WO2020220561A1 - 一种下行信道指示方法及设备 - Google Patents

一种下行信道指示方法及设备 Download PDF

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Publication number
WO2020220561A1
WO2020220561A1 PCT/CN2019/105858 CN2019105858W WO2020220561A1 WO 2020220561 A1 WO2020220561 A1 WO 2020220561A1 CN 2019105858 W CN2019105858 W CN 2019105858W WO 2020220561 A1 WO2020220561 A1 WO 2020220561A1
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Prior art keywords
target
frequency band
indication information
network device
carrier
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PCT/CN2019/105858
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English (en)
French (fr)
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刘晓峰
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中国信息通信研究院
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Publication of WO2020220561A1 publication Critical patent/WO2020220561A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • This application relates to the field of mobile communication technologies, and in particular to a method and device for indicating downlink channels.
  • 5G has now become the latest generation of mobile communications technology, and various extended applications based on 5G will gradually flourish.
  • An important application of 5G is the use of unlicensed frequency bands. Compared with the licensed frequency band, the unlicensed frequency band needs to consider the coexistence of various wireless systems. Typical applications in unlicensed frequency bands are Wifi, LTE-based LAA technology, etc.
  • the unlicensed frequency band is used to use a mandatory listen-before-transmit technology (LBT), that is, data can be sent only when the current channel is not occupied.
  • LBT listen-before-transmit technology
  • This application proposes a downlink channel indication method and device to solve the problems of system resource waste and low work efficiency.
  • the embodiment of the present application proposes a downlink channel indication method for network equipment, including the following steps:
  • the target frequency band is one or more, and the minimum bandwidth is 20 MHz; the target carrier is one or more; each target carrier includes at least one target frequency band.
  • the length of the indication information is preset or configured by signaling.
  • the instruction information is sent in a public search space, or sent in a dedicated search space.
  • the indication information is carried by the PDCCH or by the demodulation reference signal.
  • the value of each bit in the indication information is used to indicate whether a frequency band is the target frequency band.
  • the number of bits in the indication information is less than the total number of frequency bands, or the number of bits in the indication information is equal to the total number of frequency bands.
  • the number of bits in the indication information is greater than the total number of frequency bands.
  • the valid period of the indication information is preset or configured by signaling. Further preferably, within the valid period, the network device updates the indication information.
  • the indication information includes C bits to indicate the number of target carriers, and D bits to indicate the number of target frequency bands on each target carrier.
  • the indication information indicates the target carrier or target frequency band in the following manner: only indicates the target frequency band, and the target carrier is the default; or, only indicates the target carrier, and the target frequency is the default.
  • At least one bit in the indication information is used to indicate multiple (for example, at least 2) target carriers and or multiple target frequency bands.
  • this application also proposes a network device used in the method described in any embodiment of this application; this application also proposes a terminal device used in the method described in any embodiment of this application.
  • the present invention provides a method and device for indicating occupied bandwidth by network equipment, which can realize the indication of the occupied bandwidth by the base station, thereby reducing invalid monitoring behavior of terminal equipment. It is beneficial to improve performance when the 5G new air interface design (NR) uses unlicensed frequency bands.
  • the network device configures the terminal according to the results of the bandwidth monitoring to enable data transmission. The terminal device does not need to spend monitoring resources on the relevant bandwidth to avoid waste.
  • Figure 1 is a schematic diagram of network equipment and terminal equipment
  • FIG. 2 is a flowchart of the method of the present invention
  • Figure 3 is a schematic diagram of a scenario where the indication information is the same as the number of frequency bands available for LBT;
  • Figure 4 is a schematic diagram of a scenario where the indication information is less than the number of frequency bands available for LBT;
  • Figure 5 is a schematic diagram of a scenario in which a subset of the available LBT frequency bands is selected
  • Fig. 6 is a schematic diagram of a scenario where the bits in the indication information are used to identify multiple bands or frequency bands.
  • BWP carrier aggregation and bandwidth part
  • One or more large bandwidths are divided into multiple carriers, and multiple BWPs can be configured in each carrier.
  • Each BWP is a continuous multiple PRB (Physical Resource Block), as defined in 38.211 for BWP.
  • the network equipment will configure the corresponding BWP on different carriers for the terminal equipment, and then configure the searching space of the downlink control channel (PDCCH) on the corresponding BWP.
  • the terminal equipment needs to perform periodic monitoring of the PDCCH on the configured search space.
  • the search space configuration process of PDCCH can be seen in 38.213.
  • the terminal device When multiple PDCCH search spaces are configured, the terminal device needs to periodically perform PDCCH monitoring in the search space according to a certain period.
  • the search space of the PDCCH is semi-statically configured according to the current standard, and cannot be adjusted quickly and dynamically.
  • the data transmission of the network equipment in the BWP configured with the PDCCH search space presents dynamic characteristics.
  • three BWPs are configured in one carrier, and network equipment monitors interference for each BWP.
  • the interference composition not only comes from terminal equipment but also other network equipment.
  • the terminal equipment needs to monitor the PDCCH in the BWP 1-3. If the network monitoring in BWP2 fails, the network device will not send data in BWP2.
  • the present invention provides a method and device for dynamically indicating the occupied bandwidth of a network device. Through the method and device, it is possible to realize the instruction of the network device to occupy the bandwidth, and the terminal device only monitors in the effective working frequency band indicated by the network device, thereby reducing the invalid monitoring behavior of the terminal device.
  • Figure 1 is a schematic diagram of network equipment and terminal equipment.
  • a network device can simultaneously send and receive data to multiple terminal devices.
  • the network equipment includes a network data unit and a network control unit.
  • the terminal equipment includes a terminal data unit and a terminal control unit.
  • the network data unit and the terminal data unit send data through the downlink data shared channel (PDSCH) and the uplink data shared channel (PUSCH).
  • the network control unit and the terminal control unit exchange control information through the downlink control channel (PDCCH) and the uplink control channel (PUCCH).
  • the PDCCH transmits downlink control information (DCI), and carries out specific transmission format related content of PDSCH, PUSCH and PUCCH.
  • DCI downlink control information
  • the terminal control unit feeds back to the network device whether the ACK/NACK information is correctly received or sends data from the terminal to the network according to the control information sent by the network control unit and the data reception status of the terminal data unit.
  • Specific ACK/NACK and other information are carried by PUCCH (uplink control channel).
  • PUCCH uplink control channel
  • Figure 2 is a flow chart of the method of the present invention.
  • the embodiment of the present application proposes a downlink channel indication method for network equipment, including the following steps:
  • Step 21 Monitor the frequency band on the carrier of the unlicensed frequency band.
  • Network equipment performs LBT on all carriers available for data transmission and bandwidth available for transmission on the carrier.
  • Network equipment interception generally takes 20MHz as the unit, that is, the minimum frequency band, and data can be sent only when the intercepted 20MHz bandwidth is free.
  • Network equipment monitors interference in each frequency band.
  • the interference composition not only comes from terminal equipment but also other network equipment. If the network monitoring fails in a frequency band, the network device will not send data in that frequency band.
  • Step 22 Select the target carrier and the target frequency band according to the monitoring result to send the PDCCH or PDSCH.
  • the target frequency band is one or more, and the minimum bandwidth is 20 MHz; the target carrier is one or more; each target carrier includes at least one target frequency band.
  • the network device prepares corresponding DCI indication information according to the LBT result and the configuration of the indication information by the higher layer.
  • Step 23 Send instruction information for identifying the target carrier and target frequency band.
  • the network device performs channel coding and modulation on the DCI information prepared in steps 21-22 to form a PDCCH (downlink physical control channel) containing downlink control information, and transmits it.
  • PDCCH downlink physical control channel
  • the length of the indication information is preset or configured by signaling.
  • the instruction information is sent in a public search space, or sent in a dedicated search space.
  • the indication information is carried by the PDCCH or by the demodulation reference signal.
  • the indication information includes C bits to indicate the number of target carriers, and D bits to indicate the number of target frequency bands on each target carrier.
  • the indication information indicates the target carrier or target frequency band in the following manner: only indicates the target frequency band, and the target carrier is the default; or, only indicates the target carrier, and the target frequency is the default.
  • Step 24 The valid period of the indication information is preset or configured by signaling. Further preferably, within the valid period, the network device re-executes steps 21 to 23 to update the instruction information.
  • the working process of the terminal device is:
  • Step 25 The terminal device receives the PDCCH containing the downlink control information sent by the network device, which contains the indication information.
  • Step 26 Perform corresponding PDCCH and PDSCH reception according to the instruction information sent by the network device.
  • the scheme of the present invention has an impact on the existing standard 38.212 and so on. If the indication information (including the identification of the LBT band) is added to the existing DCI format, the existing DCI0_0/0_1/1_0/1_1 in the standard 7.3.1 needs to add content similar to the following:
  • LBT band indicator A bits,according to LBT-Subband-indicator in Subclause xx of[9,TS38.331]
  • the LBT-Subband-indicator introduced in 38.212 needs to be further specified (corresponding to high-level configuration), such as:
  • LBTband-map-number SEQUENCE(SIZE(LBTbandmap1,LBTbandmap2...LBTbandmapnumber)
  • LBTbandmap SEQUENCE(SIZE(LBTbandmap1,LBTbandmap2...LBTbandmapnumber)
  • Figure 3 is a schematic diagram of a scenario where the indication information is the same as the number of bands available for LBT.
  • the value of each bit in the indication information is used to indicate whether a frequency band is the target frequency band. Further preferably, the number of bits in the indication information is equal to the total number of frequency bands.
  • the length of the indication information is equal to the number of frequency bands that the network device can listen before sending. Each bit represents a frequency band that can be heard first and then sent.
  • the network device can directly set the value of A bits, which represents whether the target frequency band performs PDCCH and PDSCH transmission. As shown in Figure 3, there are a total of two available carriers, and each carrier is configured with two bandwidths for listening.
  • the network side uses 4 bits to indicate 4 bandwidths.
  • the LBT band 1 ⁇ 3 ⁇ 4 monitors successfully, and the downlink data transmission is performed, but the LBT band 2 does not monitor successfully, and the network side decides not to perform data transmission within a certain period of time.
  • the indication for the 4 LBT frequency bands is 1011.
  • Figure 4 is a schematic diagram of a scenario where the indication information is less than the number of bands available for LBT.
  • the value of each bit in the indication information is used to indicate whether a frequency band is the target frequency band. Further preferably, the number of bits in the indication information is less than the total number of frequency bands.
  • the length of the indication information is less than the number of frequency bands that the network device can listen to before sending.
  • the value of A can represent a subset of all LBT frequency bands.
  • the representation of this subset can be a combination of carrier plus LBT frequency band, carrier alone, or LBT frequency band alone.
  • Figure 4 shows the situation where 4 bits represent the occupancy of 4 carriers and the LBT band is no longer indicated.
  • Figure 5 is a schematic diagram of a scenario where a subset of the available LBT frequency bands is selected.
  • the network device selects a subset of the multiple LBT frequency bands as an indication, and each bit represents 1 LBT frequency band.
  • the following figure selects LBT bands 1, 2, 4, and 6 as indicators. However, LBT frequency bands 3 and 5 are not indicated, and the terminal device that receives the indication may not monitor the LBT frequency bands that are out of the indication range and the LBT frequency bands that are instructed not to send.
  • Fig. 6 is a schematic diagram of a scenario where the bits in the indication information are used to identify multiple bands or frequency bands.
  • At least one bit in the indication information is used to indicate multiple (for example, at least 2) target carriers and or multiple target frequency bands.
  • the network device selects a subset of multiple LBT frequency bands as an indication, and each bit can represent one or more LBT frequency bands.
  • each bit can represent one or more LBT frequency bands.
  • multiple LBT frequency bands can be combined with or or operation.
  • the following figure shows LBT band 1 and LBT band 2 are indicated by 1 bit, and then the two bands do an OR operation. As long as there is one LBT band to send, it will indicate 1.
  • the terminal equipment will perform corresponding monitoring actions.
  • the number of bits in the indication information is greater than the total number of frequency bands.
  • the length of the indication information is greater than the number of frequency bands that the network device can listen to before sending. This situation corresponds to that the number of reserved bits for the bandwidth occupancy indication in the DCI is more than the number of available LBT frequency bands. At this time, the same number of bits as the LBT frequency band can be used for indication, and the remaining part is filled with all 0s or 1s.
  • the indication information may be carried by default on the transmission LBT frequency band with the smallest number indicated by the first signal, such as LBT frequency band 1 in the foregoing embodiment.
  • the effective time of the indication information may also be implicitly indicated by the second information sent at the same time when the indication information is sent.
  • the second information indicates the continuous transmission duration and or the uplink and downlink configuration adopted by the network device and the terminal device within a duration in the future, and the continuous transmission duration indicated by the second information may also be used as the duration of the indication information.
  • the embodiment of the application also proposes a network device.
  • the network device monitors the frequency band on the carrier of the unlicensed frequency band; selects the target carrier and the target frequency band according to the monitoring result, and To send PDCCH or PDSCH; send instruction information to identify the target carrier and target frequency band.
  • the embodiment of the application also proposes a terminal device.
  • the terminal device receives the instruction information sent by the network device, and performs detection according to the target carrier and target frequency band identified by the instruction information.
  • Listen (LBT) receive the corresponding PDCCH and PDSCH.
  • the present invention can be implemented by means of software plus the necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation. the way.
  • the technical solution of the present invention essentially or the part that contributes to the prior art can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium and includes several instructions to make a A terminal device (which may be a mobile phone, a personal computer, a server, or a network device, etc.) executes the method described in each embodiment of the present invention.

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Abstract

本申请公开了一种下行信道指示方法和设备，所述方法包括以下步骤：对非授权频段的载波上的频带进行监听；根据监听结果选择目标载波和目标频带，用于发送PDCCH或PDSCH；发出指示信息，用于标识所述目标载波和目标频带。本申请还包含应用所述方法的网络设备和系统。本申请的方案解决系统资源浪费和工作效率低的问题。

Description

一种下行信道指示方法及设备
本申请要求于2019年4月30日提交中国国家知识产权局、申请号为201910364600.9、发明名称为“一种下行信道指示方法及设备”的中国专利申请的优先权，该在先申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及移动通信技术领域，尤其涉及一种下行信道指示方法和设备。
背景技术
5G目前已经成为移动通信的最新一代技术，基于5G的各种扩展应用也将逐步蓬勃发展。5G一个重要应用就是在非授权频段的使用。非授权频段相对于授权频段，需要考虑各种无线系统的共存使用。典型的在非授权频段的应用如Wifi，基于LTE的LAA技术等。为了使多种技术可以和谐共存，对非授权频段使用采用强制的先听后发技术(LBT)，即只有当侦听到目前信道没有被占用时才能进行数据发送。
这种机制带来的问题是有些数据不能保证在确定的位置发送，尤其是基于5G NR的设计在非授权频段独立部署时，由于反馈信息不能保证在固定时间及时发送，在非授权频段业务比较繁忙的时候，基于NR的系统性能将大幅度下降。
根据5G NR在非授权频段的使用，其设计需要支持多种场景。当非授权频段的可使用带宽比较多，如超过100MHz时，为了使用这种超大的带宽，无论是网络侧设备还是终端侧设备，都需要进行侦听。
对于网络侧设备，当运行在多个侦听带宽上的时候，并不能预知数据发送时刻信道繁忙程度。对于终端设备，由于不确定网络设备将要使用的发送带宽，需要就全部可用带宽进行监测，造成工作负担，导致效率低下和资源浪费。
发明内容
本申请提出一种下行信道指示方法和设备，解决系统资源浪费和工作效率低的问题。
本申请实施例提出一种下行信道指示方法，用于网络设备，包括以下步骤：
对非授权频段的载波上的频带进行监听；
根据监听结果选择目标载波和目标频带，用于发送PDCCH或PDSCH；
发出指示信息，用于标识所述目标载波和目标频带。
优选地，所述目标频带为一个或多个，最小带宽为20MHz；所述目标载波为一个或多个；在每一个目标载波上包含至少一个目标频带。
优选地，所述指示信息的长度是预设的，或由信令配置的。
优选地，所述指示信息在公共搜索空间发送，或者，在专用搜索空间发送。
优选地，所述指示信息的至少一部分，由PDCCH承载，或者，由解调参考信号承载。
优选地，所述指示信息中每1个比特的值，用于表示1个频带是否为目标频带。进一步优选地，所述指示信息中的比特数，小于所述频带的总数，或者，所述指示信息中的比特数，等于所述频带的总数。
优选地，所述指示信息中的比特数，大于所述频带的总数。
优选地，所述指示信息的有效期间是预设的，或由信令配置的。进一步优选地，在有效期间内，网络设备更新所述指示信息。
优选地，所述指示信息包含C个比特指示目标载波数，包含D个比特用于指示每个目标载波上的目标频带数。
优选地，所述指示信息用以下方式表示所述目标载波或目标频带：仅表示目标频带，目标载波是默认的；或者，仅表示目标载波，目标频带是默认的。
优选地，所述指示信息中的至少1个比特，用于表示多个(例如，至少2个)目标载波和或多个目标频带。
此外，本申请还提出一种网络设备，用于本申请任意一项实施例所述方法； 本申请还提出一种终端设备，用于本申请任意一项实施例所述方法。
本申请实施例采用的上述至少一个技术方案能够达到以下有益效果：
为更合理的支持5G系统在非授权频谱的使用，本发明提供一种网络设备对占用带宽的指示方法和设备，可以实现基站对于占用带宽的指示，从而减少终端设备无效监测行为。有利于在5G新空口设计(NR)用到非授权频段时提高性能。当部分带宽资源未被网络设备使用时，网络设备根据该带宽上侦听的结果对终端进行配置，才能进行数据发送，终端设备不必在相关带宽花费监测资源，避免造成浪费。
附图说明
图1为网络设备和终端设备示意图；
图2为本发明方法的流程图；
图3为指示信息与可用于LBT的频带数量相同的情景示意图；
图4为指示信息小于可用于LBT的频带数量的情景示意图；
图5为在可用的LBT频带中选取一部分子集的情景示意图；
图6为指示信息中的比特用于标识多个波段或频带的情景示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合本申请具体实施例及相应的附图对本申请技术方案进行清楚、完整地描述。显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
根据目前NR的设计及协议规定，对大带宽的使用采用载波聚合和带宽配置(bandwidth part,BWP)技术。一个或多个大的带宽被分为多个载波，每个载波内可以配置多个BWP。每个BWP就是连续的多个PRB(物理资源块)，如38.211中对BWP定义。网络设备会为终端设备在不同的载波上配置相应的 BWP，然后在相应的BWP上配置下行控制信道(PDCCH)的搜索空间(searching space)。终端设备需要在配置的搜索空间上进行PDCCH的定期监测。PDCCH的搜索空间配置过程可见38.213。
当配置了多个PDCCH的搜索空间时，终端设备需要根据一定周期定期的在搜索空间内进行PDCCH监测。PDCCH的搜索空间根据目前标准是半静态配置，无法快速动态调整。对于非授权频段，由于LBT带来的不确定性，网络设备在配置了PDCCH搜索空间的BWP的数据发送呈现动态特性。例如，一个载波内配置了3个BWP，网络设备对每个BWP监听干扰。干扰组成不仅来源于终端设备还有其它网络设备等。终端设备需要在BWP 1～3进行PDCCH的监听。如果在BWP 2的网络监听失败，网络设备将不在BWP 2进行数据发送。
但是，根据现有技术标准，终端设备还会不断地在BWP 2进行PDCCH的监测。显然，此时在BWP2不断进行的监测会使UE白白浪费资源。为了减少UE无谓的监测行为，提升整个5G系统在非授权频段的效率，本发明给出一种网络设备对占用带宽的动态指示方法和设备。通过该方法和设备，可以实现网络设备对于占用带宽的指示，终端设备只在网络设备指示的有效工作频段进行监测，从而减少终端设备无效监测行为。
以下结合附图，详细说明本申请各实施例提供的技术方案。
图1为网络设备和终端设备示意图。
考虑一个由网络设备及终端设备组成的通信系统。一个网络设备可以同时给多个终端设备进行数据发送与接收。网络设备包括网络数据单元和网络控制单元。终端设备包括终端数据单元和终端控制单元。网络数据单元与终端数据单元通过下行数据共享信道(PDSCH)和上行数据共享信道(PUSCH)发送数据。而网络控制单元与终端控制单元通过下行控制信道(PDCCH)和上行控制信道(PUCCH)进行控制信息交换。其中PDCCH发送下行控制信息 (DCI)，进行PDSCH、PUSCH和PUCCH的具体发送格式相关内容。当终端数据单元数据接收完毕后，终端控制单元根据网络控制单元发送的控制信息和终端数据单元数据接收情况向网络设备反馈数据是否正确接收ACK/NACK信息或者进行终端向网络的数据发送。具体ACK/NACK等信息由PUCCH(上行控制信道)进行承载。本申请的网络设备，所述功能和方法由网络控制单元实现；本申请的终端设备，所述功能和方法由终端控制单元实现。
图2为本发明方法的流程图。
本申请实施例提出一种下行信道指示方法，用于网络设备，包括以下步骤：
步骤21、对非授权频段的载波上的频带进行监听。
网络设备对所有可用于数据发送的载波及载波上可用于发送的带宽进行LBT。
网络设备侦听一般以20MHz为单位，即最小频带，只有当侦听的20MHz带宽空闲时，才能进行数据的发送。
网络设备对每个频带监听干扰。干扰组成不仅来源于终端设备还有其它网络设备等。如果在一个频带的网络监听失败，网络设备将不在该频带发送数据。
步骤22、根据监听结果选择目标载波和目标频带，用于发送PDCCH或PDSCH。
优选地，所述目标频带为一个或多个，最小带宽为20MHz；所述目标载波为一个或多个；在每一个目标载波上包含至少一个目标频带。
网络设备根据LBT结果和高层对于所述指示信息的配置，进行相应的DCI指示信息准备。
步骤23、发出指示信息，用于标识所述目标载波和目标频带。
网络设备对步骤21～22中准备好的DCI信息进行信道编码、调制等操作，形成含有下行控制信息的PDCCH(下行物理控制信道)，并进行发送。
优选地，所述指示信息的长度是预设的，或由信令配置的。
优选地，所述指示信息在公共搜索空间发送，或者，在专用搜索空间发送。
优选地，所述指示信息的至少一部分，由PDCCH承载，或者，由解调参考信号承载。
优选地，所述指示信息包含C个比特指示目标载波数，包含D个比特用于指示每个目标载波上的目标频带数。
优选地，所述指示信息用以下方式表示所述目标载波或目标频带：仅表示目标频带，目标载波是默认的；或者，仅表示目标载波，目标频带是默认的。
步骤24、所述指示信息的有效期间是预设的，或由信令配置的。进一步优选地，在有效期间内，网络设备重新执行步骤21～23，更新所述指示信息。
与步骤21～23相对应地，终端设备的工作过程为：
步骤25、终端设备接收由网络设备发送的含有下行控制信息的PDCCH，其中包含所述指示信息。
步骤26、根据网络设备发送的指示信息，进行相应的PDCCH和PDSCH接收。
本发明的方案对现有标准38.212等产生影响。如果现有DCI的格式中加入所述指示信息(包含LBT频带的标识)，在该标准7.3.1中现有DCI0_0/0_1/1_0/1_1需要加入类似如下内容：
LBT band indicator:A bits,according to LBT-Subband-indicator in Subclause xx of[9,TS38.331]
如果引入新的DCI格式加入所述指示信息，也需要加入类似内容。
在38.311中需要对38.212中引入的LBT-Subband-indicator进行进一步规定(对应于高层配置)，如：
LBT-Subband-indicator::＝SEQUENCE{
Carrier-number SEQUENCE(SIZE(1..carrierNum)
LBTband-number SEQUENCE(SIZE(1..LBTbandNum)
}
或者
LBT-Subband-indicator::＝SEQUENCE{
Carrier-number SEQUENCE(SIZE(1..carrierNum)
LBTband-map-number SEQUENCE(SIZE(LBTbandmap1,LBTbandmap2…LBTbandmapnumber)
LBTbandmap SEQUENCE(SIZE(LBTbandmap1,LBTbandmap2…LBTbandmapnumber)
}
LBTbandmap::＝SEQUENCE{
LBTband SEQUENCE(1..LBTbandNumber)
}
图3为指示信息与可用于LBT的频带数量相同的情景示意图。
优选地，所述指示信息中每1个比特的值，用于表示1个频带是否为目标频带。进一步优选地，所述指示信息中的比特数等于所述频带的总数。
所述指示信息的长度等于网络设备所有可进行先听后发的频带个数。每个比特代表一个可进行先听后发的频带。网络设备可以直接设置A个比特数值，代表该目标频带是否进行PDCCH和PDSCH发送。如图3所示，一共两个可用载波，每个载波配置了2个进行侦听的带宽。网络侧采用4个比特对4个带宽进行指示。在第二时刻LBT频带1\3\4监听成功，进行下行数据发送，而LBT频带2没有监听成功，网络侧决定在一定时间内不再进行数据发送。相应的，对4个LBT频带的指示为1011。
图4为指示信息小于可用于LBT的频带数量的情景示意图。
优选地，所述指示信息中每1个比特的值，用于表示1个频带是否为目标频带。进一步优选地，所述指示信息中的比特数小于所述频带的总数。
所述指示信息的长度小于网络设备所有可进行先听后发的频带个数。A中值可以表示所有LBT频带的一个子集。该子集的表示方式可以载波加LBT频 带结合的方式，也可以单独以载波，或者单独以LBT频带方式进行。图4为4比特表示4个载波的占用情况，而LBT频带不再进行指示的情况。
图5为在可用的LBT频带中选取一部分子集的情景示意图。
网络设备选取多个LBT频带中选取一个子集作为指示，每个比特代表1个LBT频带。下图选取LBT频带1、2、4、6作为指示。而LBT频带3、5不进行指示，接收到指示的终端设备对不在指示范围的和指示为不发送的LBT频带均可以不作监测。
图6为指示信息中的比特用于标识多个波段或频带的情景示意图。
优选地，所述指示信息中的至少1个比特，用于表示多个(例如，至少2个)目标载波和或多个目标频带。
网络设备选取多个LBT频带中选取一个子集作为指示，每个比特可以代表1个或者多个LBT频带，代表多个LBT频带时，可以进行与或者或操作合并。下图为LBT频带1和LBT频带2用1个比特指示，然后两个band做一个或操作，只要有一个LBT频带发送，就指示1。终端设备就进行相应的监测行为。
需要说明的是，图3～6中，水平方向表示时隙(slot)单元分布，深色方块表示监听成功，用于发送信号；浅色方块则表示监听不成功，不能用于发送信号。
本申请的其他实施例，例如，所述指示信息中的比特数，大于所述频带的总数。所述指示信息的长度大于网络设备所有可进行先听后发的频带个数。此种情况对应于DCI中给带宽占用指示预留比特数多于可用的LBT频带数。此时可以采用和LBT频带数相同的比特进行指示，剩余部分用全0或1进行填充。
所述指示信息可以默认承载在第一信号指示的最小编号的发送LBT频带上，如上述实施例中的LBT频带1。所述指示信息的有效时间可以默认为若 干毫秒(ms)或者时隙(slot)，该值由系统直接配置或者直接进行约定(如10个slot，S+A-1＝10)。所述指示信息的有效时间也可以由发送所述指示信息同时发送的第二信息进行隐性指示。例如第二信息指示未来一段持续时间内的所述网络设备和所述终端设备采用的连续发送时长和或上下行配置，第二信息指示的连续发送时长也可作为所述指示信息的持续时间。
本申请实施例还提出一种网络设备，用本申请任意一项实施例所述方法，所述网络设备对非授权频段的载波上的频带进行监听；根据监听结果选择目标载波和目标频带，用于发送PDCCH或PDSCH；发出指示信息，用于标识所述目标载波和目标频带。
本申请实施例还提出一种终端设备，用本申请任意一项实施例所述方法，所述终端设备接收由所述网络设备发送的指示信息，按照指示信息标识的目标载波和目标频带进行侦听(LBT)、接收相应的PDCCH和PDSCH。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到本发明可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台终端设备(可以是手机，个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述的方法。
还需要说明的是，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、商品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、商品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、商品或者设备中还存在另外的相同要素。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视本发明的保护范围。

Claims (28)

  1. 一种下行信道指示方法，用于网络设备，其特征在于，包括以下步骤：
    对非授权频段的载波上的频带进行监听；
    根据监听结果选择目标载波和目标频带，用于发送PDCCH或PDSCH；
    发出指示信息，用于标识所述目标载波和目标频带。
  2. 如权利要求1所述方法，其特征在于，
    所述目标频带为一个或多个，最小带宽为20MHz；所述目标载波为一个或多个；在每一个目标载波上包含至少一个目标频带。
  3. 如权利要求1所述方法，其特征在于，所述指示信息的长度是预设的，或由信令配置的。
  4. 如权利要求1所述方法，其特征在于，所述指示信息在公共搜索空间发送，或者，在专用搜索空间发送。
  5. 如权利要求1所述方法，其特征在于，所述指示信息的至少一部分，由PDCCH承载，或者，由解调参考信号承载。
  6. 如权利要求1所述方法，其特征在于，所述指示信息中每1个比特的值，用于表示1个频带是否为目标频带。
  7. 如权利要求6所述方法，其特征在于，
    所述指示信息中的比特数，小于所述频带的总数，或者，
    所述指示信息中的比特数，等于所述频带的总数。
  8. 如权利要求1所述方法，其特征在于，所述指示信息的有效期间是预设的，或由信令配置的。
  9. 如权利要求1所述方法，其特征在于，所述指示信息中的比特数，大于所述频带的总数。
  10. 如权利要求8所述方法，其特征在于，包含以下步骤，在有效期间内，网络设备更新所述指示信息。
  11. 如权利要求1所述方法，其特征在于，所述指示信息包含C个比特指示目标载波数，包含D个比特用于指示每个目标载波上的目标频带数。
  12. 如权利要求1所述方法，其特征在于，所述指示信息用以下方式表示所述目标载波或目标频带：
    仅表示目标频带，目标载波是默认的；或者，
    仅表示目标载波，目标频带是默认的。
  13. 如权利要求1所述方法，其特征在于，所述指示信息中的至少1个比特，用于表示多个目标载波和或多个目标频带。
  14. 一种网络设备，其特征在于，所述网络设备对非授权频段的载波上的频带进行监听；根据监听结果选择目标载波和目标频带，用于发送PDCCH或PDSCH；发出指示信息，用于标识所述目标载波和目标频带。
  15. 如权利要求14所述网络设备，其特征在于，
    所述目标频带为一个或多个，最小带宽为20MHz；所述目标载波为一个或多个；在每一个目标载波上包含至少一个目标频带。
  16. 如权利要求14所述网络设备，其特征在于，所述指示信息的长度是预设的，或由信令配置的。
  17. 如权利要求14所述网络设备，其特征在于，所述指示信息在公共搜索空间发送，或者，在专用搜索空间发送。
  18. 如权利要求14所述网络设备，其特征在于，所述指示信息的至少一部分，由PDCCH承载，或者，由解调参考信号承载。
  19. 如权利要求14所述网络设备，其特征在于，所述指示信息中每1个比特的值，用于表示1个频带是否为目标频带。
  20. 如权利要求19所述网络设备，其特征在于，
    所述指示信息中的比特数，小于所述频带的总数，或者，
    所述指示信息中的比特数，等于所述频带的总数。
  21. 如权利要求14所述网络设备，其特征在于，所述指示信息的有效期间是预设的，或由信令配置的。
  22. 如权利要求14所述网络设备，其特征在于，所述指示信息中的比特数，大于所述频带的总数。
  23. 如权利要求21所述网络设备，其特征在于，包含以下步骤，在有效期间内，网络设备更新所述指示信息。
  24. 如权利要求14所述网络设备，其特征在于，所述指示信息包含C个比特指示目标载波数，包含D个比特用于指示每个目标载波上的目标频带数。
  25. 如权利要求14所述网络设备，其特征在于，所述指示信息用以下方式表示所述目标载波或目标频带：
    仅表示目标频带，目标载波是默认的；或者，
    仅表示目标载波，目标频带是默认的。
  26. 如权利要求14所述网络设备，其特征在于，所述指示信息中的至少1个比特，用于表示多个目标载波和或多个目标频带。
  27. 一种终端设备，用权利要求1～13任意一项所述方法，其特征在于，所述终端设备接收由所述网络设备发送的指示信息，按照指示信息标识的目标载波和目标频带进行侦听、接收相应的PDCCH和PDSCH。
  28. 一种终端设备，其特征在于，所述终端设备接收由权利要求14～26任意一项所述网络设备发送的指示信息，按照指示信息标识的目标载波和目标频带进行侦听、接收相应的PDCCH和PDSCH。
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