources in the sending time period in at least one sub-time period before the target sub-time period.
In a possible design, the processor is configured to select a frequency domain resource from the candidate frequency domain resource set as a target frequency domain resource, where the candidate frequency domain resource set is a subset of the available frequency domain resources and does not include a frequency domain resource occupied by indication information sent by another terminal device monitored by the first terminal device.
In one possible design, before the sending time period, the method further includes: the processor is configured to determine a transmission time period window, where the transmission time period window includes at least one time period, and the transmission time period belongs to one time period in the transmission time period window; the processor is further configured to select a time period from the time period window as the transmission time period.
In one possible design, the processor is configured to determine the time period window according to a quality of service requirement of information to be sent, where the quality of service requirement includes a delay requirement.
In one possible design, before determining the target sub-period, the method further includes: the processor is configured to monitor, by the transceiver, at least one frequency domain resource in M time periods before the time period window, and determine the available frequency domain resource set in the time period, where M is a positive integer.
In one possible design, the time period is any one of: slots, mini-slots, subframes, and Transmission Time Intervals (TTIs).
In one possible design, the first time period includes X first OFDM symbols, where X is a positive integer; the second time period includes Y second OFDM symbols, where Y is a positive integer.
In one possible design, the first OFDM symbol and the second OFDM symbol are equally spaced apart by subcarriers; or the subcarrier spacing of the first OFDM symbol and the second OFDM symbol is different.
In a third aspect, embodiments of the present invention provide a processor-readable storage medium, including instructions that, when executed on a processor, cause the processor to perform a method in embodiments of the present invention.
In a fourth aspect, an embodiment of the present invention provides a communication apparatus, including a processor and a memory coupled to the processor, where the processor includes an input/output interface, the input/output interface is configured to transmit and receive signals, the memory is configured to store instructions, and the processor is configured to read and execute the instructions in the memory to control the communication apparatus to perform a method in each embodiment of the present invention.
Drawings
Fig. 1 is a diagram of a wireless communication system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a possible structure of a terminal device in the wireless communication system.
Fig. 3 is a schematic diagram illustrating a timing relationship of information transmission.
Fig. 4 is a schematic diagram illustrating time slot structure division according to an embodiment of the present invention.
Fig. 5 is a flowchart illustrating a method for sending information according to an embodiment of the present invention.
Fig. 6 is a flowchart illustrating another information sending method according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that, in the case of no conflict, the technical solutions or features in the embodiments of the present invention may be combined with each other.
It should be understood that the present invention is applicable to wireless communication systems. For example, Long Term Evolution (LTE) Device-to-Device (D2D) communication, enhanced D2D communication, Vehicle-to-internet (Vehicle-to-Evolution) communication, including Vehicle-to-Vehicle (V2V), Vehicle-to-person (V2P), Vehicle-to-Infrastructure (V2I) and the like communication, a side link communication-based communication system in a 5G communication system, and the like. The embodiment of the present invention takes V2V communication in a 5G communication system as an example, and does not limit the technical solution provided by the embodiment of the present invention, and as a person of ordinary skill in the art knows that, with the appearance of a new service scenario and the evolution of a network architecture, the technical solution provided by the embodiment of the present invention is also applicable to similar technical problems.
It should be understood that the edge link communication technology is an end-to-end direct communication technology, and the biggest difference from the traditional cellular communication technology is that the terminal device and the terminal device can communicate through the edge link communication without needing the relay of the base station, and the base station can perform resource configuration, scheduling, coordination and the like to assist the terminal device to communicate through the edge link.
Fig. 1 shows an application scenario of the embodiment of the present invention, where the scenario includes a network device 101 and terminal devices 111 to 114 (for simplicity, only 4 terminal devices are shown in the drawing, but it does not mean that only 4 terminal devices are shown, and in fact, there may be any number of terminal devices). Part or all of the terminal devices 111 to 114 may be located within the coverage of the network device 101, or may be located outside the coverage of the network device 101. Network device 101 communicates with one or more of terminal devices 111-114 over an air interface (which is a Uu interface as in LTE and 5G systems). For example, in fig. 1, terminal device 112 communicates with network device 101 over air interface 131. The terminal devices 111-114 may also communicate via side links (e.g., in LTE, the side link interface is a PC5 interface). As shown in fig. 1, terminal device 111 communicates with terminal device 112 via edge link 121, and terminal device 113 communicates with terminal device 114 via edge link 122. In another application scenario of the embodiment of the present invention, only the terminal devices 111 to 114 may exist. At this time, the terminal devices 111-114 can communicate with each other through a side link (as in LTE, the side link interface is a PC5 interface).
When the terminal devices communicate through the side link, two operation modes are included, one is a Mode3 operation Mode, and the other is a Mode4 operation Mode.
In the Mode3 operation Mode, a terminal device requests a network device to allocate a radio resource for side link communication, and sends control information and data of side link communication on the allocated radio resource according to scheduling information of the network device, when terminal devices 111 and 112 shown in fig. 1 perform side link communication, terminal device 111 sends a scheduling request to the network device to request network device 101 to allocate a side link communication resource for terminal device 111, and accordingly, network device 101 allocates a resource for terminal device 111, and notifies terminal device 111 of the resource allocated for terminal device 111 through the scheduling information, and terminal device 111 uses the resource to send control information and/or data to other terminal devices.
In the Mode4 operation Mode, the terminal device monitors the side link communication resource pool, then self-selects one or more wireless resources used by side link communication from at least one monitored available wireless resource, and transmits control information and data on the selected resources. The side link communication resource pool comprises a plurality of wireless resources, the terminal equipment sends control information and data through the side link each time to occupy one or more wireless resources, and the one or more wireless resources are continuous on a frequency domain. When the terminal devices 113 and 114 shown in fig. 1 perform side link communication, the Mode4 operation Mode is adopted. The side link communication resource pool comprises a plurality of wireless resources, and the terminal equipment uses one or more continuous wireless resources in frequency domain to transmit control information and data.
It should be understood that, in the embodiment of the present invention, a Network device (for example, the Network device 101) is an apparatus deployed in a Radio Access Network (RAN) to provide a wireless communication function for a terminal device. The network devices may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like. The network device may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB, NB) in WCDMA, an evolved Node B (eNB or e-NodeB) in LTE or ehte, or a next generation mobile network, such as a Base Station gNB (next) generation NodeB in 5g (fine generation), or a roadside Unit (RSU) in V2X communication, or a Chip or System On Chip (SOC) inside the network device or the Base Station. For convenience of description, in this application, it is sometimes referred to as a base station, simply referred to as a network device or an access network device.
In the embodiment of the present invention, a Terminal device may also be referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), and the like, and the Terminal device may communicate with one or more core network devices through a radio access network device, for example, the Terminal device is a device having a radio transceiving function, and may be deployed on a land, including indoors or outdoors, handheld, or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a mobile phone (mobile phone), a Tablet computer (Tablet), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in home (smart home), and the like. For convenience of description, in this application, it is simply referred to as terminal equipment or UE.
FIG. 2 shows a wireless communication device provided in an embodiment of the present invention, which can be used as the terminal devices 111 to 114 or as an apparatus applied in the terminal devices 111 to 114. The following description will be given taking the radio communication apparatus shown in fig. 2 as an example of a terminal apparatus. The terminal equipment can execute the method provided by the embodiment of the invention. The terminal device may be any one of 4 terminal devices 111 to 114. The terminal device comprises a transceiver 201, a memory 203 and a processor 204 for implementing wireless communication functions.
The transceiver 201 may be used to support the transmission and reception of information between the terminal devices 111-114 and the network device 101. In the downlink, a downlink radio frequency signal from the network device is received via an antenna, demodulated by the transceiver 201, extracted from the baseband signal and output to the processor 204 for processing, so as to recover the traffic data and/or signaling information sent by the network device. On the uplink, a baseband signal carrying traffic data and/or signaling messages to be transmitted to the network device is modulated by the transceiver 201 to generate an uplink radio frequency signal, which is transmitted to the network device via the antenna. The transceiver 201 may also be used to support the transceiving of information between the terminal devices 111-114. In the side link receiving direction, side link radio frequency signals from other terminal devices are received via an antenna, demodulated by the transceiver 201, extracted and output to the processor 204 for processing, so as to recover service data and/or signaling information sent by other terminal devices. In the side link transmission direction, a baseband signal carrying traffic data and/or signaling messages to be transmitted to other terminal devices is modulated by the transceiver 201 to generate a side link radio frequency signal, and is transmitted to other terminal devices via the antenna. The transceiver 201 may include separate receiver and transmitter circuits, or may be integrated in the same circuit to perform the transceiving function.
Processor 204 may be a modem processor (modem processor). The processor 204 may include a baseband processor (BBP) that processes the digitized received signal to extract the information or data bits carried in the signal. For this purpose, the BBP is typically implemented in one or more Digital Signal Processors (DSPs) within the processor 204 or by a separate Integrated Circuit (IC).
For example, as shown in FIG. 2, processor 204 may include an encoder 2041, a modulator 2042, a decoder 2043, and a demodulator 2044. The encoder 2041 is used to encode a signal to be transmitted. For example, encoder 2041 may be used to receive traffic data and/or signaling messages to be transmitted on the uplink (or the sidelink) and to process (e.g., format, encode, interleave, or the like) the traffic data and signaling messages. The modulator 2042 is used to modulate the output signal of the encoder 2041. For example, the modulator may process symbol mapping and/or modulation, etc., of the encoder's output signals (data and/or signaling) and provide output samples. Demodulator 2044 is configured to perform demodulation processing on the input signal. For example, demodulator 2044 processes the input samples and provides symbol estimates. The decoder 2043 is used to decode the demodulated input signal. For example, the decoder 2043 deinterleaves, decodes, or the like the demodulated input signal, and outputs a decoded signal (data and/or signaling).
The processor 204 receives digitized data, which may represent voice, data, or control information, and processes the digitized data for transmission. The processor 204 may support one or more of various wireless communication protocols of various communication systems, such as Long Term Evolution (LTE) communication System, New Radio (NR), Universal Mobile Telecommunications System (UMTS), High Speed Packet Access (HSPA), and so on. Optionally, one or more memories may also be included in the processor 204.
The terminal device may also include an application processor (application processor)302 for generating the aforementioned digitized data that may represent voice, data, or control information.
The processor 204 and the application processor 202 may be integrated in one processor chip.
The memory 203 is used to store program code (also sometimes referred to as programs, instructions, software, etc.) and/or data used to support communication for the terminal devices.
It is to be noted that the memory 203 may include one or more memory units, for example, a memory unit inside the processor 204 or the application processor 202, or an external memory unit independent from the processor 204 or the application processor 202, or a component including a memory unit inside the processor 204 or the application processor 202 and an external memory unit independent from the processor 204 or the application processor 202.
The processor 204 may be a different type of processor. For example, the present invention may be implemented in a Central Processing Unit (CPU), a general purpose Processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, other Integrated circuits, or any combination thereof. The processor 204 may implement or execute the various illustrative logical blocks, modules, and circuits described in connection with the disclosure of embodiments of the invention. The processor may also be a combination of devices implementing computing functionality, including for example one or more microprocessor combinations, DSP and microprocessor combinations or system-on-a-chip (SOC) or the like.
Those of skill in the art would appreciate that the various illustrative logical blocks, modules, circuits, and algorithms described in connection with the aspects disclosed herein may be implemented as electronic hardware, instructions stored in a memory or another computer-readable medium and executed by a processor or other processing device, or combinations of both. As an example, the apparatus described herein may be used in any circuit, hardware component, IC, or IC chip. The memory disclosed herein may be any type and size of memory and may be configured to store any type of information as desired. To clearly illustrate this interchangeability, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. How such functionality is implemented depends upon the particular application, design choices, and/or design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present invention.
The terminal device working at the Mode4 selects a sending time period window based on history monitoring (Sensing) information or monitoring results, and selects a time period within the sending time period window to send control information and/or data. For convenience of description, in the embodiments of the present invention, control information and/or data are collectively referred to as information. For example, taking fig. 3 as an example, the terminal device listens for the time period n-1000 to the time period n-1, selects the transmission time period window from n + T1 to n + T2 according to the listening result, and selects n + T1+2 from the transmission time period window as the transmission time period n + tsselect transmission information. The upper edge of the transmission time interval window is to ensure the delay requirement of the service, so the transmission time interval window cannot be too large. Two or more terminal devices may therefore select the same frequency domain resources over the same transmission time period within the transmission time period window. At this time, the transmission information may fail because of collision. For the service with urgent delay requirement, the sending time period window is smaller, and the collision probability is larger.
In order to solve the above problem, an embodiment of the present invention provides an information sending method. In the method, the sending time period at least comprises a first time period, and the length of the first time period is less than that of the sending time period. The first time period includes a plurality of sub-time periods. When the first terminal device has data to transmit, the first terminal device may select a transmission time period window according to the history listening information (or listening result). The first terminal device then selects a transmission time period in the transmission time period window. The first terminal device selects a target sub-period from the first period of the selected transmission period. The first terminal device may listen for at least one sub-period of time prior to the target sub-period of time in the selected first time period. Specifically, the first terminal device may monitor, at each monitored sub-period, indication information that frequency domain resources sent by other terminal devices are occupied. And if the indication information is not monitored or the indication information does not need to be monitored, the first terminal equipment sends the indication information that the frequency domain resources are occupied in the target sub-time period, and the indication information is used for indicating that the target frequency domain resources in the target time period are occupied. After the first terminal device sends the indication information that the frequency domain resources are occupied, in a second time period, the target frequency domain resources can be used for sending information. According to the method provided by the embodiment of the invention, the sending time period is divided into two parts, and the first time period is divided into a plurality of sub-time periods, so that a plurality of terminal devices can select different sub-time periods to send the frequency domain resource occupation indication information. Compared with the method that the terminal equipment directly uses the frequency domain resource in the selected sending time period to send the information, the method provided by the embodiment of the invention can effectively reduce the collision probability between the terminal equipment, thereby reducing the time delay.
The structure of the time period in the time domain and the structure of the frequency domain resources included in the frequency domain are described below, respectively.
(1) Structure of time segments in time domain
Fig. 4 is a schematic diagram of a transmission time period window and a transmission time period structure according to various embodiments of the present invention.
It is to be noted that, in the embodiments of the present invention, the time structure (time axis) is constituted by a plurality of time segments which are continuous in time. The one period may specifically be one transmission period as in fig. 4.
As shown in fig. 4, a window of transmission time periods includes one or more transmission time periods, and a box within the window of transmission time periods represents a transmission time period. Any one period may be used as the transmission period. One Transmission period may include a length of one or more slots (slots), or a length of one or more Mini-slots (Mini-slots), or a length of one or more subframes, or a length of one or more Transmission Time Intervals (TTIs), or one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols, which is not limited by the embodiments of the present invention. For example, in the LTE system, one transmission period may be one Subframe (Subframe). The length of one subframe is 1 Millisecond (ms). One subframe includes 2 slots. One subframe includes 14 OFDM symbols (using a cyclic prefix of a normal length) or 12 OFDM symbols (using a cyclic prefix of an extended length). The length of one TTI is equal to the length of one subframe or includes the length of one slot or less. As another example, in a 5G system, a transmission period may include a mini-slot. One mini slot includes 1 or more OFDM symbols. It should be noted that the transmission time period in each embodiment of the present invention is not limited to the LTE system or the 5G system, and may also be applied to other systems, and the embodiments of the present invention are not limited thereto.
For convenience of description, the time slot is taken as an example to represent the time period in the embodiments of the present invention. Accordingly, the sub-period may also be referred to as a short time slot, or a fast listening time slot.
The transmission period includes a first period and a second period. The second time period is located after the first time period. I.e. in chronological order, a first time period and a second time period, respectively. The terminal device may listen to and/or transmit the frequency domain resource occupancy indication information using the first time period. The terminal device may transmit information using the second time period.
The first and second periods are described below, respectively.
(a) A first time period. The first time period includes N sub-time periods, N is a positive integer, and N > 1. Such as N-4. As shown in fig. 4, a box filled with a horizontal line in the first period represents a sub-period. The first time period is used for the terminal equipment to monitor and/or send the frequency domain resource occupation indication information. That is, the first time period is used for coordinating frequency domain resources of the current transmission time period among the plurality of terminal devices. One sub-period may include one or more OFDM symbols. In one implementation, the first time period includes X OFDM symbols, where X is a positive integer. For convenience of description, in the embodiments of the present invention, the OFDM symbol included in the first time period is referred to as a first OFDM symbol. That is, the first time period includes X first OFDM symbols. In another implementation, one sub-slot length may be 9 microseconds (μ β). The length of the first period is not limited in the present invention. The first time period includes a first portion and a second portion in a time domain. The first portion includes N1 sub-periods for listening and/or transmitting frequency domain resource occupancy indication information, where N1 is a positive integer and N1< N. The second part includes N2 sub-periods for Automatic Gain Control (AGC), where N2 is a positive integer and N1+ N2 is ≦ N. That is, of the N sub-periods, N1 sub-periods are used for the terminal device to listen to and/or transmit the frequency domain resource occupation indication information, and N2 sub-periods are used for AGC. In one implementation, the second portion is located at or after the last N2 sub-time periods in the first time period. In another implementation, the second portion may be located at the first most N2 sub-time periods of the first time period or before the first portion. The terminal equipment adjusts the received Signal strength by Automatic Gain Control (AGC), thereby ensuring the Signal-to-Noise Ratio (SNR) required by the terminal equipment for correct decoding. For example, when the received signal strength is weak, the terminal device amplifies the signal strength by AGC to improve the SNR to a reasonable range. When the received signal strength is strong, the terminal equipment weakens the received signal strength through AGC, and the receiving performance deterioration caused by the fact that the signal strength exceeds a reasonable range is avoided. Since the communication of V2X may be in the case of one-to-many, many-to-one and many-to-many communication, and the distances between different terminal devices may be different, it is easy to cause the strength of signals received by the terminal devices to vary greatly. Therefore, the terminal device adjusts the received signal strength by the AGC to improve the reception performance.
(b) A second time period. The second time period includes one or more OFDM symbols. In one implementation, the second time period includes Y OFDM symbols, where Y is a positive integer. For convenience of description, in the embodiments of the present invention, the OFDM symbol included in the second time period is referred to as a second OFDM symbol. That is, the second period includes Y second OFDM symbols.
In the embodiments of the present invention, the subcarrier spacing of the first OFDM symbol and the second OFDM symbol may be the same or different. In one implementation, the subcarrier spacing employed by the first OFDM symbol is equal to the subcarrier spacing employed by the second OFDM symbol. In another implementation, the first OFDM symbol employs a subcarrier spacing that is greater than a subcarrier spacing employed by the second OFDM symbol. In another implementation, the subcarrier spacing employed by the first OFDM symbol is an integer multiple of the subcarrier spacing employed by the second OFDM symbol. For example, the first OFDM symbol and the second OFDM symbol may each employ a subcarrier spacing of 15 KHz. Or the first OFDM symbol adopts 30KHz, 60KHz or 120KHz sub-carrier spacing, and the second OFDM symbol adopts 15KHz sub-carrier spacing. The embodiments of the present invention do not limit the specific subcarrier spacing used by the first OFDM symbol and the second OFDM symbol.
(2) Structure of frequency domain resources comprised by a time segment in the frequency domain
A time period includes a set of frequency domain resources in the frequency domain, where the set of frequency domain resources includes one or more frequency domain resources. If the set of frequency domain resources comprises a plurality of frequency domain resources, the plurality of frequency domain resources are frequency division multiplexed therebetween. One frequency domain resource occupies a certain width in the frequency domain. For example, one frequency domain Resource may occupy 180KHz, or one frequency domain Resource may occupy 1 Physical Resource Block (PRB), or one frequency domain Resource may occupy 6 subcarriers. A frequency domain resource may include resources (e.g., PRBs, or subcarriers) that are continuous or discrete in the frequency domain, which is not limited in the embodiments of the present invention. The frequency domain resource may specifically be a single-slot resource (single-slot resource), or a radio resource, or a time-frequency resource. The frequency domain resource set may be a single timeslot resource set, or a radio resource set, or a time-frequency resource set. The frequency domain resources may be used for a Physical Sidelink Control Channel (PSCCH) and/or a Physical Sidelink Shared Channel (PSCCH). When the frequency domain resource is a single time slot resource, a time segment includes a single time slot resource set including one or more single time slot resources. A single slot resource may be used for PSCCH and/or PSCCH. That is, a single slot resource may be used for transmission of side link control signaling and/or data.
For convenience of description, a portion of the frequency domain resources located in each sub-period in the first period is referred to as first frequency domain resources, and a portion of the frequency domain resources located in the second period is referred to as second frequency domain resources. That is, the first frequency domain resource belongs to a frequency domain resource, and the first frequency domain resource is located in a first time segment part of the frequency domain resource; the second frequency domain resources belong to frequency domain resources and are located in a second time segment portion of the frequency domain resources. Each first frequency domain resource corresponds to one second frequency domain resource. In one implementation, the first frequency domain resource and the second frequency domain resource are the same resource (same frequency) in the frequency domain, and only occupy different times in a time period. Another way to achieve this is that the first frequency domain resources are different from the second frequency domain resources in the frequency domain, but in a one-to-one correspondence. For example, the correspondence between the first frequency domain resource and the second frequency domain resource includes that the first frequency domain resource 1 corresponds to the second frequency domain resource 2, the first frequency domain resource 2 corresponds to the second frequency domain resource 3, and the first frequency domain resource 3 corresponds to the second frequency domain resource 1. The corresponding relationship between the first frequency domain resource and the second frequency domain resource may be configured by a higher layer of the network device or the terminal device, or may be fixed in a protocol.
The first frequency domain resource is used for sending indication information, indicating occupied frequency domain resources or indicating occupied second frequency domain resources. The second frequency domain resource is used for transmitting information.
The time period structure related parameter comprises at least one of: the length of the first time period and/or the second time period, the value of N, the length of the sub-time period, the subcarrier interval of the first OFDM symbol used in the first time period, the number of first OFDM symbols included in the sub-time period in the first time period, the value of N1 and/or N2, the number of second OFDM symbols included in the second time period, the subcarrier interval used in the second OFDM symbols, the number of frequency domain resources included in one time period (i.e., the first time period and the second time period), and the width of each frequency domain resource in the frequency domain. One or more of the parameters related to the time slot structure may be fixed in protocol, or configured by a higher layer of the terminal device, or configured by the network device through a physical layer Control signaling, a Media Access Control (MAC) layer Control signaling, or a Radio Resource Control (RRC) layer signaling. When the parameters related to the time slot structure are configured by the network device through RRC layer signaling, the RRC layer signaling may be a dedicated RRC message or a system broadcast message. The higher layer may be a MAC layer, an RRC layer, or a higher layer.
The terminal equipment monitors one or more sub-time periods in the first time period, and indication information is sent on one first frequency domain resource of one sub-time period. The indication information is used for indicating that the second frequency domain resource corresponding to the first frequency domain resource is occupied. Through the time period structure and the time period method, the terminal equipment can coordinate the frequency domain resources of the current time period with other terminal equipment so as to reduce the collision probability.
An exemplary time period structure is described as follows:
assuming that the period is a slot and sub-carrier space (SCS) of the OFDM symbol is 15KHz, a normal Cyclic Prefix (CP) is employed. One slot includes 14 OFDM symbols. In one implementation, the first time period includes a first OFDM symbol in the slot. The first time period is used for listening and/or sending indication information, i.e. for indicating which frequency domain resource is occupied. Alternatively, the first symbol is used for Fast Sensing (Fast Sensing). The first OFDM symbol may also be used for AGC.
The first OFDM symbol includes N Short-Sensing slots (sSS), where N is a positive integer. That is, the first OFDM symbol includes N sub-periods. Specifically, the first OFDM symbol includes { sSS }0，sSS1,…,sSSN-1}. Wherein
Figure BDA0001594251870000101
LOFDM＿symbolIs the symbol length of the first OFDM, LsSSOne sSS length. I.e. N is LOFDM＿symbolAnd LsSSThe division is rounded down. The length of sSSN-1 is more than or equal to LsSSI.e. the length of the last sSS may be greater than LsSS. Assuming that N is 5, the first N1 is 4 sSS for fast listening. The last N2 ═ 1 sSS for AGC, i.e., { sSS0，sSS1,…,sSS3For fast interception, sSS5For AGC. In another implementation, the first time period may include the first k OFDM symbols in the slot, k being a positive integer and k ≦ 14. For example, the first time period includes the first 2 (i.e., k ═ 2) OFDM symbols in the slot, or includes the first 3 (i.e., k ═ 3) OFDM symbols in the slot. The first time period includes N short listening slots. Accordingly, the length of one sSS can vary accordingly based on the above description and will not be described in detail herein.
A method for transmitting information according to an embodiment of the present invention is described below with reference to a time slot structure shown in fig. 4.
The terminal device in each embodiment of the present invention may be any one of the terminal devices 111 to 114 in fig. 1. For convenience of description, the following description will be made by taking the terminal device as the terminal device 111.
Fig. 5 is a flowchart illustrating a method for sending information according to an embodiment of the present invention. The method comprises the following steps:
s501, the terminal device determines a sending time period.
Before determining the sending time period, when the side link data reaches the time period n and needs to be sent to other terminal equipment, the terminal equipment determines a sending time period window [ n + T1, n + T2] according to the historical monitoring information (or monitoring result) and the requirement of a high layer, wherein T1 and T2 are integers, T1 is more than or equal to 0, and T2 is more than or equal to 0. The high layer may be a MAC layer, a Radio Link Control (RLC) layer, a Packet Data Convergence (PDCP) layer, a Service Data Adaptation (SADP) layer, an RRC layer, or a higher layer.
The terminal device monitors in at least one of the L time periods before the sending time period window, or monitors in at least one of the L time periods before the time period n. The terminal device monitors whether at least one frequency domain resource is occupied by other terminal devices in at least one time slot of the L time slots, or monitors whether at least one frequency domain resource is idle or busy, or monitors whether at least one frequency domain resource is available. Generally, the terminal device determines whether a frequency domain resource is available by receiving energy on the frequency domain resource, for example, if the terminal device monitors that energy of a Received Signal or a Received Signal Strength Indication (RSSI) on a certain frequency domain resource is greater than or equal to a certain threshold, the terminal device considers that the frequency domain resource is unavailable, or considers that the frequency domain resource is busy, or considers that the frequency domain resource is used by other terminal devices. On the contrary, if the energy of the received signal is less than a certain threshold, the terminal device considers that the frequency domain resource is available, or considers that the frequency domain resource is idle, that is, the frequency domain resource is an available frequency domain resource, and a set composed of one or more available frequency domain resources is an available frequency domain resource set.
And the terminal equipment determines a sending time period window according to the historical monitoring information. The terminal device selects a time period n + tsselect as a transmission time period from the transmission time period window. T1 is not less than n + tsselect is not less than T2, and tsselect is a natural number. The terminal device may randomly select a period of time in the transmission period window as the transmission period. The terminal device may also select a time period in the sending time period window as the sending time period according to a certain rule. The rule may be fixed in protocol, or configured by a higher layer of the terminal device, or configured by the network device through a physical layer Control signaling, a Media Access Control (MAC) layer Control signaling, or a Radio Resource Control (RRC) layer signaling. When the rule is configured by the network device through RRC layer signaling, the RRC layer signaling may be a dedicated RRC message or a system broadcast message. The higher layer may be a MAC layer, an RRC layer, or a higher layer. The embodiments of the present invention are not limited.
In one implementation, the processor 201 of the terminal device may be configured to determine the transmission time period.
S502, the terminal equipment selects the target frequency domain resource.
The terminal device may determine the set of available frequency domain resources over the transmission time period n + tsselect according to the historical listening information. The set of available frequency domain resources includes J available frequency domain resources, J being a natural number. For example, the set of available frequency domain resources includes J available single slot resources. J available single time slot resources are respectively represented as R0,n+Tselect，R1,n+Tselect，…，RJ-1,n+Tselect. It is to be understood that the number of frequency domain resources included in the set of available frequency domain resources in a time period is less than or equal to the number of frequency domain resources included in the set of frequency domain resources in the time period. It is to be understood that the terminal device determines the transmission time period to include at least one available frequency domain resource. That is, the available set of frequency domain resources in the transmission time period determined by the terminal device is not empty.
The target frequency domain resource belongs to a set of available frequency domain resources. It should be noted that, since the terminal device uses the frequency domain resources in the available frequency domain resource set to transmit information, the available frequency domain resource set mentioned in the embodiments of the present invention may be a set of available second frequency domain resources in the second time period. Accordingly, the terminal device determining the target frequency domain resource may be the terminal device determining the target second frequency domain resource in the second time period. The set of available frequency domain resources may also be a set of available second frequency domain resources in the first time period and the second time period, or a set of frequency domain resources of the transmission time period. Correspondingly, the terminal device may determine the target frequency domain resource in the first time period and the second time period, or may determine the target frequency domain resource in the transmission time period. If the available frequency domain resource set in the transmission time period only comprises one frequency domain resource, the terminal equipment determines the frequency domain resource as the target frequency domain resource. If the set of available frequency domain resources for the transmission time period includes two or more frequency domain resources, the terminal device selects one frequency domain resource from the set of available frequency domain resources as a target frequency domain resource. The terminal device may randomly select one available frequency domain resource from the set of available frequency domain resources as the target frequency domain resource. The terminal device may also select one available frequency domain resource from the available frequency domain resource set as a target frequency domain resource according to a certain rule. The rule may be fixed in protocol, or configured by a higher layer of the terminal device, or configured by the network device through a physical layer Control signaling, a Media Access Control (MAC) layer Control signaling, or a Radio Resource Control (RRC) layer signaling. When the rule is configured by the network device through RRC layer signaling, the RRC layer signaling may be a dedicated RRC message or a system broadcast message. The higher layer may be a MAC layer, an RRC layer, or a higher layer. The embodiments of the present invention are not limited.
In one implementation, the terminal device processor 204 may be configured to determine the target frequency domain resource.
S503, the terminal device determines a target sub-period.
The terminal equipment determines a target sub-time period from the sub-time periods included in the first time period. Specifically, the terminal device determines a target sub-period from the sub-periods included in the first part of the first period. For convenience of description, the target sub-period is sSSTargetTo indicate.
In one implementation, the terminal device may randomly select one sub-period from among the sub-periods included in the first part of the first period as the target sub-period. For example, assume that the first period includes 4 sub-periods, sub-period 0, sub-period 1, sub-period 2, and sub-period 3. The terminal device may select sub-period 1 as the target sub-period.
In a second implementation manner, the terminal device may further determine, according to a certain rule, one sub-period as the target sub-period from among the sub-periods included in the first part of the first period. The rule may be fixed in protocol, or configured by a higher layer of the terminal device, or configured by the network device through a physical layer Control signaling, a Media Access Control (MAC) layer Control signaling, or a Radio Resource Control (RRC) layer signaling. When the rule is configured by the network device through RRC layer signaling, the RRC layer signaling may be a dedicated RRC message or a system broadcast message. The higher layer may be a MAC layer, an RRC layer, or a higher layer. The embodiments of the present invention are not limited.
Based on the second implementation manner, the terminal device may randomly select a number i within the preconfigured threshold value, where i is a natural number and i is less than or equal to the preconfigured threshold value. The terminal device takes the ith sub-period in the first part of the first period as a target sub-period. Different terminal devices can configure different thresholds to reflect different delay requirements of services of different terminal devices or different priorities of the services.
Based on the second implementation, the terminal device may start a counter (or timer). The counter is initialized to 0. The counter starts counting from a first sub-period of a first part of the first period. And after a sub-time period elapses and the terminal device does not monitor the indication information that the target frequency domain resource sent by other terminal devices is occupied in the sub-time period, adding 1 to the counter. And when the counter reaches C or C-1, the terminal equipment determines the sub-time period as the target sub-time period. To a randomly selected value C or a preconfigured threshold value C, or to a randomly selected value C-1 or a preconfigured threshold value C-1, C being randomly selected for the terminal device from 0 to N1, or C being preconfigured. C is a natural number and is more than or equal to 0 and less than or equal to N1. For example, assuming that C is 2 and the counter reaches 2, the corresponding sub-period is determined as the target sub-period. The first sub-period counter is equal to 0. And if the terminal equipment does not monitor the indication information that the target frequency domain resource sent by other terminal equipment is occupied in the first sub-time period, adding 1 to the counter. The second sub-period counter equals 1. If the terminal equipment does not monitor the occupied indication information of the target frequency domain resource sent by other terminal equipment in the second sub-time period, adding 1 to the counter; the third sub-period counter is equal to 2. And the terminal equipment determines that the third sub-time period is the target sub-time period. The terminal device may stop the counter if it monitors indication information that the target frequency domain resource sent by other terminal devices is occupied. And if the indication information that the target frequency domain resource sent by other terminal equipment is occupied is monitored, the terminal equipment does not send information in the time period. For example, assuming that C is 2, if the first sub-period monitors indication information that the target frequency domain resource sent by the other terminal device is occupied, the terminal device determines that the target frequency domain resource is occupied by the other terminal device, and the terminal device does not use the period to send information any more.
Based on the second implementation, the terminal device may start a counter (or timer). The counter has an initial value of C. C is randomly selected from 0 to N1 for the terminal device, or C is preconfigured. C is a natural number and is more than or equal to 0 and less than or equal to N1. The counter starts counting from a first sub-period of a first part of the first period. And after every sub-time period which does not monitor the indication information that the target frequency domain resource sent by other terminal equipment is occupied, the counter is decreased by 1. When the counter is decremented to 0 or 1 or-1, the terminal device determines that the sub-period is the target sub-period. For example, assuming that C is 2, the first sub-period counter is equal to 2. And if the terminal equipment does not monitor the indication information that the target frequency domain resource sent by other terminal equipment is occupied in the first sub-time period, the counter is decreased by 1. The second sub-period counter equals 1. And if the second sub-period does not monitor the indication information that the target frequency domain resource sent by other terminal equipment is occupied, the counter is decreased by 1. The third sub-period counter is equal to 0. And the terminal equipment determines that the third sub-time period is the target sub-time period. The terminal device may stop the counter if it monitors indication information that the target frequency domain resource sent by other terminal devices is occupied. And if the indication information that the target frequency domain resource sent by other terminal equipment is occupied is monitored, the terminal equipment does not send information in the time period. For example, assuming that C is 2, if the first sub-period monitors indication information that the target frequency domain resource sent by the other terminal device is occupied, the terminal device determines that the target frequency domain resource is occupied by the other terminal device, and the terminal device does not use the period to send information any more.
When C is preconfigured, C may be configured by a higher layer of the terminal device, or configured by the network device through a physical layer Control signaling, a Media Access Control (MAC) layer Control signaling, or a Radio Resource Control (RRC) layer signaling. When C is configured by the network device through RRC layer signaling, the RRC layer signaling may be a dedicated RRC message or a system broadcast message. The higher layer may be a MAC layer, an RRC layer, or a higher layer. The embodiments of the present invention are not limited.
It is understood that the order of S502 and S503 may be reversed, and all the purposes of the embodiments of the present invention may be achieved. That is, the terminal device may first determine the target sub-period and then determine the target frequency domain resource.
In one implementation, the processor 204 of the terminal device may be configured to determine the target sub-period.
S504, the terminal device monitors the indication information that the target frequency domain resource sent by other terminal devices is occupied.
The indication information indicates that the target frequency domain resource is occupied by other terminal equipment. The indication information is any information (for example, all 0 s) transmitted on the frequency domain resource corresponding to the target frequency domain resource, the information may not be decoded, and the terminal device may determine whether the target frequency domain resource corresponding to the frequency domain resource is occupied by other terminal devices only by detecting whether the signal energy (or RSSI) on the frequency domain resource is greater than or equal to a certain threshold. When the first frequency domain resource and the second frequency domain resource are the same resource (same frequency) in the frequency domain, the terminal device may monitor a portion of the target frequency domain resource located in the sub-period of the first period. For example, the terminal device determines whether to receive the indication information that the target frequency domain resource is occupied according to whether the received signal energy (or RSSI) on the target frequency domain resource is greater than or equal to a threshold value thast _ scanning. When the first frequency domain resource corresponds to the second frequency domain resource in the frequency domain, the terminal device may listen to the first frequency domain resource corresponding to the target frequency domain resource. For example, assuming that the target resource is the second frequency domain resource 3, which corresponds to the first frequency domain resource 1, the terminal device determines whether to receive the indication information that the second frequency domain resource 3 is occupied according to whether the received signal energy (or RSSI) on the first frequency domain resource 1 is greater than or equal to the threshold value Thfast _ searching. The threshold value Thfast _ scanning may be fixed in protocol, or configured by a higher layer of the terminal device, or configured by the network device through a physical layer Control signaling, a Media Access Control (MAC) layer Control signaling, or a Radio Resource Control (RRC) layer signaling. When configured by RRC layer signaling, the RRC layer signaling may be a dedicated RRC message or a system broadcast message. The higher layer may be a MAC layer, an RRC layer, or a higher layer. The embodiments of the present invention are not limited.
And if the target sub-time period is not the first sub-time period of the first part of the first time period, the terminal equipment monitors indication information that the target frequency domain resources sent by other terminal equipment are occupied on at least one sub-time period before the target sub-time period.
If the target sub-time period is the first sub-time period of the first part of the first time period, the terminal device does not need to monitor the indication information that the target frequency domain resource sent by other terminal devices is occupied. At this time, the terminal device performs S505, that is, directly transmits the target frequency domain resource occupation indication information at the portion where the target frequency domain resource is located in the target sub-period.
The terminal device starts to monitor from the first sub-time period, and each subsequent sub-time period needs to monitor until the previous time period of the target sub-time period is monitored or indication information that the target frequency domain resource is occupied is monitored.
When the terminal device determines the target sub-period through the second implementation of step S503, the terminal device may listen to the indication information on the sub-period before the counter satisfies the condition. For example, assuming that the counter counts up, the terminal device listens for the indication information during the sub-period when the counter is smaller than C. Or, assuming that the counter adopts a subtraction count, when the counter is greater than 0, the terminal device listens for the indication information over the sub-period.
And if the terminal determines that the indication information that the target frequency domain resource is occupied is received in a sub-time period before the target sub-time period, finishing the operation of the time period. Such asAnd the terminal equipment does not send the indication information that the target frequency domain resource is occupied, and/or the terminal equipment stops monitoring the subsequent sub-time period, and/or the terminal equipment does not send the information on the target frequency domain resource in the second time period. For example, assume that the current sub-period is sSSi,i＝0,1,…sSSTarget-1. When the Received Signal Strength Indication (RSSI) of the terminal device on the target frequency resource is greater than or equal to the threshold value Thfast _ searching, the operation of the time period is ended.
If the terminal device does not monitor the indication information sent by other terminal devices in a sub-time period before the target sub-time period, and the next sub-time period is not the target sub-time period, the terminal device continues to monitor the indication information in the next sub-time period. If the next sub-period is the target sub-period, the terminal device performs S505.
In one implementation, the transceiver 201 of the terminal device may be configured to listen for the indication information. Alternatively, the processor 204 of the terminal device controls the transceiver 201 to listen for the indication information.
And S505, the terminal equipment sends the indication information that the target frequency domain resource is occupied in the target sub-time period.
When the first frequency domain resource and the second frequency domain resource are the same resource (same frequency) in the frequency domain, the terminal device sends the indication information in the part of the target frequency domain resource located in the target sub-time period. For example, assuming that the target frequency domain resource is the second frequency domain resource 3, the terminal device transmits the indication information using the first frequency domain resource 3 in the target sub-period. When the first frequency domain resource corresponds to the second frequency domain resource in the frequency domain, the terminal equipment sends the indication information by using the first frequency domain resource corresponding to the target frequency domain resource in the target sub-time period. For example, assuming that the target frequency domain resource is the second frequency domain resource 3 and the corresponding first frequency domain resource is the first frequency domain resource 1, the terminal device sends the indication information using the first frequency domain resource 1 in the target sub-period to indicate that the second frequency domain resource 3 is occupied.
The transmitted indication information is the same as the indication information monitored in step S503. And will not be described in detail.
In one implementation, the transceiver 201 of the terminal device may be used to transmit the indication information. Alternatively, the terminal device processor 204 controls the transceiver 201 to transmit the indication information.
S506, the terminal equipment sends information on the target frequency domain resource of the second time period.
The information sent by the terminal device on the target frequency domain resource in the second time period may be a control signaling or data, and the embodiment of the present invention is not limited.
The terminal device transmits information using a second frequency domain resource of the target frequency domain resources.
And after the step is executed, the operation in the time period is finished.
In one possible implementation, the transceiver 201 of the terminal device may be used to transmit information. Alternatively, the processor 204 of the terminal device controls the transceiver 201 to transmit information.
The terminal equipment can send the indication information that the target frequency domain resource is occupied in advance by executing the method of the embodiment of the invention so as to avoid collision between other terminal equipment and the terminal equipment. Monitoring the indication information of occupied target frequency domain resources sent by other terminal equipment before sending the indication information of occupied target frequency domain resources, thereby avoiding collision between the terminal equipment and other terminal equipment, reducing collision probability and reducing time delay.
Fig. 6 is a flowchart illustrating a method for sending information according to another embodiment of the present invention. The method comprises the following steps:
s601 is the same as S501, and is not described herein.
S602 is the same as S503, and is not described herein.
S603, the terminal equipment monitors the indication information that the frequency domain resources are occupied.
This step S603 is similar to S504.
The difference between this step and S504 is that in this step, the terminal device does not determine the target resource in advance, but monitors whether a plurality of available frequency domain resources in the available frequency domain resource set are occupied by other terminal devices. Therefore, the terminal device can listen to the indication information that the plurality of frequency domain resources are occupied. Since multiple other terminal devices may select the same target sub-period but different target frequency domain resources. The terminal device can receive a plurality of indication information at the same time. The plurality of indication information indicates that a plurality of frequency domain resources are occupied. One indication information indicates that one frequency domain resource is occupied. The occupied frequency domain resource indicated in the indication information monitored in this step may be the second frequency domain resource. When the first frequency domain resource and the second frequency domain resource are the same resource (same frequency) in the frequency domain, the terminal device monitors the occupied indication information of the second frequency domain resource i on the first frequency domain resource i in the sub-time period of the first time period, wherein i is a natural number. When the first frequency domain resource corresponds to the second frequency domain resource in the frequency domain, the terminal device monitors the first frequency domain resource i of the first time period sub-time period for the indication information that the second frequency domain resource j is occupied. The first frequency domain resource i corresponds to the second frequency domain resource j, and i and j are natural numbers. Please refer to step S501 for a corresponding relationship between the first frequency resource i and the second frequency resource j.
For convenience of description, the embodiment of the present invention introduces a candidate frequency domain resource set. The set of candidate frequency domain resources is a subset of the set of available frequency domain resources. The set of candidate frequency domain resources may include frequency domain resources that are second frequency domain resources located at a second time period. The set of candidate frequency domain resources is the same as the set of available frequency domain resources while listening for a first sub-period of a first portion of the first time period. And after the terminal equipment receives the one or more pieces of indication information in one sub-time period, deleting one or more frequency domain resources corresponding to the one or more pieces of indication information from the available frequency domain resource set. At this time, the candidate set of frequency domain resources includes one or more frequency domain resources of the available set of frequency domain resources except for the deleted frequency domain resource. Before the target sub-time period, and the next sub-time period is not the target sub-time period, if the candidate frequency domain resource set is not empty, that is, at least one frequency domain resource in the available frequency domain resource set is not occupied by other terminals, the terminal device continues to monitor the indication information that at least one frequency domain resource in the candidate frequency domain resource set is occupied in the next sub-time period. When the candidate frequency domain resource set is empty in a sub-time period before the target sub-time period, that is, all the frequency domain resources in the available frequency domain resource set are occupied by other terminal users, the terminal device ends the operation in the time period. For example, the terminal device does not send the indication information that the frequency domain resource is occupied, and/or the terminal device stops monitoring the subsequent sub-time period, and/or the terminal device does not send information in the second time period. For example, assume that the available set of frequency domain resources includes a second frequency domain resource 1, 2, 3, 4, and the target sub-period is sub-period 2. At this time, the candidate set of frequency domain resources also includes the second frequency domain resources 1, 2, 3, 4. It is assumed that the terminal device listens for the indication that the second frequency domain resource 1, 3 is occupied during the sub-period 0. Then the set of candidate frequency domain resources comprises only the second frequency domain resources 2, 4 when listening for sub-period 1. It is assumed that the terminal device again listens for the indication that the second frequency domain resource 2, 4 is occupied during time sub-period 1. Then in sub-period 2 (i.e. the target sub-period) the set of candidate frequency domain resources is an empty set, i.e. does not include any second frequency domain resources.
If the target sub-time period is not the first sub-time period of the first part of the first time period, the terminal device monitors the indication information sent by other terminal devices in at least one sub-time period before the target sub-time period. If the target sub-period is the first sub-period of the first part of the first period, the terminal device does not need to listen to the indication information sent by other terminal devices. At this time, the terminal device executes S604. If the candidate frequency domain resource set is not empty and the next sub-time period is the target sub-time period after the terminal device monitors the current sub-time, the terminal device performs S604.
In one possible implementation, the transceiver 201 of the terminal device may be configured to listen for an indication that the frequency domain resources are occupied. Alternatively, the processor 204 of the terminal device controls the transceiver 201 to listen for the indication that the frequency domain resources are occupied.
S604, the terminal equipment selects one frequency domain resource from the candidate frequency domain resource set as a target frequency domain resource. That is, the terminal device determines the target frequency domain resource.
The set of candidate frequency domain resources is a subset of the available frequency domain resources and does not include frequency domain resources occupied by other terminal devices. And the terminal equipment acquires a candidate frequency domain resource set according to the received indication information that one or more frequency domain resources are occupied. The terminal equipment selects a target frequency domain resource from at least one frequency domain resource included in the candidate frequency domain resource set.
The difference between this step and S502 is that in this step, the terminal device selects one frequency domain resource from the candidate frequency domain resource set as the target frequency domain resource, and in S502, the terminal device selects one frequency domain resource from the available frequency domain resource set as the target frequency domain resource. In this step, the implementation manner of selecting the target frequency domain resource by the terminal device is similar to S502. And will not be described in detail.
In one possible implementation, the processor 204 of the terminal device may be configured to determine the target frequency domain resource.
S605 is the same as S505.
S606 is the same as S506.
The terminal equipment can send the target frequency domain resource occupation indication information in advance by executing the method provided by the embodiment of the invention so as to avoid collision between other terminal equipment and the terminal equipment. Monitoring one or more frequency domain resource occupation indication information sent by other terminal equipment before sending the target frequency domain resource occupation indication information, thereby selecting the frequency domain resource which is not occupied by other terminal equipment, further avoiding collision between the terminal equipment and the terminal equipment, further reducing collision probability and reducing time delay. Compared with the embodiment of the invention shown in fig. 5, the terminal device can monitor more frequency domain resources, thereby further reducing the collision probability and reducing the time delay.
Embodiments of the present invention also provide an apparatus (e.g., an integrated circuit, a wireless device, a circuit module, etc.) for implementing the above method. An apparatus implementing the description herein may be a standalone device or may be part of a larger device. The device may be (i) a free-standing IC; (ii) a set of one or more ICs, which may include memory ICs for storing data and/or instructions; (iii) RFICs, such as RF receivers or RF transmitter/receivers; (iv) an ASIC, such as a mobile station modem; (v) a module that may be embedded within other devices; (vi) a receiver, cellular telephone, wireless device, handset, or mobile unit; (vii) others, and so forth.
The method and the device provided by the embodiment of the invention can be applied to terminal equipment or network equipment (which can be collectively referred to as wireless equipment). The terminal device or network device or wireless device may include a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on top of 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 a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), 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 comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. Furthermore, in the embodiment of the present invention, the specific structure of the execution main body of the method is not limited in the embodiment of the present invention, as long as the communication can be performed by the method for transmitting a signal according to the embodiment of the present invention by running a program in which a code of the method of the embodiment of the present invention is recorded, for example, the execution main body of the method for wireless communication of the embodiment of the present invention may be a terminal device or a network device, or a functional module capable of calling the program and executing the program in the terminal device or the network device.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented as or make a contribution to the prior art, or may be implemented as a software product, which is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or an access network device) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only a specific implementation of the embodiments of the present invention, but the scope of the embodiments of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments of the present invention, and all such changes or substitutions should be covered by the scope of the embodiments of the present invention.

Claims (31)

1. A method for transmitting information, comprising:
the method comprises the steps that a first terminal device determines a sending time period, wherein the sending time period comprises a first time period, the length of the first time period is smaller than that of the sending time period, the first time period comprises N sub-time periods, N is a positive integer, and N > 1; the first time period comprises a first portion and a second portion;
the first part comprises N1 sub-time periods for monitoring and/or sending indication information that frequency domain resources are occupied, wherein N1 is a positive integer, N1 is smaller than N, and a target sub-time period is located in the first part;
the second portion includes N2 sub-periods for automatic gain control, AGC, N1+ N2 ≦ N;
the first terminal equipment determines the target sub-time period;
and the first terminal equipment sends indication information in the target sub-time period, wherein the indication information is used for indicating that target frequency domain resources are occupied, and the target frequency domain resources are located in the sending time period.
2. The method of claim 1, wherein the first terminal device transmitting the indication information in the target sub-period comprises:
and the first terminal equipment sends the indication information on the frequency domain resource corresponding to the target frequency domain resource in the target sub-time period.
3. The method according to any one of claims 1 to 2,
the time period further includes:
a second time period, the second time period being after the first time period;
after the first terminal device sends the indication information in the target sub-period, the method further includes:
and the first terminal equipment transmits information on the target frequency domain resource of the second time period.
4. The method of claim 1, wherein before the first terminal device sends the information indicating that the target frequency domain resource is occupied, the method further comprises:
the first terminal equipment selects one frequency domain resource from the available frequency domain resource set in the sending time period as a target frequency domain resource;
and the first terminal equipment monitors the indication information sent by other terminal equipment on the frequency domain resource corresponding to the target frequency domain resource in at least one sub-time period before the target sub-time period.
5. The method of claim 4, further comprising:
if the first terminal equipment monitors the indication information sent by other terminal equipment, the first terminal equipment does not send information on the target frequency domain resource in a second time period; and/or
And if the first terminal equipment does not monitor the indication information sent by other terminal equipment, the first terminal equipment sends information on the target frequency domain resource in a second time period.
6. The method of claim 1, comprising:
the first terminal equipment starts a counter, wherein an initial value C of the counter is randomly selected or preconfigured by the first terminal equipment, C is a natural number, and C is more than or equal to 0 and less than or equal to N1;
every time a sub-time period passes, and in the sub-time period, the first terminal equipment does not monitor the indication information sent by other terminal equipment, and the counter is decreased by 1;
and the first terminal equipment determines the corresponding sub-time period when the counter is reduced to 0 as the target sub-time period.
7. The method of claim 1, wherein before the first terminal device sends the information indicating that the target frequency domain resource is occupied, the method further comprises:
and the first terminal equipment monitors indication information sent by other terminal equipment in the available frequency domain resource set in the sending time period on at least one sub-time period before the target sub-time period.
8. The method of claim 7, further comprising:
the first terminal device selects one frequency domain resource from a candidate frequency domain resource set as a target frequency domain resource, wherein the candidate frequency domain resource set is a subset of the available frequency domain resources and does not include the frequency domain resources indicated by the indication information sent by other terminal devices monitored by the first terminal device.
9. The method of claim 1, wherein the first terminal device precedes the transmission time period, and further comprising:
the first terminal equipment determines a sending time period window, wherein the sending time period window comprises at least one time period, and the sending time period belongs to one time period in the sending time period window;
and the first terminal equipment selects a time period from the time period window as the sending time period.
10. The method of claim 9, further comprising:
and the first terminal equipment determines the time period window according to the service quality requirement of the information to be transmitted, wherein the service quality requirement comprises a time delay requirement.
11. The method according to any of claims 4 to 10, wherein before the first terminal device determines the target sub-period, further comprising:
and the first terminal equipment monitors at least one frequency domain resource in M time periods before the time period window, and determines an available frequency domain resource set in the time period, wherein M is a positive integer.
12. The method of claim 1, wherein the time period is any one of: slot, mini-slot, subframe, and transmission time interval TTI.
13. The method of claim 1,
the first time period comprises X first OFDM symbols, wherein X is a positive integer;
the second time period includes Y second OFDM symbols, where Y is a positive integer.
14. The method of claim 13, further comprising:
the first OFDM symbol and the second OFDM symbol have the same subcarrier interval;
alternatively, the first and second electrodes may be,
the first OFDM symbol and the second OFDM symbol have different subcarrier intervals.
15. An apparatus for transmitting information, comprising:
a processor and a transceiver coupled with the processor;
the transceiver is used for transmitting or receiving signals;
the processor is configured to determine a transmission time period, where the transmission time period includes a first time period, and a length of the first time period is smaller than a length of the transmission time period, the first time period includes N sub-time periods, N is a positive integer, and N > 1; the first time period comprises a first portion and a second portion;
the first part comprises N1 sub-time periods for monitoring and/or sending indication information that frequency domain resources are occupied, wherein N1 is a positive integer, N1 is smaller than N, and a target sub-time period is located in the first part;
the second portion includes N2 sub-periods for automatic gain control, N1+ N2 ≦ N;
the processor is further configured to select the target sub-time period;
the processor is further configured to send, by the transceiver, indication information in the target sub-period, where the indication information is used to indicate that a target frequency domain resource is occupied, and the target frequency domain resource is located in the sending period.
16. The apparatus of claim 15, wherein the sending the indication information in the target sub-period comprises:
the processor is configured to send, by the transceiver, the indication information on a frequency domain resource corresponding to the target frequency domain resource in the target sub-period.
17. The apparatus according to any one of claims 15 to 16,
the time period further includes:
a second time period, the second time period being after the first time period;
the processor, after sending the indication information in the target sub-period, is further configured to send information on the target frequency domain resource in the second period.
18. The apparatus of claim 15, wherein before sending the indication that the target frequency domain resource is occupied, further comprising:
the processor is configured to select one frequency domain resource from the set of available frequency domain resources in the sending time period as a target frequency domain resource;
the processor is further configured to monitor, by the transceiver, indication information sent by another terminal device on a frequency domain resource corresponding to the target frequency domain resource in at least one sub-time period before the target sub-time period.
19. The apparatus of claim 18, further comprising:
the processor is configured to determine that information is not sent on the target frequency domain resource in a second time period if the indication information sent by other terminal devices is monitored; and/or
The processor is configured to determine that information is transmitted on the target frequency domain resource in a second time period if the indication information transmitted by other terminal devices is not monitored.
20. The apparatus of claim 15, comprising:
the processor is used for starting a counter, wherein an initial value C of the counter is randomly selected or preconfigured by the first terminal equipment, C is a natural number, and C is more than or equal to 0 and less than or equal to N1;
the processor is further configured to decrement by 1 every time a sub-period elapses, and in the sub-period, if the first terminal device does not monitor the indication information sent by other terminal devices;
the processor is further configured to determine a sub-period corresponding to when the counter is decreased to 0 as the target sub-period.
21. The apparatus of claim 15, wherein before sending the indication that the target frequency domain resource is occupied, further comprising:
and the processor is configured to monitor, by the transceiver, indication information sent by other terminal devices in the set of available frequency domain resources in the sending time period in at least one sub-time period before the target sub-time period.
22. The apparatus of claim 21, further comprising:
the processor is configured to select a frequency domain resource from a candidate frequency domain resource set as a target frequency domain resource, where the candidate frequency domain resource set is a subset of the available frequency domain resources and does not include a frequency domain resource indicated by indication information sent by other terminal devices monitored by the first terminal device.
23. The apparatus of claim 15, wherein prior to the transmission time period, further comprising:
the processor is configured to determine a transmission time period window, where the transmission time period window includes at least one time period, and the transmission time period belongs to one time period in the transmission time period window;
the processor is further configured to select a time period from the time period window as the transmission time period.
24. The apparatus of claim 23, further comprising:
the processor is configured to determine the time period window according to a quality of service requirement of information to be sent, where the quality of service requirement includes a delay requirement.
25. The apparatus of any one of claims 18 to 24, further comprising, prior to determining the target sub-period of time:
the processor is configured to monitor, by the transceiver, at least one frequency domain resource in M time periods before a time period window, and determine an available frequency domain resource set in the time period, where M is a positive integer.
26. The apparatus of claim 15, wherein the time period is any one of: slot, mini-slot, subframe, and transmission time interval TTI.
27. The apparatus of claim 15,
the first time period comprises X first OFDM symbols, wherein X is a positive integer;
the second time period includes Y second OFDM symbols, where Y is a positive integer.
28. The apparatus of claim 27, further comprising:
the first OFDM symbol and the second OFDM symbol have the same subcarrier interval;
alternatively, the first and second electrodes may be,
the first OFDM symbol and the second OFDM symbol have different subcarrier intervals.
29. A computer storage medium, comprising:
computer software instructions for storing said first terminal device, comprising program instructions designed for carrying out the method of any one of claims 1 to 14.
30. A processor-readable storage medium comprising instructions that when executed on a processor cause the processor to perform the method of any of claims 1 to 14.
31. A communications apparatus, comprising:
a processor and a memory coupled with the processor, the processor including an input-output interface for sending and receiving signals, the memory for storing instructions, the processor for reading and executing the instructions in the memory to control the communication device to perform the method of any of claims 1 to 14.
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