WO2016082292A1 - 信道检测方法及系统、具有基站功能的设备和终端 - Google Patents

信道检测方法及系统、具有基站功能的设备和终端 Download PDF

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Publication number
WO2016082292A1
WO2016082292A1 PCT/CN2014/096024 CN2014096024W WO2016082292A1 WO 2016082292 A1 WO2016082292 A1 WO 2016082292A1 CN 2014096024 W CN2014096024 W CN 2014096024W WO 2016082292 A1 WO2016082292 A1 WO 2016082292A1
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Prior art keywords
frequency band
channel
unlicensed
frequency bands
lte system
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PCT/CN2014/096024
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English (en)
French (fr)
Inventor
李明菊
朱亚军
雷艺学
张云飞
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Dongguan Yulong Telecommunication Technology Co Ltd
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Dongguan Yulong Telecommunication Technology Co Ltd
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Priority to EP14906800.9A priority Critical patent/EP3226445B1/en
Publication of WO2016082292A1 publication Critical patent/WO2016082292A1/zh
Priority to US15/444,338 priority patent/US10375579B2/en
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    • 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
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0042—Intra-user or intra-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • 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]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a channel detection method when an LTE system operates in an unlicensed frequency band, a channel detection system when an LTE system operates in an unlicensed frequency band, a device with a base station function, and A terminal.
  • 3GPP is discussing how to use unlicensed spectrum, such as the 2.4 GHz and 5 GHz bands, with the help of licensed spectrum.
  • unlicensed spectrum are currently mainly used in systems such as Wi-Fi, Bluetooth, radar, and medical.
  • LAA LTE Assisted Access
  • TDD mode TDD mode
  • LTE systems operating in unlicensed bands have the ability to provide higher spectral efficiency and greater coverage, while relying on the same core network to allow data traffic between licensed and unlicensed bands. Sew switch. For the user, this means a better broadband experience, higher speed, better stability and mobility.
  • Wi-Fi Wireless Fidelity
  • CSMA/CD Carrier Sense Multiple Access/Collision Detection
  • the basic principle of this method is Wi-Fi. Before the AP (Access Point) or the terminal sends signaling or data, it must first monitor whether other APs or other terminals are transmitting/receiving signaling or data. If so, continue to listen until it is monitored. If not, a random number is generated as the backoff time. If no signaling or data transmission is detected during this backoff time, the AP or the terminal may start transmitting signaling or data after the end of the backoff time. The process is shown in Figure 1.
  • the LTE network has good orthogonality to ensure the interference level, the uplink and downlink transmissions between the base station and the user do not need to consider whether other base stations or other users are transmitting data. If LTE is used on an unlicensed band, it does not consider whether other devices are using unlicensed bands nearby, which will cause great interference to Wi-Fi devices. Because LTE transmits as long as there is traffic, there is no monitoring rule, then the Wi-Fi device cannot transmit when LTE has service transmission, and can only detect the channel idle state for data transmission after the LTE service transmission is completed.
  • the LBT mechanism similar to Wi-Fi is based on broadband detection, that is, directly detecting the channel state in the entire larger frequency band to determine whether the entire frequency band is available. Therefore, the disadvantage is that the spectrum utilization is not flexible enough to cause the spectrum. Low utilization. Specifically, if the LAA system of the operator A detects that the LBT channel is idle, the unlicensed frequency band is occupied, but in fact, the LAA cell may only occupy some of the RBs (Resource Blocks), and other RBs are Not occupied, and is in an idle state.
  • RBs Resource Blocks
  • the LAA system of the operator B When the LAA system of the operator B detects the LBT channel state, the LAA system of the operator A uses some resources, which may cause the LAA system of the operator B to detect that the channel is busy, and thus cannot transmit data, but actually has a part. RB is not used at all, in which case it will cause a problem of reduced spectrum utilization.
  • the present invention is based on at least one of the above technical problems, and proposes a channel detection scheme when a new LTE system operates in an unlicensed frequency band, so that when the LTE system works in an unlicensed frequency band, a wider unlicensed frequency band can be used. It is divided into multiple narrowbands to determine the busy state of the channel in each narrowband and improve the spectrum utilization rate. The detection of the busy state of the channel also ensures that the LTE system works normally in the unlicensed band. Under the premise, avoid the LTE system from causing large interference to other systems when working in the unlicensed band.
  • a channel detecting method for an LTE system applicable to a device having a base station function when operating in an unlicensed frequency band including: dividing the unlicensed frequency band into multiple frequency bands Setting a determination threshold corresponding to each of the plurality of frequency bands for detecting a channel busy state in each of the frequency bands; setting in the frame structure of the LTE system for detecting each of the frequency bands a downlink channel state and/or a channel monitoring subframe of an uplink channel state, and detecting a busy state of the downlink channel and/or the uplink channel in each of the frequency bands according to the determination threshold corresponding to each of the frequency bands .
  • the unlicensed frequency band is wide, the unlicensed frequency band is divided into a plurality of frequency bands, and a determination threshold corresponding to each frequency band for detecting the busy state of the channel is set, so as to correspond to each frequency band.
  • the threshold value is used to detect the busy state of the uplink channel and/or the downlink channel in each frequency band, so that when the LTE system works in the unlicensed frequency band, the wider unlicensed frequency band can be divided into multiple narrow bands (ie, multiple The frequency band), in turn, can determine the busy state of the uplink channel and/or the downlink channel in each narrowband separately, improve the spectrum utilization, avoid occupying only a part of the RBs of the unlicensed frequency band, and cause other systems to detect that the channel is busy.
  • the inability to transfer data results in a lower frequency utilization.
  • the corresponding interference avoidance mechanism can be adopted, that is, the uplink channel and/or the downlink channel can be used.
  • the channel is detected Transmitting data when idle (that is, transmitting downlink data when detecting downlink channel idle, notifying terminal transmitting uplink data when detecting uplink channel idle), and not transmitting data when detecting that the channel is busy (that is, detecting downlink channel busy)
  • the terminal is notified not to transmit the uplink data, so that the LTE system can work with other systems working in the unlicensed band (such as Wi-Fi system) when working in the unlicensed band.
  • Peaceful coexistence in order to ensure that the LTE system can work normally in the unlicensed band, avoiding the LTE system operating in the unlicensed band, because there is no interference avoidance mechanism, it will cause greater interference to other systems with interference avoidance mechanism.
  • the channel monitoring subframe can detect the status of the downlink channel and/or the uplink channel in the following two manners: mode 1: periodically detecting, and mode 2: detecting only when downlink data and/or uplink data need to be transmitted.
  • the above downlink data includes both normal interaction data and control signaling.
  • the device with base station function described in the present invention includes a macro base station and a micro cell base station implemented by a communication device (such as a smart phone or the like).
  • the determination threshold corresponding to each frequency band is set according to a bandwidth of each frequency band and/or a signal type that each of the frequency bands needs to transmit.
  • the determination threshold may be set lower to make it easier for other systems to detect such a frequency band.
  • the inner channel is busy; for a wider frequency band, a larger judgment threshold can be appropriately selected, and for a narrower frequency band, a smaller judgment threshold can be appropriately selected.
  • the determination threshold corresponding to a frequency band for transmitting a synchronization signal in the plurality of frequency bands is smaller than the determination threshold corresponding to another frequency band of the plurality of frequency bands.
  • the step of dividing the unlicensed frequency band into multiple frequency bands is specifically: dividing the unlicensed frequency band into the plurality of frequency bands equally; or arbitrarily dividing the unlicensed frequency band into The plurality of frequency bands.
  • an unlicensed frequency band of 20 MHz it may be divided into four 5 MHz frequency bands by means of averaging, or may be divided into frequency bands of 5 MHz, 4.3 MHz, 1.4 MHz, 4.3 MHz, and 5 MHz by any division.
  • the method further includes: notifying the terminal to measure channel quality in a specified frequency band of the plurality of frequency bands, and feeding back channel quality measurement information of the specified frequency band.
  • the terminal may be notified to detect the channel quality information of the idle channel in the frequency band and report the channel quality, and then according to the channel quality reported by the terminal.
  • the information selects the appropriate channel to transmit the downlink data.
  • a detection time and/or a detection period of a channel monitoring subframe for detecting a downlink channel state and/or an uplink channel state in any one of the plurality of frequency bands is used for detecting other
  • the detection time and/or the detection period of the channel listening subframe in the downlink channel state and/or the uplink channel state in the frequency band are the same or different.
  • the method further includes: notifying the bandwidth of the unlicensed frequency band, the bandwidth of each frequency band, and the determining threshold corresponding to each frequency band to the terminal, where the terminal is configured according to the terminal.
  • the determination threshold corresponding to each frequency band detects a busy state of an uplink channel in each frequency band.
  • a channel detection method for an LTE system in a non-licensed frequency band includes: receiving a bandwidth of the unlicensed frequency band sent by a device having a base station function, and a bandwidth of each frequency band when the unlicensed frequency band is divided into a plurality of frequency bands and a determination threshold corresponding to each of the frequency bands for detecting a channel busy state in each of the frequency bands; in a frame structure of the LTE system And a channel monitoring subframe for detecting an uplink channel state in each frequency band, and detecting a busy state of the uplink channel in each frequency band according to the determination threshold corresponding to each frequency band.
  • the unlicensed frequency band is wide, the bandwidth of the unlicensed frequency band transmitted by the device receiving the function of the base station, the bandwidth of each frequency band when the unlicensed frequency band is divided into multiple frequency bands, and the corresponding frequency of each frequency band
  • the threshold value is determined, so that when the LTE terminal operates in the unlicensed frequency band, the device having the base station function can separately determine the busy state of the uplink channels of the plurality of narrowband (ie, multiple frequency bands) into which the wider unlicensed frequency band is divided, and improve
  • the spectrum utilization rate avoids occupying only a part of the RBs of the unlicensed frequency band, and causes other systems to detect that the channel is busy and cannot transmit data, resulting in a low frequency utilization problem.
  • the channel listening sub-frame is set to detect the busy state of the uplink channel, so that when the LTE terminal works in the unlicensed band, the corresponding interference avoidance mechanism can be adopted, that is, the state of the uplink channel can be detected, and the channel is detected.
  • the uplink data is transmitted when idle, and the uplink data is not transmitted when the channel is busy, so that the LTE terminal can coexist peacefully with other systems working in the unlicensed band (such as Wi-Fi system) when working in the unlicensed band to ensure
  • the LTE system can prevent the LTE system from causing large interference to other systems with interference avoidance mechanism when the LTE system works in the unlicensed band without the interference avoidance mechanism.
  • the channel monitoring subframe set by the terminal side can also detect the state of the uplink channel in the following two ways: mode 1: periodically detecting; mode 2: performing only when uplink data needs to be transmitted Detection.
  • a channel detecting system is also provided, which is applicable to an LTE system that is applicable to a device having a base station function, in an unlicensed frequency band, and includes: a dividing unit, configured to divide the unlicensed frequency band into multiple a frequency band; a setting unit, configured to set a determination threshold corresponding to each of the plurality of frequency bands for detecting a channel busy state in each of the frequency bands; and a channel detecting unit, configured to be used in the LTE system Providing, in a frame structure, a channel monitoring subframe for detecting a downlink channel state and/or an uplink channel state in each of the frequency bands, and according to the determination threshold corresponding to each of the frequency bands, for each of the frequency bands The busy state of the downlink channel and/or the uplink channel is detected.
  • the unlicensed frequency band is wide, the unlicensed frequency band is divided into a plurality of frequency bands, and a determination threshold corresponding to each frequency band for detecting the busy state of the channel is set, so as to correspond to each frequency band.
  • the threshold value is used to detect the busy state of the uplink channel and/or the downlink channel in each frequency band, so that when the LTE system works in the unlicensed frequency band, the wider unlicensed frequency band can be divided into multiple narrow bands (ie, multiple The frequency band), in turn, can determine the busy state of the uplink channel and/or the downlink channel in each narrowband separately, improve the spectrum utilization, avoid occupying only a part of the RBs of the unlicensed frequency band, and cause other systems to detect that the channel is busy.
  • the inability to transfer data results in a lower frequency utilization.
  • the corresponding interference avoidance mechanism can be adopted, that is, the uplink channel and/or the downlink channel can be used.
  • the state is detected, and the data is transmitted when the channel is idle (ie, when the downlink channel is detected to be idle, the downlink data is transmitted, and when the uplink channel is detected to be idle, the terminal is notified to transmit the uplink data), when the channel is detected to be busy,
  • the data is transmitted (that is, when the downlink channel is busy, the downlink data is not transmitted, and when the uplink channel is busy, the terminal is notified not to transmit the uplink data), so that the LTE system can work with the unlicensed band when working in the unlicensed band.
  • the channel monitoring subframe can detect the status of the downlink channel and/or the uplink channel in the following two manners: mode 1: periodically detecting, and mode 2: detecting only when downlink data and/or uplink data need to be transmitted.
  • the above downlink data includes both normal interaction data and control signaling.
  • the device with base station function described in the present invention includes a macro base station and a micro cell base station implemented by a communication device (such as a smart phone or the like).
  • the setting unit is specifically configured to: set the judgment corresponding to each frequency band according to a bandwidth of each frequency band and/or a signal type that each of the frequency bands needs to transmit Threshold.
  • the determination threshold may be set lower to make it easier for other systems to detect such a frequency band.
  • the inner channel is busy; for a wider frequency band, a larger judgment threshold can be appropriately selected, and for a narrower frequency band, a smaller judgment threshold can be appropriately selected.
  • the determination threshold corresponding to a frequency band for transmitting a synchronization signal in the plurality of frequency bands is smaller than the determination threshold corresponding to another frequency band of the plurality of frequency bands.
  • the dividing unit is specifically configured to: divide the unlicensed frequency band into the plurality of frequency bands equally; or arbitrarily divide the unlicensed frequency band into the plurality of frequency bands.
  • an unlicensed frequency band of 20 MHz it may be divided into four 5 MHz frequency bands by means of averaging, or may be divided into frequency bands of 5 MHz, 4.3 MHz, 1.4 MHz, 4.3 MHz, and 5 MHz by any division.
  • the method further includes: a first notification unit, configured to notify the terminal to measure channel quality in a specified frequency band of the plurality of frequency bands, and feed back channel quality measurement information of the specified frequency band.
  • the terminal may be notified to detect the channel quality information of the idle channel in the frequency band and report the channel quality, and then according to the channel quality reported by the terminal.
  • the information selects the appropriate channel to transmit the downlink data.
  • detecting time and/or detecting period of a channel monitoring subframe for detecting a downlink channel state and/or an uplink channel state in any one of the plurality of frequency bands The period is the same as or different from the detection time and/or detection period of the channel listening subframe used to detect the downlink channel state and/or the uplink channel state in other frequency bands.
  • the method further includes: a second notification unit, configured to notify the terminal of the bandwidth of the unlicensed frequency band, the bandwidth of each frequency band, and the determination threshold corresponding to each frequency band And determining, by the terminal, the busy state of the uplink channel in each frequency band according to the determining threshold corresponding to each frequency band.
  • a second notification unit configured to notify the terminal of the bandwidth of the unlicensed frequency band, the bandwidth of each frequency band, and the determination threshold corresponding to each frequency band And determining, by the terminal, the busy state of the uplink channel in each frequency band according to the determining threshold corresponding to each frequency band.
  • a device having a base station function comprising: a channel suitable for an LTE system applicable to a device having a base station function when operating in an unlicensed frequency band, as described in any one of the foregoing technical solutions Detection Systems.
  • a channel detection system is also provided, which is applicable to a terminal of an LTE system operating in an unlicensed frequency band, and includes: a receiving unit, configured to receive the unlicensed frequency band sent by a device having a base station function Bandwidth, a bandwidth of each frequency band when the unlicensed frequency band is divided into a plurality of frequency bands, and a determination threshold corresponding to each of the frequency bands for detecting a channel busy state in each of the frequency bands; a channel detecting unit, And configured to set, in a frame structure of the LTE system, a channel monitoring subframe for detecting an uplink channel state in each frequency band, and to each of the frequency bands according to the determining threshold corresponding to each frequency band The busy state of the upstream channel is detected.
  • the unlicensed frequency band is wide, the bandwidth of the unlicensed frequency band transmitted by the device receiving the function of the base station, the bandwidth of each frequency band when the unlicensed frequency band is divided into multiple frequency bands, and the corresponding frequency of each frequency band
  • the threshold value is determined, so that when the LTE terminal operates in the unlicensed frequency band, the device having the base station function can separately determine the busy state of the uplink channels of the plurality of narrowband (ie, multiple frequency bands) into which the wider unlicensed frequency band is divided, and improve
  • the spectrum utilization rate avoids occupying only a part of the RBs of the unlicensed frequency band, and causes other systems to detect that the channel is busy and cannot transmit data, resulting in a low frequency utilization problem.
  • the channel listening sub-frame is set to detect the busy state of the uplink channel, so that when the LTE terminal works in the unlicensed band, the corresponding interference avoidance mechanism can be adopted, that is, the state of the uplink channel can be detected, and the channel is detected.
  • the uplink data is transmitted when idle, and the uplink data is not transmitted when the channel is busy, so that the LTE terminal can coexist peacefully with other systems working in the unlicensed band (such as Wi-Fi system) when working in the unlicensed band to ensure
  • the LTE system can prevent the LTE system from causing large interference to other systems with interference avoidance mechanism when the LTE system works in the unlicensed band without the interference avoidance mechanism.
  • the channel monitoring subframe set by the terminal side can also detect the state of the uplink channel in the following two ways: mode 1: periodically detecting; mode 2: performing only when uplink data needs to be transmitted Detection.
  • a terminal comprising: a channel detecting system when the LTE system applicable to the terminal operates in an unlicensed frequency band as described above.
  • the wider unlicensed frequency band can be divided into multiple narrowbands, thereby respectively determining the busy state of the channel in each narrowband, and improving the spectrum utilization rate;
  • the LTE system can ensure that the LTE system interferes with other systems when the unlicensed band works in the unlicensed band.
  • FIG. 1 is a schematic diagram showing an interference avoidance rule of a Wi-Fi system
  • FIG. 2 is a schematic flow chart showing a channel detecting method when an LTE system suitable for a device having a base station function operates in an unlicensed band according to an embodiment of the present invention
  • FIG. 3 is a schematic block diagram of a channel detection system when an LTE system suitable for a device having a base station function operates in an unlicensed band according to an embodiment of the present invention
  • FIG. 4 is a schematic flow chart showing a channel detecting method when an LTE system applicable to a terminal operates in an unlicensed band according to an embodiment of the present invention
  • FIG. 5 shows a schematic block diagram of a channel detection system when an LTE system suitable for a terminal operates in an unlicensed band according to an embodiment of the present invention.
  • FIG. 2 is a schematic flow chart showing a channel detecting method when an LTE system suitable for a device having a base station function operates in an unlicensed band according to an embodiment of the present invention.
  • the unlicensed frequency band is wide, the unlicensed frequency band is divided into a plurality of frequency bands, and a determination threshold corresponding to each frequency band for detecting the busy state of the channel is set, so as to correspond to each frequency band.
  • the threshold value is used to detect the busy state of the uplink channel and/or the downlink channel in each frequency band, so that when the LTE system works in the unlicensed frequency band, the wider unlicensed frequency band can be divided into multiple narrow bands (ie, multiple The frequency band), in turn, can determine the busy state of the uplink channel and/or the downlink channel in each narrowband separately, improve the spectrum utilization, avoid occupying only a part of the RBs of the unlicensed frequency band, and cause other systems to detect that the channel is busy.
  • the inability to transfer data results in a lower frequency utilization.
  • the corresponding interference avoidance mechanism can be adopted, that is, the uplink channel and/or the downlink channel can be used.
  • the state is detected, and the data is transmitted when the channel is idle (ie, when the downlink channel is detected to be idle, the downlink data is transmitted, and when the uplink channel is detected to be idle, the terminal is notified to transmit the uplink data), when the channel is detected to be busy, Transmission Data (that is, when the downlink channel is busy, the downlink data is not transmitted, and when the uplink channel is busy, the terminal is notified not to transmit the uplink data), so that the LTE system can work in the unlicensed band when working in the unlicensed band.
  • the channel monitoring subframe can detect the status of the downlink channel and/or the uplink channel in the following two manners: mode 1: periodically detecting, and mode 2: detecting only when downlink data and/or uplink data need to be transmitted.
  • the above downlink data includes both normal interaction data and control signaling.
  • the device with base station function described in the present invention includes a macro base station and a micro cell base station implemented by a communication device (such as a smart phone or the like).
  • the determination threshold corresponding to each frequency band is set according to a bandwidth of each frequency band and/or a signal type that each of the frequency bands needs to transmit.
  • the determination threshold may be set lower to make it easier for other systems to detect such a frequency band.
  • the inner channel is busy; for a wider frequency band, a larger judgment threshold can be appropriately selected, and for a narrower frequency band, a smaller judgment threshold can be appropriately selected.
  • the determination threshold corresponding to a frequency band for transmitting a synchronization signal in the plurality of frequency bands is smaller than the determination threshold corresponding to another frequency band of the plurality of frequency bands.
  • the step of dividing the unlicensed frequency band into multiple frequency bands is specifically: dividing the unlicensed frequency band into the plurality of frequency bands equally; or arbitrarily dividing the unlicensed frequency band into The plurality of frequency bands.
  • an unlicensed frequency band of 20 MHz it may be divided into four 5 MHz frequency bands by means of averaging, or may be divided into frequency bands of 5 MHz, 4.3 MHz, 1.4 MHz, 4.3 MHz, and 5 MHz by any division.
  • the method further includes: notifying the terminal to measure channel quality in a specified frequency band of the plurality of frequency bands, and feeding back channel quality measurement information of the specified frequency band.
  • the terminal may be notified to detect the channel quality information of the idle channel in the frequency band and report the channel quality, and then according to the channel quality reported by the terminal.
  • the information selects the appropriate channel to transmit the downlink data.
  • a detection time and/or a detection period of a channel monitoring subframe for detecting a downlink channel state and/or an uplink channel state in any one of the plurality of frequency bands is used for detecting other
  • the detection time and/or the detection period of the channel listening subframe in the downlink channel state and/or the uplink channel state in the frequency band are the same or different.
  • the method further includes: notifying the bandwidth of the unlicensed frequency band, the bandwidth of each frequency band, and the determining threshold corresponding to each frequency band to the terminal, where the terminal is configured according to the terminal.
  • the determination threshold corresponding to each frequency band detects a busy state of an uplink channel in each frequency band.
  • FIG. 3 is a schematic block diagram of a channel detection system when an LTE system suitable for a base station-enabled device operates in an unlicensed band, in accordance with an embodiment of the present invention.
  • a channel detecting system 300 for an LTE system that is applicable to a device with a base station function in an unlicensed frequency band, according to an embodiment of the present invention, includes: a dividing unit 302, configured to divide the unlicensed frequency band a plurality of frequency bands; a setting unit 304, configured to set a determination threshold corresponding to each of the plurality of frequency bands for detecting a channel busy state in each of the frequency bands; and a channel detecting unit 306, configured to Providing, in a frame structure of the LTE system, a channel monitoring subframe for detecting a downlink channel state and/or a downlink channel state in each of the frequency bands, and according to the determination threshold corresponding to each of the frequency bands Downlink in each frequency band The busy state of the channel and/or the upstream channel is detected.
  • the unlicensed frequency band is wide, the unlicensed frequency band is divided into a plurality of frequency bands, and a determination threshold corresponding to each frequency band for detecting the busy state of the channel is set, so as to correspond to each frequency band.
  • the threshold value is used to detect the busy state of the uplink channel and/or the downlink channel in each frequency band, so that when the LTE system works in the unlicensed frequency band, the wider unlicensed frequency band can be divided into multiple narrow bands (ie, multiple The frequency band), in turn, can determine the busy state of the uplink channel and/or the downlink channel in each narrowband separately, improve the spectrum utilization, avoid occupying only a part of the RBs of the unlicensed frequency band, and cause other systems to detect that the channel is busy.
  • the inability to transfer data results in a lower frequency utilization.
  • the corresponding interference avoidance mechanism can be adopted, that is, the uplink channel and/or the downlink channel can be used.
  • the state is detected, and the data is transmitted when the channel is idle (ie, when the downlink channel is detected to be idle, the downlink data is transmitted, and when the uplink channel is detected to be idle, the terminal is notified to transmit the uplink data), when the channel is detected to be busy,
  • the data is transmitted (that is, when the downlink channel is busy, the downlink data is not transmitted, and when the uplink channel is busy, the terminal is notified not to transmit the uplink data), so that the LTE system can work with the unlicensed band when working in the unlicensed band.
  • the channel monitoring subframe can detect the status of the downlink channel and/or the uplink channel in the following two manners: mode 1: periodically detecting, and mode 2: detecting only when downlink data and/or uplink data need to be transmitted.
  • the above downlink data includes both normal interaction data and control signaling.
  • the device with base station function described in the present invention includes A macro base station and a micro cell base station implemented by a communication device such as a smart phone or the like.
  • the setting unit 304 is configured to: set the corresponding to each of the frequency bands according to a bandwidth of each frequency band and/or a signal type that each of the frequency bands needs to transmit Determine the threshold.
  • the determination threshold may be set lower to make it easier for other systems to detect such a frequency band.
  • the inner channel is busy; for a wider frequency band, a larger judgment threshold can be appropriately selected, and for a narrower frequency band, a smaller judgment threshold can be appropriately selected.
  • the determination threshold corresponding to a frequency band for transmitting a synchronization signal in the plurality of frequency bands is smaller than the determination threshold corresponding to another frequency band of the plurality of frequency bands.
  • the dividing unit 302 is specifically configured to: divide the unlicensed frequency band into the plurality of frequency bands equally; or arbitrarily divide the unlicensed frequency band into the multiple frequency bands.
  • an unlicensed frequency band of 20 MHz it may be divided into four 5 MHz frequency bands by means of averaging, or may be divided into frequency bands of 5 MHz, 4.3 MHz, 1.4 MHz, 4.3 MHz, and 5 MHz by any division.
  • the method further includes: a first notification unit 308, configured to notify the terminal to measure channel quality in a specified frequency band of the plurality of frequency bands, and feed back channel quality measurement information of the specified frequency band.
  • the terminal may be notified to detect the channel quality information of the idle channel in the frequency band and report the channel quality, and then according to the channel quality reported by the terminal.
  • the information selects the appropriate channel to transmit the downlink data.
  • Detection time and/or detection period of the channel listening subframe of the downlink channel state and/or the uplink channel state and detection time and/or detection time of the channel monitoring subframe for detecting the downlink channel state and/or the uplink channel state in other frequency bands The detection periods are the same or different.
  • the method further includes: a second notification unit 310, configured to notify, to the bandwidth of the unlicensed frequency band, the bandwidth of each frequency band, and the determination threshold corresponding to each frequency band to a terminal, configured to detect, by the terminal, a busy state of an uplink channel in each frequency band according to the determining threshold corresponding to each frequency band.
  • a second notification unit 310 configured to notify, to the bandwidth of the unlicensed frequency band, the bandwidth of each frequency band, and the determination threshold corresponding to each frequency band to a terminal, configured to detect, by the terminal, a busy state of an uplink channel in each frequency band according to the determining threshold corresponding to each frequency band.
  • the present invention also proposes a device (not shown) having a base station function, including: a channel detecting system 300 for an LTE system suitable for a device having a base station function, when operating in an unlicensed band, as shown in FIG. .
  • FIG. 4 is a schematic flow chart of a channel detecting method when an LTE system applicable to a terminal operates in an unlicensed band according to an embodiment of the present invention.
  • a channel detecting method for an LTE system applicable to a terminal in an unlicensed band includes: Step 402: Receive a bandwidth of the unlicensed band sent by a device having a base station function a bandwidth of each frequency band when the unlicensed frequency band is divided into a plurality of frequency bands, and a determination threshold corresponding to each of the frequency bands for detecting a channel busy state in each of the frequency bands; a channel monitoring subframe for detecting an uplink channel state in each frequency band is set in a frame structure of the LTE system, and the uplink channel in each of the frequency bands is determined according to the determination threshold corresponding to each frequency band The busy state is detected.
  • the unlicensed frequency band is wide, the bandwidth of the unlicensed frequency band transmitted by the device receiving the function of the base station, the bandwidth of each frequency band when the unlicensed frequency band is divided into multiple frequency bands, and the corresponding frequency of each frequency band
  • the threshold value is determined, so that when the LTE terminal operates in the unlicensed frequency band, the device having the base station function can separately determine the busy state of the uplink channels of the plurality of narrowband (ie, multiple frequency bands) into which the wider unlicensed frequency band is divided, and improve
  • the spectrum utilization rate avoids occupying only a part of the RBs of the unlicensed frequency band, and causes other systems to detect that the channel is busy and cannot transmit data, resulting in a low frequency utilization problem.
  • the channel listening sub-frame is set to detect the busy state of the uplink channel, so that when the LTE terminal works in the unlicensed band, the corresponding interference avoidance mechanism can be adopted, that is, the state of the uplink channel can be detected, and the channel is detected. Transmit upstream data when idle, when a message is detected When the channel is busy, the uplink data is not transmitted, so that the LTE terminal can coexist peacefully with other systems working in the unlicensed band (such as Wi-Fi system) when working in the unlicensed band to ensure that the LTE system can work normally in the unlicensed band. Under the premise, the LTE system is prevented from causing large interference to other systems with interference avoidance mechanism when there is no interference avoidance mechanism when working in the unlicensed frequency band.
  • the channel monitoring subframe set by the terminal side can also detect the state of the uplink channel in the following two ways: mode 1: periodically detecting; mode 2: performing only when uplink data needs to be transmitted Detection.
  • FIG. 5 shows a schematic block diagram of a channel detection system when an LTE system suitable for a terminal operates in an unlicensed band according to an embodiment of the present invention.
  • the channel detecting system 500 when the LTE system is applicable to the terminal in the unlicensed frequency band includes: a receiving unit 502, configured to receive the non-transmitted by the device with the function of the base station a bandwidth of the licensed frequency band, a bandwidth of each frequency band when the unlicensed frequency band is divided into a plurality of frequency bands, and a determination threshold corresponding to each of the frequency bands for detecting a channel busy state in each of the frequency bands; channel detection The unit 504 is configured to set, in a frame structure of the LTE system, a channel monitoring subframe for detecting an uplink channel state in each frequency band, and according to the determining threshold corresponding to each frequency band, The busy state of the uplink channel in each frequency band is detected.
  • the unlicensed frequency band is wide, the bandwidth of the unlicensed frequency band transmitted by the device receiving the function of the base station, the bandwidth of each frequency band when the unlicensed frequency band is divided into multiple frequency bands, and the corresponding frequency of each frequency band
  • the threshold value is determined, so that when the LTE terminal operates in the unlicensed frequency band, the device having the base station function can separately determine the busy state of the uplink channels of the plurality of narrowband (ie, multiple frequency bands) into which the wider unlicensed frequency band is divided, and improve
  • the spectrum utilization rate avoids occupying only a part of the RBs of the unlicensed frequency band, and causes other systems to detect that the channel is busy and cannot transmit data, resulting in a low frequency utilization problem.
  • the corresponding interference avoidance mechanism can be adopted, that is, the state of the uplink channel can be detected, and the uplink data is transmitted when the channel is idle, and the uplink data is not transmitted when the channel is busy.
  • LTE terminals can coexist peacefully with other systems operating in unlicensed bands (such as Wi-Fi systems) when operating in unlicensed bands to prevent LTE systems from being de-authorized while ensuring that LTE systems can operate in unlicensed bands.
  • unlicensed bands such as Wi-Fi systems
  • the channel monitoring subframe set by the terminal side can also detect the state of the uplink channel in the following two ways: mode 1: periodically detecting; mode 2: performing only when uplink data needs to be transmitted Detection.
  • the present invention also proposes a terminal (not shown), including: a channel detecting system 500 when the LTE system applicable to the terminal operates in an unlicensed frequency band as shown in FIG. 5.
  • the present invention mainly proposes a narrowband or even RB-based LBT detection scheme for the LBT mechanism of the LAA system to improve the spectrum utilization of the LTE system when operating in an unlicensed frequency band.
  • the main body of the LBT that is, the base station (for convenience of description, the following is a description of the base station, and those skilled in the art need to understand that the base station can be all devices having the function of the base station) or when the terminal performs LBT detection. Separate reception processing of power over the entire unlicensed spectrum bandwidth.
  • an unlicensed carrier is a bandwidth of 20 MHz
  • the granularity of the narrowband-based LBT channel state detection mechanism may be 10 MHz, 5 MHz, 2.5 MHz, or 1.25 MHz, or even to RB.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PBCH Physical Broadcast Channel
  • the granularity of the LBT channel state detection mechanism may be uniform or non-uniform.
  • the low-frequency to high-frequency bandwidth is 5MHz, 4.3MHz, 1.4MHz, 4.3MHz, 5MHz, and the low-frequency 5MHz and 4.3MHz use the same judgment threshold (ie, threshold 1).
  • the middle 1.4 MHz uses a decision threshold (ie, threshold 2), and the high frequency 5 MHz and 4.3 MHz use the same decision threshold (ie, threshold 3).
  • each narrowband may correspond to a determination threshold.
  • the threshold for judging the busy state of each narrowband channel is also different. For example, for the intermediate 1.4MHz shown in Table 2, because the PSS/SSS and PBCH are transmitted, the threshold of this narrowband is low. Some, that is to say, when it is detected that the surrounding signal is not particularly high, it is judged to be busy, so as to avoid interference of the bandwidth of other sections.
  • the LBT executor can detect each granularity separately when detecting the channel state. That is to say, power averaging is not required between different narrowbands, and power averaging or other processing is performed only within each narrowband. Specifically, after obtaining the power of each narrowband, it is compared with a predetermined threshold value of the channel busy state of each narrowband to determine a busy state of each narrowband, that is, if a certain narrowband power is greater than a threshold , the next period of time can not be occupied; if it is lower than the threshold, then the next period of time can be occupied.
  • the base station is required to notify the terminal in advance of the carrier bandwidth of the unlicensed spectrum and the detection granularity of the narrowband LBT and the threshold corresponding to each granularity.
  • the relevant CQI Channel Quality Indicator
  • the relevant CQI Channel Quality Indicator
  • the repetition period of the LBT for each narrow band may be the same or different.
  • the present invention proposes a narrowband-based LBT detection mechanism, so that the unlicensed spectrum can be used more dynamically and flexibly by different access modes, thereby improving spectrum utilization.
  • the present invention provides a channel detection scheme for a new LTE system operating in an unlicensed frequency band, so that when the LTE system operates in an unlicensed frequency band, it can be wider.
  • the unlicensed frequency band is divided into multiple narrowbands to determine the busy state of the channel in each narrowband and improve the spectrum utilization rate.
  • the detection of the busy state of the channel also ensures that the LTE system is in the unlicensed frequency band. Under the premise of normal operation, the LTE system is prevented from causing large interference to other systems when working in an unlicensed band.

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Abstract

本发明提供了一种LTE系统在非授权频段工作时的信道检测方法、检测系统、具有基站功能的设备和终端，其中，适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测方法，包括：将非授权频段划分为多个频带；设置所述多个频带中每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；在LTE系统的帧结构中设置用于检测每个频带内的下行信道状态和/或上行信道状态的信道监听子帧，并根据每个频带对应的判断阈值对每个频带内的下行信道和/或上行信道的忙闲状态进行检测。本发明的技术方案提高了非授权频段的频谱利用率，并且能够确保LTE系统在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时对其他系统产生较大的干扰。

Description

信道检测方法及系统、具有基站功能的设备和终端 技术领域
本发明涉及通信技术领域，具体而言，涉及一种LTE系统在非授权频段工作时的信道检测方法、一种LTE系统在非授权频段工作时的信道检测系统、一种具有基站功能的设备和一种终端。
背景技术
随着通信业务量的急剧增加，3GPP的授权频谱越来越不足以提供更高的网络容量。为了进一步提高频谱资源的利用率，3GPP正讨论如何在授权频谱的帮助下使用未授权频谱，如2.4GHz和5GHz频段。这些未授权频谱目前主要是Wi-Fi、蓝牙、雷达、医疗等系统在使用。
通常情况下，为已授权频段设计的接入技术，如LTE(Long Term Evolution，长期演进)不适合在未授权频段上使用，因为LTE这类接入技术对频谱效率和用户体验优化的要求非常高。然而，载波聚合(Carrier Aggregation，CA)功能让将LTE部署于非授权频段变为可能。3GPP提出了LAA(LTE Assisted Access，LTE辅助接入)的概念，借助LTE授权频谱的帮助来使用未授权频谱。而未授权频谱可以有两种工作方式，一种是补充下行(SDL，Supplemental Downlink)，即只有下行传输子帧；另一种是TDD模式，既包含下行子帧、也包含上行子帧。补充下行这种情况只能是借助载波聚合技术使用。而TDD模式除了可以借助载波聚合技术使用外，还可以借助DC(Dual Connectivity，双连通)使用，也可以独立使用。
相比于Wi-Fi系统，工作在未授权频段的LTE系统有能力提供更高的频谱效率和更大的覆盖效果，同时基于同一个核心网让数据流量在授权频段和未授权频段之间无缝切换。对用户来说，这意味着更好的宽带体验、更高的速率、更好的稳定性和移动便利。
现有的在非授权频谱上使用的接入技术，如Wi-Fi，具有较弱的抗干扰能力。为了避免干扰，Wi-Fi系统设计了很多干扰避免规则，如CSMA/CD(Carrier Sense Multiple Access/Collision Detection，载波监听多路访问/冲突检测方法)，这种方法的基本原理是Wi-Fi的AP(Access Point，接入点)或者终端在发送信令或者数据之前，要先监听检测周围是否有其他AP或者其他终端在发送/接收信令或数据，若有，则继续监听，直到监听到没有为止；若没有，则生成一个随机数作为退避时间，在这个退避时间内，如果没检测到有信令或数据传输，那么在退避时间结束之后，AP或终端可以开始发送信令或数据。该过程如图1所示。
但是，LTE网络中由于有很好的正交性保证了干扰水平，所以基站与用户的上下行传输不用考虑周围是否有其他基站或其他用户在传输数据。如果LTE在非授权频段上使用时也不考虑周围是否有其他设备在使用非授权频段，那么将对Wi-Fi设备带来极大的干扰。因为LTE只要有业务就进行传输，没有任何监听规则，那么Wi-Fi设备在LTE有业务传输时就不能传输，只能等到LTE业务传输完成，才能检测到信道空闲状态以进行数据传输。
可见，LTE网络在使用非授权频段时，最主要的关键点之一是确保LAA能够在公平友好的基础上和现有的接入技术(比如Wi-Fi)共存。而传统的LTE系统中没有LBT(Listen Before Talk，先听后说)的机制来避免碰撞。
同时，类似于Wi-Fi的LBT机制都是基于宽带来检测的，也就是说直接检测整个较大频段内的信道状态来判断整个频段是否可用，这样存在的缺点是频谱利用不够灵活，导致频谱利用率低。具体地，如运营商A的LAA系统检测到LBT信道闲，则占用了非授权频段，但实际上该LAA小区可能仅占用了其中的部分RB(Resource Block，资源块)，而其它的RB都没占用，并且属于空闲状态。而在运营商B的LAA系统检测LBT信道状态时，由于运营商A的LAA系统使用了部分资源，可能会导致运营商B的LAA系统检测到信道繁忙，进而不能传输数据，但实际上有一部分RB根本没被使用，这种情况下，就会造成频谱利用率降低的问题。
因此，如何能够确保LTE系统在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时对其他系统产生较大的干扰，同时提高频谱利用率成为亟待解决的技术问题。
发明内容
本发明正是基于上述技术问题至少之一，提出了一种新的LTE系统在非授权频段工作时的信道检测方案，使得LTE系统工作在非授权频带内时，可以将较宽的非授权频段划分为多个窄带，进而分别判断每个窄带内的信道的忙闲状态，提高了频谱利用率；而通过对信道的忙闲状态进行检测，也使得能够确保LTE系统在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时对其他系统产生较大的干扰。
有鉴于此，根据本发明的第一方面，提出了一种适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测方法，包括：将所述非授权频段划分为多个频带；设置所述多个频带中每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；在所述LTE系统的帧结构中设置用于检测所述每个频带内的下行信道状态和/或上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的下行信道和/或上行信道的忙闲状态进行检测。
在该技术方案中，由于非授权频段较宽，因此通过将非授权频段划分为多个频带，并设置每个频带对应的用于检测信道忙闲状态的判断阈值，以根据每个频带对应的判断阈值对每个频带内的上行信道和/或下行信道的忙闲状态进行检测，使得LTE系统工作在非授权频带内时，可以将较宽的非授权频段划分为多个窄带(即多个频带)，进而能够分别判断每个窄带内的上行信道和/或下行信道的忙闲状态，提高了频谱利用率，避免仅占用了非授权频段的一部分RB，而导致其他系统检测到信道繁忙而无法传输数据导致频率利用率较低的问题。
而通过设置信道监听子帧对上行信道和/或下行信道的忙闲状态进行检测，使得LTE系统工作在非授权频段时，能够采取相应的干扰避让机制，即能够对上行信道和/或下行信道的状态进行检测，并在检测到信道 空闲时传输数据(即在检测到下行信道空闲时，传输下行数据，在检测到上行信道空闲时，通知终端传输上行数据)，在检测到信道繁忙时不传输数据(即在检测到下行信道繁忙时，不传输下行数据，在检测到上行信道繁忙时，通知终端不传输上行数据)，进而使得LTE系统在非授权频段工作时可以与工作在非授权频段的其他系统(如Wi-Fi系统)和平共存，以在确保LTE系统能够在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时由于没有干扰避让机制而对具有干扰避让机制的其他系统产生较大的干扰。
其中，信道监听子帧可以通过以下两种方式检测下行信道和/或上行信道的状态：方式一：周期性地进行检测；方式二：仅在需要传输下行数据和/或上行数据时再进行检测。在一个实施例中，方式二的方案可以如下所述：在需要传输下行数据和/或上行数据时，检测下行信道和/或上行信道的状态，若检测到信道忙，则取一个随机值N，并继续检测，若再次检测确定信道闲，则取N＝N-1，否则N不变，直到N减为0时再发送数据。
此外，上述的下行数据既包括普通的交互数据，也包括控制信令等。本领域的技术人员也应该理解：本发明中所述的具有基站功能的设备包括宏基站和通过通信设备(如智能手机等)实现的微小区基站等。
在上述技术方案中，优选地，根据所述每个频带的带宽和/或所述每个频带需要传输的信号类型，设置所述每个频带对应的所述判断阈值。
具体地，对于传输某些较重要的信号类型的频带，如传输同步信号的频带，为了避免其他系统占用此类频带，可以将判断阈值设置较低，以使其他系统更容易检测到此类频带内的信道繁忙；而对于较宽的频带，可以适当选用较大的判断阈值，对于较窄的频带，可以适当选用较小的判断阈值。
在上述技术方案中，优选地，所述多个频带中用于传输同步信号的频带对应的所述判断阈值小于所述多个频带中的其他频带对应的所述判断阈值。通过设置用于传输同步信号的频带对应的判断阈值小于其他频带对应的判断阈值，使得其他系统能够更加容易地检测到传输同步信号的频带内 的信道繁忙，避免其他系统占用传输同步信号的频带而影响LTE系统传输同步信号。
在上述技术方案中，优选地，将所述非授权频段划分为多个频带的步骤具体为：将所述非授权频段平均划分为所述多个频带；或将所述非授权频段任意划分为所述多个频带。
具体地，如对于20MHz的非授权频段，可以通过平均划分的方式划分为4个5MHz的频带，也可以通过任意划分的方式划分为5MHz、4.3MHz、1.4MHz、4.3MHz和5MHz的频带。
在上述技术方案中，优选地，还包括：通知终端在所述多个频带中的指定频带内测量信道质量，并反馈所述指定频带的信道质量测量信息。
具体地，如具有基站功能的设备在通过信道监听子帧检测到某些频带内的信道空闲时，可以通知终端检测这些频带内的空闲信道的信道质量信息并上报，进而根据终端上报的信道质量信息选择合适的信道传输下行数据。
在上述技术方案中，优选地，用于检测所述多个频带中任一频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期与用于检测其他频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期相同或不同。
在上述技术方案中，优选地，还包括：将所述非授权频段的带宽、所述每个频带的带宽和所述每个频带对应的所述判断阈值通知给终端，以供所述终端根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
根据本发明的第二方面，还提出了一种适用于终端的LTE系统在非授权频段工作时的信道检测方法，包括：接收具有基站功能的设备发送的所述非授权频段的带宽、将所述非授权频段划分为多个频带时每个频带的带宽和所述每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；在所述LTE系统的帧结构中设置用于检测所述每个频带内的上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
在该技术方案中，由于非授权频段较宽，因此通过接收具有基站功能的设备发送的非授权频段的带宽、将非授权频段划分为多个频带时每个频带的带宽和每个频带对应的判断阈值，使得LTE终端工作在非授权频带内时，能够分别判断具有基站功能的设备将较宽的非授权频段划分为的多个窄带(即多个频带)的上行信道的忙闲状态，提高了频谱利用率，避免仅占用了非授权频段的一部分RB，而导致其他系统检测到信道繁忙而无法传输数据导致频率利用率较低的问题。
而通过设置信道监听子帧对上行信道的忙闲状态进行检测，使得LTE终端工作在非授权频段时，能够采取相应的干扰避让机制，即能够对上行信道的状态进行检测，并在检测到信道空闲时传输上行数据，在检测到信道繁忙时不传输上行数据，进而使得LTE终端在非授权频段工作时可以与工作在非授权频段的其他系统(如Wi-Fi系统)和平共存，以在确保LTE系统能够在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时由于没有干扰避让机制而对具有干扰避让机制的其他系统产生较大的干扰。
类似于基站侧的检测方式，终端侧设置的信道监听子帧也可以通过以下两种方式检测上行信道的状态：方式一：周期性地进行检测；方式二：仅在需要传输上行数据时再进行检测。在一个实施例中，方式二的方案可以如下所述：在需要传输上行数据时，检测上行信道的状态，若检测到信道忙，则取一个随机值N，并继续检测，若再次检测确定信道闲，则取N＝N-1，否则N不变，直到N减为0时再发送数据。
根据本发明的第三方面，还提出了一种适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测系统，包括：划分单元，用于将所述非授权频段划分为多个频带；设置单元，用于设置所述多个频带中每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；信道检测单元，用于在所述LTE系统的帧结构中设置用于检测所述每个频带内的下行信道状态和/或上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的下行信道和/或上行信道的忙闲状态进行检测。
在该技术方案中，由于非授权频段较宽，因此通过将非授权频段划分为多个频带，并设置每个频带对应的用于检测信道忙闲状态的判断阈值，以根据每个频带对应的判断阈值对每个频带内的上行信道和/或下行信道的忙闲状态进行检测，使得LTE系统工作在非授权频带内时，可以将较宽的非授权频段划分为多个窄带(即多个频带)，进而能够分别判断每个窄带内的上行信道和/或下行信道的忙闲状态，提高了频谱利用率，避免仅占用了非授权频段的一部分RB，而导致其他系统检测到信道繁忙而无法传输数据导致频率利用率较低的问题。
而通过设置信道监听子帧对上行信道和/或下行信道的忙闲状态进行检测，使得LTE系统工作在非授权频段时，能够采取相应的干扰避让机制，即能够对上行信道和/或下行信道的状态进行检测，并在检测到信道空闲时传输数据(即在检测到下行信道空闲时，传输下行数据，在检测到上行信道空闲时，通知终端传输上行数据)，在检测到信道繁忙时不传输数据(即在检测到下行信道繁忙时，不传输下行数据，在检测到上行信道繁忙时，通知终端不传输上行数据)，进而使得LTE系统在非授权频段工作时可以与工作在非授权频段的其他系统(如Wi-Fi系统)和平共存，以在确保LTE系统能够在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时由于没有干扰避让机制而对具有干扰避让机制的其他系统产生较大的干扰。
其中，信道监听子帧可以通过以下两种方式检测下行信道和/或上行信道的状态：方式一：周期性地进行检测；方式二：仅在需要传输下行数据和/或上行数据时再进行检测。在一个实施例中，方式二的方案可以如下所述：在需要传输下行数据和/或上行数据时，检测下行信道和/或上行信道的状态，若检测到信道忙，则取一个随机值N，并继续检测，若再次检测确定信道闲，则取N＝N-1，否则N不变，直到N减为0时再发送数据。
此外，上述的下行数据既包括普通的交互数据，也包括控制信令等。本领域的技术人员也应该理解：本发明中所述的具有基站功能的设备包括宏基站和通过通信设备(如智能手机等)实现的微小区基站等。
在上述技术方案中，优选地，所述设置单元具体用于：根据所述每个频带的带宽和/或所述每个频带需要传输的信号类型，设置所述每个频带对应的所述判断阈值。
具体地，对于传输某些较重要的信号类型的频带，如传输同步信号的频带，为了避免其他系统占用此类频带，可以将判断阈值设置较低，以使其他系统更容易检测到此类频带内的信道繁忙；而对于较宽的频带，可以适当选用较大的判断阈值，对于较窄的频带，可以适当选用较小的判断阈值。
在上述技术方案中，优选地，所述多个频带中用于传输同步信号的频带对应的所述判断阈值小于所述多个频带中的其他频带对应的所述判断阈值。通过设置用于传输同步信号的频带对应的判断阈值小于其他频带对应的判断阈值，使得其他系统能够更加容易地检测到传输同步信号的频带内的信道繁忙，避免其他系统占用传输同步信号的频带而影响LTE系统传输同步信号。
在上述技术方案中，优选地，所述划分单元具体用于：将所述非授权频段平均划分为所述多个频带；或将所述非授权频段任意划分为所述多个频带。
具体地，如对于20MHz的非授权频段，可以通过平均划分的方式划分为4个5MHz的频带，也可以通过任意划分的方式划分为5MHz、4.3MHz、1.4MHz、4.3MHz和5MHz的频带。
在上述技术方案中，优选地，还包括：第一通知单元，用于通知终端在所述多个频带中的指定频带内测量信道质量，并反馈所述指定频带的信道质量测量信息。
具体地，如具有基站功能的设备在通过信道监听子帧检测到某些频带内的信道空闲时，可以通知终端检测这些频带内的空闲信道的信道质量信息并上报，进而根据终端上报的信道质量信息选择合适的信道传输下行数据。
在上述技术方案中，优选地，用于检测所述多个频带中任一频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周 期与用于检测其他频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期相同或不同。
在上述技术方案中，优选地，还包括：第二通知单元，用于将所述非授权频段的带宽、所述每个频带的带宽和所述每个频带对应的所述判断阈值通知给终端，以供所述终端根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
根据本发明的第四方面，还提出了一种具有基站功能的设备，包括：如上述任一项技术方案中所述的适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测系统。
根据本发明的第五方面，还提出了一种适用于终端的LTE系统在非授权频段工作时的信道检测系统，包括：接收单元，用于接收具有基站功能的设备发送的所述非授权频段的带宽、将所述非授权频段划分为多个频带时每个频带的带宽和所述每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；信道检测单元，用于在所述LTE系统的帧结构中设置用于检测所述每个频带内的上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
在该技术方案中，由于非授权频段较宽，因此通过接收具有基站功能的设备发送的非授权频段的带宽、将非授权频段划分为多个频带时每个频带的带宽和每个频带对应的判断阈值，使得LTE终端工作在非授权频带内时，能够分别判断具有基站功能的设备将较宽的非授权频段划分为的多个窄带(即多个频带)的上行信道的忙闲状态，提高了频谱利用率，避免仅占用了非授权频段的一部分RB，而导致其他系统检测到信道繁忙而无法传输数据导致频率利用率较低的问题。
而通过设置信道监听子帧对上行信道的忙闲状态进行检测，使得LTE终端工作在非授权频段时，能够采取相应的干扰避让机制，即能够对上行信道的状态进行检测，并在检测到信道空闲时传输上行数据，在检测到信道繁忙时不传输上行数据，进而使得LTE终端在非授权频段工作时可以与工作在非授权频段的其他系统(如Wi-Fi系统)和平共存，以在确保 LTE系统能够在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时由于没有干扰避让机制而对具有干扰避让机制的其他系统产生较大的干扰。
类似于基站侧的检测方式，终端侧设置的信道监听子帧也可以通过以下两种方式检测上行信道的状态：方式一：周期性地进行检测；方式二：仅在需要传输上行数据时再进行检测。在一个实施例中，方式二的方案可以如下所述：在需要传输上行数据时，检测上行信道的状态，若检测到信道忙，则取一个随机值N，并继续检测，若再次检测确定信道闲，则取N＝N-1，否则N不变，直到N减为0时再发送数据。
根据本发明的第六方面，还提出了一种终端，包括：如上述的适用于终端的LTE系统在非授权频段工作时的信道检测系统。
通过以上技术方案，使得LTE系统工作在非授权频带内时，可以将较宽的非授权频段划分为多个窄带，进而分别判断每个窄带内的信道的忙闲状态，提高了频谱利用率；而通过对信道的忙闲状态进行检测，也使得能够确保LTE系统在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时对其他系统产生较大的干扰。
附图说明
图1示出了Wi-Fi系统的干扰避免规则的示意图；
图2示出了根据本发明的实施例的适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测方法的示意流程图；
图3示出了根据本发明的实施例的适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测系统的示意框图；
图4示出了根据本发明的实施例的适用于终端的LTE系统在非授权频段工作时的信道检测方法的示意流程图；
图5示出了根据本发明的实施例的适用于终端的LTE系统在非授权频段工作时的信道检测系统的示意框图。
具体实施方式
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行进一步的详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。
图2示出了根据本发明的实施例的适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测方法的示意流程图。
如图2所示，根据本发明的实施例的适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测方法，包括：步骤202，将所述非授权频段划分为多个频带；步骤204，设置所述多个频带中每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；步骤206，在所述LTE系统的帧结构中设置用于检测所述每个频带内的下行信道状态和/或上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的下行信道和/或上行信道的忙闲状态进行检测。
在该技术方案中，由于非授权频段较宽，因此通过将非授权频段划分为多个频带，并设置每个频带对应的用于检测信道忙闲状态的判断阈值，以根据每个频带对应的判断阈值对每个频带内的上行信道和/或下行信道的忙闲状态进行检测，使得LTE系统工作在非授权频带内时，可以将较宽的非授权频段划分为多个窄带(即多个频带)，进而能够分别判断每个窄带内的上行信道和/或下行信道的忙闲状态，提高了频谱利用率，避免仅占用了非授权频段的一部分RB，而导致其他系统检测到信道繁忙而无法传输数据导致频率利用率较低的问题。
而通过设置信道监听子帧对上行信道和/或下行信道的忙闲状态进行检测，使得LTE系统工作在非授权频段时，能够采取相应的干扰避让机制，即能够对上行信道和/或下行信道的状态进行检测，并在检测到信道空闲时传输数据(即在检测到下行信道空闲时，传输下行数据，在检测到上行信道空闲时，通知终端传输上行数据)，在检测到信道繁忙时不传输 数据(即在检测到下行信道繁忙时，不传输下行数据，在检测到上行信道繁忙时，通知终端不传输上行数据)，进而使得LTE系统在非授权频段工作时可以与工作在非授权频段的其他系统(如Wi-Fi系统)和平共存，以在确保LTE系统能够在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时由于没有干扰避让机制而对具有干扰避让机制的其他系统产生较大的干扰。
其中，信道监听子帧可以通过以下两种方式检测下行信道和/或上行信道的状态：方式一：周期性地进行检测；方式二：仅在需要传输下行数据和/或上行数据时再进行检测。在一个实施例中，方式二的方案可以如下所述：在需要传输下行数据和/或上行数据时，检测下行信道和/或上行信道的状态，若检测到信道忙，则取一个随机值N，并继续检测，若再次检测确定信道闲，则取N＝N-1，否则N不变，直到N减为0时再发送数据。
此外，上述的下行数据既包括普通的交互数据，也包括控制信令等。本领域的技术人员也应该理解：本发明中所述的具有基站功能的设备包括宏基站和通过通信设备(如智能手机等)实现的微小区基站等。
在上述技术方案中，优选地，根据所述每个频带的带宽和/或所述每个频带需要传输的信号类型，设置所述每个频带对应的所述判断阈值。
具体地，对于传输某些较重要的信号类型的频带，如传输同步信号的频带，为了避免其他系统占用此类频带，可以将判断阈值设置较低，以使其他系统更容易检测到此类频带内的信道繁忙；而对于较宽的频带，可以适当选用较大的判断阈值，对于较窄的频带，可以适当选用较小的判断阈值。
在上述技术方案中，优选地，所述多个频带中用于传输同步信号的频带对应的所述判断阈值小于所述多个频带中的其他频带对应的所述判断阈值。通过设置用于传输同步信号的频带对应的判断阈值小于其他频带对应的判断阈值，使得其他系统能够更加容易地检测到传输同步信号的频带内的信道繁忙，避免其他系统占用传输同步信号的频带而影响LTE系统传输同步信号。
在上述技术方案中，优选地，将所述非授权频段划分为多个频带的步骤具体为：将所述非授权频段平均划分为所述多个频带；或将所述非授权频段任意划分为所述多个频带。
具体地，如对于20MHz的非授权频段，可以通过平均划分的方式划分为4个5MHz的频带，也可以通过任意划分的方式划分为5MHz、4.3MHz、1.4MHz、4.3MHz和5MHz的频带。
在上述技术方案中，优选地，还包括：通知终端在所述多个频带中的指定频带内测量信道质量，并反馈所述指定频带的信道质量测量信息。
具体地，如具有基站功能的设备在通过信道监听子帧检测到某些频带内的信道空闲时，可以通知终端检测这些频带内的空闲信道的信道质量信息并上报，进而根据终端上报的信道质量信息选择合适的信道传输下行数据。
在上述技术方案中，优选地，用于检测所述多个频带中任一频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期与用于检测其他频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期相同或不同。
在上述技术方案中，优选地，还包括：将所述非授权频段的带宽、所述每个频带的带宽和所述每个频带对应的所述判断阈值通知给终端，以供所述终端根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
图3示出了根据本发明的实施例的适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测系统的示意框图。
如图3所示，根据本发明的实施例的适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测系统300，包括：划分单元302，用于将所述非授权频段划分为多个频带；设置单元304，用于设置所述多个频带中每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；信道检测单元306，用于在所述LTE系统的帧结构中设置用于检测所述每个频带内的下行信道状态和/或下行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的下行信 道和/或上行信道的忙闲状态进行检测。
在该技术方案中，由于非授权频段较宽，因此通过将非授权频段划分为多个频带，并设置每个频带对应的用于检测信道忙闲状态的判断阈值，以根据每个频带对应的判断阈值对每个频带内的上行信道和/或下行信道的忙闲状态进行检测，使得LTE系统工作在非授权频带内时，可以将较宽的非授权频段划分为多个窄带(即多个频带)，进而能够分别判断每个窄带内的上行信道和/或下行信道的忙闲状态，提高了频谱利用率，避免仅占用了非授权频段的一部分RB，而导致其他系统检测到信道繁忙而无法传输数据导致频率利用率较低的问题。
而通过设置信道监听子帧对上行信道和/或下行信道的忙闲状态进行检测，使得LTE系统工作在非授权频段时，能够采取相应的干扰避让机制，即能够对上行信道和/或下行信道的状态进行检测，并在检测到信道空闲时传输数据(即在检测到下行信道空闲时，传输下行数据，在检测到上行信道空闲时，通知终端传输上行数据)，在检测到信道繁忙时不传输数据(即在检测到下行信道繁忙时，不传输下行数据，在检测到上行信道繁忙时，通知终端不传输上行数据)，进而使得LTE系统在非授权频段工作时可以与工作在非授权频段的其他系统(如Wi-Fi系统)和平共存，以在确保LTE系统能够在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时由于没有干扰避让机制而对具有干扰避让机制的其他系统产生较大的干扰。
其中，信道监听子帧可以通过以下两种方式检测下行信道和/或上行信道的状态：方式一：周期性地进行检测；方式二：仅在需要传输下行数据和/或上行数据时再进行检测。在一个实施例中，方式二的方案可以如下所述：在需要传输下行数据和/或上行数据时，检测下行信道和/或上行信道的状态，若检测到信道忙，则取一个随机值N，并继续检测，若再次检测确定信道闲，则取N＝N-1，否则N不变，直到N减为0时再发送数据。
此外，上述的下行数据既包括普通的交互数据，也包括控制信令等。本领域的技术人员也应该理解：本发明中所述的具有基站功能的设备包括 宏基站和通过通信设备(如智能手机等)实现的微小区基站等。
在上述技术方案中，优选地，所述设置单元304具体用于：根据所述每个频带的带宽和/或所述每个频带需要传输的信号类型，设置所述每个频带对应的所述判断阈值。
具体地，对于传输某些较重要的信号类型的频带，如传输同步信号的频带，为了避免其他系统占用此类频带，可以将判断阈值设置较低，以使其他系统更容易检测到此类频带内的信道繁忙；而对于较宽的频带，可以适当选用较大的判断阈值，对于较窄的频带，可以适当选用较小的判断阈值。
在上述技术方案中，优选地，所述多个频带中用于传输同步信号的频带对应的所述判断阈值小于所述多个频带中的其他频带对应的所述判断阈值。通过设置用于传输同步信号的频带对应的判断阈值小于其他频带对应的判断阈值，使得其他系统能够更加容易地检测到传输同步信号的频带内的信道繁忙，避免其他系统占用传输同步信号的频带而影响LTE系统传输同步信号。
在上述技术方案中，优选地，所述划分单元302具体用于：将所述非授权频段平均划分为所述多个频带；或将所述非授权频段任意划分为所述多个频带。
具体地，如对于20MHz的非授权频段，可以通过平均划分的方式划分为4个5MHz的频带，也可以通过任意划分的方式划分为5MHz、4.3MHz、1.4MHz、4.3MHz和5MHz的频带。
在上述技术方案中，优选地，还包括：第一通知单元308，用于通知终端在所述多个频带中的指定频带内测量信道质量，并反馈所述指定频带的信道质量测量信息。
具体地，如具有基站功能的设备在通过信道监听子帧检测到某些频带内的信道空闲时，可以通知终端检测这些频带内的空闲信道的信道质量信息并上报，进而根据终端上报的信道质量信息选择合适的信道传输下行数据。
在上述技术方案中，优选地，用于检测所述多个频带中任一频带内的 下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期与用于检测其他频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期相同或不同。
在上述技术方案中，优选地，还包括：第二通知单元310，用于将所述非授权频段的带宽、所述每个频带的带宽和所述每个频带对应的所述判断阈值通知给终端，以供所述终端根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
本发明还提出了一种具有基站功能的设备(图中未示出)，包括：如图3中所示的适用于具有基站功能的设备的LTE系统在非授权频段工作时的信道检测系统300。
图4示出了根据本发明的实施例的适用于终端的LTE系统在非授权频段工作时的信道检测方法的示意流程图。
如图4所示，根据本发明的实施例的适用于终端的LTE系统在非授权频段工作时的信道检测方法，包括：步骤402，接收具有基站功能的设备发送的所述非授权频段的带宽、将所述非授权频段划分为多个频带时每个频带的带宽和所述每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；步骤404，在所述LTE系统的帧结构中设置用于检测所述每个频带内的上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
在该技术方案中，由于非授权频段较宽，因此通过接收具有基站功能的设备发送的非授权频段的带宽、将非授权频段划分为多个频带时每个频带的带宽和每个频带对应的判断阈值，使得LTE终端工作在非授权频带内时，能够分别判断具有基站功能的设备将较宽的非授权频段划分为的多个窄带(即多个频带)的上行信道的忙闲状态，提高了频谱利用率，避免仅占用了非授权频段的一部分RB，而导致其他系统检测到信道繁忙而无法传输数据导致频率利用率较低的问题。
而通过设置信道监听子帧对上行信道的忙闲状态进行检测，使得LTE终端工作在非授权频段时，能够采取相应的干扰避让机制，即能够对上行信道的状态进行检测，并在检测到信道空闲时传输上行数据，在检测到信 道繁忙时不传输上行数据，进而使得LTE终端在非授权频段工作时可以与工作在非授权频段的其他系统(如Wi-Fi系统)和平共存，以在确保LTE系统能够在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时由于没有干扰避让机制而对具有干扰避让机制的其他系统产生较大的干扰。
类似于基站侧的检测方式，终端侧设置的信道监听子帧也可以通过以下两种方式检测上行信道的状态：方式一：周期性地进行检测；方式二：仅在需要传输上行数据时再进行检测。在一个实施例中，方式二的方案可以如下所述：在需要传输上行数据时，检测上行信道的状态，若检测到信道忙，则取一个随机值N，并继续检测，若再次检测确定信道闲，则取N＝N-1，否则N不变，直到N减为0时再发送数据。
图5示出了根据本发明的实施例的适用于终端的LTE系统在非授权频段工作时的信道检测系统的示意框图。
如图5所示，根据本发明的实施例的适用于终端的LTE系统在非授权频段工作时的信道检测系统500，包括：接收单元502，用于接收具有基站功能的设备发送的所述非授权频段的带宽、将所述非授权频段划分为多个频带时每个频带的带宽和所述每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；信道检测单元504，用于在所述LTE系统的帧结构中设置用于检测所述每个频带内的上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
在该技术方案中，由于非授权频段较宽，因此通过接收具有基站功能的设备发送的非授权频段的带宽、将非授权频段划分为多个频带时每个频带的带宽和每个频带对应的判断阈值，使得LTE终端工作在非授权频带内时，能够分别判断具有基站功能的设备将较宽的非授权频段划分为的多个窄带(即多个频带)的上行信道的忙闲状态，提高了频谱利用率，避免仅占用了非授权频段的一部分RB，而导致其他系统检测到信道繁忙而无法传输数据导致频率利用率较低的问题。
而通过设置信道监听子帧对上行信道的忙闲状态进行检测，使得LTE 终端工作在非授权频段时，能够采取相应的干扰避让机制，即能够对上行信道的状态进行检测，并在检测到信道空闲时传输上行数据，在检测到信道繁忙时不传输上行数据，进而使得LTE终端在非授权频段工作时可以与工作在非授权频段的其他系统(如Wi-Fi系统)和平共存，以在确保LTE系统能够在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时由于没有干扰避让机制而对具有干扰避让机制的其他系统产生较大的干扰。
类似于基站侧的检测方式，终端侧设置的信道监听子帧也可以通过以下两种方式检测上行信道的状态：方式一：周期性地进行检测；方式二：仅在需要传输上行数据时再进行检测。在一个实施例中，方式二的方案可以如下所述：在需要传输上行数据时，检测上行信道的状态，若检测到信道忙，则取一个随机值N，并继续检测，若再次检测确定信道闲，则取N＝N-1，否则N不变，直到N减为0时再发送数据。
本发明还提出了一种终端(图中未示出)，包括：如图5所示的适用于终端的LTE系统在非授权频段工作时的信道检测系统500。
具体地，本发明主要针对LAA系统的LBT机制提出了基于窄带甚至基于RB的LBT检测方案，以提高LTE系统在非授权频段工作时的频谱利用率。
具体的方法如下：
一、LBT的执行主体，也就是基站(为便于描述，以下均以基站为例进行阐述，本领域的技术人员需要理解的是基站可以是所有具有基站功能的设备)或终端在进行LBT检测时，对整个非授权频谱带宽上的功率分开接收处理。
具体地，例如一个非授权载波为20MHz的带宽，那么基于窄带的LBT信道状态检测机制的粒度可以是10MHz、5MHz、2.5MHz、或1.25MHz，甚至到RB。
其中，如果要保证发送PSS(Primary Synchronization Signal，主同步信号)/SSS(Secondary Synchronization Signal，辅同步信号)和PBCH(物理广播信道)，那么必须如表1给出的，最小的带宽是1.4MHz，也 就是有6RB必须是空闲的。
信道带宽(MHz) 1.4 3 5 10 15 20
传输带宽配置NRB 6 15 25 50 75 100
表1
同时，LBT信道状态检测机制的粒度可以均匀的，也可以是不均匀的，换句话说，并非一定要把一个20MHz的载波平均分成10个2MHz的窄带，而只要分成的小的载波带宽总和加起来为20MHz即可。例如可以如表2给出的划分方法，低频到高频的带宽依次为5MHz、4.3MHz、1.4MHz、4.3MHz、5MHz，并且低频的5MHz和4.3MHz使用同一个判断阈值(即阈值1)，中间1.4MHz使用一个判断阈值(即阈值2)，高频的5MHz和4.3MHz使用同一个判断阈值(即阈值3)。当然，也可以有其他的划分方法，并且每个窄带可以对应于一个判断阈值。
Figure PCTCN2014096024-appb-000001
表2
此外，对每个窄带的信道忙闲状态判断的阀值也不一样，比如对于表2中所示的中间的1.4MHz，因为是发送PSS/SSS和PBCH，因此这一窄带的阀值要低一些，也就是说检测到周围信号不是特别高时就得判断是忙的状态，以避免该段带宽受到其他系统的干扰。
二、对整个非授权频带的载波带宽分好粒度之后(即划分为多个窄带之后)，LBT执行主体在检测信道状态时，可以对每个粒度分开进行检测。也就是说不同的窄带之间不要进行功率平均，只有每个窄带之内进行功率平均或其它处理。具体地，在获得每个窄带的功率之后，与预定义的每个窄带的信道忙闲状态的判断阀值相比较，以判断每个窄带的忙闲状态，即若某个窄带功率大于阀值，则接下来的一段时间不能占用；若低于阀值，则接下来一段时间可以占用。
三、如果LBT的执行主体是终端，则需要基站提前将非授权频谱的载波带宽和窄带LBT的检测粒度及每个粒度对应的阀值通知给终端。
四、如果LBT的执行主体确认最后只有某些窄带可以使用，那么相关的CQI(Channel Quality Indicator，无线信道质量)反馈可以配置为只需要基于窄带的反馈，具体反馈哪个窄带的CQI，也需要基站通过信令通知给终端。
五、对于每个窄带的LBT的重复周期可以相同，也可以不同。
综上所述，本发明提出了一种基于窄带的LBT检测机制，使得非授权频谱能够更动态更灵活的被不同的接入方式使用，从而提高频谱利用率。
以上结合附图详细说明了本发明的技术方案，本发明提出了一种新的LTE系统在非授权频段工作时的信道检测方案，使得LTE系统工作在非授权频带内时，可以将较宽的非授权频段划分为多个窄带，进而分别判断每个窄带内的信道的忙闲状态，提高了频谱利用率；而通过对信道的忙闲状态进行检测，也使得能够确保LTE系统在非授权频段正常工作的前提下，避免LTE系统在非授权频段工作时对其他系统产生较大的干扰。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (18)

  1. 一种LTE系统在非授权频段工作时的信道检测方法，适用于具有基站功能的设备，其特征在于，包括：
    将所述非授权频段划分为多个频带；
    设置所述多个频带中每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；
    在所述LTE系统的帧结构中设置用于检测所述每个频带内的下行信道状态和/或上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的下行信道和/或上行信道的忙闲状态进行检测。
  2. 根据权利要求1所述的LTE系统在非授权频段工作时的信道检测方法，其特征在于：
    根据所述每个频带的带宽和/或所述每个频带需要传输的信号类型，设置所述每个频带对应的所述判断阈值。
  3. 根据权利要求2所述的LTE系统在非授权频段工作时的信道检测方法，其特征在于，所述多个频带中用于传输同步信号的频带对应的所述判断阈值小于所述多个频带中的其他频带对应的所述判断阈值。
  4. 根据权利要求1所述的LTE系统在非授权频段工作时的信道检测方法，其特征在于，将所述非授权频段划分为多个频带的步骤具体为：
    将所述非授权频段平均划分为所述多个频带；或
    将所述非授权频段任意划分为所述多个频带。
  5. 根据权利要求1所述的LTE系统在非授权频段工作时的信道检测方法，其特征在于，还包括：
    通知终端在所述多个频带中的指定频带内测量信道质量，并反馈所述指定频带的信道质量测量信息。
  6. 根据权利要求1至5中任一项所述的LTE系统在非授权频段工作时的信道检测方法，其特征在于，用于检测所述多个频带中任一频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期与 用于检测其他频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期相同或不同。
  7. 根据权利要求1至5中任一项所述的LTE系统在非授权频段工作时的信道检测方法，其特征在于，还包括：
    将所述非授权频段的带宽、所述每个频带的带宽和所述每个频带对应的所述判断阈值通知给终端，以供所述终端根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
  8. 一种LTE系统在非授权频段工作时的信道检测方法，适用于终端，其特征在于，包括：
    接收具有基站功能的设备发送的所述非授权频段的带宽、将所述非授权频段划分为多个频带时每个频带的带宽和所述每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；
    在所述LTE系统的帧结构中设置用于检测所述每个频带内的上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
  9. 一种LTE系统在非授权频段工作时的信道检测系统，适用于具有基站功能的设备，其特征在于，包括：
    划分单元，用于将所述非授权频段划分为多个频带；
    设置单元，用于设置所述多个频带中每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；
    信道检测单元，用于在所述LTE系统的帧结构中设置用于检测所述每个频带内的下行信道状态和/或上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的下行信道和/或上行信道的忙闲状态进行检测。
  10. 根据权利要求9所述的LTE系统在非授权频段工作时的信道检测系统，其特征在于，所述设置单元具体用于：
    根据所述每个频带的带宽和/或所述每个频带需要传输的信号类型，设置所述每个频带对应的所述判断阈值。
  11. 根据权利要求10所述的LTE系统在非授权频段工作时的信道检 测系统，其特征在于，所述多个频带中用于传输同步信号的频带对应的所述判断阈值小于所述多个频带中的其他频带对应的所述判断阈值。
  12. 根据权利要求9所述的LTE系统在非授权频段工作时的信道检测系统，其特征在于，所述划分单元具体用于：
    将所述非授权频段平均划分为所述多个频带；或
    将所述非授权频段任意划分为所述多个频带。
  13. 根据权利要求9所述的LTE系统在非授权频段工作时的信道检测系统，其特征在于，还包括：
    第一通知单元，用于通知终端在所述多个频带中的指定频带内测量信道质量，并反馈所述指定频带的信道质量测量信息。
  14. 根据权利要求9至13中任一项所述的LTE系统在非授权频段工作时的信道检测系统，其特征在于，用于检测所述多个频带中任一频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期与用于检测其他频带内的下行信道状态和/或上行信道状态的信道监听子帧的检测时间和/或检测周期相同或不同。
  15. 根据权利要求9至13中任一项所述的LTE系统在非授权频段工作时的信道检测系统，其特征在于，还包括：
    第二通知单元，用于将所述非授权频段的带宽、所述每个频带的带宽和所述每个频带对应的所述判断阈值通知给终端，以供所述终端根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
  16. 一种具有基站功能的设备，其特征在于，包括：如权利要求9至15中任一项所述的LTE系统在非授权频段工作时的信道检测系统。
  17. 一种LTE系统在非授权频段工作时的信道检测系统，适用于终端，其特征在于，包括：
    接收单元，用于接收具有基站功能的设备发送的所述非授权频段的带宽、将所述非授权频段划分为多个频带时每个频带的带宽和所述每个频带对应的用于检测所述每个频带内的信道忙闲状态的判断阈值；
    信道检测单元，用于在所述LTE系统的帧结构中设置用于检测所述 每个频带内的上行信道状态的信道监听子帧，并根据所述每个频带对应的所述判断阈值对所述每个频带内的上行信道的忙闲状态进行检测。
  18. 一种终端，其特征在于，包括：如权利要求17所述的LTE系统在非授权频段工作时的信道检测系统。
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