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WO2016070390A1 - 数据传输的方法和设备 - Google Patents

数据传输的方法和设备 Download PDF

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Publication number
WO2016070390A1
WO2016070390A1 PCT/CN2014/090515 CN2014090515W WO2016070390A1 WO 2016070390 A1 WO2016070390 A1 WO 2016070390A1 CN 2014090515 W CN2014090515 W CN 2014090515W WO 2016070390 A1 WO2016070390 A1 WO 2016070390A1
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WO
WIPO (PCT)
Prior art keywords
time
candidate
moment
channel
moments
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2014/090515
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English (en)
French (fr)
Inventor
王键
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to US15/524,969 priority Critical patent/US10117183B2/en
Priority to JP2017542229A priority patent/JP6491346B2/ja
Priority to CN201910253575.7A priority patent/CN110099432B/zh
Priority to PCT/CN2014/090515 priority patent/WO2016070390A1/zh
Priority to KR1020177014487A priority patent/KR101943932B1/ko
Priority to EP14905425.6A priority patent/EP3206442B1/en
Priority to CN201480080820.4A priority patent/CN106537993B/zh
Publication of WO2016070390A1 publication Critical patent/WO2016070390A1/zh
Anticipated expiration legal-status Critical
Priority to US16/139,418 priority patent/US10405276B2/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Embodiments of the present invention relate to the field of communication technologies, and, more particularly, to a method and apparatus for data transmission.
  • the devices in the Long-Term Evolution-Assisted Access Using Long Term Evolution (LAA-LTE) system pass the Listening Before Listening Principle (English: Listen Before Talk, referred to as “LBT”) Use channel resources.
  • LBT Listen Before Talk
  • the working mode of the LBT is divided into a working mode based on load (English: Load Based Equipment, referred to as "LBE”) and a working mode based on Frame Based Equipment (FBE).
  • the receiving end device When performing data transmission in the LAA-LTE system, the receiving end device needs to continuously detect the channel to be able to acquire data, which makes the power consumption of the receiving end device relatively large.
  • Embodiments of the present invention provide a data transmission method and device, which can reduce power consumed by a device when receiving data.
  • an embodiment of the present invention provides a data transmission method, where a first device determines an alternate time set; the first device determines a target candidate time from the set of candidate moments; and the first device prepares according to the target Select the time to send data in the channel.
  • the determining, by the first device, the target candidate moment from the set of the candidate moments includes: determining, by the first device, the end of the CCA backoff procedure according to the idle channel, Determining the target candidate moment in the set of candidate moments; the first device transmitting data in the channel according to the target candidate moment, comprising: the first device starting to send data in the channel from the target candidate moment.
  • the first device determines, according to the idle channel, a time at which the CCA backoff process ends, and determines from the set of candidate moments
  • the target candidate moment includes: determining, by the first device, the target candidate moment from the set of candidate moments, wherein the target candidate moment is equal to or later than a moment when the CCA backoff procedure ends.
  • the target candidate moment is the moment in the candidate moment set that is later than the end of the CCA backoff process
  • the method further includes: the first device starts to send padding data in the channel from a time when the CCA backoff process ends; the first device stops in the channel from the target candidate moment The padding data is sent, wherein the target candidate moment is the first candidate moment in the set of candidate moments that is later than the end of the CCA backoff procedure.
  • the target candidate moment is the moment in the candidate moment set that is later than the end of the CCA backoff process
  • the method further includes: the first device starts CCA detection from a time when the CCA backoff process ends; the first device stops performing the CCA detection from the target candidate moment, wherein the target The alternate time is the first time that the channel in the set of candidate moments is later than the time at which the end of the CCA backoff procedure is idle.
  • the first device sends data in the channel according to the target candidate moment, including: the first device starts to idle from the target candidate moment The channel evaluates the CCA backoff procedure; the first device starts transmitting data in the channel from the time when the CCA backoff procedure ends.
  • the determining, by the first device, the candidate time set includes: the first device according to the channel The preset moment determines the set of alternative moments.
  • the preset time in the channel is any one of the following moments: a start time of the orthogonal frequency division multiplexing OFDM symbol in the channel, and corresponding to every 1/K orthogonal frequency division multiplexing symbols in the channel. Time, the start time of the time slot in the channel, the start time of the data subframe in the channel, the start time of the data frame in the channel, and the start time of the M sampling periods in the channel, where K is a positive integer greater than one, M is a positive integer.
  • an embodiment of the present invention provides a data transmission method, where a second device determines an alternate time set; the second device determines each candidate time in the candidate time set; and the second device is configured according to the The alternate moments receive data in the channel.
  • the second device receives data in the channel according to the each candidate moment, including: the second device at each candidate moment
  • the channel performs channel detection to receive data in the channel.
  • the second device receives data in the channel according to the each candidate moment, the second device, according to the each candidate moment, Determining an end time of each CCA detection for each of the idle channels; the second device performs channel detection on the channel at the end of each CCA detection to receive data in the channel.
  • the determining, by the second device, the set of candidate moments includes: The preset moment determines the set of alternative moments.
  • the preset time in the channel is any one of the following moments: orthogonal frequency division multiplexing in the channel The start time of the OFDM symbol, the time corresponding to every 1/K OFDM symbols in the channel, the start time of the time slot in the channel, the start time of the data subframe in the channel, the start time of the data frame in the channel, the channel The start time of M sampling periods, where K is a positive integer greater than 1, and M is a positive integer.
  • the embodiment of the present invention provides a first device, where the first device includes a first determining unit, a second determining unit, and a sending unit, where the first determining unit is configured to determine an alternate time set; the second a determining unit, configured to determine a target candidate moment from the set of candidate moments determined by the first determining unit, where the sending unit is configured to send data in the channel according to the target candidate moment determined by the second determining unit.
  • the second determining unit is configured to, according to the idle channel, estimate a time at which the CCA backoff process ends, from the candidate moment Determining the target candidate moment in the set; the sending unit is specifically configured to send data in the channel from the target candidate moment.
  • the second determining unit is specifically configured to determine the target candidate moment from the set of candidate moments, The target candidate moment is equal to or later than the end of the CCA backoff process.
  • the sending unit is further configured to use the target candidate moment in the set of candidate moments later than the second
  • the padding data is transmitted in the channel from the time when the CCA backoff process ends, and the padding data is stopped from being transmitted in the channel from the target candidate time, wherein
  • the target candidate moment is the first candidate moment in the set of candidate moments that is later than the end of the CCA backoff procedure.
  • the second determining unit is further configured to use the target candidate moment as the candidate in the candidate moment set
  • the CCA detection is started from the time when the CCA retreat process ends, and the CCA detection is stopped from the target candidate time, wherein the target candidate time is The first of the set of candidate moments that is later than the end of the CCA backoff procedure is an alternate moment of idle.
  • the second determining unit is configured to determine, according to the set of candidate moments, a first backoff threshold Nmin , where Nmin is a positive integer, An initial backoff value N is determined between [N min , q], where q is a preset backoff threshold of the first device, q is a positive integer greater than N min , and the CSA backoff process of the idle channel evaluation is performed according to the initial backoff value N, Determining a current backoff value N c , determining a second time, wherein the second time is a time when the current backoff value N c is equal to the first backoff threshold N min , and determining the target candidate time from the set of candidate moments, where The target candidate moment is not earlier than the second moment, and the target candidate moment is earlier than the third moment, wherein the third moment is a moment when the current backoff value N c is equal to 0; the sending unit is specifically used to The target starts to send data in the channel
  • the second determining unit is further configured to perform an idle channel estimation CCA backoff procedure from the target candidate moment; the sending unit is specifically configured to: Data is transmitted on the channel from the time when the CCA backoff process ends.
  • the first determining unit is specifically configured to determine the set of candidate moments according to a preset moment in the channel.
  • the embodiment of the present invention provides a second device, where the second device includes a first determining unit, a second determining unit, and a receiving unit, where the first determining unit is configured to determine an alternate time set; the second a determining unit, configured to determine each candidate moment in the set of candidate moments determined by the first determining unit, where the receiving unit is configured to receive in the channel according to the each candidate moment determined by the second determining unit data.
  • the receiving unit is configured to perform channel detection on the channel at each candidate moment to receive data in the channel.
  • the second determining unit is further configured to determine, according to the each candidate moment, an end time of the CCA detection for each idle channel; the receiving The unit is specifically configured to perform channel detection on the channel at the end of each CCA detection to receive data in the channel.
  • the first determining unit is configured to determine, according to a preset time in the channel, An alternate set of moments.
  • an embodiment of the present invention provides a first device, where the first device includes a processor and a transmitter, where the processor is configured to determine an alternate time set; the processor is further configured to determine from the processor The target candidate moment is determined in the set of candidate moments; the transmitter is configured to send data in the channel according to the target candidate moment determined by the processor.
  • the processor is configured to: determine, according to the idle channel, a time when the CCA backoff process ends, and determine the target candidate moment from the set of candidate moments.
  • the transmitter is specifically configured to send data in the channel from the target candidate moment.
  • the processor is configured to determine the target candidate moment from the set of candidate moments, where The target candidate moment is equal to or later than the end of the CCA backoff process.
  • the transmitter is further configured to use the target candidate moment in the set of candidate moments later than the second When the CCA backoff process ends at an alternate time, the CCA backoff process ends.
  • the target candidate moment is a moment in the set of candidate moments that is later than the end of the CCA backoff procedure The first alternate moment.
  • the processor is further configured to: after the target candidate moment, the candidate moment set is later than the When the CCA backoff process ends at an alternate time, the CCA detection is started from the time when the CCA backoff process ends, and the CCA detection is stopped from the target candidate time, wherein the target candidate time is the standby
  • the first one of the selected time sets that is later than the end of the CCA backoff process is an alternate time instant.
  • the processor is configured to determine, according to the set of candidate moments, a first backoff threshold Nmin , where Nmin is a positive integer, from [N The initial backoff value N is determined between min and q, where q is a preset backoff threshold of the first device, q is a positive integer greater than N min , and the idle channel assessment CCA backoff process is performed according to the initial backoff value N to determine the current Determining a value N c , determining a second time, wherein the second time is a time when the current backoff value N c is equal to the first backoff threshold N min , and determining the target candidate time from the set of candidate moments, wherein the target The candidate moment is not earlier than the second moment, and the target candidate moment is earlier than the third moment, wherein the third moment is a moment when the current backoff value N c is equal to 0; the transmitter is specifically used to Data is sent in the channel starting at an alternate time.
  • the processor is further configured to perform an idle channel assessment CCA backoff procedure from the target candidate moment; the transmitter is specifically configured to use the Data is transmitted on the channel from the time the CCA backoff process ends.
  • the processor is configured to determine the candidate according to a preset time in the channel. Time collection.
  • an embodiment of the present invention provides a second device, where the second device includes a processor and a receiver, where the processor is configured to determine an alternate time set; the processor is further configured to determine that the processor determines Each of the alternative moments in the set of candidate moments; the receiver for receiving data in the channel based on the each candidate moment determined by the processor.
  • the receiver is configured to perform channel detection on the channel at each candidate moment to receive data in the channel.
  • the processor is further configured to determine, according to the each candidate moment, an end time of the CCA detection for each idle channel; the receiver, Specifically, the channel is channel-detected at the end time of each CCA detection to receive data in the channel.
  • the processor is configured to determine the candidate according to a preset time in the channel. Time collection.
  • the moment when the first device sends data is determined according to the candidate moment in the set of candidate moments.
  • the corresponding second device receiving the data may also determine the time at which the data can be received according to the candidate moment in the set of candidate moments. That is to say, the second device can detect the channel only at the time when the system can transmit data, and does not need to continuously detect the channel at other times. Therefore, the above technical solution can reduce the power consumed by the second device when detecting the channel.
  • FIG. 1 is a schematic flowchart of a method for data transmission according to an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a method for data transmission according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a method of data transmission according to another embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a method for data transmission according to another embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a method of data transmission according to another embodiment of the present invention.
  • FIG. 8 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a method of data transmission according to another embodiment of the present invention.
  • FIG. 10 is a structural block diagram of a first device according to an embodiment of the present invention.
  • FIG. 11 is a structural block diagram of a second device according to an embodiment of the present invention.
  • FIG. 12 is a structural block diagram of a first device according to an embodiment of the present invention.
  • FIG. 13 is a structural block diagram of a second device according to an embodiment of the present invention.
  • the devices involved in the embodiments of the present invention are all devices in the LAA-LTE system. More specifically, the devices involved in the embodiments of the present invention are all devices operating in the LBE working mode.
  • the device involved in the embodiment of the present invention may be a user equipment or a network side device.
  • User equipment may also be referred to as a mobile terminal, such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal, for example, a portable, pocket, handheld, computer built-in or vehicle-mounted mobile device,
  • the network side device may be a base station or an access point (English: Access Poing, abbreviated as "AP”), and the present invention is not limited thereto.
  • AP Access Poing
  • first, second, and third in the first device, the second device, and the third device in the embodiment of the present invention are only for distinguishing devices, and are not limited to devices.
  • CCA Clear Channel Assessment
  • backoff English: backoff
  • the device will pass the CCA backoff before it occupies the channel resource to send data.
  • the device randomly selects an integer N from 1 to q as an initial backoff value, q may be referred to as a preset backoff threshold of the device, and q is a predetermined positive integer greater than 1; if the device performs CCA If it is determined that the channel resource is not occupied, the N is decremented by 1; if the device determines that the channel resource is occupied when the device performs CCA detection, the backoff value is kept unchanged, and the backoff value determined after each CCA detection may be referred to as current backoff.
  • the value N c The process by which the device decrements the initial backoff value based on the initial backoff value and the CCA detection may be referred to as CCA backoff.
  • the result of the CCA backoff refers to the current backoff value N c obtained after the device performs the CCA detection.
  • the result of the CCA backoff may be satisfied to satisfy the backoff condition. If the current backoff value N c determined by the device after performing the CCA detection is a positive integer greater than 0, the result of the CCA backoff may not be satisfied as the backoff condition.
  • the time at which the jth CCA detection ends is the end time of the CCA backoff process. It can be understood that j is a positive integer greater than or equal to N, that is, the device needs to perform at least N times of CCA detection.
  • the channel or channel resource referred to in the embodiment of the present invention may be a channel resource on an unlicensed spectrum, or may be a channel resource on a spectrum.
  • FIG. 1 is a schematic flowchart of a method for data transmission according to an embodiment of the present invention.
  • the method illustrated in Figure 1 is performed by a first device, which may be a device in a LAA-LTE system.
  • the first device determines an alternate time set.
  • the first device determines a target candidate moment from the set of candidate moments.
  • the first device sends data in a channel according to the target candidate moment.
  • the time at which the first device transmits data is determined according to an alternate moment in the set of alternative moments.
  • the corresponding second device receiving the data may also determine the time at which the data can be received according to the candidate moment in the set of candidate moments. That is to say, the second device can detect the channel only at the time when the system can transmit data, and does not need to continuously detect the channel at other times. Therefore, the method shown in FIG. 1 can reduce the power consumed by the second device when detecting a channel.
  • the first device may determine the set of candidate moments in a plurality of manners, which is not limited by the present invention.
  • the set of alternative moments may be pre-configured to be saved in the first device.
  • the set of candidate moments may also be pre-configured and saved in the first device.
  • the first device may send the set of alternative moments to other devices.
  • the set of alternative moments It can also be determined by the first device.
  • the first device may send the set of alternative moments to other devices.
  • the set of candidate moments may also be sent by the third device to the first device and the second device, where the second device is a device that receives the data sent by the first device.
  • the set of candidate moments is determined by the first device according to the feedback information sent by the second device, where the second device is a device that receives the data sent by the first device.
  • This set of alternative moments can be flexibly configured.
  • the set of alternative moments may be periodic or non-periodic.
  • the set of alternative moments may be embodied by a set of moments with a preset value, which may also be embodied by a formula.
  • the determining, by the first device, the target candidate moment from the set of candidate moments includes: determining, by the first device, the target from the set of candidate moments according to a moment when the CCA backoff procedure ends Alternative moment.
  • the first device sends data to the second device according to the target candidate moment, including: the first device starts to send data in the channel from the target candidate moment.
  • the determining, by the first device, the target candidate moment from the set of candidate moments according to the moment when the CCA backoff procedure ends the determining, by the first device, determining, by using the set of candidate moments The target candidate moment, wherein the target candidate moment is equal to or later than the end of the CCA backoff process.
  • the target candidate time may be equal to the time when the idle channel evaluation backoff process ends. In a case where the candidate time set does not include the time at which the idle channel evaluation backoff process ends, the target candidate time may be an alternate time in the candidate time set that is later than the end of the idle channel evaluation backoff process. .
  • the method further includes: the first device Transmitting padding data in the channel from the time when the idle channel evaluation backoff process ends; the first device stops transmitting the padding data in the channel from the target candidate moment, where the target device prepares The selected time is the first candidate moment in the set of candidate moments that is later than the end of the idle channel assessment backoff procedure.
  • the first device can be occupied by other devices by sending padding data to place channel resources.
  • the method further includes: A device starts CCA detection from a time when the CCA retreat process ends; the first device stops performing the CCA detection from the target candidate moment, wherein the target candidate moment is later than the CCA in the candidate moment set
  • the first of the channels at the end of the avoidance process is an alternate moment of idle.
  • the target alternate time is an alternate time after the time when the CCA backoff process ends, at which time the channel is idle.
  • the first device sends data according to the second candidate device in the channel according to the target candidate moment, where: the first device performs CCA backoff from the target candidate moment; the first device Data is transmitted on the channel from the time when the CCA backoff ends.
  • the determining, by the first device, the set of candidate moments includes: determining, by the first device, the set of candidate moments according to a preset moment in the channel.
  • the preset time in the channel is any one of the following moments: the start time of the Orthogonal Frequency Division Multiplexing ("OFDM") symbol in the channel, and every 1/K OFDM symbols in the channel. a corresponding time, a start time of a time slot in the channel, a start time of a data subframe in the channel, a start time of a data frame in the channel, and a start time of M sampling periods in the channel, where K is greater than 1 Integer, M is a positive integer.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the first candidate moment in the set of candidate moments is at the start time of the system frame number being the n data frame, where n is A positive integer or n can be equal to zero.
  • the other alternate moments in the set of alternative moments are the beginning of the M sampling periods on the channel, for example, M may be equal to 560 or 624.
  • K may take a value of 2 or 3. That is, every 1/2 point or every 1/3 point in the OFDM symbol on the channel acts as an alternate moment in the set of alternative moments.
  • the candidate moment in the set of candidate moments may also be multiple moments within the subframe of the channel.
  • the time at which the candidate moments within one subframe are located and the number of candidate moments within one subframe may be related to the sampling period.
  • an alternate moment of 30 576 sampling periods and an alternate moment of 24 560 sampling periods may be preset in one subframe.
  • the candidate moment of the 30 576 sampling periods means that a total of 30 candidate moments are set in the subframe, and the moment at which each candidate moment is is the starting moment of 576 sampling periods.
  • the candidate time of the 24 560 sampling periods means that a total of 24 candidate moments are set in the subframe, and the moment at which each candidate moment is is the start time of 560 sampling periods.
  • the 54 candidate moments in the subframe there may be a total of 54 candidate moments in the subframe, and 30 of the 54 candidate moments are at the beginning of 576 sampling periods, 24 of the 54 candidate moments.
  • the moment at which the alternate moment is located is the beginning of the 560 sampling period.
  • the order of the 54 alternate moments is not limited.
  • an alternate moment of 9 640 sampling periods and an alternative moment of 40 624 sampling periods may be preset in one subframe.
  • there are a total of 49 candidate moments in the subframe there are a total of 49 candidate moments in the subframe, and the moments of the 9 candidate moments of the 49 candidate moments are the start times of 640 sampling periods, and the 49 candidate moments
  • the 40 alternative moments are the beginning of 624 sample periods.
  • FIG. 2 is a schematic flowchart of a method for data transmission according to an embodiment of the present invention.
  • the method illustrated in Figure 2 is performed by a second device, which may be a device in a LAA-LTE system.
  • the second device determines an alternate time set.
  • the second device determines each candidate moment in the set of candidate moments.
  • the second moment receives data in the channel according to the each candidate moment.
  • the second device may determine the time at which the data can be received according to each candidate moment in the set of candidate moments. That is to say, the second device can detect the channel only at the time when the system can transmit data, and does not need to continuously detect the channel at other times. Therefore, the power consumed by the second device when detecting the channel is reduced.
  • the data received by the second device may be sent by the first device shown in FIG. 1.
  • the second device can obtain the set of candidate moments in a plurality of manners, which is not limited by the present invention.
  • the set of alternative moments may be pre-configured to be stored in the first device and the second device.
  • the set of alternative moments can also be pre-matched. Set it to be saved in the first device.
  • the second device may receive the set of candidate moments sent by the first device.
  • the set of alternative moments may also be determined by the first device.
  • the first device may send the transmission time sequence to the second device.
  • the second device can also determine feedback information indicating the set of alternative moments and send the feedback information to the first device that sent the data.
  • This set of alternative moments can be flexibly configured.
  • the set of alternative moments may be periodic or non-periodic.
  • the set of alternative moments may be embodied by a set of pre-set moments, which may also be embodied by a formula, which is not limited by the invention.
  • the second device receives data in the channel according to the each candidate moment, including: the second device performs channel detection on the channel at each candidate moment, so that the channel is in the channel. Receive data in.
  • the second device receives data in the channel according to the each candidate moment, where: the second device determines, according to the each candidate moment, an end time of each CCA detection; The second device performs channel detection on the channel at the end of each CCA detection to receive data in the channel.
  • the determining, by the second device, the set of candidate moments includes: determining, by the second device, the set of candidate moments according to a preset moment in the channel.
  • the determining, by the second device, the set of candidate moments includes: determining, by the first device, the set of candidate moments according to a preset moment in the channel.
  • the preset time in the channel is any one of the following moments: the start time of the Orthogonal Frequency Division Multiplexing ("OFDM") symbol in the channel, and every 1/K OFDM symbols in the channel. a corresponding time, a start time of a time slot in the channel, a start time of a data subframe in the channel, a start time of a data frame in the channel, and a start time of M sampling periods in the channel, where K is greater than 1 Integer, M is a positive integer.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the first candidate moment in the set of candidate moments is at the start time of the system frame number being the n data frame, where n is A positive integer or n can be equal to zero.
  • the other candidate moments in the set of alternative moments are the starting moments of the M sampling periods in the channel, for example, M may be equal to 560 or 624.
  • K may take a value of 2 or 3. That is, every 1/2 point in the OFDM symbol in the channel Or every 1/3 point is used as an alternative moment in the set of alternative moments.
  • the candidate moment in the set of candidate moments may also be multiple moments within the subframe of the channel.
  • the time at which the candidate moments within one subframe are located and the number of candidate moments within one subframe may be related to the sampling period.
  • an alternate moment of 30 576 sampling periods and an alternate moment of 24 560 sampling periods may be preset in one subframe.
  • the candidate moment of the 30 576 sampling periods means that a total of 30 candidate moments are set in the subframe, and the moment at which each candidate moment is is the starting moment of 576 sampling periods.
  • the candidate time of the 24 560 sampling periods means that a total of 24 candidate moments are set in the subframe, and the moment at which each candidate moment is is the start time of 560 sampling periods.
  • the 54 candidate moments in the subframe there may be a total of 54 candidate moments in the subframe, and 30 of the 54 candidate moments are at the beginning of 576 sampling periods, 24 of the 54 candidate moments.
  • the moment at which the alternate moment is located is the beginning of the 560 sampling period.
  • the order of the 54 alternate moments is not limited.
  • an alternate moment of 9 640 sampling periods and an alternative moment of 40 624 sampling periods may be preset in one subframe.
  • there are a total of 49 candidate moments in the subframe there are a total of 49 candidate moments in the subframe, and the moments of the 9 candidate moments of the 49 candidate moments are the start times of 640 sampling periods, and the 49 candidate moments
  • the 40 alternative moments are the beginning of 624 sample periods.
  • FIG. 3 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.
  • the first device performs CCA backoff and determines a time when the CCA backoff process ends, where the time when the CCA backoff process ends is a time when the result of the CCA backoff meets the backoff condition.
  • the first device performs CCA backoff, including: determining, by the first device, that the channel is occupied according to the CCA; the first device determining an initial backoff value; the first device determining a result of the CCA backoff and determining whether the result is based on the result of the CCA backoff The back-off condition is satisfied; the first device completes the CCA back-off if it is determined that the back-off condition is satisfied according to the result of the CCA back-off; and the first device continues the CCA back-off if it determines that the back-off condition is not satisfied according to the result of the CCA back-off .
  • the first device determines, from the set of candidate moments, whether the time is the same as the time when the CCA backoff procedure ends.
  • the first device may determine the CCA backoff procedure
  • the moment of the bundle is the target candidate moment. If the first device determines that the same time instant as the end of the CCA backoff procedure does not exist in the set of candidate moments, the first device may be from a moment in the set of candidate moments that is later than the end of the CCA backoff procedure
  • the target candidate moment is selected in the alternate moment, wherein the target candidate moment may be an alternate moment later than the end of the CCA backoff process.
  • the method further includes step 303 and step 304.
  • the first device starts to use the channel to send padding data from the time when the CCA backoff process ends.
  • the first device stops sending the padding data from the target candidate moment, where the target candidate moment is the first candidate moment in the candidate moment set that is later than the end of the CCA backoff procedure.
  • the first device occupies the channel by sending padding data from the time when the CCA backoff process ends, so the first device may determine that the target candidate time is later than the time at which the idle channel evaluation backoff process ends. An alternate moment.
  • the first device may occupy the channel to prevent other devices from preempting the channel.
  • the method may further include steps 305 and 306.
  • the first device starts CCA detection from a time when the CCA retreat process ends.
  • the first device stops performing CCA detection from the target candidate moment, where the target candidate moment is an candidate for the first channel that is idle later than the end of the CCA backoff procedure in the candidate moment set. time.
  • Steps 305 and 306 may be considered to be that after the current backoff value is equal to 0, the first device continues CCA detection until an alternate moment when the channel is idle later than the end of the CCA backoff procedure. That is, if the first device determines that the channel is occupied at a first candidate moment after the end of the CCA backoff procedure, the first device continues to perform CCA detection until a time later than the end of the CCA backoff procedure. The first alternative moment when the channel is idle.
  • the first device starts to send data to the second device in the channel from the target candidate moment.
  • the second device determines each candidate moment in the set of candidate moments.
  • the second device performs channel detection on the channel at each candidate moment to receive data in the channel.
  • step 308 and step 309 can be performed before or after any of steps 301 to 307.
  • the moment when the first device transmits data is an alternate moment in the preset set of alternative moments.
  • the second device also begins channel detection to receive data only at alternative moments in the set of alternate moments. In this way, the second device can accurately receive the data sent by the first device without continuously detecting the channel. In this case, the power consumed by the second device on the received data is greatly reduced.
  • FIG. 4 is a schematic diagram of a method of data transmission according to another embodiment of the present invention. Specifically, the timing chart shown in FIG. 4 is a schematic diagram of one embodiment of a method of data transmission according to FIG.
  • the times t1, t2, t5, and t6 shown in FIG. 4 are respectively four consecutive alternative moments in the set of alternative moments.
  • the four moments t1, t2, t5, and t6 are the moments at which data may be transmitted. Therefore, the second device can perform channel detection at these four times in preparation for receiving data.
  • the first device performs CCA backoff from time t3.
  • Time t4 is a time at which the result of the CCA retreat of the first device satisfies the retreat condition.
  • Time t4 is not an alternate time.
  • the first device transmits the padding data using the channel from time t4.
  • Time t5 is an alternate time in the set of alternative time instants. Therefore, starting from time t5, the first device stops transmitting padding data and starts transmitting data in the channel.
  • FIG. 5 is a schematic diagram of a method for data transmission according to another embodiment of the present invention. Specifically, the timing chart shown in FIG. 5 is a schematic diagram of another embodiment of the method of data transmission according to FIG.
  • the times t1, t2, t5, and t6 shown in FIG. 5 are respectively four consecutive candidate moments in the set of alternative moments.
  • the four moments t1, t2, t5, and t6 are the moments at which data may be transmitted. Therefore, the second device can perform channel detection at these four times in preparation for receiving data.
  • the first device performs CCA backoff from time t3.
  • Time t4 is a time at which the result of the CCA retreat of the first device satisfies the retreat condition. Time t4 is not an alternate time. In this case, the first device performs CCA detection from time t4.
  • the first device can transmit data using the channel from time t5. Understandably, The CCA detection shown in FIG. 5 refers to all CCA detections from time t4 to time t5.
  • FIG. 6 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.
  • the first device determines, according to the set of candidate moments, a first backoff threshold Nmin , where Nmin is a positive integer.
  • the first device may determine that a first threshold value N min backoff by the following equation:
  • ⁇ t represents this alternative means set the maximum time interval between two alternative time, ⁇ represents a long CCA CCA detect slot.
  • the first device determines from between [N min, q] initial backoff value N, where q is the predetermined first threshold backoff devices, q is a positive integer greater than N min.
  • the first device performs a CCA backoff procedure according to the initial backoff value N.
  • the first device determines a target candidate moment from the set of candidate moments when retracting to a range of [0, N min ].
  • the first device may determine a second moment, where the second moment is a moment when the current backoff value N c is equal to the first backoff threshold N min .
  • the first device may determine, from the set of candidate moments, no earlier than the second moment and the first candidate moment of the set of candidate moments after the second moment as the target candidate moment.
  • the channel is idle.
  • the first device can determine the target candidate time from the set of candidate moments.
  • the target candidate moment is earlier than the third moment, and the third moment is the moment when the current backoff value N c is equal to 0.
  • the first device starts sending data to the second device in the channel from the determined target candidate moment.
  • the second device determines each candidate moment in the set of candidate moments.
  • the second device performs channel detection on the channel at each candidate moment to receive data in the channel.
  • step 606 and step 607 can be performed before or after any of steps 601 to 605.
  • the moment when the first device sends data is a preset set of candidate moments. Alternative moments in .
  • the second device also begins channel detection to receive data only at alternative moments in the set of alternate moments. In this way, the second device can accurately receive the data sent by the first device without continuously detecting the channel. In this case, the power consumed by the second device on the received data is greatly reduced.
  • FIG. 7 is a schematic diagram of a method of data transmission according to another embodiment of the present invention. Specifically, the timing chart shown in FIG. 7 is a schematic diagram of a method of data transmission according to FIG. 6.
  • the times t1, t3 and t5 shown in Fig. 7 are three consecutive alternative moments in the set of alternative moments. In other words, the three times t1, t3, and t5 are the moments when data may be transmitted. Therefore, the second device can perform channel detection at these three times in preparation for receiving data.
  • Time t2 is the time at which the first device starts CCA retraction.
  • the current backoff value N c of the first device is equal to the initial backoff value N.
  • Time t4 is the time at which the current backoff value N c is equal to N min . If the first device continues the CCA backoff until the current backoff value N c is equal to 0, the time when the current backoff value is equal to 0 is the time t6. It can be seen that the first device can start transmitting data using the channel from the first alternative time after time t4. At the same time, the first device does not wait until the result of the CCA backoff is that N c is equal to 0 to start transmitting data.
  • FIG. 8 is a schematic flowchart of a method for data transmission according to another embodiment of the present invention.
  • the first device determines a target candidate moment from the set of candidate moments.
  • the first device performs CCA backoff from the target candidate moment.
  • the first device starts to send data to the second device in the channel from a time when the result of the CCA backoff meets the backoff condition.
  • the second device determines each candidate moment in the set of candidate moments.
  • the second device determines an end time of each CCA detection according to each candidate moment.
  • the second device may determine the end time of each CCA detection according to the each candidate moment.
  • the second device performs channel detection on the channel at the end of the CCA detection to receive data in the channel.
  • the timing at which the CCA backoff is started is determined based on the preset set of candidate times, and the duration of each CCA detection is determined. Therefore, the end time of each CCA detection is also determined.
  • the starting time at which the first device transmits data is the end time of the CCA detection. Therefore, the second device can start listening to the channel from the end of each CCA detection. Resources. In this way, the second device does not need to continuously perform channel detection during the CCA detection process, which reduces the power consumption of the second device.
  • FIG. 9 is a schematic diagram of a method of data transmission according to another embodiment of the present invention. Specifically, the timing chart shown in FIG. 9 is a schematic diagram of a method of data transmission according to FIG.
  • the times t1, t3, and t5 shown in Fig. 9 are three consecutive alternative moments in the set of alternative moments.
  • the second device may determine an end time of each CCA detection according to each candidate time, and perform channel detection at the end time of each CCA detection to receive data.
  • the channel resources are occupied.
  • the channel resources are idle.
  • the first device performs CCA backoff from the first candidate time after time t2 (ie, time t3).
  • time t4 the result of the CCA backoff satisfies the backoff condition.
  • the first device transmits data starting at time t4.
  • FIG. 10 is a structural block diagram of a first device according to an embodiment of the present invention. As shown in FIG. 10, the first device 1000 includes a first determining unit 1001, a second determining unit 1002, and a transmitting unit 1003.
  • the first determining unit 1001 is configured to determine an alternate time set.
  • the second determining unit 1002 is configured to determine a target candidate moment from the set of candidate moments determined by the first determining unit 1001.
  • the sending unit 1003 is configured to send data in the channel according to the target candidate moment determined by the second determining unit 1002.
  • the timing at which the first device 1000 shown in FIG. 10 transmits data is determined according to an alternate moment in the set of candidate moments.
  • the corresponding device receiving the data may also determine the time at which the data can be received according to the candidate moment in the set of alternative moments. That is to say, the device receiving the data can detect the channel only at the time when the system can transmit data, and does not need to continuously detect the channel at other times.
  • the first device 1000 can reduce the power consumed by the device receiving the data when detecting the channel.
  • the second determining unit 1002 is specifically configured to determine, according to the idle channel, a time when the CCA backoff process ends, and determine the target candidate moment from the set of candidate moments.
  • the sending unit 1003 is specifically configured to send data in the channel from the target candidate moment.
  • the second determining unit 1002 is specifically configured to determine the target candidate moment from the set of candidate moments, where the target candidate moment is equal to or later than the end of the CCA backoff procedure.
  • the sending unit 1003 is further configured to: when the target candidate time is an candidate time in the candidate time set that is later than the time when the CCA backoff process ends, start from the time when the CCA backoff process ends The padding data is sent in the channel, and stops at the target candidate moment. The padding data is sent in the channel, where the target candidate moment is the first candidate moment in the set of candidate moments that is later than the end of the CCA backoff procedure.
  • the second determining unit 1002 is further configured to: when the target candidate moment is an candidate moment in the candidate time set that is later than the time when the CCA backoff process ends, from the time when the CCA backoff process ends Starting CCA detection, stopping the CCA detection from the target candidate moment, wherein the target candidate moment is the first one of the candidate time sets that is later than the end of the CCA backoff process is idle Alternative moment.
  • the second determining unit 1002 is specifically configured to determine, according to the candidate time set, a first backoff threshold N min , where N min is a positive integer, and is determined from [N min , q] An initial backoff value N, where q is a preset backoff threshold of the first device, q is a positive integer greater than N min , and the idle channel assessment CCA backoff procedure is performed according to the initial backoff value N, and the current backoff value N c is determined, and the determination is performed.
  • the sending unit 1003 is specifically configured to send data in the channel from the target candidate moment.
  • the second determining unit 1002 is further configured to perform an idle channel assessment CCA backoff procedure from the target candidate moment.
  • the sending unit 1003 is specifically configured to start transmitting data in the channel from the time when the CCA backoff process ends.
  • the first determining unit 1001 is specifically configured to determine the candidate time set according to a preset time in the channel.
  • the preset time in the channel is any one of the following moments: the start time of the Orthogonal Frequency Division Multiplexing ("OFDM") symbol in the channel, and every 1/K OFDM symbols in the channel. a corresponding time, a start time of a time slot in the channel, a start time of a data subframe in the channel, a start time of a data frame in the channel, and a start time of M sampling periods in the channel, where K is greater than 1 Integer, M is a positive integer.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the first candidate moment in the set of candidate moments is at the start time of the system frame number being the n data frame, where n is A positive integer or n can be equal to zero.
  • the other candidate moments in the set of alternative moments are the starting moments of the M sampling periods in the channel, for example, M may be equal to 560 or 624.
  • K can take a value of 2 or 3. That is, every 1/2 point or every 1/3 point in the OFDM symbol in the channel is used as an alternate moment in the set of alternative moments.
  • the candidate moment in the set of candidate moments may also be multiple moments within the subframe of the channel.
  • the time at which the candidate moments within one subframe are located and the number of candidate moments within one subframe may be related to the sampling period.
  • an alternate moment of 30 576 sampling periods and an alternate moment of 24 560 sampling periods may be preset in one subframe.
  • the candidate moment of the 30 576 sampling periods means that a total of 30 candidate moments are set in the subframe, and the moment at which each candidate moment is is the starting moment of 576 sampling periods.
  • the candidate time of the 24 560 sampling periods means that a total of 24 candidate moments are set in the subframe, and the moment at which each candidate moment is is the start time of 560 sampling periods.
  • the 54 candidate moments in the subframe there may be a total of 54 candidate moments in the subframe, and 30 of the 54 candidate moments are at the beginning of 576 sampling periods, 24 of the 54 candidate moments.
  • the moment at which the alternate moment is located is the beginning of the 560 sampling period.
  • the order of the 54 alternate moments is not limited.
  • an alternate moment of 9 640 sampling periods and an alternative moment of 40 624 sampling periods may be preset in one subframe.
  • there are a total of 49 candidate moments in the subframe there are a total of 49 candidate moments in the subframe, and the moments of the 9 candidate moments of the 49 candidate moments are the start times of 640 sampling periods, and the 49 candidate moments
  • the 40 alternative moments are the beginning of 624 sample periods.
  • FIG. 11 is a structural block diagram of a second device according to an embodiment of the present invention.
  • the second device 1100 shown in FIG. 11 includes a first determining unit 1101, a second determining unit 1102, and a receiving unit 1103.
  • the first determining unit 1101 is configured to determine an alternate time set.
  • the second determining unit 1102 is configured to determine each candidate moment in the set of candidate moments determined by the first determining unit 1101.
  • the receiving unit 1103 is configured to receive data in the channel according to the each candidate moment determined by the second determining unit 1102.
  • the second device 1100 shown in FIG. 11 can determine the time at which the data can be received according to each candidate moment in the set of candidate moments. That is to say, the second device 1100 can detect the channel only at a time specified by the system capable of transmitting data, and does not need to continuously detect the channel at other times. Therefore, the power consumed by the second device 1100 when detecting the channel is reduced.
  • the receiving unit 1103 is specifically configured to perform channel detection on the channel at each candidate moment to receive data in the channel.
  • the second determining unit 1102 is further configured to perform, according to each At the time of selection, it is determined that each idle channel evaluates the end time of the CCA detection.
  • the receiving unit 1103 is specifically configured to perform channel detection on the channel at the end time of each CCA detection to receive data in the channel.
  • the first determining unit 1101 is specifically configured to determine the candidate time set according to a preset time in the channel.
  • the preset time in the channel is any one of the following moments: the start time of the Orthogonal Frequency Division Multiplexing ("OFDM") symbol in the channel, and every 1/K OFDM symbols in the channel. a corresponding time, a start time of a time slot in the channel, a start time of a data subframe in the channel, a start time of a data frame in the channel, and a start time of M sampling periods in the channel, where K is greater than 1 Integer, M is a positive integer.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the first candidate moment in the set of candidate moments is at the start time of the system frame number being the n data frame, where n is A positive integer or n can be equal to zero.
  • the other candidate moments in the set of alternative moments are the starting moments of the M sampling periods in the channel, for example, M may be equal to 560 or 624.
  • K may take a value of 2 or 3. That is, every 1/2 point or every 1/3 point in the OFDM symbol in the channel is used as an alternate moment in the set of alternative moments.
  • the candidate moment in the set of candidate moments may also be multiple moments within the subframe of the channel.
  • the time at which the candidate moments within one subframe are located and the number of candidate moments within one subframe may be related to the sampling period.
  • an alternate moment of 30 576 sampling periods and an alternate moment of 24 560 sampling periods may be preset in one subframe.
  • the candidate moment of the 30 576 sampling periods means that a total of 30 candidate moments are set in the subframe, and the moment at which each candidate moment is is the starting moment of 576 sampling periods.
  • the candidate time of the 24 560 sampling periods means that a total of 24 candidate moments are set in the subframe, and the moment at which each candidate moment is is the start time of 560 sampling periods.
  • the 54 candidate moments in the subframe there may be a total of 54 candidate moments in the subframe, and 30 of the 54 candidate moments are at the beginning of 576 sampling periods, 24 of the 54 candidate moments.
  • the moment at which the alternate moment is located is the beginning of the 560 sampling period.
  • the order of the 54 alternate moments is not limited.
  • an alternate moment of 9 640 sampling periods and an alternative moment of 40 624 sampling periods may be preset in one subframe.
  • there are a total of 49 candidate moments in the subframe and the moments of the 9 candidate moments of the 49 candidate moments are the start times of 640 sampling periods, and the 49 candidate moments 40 alternatives
  • the time is the beginning of 624 sample periods.
  • FIG. 12 is a structural block diagram of a first device according to an embodiment of the present invention. As shown in FIG. 12, the first device 1200 processor 1201 and the transmitter 1202,
  • the processor 1201 is configured to determine an alternate time set.
  • the processor 1201 is further configured to determine a target candidate moment from the set of candidate moments determined by the processor 1201.
  • the transmitter 1202 is configured to send data in the channel according to the target candidate moment determined by the processor 1201.
  • the timing at which the first device 1200 shown in FIG. 12 transmits data is determined according to an alternate moment in the set of candidate moments.
  • the corresponding device receiving the data may also determine the time at which the data can be received according to the candidate moment in the set of alternative moments. That is to say, the device receiving the data can detect the channel only at the time when the system can transmit data, and does not need to continuously detect the channel at other times.
  • the first device 1200 can reduce the power consumed by the device receiving the data when detecting the channel.
  • the processor 1201 is specifically configured to determine, according to the idle channel, a time when the CCA backoff process ends, and determine the target candidate moment from the set of candidate moments.
  • the transmitter 1202 is specifically configured to send data in the channel from the target candidate moment.
  • the processor 1201 is specifically configured to determine the target candidate moment from the set of candidate moments, where the target candidate moment is equal to or later than the end of the CCA backoff procedure.
  • the transmitter 1202 is further configured to: when the target candidate moment is an candidate moment in the candidate moment set that is later than the end of the CCA backoff process, start from the time when the CCA backoff process ends The padding data is sent in the channel, and the padding data is stopped from being sent in the channel from the target candidate moment, where the target candidate moment is the first one of the candidate moments set that is later than the end of the CCA backoff procedure.
  • the target candidate moment is the first one of the candidate moments set that is later than the end of the CCA backoff procedure.
  • the processor 1201 is further configured to start from a time when the CCA backoff process ends when the target candidate time is an candidate time in the set of candidate times that is later than the time when the CCA backoff process ends.
  • the CCA detects that the CCA detection is stopped from the target candidate moment, wherein the target candidate moment is the first candidate in the candidate set of times that is later than the end of the CCA backoff procedure is idle. time.
  • the processor 1201 is specifically configured to determine, according to the set of candidate moments, a first backoff threshold N min , where N min is a positive integer, and an initial backoff is determined from [N min , q] The value N, where q is the preset backoff threshold of the first device, and q is a positive integer greater than N min .
  • the idle channel estimation CCA backoff process is performed according to the initial backoff value N, the current backoff value N c is determined, and the second moment is determined.
  • the transmitter 1202 is specifically configured to send data in the channel from the target candidate moment.
  • the processor 1201 is further configured to perform an idle channel assessment CCA backoff procedure from the target candidate moment.
  • the transmitter 1202 is specifically configured to start transmitting data in the channel from the time when the CCA backoff process ends.
  • the processor 1201 is specifically configured to determine the candidate time set according to a preset time in the channel.
  • the preset time in the channel is any one of the following moments: the start time of the Orthogonal Frequency Division Multiplexing ("OFDM") symbol in the channel, and every 1/K OFDM symbols in the channel. a corresponding time, a start time of a time slot in the channel, a start time of a data subframe in the channel, a start time of a data frame in the channel, and a start time of M sampling periods in the channel, where K is greater than 1 Integer, M is a positive integer.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the first candidate moment in the set of candidate moments is at the start time of the system frame number being the n data frame, where n is A positive integer or n can be equal to zero.
  • the other candidate moments in the set of alternative moments are the starting moments of the M sampling periods in the channel, for example, M may be equal to 560 or 624.
  • K may take a value of 2 or 3. That is, every 1/2 point or every 1/3 point in the OFDM symbol in the channel is used as an alternate moment in the set of alternative moments.
  • the candidate moment in the set of candidate moments may also be multiple moments within the subframe of the channel.
  • the time at which the candidate moments within one subframe are located and the number of candidate moments within one subframe may be related to the sampling period.
  • an alternate moment of 30 576 sampling periods and an alternate moment of 24 560 sampling periods may be preset in one subframe.
  • the candidate moment of the 30 576 sampling periods means that a total of 30 candidate moments are set in the subframe, and the moment at which each candidate moment is is the starting moment of 576 sampling periods.
  • the alternate time of the 24 560 sampling periods means that a total of 24 candidate moments are set in the subframe, and the moment of each candidate moment is The beginning of 560 sampling periods.
  • the 54 candidate moments in the subframe there may be a total of 54 candidate moments in the subframe, and 30 of the 54 candidate moments are at the beginning of 576 sampling periods, 24 of the 54 candidate moments.
  • the moment at which the alternate moment is located is the beginning of the 560 sampling period.
  • the order of the 54 alternate moments is not limited.
  • an alternate moment of 9 640 sampling periods and an alternative moment of 40 624 sampling periods may be preset in one subframe.
  • there are a total of 49 candidate moments in the subframe there are a total of 49 candidate moments in the subframe, and the moments of the 9 candidate moments of the 49 candidate moments are the start times of 640 sampling periods, and the 49 candidate moments
  • the 40 alternative moments are the beginning of 624 sample periods.
  • FIG. 13 is a structural block diagram of a second device according to an embodiment of the present invention. As shown in FIG. 13, the second device 1300 includes a processor 1301 and a receiver 1302.
  • the processor 1301 is configured to determine an alternate time set.
  • the processor 1301 is further configured to determine each of the candidate moments determined by the processor 1301.
  • the receiver 1302 is configured to receive data in the channel according to the each candidate moment determined by the processor 1301.
  • the second device 1300 shown in FIG. 13 can determine the time at which the data can be received according to each candidate moment in the set of candidate moments. That is to say, the second device 1300 can detect the channel only at a time specified by the system capable of transmitting data, and does not need to continuously detect the channel at other times. Therefore, the power consumed by the second device 1300 when detecting the channel is reduced.
  • the receiver 1302 is configured to perform channel detection on the channel at each candidate moment to receive data in the channel.
  • the processor 1301 is further configured to determine, according to the each candidate moment, an end time of each of the idle channel assessment CCA detections.
  • the receiver 1302 is specifically configured to perform channel detection on the channel at the end time of each CCA detection to receive data in the channel.
  • the processor 1301 is specifically configured to determine the candidate time set according to a preset time in the channel.
  • the preset time in the channel is any one of the following moments: the start time of the Orthogonal Frequency Division Multiplexing ("OFDM") symbol in the channel, and every 1/K OFDM symbols in the channel.
  • OFDM Orthogonal Frequency Division Multiplexing
  • start time of the time slot in the channel start time of the data sub-frame in the channel, start time of the data frame in the channel, M in the channel.
  • the first candidate moment in the set of candidate moments is at the start time of the system frame number being the n data frame, where n is A positive integer or n can be equal to zero.
  • the other candidate moments in the set of alternative moments are the starting moments of the M sampling periods in the channel, for example, M may be equal to 560 or 624.
  • K may take a value of 2 or 3. That is, every 1/2 point or every 1/3 point in the OFDM symbol in the channel is used as an alternate moment in the set of alternative moments.
  • the candidate moment in the set of candidate moments may also be multiple moments within the subframe of the channel.
  • the time at which the candidate moments within one subframe are located and the number of candidate moments within one subframe may be related to the sampling period.
  • an alternate moment of 30 576 sampling periods and an alternate moment of 24 560 sampling periods may be preset in one subframe.
  • the candidate moment of the 30 576 sampling periods means that a total of 30 candidate moments are set in the subframe, and the moment at which each candidate moment is is the starting moment of 576 sampling periods.
  • the candidate time of the 24 560 sampling periods means that a total of 24 candidate moments are set in the subframe, and the moment at which each candidate moment is is the start time of 560 sampling periods.
  • the 54 candidate moments in the subframe there may be a total of 54 candidate moments in the subframe, and 30 of the 54 candidate moments are at the beginning of 576 sampling periods, 24 of the 54 candidate moments.
  • the moment at which the alternate moment is located is the beginning of the 560 sampling period.
  • the order of the 54 alternate moments is not limited.
  • an alternate moment of 9 640 sampling periods and an alternative moment of 40 624 sampling periods may be preset in one subframe.
  • there are a total of 49 candidate moments in the subframe there are a total of 49 candidate moments in the subframe, and the moments of the 9 candidate moments of the 49 candidate moments are the start times of 640 sampling periods, and the 49 candidate moments
  • the 40 alternative moments are the beginning of 624 sample periods.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本发明实施例提供数据传输的方法和设备，该方法包括：第一设备确定备选时刻集合；该第一设备从该备选时刻集合中确定目标备选时刻；该第一设备根据该目标备选时刻在信道中发送数据。上述技术方案中，第一设备发送数据的时刻是根据备选时刻集合中的备选时刻确定的。在此情况下，对应的接收该数据的第二设备也可以根据该备选时刻集合中的备选时刻确定能够接收该数据的时刻。也就是说，第二设备可以仅在系统规定的能够发送数据的时刻对信道进行检测，而在其他时刻无需对信道进行持续检测。因此，上述技术方案能够降低第二设备在检测信道时消耗的功率。

Description

数据传输的方法和设备 技术领域
本发明实施例涉及通信技术领域，并且更具体地，涉及数据传输的方法和设备。
背景技术
长期演进的授权频谱辅助接入(英文：Licensed-Assisted Access Using Long Term Evolution，简称：“LAA-LTE”)系统中的设备通过说前先听原则(英文：Listen Before Talk，简称“LBT”)使用信道资源。LBT的工作方式分为基于负载(英文：Load Based Equipment，简称“LBE”)的工作方式和基于帧(Frame Based Equipment，简称“FBE”)的工作方式。
在LAA-LTE系统中进行数据传输时，接收端设备需要持续检测信道才能够获取数据，这就使得接收端设备功率消耗比较大。
发明内容
本发明实施例提供数据传输的方法和设备，能够降低设备在接收数据时消耗的功率。
第一方面，本发明实施例提供一种数据传输的方法，第一设备确定备选时刻集合；该第一设备从该备选时刻集合中确定目标备选时刻；该第一设备根据该目标备选时刻在信道中发送数据。
结合第一方面，在第一种可能的实现方式中，该第一设备从该备选时刻集合中确定目标备选时刻，包括：该第一设备根据空闲信道评估CCA退避过程结束的时刻，从该备选时刻集合中确定该目标备选时刻；该第一设备根据该目标备选时刻在信道中发送数据，包括：该第一设备从该目标备选时刻起开始在该信道中发送数据。
结合第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，该第一设备根据空闲信道评估CCA退避过程结束的时刻，从该备选时刻集合中确定该目标备选时刻，包括：该第一设备从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻等于或晚于该CCA退避过程结束的时刻。
结合第一方面的第二种可能的实现方式，在第一方面的第三种可能的实现方式中，在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，该方法还包括：该第一设备从该CCA退避过程结束的时刻起开始在该信道中发送填充数据；该第一设备从该目标备选时刻起停止在该信道中发送该填充数据，其中该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的第一个备选时刻。
结合第一方面的第二种可能的实现方式，在第一方面的第四种可能的实现方式中，在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，该方法还包括：该第一设备从该CCA退避过程结束的时刻起开始进行CCA检测；该第一设备从该目标备选时刻起停止进行该CCA检测，其中该目标备选时刻为该备选时刻集合中的晚于该CCA退避过程结束的时刻的第一个该信道是空闲的备选时刻。
结合第一方面，在第一方面的第五种可能的实现方式中，该第一设备从该备选时刻集合中确定目标备选时刻，包括：该第一设备根据该备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数；该第一设备从[Nmin,q]之间确定初始退避值N，其中q为该第一设备的预设退避阈值，q为大于Nmin的正整数；该第一设备根据该初始退避值N进行空闲信道评估CCA退避过程；该第一设备确定当前退避值Nc；该第一设备确定第二时刻，其中该第二时刻为该当前退避值Nc等于该第一退避阈值Nmin的时刻；该第一设备从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻不早于该第二时刻，且该目标备选时刻早于第三时刻，其中该第三时刻为该当前退避值Nc等于0的时刻；该第一设备根据该目标备选时刻在信道中发送数据，包括：该第一设备从该目标备选时刻起开始在该信道中发送数据。
结合第一方面，在第一方面的第六种可能的实现方式中，该第一设备根据该目标备选时刻在信道中发送数据，包括：该第一设备从该目标备选时刻开始进行空闲信道评估CCA退避过程；该第一设备从该CCA退避过程结束的时刻起开始在该信道中发送数据。
结合第一方面或第一方面的上述任一种可能的实现方式，在第一方面的第七种可能的实现方式中，该第一设备确定备选时刻集合包括：该第一设备根据信道中的预设时刻确定该备选时刻集合。
结合第一方面的第七种可能的实现方式，在第一方面的第八种可能的实 现方式中，该信道中的预设时刻为以下任一种时刻：该信道中正交频分复用OFDM符号的开始时刻、该信道中每1/K个正交频分复用符号对应的时刻、该信道中时隙的开始时刻、该信道中数据子帧的开始时刻、该信道中数据帧的开始时刻、该信道中M个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
第二方面，本发明实施例提供一种数据传输的方法，第二设备确定备选时刻集合；该第二设备确定该备选时刻集合中的每个备选时刻；该第二设备根据该每个备选时刻在信道中接收数据。
结合第二方面，在第二方面的第一种可能的实现方式中，该第二设备根据该每个备选时刻在信道中接收数据，包括：该第二设备在该每个备选时刻对该信道进行信道检测，以便在该信道中接收数据。
结合第二方面，在第二方面的第二种可能的实现方式中，该第二设备根据该每个备选时刻在信道中接收数据，包括：该第二设备根据该每个备选时刻，确定每个空闲信道评估CCA检测的结束时刻；该第二设备在该每个CCA检测的结束时刻对该信道进行信道检测，以便在该信道中接收数据。
结合第二方面或第二方面的上述任一种可能的实现方式，在第二方面的第三种可能的实现方式中，该第二设备确定备选时刻集合包括：该第二设备根据信道中的预设时刻确定该备选时刻集合。
结合第二方面的第三种可能的实现方式，在第二方面的第四种可能的实现方式中，该信道中的预设时刻为以下任一种时刻：该信道中正交频分复用OFDM符号的开始时刻、该信道中每1/K个OFDM符号对应的时刻、该信道中时隙的开始时刻、该信道中数据子帧的开始时刻、该信道中数据帧的开始时刻、该信道中M个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
第三方面，本发明实施例提供一种第一设备，该第一设备包括第一确定单元、第二确定单元和发送单元，该第一确定单元，用于确定备选时刻集合；该第二确定单元，用于从该第一确定单元确定的该备选时刻集合中确定目标备选时刻；该发送单元，用于根据该第二确定单元确定的该目标备选时刻在信道中发送数据。
结合第三方面，在第三方面的第一种可能的实现方式中，该第二确定单元，具体用于根据空闲信道评估CCA退避过程结束的时刻，从该备选时刻 集合中确定该目标备选时刻；该发送单元，具体用于从该目标备选时刻起开始在该信道中发送数据。
结合第三方面的第一种可能的实现方式，在第三方面的第二种可能的实现方式中，该第二确定单元，具体用于从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻等于或晚于该CCA退避过程结束的时刻。
结合第三方面的第二种可能的实现方式，在第三方面的第三种可能的实现方式中，该发送单元，还用于在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，从该CCA退避过程结束的时刻起开始在该信道中发送填充数据，从该目标备选时刻起停止在该信道中发送该填充数据，其中该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的第一个备选时刻。
结合第三方面的第二种可能的实现方式，在第三方面的第四种可能的实现方式中，该第二确定单元，还用于在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，从该CCA退避过程结束的时刻起开始进行CCA检测，从该目标备选时刻起停止进行该CCA检测，其中该目标备选时刻为该备选时刻集合中的晚于该CCA退避过程结束的时刻的第一个该信道是空闲的备选时刻。
结合第三方面，在第三方面的第五种可能的实现方式中，该第二确定单元，具体用于根据该备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数，从[Nmin,q]之间确定初始退避值N，其中q为该第一设备的预设退避阈值，q为大于Nmin的正整数，根据该初始退避值N进行空闲信道评估CCA退避过程，确定当前退避值Nc，确定第二时刻，其中该第二时刻为该当前退避值Nc等于该第一退避阈值Nmin的时刻，从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻不早于该第二时刻，且该目标备选时刻早于第三时刻，其中该第三时刻为该当前退避值Nc等于0的时刻；该发送单元，具体用于从该目标备选时刻起开始在该信道中发送数据。
结合第三方面，在第三方面的第六种可能的实现方式中，该第二确定单元，还用于从该目标备选时刻开始进行空闲信道评估CCA退避过程；该发送单元，具体用于从该CCA退避过程结束的时刻起开始在该信道中发送数据。
结合第三方面或第三方面的上述任一种可能的实现方式，在第三方面的 第七种可能的实现方式中，该第一确定单元，具体用于根据信道中的预设时刻确定该备选时刻集合。
第四方面，本发明实施例提供一种第二设备，该第二设备包括第一确定单元、第二确定单元和接收单元，该第一确定单元，用于确定备选时刻集合；该第二确定单元，用于确定该第一确定单元确定的该备选时刻集合中的每个备选时刻；该接收单元，用于根据该第二确定单元确定的该每个备选时刻在信道中接收数据。
结合第四方面，在第四方面的第一种可能的实现方式中，该接收单元，具体用于在该每个备选时刻对该信道进行信道检测，以便在该信道中接收数据。
结合第四方面，在第四方面的第二种可能的实现方式中，该第二确定单元，还用于根据该每个备选时刻，确定每个空闲信道评估CCA检测的结束时刻；该接收单元，具体用于在该每个CCA检测的结束时刻对该信道进行信道检测，以便在该信道中接收数据。
结合第四方面或第四方面的上述任一种可能的实现方式，在第四方面的第三种可能的实现方式中，该第一确定单元，具体用于根据信道中的预设时刻确定该备选时刻集合。
第五方面，本发明实施例提供一种第一设备，该第一设备包括处理器和发送器，该处理器，用于确定备选时刻集合；该处理器，还用于从该处理器确定的该备选时刻集合中确定目标备选时刻；该发送器，用于根据该处理器确定的该目标备选时刻在信道中发送数据。
结合第五方面，在第五方面的第一种可能的实现方式中，该处理器，具体用于根据空闲信道评估CCA退避过程结束的时刻，从该备选时刻集合中确定该目标备选时刻；该发送器，具体用于从该目标备选时刻起开始在该信道中发送数据。
结合第五方面的第一种可能的实现方式，在第五方面的第二种可能的实现方式中，该处理器，具体用于从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻等于或晚于该CCA退避过程结束的时刻。
结合第五方面的第二种可能的实现方式，在第五方面的第三种可能的实现方式中，该发送器，还用于在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，从该CCA退避过程结束的 时刻起开始在该信道中发送填充数据，从该目标备选时刻起停止在该信道中发送该填充数据，其中该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的第一个备选时刻。
结合第五方面的第二种可能的实现方式，在第五方面的第四种可能的实现方式中，该处理器，还用于在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，从该CCA退避过程结束的时刻起开始进行CCA检测，从该目标备选时刻起停止进行该CCA检测，其中该目标备选时刻为该备选时刻集合中的晚于该CCA退避过程结束的时刻的第一个该信道是空闲的备选时刻。
结合第五方面，在第五方面的第五种可能的实现方式中，该处理器，具体用于根据该备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数，从[Nmin,q]之间确定初始退避值N，其中q为该第一设备的预设退避阈值，q为大于Nmin的正整数，根据该初始退避值N进行空闲信道评估CCA退避过程，确定当前退避值Nc，确定第二时刻，其中该第二时刻为该当前退避值Nc等于该第一退避阈值Nmin的时刻，从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻不早于该第二时刻，且该目标备选时刻早于第三时刻，其中该第三时刻为该当前退避值Nc等于0的时刻；该发送器，具体用于从该目标备选时刻起开始在该信道中发送数据。
结合第五方面，在第五方面的第六种可能的实现方式中，该处理器，还用于从该目标备选时刻开始进行空闲信道评估CCA退避过程；该发送器，具体用于从该CCA退避过程结束的时刻起开始在该信道中发送数据。
结合第五方面或第五方面的上述任一种可能的实现方式，在第五方面的第七种可能的实现方式中，该处理器，具体用于根据信道中的预设时刻确定该备选时刻集合。
第六方面，本发明实施例提供一种第二设备，该第二设备包括处理器和接收器，该处理器，用于确定备选时刻集合；该处理器，还用于确定该处理器确定的该备选时刻集合中的每个备选时刻；该接收器，用于根据该处理器确定的该每个备选时刻在信道中接收数据。
结合第六方面，在第六方面的第一种可能的实现方式中，该接收器，具体用于在该每个备选时刻对该信道进行信道检测，以便在该信道中接收数据。
结合第六方面，在第六方面的第二种可能的实现方式中，该处理器，还用于根据该每个备选时刻，确定每个空闲信道评估CCA检测的结束时刻；该接收器，具体用于在该每个CCA检测的结束时刻对该信道进行信道检测，以便在该信道中接收数据。
结合第六方面或第六方面的上述任一种可能的实现方式，在第六方面的第三种可能的实现方式中，该处理器，具体用于根据信道中的预设时刻确定该备选时刻集合。
上述技术方案中，第一设备发送数据的时刻是根据备选时刻集合中的备选时刻确定的。在此情况下，对应的接收该数据的第二设备也可以根据该备选时刻集合中的备选时刻确定能够接收该数据的时刻。也就是说，第二设备可以仅在系统规定的能够发送数据的时刻对信道进行检测，而在其他时刻无需对信道进行持续检测。因此，上述技术方案能够降低第二设备在检测信道时消耗的功率。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是根据本发明实施例提供的数据传输的方法的示意性流程图。
图2是根据本发明实施例提供的数据传输的方法的示意性流程图。
图3是根据本发明另一实施例提供的数据传输的方法的示意性流程图。
图4是根据本发明另一实施例提供的数据传输的方法的示意图。
图5是根据本发明另一实施例提供的数据传输的方法的示意图。
图6是根据本发明另一实施例提供的数据传输的方法的示意性流程图。
图7是根据本发明另一实施例提供的数据传输的方法的示意图。
图8是根据本发明另一实施例提供的数据传输的方法的示意性流程图。
图9是根据本发明另一实施例提供的数据传输的方法的示意图。
图10是根据本发明实施例提供的第一设备的结构框图。
图11是根据本发明实施例提供的第二设备的结构框图。
图12是根据本发明实施例提供的第一设备的结构框图。
图13是根据本发明实施例提供的第二设备的结构框图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所述的实施例是本发明的一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都应属于本发明保护的范围。
本发明实施例涉及到的设备均是LAA-LTE系统中的设备。更具体地，本发明实施例所涉及的设备均是工作在LBE工作模式下的设备。
本发明实施例所涉及的设备可以是用户设备也可以是网络侧设备。用户设备也可以称为移动终端，如移动电话(或称为“蜂窝”电话)和具有移动终端的计算机，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，本发明并不限定。网络侧设备可以是基站，也可以是接入点(英文：Access Poing，简称“AP”)，本发明并不限定。
本发明实施例中的第一设备、第二设备和第三设备中的“第一”、“第二”和“第三”仅是为了对设备进行区分，而并非对设备的限定。
为了帮助更好的理解本发明，首先对本发明实施例中涉及到的相关要素进行介绍。
空闲信道评估(英文：Clear Channel Assessment，简称“CCA”)退避(英文：backoff)：
设备在占用信道资源发送数据之前会经过CCA退避。具体地，该设备从1到q中随机选择一个整数N作为初始退避值，q可以称为该设备的预设退避阈值，q是预先设定好的大于1的正整数；如果该设备进行CCA检测时确定信道资源未被占用，则将N减1；如果该设备进行CCA检测时确定信道资源被占用，则保持退避值不变，每次进行CCA检测后确定的退避值可以称为当前退避值Nc。设备根据初始退避值以及CCA检测将初始退避值递减的过程可以称为CCA退避。
CCA退避的结果：
CCA退避的结果是指设备进行CCA检测之后得到的当前退避值Nc。
退避条件：
如果设备在进行CCA检测之后确定的当前退避值Nc为0，则可以称为 CCA退避的结果满足退避条件。如果设备在进行CCA检测之后确定的当前退避值Nc为大于0的正整数，则可以称为CCA退避的结果不满足退避条件。
举例来说，设备确定N＝12并开始进行CCA退避。该设备第一次进行CCA检测后，确定信道资源被占用，则该设备确定第一次CCA检测后的当前退避值Nc(1)＝N＝12。该设备进行第二次CCA检测后，确定该信道资源未被占用，则该设备确定第二次CCA检测后的当前退避值Nc(2)＝Nc(1)-1＝11。也就是说，如果第i次CCA检测后确定信道资源被占用，则第i次CCA检测后的当前退避值当前退避值Nc(i)＝Nc(i-1)，其中Nc(i-1)为第i-1次CCA检测后的当前退避值；如果第i次CCA检测后确定该信道资源未被占用，则第i次CCA检测后的当前退避值Nc(i)＝Nc(i-1)-1，其中i为大于1的正整数，Nc(0)＝N。如果第j次CCA检测后的当前退避值Nc(j)＝0，则可以确定第j次CCA检测后的当前退避值Nc满足退避条件。第j次CCA检测结束的时刻即为CCA退避过程的结束时刻。可以理解，j为大于或等于N的正整数，也就是说该设备需要进行至少N次的CCA检测。
本发明实施例中所称的信道或信道资源可以是是非授权频谱上的信道资源，也可以授权频谱上的信道资源。
图1是根据本发明实施例提供的数据传输的方法的示意性流程图。图1所示的方法由第一设备执行，该第一设备可以是LAA-LTE系统中的设备。
101，第一设备确定备选时刻集合。
102，该第一设备从该备选时刻集合中确定目标备选时刻。
103，该第一设备根据该目标备选时刻在信道中发送数据。
根据图1所示的方法，第一设备发送数据的时刻是根据备选时刻集合中的备选时刻确定的。在此情况下，对应的接收该数据的第二设备也可以根据该备选时刻集合中的备选时刻确定能够接收该数据的时刻。也就是说，第二设备可以仅在系统规定的能够发送数据的时刻对信道进行检测，而在其他时刻无需对信道进行持续检测。因此，图1所示的方法能够降低第二设备在检测信道时消耗的功率。
该第一设备可以通过多种方式确定该备选时刻集合，本发明并不对此限定。例如，该备选时刻集合可以是预先配置好保存在该第一设备中的。再如，该备选时刻集合也可以是预先配置好保存在该第一设备中的。在此情况下，该第一设备可以将该备选时刻集合发送给其他设备。又如，该备选时刻集合 也可以是该第一设备确定的。在此情况下，该第一设备可以将该备选时刻集合发送给其他设备。又如，该备选时刻集合还可以是由第三设备发送给该第一设备和第二设备的，其中该第二设备是接收该第一设备发送数据的设备。又如，该备选时刻集合还是该第一设备根据第二设备发送的反馈信息确定的，该第二设备是接收该第一设备发送数据的设备。
该备选时刻集合可以是灵活配置的。例如，该备选时刻集合可以是周期性的，也可以是非周期性的。该备选时刻集合可以是通过一组预设值好的时刻体现的，该备选时刻集合也可以是通过公式体现的。
可选的，作为一个实施例，该第一设备从该备选时刻集合中确定目标备选时刻，包括：该第一设备根据CCA退避过程结束的时刻，从该备选时刻集合中确定该目标备选时刻。在此情况下，该第一设备根据该目标备选时刻，向第二设备发送数据，包括：该第一设备从该目标备选时刻起开始在该信道中发送数据。
可选的，作为一个实施例，该第一设备根据CCA退避过程结束的时刻，从该备选时刻集合中确定该目标备选时刻，包括：该第一设备确定从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻等于或晚于该CCA退避过程结束的时刻。
进一步，在该备选时刻集合中包括该空闲信道评估退避过程结束的时刻的情况下，该目标备选时刻可以等于该空闲信道评估退避过程结束的时刻。在该备选时刻集合中不包括该空闲信道评估退避过程结束的时刻的情况下，该目标备选时刻可以是该备选时刻集合中晚于该空闲信道评估退避过程结束的时刻的备选时刻。
可选的，作为一个实施例，在该目标备选时刻为该备选时刻集合中晚于该空闲信道评估退避过程结束的时刻的备选时刻的情况下，该方法还包括：该第一设备从该空闲信道评估退避过程结束的时刻起开始在该信道中发送填充(英文：padding)数据；该第一设备从该目标备选时刻起停止在该信道中发送该填充数据，其中该目标备选时刻为该备选时刻集合中晚于该空闲信道评估退避过程结束的时刻的第一个备选时刻。这样，该第一设备可以通过发送填充数据放置信道资源被其他设备占用。
可选的，作为另一个实施例，在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，该方法还包括：该第 一设备从该CCA退避过程结束的时刻起开始进行CCA检测；该第一设备从该目标备选时刻起停止进行该CCA检测，其中该目标备选时刻为该备选时刻集合中晚于该CCA避过程结束的时刻的第一个该信道是空闲的备选时刻。换句话说，该目标备选时刻是晚于该CCA退避过程结束的时刻后的一个备选时刻，在该备选时刻信道是空闲的。
可选的，作为另一个实施例，该第一设备从该备选时刻集合中确定该目标备选时刻，包括：该第一设备根据该备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数；该第一设备从[Nmin,q]之间确定初始退避值N，其中q为该第一设备的预设退避阈值，q为大于Nmin的正整数；该第一设备根据该初始退避值N进行CCA退避过程；该第一设备确定当前退避值Nc；该第一设备确定第二时刻，其中该第二时刻为该当前退避值Nc等于该第一退避阈值Nmin的时刻；该第一设备从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻不早于于该第二时刻，且该目标备选时刻早于第三时刻，其中该第三时刻为该当前退避值Nc等于0的时刻；该第一设备根据该目标备选时刻在信道中发送数据，包括：该第一设备从该目标备选时刻起开始在该信道中发送数据。该目标备选时刻可以是该备选时刻集合中晚于该第二时刻的第一个备选时刻。
可选的，作为一个实施例，该第一设备根据该目标备选时刻在该信道中第二设备发送数据，包括：该第一设备从该目标备选时刻开始进行CCA退避；该第一设备从该CCA退避结束的时刻起开始在该信道中发送数据。
进一步，该第一设备确定备选时刻集合，包括：该第一设备根据信道中的预设时刻确定该备选时刻集合。该信道中的预设时刻为以下任一种时刻：该信道中正交频分服务(英文：Orthogonal Frequency Division Multiplexing，简称“OFDM”)符号的开始时刻、该信道中每1/K个OFDM符号对应的时刻、该信道中时隙的开始时刻、该信道中数据子帧的开始时刻、该信道中数据帧的开始时刻、该信道中M个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
举例来说，在预设时刻为该信道中M个采样周期的开始时刻的情况下，备选时刻集合中的第一个备选时刻是在系统帧号为n数据帧的开始时刻，n为正整数或者n可以等于0。该备选时刻集合中的其他备选时刻为该信道上M个采样周期的开始时刻，例如，M可以等于560或624。
再如，在该预设时刻为该信道上1/K个OFDM符号对应的时刻的情况下，K可以取值2或者3。也就是说，该信道上的OFDM符号中的每1/2点或每1/3点作为该备选时刻集合中的备选时刻。
当然，该备选时刻集合中的备选时刻还可以是该信道的子帧内的多个时刻。一个子帧内的备选时刻所在的时刻以及一个子帧内的备选时刻的个数可以是与采样周期相关的。例如，一个子帧内可以预设30个576个采样周期的备选时刻和24个560个采样周期的备选时刻。该30个576个采样周期的备选时刻是指，该子帧内总共设置30个备选时刻，每个备选时刻所在的时刻是576个采样周期的开始时刻。类似的，该24个560个采样周期的备选时刻是指，该子帧内总共设置24个备选时刻，每个备选时刻所在的时刻是560个采样周期的开始时刻。也就是说，该子帧内总共可以有54个备选时刻，该54个备选时刻中的30个备选时刻所在时刻是576个采样周期的开始时刻，该54个备选时刻中的24个备选时刻所在的时刻是560个采样周期的开始时刻。该54个备选时刻的排列顺序并不作限定。再如，一个子帧内可以预设9个640个采样周期的备选时刻和40个624个采样周期的备选时刻。在此情况下，该子帧内总共有49个备选时刻，该49个备选时刻中的9个备选时刻所在的时刻是640个采样周期的开始时刻，该49个备选时刻中的40个备选时刻是624个采样周期的开始时刻。
图2是根据本发明实施例提供的数据传输的方法的示意性流程图。图2所示的方法由第二设备执行，该第二设备可以是LAA-LTE系统中的设备。
201，该第二设备确定备选时刻集合。
202，该第二设备确定该备选时刻集合中的每个备选时刻。
202，该第二时刻根据该每个备选时刻在信道中接收数据。
根据图2所示的方法，第二设备可以根据该备选时刻集合中的每个备选时刻确定能够接收该数据的时刻。也就是说，第二设备可以仅在系统规定的能够发送数据的时刻对信道进行检测，而在其他时刻无需对信道进行持续检测。因此，第二设备在检测信道时所消耗的功率降低了。该第二设备接收的数据可以是图1所示的第一设备发送的。
与图1所示的实施例类似，该第二设备可以通过多种方式获取该备选时刻集合，本发明并不对此限定。例如，该备选时刻集合可以是预先配置好保存在该第一设备和该第二设备中的。再如，该备选时刻集合也可以是预先配 置好保存在第一设备中的。在此情况下，该第二设备可以接收该第一设备发送的该备选时刻集合。又如，该备选时刻集合也可以是该第一设备确定的。在此情况下，该第一设备可以将该发送时刻序列发送给该第二设备。又如，该第二设备还可以确定用于指示该备选时刻集合的反馈信息，并将该反馈信息发送给发送该数据的第一设备。
该备选时刻集合可以是灵活配置的。例如，该备选时刻集合可以是周期性的，也可以是非周期性的。该备选时刻集合可以是通过一组预先设置好的时刻体现的，该备选时刻集合也可以是通过公式体现的，本发明并不对此进行限定。
可选的，作为一个实施例，该第二设备根据该每个备选时刻在信道中接收数据，包括：该第二设备在该每个备选时刻对该信道进行信道检测，以便在该信道中接收数据。
可选的，作为一个实施例，该第二设备根据该每个备选时刻在信道中接收数据，包括：该第二设备根据该每个备选时刻，确定每个CCA检测的结束时刻；该第二设备在该每个CCA检测的结束时刻对该信道进行信道检测，以便在该信道中接收数据。
进一步，该第二设备确定该备选时刻集合，包括：该第二设备根据信道中的预设时刻确定该备选时刻集合。
进一步，该第二设备确定备选时刻集合，包括：该第一设备根据信道中的预设时刻确定该备选时刻集合。该信道中的预设时刻为以下任一种时刻：该信道中正交频分服务(英文：Orthogonal Frequency Division Multiplexing，简称“OFDM”)符号的开始时刻、该信道中每1/K个OFDM符号对应的时刻、该信道中时隙的开始时刻、该信道中数据子帧的开始时刻、该信道中数据帧的开始时刻、该信道中M个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
举例来说，在预设时刻为该信道中M个采样周期的开始时刻的情况下，备选时刻集合中的第一个备选时刻是在系统帧号为n数据帧的开始时刻，n为正整数或者n可以等于0。该备选时刻集合中的其他备选时刻为该信道中M个采样周期的开始时刻，例如，M可以等于560或624。
再如，在该预设时刻为该信道中1/K个OFDM符号对应的时刻的情况下，K可以取值2或者3。也就是说，该信道中的OFDM符号中的每1/2点 或每1/3点作为该备选时刻集合中的备选时刻。
当然，该备选时刻集合中的备选时刻还可以是该信道的子帧内的多个时刻。一个子帧内的备选时刻所在的时刻以及一个子帧内的备选时刻的个数可以是与采样周期相关的。例如，一个子帧内可以预设30个576个采样周期的备选时刻和24个560个采样周期的备选时刻。该30个576个采样周期的备选时刻是指，该子帧内总共设置30个备选时刻，每个备选时刻所在的时刻是576个采样周期的开始时刻。类似的，该24个560个采样周期的备选时刻是指，该子帧内总共设置24个备选时刻，每个备选时刻所在的时刻是560个采样周期的开始时刻。也就是说，该子帧内总共可以有54个备选时刻，该54个备选时刻中的30个备选时刻所在时刻是576个采样周期的开始时刻，该54个备选时刻中的24个备选时刻所在的时刻是560个采样周期的开始时刻。该54个备选时刻的排列顺序并不作限定。再如，一个子帧内可以预设9个640个采样周期的备选时刻和40个624个采样周期的备选时刻。在此情况下，该子帧内总共有49个备选时刻，该49个备选时刻中的9个备选时刻所在的时刻是640个采样周期的开始时刻，该49个备选时刻中的40个备选时刻是624个采样周期的开始时刻。
为了帮助更好的理解本发明，下面将结合具体实施例对本发明进行描述。需要说明的是，下面描述的具体实施例仅是为了帮助更好的理解本发明，而并非对本发明的限制。
图3是根据本发明另一实施例提供的数据传输的方法的示意性流程图。
301，第一设备进行CCA退避并确定CCA退避过程结束的时刻，其中该CCA退避过程结束的时刻为CCA退避的结果满足退避条件的时刻。
具体地，该第一设备进行CCA退避，包括：该第一设备根据CCA确定信道被占用；该第一设备确定初始退避值；该第一设备确定CCA退避的结果并根据CCA退避的结果确定是否满足退避条件；该第一设备在确定根据CCA退避的结果满足退避条件的情况下，完成CCA退避；该第一设备在在确定根据CCA退避的结果不满足退避条件的情况下，继续进行CCA退避。
302，该第一设备从该备选时刻集合中确定是否与该CCA退避过程结束的时刻相同的时刻。
具体地，如果该第一设备确定该备选时刻集合中存在与该CCA退避过程结束的时刻相同的备选时刻，则该第一设备可以确定该CCA退避过程结 束的时刻就是目标备选时刻。如果该第一设备确定该备选时刻集合中不存与该CCA退避过程结束的时刻相同的时刻，则该第一设备可以从该备选时刻集合中的晚于该CCA退避过程结束的时刻的备选时刻中选择该目标备选时刻，其中该目标备选时刻可以是晚于该CCA退避过程结束的时刻的备选时刻。
可选的，作为一个实施例，在该目标备选时刻晚于该CCA退避过程结束的时刻的情况下，该方法还包括步骤303和步骤304。
303，该第一设备从该CCA退避过程结束的时刻起开始使用信道发送填充(英文：padding)数据。
304，该第一设备从该目标备选时刻起停止发送该填充数据，其中该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的第一个备选时刻。
也就是说，第一设备从该CCA退避过程结束的时刻起通过发送填充数据占用了该信道，因此第一设备可以确定该目标备选时刻是晚于该空闲信道评估退避过程结束的时刻的第一个备选时刻。
该第一设备在执行了步骤303和步骤304的情况下，可以占用该信道，以防止其他设备抢占该信道。
可选的，作为另一个实施例，在该目标备选时刻晚于该CCA退避过程结束的时刻的情况下，该方法还可以包括步骤305和步骤306。
305，该第一设备从该CCA退避过程结束的时刻起开始进行CCA检测。
306，该第一设备从该目标备选时刻起停止进行CCA检测，其中该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的第一个该信道空闲的备选时刻。
步骤305和步骤306可以被认为是在当前退避值等于0后，第一设备继续进行CCA检测，直到晚于该CCA退避过程结束的时刻的第一个该信道空闲的备选时刻。也就是说，如果第一设备确定晚于该CCA退避过程结束的时刻的第一个备选时刻该信道被占用，则该第一设备继续进行CCA检测直到晚于该CCA退避过程结束的时刻的第一个该信道空闲的备选时刻。
307，该第一设备从该目标备选时刻起开始在信道中向第二设备发送数据。
308，该第二设备确定该备选时刻集合中的每个备选时刻。
309，该第二设备在该每个备选时刻对该信道进行信道检测，以便在该信道中接收数据。
可以理解的是，该第一设备可能并非在每个发送时刻序列中所指示的时刻起向第二设备发送数据，而第二设备是在每个发送时刻序列中所指示的时刻起对信道进行检测。因此，步骤308和步骤309可以在步骤301至步骤307中的任一个步骤之前或之后执行。
根据图3所示的方法，第一设备发送数据的时刻是预设的备选时刻集合中的备选时刻。第二设备也仅在该备选时刻集合中的备选时刻开始进行信道检测以便接收数据。这样，该第二设备无需持续对信道进行检测也能准确地接收到第一设备发送的数据。在此情况下，第二设备在接收数据上消耗的功率被大大降低了。
图4是根据本发明另一实施例提供的数据传输的方法的示意图。具体地，图4所示的时序图是根据图3所示的数据传输的方法的一个实施例的示意图。
图4所示的时刻t1、t2、t5和t6分别为备选时刻集合中的4个连续的备选时刻。换句话说，t1、t2、t5和t6这四个时刻是数据可能被发送的时刻。因此，第二设备可以在这四个时刻进行信道检测以便准备接收数据。第一设备从时刻t3开始进行CCA退避。时刻t4是第一设备的CCA退避的结果满足退避条件的时刻。时刻t4并非是备选时刻。在此情况下，第一设备从时刻t4开始使用信道发送填充数据。时刻t5是备选时刻集合中的备选时刻。因此，从时刻t5开始，第一设备停止发送填充数据，并开始在信道中发送数据。
图5是根据本发明另一实施例提供的数据传输的方法的示意图。具体地，图5所示的时序图是根据图3所示的数据传输的方法的另一个实施例的示意图。
图5所示的时刻t1、t2、t5和t6分别为备选时刻集合中的4个连续的备选时刻。换句话说，t1、t2、t5和t6这四个时刻是数据可能被发送的时刻。因此，第二设备可以在这四个时刻进行信道检测以便准备接收数据。第一设备从时刻t3开始进行CCA退避。时刻t4是第一设备的CCA退避的结果满足退避条件的时刻。时刻t4并非是备选时刻。在此情况下，第一设备从时刻t4进行CCA检测。在从时刻t4到时刻t5的进行CCA检测未发现信道被占用的情况下，第一设备可以从时刻t5开始使用信道发送数据。可以理解的是， 图5中所示的CCA检测是指从时刻t4至时刻t5的所有的CCA检测。
图6是根据本发明另一实施例提供的数据传输的方法的示意性流程图。
601，第一设备根据备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数。
具体地，第一设备可以通过以下公式确定该第一退避阈值Nmin：
Figure PCTCN2014090515-appb-000001
…………………………………………………………公式1.1
其中，符号“
Figure PCTCN2014090515-appb-000002
”表示向上取整，Δt表示指该备选时刻集合中两个备选时刻之间的时间间隔的最大值，ΔCCA表示CCA检测时隙时长。
602，该第一设备从[Nmin,q]之间确定初始退避值N，其中q为该第一设备的预设退避阈值，q为大于Nmin的正整数。
603，该第一设备根据该初始退避值N进行CCA退避过程。
604，该第一设备在退避到[0,Nmin]范围内时，从该备选时刻集合中确定目标备选时刻。
具体地，该第一设备可以确定第二时刻，其中该第二时刻为当前退避值Nc等于该第一退避阈值Nmin的时刻。该第一设备可以从该备选时刻集合中确定不早于该第二时刻且该备选时刻集合中的位于该第二时刻之后的第一个备选时刻作为该目标备选时刻。在该目标备选时刻，信道是空闲的。根据公式1.1，该当前退避值Nc从Nmin退避到0的时段中存在至少一个该备选时刻集合中的备选时刻。因此该第一设备可以从该备选时刻集合中确定目标备选时刻。当然，该目标备选时刻会早于第三时刻，该第三时刻为该当前退避值Nc等于0的时刻。
605，该第一设备从确定的该目标备选时刻起开始在信道中向第二设备发送数据。
606，该第二设备确定该备选时刻集合中的每个备选时刻。
607，该第二设备在该每个备选时刻对该信道进行信道检测，以便在该信道中接收数据。
可以理解的是，该第一设备可能并非从每个备选时刻起向第二设备发送数据，而第二设备是在每个备选时刻起对信道进行检测。因此，步骤606和步骤607可以在步骤601至步骤605之中的任一个步骤之前或之后执行。
根据图6所示的方法，第一设备发送数据的时刻是预设的备选时刻集合 中的备选时刻。第二设备也仅在该备选时刻集合中的备选时刻开始进行信道检测以便接收数据。这样，该第二设备无需持续对信道进行检测也能准确地接收到第一设备发送的数据。在此情况下，第二设备在接收数据上消耗的功率被大大降低了。
图7是根据本发明另一实施例提供的数据传输的方法的示意图。具体地，图7所示的时序图是根据图6所示的数据传输的方法的示意图。
图7所示的时刻t1、t3和t5为备选时刻集合中的三个连续的备选时刻。换句话说t1、t3和t5这三个时刻是数据可能被发送的时刻。因此，第二设备可以在这三个时刻进行信道检测以便准备接收数据。时刻t2是第一设备开始进行CCA退避的时刻。在时刻t2，该第一设备的当前退避值Nc等于初始退避值N。时刻t4是当前退避值Nc等于Nmin的时刻。如果第一设备继续进行CCA退避至当前退避值Nc等于0，则当前退避值等于0的时刻为时刻t6。可以看出，第一设备可以从时刻t4后的第一个备选时刻起使用信道开始发送数据。同时，第一设备并未等到CCA退避的结果为Nc等于0时才开始发送数据。
图8是根据本发明另一实施例提供的数据传输的方法的示意性流程图。
801，第一设备从备选时刻集合中确定目标备选时刻。
802，该第一设备从该目标备选时刻开始进行CCA退避。
803，该第一设备从CCA退避的结果满足退避条件的时刻起开始在信道中向第二设备发送数据。
804，该第二设备确定该备选时刻集合中的每个备选时刻。
805，该第二设备根据该每个备选时刻，确定每个CCA检测的结束时刻。
由于每个备选时刻都可能是CCA退避的开始时刻并且CCA检测的时长是确定的，因此该第二设备可以根据该每个备选时刻，确定每个CCA检测的结束时刻。
806，该第二设备在该每次CCA检测的结束时刻对该信道进行信道检测，以便在该信道中接收数据。
根据图8所示的方法，开始进行CCA退避的时刻是根据预先设定的备选时刻集合确定的，且每次CCA检测的持续时长是确定的。因此，每次CCA检测的结束时刻也是确定的。第一设备发送数据的起始时刻是CCA检测的结束时刻。因此，第二设备可以从每次CCA检测的结束时刻开始监听信道 资源。这样，第二设备无需在CCA检测过程中持续地进行信道检测，降低了第二设备的功率消耗。
图9是根据本发明另一实施例提供的数据传输的方法的示意图。具体地，图9所示的时序图是根据图8所示的数据传输的方法的示意图。
图9所示的时刻t1、t3和t5是备选时刻集合中的3个连续的备选时刻。第二设备可以根据每个备选时刻，确定每个CCA检测的结束时刻，并在每个CCA检测的结束时刻进行信道检测，以便接收数据。备选时刻t1时，信道资源被占用。从时刻t2开始，信道资源空闲。第一设备从时刻t2后的第一个备选时刻(即时刻t3)开始进行CCA退避。在时刻t4时，CCA退避的结果满足退避条件。第一设备从时刻t4开始发送数据。
图10是根据本发明实施例提供的第一设备的结构框图。如图10所示，第一设备1000包括第一确定单元1001、第二确定单元1002和发送单元1003。
第一确定单元1001，用于确定备选时刻集合。
第二确定单元1002，用于从第一确定单元1001确定的该备选时刻集合中确定目标备选时刻。
发送单元1003，用于根据第二确定单元1002确定的该目标备选时刻在信道中发送数据。
图10所示的第一设备1000发送数据的时刻是根据备选时刻集合中的备选时刻确定的。在此情况下，对应的接收该数据的设备也可以根据该备选时刻集合中的备选时刻确定能够接收该数据的时刻。也就是说，接收该数据的设备可以仅在系统规定的能够发送数据的时刻对信道进行检测，而在其他时刻无需对信道进行持续检测。第一设备1000能够降低接收该数据的设备在检测信道时消耗的功率。
可选的，作为一个实施例，第二确定单元1002，具体用于根据空闲信道评估CCA退避过程结束的时刻，从该备选时刻集合中确定该目标备选时刻。发送单元1003，具体用于从该目标备选时刻起开始在该信道中发送数据。
进一步，第二确定单元1002，具体用于从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻等于或晚于该CCA退避过程结束的时刻。
进一步，发送单元1003，还用于在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，从该CCA退避过程结束的时刻起开始在该信道中发送填充数据，从该目标备选时刻起停止在该 信道中发送该填充数据，其中该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的第一个备选时刻。
进一步，第二确定单元1002，还用于在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，从该CCA退避过程结束的时刻起开始进行CCA检测，从该目标备选时刻起停止进行该CCA检测，其中该目标备选时刻为该备选时刻集合中的晚于该CCA退避过程结束的时刻的第一个该信道是空闲的备选时刻。
可选的，作为另一个实施例，第二确定单元1002，具体用于根据该备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数，从[Nmin,q]之间确定初始退避值N，其中q为该第一设备的预设退避阈值，q为大于Nmin的正整数，根据该初始退避值N进行空闲信道评估CCA退避过程，确定当前退避值Nc，确定第二时刻，其中该第二时刻为该当前退避值Nc等于该第一退避阈值Nmin的时刻，从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻不早于该第二时刻，且该目标备选时刻早于第三时刻，其中该第三时刻为该当前退避值Nc等于0的时刻。发送单元1003，具体用于从该目标备选时刻起开始在该信道中发送数据。
可选的，作为另一个实施例，该第二确定单元1002，还用于从该目标备选时刻开始进行空闲信道评估CCA退避过程。发送单元1003，具体用于从该CCA退避过程结束的时刻起开始在该信道中发送数据。
可选的，作为一个实施例，第一确定单元1001，具体用于根据信道中的预设时刻确定该备选时刻集合。
该信道中的预设时刻为以下任一种时刻：该信道中正交频分服务(英文：Orthogonal Frequency Division Multiplexing，简称“OFDM”)符号的开始时刻、该信道中每1/K个OFDM符号对应的时刻、该信道中时隙的开始时刻、该信道中数据子帧的开始时刻、该信道中数据帧的开始时刻、该信道中M个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
举例来说，在预设时刻为该信道中M个采样周期的开始时刻的情况下，备选时刻集合中的第一个备选时刻是在系统帧号为n数据帧的开始时刻，n为正整数或者n可以等于0。该备选时刻集合中的其他备选时刻为该信道中M个采样周期的开始时刻，例如，M可以等于560或624。
再如，在该预设时刻为该信道中1/K个OFDM符号对应的时刻的情况 下，K可以取值2或者3。也就是说，该信道中的OFDM符号中的每1/2点或每1/3点作为该备选时刻集合中的备选时刻。
当然，该备选时刻集合中的备选时刻还可以是该信道的子帧内的多个时刻。一个子帧内的备选时刻所在的时刻以及一个子帧内的备选时刻的个数可以是与采样周期相关的。例如，一个子帧内可以预设30个576个采样周期的备选时刻和24个560个采样周期的备选时刻。该30个576个采样周期的备选时刻是指，该子帧内总共设置30个备选时刻，每个备选时刻所在的时刻是576个采样周期的开始时刻。类似的，该24个560个采样周期的备选时刻是指，该子帧内总共设置24个备选时刻，每个备选时刻所在的时刻是560个采样周期的开始时刻。也就是说，该子帧内总共可以有54个备选时刻，该54个备选时刻中的30个备选时刻所在时刻是576个采样周期的开始时刻，该54个备选时刻中的24个备选时刻所在的时刻是560个采样周期的开始时刻。该54个备选时刻的排列顺序并不作限定。再如，一个子帧内可以预设9个640个采样周期的备选时刻和40个624个采样周期的备选时刻。在此情况下，该子帧内总共有49个备选时刻，该49个备选时刻中的9个备选时刻所在的时刻是640个采样周期的开始时刻，该49个备选时刻中的40个备选时刻是624个采样周期的开始时刻。
图11是根据本发明实施例提供的第二设备的结构框图。如图11所示第二设备1100包括第一确定单元1101、第二确定单元1102和接收单元1103。
第一确定单元1101，用于确定备选时刻集合。
第二确定单元1102，用于确定第一确定单元1101确定的该备选时刻集合中的每个备选时刻。
接收单元1103，用于根据第二确定单元1102确定的该每个备选时刻在信道中接收数据。
图11所示的第二设备1100可以根据该备选时刻集合中的每个备选时刻确定能够接收该数据的时刻。也就是说，第二设备1100可以仅在系统规定的能够发送数据的时刻对信道进行检测，而在其他时刻无需对信道进行持续检测。因此，第二设备1100在检测信道时所消耗的功率降低了。
可选的，作为一个实施例，接收单元1103，具体用于在该每个备选时刻对该信道进行信道检测，以便在该信道中接收数据。
可选的，作为另一个实施例，第二确定单元1102，还用于根据该每个备 选时刻，确定每个空闲信道评估CCA检测的结束时刻。接收单元1103，具体用于在该每个CCA检测的结束时刻对该信道进行信道检测，以便在该信道中接收数据。
可选的，作为一个实施例，第一确定单元1101，具体用于根据信道中的预设时刻确定该备选时刻集合。
该信道中的预设时刻为以下任一种时刻：该信道中正交频分服务(英文：Orthogonal Frequency Division Multiplexing，简称“OFDM”)符号的开始时刻、该信道中每1/K个OFDM符号对应的时刻、该信道中时隙的开始时刻、该信道中数据子帧的开始时刻、该信道中数据帧的开始时刻、该信道中M个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
举例来说，在预设时刻为该信道中M个采样周期的开始时刻的情况下，备选时刻集合中的第一个备选时刻是在系统帧号为n数据帧的开始时刻，n为正整数或者n可以等于0。该备选时刻集合中的其他备选时刻为该信道中M个采样周期的开始时刻，例如，M可以等于560或624。
再如，在该预设时刻为该信道中1/K个OFDM符号对应的时刻的情况下，K可以取值2或者3。也就是说，该信道中的OFDM符号中的每1/2点或每1/3点作为该备选时刻集合中的备选时刻。
当然，该备选时刻集合中的备选时刻还可以是该信道的子帧内的多个时刻。一个子帧内的备选时刻所在的时刻以及一个子帧内的备选时刻的个数可以是与采样周期相关的。例如，一个子帧内可以预设30个576个采样周期的备选时刻和24个560个采样周期的备选时刻。该30个576个采样周期的备选时刻是指，该子帧内总共设置30个备选时刻，每个备选时刻所在的时刻是576个采样周期的开始时刻。类似的，该24个560个采样周期的备选时刻是指，该子帧内总共设置24个备选时刻，每个备选时刻所在的时刻是560个采样周期的开始时刻。也就是说，该子帧内总共可以有54个备选时刻，该54个备选时刻中的30个备选时刻所在时刻是576个采样周期的开始时刻，该54个备选时刻中的24个备选时刻所在的时刻是560个采样周期的开始时刻。该54个备选时刻的排列顺序并不作限定。再如，一个子帧内可以预设9个640个采样周期的备选时刻和40个624个采样周期的备选时刻。在此情况下，该子帧内总共有49个备选时刻，该49个备选时刻中的9个备选时刻所在的时刻是640个采样周期的开始时刻，该49个备选时刻中的40个备选 时刻是624个采样周期的开始时刻。
图12是根据本发明实施例提供的第一设备的结构框图。如图12所示，第一设备1200处理器1201和发送器1202，
处理器1201，用于确定备选时刻集合。
处理器1201，还用于从处理器1201确定的该备选时刻集合中确定目标备选时刻。
发送器1202，用于根据处理器1201确定的该目标备选时刻在信道中发送数据。
图12所示的第一设备1200发送数据的时刻是根据备选时刻集合中的备选时刻确定的。在此情况下，对应的接收该数据的设备也可以根据该备选时刻集合中的备选时刻确定能够接收该数据的时刻。也就是说，接收该数据的设备可以仅在系统规定的能够发送数据的时刻对信道进行检测，而在其他时刻无需对信道进行持续检测。第一设备1200能够降低接收该数据的设备在检测信道时消耗的功率。
可选的，作为一个实施例，处理器1201，具体用于根据空闲信道评估CCA退避过程结束的时刻，从该备选时刻集合中确定该目标备选时刻。发送器1202，具体用于从该目标备选时刻起开始在该信道中发送数据。
进一步，处理器1201，具体用于从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻等于或晚于该CCA退避过程结束的时刻。
进一步，发送器1202，还用于在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，从该CCA退避过程结束的时刻起开始在该信道中发送填充数据，从该目标备选时刻起停止在该信道中发送该填充数据，其中该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的第一个备选时刻。
进一步，处理器1201，还用于在该目标备选时刻为该备选时刻集合中晚于该CCA退避过程结束的时刻的备选时刻的情况下，从该CCA退避过程结束的时刻起开始进行CCA检测，从该目标备选时刻起停止进行该CCA检测，其中该目标备选时刻为该备选时刻集合中的晚于该CCA退避过程结束的时刻的第一个该信道是空闲的备选时刻。
可选的，作为另一个实施例，处理器1201，具体用于根据该备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数，从[Nmin,q]之间确定初始退避 值N，其中q为该第一设备的预设退避阈值，q为大于Nmin的正整数，根据该初始退避值N进行空闲信道评估CCA退避过程，确定当前退避值Nc，确定第二时刻，其中该第二时刻为该当前退避值Nc等于该第一退避阈值Nmin的时刻，从该备选时刻集合中确定该目标备选时刻，其中该目标备选时刻不早于该第二时刻，且该目标备选时刻早于第三时刻，其中该第三时刻为该当前退避值Nc等于0的时刻。发送器1202，具体用于从该目标备选时刻起开始在该信道中发送数据。
可选的，作为另一个实施例，处理器1201，还用于从该目标备选时刻开始进行空闲信道评估CCA退避过程。发送器1202，具体用于从该CCA退避过程结束的时刻起开始在该信道中发送数据。
可选的，作为一个实施例，处理器1201，具体用于根据信道中的预设时刻确定该备选时刻集合。
该信道中的预设时刻为以下任一种时刻：该信道中正交频分服务(英文：Orthogonal Frequency Division Multiplexing，简称“OFDM”)符号的开始时刻、该信道中每1/K个OFDM符号对应的时刻、该信道中时隙的开始时刻、该信道中数据子帧的开始时刻、该信道中数据帧的开始时刻、该信道中M个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
举例来说，在预设时刻为该信道中M个采样周期的开始时刻的情况下，备选时刻集合中的第一个备选时刻是在系统帧号为n数据帧的开始时刻，n为正整数或者n可以等于0。该备选时刻集合中的其他备选时刻为该信道中M个采样周期的开始时刻，例如，M可以等于560或624。
再如，在该预设时刻为该信道中1/K个OFDM符号对应的时刻的情况下，K可以取值2或者3。也就是说，该信道中的OFDM符号中的每1/2点或每1/3点作为该备选时刻集合中的备选时刻。
当然，该备选时刻集合中的备选时刻还可以是该信道的子帧内的多个时刻。一个子帧内的备选时刻所在的时刻以及一个子帧内的备选时刻的个数可以是与采样周期相关的。例如，一个子帧内可以预设30个576个采样周期的备选时刻和24个560个采样周期的备选时刻。该30个576个采样周期的备选时刻是指，该子帧内总共设置30个备选时刻，每个备选时刻所在的时刻是576个采样周期的开始时刻。类似的，该24个560个采样周期的备选时刻是指，该子帧内总共设置24个备选时刻，每个备选时刻所在的时刻是 560个采样周期的开始时刻。也就是说，该子帧内总共可以有54个备选时刻，该54个备选时刻中的30个备选时刻所在时刻是576个采样周期的开始时刻，该54个备选时刻中的24个备选时刻所在的时刻是560个采样周期的开始时刻。该54个备选时刻的排列顺序并不作限定。再如，一个子帧内可以预设9个640个采样周期的备选时刻和40个624个采样周期的备选时刻。在此情况下，该子帧内总共有49个备选时刻，该49个备选时刻中的9个备选时刻所在的时刻是640个采样周期的开始时刻，该49个备选时刻中的40个备选时刻是624个采样周期的开始时刻。
图13是根据本发明实施例提供的第二设备的结构框图。如图13所示，第二设备1300包括处理器1301和接收器1302，
处理器1301，用于确定备选时刻集合。
处理器1301，还用于确定处理器1301确定的该备选时刻集合中的每个备选时刻。
接收器1302，用于根据处理器1301确定的该每个备选时刻在信道中接收数据。
图13所示的第二设备1300可以根据该备选时刻集合中的每个备选时刻确定能够接收该数据的时刻。也就是说，第二设备1300可以仅在系统规定的能够发送数据的时刻对信道进行检测，而在其他时刻无需对信道进行持续检测。因此，第二设备1300在检测信道时所消耗的功率降低了。
可选的，作为一个实施例，接收器1302，具体用于在该每个备选时刻对该信道进行信道检测，以便在该信道中接收数据。
可选的，作为另一个实施例，处理器1301，还用于根据该每个备选时刻，确定每个空闲信道评估CCA检测的结束时刻。接收器1302，具体用于在该每个CCA检测的结束时刻对该信道进行信道检测，以便在该信道中接收数据。
可选的，作为一个实施例，处理器1301，具体用于根据信道中的预设时刻确定该备选时刻集合。
该信道中的预设时刻为以下任一种时刻：该信道中正交频分服务(英文：Orthogonal Frequency Division Multiplexing，简称“OFDM”)符号的开始时刻、该信道中每1/K个OFDM符号对应的时刻、该信道中时隙的开始时刻、该信道中数据子帧的开始时刻、该信道中数据帧的开始时刻、该信道中M 个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
举例来说，在预设时刻为该信道中M个采样周期的开始时刻的情况下，备选时刻集合中的第一个备选时刻是在系统帧号为n数据帧的开始时刻，n为正整数或者n可以等于0。该备选时刻集合中的其他备选时刻为该信道中M个采样周期的开始时刻，例如，M可以等于560或624。
再如，在该预设时刻为该信道中1/K个OFDM符号对应的时刻的情况下，K可以取值2或者3。也就是说，该信道中的OFDM符号中的每1/2点或每1/3点作为该备选时刻集合中的备选时刻。
当然，该备选时刻集合中的备选时刻还可以是该信道的子帧内的多个时刻。一个子帧内的备选时刻所在的时刻以及一个子帧内的备选时刻的个数可以是与采样周期相关的。例如，一个子帧内可以预设30个576个采样周期的备选时刻和24个560个采样周期的备选时刻。该30个576个采样周期的备选时刻是指，该子帧内总共设置30个备选时刻，每个备选时刻所在的时刻是576个采样周期的开始时刻。类似的，该24个560个采样周期的备选时刻是指，该子帧内总共设置24个备选时刻，每个备选时刻所在的时刻是560个采样周期的开始时刻。也就是说，该子帧内总共可以有54个备选时刻，该54个备选时刻中的30个备选时刻所在时刻是576个采样周期的开始时刻，该54个备选时刻中的24个备选时刻所在的时刻是560个采样周期的开始时刻。该54个备选时刻的排列顺序并不作限定。再如，一个子帧内可以预设9个640个采样周期的备选时刻和40个624个采样周期的备选时刻。在此情况下，该子帧内总共有49个备选时刻，该49个备选时刻中的9个备选时刻所在的时刻是640个采样周期的开始时刻，该49个备选时刻中的40个备选时刻是624个采样周期的开始时刻。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内，因此本发明的保护范围应以权利要求的保护范围为准。

Claims (38)

  1. 一种数据传输的方法，其特征在于，
    第一设备确定备选时刻集合；
    所述第一设备从所述备选时刻集合中确定目标备选时刻；
    所述第一设备根据所述目标备选时刻在信道中发送数据。
  2. 如权利要求1所述的方法，其特征在于，所述第一设备从所述备选时刻集合中确定目标备选时刻，包括：
    所述第一设备根据空闲信道评估CCA退避过程结束的时刻，从所述备选时刻集合中确定所述目标备选时刻；
    所述第一设备根据所述目标备选时刻在信道中发送数据，包括：
    所述第一设备从所述目标备选时刻起开始在所述信道中发送数据。
  3. 如权利要求2所述的方法，其特征在于，所述第一设备根据空闲信道评估CCA退避过程结束的时刻，从所述备选时刻集合中确定所述目标备选时刻，包括：
    所述第一设备从所述备选时刻集合中确定所述目标备选时刻，其中所述目标备选时刻等于或晚于所述CCA退避过程结束的时刻。
  4. 如权利要求3所述的方法，其特征在于，在所述目标备选时刻为所述备选时刻集合中晚于所述CCA退避过程结束的时刻的备选时刻的情况下，所述方法还包括：
    所述第一设备从所述CCA退避过程结束的时刻起开始在所述信道中发送填充数据；
    所述第一设备从所述目标备选时刻起停止在所述信道中发送所述填充数据，其中所述目标备选时刻为所述备选时刻集合中晚于所述CCA退避过程结束的时刻的第一个备选时刻。
  5. 如权利要求3所述的方法，其特征在于，在所述目标备选时刻为所述备选时刻集合中晚于所述CCA退避过程结束的时刻的备选时刻的情况下，所述方法还包括：
    所述第一设备从所述CCA退避过程结束的时刻起开始进行CCA检测；
    所述第一设备从所述目标备选时刻起停止进行所述CCA检测，其中所述目标备选时刻为所述备选时刻集合中的晚于所述CCA退避过程结束的时刻的第一个该信道是空闲的备选时刻。
  6. 如权利要求1所述的方法，其特征在于，所述第一设备从所述备选时刻集合中确定目标备选时刻，包括：
    所述第一设备根据所述备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数；
    所述第一设备从[Nmin,q]之间确定初始退避值N，其中q为所述第一设备的预设退避阈值，q为大于Nmin的正整数；
    所述第一设备根据所述初始退避值N进行空闲信道评估CCA退避过程；
    所述第一设备确定当前退避值Nc；
    所述第一设备确定第二时刻，其中所述第二时刻为所述当前退避值Nc等于所述第一退避阈值Nmin的时刻；
    所述第一设备从所述备选时刻集合中确定所述目标备选时刻，其中所述目标备选时刻不早于所述第二时刻，且所述目标备选时刻早于第三时刻，其中所述第三时刻为所述当前退避值Nc等于0的时刻；
    所述第一设备根据所述目标备选时刻在信道中发送数据，包括：
    所述第一设备从所述目标备选时刻起开始在所述信道中发送数据。
  7. 如权利要求1所述的方法，其特征在于，所述第一设备根据所述目标备选时刻在信道中发送数据，包括：
    所述第一设备从所述目标备选时刻开始进行空闲信道评估CCA退避过程；
    所述第一设备从所述CCA退避过程结束的时刻起开始在所述信道中发送数据。
  8. 如权利要求1至7中任一项所述的方法，其特征在于，所述第一设备确定备选时刻集合包括：
    所述第一设备根据预设时刻确定所述备选时刻集合。
  9. 如权利要求8所述的方法，其特征在于，所述预设时刻为以下任一种时刻：正交频分复用OFDM符号的开始时刻、每1/K个正交频分复用符号对应的时刻、时隙的开始时刻、数据子帧的开始时刻、数据帧的开始时刻、M个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
  10. 一种数据传输的方法，其特征在于，
    第二设备确定备选时刻集合；
    所述第二设备确定所述备选时刻集合中的每个备选时刻；
    所述第二设备根据所述每个备选时刻在信道中接收数据。
  11. 如权利要求10所述的方法，其特征在于，所述第二设备根据所述每个备选时刻在信道中接收数据，包括：
    所述第二设备在所述每个备选时刻对所述信道进行信道检测，以便在所述信道中接收数据。
  12. 如权利要求10所述的方法，其特征在于，所述第二设备根据所述每个备选时刻在信道中接收数据，包括：
    所述第二设备根据所述每个备选时刻，确定每个空闲信道评估CCA检测的结束时刻；
    所述第二设备在所述每个CCA检测的结束时刻对所述信道进行信道检测，以便在所述信道中接收数据。
  13. 如权利要求10至12所述的方法，其特征在于，所述第二设备确定备选时刻集合包括：
    所述第二设备根据预设时刻确定所述备选时刻集合。
  14. 如权利要求13所述的方法，其特征在于，所述预设时刻为以下任一种时刻：正交频分复用OFDM符号的开始时刻、每1/K个OFDM符号对应的时刻、时隙的开始时刻、数据子帧的开始时刻、数据帧的开始时刻、M个采样周期的开始时刻，其中K为大于1的正整数，M为正整数。
  15. 一种第一设备，其特征在于，所述第一设备包括第一确定单元、第二确定单元和发送单元，
    所述第一确定单元，用于确定备选时刻集合；
    所述第二确定单元，用于从所述第一确定单元确定的所述备选时刻集合中确定目标备选时刻；
    所述发送单元，用于根据所述第二确定单元确定的所述目标备选时刻在信道中发送数据。
  16. 如权利要求15所述的设备，其特征在于，所述第二确定单元，具体用于根据空闲信道评估CCA退避过程结束的时刻，从所述备选时刻集合中确定所述目标备选时刻；
    所述发送单元，具体用于从所述目标备选时刻起开始在所述信道中发送数据。
  17. 如权利要求16所述的设备，其特征在于，
    所述第二确定单元，具体用于从所述备选时刻集合中确定所述目标备选时刻，其中所述目标备选时刻等于或晚于所述CCA退避过程结束的时刻。
  18. 如权利要求17所述的设备，其特征在于，所述发送单元，还用于在所述目标备选时刻为所述备选时刻集合中晚于所述CCA退避过程结束的时刻的备选时刻的情况下，从所述CCA退避过程结束的时刻起开始在所述信道中发送填充数据，从所述目标备选时刻起停止在所述信道中发送所述填充数据，其中所述目标备选时刻为所述备选时刻集合中晚于所述CCA退避过程结束的时刻的第一个备选时刻。
  19. 如权利要求17所述的设备，其特征在于，所述第二确定单元，还用于在所述目标备选时刻为所述备选时刻集合中晚于所述CCA退避过程结束的时刻的备选时刻的情况下，从所述CCA退避过程结束的时刻起开始进行CCA检测，从所述目标备选时刻起停止进行所述CCA检测，其中所述目标备选时刻为所述备选时刻集合中的晚于所述CCA退避过程结束的时刻的第一个该信道是空闲的备选时刻。
  20. 如权利要求15所述的设备，其特征在于，所述第二确定单元，具体用于根据所述备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数，从[Nmin,q]之间确定初始退避值N，其中q为所述第一设备的预设退避阈值，q为大于Nmin的正整数，根据所述初始退避值N进行空闲信道评估CCA退避过程，确定当前退避值Nc，确定第二时刻，其中所述第二时刻为所述当前退避值Nc等于所述第一退避阈值Nmin的时刻，从所述备选时刻集合中确定所述目标备选时刻，其中所述目标备选时刻不早于所述第二时刻，且所述目标备选时刻早于第三时刻，其中所述第三时刻为所述当前退避值Nc等于0的时刻；
    所述发送单元，具体用于从所述目标备选时刻起开始在所述信道中发送数据。
  21. 如权利要求15所述的设备，其特征在于，所述第二确定单元，还用于从所述目标备选时刻开始进行空闲信道评估CCA退避过程；
    所述发送单元，具体用于从所述CCA退避过程结束的时刻起开始在所述信道中发送数据。
  22. 如权利要求15至21中任一项所述的设备，其特征在于，所述第一确定单元，具体用于根据预设时刻确定所述备选时刻集合。
  23. 一种第二设备，其特征在于，所述第二设备包括第一确定单元、第二确定单元和接收单元，
    所述第一确定单元，用于确定备选时刻集合；
    所述第二确定单元，用于确定所述第一确定单元确定的所述备选时刻集合中的每个备选时刻；
    所述接收单元，用于根据所述第二确定单元确定的所述每个备选时刻在信道中接收数据。
  24. 如权利要求23所述的设备，其特征在于，所述接收单元，具体用于在所述每个备选时刻对所述信道进行信道检测，以便在所述信道中接收数据。
  25. 如权利要求23所述的设备，其特征在于，所述第二确定单元，还用于根据所述每个备选时刻，确定每个空闲信道评估CCA检测的结束时刻；
    所述接收单元，具体用于在所述每个CCA检测的结束时刻对所述信道进行信道检测，以便在所述信道中接收数据。
  26. 如权利要求23至25中任一项所述的设备，其特征在于，所述第一确定单元，具体用于根据预设时刻确定所述备选时刻集合。
  27. 一种第一设备，其特征在于，所述第一设备包括处理器和发送器，
    所述处理器，用于确定备选时刻集合；
    所述处理器，还用于从所述处理器确定的所述备选时刻集合中确定目标备选时刻；
    所述发送器，用于根据所述处理器确定的所述目标备选时刻在信道中发送数据。
  28. 如权利要求27所述的设备，其特征在于，所述处理器，具体用于根据空闲信道评估CCA退避过程结束的时刻，从所述备选时刻集合中确定所述目标备选时刻；
    所述发送器，具体用于从所述目标备选时刻起开始在所述信道中发送数据。
  29. 如权利要求28所述的设备，其特征在于，
    所述处理器，具体用于从所述备选时刻集合中确定所述目标备选时刻，其中所述目标备选时刻等于或晚于所述CCA退避过程结束的时刻。
  30. 如权利要求29所述的设备，其特征在于，所述发送器，还用于在 所述目标备选时刻为所述备选时刻集合中晚于所述CCA退避过程结束的时刻的备选时刻的情况下，从所述CCA退避过程结束的时刻起开始在所述信道中发送填充数据，从所述目标备选时刻起停止在所述信道中发送所述填充数据，其中所述目标备选时刻为所述备选时刻集合中晚于所述CCA退避过程结束的时刻的第一个备选时刻。
  31. 如权利要求29所述的设备，其特征在于，所述处理器，还用于在所述目标备选时刻为所述备选时刻集合中晚于所述CCA退避过程结束的时刻的备选时刻的情况下，从所述CCA退避过程结束的时刻起开始进行CCA检测，从所述目标备选时刻起停止进行所述CCA检测，其中所述目标备选时刻为所述备选时刻集合中的晚于所述CCA退避过程结束的时刻的第一个该信道是空闲的备选时刻。
  32. 如权利要求27所述的设备，其特征在于，所述处理器，具体用于根据所述备选时刻集合确定第一退避阈值Nmin，其中Nmin为正整数，从[Nmin,q]之间确定初始退避值N，其中q为所述第一设备的预设退避阈值，q为大于Nmin的正整数，根据所述初始退避值N进行空闲信道评估CCA退避过程，确定当前退避值Nc，确定第二时刻，其中所述第二时刻为所述当前退避值Nc等于所述第一退避阈值Nmin的时刻，从所述备选时刻集合中确定所述目标备选时刻，其中所述目标备选时刻不早于所述第二时刻，且所述目标备选时刻早于第三时刻，其中所述第三时刻为所述当前退避值Nc等于0的时刻；
    所述发送器，具体用于从所述目标备选时刻起开始在所述信道中发送数据。
  33. 如权利要求27所述的设备，其特征在于，所述处理器，还用于从所述目标备选时刻开始进行空闲信道评估CCA退避过程；
    所述发送器，具体用于从所述CCA退避过程结束的时刻起开始在所述信道中发送数据。
  34. 如权利要求27至33中任一项所述的设备，其特征在于，所述处理器，具体用于根据预设时刻确定所述备选时刻集合。
  35. 一种第二设备，其特征在于，所述第二设备包括处理器和接收器，
    所述处理器，用于确定备选时刻集合；
    所述处理器，还用于确定所述处理器确定的所述备选时刻集合中的每个备选时刻；
    所述接收器，用于根据所述处理器确定的所述每个备选时刻在信道中接收数据。
  36. 如权利要求35所述的设备，其特征在于，所述接收器，具体用于在所述每个备选时刻对所述信道进行信道检测，以便在所述信道中接收数据。
  37. 如权利要求35所述的设备，其特征在于，所述处理器，还用于根据所述每个备选时刻，确定每个空闲信道评估CCA检测的结束时刻；
    所述接收器，具体用于在所述每个CCA检测的结束时刻对所述信道进行信道检测，以便在所述信道中接收数据。
  38. 如权利要求35至37中任一项所述的设备，其特征在于，所述处理器，具体用于根据预设时刻确定所述备选时刻集合。
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