WO2017024915A1 - 一种先听后说方法及装置 - Google Patents

一种先听后说方法及装置 Download PDF

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Publication number
WO2017024915A1
WO2017024915A1 PCT/CN2016/089827 CN2016089827W WO2017024915A1 WO 2017024915 A1 WO2017024915 A1 WO 2017024915A1 CN 2016089827 W CN2016089827 W CN 2016089827W WO 2017024915 A1 WO2017024915 A1 WO 2017024915A1
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Prior art keywords
carrier
primary
carrier set
lbt
channel
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PCT/CN2016/089827
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English (en)
French (fr)
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王加庆
潘学明
徐伟杰
司倩倩
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电信科学技术研究院
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Publication of WO2017024915A1 publication Critical patent/WO2017024915A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • 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

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and apparatus for listening first.
  • the unlicensed spectrum does not have a specific application system, and can be shared by various wireless communication systems such as Bluetooth, WiFi, etc., and the shared unlicensed spectrum resources are used by multiple systems by preempting resources. Therefore, the LTE-U (Unlicensed LTE, Unlicensed LTE, hereinafter referred to as U-LTE or LTE-U; LTE: Long Term Evolution, Long Term Evolution) deployed by different operators and the coexistence of wireless communication systems such as LTE-U and WiFi Sex is a focus and difficulty of research.
  • the 3GPP requires that the wireless coexistence of LTE-U and wireless communication systems such as WiFi be guaranteed.
  • the unlicensed frequency band is used as a secondary carrier to be assisted by the primary carrier of the licensed frequency band. LBT (listen Before Talk), as the basic means of LTE-U competition access, has been endorsed by almost all companies.
  • FIG. 1 is a schematic diagram of the preemption resource mode of WiFi on the unlicensed spectrum.
  • the WiFi system preempts resources on the unlicensed spectrum
  • the channel is first monitored.
  • DIFS DCF Inter-Frame Space, DCF: distributed channel access: distributed channel access
  • DIFS DCF Inter-Frame Space
  • DCF distributed channel access: distributed channel access
  • each site cannot occupy spectrum resources for a long time.
  • resources need to be released for other WiFi or LTE systems to seize resources.
  • FIG. 2a is a schematic diagram of the ETSI FBE channel access mechanism
  • Figure 2b is a schematic diagram of the ETSI LBE option B channel access mechanism
  • Figure 2a, Figure 2a, Figure 2b is a schematic diagram of the ETSI FBE channel access mechanism.
  • the FBE and LBE access mechanisms are as follows:
  • the FBE access performs CCA detection at a fixed frame structure position. As long as the channel has a CCA period (not less than 20us), the channel is immediately accessed and the data transmission process is initiated.
  • the channel transmission time occupation time is relatively fixed, and the minimum time is 1 ms. 10ms, the idle period should be at least 5% of the channel occupancy time, and the device performs a new CCA detection to access the channel again during the CCA time at the end of the idle period.
  • the channel occupation time plus the idle period is a fixed value called frame period.
  • the time and start point of the channel for each transmission are variable, and the extended CCA detection is performed before the channel is acquired.
  • the ETSI LBE is divided into option A and option B.
  • the ETSI option B contention window is fixed and is the most basic LBE form.
  • the competition window will be used in the next competition.
  • LTE-U needs a DIFS-like defer (de) before each ECCA (extended CCA, extended CCA detection) countdown.
  • ECCA extended CCA, extended CCA detection
  • LBT category3 uses a fixed contention window, such as LBEoption B, which belongs to LBT category 3;
  • LBT category 4 is based on ETSI LBEoption B correction, using load-based LBT and the competition window is exponentially increased or semi-statically configured; similar to WiFi
  • LBT category 4 requires a DIEF-like defer before each ECCA countdown.
  • a disadvantage of the prior art is that although the prior art has a scheme of performing LBT on an unlicensed carrier of one LTE-U, when there are multiple carriers in an unlicensed frequency band, there is no technical solution for performing LBT.
  • the present invention provides an LBT method and apparatus for solving the problem that LBT cannot be performed when there is a multi-carrier or multi-carrier set in an unlicensed frequency band.
  • An LBT method is provided in the embodiment of the present invention, including:
  • the LBT operation is performed on the carrier or the carrier set respectively;
  • the LBT operation is performed synchronously on the carrier or carrier set.
  • performing the LBT operation on the carrier or the carrier set separately includes performing LBT operations for uplink or downlink transmission on different carriers or carrier sets.
  • the carrier or the carrier set when the carrier or the carrier set is located in different frequency bands, respectively performing the LBT operation on the carrier or the carrier set, including: performing uplink or downlink transmission on the carrier or the carrier set on different frequency bands respectively. LBT operation;
  • performing the LBT operation on the carrier or the carrier set separately includes: performing LBT operation for uplink or downlink transmission by using a carrier or a carrier set with a distance greater than a preset value between carriers .
  • the method further comprises:
  • the LBT operations for uplink or downlink transmission are separately performed on the carrier sets on the different frequency bands;
  • the LBT operations for uplink or downlink transmission are separately performed on the carrier set.
  • the performing the LBT operation on the carrier or the carrier set synchronously includes:
  • the detection result on the primary carrier when accessing the channel on the primary carrier, if the detection result on the carrier is idle, the primary carrier and the secondary carrier are connected to the channel, and if the detection result on the carrier is busy, the abandonment is performed. Accessing the channel on the primary carrier and the secondary carrier;
  • the detection result on the primary carrier set when accessing the channel on the primary carrier set, if the detection result on the carrier set is idle, accessing the channel on the primary carrier set and the secondary carrier set, if detecting from the carrier set The result is busy, giving up access to the channel on the primary carrier set and the secondary carrier set.
  • the detection performed on the primary carrier or the primary carrier set is ECCA; and/or the detection on the secondary carrier or the secondary carrier set is ICCA.
  • the primary carrier or primary carrier set is determined by one or a combination of the following:
  • Determining a primary carrier or a primary carrier set according to the feedback channel busy/busy information determining a primary carrier or a primary carrier set according to statistical information of the channel busyness, determining a primary carrier or a primary carrier set according to the channel real-time detection information, and randomly selecting the primary carrier or the primary carrier set.
  • An LBT device is provided in the embodiment of the present invention, including:
  • a frequency domain distance determining module configured to determine a frequency domain distance between the carrier and the carrier, or between the carrier set and the carrier set;
  • the LBT operation module is configured to perform an LBT operation on the carrier or the carrier set when the frequency domain distance is greater than the preset value; and perform the LBT operation on the carrier or the carrier set synchronously when the frequency domain distance is less than the preset value.
  • the LBT operation module is further configured to perform an LBT operation for uplink or downlink transmission on different carriers or carrier sets when performing LBT operations on the carrier or the carrier set respectively.
  • the LBT operation module is further configured to perform uplink or downlink on a carrier or a carrier set on different frequency bands when the carrier or the carrier set are respectively located in different frequency bands and respectively perform LBT operation on the carrier or the carrier set.
  • the LBT operation module is further configured to: when the carrier sets are respectively located in different frequency bands, perform LBT operations for uplink or downlink transmission on the carrier sets on different frequency bands respectively; when the carrier sets are in the same frequency band, On the carrier set, the LBT operations for uplink or downlink transmission are separately performed in synchronization.
  • the LBT operation module is further configured to perform LBT operation simultaneously on the carrier or carrier set:
  • the detection result on the primary carrier when accessing the channel on the primary carrier, if the detection result on the carrier is idle, the primary carrier and the secondary carrier are connected to the channel, and if the detection result on the carrier is busy, the abandonment is performed. Accessing the channel on the primary carrier and the secondary carrier;
  • the detection result on the primary carrier set when accessing the channel on the primary carrier set, if the detection result on the carrier set is idle, accessing the channel on the primary carrier set and the secondary carrier set, if detecting from the carrier set The result is busy, giving up access to the channel on the primary carrier set and the secondary carrier set.
  • the LBT operation module is further configured to perform ECCA on the primary carrier or the primary carrier set; and/or to perform ICCA on the secondary carrier or the secondary carrier set.
  • the LBT operation module is further configured to determine the primary carrier or the primary carrier set by one of the following methods or a combination thereof:
  • Determining a primary carrier or a primary carrier set according to the feedback channel busy/busy information determining a primary carrier or a primary carrier set according to statistical information of the busyness of the channel, determining a primary carrier or a primary carrier set according to the channel real-time detection information, and randomly selecting the primary carrier Or a collection of primary carriers.
  • the LBT operation is determined according to the frequency domain distance between the respective carriers or carrier sets, it is solved that there is no multi-carrier in the unlicensed frequency band or When multi-carrier aggregation is performed, the problem of LBT cannot be performed.
  • 1 is a schematic diagram of a method for preempting resources of WiFi on an unlicensed spectrum in the background art
  • FIG. 2a is a schematic diagram of an ETSI FBE channel access mechanism in the background art
  • 2b is a schematic diagram of an ETSI LBE option B channel access mechanism in the background art
  • FIG. 3 is a schematic flowchart of an implementation process of an LBT method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a multi-carrier synchronous LBT according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an LBT device according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a communication device according to an embodiment of the present invention.
  • LTE-U may have multiple idle carriers in the unlicensed frequency band, and multiple carriers may be adjacent or discontinuous, so that a larger bandwidth can be obtained by reusing the LTE carrier aggregation method.
  • LTE-U Similar to WiFi, LTE-U currently has 20M per carrier, and RF (Radio Frequency) leakage must exist in adjacent carriers. If a carrier is transmitting signals, adjacent carriers are idle, due to adjacent channel interference. The result of LBT energy detection is also busy, so each carrier needs to be synchronized for LBT and synchronous transmission.
  • RF Radio Frequency
  • a scheme in which a base station or a terminal accesses multiple carriers in an unlicensed frequency band is proposed.
  • the main reason is that when the frequency domain distance between the carriers or the carrier sets is greater than a preset value, the LBTs performed by the base station or the terminal on the carrier or the carrier set may be independent of each other; when the frequency range between the carriers or the carrier sets is less than a preset value At this time, the base station or the terminal performs the LBT operation synchronously on the carrier or the carrier set, which will be described below.
  • FIG. 3 is a schematic diagram of an implementation process of the LBT method, as shown in the figure, which may include:
  • Step 301 Determine a frequency domain distance between a carrier and a carrier, or between a carrier set and a carrier set.
  • Step 302 Perform LBT operation on a carrier or a carrier set when the frequency domain distance is greater than a preset value; When the domain distance is less than the preset value, the LBT operation is performed synchronously on the carrier or carrier set.
  • the preset value of the frequency domain distance it may be determined by whether the interference between adjacent carriers is lower than a certain threshold. For example, -6 db is usually adopted now, and the specific threshold is determined according to actual needs and The device condition determines that the purpose of determining the frequency domain distance is to determine the degree of interference, and therefore those skilled in the art will readily know how to determine the preset value according to actual conditions.
  • a certain threshold For example, -6 db is usually adopted now, and the specific threshold is determined according to actual needs and The device condition determines that the purpose of determining the frequency domain distance is to determine the degree of interference, and therefore those skilled in the art will readily know how to determine the preset value according to actual conditions.
  • the base station or the terminal first determines the frequency domain distance between the carriers or the carrier sets that need to be LBT, and the carrier or carrier set whose frequency domain distance is greater than the preset distance can perform independent LBT operations respectively, and the frequency domain distance is smaller than The carrier or carrier set of the preset distance synchronizes the LBT operation.
  • performing the LBT operation on the carrier or the carrier set may include performing LBT operations for uplink or downlink transmission on different carriers or carrier sets.
  • the carrier sets on different bands are used for different transmissions respectively, for example, DL is independently performed on different bands (Downlink) (downlink) and UL (Uplink) transmission, at this time, the LBTs on the two bands are independent of each other, that is, when the carrier or the carrier set is respectively located in different frequency bands, in the carrier or carrier
  • Performing LBT operations on the set separately may include performing LBT operations for uplink or downlink transmission on carriers or carrier sets on different frequency bands.
  • an LBT primary carrier may be configured on each band, and each band independently performs an LBT operation according to the configured LBT primary carrier.
  • different carriers or carrier sets may be used for DL and UL transmission respectively.
  • whether the distance between the carrier or the carrier set can be independently LBT operation can be used.
  • the frequency domain distance between the carriers or the nearest two of the two carrier sets is measured, although other methods are also possible.
  • a plurality of carrier sets that can be used for independent LBTs can be determined according to the distance between the measurement carriers and the preset frequency domain distance, and the base station or the terminal can separately perform independent LBTs on the carrier sets for DL or UL transmission, for example,
  • the DL transmission in one band configures one DL LBT primary carrier, and one UL LBT primary carrier is configured for UL transmission for DL and UL independent LBT.
  • performing LBT operations on the carrier or the carrier set respectively may include: performing carrier or carrier set with a distance greater than a preset value between carriers for uplink or downlink transmission respectively. LBT operation.
  • the base station or the terminal performs LBT aggregation into a larger bandwidth on the carrier sets satisfying the frequency domain distance greater than the preset value, for example, on two bands, each band according to its respective LBT.
  • the primary carrier synchronizes with LBT, and the two LBT primary carriers also maintain synchronization, and aggregate into a large bandwidth on each band. If two band-aggregated carriers are synchronized to access the channel, they are aggregated into a larger bandwidth across the band. If the two band-aggregated carriers cannot maintain the synchronous access channel, they are independently transmitted. That is, when the carrier sets are respectively located in different frequency bands, the LBT operations for uplink or downlink transmission are separately performed on the carrier sets on different frequency bands.
  • the LBT operation for uplink or downlink transmission may be separately performed on the carrier set. Specifically, when the distance between the carrier sets is greater than a preset value, the LBT can be independently performed. If the carrier sets of the two ends satisfy the condition of independently performing LBT in one band, the synchronous LBT mode can also be adopted.
  • the base station or the terminal may perform LBT synchronously on the carrier or carrier set that satisfies the condition. That is, the LBT operation is performed synchronously on the carrier or carrier set, including:
  • the detection result on the primary carrier when accessing the channel on the primary carrier, if the detection result on the carrier is idle, the primary carrier and the secondary carrier are connected to the channel, and if the detection result on the carrier is busy, the abandonment is performed. Accessing the channel on the primary carrier and the secondary carrier;
  • the detection result on the primary carrier set when accessing the channel on the primary carrier set, if the detection result on the carrier set is idle, accessing the channel on the primary carrier set and the secondary carrier set, if detecting from the carrier set The result is busy, giving up access to the channel on the primary carrier set and the secondary carrier set.
  • the primary carrier and the secondary carrier when determining the primary carrier and the secondary carrier, it refers to determining the master-slave relationship from each carrier or carrier set, and does not refer to the primary carrier and the secondary carrier in the LTE-U, because generally, those skilled in the art It is considered that the primary carrier in the LTE-U refers to the LTE carrier of the licensed frequency band, and all carriers in the unlicensed frequency band are the secondary carriers.
  • the scheme for the base station or the terminal to perform the LBT synchronously may be as follows:
  • the network or the base station or the terminal is an unlicensed frequency band, and the carrier set of the LBT needs to be synchronized to configure a primary carrier for performing the LBT, and the primary carrier or the primary carrier set is determined by one of the following methods or a combination thereof: the busy/busy information according to the feedback channel Determining a primary carrier or a primary carrier set, determining a primary carrier or a primary carrier set according to statistical information of the channel busyness, determining a primary carrier or a primary carrier set according to the channel real-time detection information, and randomly selecting a primary carrier or a primary carrier set.
  • the base station or the terminal generates, on the LBT primary carrier, a slot that needs to be randomly backed off or a number of idle CCA slots that need to be detected according to a fixed contention window, or a dynamically expanded contention window, or a semi-statically configured contention window.
  • the non-LBT primary carrier does not perform random backoff before the LBT primary carrier accesses the channel, does not perform ECCA detection, and only performs ICCA (Initial CCA, initial CCA) detection, if the non-LBT primary carrier is in the LBT
  • ICCA detection result is idle, and the non-LBT primary carrier accesses the channel together with the LBT primary carrier. If the ICCA result is busy, the access channel is abandoned.
  • the length of the time slot that the ICCA needs to detect is configurable. of.
  • the access mode of the LBT primary carrier and the LBT secondary carrier in the foregoing embodiment is only an example, but the combination of other access modes is not excluded, for example, the LBT category 4 access mode is adopted on the LBT primary carrier.
  • the LBT category 3 access method is adopted on the LBT secondary carrier.
  • the primary carrier for performing the LBT configured in the foregoing embodiment is one, but the solution of the present application is not only applicable to limiting the LBT primary carrier in the same band to one, and may also adopt multiple in the implementation.
  • At least DL and UL may use different LBT primary carriers respectively, and the downlink may also be configured as multiple downlink LBT primary carriers as needed, and in practice, the method in the embodiment may be adopted when the frequency domain distance is exceeded.
  • FIG 4 is a schematic diagram of multi-carrier synchronous LBT. As shown in the figure, 20M LBT carriers are randomly based on the contention window. A backoff is generated, and the ECCA detection process is started. Once the LBT is successful, the channel is accessed, and other non-LBT LTE-U carriers only perform ICCA detection, and whether the channel is accessed according to the ICCA detection result.
  • Figure 4 is only a multi-carrier synchronous LBT example, and does not exclude other multi-carrier synchronous LBT. In Figure 4, the LBT primary carrier uses a load-based LBT, and does not exclude frame based LBT or other LBT methods that randomly fall back to a fixed value.
  • an LBT device is also provided in the embodiment of the present invention. Since the principle of solving the problem is similar to that of the LBT method, the implementation of the device can be referred to the implementation of the method, and the repeated description is not repeated.
  • FIG. 5 is a schematic structural diagram of an LBT device. As shown in the figure, the device may include:
  • the frequency domain distance determining module 501 is configured to determine a frequency domain distance between the carrier and the carrier, or between the carrier set and the carrier set;
  • the LBT operation module 502 is configured to perform an LBT operation on a carrier or a carrier set when the frequency domain distance is greater than a preset value, and perform an LBT operation on the carrier or the carrier set synchronously when the frequency domain distance is less than a preset value.
  • the LBT operation module may be further configured to perform an LBT operation for uplink or downlink transmission on different carriers or carrier sets when performing LBT operations on the carrier or the carrier set respectively.
  • the LBT operation module may be further configured to perform uplink or uplink on a carrier or a carrier set on different frequency bands when the carrier or the carrier set are respectively located in different frequency bands and respectively perform LBT operation on the carrier or the carrier set.
  • the LBT operation of the downlink transmission; when the carrier or the carrier set is located in the same frequency band, and the LBT operation is performed on the carrier or the carrier set respectively, the carrier or the carrier set whose distance between the carriers is greater than the preset value is respectively used for uplink or downlink transmission. LBT operation.
  • the LBT operation module may be further configured to synchronously perform LBT operations for uplink or downlink transmission on a set of carriers on different frequency bands when the carrier sets are respectively located in different frequency bands; when the carrier sets are in the same frequency band, On the carrier set, the LBT operations for uplink or downlink transmission are separately performed in synchronization.
  • the LBT operation module may further be used to perform LBT operation synchronously on a carrier or a carrier set:
  • the detection result on the primary carrier when accessing the channel on the primary carrier, if the detection result on the carrier is idle, the primary carrier and the secondary carrier are connected to the channel, and if the detection result on the carrier is busy, the abandonment is performed. Accessing the channel on the primary carrier and the secondary carrier;
  • the detection result on the primary carrier set when accessing the channel on the primary carrier set, if the detection result on the carrier set is idle, accessing the channel on the primary carrier set and the secondary carrier set, if detecting from the carrier set The result is busy, giving up access to the channel on the primary carrier set and the secondary carrier set.
  • the LBT operation module may further be configured to perform ECCA on the primary carrier or the primary carrier set; and/or perform ICCA on the secondary carrier or the secondary carrier set.
  • the LBT operation module may be further configured to determine a primary carrier or a primary carrier set by one of the following methods or a combination thereof:
  • Determining a primary carrier or a primary carrier set according to the feedback channel busy/busy information determining a primary carrier or a primary carrier set according to statistical information of the channel busyness, determining a primary carrier or a primary carrier set according to the channel real-time detection information, and randomly selecting the primary carrier or the primary carrier set.
  • FIG. 6 is a schematic structural diagram of a communication device. As shown in the figure, the communication device may include:
  • the processor 600 is configured to read a program in the memory 620 and perform the following process:
  • the transceiver 610 is configured to send data under the control of the processor 600, and performs the following processes:
  • the LBT operation is performed on the carrier or the carrier set respectively;
  • the LBT operation is performed synchronously on the carrier or carrier set.
  • the LBT operation is performed on the carrier or the carrier set, respectively, including: on different carriers or carrier sets
  • the LBT operation for uplink or downlink transmission is performed separately.
  • the LBT operation is performed on the carrier or the carrier set, respectively, including: performing LBT for uplink or downlink transmission on a carrier or a carrier set on different frequency bands respectively operating;
  • performing the LBT operation on the carrier or the carrier set separately includes: performing LBT operation for uplink or downlink transmission by using a carrier or a carrier set with a distance greater than a preset value between carriers .
  • it further includes:
  • the LBT operations for uplink or downlink transmission are separately performed on the carrier sets on the different frequency bands;
  • the LBT operations for uplink or downlink transmission are separately performed on the carrier set.
  • the performing the LBT operation on the carrier or the carrier set including:
  • the detection result on the primary carrier when accessing the channel on the primary carrier, if the detection result on the carrier is idle, the primary carrier and the secondary carrier are connected to the channel, and if the detection result on the carrier is busy, the abandonment is performed. Accessing the channel on the primary carrier and the secondary carrier;
  • the detection result on the primary carrier set when accessing the channel on the primary carrier set, if the detection result on the carrier set is idle, accessing the channel on the primary carrier set and the secondary carrier set, if detecting from the carrier set The result is busy, giving up access to the channel on the primary carrier set and the secondary carrier set.
  • the detection on the primary carrier or primary carrier set is an extended idle channel assessment ECCA; and/or the detection on the secondary carrier or the secondary carrier set is the initial idle channel assessment ICCA.
  • the primary carrier or the primary carrier set is determined by one of the following methods or a combination thereof:
  • Determining a primary carrier or a primary carrier set according to the feedback channel busy/busy information determining a primary carrier or a primary carrier set according to statistical information of the channel busyness, determining a primary carrier or a primary carrier set according to the channel real-time detection information, and randomly selecting the primary carrier or the primary carrier set.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 600 and various circuits of memory represented by memory 620.
  • Bus architecture Various other circuits, such as peripherals, voltage regulators, power management circuits, and the like, can be linked together, as is well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 610 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 can store data used by the processor 600 in performing operations.
  • the synchronous LBT needs to be performed for the adjacent carrier, and a multi-layer is proposed.
  • the carrier LBT scheme performs synchronous LBT for adjacent carriers in the same band, and independently performs LBT for carrier sets that are far in the frequency domain and respectively belong to two bands.
  • the technical solution provided by the embodiment of the present invention is a scheme for performing LBT on multiple carriers of an LTE system on an unlicensed spectrum.
  • the solution can effectively ensure that multiple carriers can be aggregated in a simple manner, so that carriers in different bands can independently perform LBT for DL and UL transmission, respectively.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

Abstract

本发明公开了一种先听后说方法及装置，包括：确定载波与载波之间，或载波集合与载波集合之间的频域距离；在频域距离大于预设值时，在载波或载波集合上分别进行先听后说操作；在频域距离小于预设值时，在载波或载波集合上同步进行先听后说操作。本发明解决了现有技术中不存在当非授权频段有多载波或多载波集合时，不能进行先听后说的问题。

Description

一种先听后说方法及装置
本申请要求在2015年8月7日提交中国专利局、申请号为201510483745.2、发明名称为“一种先听在说方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信技术领域，特别涉及一种先听后说方法及装置。
背景技术
非授权频谱没有规划具体的应用系统，可以为多种无线通信系统如蓝牙、WiFi等共享，多种系统间通过抢占资源的方式使用共享的非授权频谱资源。故不同运行商部署的LTE-U(Unlicensed LTE，非授权LTE，简称为U-LTE或者LTE-U；LTE：Long Term Evolution，长期演进)间及其LTE-U与WiFi等无线通信系统的共存性是研究的一个重点与难点。3GPP要求保证LTE-U与WiFi等无线通信系统的公平共存，非授权频段作为辅载波由授权频段的主载波辅助实现。LBT(listen Before Talk，先听后说)作为LTE-U竞争接入的基本手段，得到几乎所有公司的赞同。
802.11系统采用信道接入机制称为CSMA/CA(Carrier Sense Multiple Access/Collision Avoidance，载波监听多址接入/冲突避免)机制，图1为WiFi在非授权频谱上的抢占资源方式示意图，如图所示，WiFi系统在非授权频谱上抢占资源时，首先对信道进行监听，当信道空闲时间达到DIFS(DCF Inter-Frame Space，DCF帧间距；DCF:distributed channel access:分布式信道接入)，便判断当前信道为空闲信道，然后各个等待接入的信道的站点，便进入一个随机回退阶段，用于避免多个站点在相同的资源发生碰撞。此外，为了保证公平性，还规定每个站点不能长期占用频谱资源，到达一定时间或数据传输量上限时，需要释放资源，以供其他WiFi或LTE系统抢占资源。
为了提供一个灵活、公平的自适应信道接入机制，欧洲要求在非授权的5150-5350MHz与5470-5725MHz频段采用LBT技术，LBT过程类似于WiFi的CSMA/CA机制，每个设备利用信道之前要进行CCA(Clear Channel Assessment，空闲信道评估)检测。CCA利用能量检测来判断当前信道是否有信号传输，进而确定信道是否被占用。ETSI(European Telecommunications Standards Institute，欧洲电信标准学会)标准将非授权频段的设备分类为frame-based(基于帧的)与load-based(基于负载的)，分别对应两类接入机制：FBE(Frame Based Equipment，基于帧的设备)与LBE(Load Based Equipment，基于负载的设备)，图2a为ETSI FBE信道接入机制示意图，图2b为ETSI LBE option B信道接入机制示意图，如图2a，图2b所示，FBE、LBE接入机制如下：
FBE接入在固定的帧结构位置执行CCA检测，只要信道有一个CCA周期(不低于20us)判断为空就立刻接入信道，发起数据传输过程，信道传输时间占用时间相对固定，最小1ms最大10ms，空闲周期应该至少为信道占用时间的5％，在空闲周期的尾部的CCA时间内设备执行新的CCA检测再次接入信道。在FBE机制中信道占用时间加idle(空闲)周期是一个固定值称为frame period(帧周期)。
在LBE信道接入机制中，每次传输对信道的占用时间与起点都是可变的，在获取信道之前要进行扩展CCA检测，首先根据CW(contention window，竞争窗口)的大小q，产生一个随机的因子N，直到信道空闲时间达到CCA时间的N倍，且信道为闲，才接入信道，发起数据传输过程，最大的信道占用时间为13ms。ETSI LBE分为option A与option B两种选项，其中ETSI option B竞争窗口是固定的，是最基本的LBE形式。
WiFi采用CSMA/CA接入机制时采用竞争窗口指数扩大的方式，最小的CW设为15＝24-1个时隙，当两个站点的传输发生碰撞后，下次竞争时便会将竞争窗口加倍扩大为31＝25-1，CW最大可为1023。为了实现LTE-U与WiFi的公平共存，当采用基于LBE的LBT机制时，目前3GPP的研究结论为，对下行传输LBT，应基于ETSI LBE option B修正，应该采用基于load的LBT而且竞争窗口是指数增加的或者半静态配置的，类似于WiFi的DIFS间隔，LTE-U每次启动ECCA(extended CCA，扩展CCA检测)倒计时之前都需要有一个类似于DIFS的defer(延迟)。上述讨论都是基于在一个LTE-U的非授权载波上进行LBT。
目前3GPP的研究现状为，针对基于load的传输定义了两类LBT，称为LBT category3与LBT category 4。LBT category 3采用固定的竞争窗口，如LBEoption B就属于LBT category 3；而LBT category 4是基于ETSI LBEoption B修正，采用基于load的LBT而且竞争窗口是指数增加的或者半静态配置的；类似于WiFi的DIFS间隔，LBT category 4每次启动ECCA倒计时之前都需要有一个类似于DIFS的defer。
现有技术的不足在于：虽然现有技术有在一个LTE-U的非授权载波上进行LBT的方案，但是当非授权频段有多个载波时没有进行LBT的技术方案。
发明内容
本发明提供了一种LBT方法及装置，用以解决当非授权频段有多载波或多载波集合时，不能进行LBT的问题。
本发明实施例中提供了一种LBT方法，包括：
确定载波与载波之间，或载波集合与载波集合之间的频域距离；
在频域距离大于预设值时，在载波或载波集合上分别进行LBT操作；
在频域距离小于预设值时，在载波或载波集合上同步进行LBT操作。
较佳地，在载波或载波集合上分别进行LBT操作，包括：在不同的载波或者载波集合上分别进行用于上行或下行传输的LBT操作。
较佳地，在载波或者载波集合分别位于不同的频段时，所述在载波或载波集合上分别进行LBT操作，包括：在不同频段上的载波或者载波集合上分别进行用于上行或下行传输的LBT操作；
在载波或者载波集合位于同一频段时，所述在载波或载波集合上分别进行LBT操作，包括：将载波间的距离大于预设值的载波或者载波集合分别进行用于上行或下行传输的LBT操作。
较佳地，进一步包括：
在载波集合分别位于不同的频段时，在不同频段上的载波集合上，同步分别进行用于上行或下行传输的LBT操作；
在载波集合位于同一频段时，在载波集合上，同步分别进行用于上行或下行传输的LBT操作。
较佳地，所述在载波或载波集合上同步进行LBT操作，包括：
在各载波中确定主载波与从载波；
在主载波上进行一种接入方式的检测，在从载波上进行另一种接入方式的检测；
根据主载波上的检测结果，在主载波上接入信道时，若从载波上的检测结果为闲，在主载波与从载波上接入信道，若从载波上的检测结果为忙，放弃在主载波与从载波上接入信道；
或，
在各载波集合中确定主载波集合与从载波集合；
在主载波集合上进行一种接入方式的检测，在从载波集合上进行另一种接入方式的检测；
根据主载波集合上的检测结果，在主载波集合上接入信道时，若从载波集合上的检测结果为闲，在主载波集合与从载波集合上接入信道，若从载波集合上的检测结果为忙，放弃在主载波集合与从载波集合上接入信道。
较佳地，在主载波或主载波集合上进行的检测为ECCA；和/或，在从载波或从载波集合上进行的检测为ICCA。
较佳地，通过下述方式之一或者其组合确定主载波或主载波集合：
根据反馈信道忙/闲信息确定主载波或主载波集合、根据信道繁忙程度的统计信息确定主载波或主载波集合、根据信道实时检测信息确定主载波或主载波集合、随机选择主载波或主载波集合。
本发明实施例中提供了一种LBT装置，包括：
频域距离确定模块，用于确定载波与载波之间，或载波集合与载波集合之间的频域距离；
LBT操作模块，用于在频域距离大于预设值时，在载波或载波集合上分别进行LBT操作；在频域距离小于预设值时，在载波或载波集合上同步进行LBT操作。
较佳地，LBT操作模块进一步用于在载波或载波集合上分别进行LBT操作时，在不同的载波或者载波集合上分别进行用于上行或下行传输的LBT操作。
较佳地，LBT操作模块进一步用于在载波或者载波集合分别位于不同的频段，在载波或载波集合上分别进行LBT操作时，在不同频段上的载波或者载波集合上分别进行用于上行或下行传输的LBT操作；在载波或者载波集合位于同一频段，在载波或载波集合上分别进行LBT操作时，将载波间的距离大于预设值的载波或者载波集合分别进行用于上行或下行传输的LBT操作。
较佳地，LBT操作模块进一步用于在载波集合分别位于不同的频段时，在不同频段上的载波集合上，同步分别进行用于上行或下行传输的LBT操作；在载波集合位于同一频段时，在载波集合上，同步分别进行用于上行或下行传输的LBT操作。
较佳地，LBT操作模块进一步用于在载波或载波集合上同步进行LBT操作时：
在各载波中确定主载波与从载波；
在主载波上进行一种接入方式的检测，在从载波上进行另一种接入方式的检测；
根据主载波上的检测结果，在主载波上接入信道时，若从载波上的检测结果为闲，在主载波与从载波上接入信道，若从载波上的检测结果为忙，放弃在主载波与从载波上接入信道；
或，
在各载波集合中确定主载波集合与从载波集合；
在主载波集合上进行一种接入方式的检测，在从载波集合上进行另一种接入方式的检测；
根据主载波集合上的检测结果，在主载波集合上接入信道时，若从载波集合上的检测结果为闲，在主载波集合与从载波集合上接入信道，若从载波集合上的检测结果为忙，放弃在主载波集合与从载波集合上接入信道。
较佳地，LBT操作模块进一步用于在主载波或主载波集合上进行ECCA；和/或，在从载波或从载波集合上进行ICCA。
较佳地，LBT操作模块进一步用于通过下述方式之一或者其组合确定主载波或主载波集合：
根据反馈信道忙/闲信息确定主载波或主载波集合、根据信道繁忙程度的统计信息确定主载波或主载波集合、根据信道实时检测信息确定主载波或主载波集合、随机选择主载波 或主载波集合。
本发明有益效果如下：
在本发明实施例提供的技术方案中，由于根据各个载波或载波集合之间的频域距离，来确定如何进行LBT操作，因此，解决了现有技术中不存在当非授权频段有多载波或多载波集合时，不能进行LBT的问题。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本发明的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1为背景技术中WiFi在非授权频谱上的抢占资源方式示意图；
图2a为背景技术中ETSI FBE信道接入机制示意图；
图2b为背景技术中ETSI LBE option B信道接入机制示意图；
图3为本发明实施例中LBT方法实施流程示意图；
图4为本发明实施例中多载波同步LBT示意图；
图5为本发明实施例中LBT装置结构示意图；
图6为本发明实施例中通信设备结构示意图。
具体实施方式
下面结合附图对本发明的具体实施方式进行说明。
发明人在发明过程中注意到，虽然现有技术有了基于一个LTE-U的非授权载波上进行LBT的方案，但是当非授权频段有多个载波时没有进行LBT的技术方案。然而，LTE-U在非授权频段可能存在多个空闲载波，多个载波可以是相邻的也可以是不连续的，那么就可以通过重用LTE载波聚合的方法获得更大的带宽。
类似于WiFi，目前LTE-U每个载波为20M，相邻载波必然存在RF(Radio Frequency，射频)泄露，若一个载波正在发送信号，相邻的载波即使是处于空闲状态，由于邻信道干扰，LBT能量检测的结果也为忙，因此需要各个载波同步进行LBT，同步传输。
基于此，本发明实施例中提出了一种在非授权频段，基站或者终端接入多个载波的方案。主要为：载波间或者载波集合间的频域距离大于预设值时，基站或者终端在载波或载波集上进行的LBT可以是互相独立；当载波间或者载波集合间频域距离小于预设值时，基站或者终端在此载波或者载波集合上同步进行LBT操作，下面进行说明。
图3为LBT方法实施流程示意图，如图所示，可以包括：
步骤301、确定载波与载波之间，或载波集合与载波集合之间的频域距离；
步骤302、在频域距离大于预设值时，在载波或载波集合上分别进行LBT操作；在频 域距离小于预设值时，在载波或载波集合上同步进行LBT操作。
实施中，在确定频域距离的预设值时，可以通过相邻载波之间的干扰是否低于某个门限来确定，例如，现在通常采用的-6db，具体门限为多少需要视实际需要以及设备情况确定，确定频域距离的目的在于确定干扰的程度，因此本领域技术人员容易知晓如何根据实际情况确定该预设值。
实施中，基站或者终端首先确定需要进行LBT的载波之间或者载波集合之间的频域距离，频域距离大于预设距离的载波或者载波集合可以分别进行独立的LBT操作，而频域距离小于预设距离的载波或载波集合则同步进行LBT操作。
为更好地理解，下面以实例进行说明。
实施例1
本例中，在载波或载波集合上分别进行LBT操作，可以包括：在不同的载波或者载波集合上分别进行用于上行或下行传输的LBT操作。
具体的，在进行载波或者载波集合的距离度量时，若两个载波或者两个载波集分别位于两个band(频段)，特别是两个不相邻的band，例如，一个在2.4G频段，一个在5G频段，此时载波或者载波集合间的距离远大于频域距离的预设值，则将不同的band上的载波集合分别用于不同的传输，如在不同band上独立进行DL(Downlink，下行链路)与UL(Uplink，上行链路)传输，此时这两个band上的LBT即是相互独立的，也即：在载波或者载波集合分别位于不同的频段时，在载波或载波集合上分别进行LBT操作，可以包括：在不同频段上的载波或者载波集合上分别进行用于上行或下行传输的LBT操作。具体实施时，可在每个band上配置LBT主载波，每个band根据所配置的LBT主载波独立进行LBT操作。
若多个载波或者载波集位于同一个band内，可能需要不同的载波或者载波集合分别用于DL与UL传输，此时在判断载波或载波集合间的距离是否可以独立进行LBT操作，可以用两个载波或者两个载波集合距离中最近的两个之间的频域距离来度量，当然也可以采用其它方式。可以根据测量载波间的距离与预设频域距离确定多个可以用于独立LBT的载波集合，基站或者终端可以分别在这些载波集合上进行独立的LBT，用于DL或者UL传输，如可为一个band内的DL传输配置一个DL LBT主载波，为UL传输配置一个UL LBT主载波分别用于DL与UL独立进行LBT。也即，在载波或者载波集合位于同一频段时，在载波或载波集合上分别进行LBT操作，可以包括：将载波间的距离大于预设值的载波或者载波集合分别进行用于上行或下行传输的LBT操作。
具体实施中，并不排除基站或者终端在这些满足频域距离大于预设值的载波集合上同步进行LBT聚合成一个更大的带宽，如在两个band上，每个band根据其各自的LBT主载波同步进行LBT，且两个LBT主载波也保持同步，在每个band上聚合成一个大的带宽， 若两个band聚合的载波同步接入信道，就跨band聚合成一个更大的带宽，若两个band聚合的载波不能保持同步接入信道，就分别独立传输。也即，在载波集合分别位于不同的频段时，在不同频段上的载波集合上，同步分别进行用于上行或下行传输的LBT操作。
实施中，在载波集合位于同一频段时，也可以在载波集合上，同步分别进行用于上行或下行传输的LBT操作。具体的，在载波集合间距离大于预设值时可以LBT独立进行，如果在一个band内，两头的载波集合满足独立进行LBT的条件时，同样也可以采用同步LBT的方式。
实施例2
本例中，当载波或者载波集合间频域距离小于预设值时，基站或者终端可以在满足条件的载波或载波集合同步进行LBT。也即，在载波或载波集合上同步进行LBT操作，包括：
在各载波中确定主载波与从载波；
在主载波上进行一种接入方式的检测，在从载波上进行另一种接入方式的检测；
根据主载波上的检测结果，在主载波上接入信道时，若从载波上的检测结果为闲，在主载波与从载波上接入信道，若从载波上的检测结果为忙，放弃在主载波与从载波上接入信道；
或，
在各载波集合中确定主载波集合与从载波集合；
在主载波集合上进行一种接入方式的检测，在从载波集合上进行另一种接入方式的检测；
根据主载波集合上的检测结果，在主载波集合上接入信道时，若从载波集合上的检测结果为闲，在主载波集合与从载波集合上接入信道，若从载波集合上的检测结果为忙，放弃在主载波集合与从载波集合上接入信道。
实施中，在确定主载波与从载波时，是指的从各载波或载波集合中中确定主从关系，并非是指LTE-U中的主载波与辅载波，这是因为通常本领域技术人员认为LTE-U中的主载波指的是授权频段的LTE载波，非授权频段的所有载波为辅载波。
具体实施中，基站或者终端同步进行LBT的方案可以如下：
网络或者基站或者终端为非授权频段需要同步进行LBT的载波集合配置一个用于进行LBT的主载波，通过下述方式之一或者其组合确定主载波或主载波集合：根据反馈信道忙/闲信息确定主载波或主载波集合、根据信道繁忙程度的统计信息确定主载波或主载波集合、根据信道实时检测信息确定主载波或主载波集合、随机选择主载波或主载波集合。
基站或者终端在该LBT主载波上，根据固定竞争窗口，或者动态扩大的竞争窗口，或者半静态配置的竞争窗口，产生需要随机回退的时隙或者需要检测的空闲CCA时隙个数， 在LBT主载波上进行ECCA检测，非LBT主载波在LBT主载波接入信道之前不进行随机回退，不执行ECCA检测，只进行ICCA(Initial CCA，初始CCA)检测，若非LBT主载波在LBT主载波接入信道时，ICCA检测结果为闲，非LBT主载波就与LBT主载波一起接入信道，若ICCA结果为忙就放弃本次接入信道，ICCA需要检测的时隙长度是可以配置的。
实施中，上述实施例中的LBT主载波与LBT辅载波的接入方式只是一个实例，但并不排除使用其他接入方式的组合，例如，在LBT主载波上采用LBT category 4的接入方式，而在LBT辅载波上采用LBT category 3的接入方式。
实施中，上述实施例中配置的用于进行LBT的主载波是一个，但是本申请的方案并不仅仅只适用于将同一个band内的LBT主载波限制为一个，实施中也可以采用多个，至少DL与UL可以分别采用不同的LBT主载波，同为下行也可以视情况和需要配置为多个下行LBT主载波，实施中，超过频域距离就可以用采用实施例中的方式。
多个载波需要同步进行LBT，主要目的既能增加聚合带宽，又可以避免相邻或者相近信道RF泄露干扰LBT，图4为多载波同步LBT示意图，如图所示，20M LBT载波根据竞争窗口随机产生backoff(回退)，开始ECCA检测过程，一旦LBT成功即接入信道，而其它非LBT LTE-U载波只进行ICCA检测，根据ICCA检测结果决定是否接入信道。图4只是一个多载波同步LBT实例，并不排除其它多载波同步LBT。在图4中LBT主载波采用的是基于load的LBT，并不排除frame based LBT或者随机回退为固定值的其它LBT方式。
基于同一发明构思，本发明实施例中还提供了一种LBT装置，由于该装置解决问题的原理与一种LBT方法相似，因此该装置的实施可以参见方法的实施，重复之处不再赘述。
图5为LBT装置结构示意图，如图所示，装置中可以包括：
频域距离确定模块501，用于确定载波与载波之间，或载波集合与载波集合之间的频域距离；
LBT操作模块502，用于在频域距离大于预设值时，在载波或载波集合上分别进行LBT操作；在频域距离小于预设值时，在载波或载波集合上同步进行LBT操作。
实施中，LBT操作模块还可以进一步用于在载波或载波集合上分别进行LBT操作时，在不同的载波或者载波集合上分别进行用于上行或下行传输的LBT操作。
实施中，LBT操作模块还可以进一步用于在载波或者载波集合分别位于不同的频段，在载波或载波集合上分别进行LBT操作时，在不同频段上的载波或者载波集合上分别进行用于上行或下行传输的LBT操作；在载波或者载波集合位于同一频段，在载波或载波集合上分别进行LBT操作时，将载波间的距离大于预设值的载波或者载波集合分别进行用于上行或下行传输的LBT操作。
实施中，LBT操作模块还可以进一步用于在载波集合分别位于不同的频段时，在不同频段上的载波集合上，同步分别进行用于上行或下行传输的LBT操作；在载波集合位于同一频段时，在载波集合上，同步分别进行用于上行或下行传输的LBT操作。
实施中，LBT操作模块还可以进一步用于在载波或载波集合上同步进行LBT操作时：
在各载波中确定主载波与从载波；
在主载波上进行一种接入方式的检测，在从载波上进行另一种接入方式的检测；
根据主载波上的检测结果，在主载波上接入信道时，若从载波上的检测结果为闲，在主载波与从载波上接入信道，若从载波上的检测结果为忙，放弃在主载波与从载波上接入信道；
或，
在各载波集合中确定主载波集合与从载波集合；
在主载波集合上进行一种接入方式的检测，在从载波集合上进行另一种接入方式的检测；
根据主载波集合上的检测结果，在主载波集合上接入信道时，若从载波集合上的检测结果为闲，在主载波集合与从载波集合上接入信道，若从载波集合上的检测结果为忙，放弃在主载波集合与从载波集合上接入信道。
实施中，LBT操作模块还可以进一步用于在主载波或主载波集合上进行ECCA；和/或，在从载波或从载波集合上进行ICCA。
实施中，LBT操作模块还可以进一步用于通过下述方式之一或者其组合确定主载波或主载波集合：
根据反馈信道忙/闲信息确定主载波或主载波集合、根据信道繁忙程度的统计信息确定主载波或主载波集合、根据信道实时检测信息确定主载波或主载波集合、随机选择主载波或主载波集合。
为了描述的方便，以上所述装置的各部分以功能分为各种模块或单元分别描述。当然，在实施本发明时可以把各模块或单元的功能在同一个或多个软件或硬件中实现。
在实施本发明实施例提供的技术方案时，可以按如下方式实施。
图6为通信设备结构示意图，如图所示，通信设备中可以包括：
处理器600，用于读取存储器620中的程序，执行下列过程：
确定载波与载波之间，或载波集合与载波集合之间的频域距离；
收发机610，用于在处理器600的控制下发送数据，执行下列过程：
在频域距离大于预设值时，在载波或载波集合上分别进行LBT操作；
在频域距离小于预设值时，在载波或载波集合上同步进行LBT操作。
实施中，在载波或载波集合上分别进行LBT操作，包括：在不同的载波或者载波集合 上分别进行用于上行或下行传输的LBT操作。
实施中，在载波或者载波集合分别位于不同的频段时，所述在载波或载波集合上分别进行LBT操作，包括：在不同频段上的载波或者载波集合上分别进行用于上行或下行传输的LBT操作；
在载波或者载波集合位于同一频段时，所述在载波或载波集合上分别进行LBT操作，包括：将载波间的距离大于预设值的载波或者载波集合分别进行用于上行或下行传输的LBT操作。
实施中，进一步包括：
在载波集合分别位于不同的频段时，在不同频段上的载波集合上，同步分别进行用于上行或下行传输的LBT操作；
在载波集合位于同一频段时，在载波集合上，同步分别进行用于上行或下行传输的LBT操作。
实施中，所述在载波或载波集合上同步进行LBT操作，包括：
在各载波中确定主载波与从载波；
在主载波上进行一种接入方式的检测，在从载波上进行另一种接入方式的检测；
根据主载波上的检测结果，在主载波上接入信道时，若从载波上的检测结果为闲，在主载波与从载波上接入信道，若从载波上的检测结果为忙，放弃在主载波与从载波上接入信道；
或，
在各载波集合中确定主载波集合与从载波集合；
在主载波集合上进行一种接入方式的检测，在从载波集合上进行另一种接入方式的检测；
根据主载波集合上的检测结果，在主载波集合上接入信道时，若从载波集合上的检测结果为闲，在主载波集合与从载波集合上接入信道，若从载波集合上的检测结果为忙，放弃在主载波集合与从载波集合上接入信道。
实施中，在主载波或主载波集合上进行的检测为扩展空闲信道评估ECCA；和/或，在从载波或从载波集合上进行的检测为初始空闲信道评估ICCA。
实施中，通过下述方式之一或者其组合确定主载波或主载波集合：
根据反馈信道忙/闲信息确定主载波或主载波集合、根据信道繁忙程度的统计信息确定主载波或主载波集合、根据信道实时检测信息确定主载波或主载波集合、随机选择主载波或主载波集合。
其中，在图6中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器600代表的一个或多个处理器和存储器620代表的存储器的各种电路链接在一起。总线架构还 可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机610可以是多个元件，即包括发送机和收发机，提供用于在传输介质上与各种其他装置通信的单元。处理器600负责管理总线架构和通常的处理，存储器620可以存储处理器600在执行操作时所使用的数据。
综上所述，在本发明实施例提供的技术方案中，对于LTE-U在非授权频段进行LBT时，由于存在RF泄露故对于相邻的载波需要进行同步LBT的情况，提出了一种多载波LBT的方案，对于同一个band内的相邻载波执行同步LBT，而对于频域距离远的如分别属于两个band的载波集合分别独立进行LBT。
随着移动数据业务量的不断增长，频谱资源越来越紧张，仅使用授权频谱资源进行网络部署和业务传输可能已经不能满足业务量需求，因此LTE系统可以考虑在非授权频谱资源上部署传输，以提高用户体验和扩展覆盖。但是目前LTE系统如何在非授权频谱资源上工作还没有明确的方法。而本发明实施例提供的技术方案正给出了一种LTE系统在非授权频谱上多个载波进行LBT的方案。本方案能有效保证多个载波用简单的方式即可实现聚合，使得不同band内的载波可以独立进行LBT，分别用于DL与UL传输。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他 可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (14)

  1. 一种先听后说LBT方法，其特征在于，包括：
    确定载波与载波之间，或载波集合与载波集合之间的频域距离；
    在频域距离大于预设值时，在载波或载波集合上分别进行LBT操作；
    在频域距离小于预设值时，在载波或载波集合上同步进行LBT操作。
  2. 如权利要求1所述的方法，其特征在于，在载波或载波集合上分别进行LBT操作，包括：在不同的载波或者载波集合上分别进行用于上行或下行传输的LBT操作。
  3. 如权利要求2所述的方法，其特征在于，
    在载波或者载波集合分别位于不同的频段时，所述在载波或载波集合上分别进行LBT操作，包括：在不同频段上的载波或者载波集合上分别进行用于上行或下行传输的LBT操作；
    在载波或者载波集合位于同一频段时，所述在载波或载波集合上分别进行LBT操作，包括：将载波间的距离大于预设值的载波或者载波集合分别进行用于上行或下行传输的LBT操作。
  4. 如权利要求3所述的方法，其特征在于，进一步包括：
    在载波集合分别位于不同的频段时，在不同频段上的载波集合上，同步分别进行用于上行或下行传输的LBT操作；
    在载波集合位于同一频段时，在载波集合上，同步分别进行用于上行或下行传输的LBT操作。
  5. 如权利要求1至4任一所述的方法，其特征在于，所述在载波或载波集合上同步进行LBT操作，包括：
    在各载波中确定主载波与从载波；
    在主载波上进行一种接入方式的检测，在从载波上进行另一种接入方式的检测；
    根据主载波上的检测结果，在主载波上接入信道时，若从载波上的检测结果为闲，在主载波与从载波上接入信道，若从载波上的检测结果为忙，放弃在主载波与从载波上接入信道；
    或，
    在各载波集合中确定主载波集合与从载波集合；
    在主载波集合上进行一种接入方式的检测，在从载波集合上进行另一种接入方式的检测；
    根据主载波集合上的检测结果，在主载波集合上接入信道时，若从载波集合上的检测结果为闲，在主载波集合与从载波集合上接入信道，若从载波集合上的检测结果为忙，放 弃在主载波集合与从载波集合上接入信道。
  6. 如权利要求5所述的方法，其特征在于，在主载波或主载波集合上进行的检测为扩展空闲信道评估ECCA；和/或，在从载波或从载波集合上进行的检测为初始空闲信道评估ICCA。
  7. 如权利要求5所述的方法，其特征在于，通过下述方式之一或者其组合确定主载波或主载波集合：
    根据反馈信道忙/闲信息确定主载波或主载波集合、根据信道繁忙程度的统计信息确定主载波或主载波集合、根据信道实时检测信息确定主载波或主载波集合、随机选择主载波或主载波集合。
  8. 一种先听后说LBT装置，其特征在于，包括：
    频域距离确定模块，用于确定载波与载波之间，或载波集合与载波集合之间的频域距离；
    LBT操作模块，用于在频域距离大于预设值时，在载波或载波集合上分别进行LBT操作；在频域距离小于预设值时，在载波或载波集合上同步进行LBT操作。
  9. 如权利要求8所述的装置，其特征在于，LBT操作模块进一步用于在载波或载波集合上分别进行LBT操作时，在不同的载波或者载波集合上分别进行用于上行或下行传输的LBT操作。
  10. 如权利要求9所述的装置，其特征在于，LBT操作模块进一步用于在载波或者载波集合分别位于不同的频段，在载波或载波集合上分别进行LBT操作时，在不同频段上的载波或者载波集合上分别进行用于上行或下行传输的LBT操作；在载波或者载波集合位于同一频段，在载波或载波集合上分别进行LBT操作时，将载波间的距离大于预设值的载波或者载波集合分别进行用于上行或下行传输的LBT操作。
  11. 如权利要求10所述的装置，其特征在于，LBT操作模块进一步用于在载波集合分别位于不同的频段时，在不同频段上的载波集合上，同步分别进行用于上行或下行传输的LBT操作；在载波集合位于同一频段时，在载波集合上，同步分别进行用于上行或下行传输的LBT操作。
  12. 如权利要求8至11任一所述的装置，其特征在于，LBT操作模块进一步用于在载波或载波集合上同步进行LBT操作时：
    在各载波中确定主载波与从载波；
    在主载波上进行一种接入方式的检测，在从载波上进行另一种接入方式的检测；
    根据主载波上的检测结果，在主载波上接入信道时，若从载波上的检测结果为闲，在主载波与从载波上接入信道，若从载波上的检测结果为忙，放弃在主载波与从载波上接入信道；
    或，
    在各载波集合中确定主载波集合与从载波集合；
    在主载波集合上进行一种接入方式的检测，在从载波集合上进行另一种接入方式的检测；
    根据主载波集合上的检测结果，在主载波集合上接入信道时，若从载波集合上的检测结果为闲，在主载波集合与从载波集合上接入信道，若从载波集合上的检测结果为忙，放弃在主载波集合与从载波集合上接入信道。
  13. 如权利要求12所述的装置，其特征在于，LBT操作模块进一步用于在主载波或主载波集合上进行ECCA；和/或，在从载波或从载波集合上进行ICCA。
  14. 如权利要求12所述的装置，其特征在于，LBT操作模块进一步用于通过下述方式之一或者其组合确定主载波或主载波集合：
    根据反馈信道忙/闲信息确定主载波或主载波集合、根据信道繁忙程度的统计信息确定主载波或主载波集合、根据信道实时检测信息确定主载波或主载波集合、随机选择主载波或主载波集合。
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