WO2017015785A1 - 用户设备发送信号的方法和用户设备 - Google Patents

用户设备发送信号的方法和用户设备 Download PDF

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Publication number
WO2017015785A1
WO2017015785A1 PCT/CN2015/085033 CN2015085033W WO2017015785A1 WO 2017015785 A1 WO2017015785 A1 WO 2017015785A1 CN 2015085033 W CN2015085033 W CN 2015085033W WO 2017015785 A1 WO2017015785 A1 WO 2017015785A1
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Prior art keywords
sub
bands
interference
system bandwidth
user equipment
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PCT/CN2015/085033
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English (en)
French (fr)
Inventor
孙卫军
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华为技术有限公司
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Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP15899137.2A priority Critical patent/EP3307004B1/en
Priority to PCT/CN2015/085033 priority patent/WO2017015785A1/zh
Priority to CN201580065312.3A priority patent/CN107006012B/zh
Publication of WO2017015785A1 publication Critical patent/WO2017015785A1/zh
Priority to US15/864,944 priority patent/US10560950B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H04W74/0825—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the embodiments of the present invention relate to communication technologies, and in particular, to a method for a user equipment to send a signal and a user equipment.
  • D2D communication refers to the direct communication between the device and the device. It is generally divided into D2D unicast communication and D2D broadcast/multicast communication. In the D2D unicast communication system, one device only Another device communicates directly. In a D2D broadcast/multicast communication system, a device sends its own data packet to multiple devices in its vicinity.
  • the user equipment when there is no base station or controller participating in the transmission of D2D communication transmission resources, the user equipment will select its own D2D communication transmission resources, and different user equipments can easily select the same time and frequency. Resources to transmit their respective D2D signals, and there is mutual interference between these signals, and the same user equipment cannot transmit and receive on the same time-frequency resource, so the same time-frequency resource is selected on both devices. When transmitting a D2D signal, the two devices cannot receive the D2D signal from the other party.
  • the user equipment when transmits a signal on a sub-band within the system bandwidth, it cannot simultaneously receive signals from other devices in other sub-bands within the system bandwidth, so when the two devices are in different sub-bands within the system bandwidth, When sending their respective D2D signals, the two devices cannot receive D2D signals from the other party.
  • D2D transmission reception failure or erroneous reception may occur.
  • the reliability of D2D communication is low.
  • An embodiment of the present invention provides a method for transmitting a signal by a user equipment and a user equipment, which are used to solve the problem that in the D2D communication, different user equipments select the same resource to send D2D signals to cause interference, or may not receive other signals when transmitting signals. Signals in the frequency band will cause D2D transmission Failure to receive or receive or receive errors, resulting in low reliability of D2D communication.
  • a first aspect of the present invention provides a method for a user equipment to send a signal, including:
  • the user equipment determines a channel detection period
  • the user equipment compares the first interference strength with a first interference threshold
  • the user equipment selects N first from the system bandwidth according to a second interference strength received by each subband in the system bandwidth. a subband, and transmitting a signal on a frequency resource corresponding to the N first subbands; the N is a positive integer;
  • the sum of the second interference strengths received by the N first sub-bands is less than or equal to the second interference strength corresponding to any N sub-bands other than the N first sub-bands in the system bandwidth. with.
  • the method further includes:
  • the user equipment determines whether the transmission resource application time reaches a maximum duration of the preset transmission resource request
  • the user equipment selects M first sub-bands from the system bandwidth according to a second interference strength received by each sub-band within the system bandwidth. And transmitting a signal on the frequency resource corresponding to the M first sub-bands; the M is a positive integer;
  • the sum of the second interference strengths received by the M first sub-bands is less than or equal to the second interference strength corresponding to any other M sub-bands other than the M first sub-bands in the system bandwidth. with.
  • the second interference strength of each of the N first subbands is less than or equal to the N first sub The second interference strength of any other subband outside the frequency band.
  • the second interference strength of each of the first sub-bands of the M first sub-bands is less than or equal to a second interference strength of any of the sub-bands except the M first sub-bands.
  • the signal sent by the user equipment includes a channel reservation signal And/or data signals
  • the channel reservation signal is a signal for indicating a sub-band selected by the user equipment in the system bandwidth; the data signal includes data information of the user equipment.
  • the signal sent by the user equipment includes a channel reservation signal and a data signal, in the N first sub
  • the signal is transmitted on the frequency resource corresponding to the frequency band, including:
  • the user equipment After the channel detection period ends, the user equipment sends the channel reservation signal on a frequency resource corresponding to the N first sub-bands;
  • the user equipment After transmitting the channel reservation signal, the user equipment sends the data signal on a frequency resource corresponding to the N first sub-bands.
  • the signal sent by the user equipment includes a channel reservation signal and a data signal, where the M first sub The signal is transmitted on the frequency resource corresponding to the frequency band, including:
  • the user equipment After the channel detection period ends, the user equipment sends the channel reservation signal on a frequency resource corresponding to the M first sub-bands;
  • the user equipment After transmitting the channel reservation signal, the user equipment sends the data signal on a frequency resource corresponding to the M first sub-bands.
  • the channel detection period includes at least one channel evaluation CCA
  • the first interference strength is less than or equal to the first interference threshold, and the first interference strength corresponding to each CCA time slot in the channel detection period is less than or equal to the first interference. Threshold.
  • the user equipment receives the second interference according to each subband in the system bandwidth Intensity, selecting N first sub-bands from within the system bandwidth, including:
  • the user equipment selects N first sub-bands from the system bandwidth according to a size of a data packet to be sent and a second interference strength received by each sub-band within the system bandwidth;
  • the user equipment selects N first sub-bands from the system bandwidth according to a preset number of sub-bands occupied by each data packet and a second interference strength received by each sub-band within the system bandwidth.
  • the user equipment is received according to each subband in the system bandwidth
  • the second interference strength, selecting M first sub-bands from the system bandwidth including:
  • the user equipment selects M first sub-bands from the system bandwidth according to a size of a data packet to be sent and a second interference strength received by each sub-band within the system bandwidth;
  • the user equipment selects M first sub-bands from the system bandwidth according to a preset number of sub-bands occupied by each data packet and a second interference strength received by each sub-band within the system bandwidth.
  • the N first sub-bands are N sub-bands of frequency continuous in a system bandwidth.
  • the M first sub-bands are M sub-bands of frequency continuous within a system bandwidth.
  • a second aspect of the present invention provides a user equipment, including:
  • An acquisition module configured to determine a channel detection period
  • a detecting module configured to acquire a first interference strength within a system bandwidth during the channel detection period, and acquire a second interference strength received by each sub-band within the system bandwidth;
  • the first interference strength is the The sum of the interference intensities of each subband within the system bandwidth;
  • a processing module configured to compare the first interference strength with a first interference threshold
  • the processing module compares that the first interference strength is less than or equal to the first interference threshold, the processing module is further configured to: according to the second interference strength received by each subband in the system bandwidth, Selecting N first sub-bands in the system bandwidth; wherein the N is a positive integer; the sum of the second interference strengths received by the N first sub-bands is less than or equal to the N first sub-bands The sum of the second interference intensities corresponding to any other N subbands outside the frequency band;
  • a sending module configured to send a signal on a frequency resource corresponding to the N first subbands.
  • the processing module Also used for:
  • the processing module determines that the transmission resource application time is greater than or equal to the maximum duration, selecting M first sub-subjects from the system bandwidth according to a second interference strength received by each sub-band within the system bandwidth. a frequency band, and transmitting, by the sending module, a signal on a frequency resource corresponding to the M first sub-bands; the M is a positive integer;
  • the sum of the second interference strengths received by the M first sub-bands is less than or equal to the second interference strength corresponding to any other M sub-bands other than the M first sub-bands in the system bandwidth. with.
  • the second interference strength of each of the first sub-bands selected by the processing module is less than or equal to A second interference strength of any of the N subbands other than the first subband.
  • the first sub-band of each of the M first sub-bands selected by the processing module The second interference strength is less than or equal to the second interference strength of any one of the sub-bands except the M first sub-bands.
  • the sending module if the signal sent by the sending module includes a channel reservation signal and a data signal, the sending module Specifically used for:
  • the channel reservation signal is a signal for indicating the at least one first sub-band selected by the user equipment in the system bandwidth; the data signal includes data information of the user equipment.
  • the sending module is specifically configured to:
  • the channel reservation signal is a signal for indicating the at least one first sub-band selected by the user equipment in the system bandwidth; the data signal includes data information of the user equipment.
  • the channel detection period includes at least one channel evaluation CCA
  • the first interference strength that is compared by the processing module is less than or equal to the first interference threshold, and includes: the first interference strength corresponding to each CCA time slot in the channel detection period is less than or equal to The first interference threshold is described.
  • the processing module is specifically configured to:
  • N first sub-bands are selected from the system bandwidth according to a preset number of sub-bands occupied by each data packet and a second interference strength received by each sub-band within the system bandwidth.
  • the processing module is specifically configured to:
  • the M first sub-bands are selected from the system bandwidth according to a preset number of sub-bands occupied by each data packet and a second interference strength received by each sub-band within the system bandwidth.
  • a third aspect of the present invention provides a user equipment, including: a processor and a transmitter;
  • the processor is used to:
  • the first interference strength being a sum of interference strengths of each sub-band within the system bandwidth
  • the processor compares that the first interference strength is less than or equal to the first interference threshold, selecting N from the system bandwidth according to a second interference strength received by each subband in the system bandwidth.
  • a first sub-band wherein the N is a positive integer; a sum of second interference strengths received by the N first sub-bands is less than or equal to a system bandwidth other than the N first sub-bands The sum of the second interference intensities corresponding to any other N subbands;
  • the transmitter is configured to send a signal on a frequency resource corresponding to the N first sub-bands.
  • the method for transmitting a signal by a user equipment and a user equipment are provided by the user equipment, and the user equipment detects a first interference intensity in a system bandwidth and a second interference intensity in each sub-band within the system bandwidth by using a channel detection period acquired, And comparing the first interference strength with the first interference threshold, and if the first interference strength is less than the first interference threshold, according to the second interference intensity received by each sub-band within the system bandwidth, Selecting N first sub-bands with less interference within the system bandwidth, and transmitting signals on the N first sub-bands, that is, by considering interference within the entire bandwidth and interference of each sub-band, in the entire system
  • the interference is small, it means that the neighboring user equipment does not send a signal, which avoids the transmission collision, that is, avoids the neighboring equipment to perform signal transmission on different sub-bands at the same time, and selects the sub-band with small interference for signal transmission, that is, The other devices that generate interference in these sub-bands are far away, further reducing transmission interference,
  • FIG. 1 is a schematic diagram of a communication scenario of the present invention
  • Embodiment 1 is a flowchart of Embodiment 1 of a method for transmitting a signal by a user equipment according to the present invention
  • Embodiment 3 is a flowchart of Embodiment 2 of a method for transmitting a signal by a user equipment according to the present invention
  • Embodiment 4 is a flowchart of Embodiment 3 of a method for transmitting a signal by a user equipment according to the present invention
  • FIG. 5 is a schematic diagram of partitioning in a subframe according to a method for transmitting a signal by a user equipment according to the present invention
  • FIG. 6 is a schematic flowchart of an example of a method for transmitting a signal by a user equipment according to the present invention
  • FIG. 7 is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention.
  • FIG. 8 is a schematic structural diagram of Embodiment 3 of a user equipment according to the present invention.
  • FIG. 1 is a schematic diagram of a communication scenario according to the present invention.
  • the solution of the present invention can be applied to send signals to other devices or receive signals sent by other devices.
  • the communication scenario includes at least two devices, and the device in the present invention can perform D2D communication. Or other wired and wireless communication terminal devices, which may also be other network devices, hereinafter collectively referred to as user devices.
  • the device includes three mobile phones that can perform D2D communication.
  • the device in the present invention is not limited to a mobile phone, and may be a tablet computer, an intelligent terminal, a network device, or the like, and is not limited.
  • Embodiment 1 is a flowchart of Embodiment 1 of a method for transmitting a signal by a user equipment according to the present invention.
  • the execution body of the solution is a user equipment, and the device needs to send a signal before
  • suitable transmission resources such as resources in the time domain and the frequency domain
  • the solution is mainly a process of resource selection and transmission involving D2D communication, and specific steps of the method for the user equipment to send signals include:
  • S101 The user equipment determines a channel detection period.
  • the channel detection period may be pre-configured or pre-defined in the protocol, and the channel detection period indicates the maximum time length allowed for detecting a channel, and the specific duration may be randomly selected or according to the current A traffic detection period, such as the priority of a packet, selects a channel detection period. For example, if the current packet has a high priority, the user equipment can select a shorter channel detection period.
  • the user equipment acquires a first interference strength within a system bandwidth during the channel detection period, and acquires a second interference strength of each sub-band within the system bandwidth.
  • the interference signal in the entire system bandwidth is detected in the entire channel detection period to obtain a first interference strength, where the first interference strength is used to indicate the system bandwidth.
  • the size of the interference signal which may be the sum of the interference signal strengths of each sampling point in the channel detection period within the system bandwidth, or may be within the system bandwidth, each sampling in the channel detection period.
  • the interference signal strength may be the power of the interference signal, or the amplitude of the interference signal, and the interference signal strength may indicate the interference size, and the specificity is not limited.
  • the system bandwidth may be an uplink frequency bandwidth or a downlink frequency bandwidth of a frequency division duplexing (FDD) system, or a frequency bandwidth of a Time Division Duplexing (TDD) system.
  • FDD frequency division duplexing
  • TDD Time Division Duplexing
  • the channel detection period includes at least one Clear Channel Assessment (CCA) time slot, and therefore is sampled on each CCA time slot in the channel detection period, and the power average or power of the interference signal of all the sampling points And as the first interference intensity.
  • CCA Clear Channel Assessment
  • the interference received by each sub-band within the bandwidth of the system ie the second interference strength
  • One way to obtain the second interference intensity on each sub-band is to perform frequency domain transform on the received signal, and measure the power of each sub-carrier signal on the sub-band, and the sum of the powers of all sub-carrier signals on the sub-band is taken as The interference strength of this sub-band.
  • S103 The user equipment compares the first interference strength with a pre-acquired first interference threshold.
  • the user equipment may pre-configure or appoint a first interference threshold of the interference signal strength in the protocol. If the obtained first interference strength is the sum of the interference signal strengths, the setting of the first interference threshold needs to be set considering the sum of the interference signal strengths within the system bandwidth, if the first interference strength is an average of the interference signal strengths. Value, then the first interference threshold is set based on the average of the interference signal strength.
  • the first interference threshold may be determined by the device according to the channel usage status. For example, if the current channel is busy, a smaller interference threshold may be selected. This can increase the difficulty for a user equipment to obtain transmission resources, thereby reducing mutual interference caused by signals transmitted by multiple devices.
  • the first interference threshold may also be determined according to the service characteristics of the data packet to be sent. For example, a data packet sensitive to the transmission time delay may use a larger interference threshold or the like. This allows these packets to get transmission resources faster.
  • the device selects N first sub-bands from the system bandwidth according to a second interference strength received by each sub-band within the system bandwidth, and sends a signal on a corresponding frequency resource on the N first sub-bands
  • the N is a positive integer.
  • the channel detection period includes multiple CCA slots, so the foregoing first interference strength is less than or equal to the first interference threshold, and preferably represents each CCA in the channel detection period.
  • the first interference intensity corresponding to the time slot is less than or equal to the interference threshold.
  • the interference threshold If it is detected that the first interference strength in the channel is less than the interference threshold, it means that the signal transmitted in the current channel is less or less interfered by other signals, so as to further ensure the reliability of the transmitted D2D signal, And selecting, according to the second interference intensity of each sub-band, one or more (N) first sub-bands with less interference in the above-mentioned channels for transmission, and selecting the second N sub-bands received by the selected second sub-band
  • the sum of the interference strengths is less than or equal to the sum of the second interference strengths corresponding to any of the N sub-bands other than the N first sub-bands allowed by the device within the system bandwidth.
  • the method includes the following two cases: in the selected N first sub-bands, the second interference intensity corresponding to each of the first sub-bands is less than or equal to the N first sub-bands The second interference strength of any other subband.
  • the N first sub-bands are consecutive, and the sum of the second interference strengths received by the N first sub-bands is less than the second received on any other N sub-bands allowed by the device in the system bandwidth.
  • the sum of the interference intensities is to select some sub-bands with relatively small interference in the channel to transmit signals.
  • the method for transmitting a signal by the device detects a first interference strength within a system bandwidth and a second interference strength received by each sub-band within the system bandwidth by using a preset channel detection period, and An interference strength is compared with a first interference threshold, and if the first interference strength is less than the first interference threshold, the second interference strength received according to each subband within the system bandwidth, from the system bandwidth.
  • the internal selection is transmitted by the N first sub-bands with less interference, and the signal is transmitted when the whole system has less interference, thereby avoiding transmission collision, that is, avoiding adjacent devices simultaneously transmitting signals on the same sub-band, and selecting
  • the sub-band with small interference performs signal transmission, and other devices that interfere with the selected sub-band have a long distance, further reducing transmission interference, thereby effectively improving the reliability of data transmission.
  • Embodiment 3 is a flowchart of Embodiment 2 of a method for transmitting a signal by a user equipment according to the present invention, as shown in FIG. 3,
  • the method for the user equipment to send a signal further includes:
  • "achieve” described herein means equal to or greater than, that is, whether the resource application time has been equal to or has been greater than a preset maximum duration.
  • the user equipment selects M first sub-subjects from the system bandwidth according to a second interference strength received by each sub-band within the system bandwidth. a frequency band, and transmitting a signal on a frequency resource corresponding to the M first sub-bands; the M is a positive integer.
  • the user equipment may wait and continue to detect in the next channel detection period, but in the specific implementation, the general situation protocol specifies the transmission resource application in the communication process. The maximum duration, the user equipment cannot always wait endlessly. Therefore, it is necessary to judge whether the application time of the transmission resource for transmitting the resource for this communication has reached the maximum time of the protocol or the preset transmission resource application. If the maximum time allowed is not reached, the device may wait until the next channel detection period continues to detect. If the transmission resource application time has reached the maximum allowed time, or the other communication process is detected, the communication request is detected.
  • the communication must be performed, that is, according to the second interference intensity received by each sub-band within the bandwidth in the same manner as in the first embodiment, the system bandwidth is selected.
  • M first sub-bands for signalling Transmit the sum of the second interference strengths of the M first sub-bands is less than or equal to the sum of the second interference strengths corresponding to any other M sub-bands other than the M first sub-bands in the system bandwidth.
  • the M mode is selected from the system bandwidth, or the implementation manner is similar to the method of selecting N first sub-bands from the system bandwidth, at least the following two types:
  • An implementation manner is: the foregoing user equipment (ie, the transmitting side device) selects M from the system bandwidth according to the size of the data packet to be sent and the second interference strength received by each subband in the system bandwidth. Or N) first sub-bands;
  • the device ie, the transmitting side device receives the second interference intensity according to the preset number of subbands occupied by each data packet and each subband in the system bandwidth. M (or N) first sub-bands are selected within the system bandwidth.
  • selecting a sub-band with less interference for subsequent D2D signal transmission may cause subsequent D2D data transmission to be less interfered, thereby improving the reliability of D2D data transmission.
  • the method for transmitting a signal by the device detects a first interference strength in a system bandwidth and a second interference strength received in each sub-band within the system bandwidth in a channel detection period acquired in advance, in a transmission resource.
  • the application time has reached the maximum duration, according to the second interference intensity received by each sub-band within the system bandwidth, the at least one first sub-band that is less interfered is selected from the system bandwidth, and the interference is selected by the selection.
  • the sub-band transmits signals to avoid interference of signals of other devices that are close to each other to the sub-band selected by the user equipment, and reduces transmission interference, thereby effectively improving the reliability of data transmission.
  • Embodiment 3 is a flowchart of Embodiment 3 of a method for transmitting a signal by a user equipment according to the present invention.
  • the signal includes a channel reservation signal and/or a data signal.
  • the channel reservation signal is a signal for indicating a first sub-band selected within the system bandwidth, at least indicating a first sub-band selected by the terminal device within the system bandwidth and/or occupied by the terminal device data transmission Subband.
  • the data signal includes data information of the device, such as a data packet or the like. Taking N first sub-bands as an example in the first embodiment, a specific step of transmitting signals on the N first sub-bands is:
  • the user equipment After the channel detection period ends, the user equipment sends the channel reservation signal on a frequency resource corresponding to the N first sub-bands.
  • the channel reservation signal includes one or more OFDM or SC-FDMA symbols, and after the end of the channel detection period, only corresponds to the first sub-band selected by the device.
  • the channel reservation signal is transmitted on the frequency resource.
  • the length of one OFDM symbol or SC-FDMA symbol in the channel reservation signal may be equal to the length of one CCA slot.
  • the channel reservation signal is transmitted after the channel detection period of the device ends and continues until a system configured or protocol agreed time. For example, the time agreed by this protocol may be the end time of the third SC-FDMA symbol of a certain subframe.
  • the user equipment After transmitting the channel reservation signal, the user equipment sends the data signal on a frequency resource corresponding to the N first sub-bands.
  • the user equipment after transmitting the channel reservation signal, the user equipment continues to transmit its data signal on the sub-band selected by the user equipment.
  • the terminal device may Send its own channel reservation signal and/or data signal.
  • the 'other signal transmission condition' may be that the transmission resource application time corresponding to the data packet has reached the maximum value allowed by the system, and the transmission resource application time of the data packet may be defined as a transmission resource application from a data packet or The channel detects the time elapsed at the current time. It can also be a condition that other configurations conform to the transmission signal, and is not limited.
  • the D2D signal includes a D2D channel reservation signal and/or a D2D data signal.
  • the transmission mode is the same as above, that is, after the end of the channel detection period, the D2D channel reservation signal is transmitted on the selected first sub-band, and the D2D data signal is transmitted after the transmission is completed.
  • transmitting the signals on the frequency resources corresponding to the M first sub-bands in the second embodiment includes:
  • the user equipment After the channel detection period ends, the user equipment sends the channel reservation signal on a frequency resource corresponding to the M first sub-bands;
  • the user equipment After transmitting the channel reservation signal, the user equipment sends the data signal on a frequency resource corresponding to the M first sub-bands.
  • the selected M first sub-bands are M sub-bands with continuous frequency within the system bandwidth.
  • FIG. 5 is a schematic diagram of partitioning in a subframe according to a method for transmitting a signal by a user equipment according to the present invention.
  • D2D channel detection and D2D data transmission are all completed in one subframe.
  • This subframe can be a subframe of LTE.
  • the terminal device selects a channel detection period and performs detection of the first interference strength.
  • the device selects the first sub-band with less interference, and detects the channel After the end of the period, the D2D channel reservation signal and/or the D2D data signal are transmitted on the frequency resources corresponding to the sub-bands.
  • the D2D guard interval is placed behind the D2D data signal to provide hardware conversion time for the terminal device from transmission to reception or reception.
  • FIG. 6 is a schematic flowchart of an example of a method for transmitting a signal by a device according to the present invention. As shown in FIG. 6 , in a practical application, a specific method of a method for a device of a terminal device to send a signal is:
  • S401 Select a channel detection period, where the channel detection period includes one CCA slot, and I is a positive integer greater than or equal to 1.
  • the length of a CCA slot can be a few microseconds, such as 9 microseconds.
  • the system can be configured or protocol to pre-specify the maximum allowable length of time for a channel detection period.
  • S402 In the i-th CCA time slot, detect whether the first interference strength in the system bandwidth is greater than the first interference threshold.
  • step S403 If the first interference strength in the system bandwidth of the i-th CCA slot is greater than the first interference threshold, step S403 is performed, otherwise step S404 is performed.
  • the initial value of i is 1, that is, the interference signal within the bandwidth of the detection system is sampled from the first CCA slot of a channel detection period, and the mean or sum of the strengths of the interference signals is calculated as the first interference strength.
  • a specific implementation manner is: accumulating and averaging the powers of all sampling points in a CCA time slot to obtain an average power of the sample points in the CCA time slot, and the average power is used as the first system bandwidth of the CCA time slot. Interference intensity.
  • the terminal device can measure the first interference strength in the entire system bandwidth obtained in one CCA slot Compare with the interference threshold.
  • the 'interference threshold' may be system configured or protocol agreed or the device may determine itself based on the characteristics of the packet service. For example, packets that are sensitive to transmission time delay can use smaller thresholds and the like.
  • this step is the looping step of step S402, and the execution is repeated when the value of i is increased by 1, so the same description is used in the drawing, if the system bandwidth in the i+1th CCA slot is the same. If the interference strength is less than the first interference threshold, detecting the i+2th CCA time slot, performing this step repeatedly, when the first interference intensity in the M CCA time slots in the channel detection period is smaller than the first interference For the threshold value, S405 is performed. If the first interference intensity in the CCA slot is greater than the first interference threshold, S404 is performed. In essence, the step S403 is the same step, except that the value of i is incremented by one, and the specific procedure refers to the drawing.
  • S404 Determine whether the transmission resource application time reaches a maximum duration of the preset transmission resource application.
  • step S405 is performed.
  • S405 Select at least one first sub-band from within the system bandwidth.
  • the terminal device selects the first sub-band according to the second interference strength on each sub-band of the system bandwidth, and generally selects a sub-band that is relatively less interfered.
  • S406 Send a D2D signal on a corresponding frequency resource on the at least one first sub-band.
  • the terminal device device after the terminal device device measures the second interference strength received on each sub-band in the entire system bandwidth, and both are less than or equal to the interference threshold or meet other transmission conditions, the terminal device according to the data packet to be transmitted by the terminal device.
  • the size selects one or more first sub-bands, or the system stipulates that the number of sub-bands occupied by one data packet selects one or more first sub-bands.
  • the second interference strength on the sub-band is performed by performing frequency domain transformation on the received signal, measuring the power of each sub-carrier signal on the corresponding sub-band, and the sum of the powers of all sub-carrier signals on the sub-band as the sub-band Second interference intensity.
  • the D2D signal includes a channel reservation and a D2D data signal, as shown in FIG. 5, when the signal is transmitted, after the channel detection period elapses, the channel reservation signal is first transmitted, and after the channel reservation signal is transmitted, the D2D data is transmitted.
  • the method for transmitting a signal by the device provided in this embodiment by measuring the interference size in the entire system bandwidth, performs D2D data signal transmission when the interference in the entire system bandwidth is less than the threshold value.
  • the half-duplex problem can be overcome, that is, the adjacent devices are prevented from simultaneously transmitting D2D data signals on different sub-bands, and further, by selecting sub-bands with less interference and transmitting D2D data signals on the sub-bands, Reduce the interference of D2D transmission, thereby improving the reliability of D2D data transmission.
  • the present invention can introduce other devices to perform channel detection by introducing a channel reservation signal, indicating a sub-band selected by a device and a sub-band occupied by subsequent data transmission of the device, and selecting a sub-band with less interference for subsequent use.
  • D2D data signal transmission can make subsequent D2D data transmission less interfered, thereby more effectively improving the reliability of D2D data transmission.
  • FIG. 7 is a schematic structural diagram of Embodiment 1 of a user equipment according to the present invention.
  • the user equipment 10 includes: an obtaining module 11, a detecting module 12, a processing module 13, and a sending module 14.
  • the obtaining module 11 is configured to determine a channel detection period
  • the detecting module 12 is configured to acquire a first interference strength within a system bandwidth during the channel detection period, and acquire a second interference strength received by each sub-band within the system bandwidth; the first interference strength is The sum of the interference strengths of each subband within the system bandwidth;
  • the processing module 13 is configured to compare the first interference strength with the first interference threshold
  • the processing module 13 compares that the first interference strength is less than or equal to the first interference threshold, the processing module 13 is further configured to receive a second interference strength according to each subband within the system bandwidth. Selecting N first sub-bands from the system bandwidth; wherein the N is a positive integer; the sum of the second interference strengths received by the N first sub-bands is less than or equal to the N-th The sum of the second interference intensities corresponding to any other N subbands outside a subband;
  • the sending module 14 is configured to send a signal on a frequency resource corresponding to the N first sub-bands.
  • the user equipment provided in this embodiment is used to perform the technical solution of the method embodiment shown in any one of FIG. 1 to FIG. 6, and the implementation principle and the technical effect are similar.
  • the first interference strength is obtained by detecting an interference signal in the system bandwidth. Compared with the set first interference threshold, when the first interference strength in the system bandwidth is less than the first interference threshold, that is, the interference within the system bandwidth is small, and no device is sent near the user equipment, and then according to The second interference intensity of each sub-band within the system bandwidth is selected to transmit a signal in a sub-band with a second interference intensity to further reduce transmission interference, thereby improving reliability of data transmission.
  • the processing module 13 is further configured to:
  • the processing module 13 determines that the transmission resource application time is greater than or equal to the maximum duration, selects M segments from the system bandwidth according to a second interference strength received by each subband within the system bandwidth. a sub-band, and transmitting, by the sending module 14, a frequency resource corresponding to the M first sub-bands; the M is a positive integer;
  • the sum of the second interference strengths received by the M first sub-bands is less than or equal to the second interference strength corresponding to any other M sub-bands other than the M first sub-bands in the system bandwidth. with.
  • the second interference strength of each of the N first subbands selected by the processing module 13 is less than or equal to any other than the N first subbands.
  • the second interference strength of the frequency band is less than or equal to any other than the N first subbands.
  • the second interference strength of each of the M first subbands selected by the processing module 13 is less than or equal to any other than the M first subbands.
  • the second interference strength of the frequency band is less than or equal to any other than the M first subbands.
  • the sending module 14 is specifically configured to:
  • the channel reservation signal is a signal for indicating the at least one first sub-band selected by the user equipment in the system bandwidth; the data signal includes data information of the user equipment.
  • the sending module 14 is specifically configured to:
  • the channel reservation signal is a signal for indicating the at least one first sub-band selected by the user equipment in the system bandwidth; the data signal includes data information of the user equipment.
  • the channel detection period includes at least one channel evaluation CCA time slot, and the first interference strength that is compared by the processing module 13 is less than or equal to the first interference threshold, including: the channel detection period.
  • the first interference strength corresponding to each CCA time slot is less than or equal to the first interference threshold.
  • processing module 13 is specifically configured to:
  • N first sub-bands are selected from the system bandwidth according to a preset number of sub-bands occupied by each data packet and a second interference strength received by each sub-band within the system bandwidth.
  • processing module 13 is specifically configured to:
  • the M first sub-bands are selected from the system bandwidth according to a preset number of sub-bands occupied by each data packet and a second interference strength received by each sub-band within the system bandwidth.
  • the user equipment provided in this embodiment is used to perform the technical solution of the method embodiment shown in FIG. 1 to FIG. 6.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 8 is a schematic structural diagram of Embodiment 3 of a user equipment according to the present invention.
  • the user equipment 20 includes: a processor 21 and a transmitter 22;
  • the processor 21 is configured to: determine a channel detection period; acquire, in the channel detection period, a first interference strength within a system bandwidth, and acquire a second interference strength received by each sub-band within the system bandwidth;
  • the first interference strength is a sum of interference strengths of each sub-band within the system bandwidth; comparing the first interference strength with a first interference threshold;
  • the processor 21 compares that the first interference strength is less than or equal to the first interference threshold, selects from the system bandwidth according to a second interference strength received by each subband within the system bandwidth.
  • N is a positive integer; the sum of the second interference intensities received by the N first sub-bands is less than or equal to the system bandwidth except the N first sub-bands The sum of the second interference intensities corresponding to any other N subbands;
  • the transmitter 22 is configured to send a signal on a frequency resource corresponding to the N first sub-bands.
  • the processor 21 is further configured to:
  • the device 21 determines that the transmission resource application time is greater than or equal to the maximum duration, selects M segments from the system bandwidth according to a second interference strength received by each subband within the system bandwidth. a sub-band, and transmitting, by the transmitter 22, a frequency resource corresponding to the M first sub-bands; the M is a positive integer;
  • the sum of the second interference strengths received by the M first sub-bands is less than or equal to the second interference strength corresponding to any other M sub-bands other than the M first sub-bands in the system bandwidth. with.
  • the second interference strength of each of the N first subbands selected by the processor 21 is less than or equal to any other than the N first subbands.
  • the second interference strength of the frequency band is less than or equal to any other than the N first subbands.
  • the second interference strength of each of the M first subbands selected by the processor 21 is less than or equal to any other than the M first subbands.
  • the second interference strength of the frequency band is less than or equal to any other than the M first subbands.
  • the transmitter 22 is specifically configured to:
  • the channel reservation signal is a signal for indicating the at least one first sub-band selected by the user equipment in the system bandwidth; the data signal includes data information of the user equipment.
  • the transmitter 22 is specifically configured to:
  • the channel reservation signal is a signal for indicating the at least one first sub-band selected by the user equipment in the system bandwidth; the data signal includes data information of the user equipment.
  • the channel detection period includes at least one channel evaluation CCA time slot, and the first interference strength that is compared by the processor 21 is less than or equal to the first interference threshold, including: the channel detection period.
  • the first interference strength corresponding to each CCA time slot is less than or equal to the first interference threshold.
  • the processor 21 is specifically configured to:
  • N first sub-bands are selected from the system bandwidth according to a preset number of sub-bands occupied by each data packet and a second interference strength received by each sub-band within the system bandwidth.
  • the processor 21 is specifically configured to:
  • the M first sub-bands are selected from the system bandwidth according to a preset number of sub-bands occupied by each data packet and a second interference strength received by each sub-band within the system bandwidth.
  • the user equipment provided in this embodiment is used to perform the technical solution of the method embodiment shown in FIG. 1 to FIG. 6.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSPs), dedicated Application Specific Integrated Circuit (ASIC), etc.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes: read-only memory (ROM), RAM, flash memory, hard disk, solid state hard disk, and magnetic tape (English: Magnetic tape), floppy disk (English: floppy disk), optical disc (English: optical disc) and any combination thereof.

Abstract

本发明提供一种用户设备发送信号的方法和用户设备，该方法包括：在获取的信道检测周期内，检测系统带宽内的第一干扰强度和所述系统带宽内的每个子频带的第二干扰强度，并将第一干扰强度与第一干扰门限值进行比较，如果第一干扰强度小于所述第一干扰门限值，则根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择受到干扰较小的N个第一子频带，并在所述N个第一子频带上发送信号，通过考量整个带宽内的干扰和每个子频带的干扰，在整个系统干扰较小的时候，避免了传输碰撞，并且选择干扰小的子频带进行信号传输，进一步减小传输干扰，从而有效提高数据传输的可靠性。

Description

用户设备发送信号的方法和用户设备 技术领域
本发明实施例涉及通信技术，尤其涉及一种用户设备发送信号的方法和用户设备。
背景技术
设备到设备(Device to device，D2D)通信是指设备与设备之间直接进行的通信，一般分为D2D单播通信和D2D广播/组播通信，在D2D单播通信系统中，一个设备仅仅和另外一个设备直接进行通信。在D2D广播/组播通信系统中，一个设备会把自己的一个数据包同时发送给自己附近的多个设备。
无论是单播还是广播/组播通信，当没有基站或者控制器参与分配D2D通信的传输资源的时候，用户设备会自己选择自己的D2D通信传输资源，不同的用户设备容易选择到同样的时间频率资源来发送各自的D2D信号，而这些信号之间存在相互干扰，并且同一个用户设备不可能在同一个时间频率资源上既进行发送也进行接收，因此在两个设备选择了相同的时间频率资源发送D2D信号时，这两个设备无法接收到来自对方的D2D信号。另外，用户设备在系统带宽内一个子频带上发送信号的时候，不能同时在系统带宽内的其它子频带上接收来自其它设备的信号，因此当两个设备在系统带宽内不同的子频带上同时发送各自的D2D信号时候，这两个设备就无法接收来自对方的D2D信号。
综上所述，在D2D通信中由于不同的设备选择了相同的资源发送D2D信号相互造成干扰，或者在发送信号的时候不能接收其他频带上的信号，均会使D2D传输接收失败或者错误接收，导致D2D通信的可靠性低。
发明内容
本发明实施例提供一种用户设备发送信号的方法和用户设备，用于解决在D2D通信中由于不同的用户设备选择了相同的资源发送D2D信号相互造成干扰，或者在发送信号的时候不能接收其他频带上的信号，均会使D2D传 输接收失败或者错误接收，导致D2D通信的可靠性低的问题。
本发明第一方面提供一种用户设备发送信号的方法，包括：
用户设备确定信道检测周期；
所述用户设备在所述信道检测周期内，获取系统带宽内的第一干扰强度，并获取所述系统带宽内的每个子频带的第二干扰强度；所述第一干扰强度为所述系统带宽内的每个子频带的干扰强度的和；
所述用户设备将所述第一干扰强度与第一干扰门限值进行比较；
若所述第一干扰强度小于或等于所述第一干扰门限值，所述用户设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带，并在所述N个第一子频带对应的频率资源上发送信号；所述N为正整数；
其中，所述N个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述N个第一子频带之外的其他任意N个子频带所对应的第二干扰强度之和。
结合第一方面，在第一方面的第一种可能的实施方式中，所述方法还包括：
若所述第一干扰强度大于所述第一干扰门限值，所述用户设备判断传输资源申请时间是否达到预设的传输资源申请的最大时长；
若所述传输资源申请时间大于或等于所述最大时长，所述用户设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带，并在所述M个第一子频带对应的频率资源上发送信号；所述M为正整数；
其中，所述M个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述M个第一子频带之外的其他任意M个子频带所对应的第二干扰强度之和。
结合第一方面，在第一方面的第二种可能的实施方式中，所述N个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述N个第一子频带之外的其他任一子频带的第二干扰强度。
结合第一方面的第一种可能的实施方式，在第一方面的第三种可能的实施方式中，所述M个第一子频带中每个第一子频带的第二干扰强度小于或等 于除所述M个第一子频带之外的其他任一子频带的第二干扰强度。
结合第一方面、第一方面的第一至第三种中的任一种可能的实施方式，在第一方面的第四种可能的实施方式中，所述用户设备发送的信号包括信道保留信号和/或数据信号；
其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的子频带的信号；所述数据信号包括所述用户设备的数据信息。
结合第一方面的第四种可能的实施方式，在第一方面的第五种可能的实施方式中，所述用户设备发送的信号包括信道保留信号和数据信号，在所述N个第一子频带对应的频率资源上发送信号，包括：
在所述信道检测周期结束后，所述用户设备在所述N个第一子频带对应的频率资源上发送所述信道保留信号；
在发送完所述信道保留信号后，所述用户设备在所述N个第一子频带所对应的频率资源上发送所述数据信号。
结合第一方面的第四种可能的实施方式，在第一方面的第六种可能的实施方式中，所述用户设备发送的信号包括信道保留信号和数据信号，在所述M个第一子频带对应的频率资源上发送信号，包括：
在所述信道检测周期结束后，所述用户设备在所述M个第一子频带对应的频率资源上发送所述信道保留信号；
在发送完所述信道保留信号后，所述用户设备在所述M个第一子频带所对应的频率资源上发送所述数据信号。
结合第一方面、第一方面的第一至第六种中的任一种可能的实施方式，在第一方面的第七种可能的实施方式中，所述信道检测周期包括至少一个信道评估CCA时隙，则所述第一干扰强度小于或等于所述第一干扰门限值，包括：所述信道检测周期内每个CCA时隙对应的第一干扰强度均小于或等于所述第一干扰门限值。
结合第一方面或者第一方面的第二种可能的实施方式，在第一方面的第八种可能的实施方式中，所述用户设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带，包括：
所述用户设备根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；
或者，
所述用户设备根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带。
结合第一方面的第一种或者第一方面的第三种可能的实施方式，在第一方面的第九种可能的实施方式中，所述用户设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带，包括：
所述用户设备根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带；
或者，
所述用户设备根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带。
结合第一方面的第八种可能的实施方式，在第一方面的第十种可能的实施方式中，所述N个第一子频带是系统带宽内频率连续的N个子频带。
结合第一方面的第九种可能的实施方式，在第一方面的第十一种可能的实施方式中，所述M个第一子频带是系统带宽内频率连续的M个子频带。
本发明第二方面提供一种用户设备，包括：
获取模块，用于确定信道检测周期；
检测模块，用于在所述信道检测周期内，获取系统带宽内的第一干扰强度，并获取所述系统带宽内的每个子频带受到的第二干扰强度；所述第一干扰强度为所述系统带宽内的每个子频带的干扰强度的和；
处理模块，用于将所述第一干扰强度与第一干扰门限值进行比较；
若所述处理模块比较出所述第一干扰强度小于或等于所述第一干扰门限值，所述处理模块还用于根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；其中，所述N为正整数；所述N个第一子频带所受到的第二干扰强度之和小于或等于除所述N个第一子频带之外的其他任意N个子频带所对应的第二干扰强度之和；
发送模块，用于在所述N个第一子频带对应的频率资源上发送信号。
结合第二方面，在第二方面的第一种可能的实施方式中，所述处理模块 还用于：
若所述第一干扰强度大于所述第一干扰门限值，判断传输资源申请时间是否达到预设的传输资源申请的最大时长；
若所述处理模块判断出所述传输资源申请时间大于或等于所述最大时长，根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带，并通过所述发送模块在所述M个第一子频带对应的频率资源上发送信号；所述M为正整数；
其中，所述M个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述M个第一子频带之外的其他任意M个子频带所对应的第二干扰强度之和。
结合第二方面，在第二方面的第二种可能的实施方式中，所述处理模块选择的所述N个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述N个第一子频带之外的其他任一子频带的第二干扰强度。
结合第二方面的第一种可能的实施方式，在第二方面的第三种可能的实施方式中，所述处理模块选择的所述M个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述M个第一子频带之外的其他任一子频带的第二干扰强度。
结合第二方面或者第二方面的第二种实施方式，在第二方面的第四种可能的实施方式中，若所述发送模块发送的信号包括信道保留信号和数据信号，则所述发送模块具体用于：
在所述信道检测周期结束后，在所述N个第一子频带对应的频率资源上发送所述信道保留信号；
在发送完所述信道保留信号后，在所述N个第一子频带对应的频率资源上发送所述数据信号；
其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的所述至少一个第一子频带的信号；所述数据信号包括所述用户设备的数据信息。
结合第二方面的第一种或者第二方面的第三种实施方式，在第二方面的第五种可能的实施方式中，若所述发送模块发送的信号包括信道保留信号和数据信号，则所述发送模块具体用于：
在所述信道检测周期结束后，在所述M个第一子频带对应的频率资源上发送所述信道保留信号；
在发送完所述信道保留信号后，在所述M个第一子频带对应的频率资源上发送所述数据信号；
其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的所述至少一个第一子频带的信号；所述数据信号包括所述用户设备的数据信息。
结合第二方面、第二方面的第一种至第五种中的任一种实施方式，在第二方面的第六种可能的实施方式中，所述信道检测周期包括至少一个信道评估CCA时隙，则所述处理模块比较出的第一干扰强度小于或等于所述第一干扰门限值，包括：所述信道检测周期内每个CCA时隙对应的第一干扰强度均小于或等于所述第一干扰门限值。
结合第二方面或者第二方面的第一种可能的实施方式，在第二方面的第七种可能实施方式中，所述处理模块具体用于：
根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；
或者，
根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带。
结合第二方面的第一种或者第二方面的第三种可能的实施方式，在第二方面的第八种可能实施方式中，所述处理模块具体用于：
根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带；
或者，
根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带。
本发明第三方面提供一种用户设备，包括：处理器和发送器；
所述处理器用于：
确定信道检测周期；
在所述信道检测周期内，获取系统带宽内的第一干扰强度，并获取所述 系统带宽内的每个子频带受到的第二干扰强度；所述第一干扰强度为所述系统带宽内的每个子频带的干扰强度的和；
将所述第一干扰强度与第一干扰门限值进行比较；
若所述处理器比较出所述第一干扰强度小于或等于所述第一干扰门限值，根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；其中，所述N为正整数；所述N个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述N个第一子频带之外的其他任意N个子频带所对应的第二干扰强度之和；
所述发送器用于在所述N个第一子频带对应的频率资源上发送信号。
本发明提供的用户设备发送信号的方法和用户设备，用户设备通过在获取的信道检测周期内，检测系统带宽内的第一干扰强度和所述系统带宽内的每个子频带的第二干扰强度，并将第一干扰强度与第一干扰门限值进行比较，如果第一干扰强度小于所述第一干扰门限值，则根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择受到干扰较小的N个第一子频带，并在所述N个第一子频带上发送信号，即通过考量整个带宽内的干扰和每个子频带的干扰，在整个系统干扰较小的时候，表示临近的用户设备没有发送信号的，避免了传输碰撞，即避免邻近的设备同时在不同的子频带上进行信号传输，并且选择干扰小的子频带进行信号传输，即对该些子频带产生干扰的其他设备距离比较远，进一步减小传输干扰，从而有效提高数据传输的可靠性。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图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性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明通信场景示意图；
图2为本发明用户设备发送信号的方法实施例一的流程图；
图3为本发明用户设备发送信号的方法实施例二的流程图；
图4为本发明用户设备发送信号的方法实施例三的流程图；
图5为本发明用户设备发送信号的方法一种子帧内的划分示意图；
图6为本发明用户设备发送信号的方法一实例的流程示意图；
图7为本发明用户设备实施例一的结构示意图；
图8为本发明用户设备实施例三的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，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，所描述的实施例是本发明一部分实施例，而不是全部的实施例。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前提下所获得的所有其他实施例，都属于本发明保护的范围。
图1为本发明通信场景示意图，本发明的方案可以应用于设备之间向其他设备发送信号或者接收其他设备发送的信号，通信场景至少包括两个设备，本发明中的设备是可以进行D2D通信或者其他有线无线通信的终端设备，也可以是其他网络设备，以下统称为用户设备。如图1所示，包括三个可进行D2D通信的手机，本发明中的设备不限于手机，还可以是平板电脑、智能终端、网络设备等，具体不作限制。
图2为本发明用户设备发送信号的方法实施例一的流程图，如图2所示，在图1所示的通信场景的基础上，该方案的执行主体为用户设备，设备需要发送信号之前要选择合适的发送资源，例如时域和频域的资源，该方案主要是涉及D2D通信的资源选择和发送的过程，该用户设备发送信号的方法的具体步骤包括：
S101：用户设备确定信道检测周期。
在本实施例中，信道检测周期可以是预先配置的，也可以是在协议中预先规定的，该信道检测周期表示检测一个信道所允许的最大时间长度，具体的时长可以随机选择或者根据当前的业务状态(如数据包的优先级)等选择一个信道检测周期。比如，如果当前的数据包的优先级高，那么该用户设备可以选择一个较短的信道检测周期。
S102：所述用户设备在所述信道检测周期内，获取系统带宽内的第一干扰强度，并获取所述系统带宽内的每个子频带的第二干扰强度。
在本实施例中，用户设备选择好信道检测周期后，在整个信道检测周期内检测整个系统带宽内的干扰信号，获取第一干扰强度，所述第一干扰强度用于表示所述系统带宽内的干扰信号的大小，该第一干扰强度可以是在系统带宽内，在信道检测周期内每个采样点的干扰信号强度的和，也可以是在系统带宽内，在信道检测周期内每个采样点的干扰信号强度的平均值，一般来说干扰信号强度可以是干扰信号的功率，也可是干扰信号的幅度，干扰信号强度可表示干扰大小即可，具体不做限制。
所述系统带宽可以是一个频分双工(Frequency division duplexing，FDD)系统的上行频带宽度或者下行频带宽度，或者一个时分双工(Time Division Duplexing，TDD)系统的频带宽度。
所述信道检测周期包括至少一个信道评估(Clear channel assessment，CCA)时隙，因此在信道检测周期内的每一个CCA时隙上进行采样，所有的采样点的干扰信号的功率平均值或者功率的和作为第一干扰强度。
检测所述系统带宽内的每个子频带受到的干扰，即第二干扰强度。获得每个子频带上的第二干扰强度的一种方式为：对接收信号进行频域变换，测量该子频带上的每一个子载波信号功率，该子频带上的所有子载波信号功率之和作为该子频带的干扰强度。
S103：所述用户设备将所述第一干扰强度与预先获取的第一干扰门限值进行比较。
在本实施例中，用户设备可以预先配置或者在协议中约定一个干扰信号强度的第一干扰门限值。如果获取的第一干扰强度为干扰信号强度之和，那么该第一干扰门限值的设置需要考虑系统带宽内的干扰信号强度之和进行设置，如果该第一干扰强度为干扰信号强度的平均值，那么该第一干扰门限值根据干扰信号强度的平均值来设置。实质上第一干扰门限值也可以是设备根据信道使用状况确定的，比如：若当前信道比较繁忙，则可以选择较小的干扰门限值等。这样可以增加一个用户设备获得发送资源的难度，从而降低由于多个设备发送信号而造成的相互干扰。所述第一干扰门限值也可以根据待发送的数据包的业务特点决定，比如：对传输时间延迟敏感的数据包可以使用较大的干扰门限值等。这样可以使得这些数据包较快的获得传输资源。
S104：若所述第一干扰强度小于或等于所述第一干扰门限值，所述用户 设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带，并在所述N个第一子频带上对应的频率资源上发送信号；所述N为正整数。
在本实施例中，所述信道检测周期包括多个CCA时隙，因此上述的第一干扰强度小于或等于所述第一干扰门限值，优选的，表示所述信道检测周期内每个CCA时隙对应的第一干扰强度均小于或等于所述干扰门限值。
如果检测出信道中的第一干扰强度小于所述干扰门限值，则意味着目前信道中传输的信号较少或者受到其他信号的干扰较小，为进一步保证传输的D2D信号的可靠性，需要根据每个子频带的第二干扰强度，在上述信道中选择干扰较小的一个或者多个(N个)第一子频带进行传输，选择出的所述N个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内允许所述设备使用的除所述N个第一子频带之外的其他任意N个子频带所对应的第二干扰强度之和。
具体的，至少包括以下两种情况：在选择出的N个第一子频带中，每一个第一子频带对应的第二干扰强度均小于或等于除所述N个第一子频带之外的其他任何一个子频带的第二干扰强度。
或者，所述N个第一子频带连续，且所述N个第一子频带受到的第二干扰强度之和小于系统带宽内允许所述设备使用的任何其他N个子频带上所受到的第二干扰强度之和。综上所述，主旨是将信道中干扰比较小的一些子频带选出来进行信号的发送。
本实施例提供的设备发送信号的方法，通过在预设的信道检测周期内，检测系统带宽内的第一干扰强度和所述系统带宽内的每个子频带受到的第二干扰强度，并将第一干扰强度与第一干扰门限值进行比较，如果第一干扰强度小于该第一干扰门限值，则根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择受到干扰较小的N个第一子频带发送信号，在整个系统干扰较小的时候发送信号，避免了传输碰撞，即避免邻近的设备同时在相同的子频带上进行信号传输，并且选择干扰小的子频带进行信号传输，其他的对选择出的子频带产生干扰的设备距离较远，进一步减小传输干扰，从而有效提高数据传输的可靠性。
图3为本发明用户设备发送信号的方法实施例二的流程图，如图3所示， 在上述图2所示的实施例基础上，在上述检测到系统带宽内的每个子频带的第二干扰强度之后，该用户设备发送信号的方法还包括：
S201：若所述第一干扰强度大于所述第一干扰门限值，所述用户设备判断传输资源申请时间是否达到预设的传输资源申请的最大时长。
在本实施例中，这里描述的“达到”表示等于或者大于，即要判断的是资源申请时间是否已经等于或者已经大于预设的最大时长。
S202：若所述传输资源申请时间大于或等于所述最大时长，所述用户设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带，并在所述M个第一子频带对应的频率资源上发送信号；所述M为正整数。
在本实施例中，在第一干扰强度大于干扰门限的时候，用户设备可以等待，并在下一个信道检测周期中继续检测，但是具体实现中，一般情况协议中规定了通信过程中传输资源申请的最大时长，用户设备不可能一直无休止的等待，因此这个时候就需要判断一下为本次通信申请传输资源的传输资源申请时间是否已经达到了协议规定或者预设的传输资源申请的最大时长，如果还没有到达允许的最大时长，则可以等待至下一个信道检测周期中继续检测，如果传输资源申请时间已经达到允许的最大时长，又或者在执行别的步骤的过程同时检测到为本次通信申请传输资源的传输资源申请时间已经达到最大时长了，则必须要进行本次通信了，即按照与实施例一相同的方式根据带宽内的每个子频带受到的第二干扰强度，从系统带宽内选择M个第一子频带进行信号的发送，该M个第一子频带的第二干扰强度之和小于或等于系统带宽内除所述M个第一子频带之外的其他任意M个子频带所对应的第二干扰强度之和。
具体的按照本实施例中从系统带宽内选择M个或者实施例一种从系统带宽内选择N个第一子频带的实现方式类似，至少以下两种：
一种实现方式为：上述用户设备(即发射侧设备)根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个(或者N个)第一子频带；
另一种实现方式为：设备(即发射侧设备)根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述 系统带宽内选择M个(或者N个)第一子频带。
例如：在单载波频分多址(Single carrier frequency division multiple Access，SC-FDMA)系统中，设备选择的N个第一子频带可以是频率连续的N(N为大于或等于1的正整数)个子频带，选择的N(N>＝1)个连续子频带上所受到的干扰要小于系统带宽内允许设备使用的任何其它的N个连续子频带上所受到的干扰。
在正交频分复用(Orthogonal Frequency Division Multiplex，OFDMA)系统中，设备选择的N个子频带可以是系统带宽内允许设备使用的所受干扰最小的N(N>＝1)个子频带。
在上述两个实施例中，选择干扰较小的子频带用作随后的D2D信号传输，可以使得随后的D2D数据传输受到较少的干扰，从而提高D2D数据传输的可靠性。
本实施例提供的设备发送信号的方法，通过在预先获取的信道检测周期内，检测系统带宽内的第一干扰强度和所述系统带宽内的每个子频带受到的第二干扰强度，在传输资源申请时间已经达到最大时长时，根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择受到干扰较小的至少一个第一子频带发送信号，通过选择干扰小的子频带进行信号传输，避免周围距离较近的其他设备的信号对本用户设备选择的子频带的干扰，减小传输干扰，从而有效提高数据传输的可靠性。
图4为本发明用户设备发送信号的方法实施例三的流程图，如图4所示，在上述图2或3所示的实施例基础上，在选择出的多个第一子频带上发送的所述信号包括信道保留信号和/或数据信号。所述信道保留信号为用于指示在所述系统带宽内选择的第一子频带的信号，至少指示终端设备在系统带宽内所选择的第一子频带和/或该终端设备数据传输所占用的子频带。所述数据信号包括所述设备的数据信息，比如数据包等。以实施例一中选择N个第一子频带为例，在所述N个第一子频带上发送信号的一种具体步骤为：
S301：在所述信道检测周期结束后，所述用户设备在所述N个第一子频带对应的频率资源上发送所述信道保留信号。
在本实施例中，信道保留信号包含一个或者多个OFDM或者SC-FDMA符号，并且在信道检测周期结束后，仅仅在设备所选择的第一子频带对应的 频率资源上传输该信道保留信号。信道保留信号中的一个OFDM符号或者SC-FDMA符号的长度可以等于一个CCA时隙的长度。所述信道保留信号在该设备的信道检测周期结束后进行发送，并且一直持续到一个系统配置的或者协议约定的时刻。比如，这个协议约定的时刻可以是某子帧的第三个SC-FDMA符号的结束时刻。
S302：在发送完所述信道保留信号后，所述用户设备在所述N个第一子频带对应的频率资源上上发送所述数据信号。
在本实施例中，用户设备在发送完它的信道保留信号后，会继续在该用户设备所选择的子频带上发送它的数据信号。
在上述的几个实施例中，如果终端设备在信道检测周期内检测到整个系统带宽内的干扰强度小于一个门限值，或者，如果该终端设备满足了其它的信号发送条件，该终端设备会发送自身的信道保留信号和/或数据信号。所述的‘其它信号发送条件’可以是数据包所对应的传输资源申请时间已经达到了系统所允许的最大值，数据包的传输资源申请时间可以定义为从一个数据包开始进行传输资源申请或信道检测到当前时刻所经历的时间。也可以是其他配置的符合发送信号的条件，具体不做限制。
若该所述信号为D2D信号，则D2D信号包括D2D信道保留信号和/或D2D数据信号。其发送方式与上述相同，即在在信道检测周期结束后，在选择的第一子频带上发送D2D信道保留信号，发送完成后再发送D2D数据信号。
同样的，在实施例二中的在M个第一子频带对应的频率资源上发送信号包括：
在所述信道检测周期结束后，所述用户设备在所述M个第一子频带对应的频率资源上发送所述信道保留信号；
在发送完所述信道保留信号后，所述用户设备在所述M个第一子频带所对应的频率资源上发送所述数据信号。
优选的，选择出的该M个第一子频带是系统带宽内频率连续的M个子频带。
在上述图2至图4所示的实施例的基础上，下面以D2D通信为例，说明本发明提供的设备发送信号的方法的具体实现过程：
图5为本发明用户设备发送信号的方法一种子帧内的划分示意图，如图5所示，D2D信道检测和D2D数据传输都是在一个子帧内完成。这个子帧可以是一个LTE的子帧。在一个子帧的开始，终端设备会选择一个信道检测周期并进行第一干扰强度的检测。若在整个信道检测周期系统带宽内的干扰都低于一个门限值，或者，如果满足了其它的D2D信号发送条件，该设备会选择干扰较小的第一子频带，并且在所述信道检测周期结束后在这些子频带对应的频率资源上发送D2D信道保留信号和/或D2D数据信号。另外，D2D保护间隔被放在了D2D数据信号的后面，可以提供该终端设备从发射到接收或者接收到发送的硬件转换时间。
图6为本发明设备发送信号的方法一实例的流程示意图，如图6所示，实际应用中，终端设备的设备发送信号的方法的具体步骤为：
S401：选择信道检测周期，该信道检测周期包括I个CCA时隙，I为大于或等于1的正整数。
在本实例中，如图5所示的子帧划分示意图，从一个子帧中选择的信道检测周期可以包含I(I>＝1)个CCA时隙。一个CCA时隙的长度可以是几微秒，比如9微秒。系统可以配置或者协议预先规定一个信道检测周期的最大允许时间长度。
S402：在第i个CCA时隙中，检测系统带宽内的第一干扰强度是否大于第一干扰门限值。
如果第i个CCA时隙的系统带宽内的第一干扰强度大于第一干扰门限值，则执行步骤S403，否则执行步骤S404。首先该i的初始值是1，即从一个信道检测周期的第一个CCA时隙开始取样检测系统带宽内的干扰信号，计算干扰信号的强度的均值或者和作为第一干扰强度。
在本实例中，在此之前需要检测得到该系统带宽内的第一干扰强度和该系统带宽的每个子频带上的第二干扰强度，终端设备在所选择的信道检测周期的每一个CCA时隙内，检测整个系统带宽内的干扰大小。一种具体实现方式为：将一个CCA时隙内所有采样点的功率进行累加并平均得到该CCA时隙内样点的平均功率，并该平均功率作为该CCA时隙的整个系统带宽的第一干扰强度。
终端设备可以将一个CCA时隙内得到的整个系统带宽内的第一干扰强度 和干扰门限值进行比较。该’干扰门限值’可以是系统配置的或者协议约定或者该设备根据数据包业务特点自己决定。比如：对传输时间延迟敏感的数据包可以使用较小的门限值等。
S403：在第i＝i+1个CCA时隙中，检测系统带宽内的第一干扰强度是否大于第一干扰门限值。
在本实施例中，本步骤为步骤S402的循环步骤，在i的值增加1的时候重复执行，因此附图中采用相同的描述，如果第i+1个CCA时隙的系统带宽内的第一干扰强度小于第一干扰门限值，则检测第i+2个CCA时隙中，重复执行本步骤，当信道检测周期内的M个CCA时隙内的第一干扰强度均小于第一干扰门限值，则执行S405，如果存在CCA时隙内的第一干扰强度大于第一干扰门限值，则执行S404。实质上该步骤S403为同一个步骤，只是给i的值加1，具体流程参考附图。
S404：判断传输资源申请时间是否达到预设的传输资源申请的最大时长。
在本实例中，如果传输资源申请时间没达到规定的最大时长，则等待下一个信道检测周期继续按照步骤S401-S404的方式进行检测，直至传输资源申请时间达到规定的最大时长或者全部CCA时隙的第一干扰强度均小于干扰门限值时，执行步骤S405。
S405：从所述系统带宽内选择至少一个第一子频带。
在本实施例中，终端设备选择第一子频带根据的是该系统带宽的每个子频带上的第二干扰强度，一般情况下选择受到干扰比较小的子频带。
S406：在所述至少一个第一子频带上对应的频率资源上发送D2D信号。
在本实例中，终端设备设备测量整个系统带宽内每一个子频带上所受到第二干扰强度，且都小于或者等于干扰门限值或者满足其他发送条件后，终端设备根据自己所要传输的数据包大小选择1个或者多个第一子频带，或者系统约定好一个数据包所占用的子频带个数选择1个或者多个第一子频带。
在SC-FDMA系统中，终端设备选择的子频带可以是频率连续的N(N>＝1)个子频带。一个选择N(N为大于或等于1的正整数)个连续子频带的方法是：所选择的N(N>＝1)个连续子频带上所受到的干扰之和要小于系统带宽内允许设备使用的任何其它N个连续子频带上所受到的干扰之和。在OFDMA系统中，终端设备选择的子频带可以是所受干扰最小的N(N>＝1)个子频带。获得一个 子频带上的第二干扰强度的方法是：对接收信号进行频域变换，测量相应子频带上的每一个子载波信号功率，该子频带上的所有子载波信号功率之和作为该子频带的第二干扰强度。
如果该D2D信号包括信道保留信合和D2D数据信号时，如图5所示，在发送信号时，在信道检测周期过后，首先发送信道保留信号，在信道保留信号发送完成后，在发送D2D数据信号，发送完数据信号后留一段保护间隔，以供硬件的转换。
本实施例提供的设备发送信号的方法，通过测量整个系统带宽内的干扰大小，当整个系统带宽内的干扰小于门限值的时候，进行D2D数据信号传输。这样可以克服半双工问题，也就是避免邻近的设备同时在不同的子频带上进行D2D数据信号传输，进一步通过选择干扰较小的子频带并在这些子频带上进行D2D数据信号传输，这样可以减少D2D传输所受到的干扰，从而提高D2D数据传输的可靠性。
另外，本发明通过引入信道保留信号，指示一个设备所选择的子频带以及该设备随后数据传输所占用的子频带，从而可以帮助其他设备进行信道检测，选择干扰较小的子频带用作随后的D2D数据信号传输，可以使得随后的D2D数据传输受到较少的干扰，从而更有效的提高D2D数据传输的可靠性。
图7为本发明用户设备实施例一的结构示意图，如图7所示，该用户设备10包括：获取模块11、检测模块12，处理模块13和发送模块14。
获取模块11，用于确定信道检测周期；
检测模块12，用于在所述信道检测周期内，获取系统带宽内的第一干扰强度，并获取所述系统带宽内的每个子频带受到的第二干扰强度；所述第一干扰强度为所述系统带宽内的每个子频带的干扰强度的和；
处理模块13，用于将所述第一干扰强度与第一干扰门限值进行比较；
若所述处理模块13比较出所述第一干扰强度小于或等于所述第一干扰门限值，所述处理模块13还用于根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；其中，所述N为正整数；所述N个第一子频带所受到的第二干扰强度之和小于或等于除所述N个第一子频带之外的其他任意N个子频带所对应的第二干扰强度之和；
发送模块14，用于在所述N个第一子频带对应的频率资源上发送信号。
本实施例提供的用户设备，用于执行图1至图6任一所示的方法实施例的技术方案，其实现原理和技术效果类似，通过检测系统带宽内的干扰信号，得到第一干扰强度与设置的第一干扰门限值比较，在系统带宽内的第一干扰强度小于第一干扰门限值时，即系统带宽内干扰较小，临近该用户设备的周围没有设备发送信号，再根据系统带宽内的每个子频带的第二干扰强度，选择第二干扰强度较小的子频带发送信号，进一步减小传输干扰，从而提高数据传输的可靠性。
在本发明用户设备的实施例二中，在上述实施例一的基础上，所述处理模块13还用于：
若所述第一干扰强度大于所述第一干扰门限值，判断传输资源申请时间是否达到预设的传输资源申请的最大时长；
若所述处理模13块判断出所述传输资源申请时间大于或等于所述最大时长，根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带，并通过所述发送模块14在所述M个第一子频带对应的频率资源上发送信号；所述M为正整数；
其中，所述M个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述M个第一子频带之外的其他任意M个子频带所对应的第二干扰强度之和。
可选的，所述处理模块13选择的所述N个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述N个第一子频带之外的其他任一子频带的第二干扰强度。
可选的，所述处理模块13选择的所述M个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述M个第一子频带之外的其他任一子频带的第二干扰强度。
可选的，若所述发送模块14发送的信号包括信道保留信号和数据信号，则所述发送模块14具体用于：
在所述信道检测周期结束后，在所述N个第一子频带对应的频率资源上发送所述信道保留信号；
在发送完所述信道保留信号后，在所述N个第一子频带对应的频率资源上发送所述数据信号；
其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的所述至少一个第一子频带的信号；所述数据信号包括所述用户设备的数据信息。
可选的，若所述发送模块14发送的信号包括信道保留信号和数据信号，则所述发送模块14具体用于：
在所述信道检测周期结束后，在所述M个第一子频带对应的频率资源上发送所述信道保留信号；
在发送完所述信道保留信号后，在所述M个第一子频带对应的频率资源上发送所述数据信号；
其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的所述至少一个第一子频带的信号；所述数据信号包括所述用户设备的数据信息。
可选的，所述信道检测周期包括至少一个信道评估CCA时隙，则所述处理模块13比较出的第一干扰强度小于或等于所述第一干扰门限值，包括：所述信道检测周期内每个CCA时隙对应的第一干扰强度均小于或等于所述第一干扰门限值。
可选的，所述处理模块13具体用于：
根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；
或者，
根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带。
可选的，所述处理模块13具体用于：
根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带；
或者，
根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带。
本实施例提供的用户设备，用于执行图1至图6所示的方法实施例的技术方案，其实现原理和技术效果类似，在此不再赘述。
图8为本发明用户设备实施例三的结构示意图，如图8所示，该用户设备20包括：处理器21和发送器22；
所述处理器21用于：确定信道检测周期；在所述信道检测周期内，获取系统带宽内的第一干扰强度，并获取所述系统带宽内的每个子频带受到的第二干扰强度；所述第一干扰强度为所述系统带宽内的每个子频带的干扰强度的和；将所述第一干扰强度与第一干扰门限值进行比较；
若所述处理器21比较出所述第一干扰强度小于或等于所述第一干扰门限值，根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；其中，所述N为正整数；所述N个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述N个第一子频带之外的其他任意N个子频带所对应的第二干扰强度之和；
所述发送器22用于在所述N个第一子频带对应的频率资源上发送信号。
在本发明用户设备的实施例二中，在上述实施例一的基础上，所述处理器21还用于：
若所述第一干扰强度大于所述第一干扰门限值，判断传输资源申请时间是否达到预设的传输资源申请的最大时长；
若所述处器21块判断出所述传输资源申请时间大于或等于所述最大时长，根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带，并通过所述发送器22在所述M个第一子频带对应的频率资源上发送信号；所述M为正整数；
其中，所述M个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述M个第一子频带之外的其他任意M个子频带所对应的第二干扰强度之和。
可选的，所述处理器21选择的所述N个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述N个第一子频带之外的其他任一子频带的第二干扰强度。
可选的，所述处理器21选择的所述M个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述M个第一子频带之外的其他任一子频带的第二干扰强度。
可选的，若所述发送器22发送的信号包括信道保留信号和数据信号，则 所述发送器22具体用于：
在所述信道检测周期结束后，在所述N个第一子频带对应的频率资源上发送所述信道保留信号；
在发送完所述信道保留信号后，在所述N个第一子频带对应的频率资源上发送所述数据信号；
其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的所述至少一个第一子频带的信号；所述数据信号包括所述用户设备的数据信息。
可选的，若所述发送器22发送的信号包括信道保留信号和数据信号，则所述发送器22具体用于：
在所述信道检测周期结束后，在所述M个第一子频带对应的频率资源上发送所述信道保留信号；
在发送完所述信道保留信号后，在所述M个第一子频带对应的频率资源上发送所述数据信号；
其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的所述至少一个第一子频带的信号；所述数据信号包括所述用户设备的数据信息。
可选的，所述信道检测周期包括至少一个信道评估CCA时隙，则所述处理器21比较出的第一干扰强度小于或等于所述第一干扰门限值，包括：所述信道检测周期内每个CCA时隙对应的第一干扰强度均小于或等于所述第一干扰门限值。
可选的，所述处理器21具体用于：
根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；
或者，
根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带。
可选的，所述处理器21具体用于：
根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带；
或者，
根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带。
本实施例提供的用户设备，用于执行图1至图6所示的方法实施例的技术方案，其实现原理和技术效果类似，在此不再赘述。
在上述用户设备的实体实施例中，应理解，该处理器可以是中央处理单元(Central Processing Unit，CPU)，还可以是其他通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本发明实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：只读存储器(read-only memory，ROM)、RAM、快闪存储器、硬盘、固态硬盘、磁带(英文：magnetic tape)、软盘(英文：floppy disk)、光盘(英文：optical disc)及其任意组合。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (22)

  1. 一种用户设备发送信号的方法，其特征在于，包括：
    用户设备确定信道检测周期；
    所述用户设备在所述信道检测周期内，获取系统带宽内的第一干扰强度，并获取所述系统带宽内的每个子频带的第二干扰强度；所述第一干扰强度用于表示所述系统带宽内的干扰信号的大小；
    所述用户设备将所述第一干扰强度与第一干扰门限值进行比较；
    若所述第一干扰强度小于或等于所述第一干扰门限值，所述用户设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带，并在所述N个第一子频带对应的频率资源上发送信号；所述N为正整数；
    其中，所述N个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述N个第一子频带之外的其他任意N个子频带所对应的第二干扰强度之和。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    若所述第一干扰强度大于所述第一干扰门限值，所述用户设备判断传输资源申请时间是否达到预设的传输资源申请的最大时长；
    若所述传输资源申请时间大于或等于所述最大时长，所述用户设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带，并在所述M个第一子频带对应的频率资源上发送信号；所述M为正整数；
    其中，所述M个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述M个第一子频带之外的其他任意M个子频带所对应的第二干扰强度之和。
  3. 根据权利要求1所述的方法，其特征在于，所述N个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述N个第一子频带之外的其他任一子频带的第二干扰强度。
  4. 根据权利要求2所述的方法，其特征在于，所述M个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述M个第一子频带之外的其他任一子频带的第二干扰强度。
  5. 根据权利要求1至4任一项所述的方法，其特征在于，所述用户设备发送的信号包括信道保留信号和/或数据信号；
    其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的子频带的信号；所述数据信号包括所述用户设备的数据信息。
  6. 根据权利要求5所述的方法，其特征在于，所述用户设备发送的信号包括信道保留信号和数据信号，在所述N个第一子频带对应的频率资源上发送信号，包括：
    在所述信道检测周期结束后，所述用户设备在所述N个第一子频带对应的频率资源上发送所述信道保留信号；
    在发送完所述信道保留信号后，所述用户设备在所述N个第一子频带所对应的频率资源上发送所述数据信号。
  7. 根据权利要求5所述的方法，其特征在于，所述用户设备发送的信号包括信道保留信号和数据信号，在所述M个第一子频带对应的频率资源上发送信号，包括：
    在所述信道检测周期结束后，所述用户设备在所述M个第一子频带对应的频率资源上发送所述信道保留信号；
    在发送完所述信道保留信号后，所述用户设备在所述M个第一子频带所对应的频率资源上发送所述数据信号。
  8. 根据权利要求1至7任一项所述的方法，其特征在于，所述信道检测周期包括至少一个信道评估CCA时隙，则所述第一干扰强度小于或等于所述第一干扰门限值，包括：所述信道检测周期内每个CCA时隙对应的第一干扰强度均小于或等于所述第一干扰门限值。
  9. 根据权利要求1或3所述的方法，其特征在于，所述用户设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带，包括：
    所述用户设备根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；
    或者，
    所述用户设备根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频 带。
  10. 根据权利要求2或4所述的方法，其特征在于，所述用户设备根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带，包括：
    所述用户设备根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带；
    或者，
    所述用户设备根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带。
  11. 根据权利要求9所述的方法，其特征在于，所述N个第一子频带是系统带宽内频率连续的N个子频带。
  12. 根据权利要求10所述的方法，其特征在于，所述M个第一子频带是系统带宽内频率连续的M个子频带。
  13. 一种用户设备，其特征在于，包括：
    获取模块，用于确定信道检测周期；
    检测模块，用于在所述信道检测周期内，获取系统带宽内的第一干扰强度，并获取所述系统带宽内的每个子频带受到的第二干扰强度；所述第一干扰强度为所述系统带宽内的每个子频带的干扰强度的和；
    处理模块，用于将所述第一干扰强度与第一干扰门限值进行比较；
    若所述处理模块比较出所述第一干扰强度小于或等于所述第一干扰门限值，所述处理模块还用于根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；其中，所述N为正整数；所述N个第一子频带所受到的第二干扰强度之和小于或等于除所述N个第一子频带之外的其他任意N个子频带所对应的第二干扰强度之和；
    发送模块，用于在所述N个第一子频带对应的频率资源上发送信号。
  14. 根据权利要求13所述的用户设备，其特征在于，所述处理模块还用于：
    若所述第一干扰强度大于所述第一干扰门限值，判断传输资源申请时间是否达到预设的传输资源申请的最大时长；
    若所述处理模块判断出所述传输资源申请时间大于或等于所述最大时长，根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带，并通过所述发送模块在所述M个第一子频带对应的频率资源上发送信号；所述M为正整数；
    其中，所述M个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述M个第一子频带之外的其他任意M个子频带所对应的第二干扰强度之和。
  15. 根据权利要求13所述的用户设备，其特征在于，所述处理模块选择的所述N个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述N个第一子频带之外的其他任一子频带的第二干扰强度。
  16. 根据权利要求14所述的用户设备，其特征在于，所述处理模块选择的所述M个第一子频带中每个第一子频带的第二干扰强度小于或等于除所述M个第一子频带之外的其他任一子频带的第二干扰强度。
  17. 根据权利要求13或15所述的用户设备，其特征在于，若所述发送模块发送的信号包括信道保留信号和数据信号，则所述发送模块具体用于：
    在所述信道检测周期结束后，在所述N个第一子频带对应的频率资源上发送所述信道保留信号；
    在发送完所述信道保留信号后，在所述N个第一子频带对应的频率资源上发送所述数据信号；
    其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的所述至少一个第一子频带的信号；所述数据信号包括所述用户设备的数据信息。
  18. 根据权利要求14或16所述的用户设备，其特征在于，若所述发送模块发送的信号包括信道保留信号和数据信号，则所述发送模块具体用于：
    在所述信道检测周期结束后，在所述M个第一子频带对应的频率资源上发送所述信道保留信号；
    在发送完所述信道保留信号后，在所述M个第一子频带对应的频率资源上发送所述数据信号；
    其中，所述信道保留信号为用于指示所述用户设备在所述系统带宽内选择的所述至少一个第一子频带的信号；所述数据信号包括所述用户设备的数 据信息。
  19. 根据权利要求13至18任一项所述的用户设备，其特征在于，所述信道检测周期包括至少一个信道评估CCA时隙，则所述处理模块比较出的第一干扰强度小于或等于所述第一干扰门限值，包括：所述信道检测周期内每个CCA时隙对应的第一干扰强度均小于或等于所述第一干扰门限值。
  20. 根据权利要求13或15所述的用户设备，其特征在于，所述处理模块具体用于：
    根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；
    或者，
    根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带。
  21. 根据权利要求14或16所述的用户设备，其特征在于，所述处理模块具体用于：
    根据待发送的数据包的大小和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带；
    或者，
    根据预设的每个数据包占用的子频带个数和所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择M个第一子频带。
  22. 一种用户设备，其特征在于，包括：处理器和发送器；
    所述处理器用于：
    确定信道检测周期；
    在所述信道检测周期内，获取系统带宽内的第一干扰强度，并获取所述系统带宽内的每个子频带受到的第二干扰强度；所述第一干扰强度为所述系统带宽内的每个子频带的干扰强度的和；
    将所述第一干扰强度与第一干扰门限值进行比较；
    若所述处理器比较出所述第一干扰强度小于或等于所述第一干扰门限值，根据所述系统带宽内的每个子频带受到的第二干扰强度，从所述系统带宽内选择N个第一子频带；其中，所述N为正整数；所述N个第一子频带所受到的第二干扰强度之和小于或等于系统带宽内除所述N个第一子频带之外 的其他任意N个子频带所对应的第二干扰强度之和；
    所述发送器用于在所述N个第一子频带对应的频率资源上发送信号。
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