WO2018176479A1 - 一种上行同步方法及装置 - Google Patents

一种上行同步方法及装置 Download PDF

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Publication number
WO2018176479A1
WO2018176479A1 PCT/CN2017/079326 CN2017079326W WO2018176479A1 WO 2018176479 A1 WO2018176479 A1 WO 2018176479A1 CN 2017079326 W CN2017079326 W CN 2017079326W WO 2018176479 A1 WO2018176479 A1 WO 2018176479A1
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Prior art keywords
network device
time
uplink subframe
adjustment amount
time adjustment
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PCT/CN2017/079326
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English (en)
French (fr)
Inventor
李振宇
胡磊
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201780089199.1A priority Critical patent/CN110476464B/zh
Priority to PCT/CN2017/079326 priority patent/WO2018176479A1/zh
Publication of WO2018176479A1 publication Critical patent/WO2018176479A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present application relates to the field of wireless communications, and in particular, to an uplink synchronization method and apparatus.
  • LTE Long Term Evolution
  • LAA-LTE Licensed-Assisted Access Using Long Term Evolution
  • Listening to Talk is a coexistence strategy between systems.
  • the characteristics of the LBT are: before each terminal device sends a signal on a certain channel, it needs to go through the Clear Channel Assessment (CCA) process to detect whether the current channel is idle. If so, the terminal device can send a signal. If not, The terminal device is currently unable to transmit signals, so based on the LBT rule, the data transmission of the terminal device in the unlicensed band is opportunistic.
  • CCA Clear Channel Assessment
  • the terminal device that is different from the network device has a transmission delay in communication with the network device, and the LTE system satisfies the Timing Advance (TA) adjustment for the terminal device.
  • the uplink data transmission of the terminal devices at different distances can be aligned on the network device side, that is, the network device controls the time of the uplink data of the terminal devices different from the network device to reach the network device by controlling the TA of each terminal device, thereby The network device side alignment receives the uplink subframe timing, as shown in FIG. 1.
  • the uplink transmission requires the terminal device to perform uplink LBT first, which satisfies the channel occupancy condition, and the terminal device is allowed to perform uplink data transmission.
  • the remote terminal device Based on the current TA mode, if different terminal devices want to transmit in the same uplink subframe, the remote terminal device will start the CCA first, and then start transmitting.
  • the near-end terminal device starts the uplink CCA detection, The use of the channel by the remote terminal device causes the near-end terminal device to consider that the channel is not idle and cannot perform uplink transmission, as shown in FIG. 2 .
  • the terminal devices and the network devices have different distances, the terminal devices that need to transmit data in the same uplink subframe need to perform CCA detection. The problem that some terminal devices are not available for uplink.
  • the present application describes an uplink synchronization method and apparatus, which can avoid interference of uplink transmissions of terminal devices operating under the LBT mechanism on the unlicensed frequency band.
  • an embodiment of the present application provides an uplink synchronization method, where the method is applied to a communication system under an LBT mechanism operating on an unlicensed frequency band, including: determining, by the network device, a time adjustment amount, the time adjustment The quantity indicates an adjustment value of a start time of an uplink subframe occupied by one or more terminal devices in the cell corresponding to the network device to transmit data to the network device; the network device adjusts the time adjustment amount Sent to the one or more Multiple terminal devices.
  • the network device determines a time adjustment amount, where the network device determines the time adjustment amount such that a start time of the uplink subframe is started by the network device. The moment of regular reception of the uplink subframe.
  • the network device determines a time adjustment amount, where the network device determines the time adjustment amount such that a start time of the uplink subframe is started than the network device
  • the time of the conventional reception of the uplink subframe is advanced by a first time, and the first time is determined according to a distance between a farthest coverage point of the cell corresponding to the network device and a network device.
  • the network device determines a time adjustment amount, where the network device determines the time adjustment amount such that a start time of the uplink subframe is a first time,
  • the first time is a time between the second time and a time when the network device starts the normal reception of the uplink subframe, where the second time is higher than a time when the network device starts the normal reception of the uplink subframe
  • the first time is determined according to the distance between the farthest coverage point of the cell corresponding to the network device and the network device.
  • the embodiment of the present application provides a network device, where the method in any one of the possible implementation manners of the first aspect or the first aspect is performed.
  • the network device comprises means for performing the method of the first aspect or any one of the possible implementations of the first aspect.
  • an embodiment of the present application provides a network device, where the network device includes: a receiver, a transmitter, a processor, and a memory.
  • the receiver, the transmitter, the processor and the memory can be connected by a bus system.
  • the memory is for storing a program, an instruction or a code
  • the processor is for executing a program, an instruction or a code in the memory, and completing the method of the first aspect, any possible implementation of the first aspect.
  • the embodiment of the present application provides a communication system, where the communication system includes a terminal device and the network device in the second aspect or the third aspect.
  • the embodiment of the present application provides a computer readable storage medium for storing a computer program, where the computer program is used to execute the instructions of the method in the first aspect, any possible implementation manner of the first aspect.
  • FIG. 1 is a schematic diagram of uplink transmission of a terminal device in the prior art
  • FIG. 2 is a schematic diagram of uplink transmission of a terminal device operating under an LBT mechanism in an unlicensed frequency band in the prior art
  • FIG. 3 is a schematic diagram of a network architecture applied in an embodiment of the present application.
  • FIG. 4 is a flow chart of an embodiment of an uplink synchronization method provided by the present application.
  • FIG. 5 is a schematic diagram of uplink transmission of a terminal device operating under an LBT mechanism on an unlicensed band in the embodiment of the present application;
  • FIG. 6 is another schematic diagram of uplink transmission of a terminal device operating under an LBT mechanism on an unlicensed band in the embodiment of the present application;
  • FIG. 7 is another schematic diagram of uplink transmission of a terminal device operating under an LBT mechanism in an unlicensed frequency band in the embodiment of the present application;
  • FIG. 8 is a structural diagram of an embodiment of a network device provided by the present application.
  • FIG. 9 is a structural diagram of another embodiment of a network device provided by the present application.
  • FIG. 1 shows a communication system 100 to which an embodiment of the present application is applied.
  • Communication system 100 can include at least one network device 110 and a plurality of terminal devices 120 located within the coverage of network device 110.
  • FIG. 1 exemplarily shows one network device and two terminal devices.
  • the communication system 100 may include multiple network devices and may include other numbers of terminal devices within the coverage of each network device. This example does not limit this.
  • the wireless communication system 100 may further include other network entities, such as a network controller, a mobility management entity, and the like.
  • network entities such as a network controller, a mobility management entity, and the like.
  • the embodiment of the present application is not limited thereto.
  • the communication system used in the embodiments of the present application may be a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, or a Wideband Code Division Multiple Access (Wideband Code Division Multiple Access).
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • Wideband Code Division Multiple Access Wideband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division duplex
  • UMTS Universal Mobile Telecommunication System
  • NR 5G New Radio
  • OFDM Orthogonal Frequency-Division Multiplexing
  • the network device involved in the embodiment of the present application may be used to provide a wireless communication function for the terminal device.
  • the network device may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like.
  • the network device may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB, NB) in WCDMA, or may be an evolved Node B (eNB) in LTE. Or e-NodeB), and may be the corresponding device gNB in the 5G network.
  • BTS Base Transceiver Station
  • NodeB NodeB
  • eNB evolved Node B
  • e-NodeB evolved Node B
  • the foregoing apparatus for providing a wireless communication function for a terminal device is collectively referred to as a network device.
  • the terminal device involved in the embodiment of the present application may also be referred to as a user equipment (User Equipment, UE), a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), etc., and the terminal device may be wirelessly accessed.
  • the Radio Access Network (RAN) communicates with one or more core networks.
  • the terminal device may be a mobile phone (or “cellular” phone), a computer with a mobile terminal, etc., for example, the terminal device may also be Portable, pocket, handheld, computer built-in or in-vehicle mobile devices that exchange language and/or data with a wireless access network.
  • the embodiment of the present application does not specifically limit it.
  • the network architecture and the service scenario described in the embodiments of the present application are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation of the technical solutions provided by the embodiments of the present application.
  • the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.
  • FIG. 4 is a schematic flowchart diagram of an uplink synchronization method according to an embodiment of the present invention.
  • the network device determines a time adjustment amount, where the time adjustment amount indicates a start time of an uplink subframe occupied by one or more terminal devices in the cell corresponding to the network device to send data to the network device Adjustment value.
  • the time adjustment amount may be a time value, that is, the time adjustment amount may be an adjustment value itself of a start time of the uplink subframe.
  • the time adjustment value may be an index number, in this In the case where the network device and the one or more terminal devices store the same time adjustment amount index table, in the time adjustment amount index table, the adjustment value of the start time of the uplink subframe One-to-one correspondence with the index number.
  • the adjustment value of the start time of the uplink subframe refers to a difference between the adjusted start time of the uplink subframe and the original start time of the uplink subframe.
  • the one or more terminal devices may be all the terminal devices in the cell corresponding to the network device, or may be part of the terminal devices, which is not limited in this application.
  • the one or more terminal devices may be terminal devices operating under an LBT mechanism operating in an unlicensed band within a cell corresponding to the network device.
  • the one or more terminal devices may be terminal devices operating under the LBT mechanism operating on the same unlicensed frequency band within a cell corresponding to the network device.
  • S220 The network device sends the time adjustment amount to the one or more terminal devices.
  • the network device may send the time adjustment amount to the one or more terminal devices in a manner of transmitting a TA in the prior art, and may also adopt other manners, which is not limited in this application.
  • S230 The one or more terminal devices determine a starting moment of the uplink subframe according to the time adjustment amount.
  • the one or more terminal devices may perform a lookup in the time adjustment index table stored therein according to the index number to determine the The adjustment value of the start time of the uplink subframe.
  • the original starting moments of the n uplink subframes occupied by the terminal device 1 to transmit data to the network device are t 1 , t 2 , t 3 , ..., t n , respectively, of the uplink subframe.
  • the adjusted starting value is ⁇ t
  • the adjusted starting moments of the n uplink subframes are (t 1 + ⁇ t), (t 2 + ⁇ t), (t 3 + ⁇ t), ..., respectively. (t n + ⁇ t).
  • S240 The one or more terminal devices send data to the network device according to a start time of the uplink subframe after the CCA succeeds.
  • the terminal devices adjust the amount to the The start time of the uplink subframe occupied by the network device, wherein the start times of the uplink subframes are the same as each other, and since the CCA detection is completed before the data is sent, the terminal devices are guaranteed to send to the network device.
  • the start times of the uplink subframes occupied by the data are the same as each other, so that each terminal device in the terminal device does not initiate transmission by the terminal device that needs to transmit data on the same uplink subframe when performing CCA detection. It is misunderstood that the channel is not idle, which effectively improves the probability of uplink CCA success of the terminal device and increases the uplink multi-user capacity.
  • the network device determines the time adjustment amount such that a start time of the uplink subframe is a time when the network device starts normal reception of the uplink subframe.
  • the network device determines the time adjustment amount such that the start time of the uplink subframe is aligned with the time when the network device starts the normal reception of the uplink subframe, as shown in FIG.
  • the distances between the near-end terminal device 1 and the remote terminal device 2 and the network device are different from each other, the starting times of the uplink subframes occupied by the data transmission to the network device are the same as each other.
  • the uplink subframe occupied by the data transmitted to the network device actually arrives.
  • Network device The time is later than the time when the network device starts the normal reception of the uplink subframe. Therefore, to ensure the integrity of the data reception, the terminal device leaves the tail part symbol of the uplink subframe as blank as an example. The data is not carried. For example, the terminal device may leave the last symbol of the uplink subframe as blank.
  • the network device determines the time adjustment amount such that a start time of the uplink subframe is earlier than a time when the network device starts a normal reception of the uplink subframe,
  • the first time is determined according to a distance between a farthest coverage point of the cell corresponding to the network device and the network device.
  • the first time is a transmission delay between a terminal device located at a farthest coverage point of a cell corresponding to the network device and the network device.
  • the remote terminal device 2 is located at the farthest coverage point of the cell corresponding to the network device, the uplink subframe occupied by the data transmission to the network device arrives.
  • the moment of the network device is aligned with a time at which the network device initiates regular reception of the uplink subframe, and for a terminal device that is not located at a farthest coverage point of a cell corresponding to the network device (eg, near The end terminal device 1), the time when the uplink subframe occupied by the network device to the data device arrives at the network device is earlier than the time when the network device starts the normal reception of the uplink subframe, therefore, As an example, the terminal device does not need to leave the tail part symbol of the uplink subframe as blank.
  • the network device determines the time adjustment amount such that a start time of the uplink subframe is a first time, and the first time is a second time and the network device startup Determining a time between the times of conventional reception of the uplink subframe, the second time being earlier than a time when the network device starts the normal reception of the uplink subframe, the first time is according to the network The distance between the farthest coverage point of the cell corresponding to the device and the network device is determined.
  • the first time is a transmission delay between a terminal device located at a farthest coverage point of a cell corresponding to the network device and the network device.
  • the transmission delay between the near-end terminal device 1 and the network device is less than the first time, and the transmission between the remote terminal device 2 and the network device If the time delay is greater than the first time, the time that the uplink subframe occupied by the near-end terminal device 1 to transmit data to the network device arrives at the network device is earlier than the network device starts the uplink subframe.
  • the time of the conventional reception, and the time when the uplink subframe occupied by the remote terminal device 2 to transmit data to the network device arrives at the network device is later than the time when the network device starts the normal reception of the uplink subframe. That is, in the one or more terminal devices, there may be an uplink subframe in which the uplink subframe occupied by transmitting data to the network device arrives at the network device is later than an air interface uplink subframe of the network device. Terminal device (once the transmission delay between the terminal device and the network device is greater than the first time), therefore, to ensure the integrity of data reception, as an example, the terminal device The trailing part of the uplink subframe is left blank and does not carry data. For example, the terminal device may leave the last symbol of the uplink subframe as blank.
  • the network device may determine the first time according to a distance distribution of the one or more terminal devices. For example, in a case where a majority of the one or more terminal devices are closer to the network device, the network device may determine a smaller first time; at the one or more terminals In a case where a majority of terminals in the device are far away from the network device, the network device can determine a larger first time.
  • an embodiment of a network device includes a sending unit 310 and a processing unit 320.
  • the processing unit 320 is configured to: determine a time adjustment amount, where the time adjustment amount indicates an uplink subframe occupied by one or more terminal devices in the cell corresponding to the network device to send data to the network device The adjustment value of the starting moment.
  • the sending unit 310 is configured to: send the time adjustment amount to the one or more terminal devices.
  • the processing unit 320 is further configured to: determine the time adjustment amount such that a start time of the uplink subframe is a time when the network device starts normal reception of the uplink subframe.
  • the processing unit 320 is further configured to: determine the time adjustment amount such that a start time of the uplink subframe is earlier than a time when the network device starts normal reception of the uplink subframe.
  • the first time is determined according to a distance between a farthest coverage point of the cell corresponding to the network device and the network device.
  • the processing unit 320 is further configured to: determine the time adjustment amount such that a start time of the uplink subframe is a first time, and the first time is a second time and the network device And a time between a time of the conventional reception of the uplink subframe, where the second time is earlier than a time when the network device starts the normal reception of the uplink subframe, where the first time is Determining the distance between the farthest coverage point of the cell corresponding to the network device and the network device.
  • another embodiment of a network device provided by the present application includes a transmitter 410 and a processor 420.
  • the processor 420 is configured to: determine a time adjustment amount, where the time adjustment quantity indicates an uplink subframe occupied by one or more terminal devices in a cell corresponding to the network device to send data to the network device The adjustment value of the starting moment.
  • the transmitter 410 is configured to: send the time adjustment amount to the one or more terminal devices.
  • the processor 420 is further configured to: determine the time adjustment amount such that a start time of the uplink subframe is a time when the network device starts normal reception of the uplink subframe.
  • the processor 420 is further configured to: determine the time adjustment amount such that a start time of the uplink subframe is earlier than a time when the network device starts normal reception of the uplink subframe.
  • the first time is determined according to a distance between a farthest coverage point of the cell corresponding to the network device and the network device.
  • the processor 420 is further configured to: determine the time adjustment amount such that a start time of the uplink subframe is a first time, and the first time is a second time and the network device And a time between a time of the conventional reception of the uplink subframe, where the second time is earlier than a time when the network device starts the normal reception of the uplink subframe, where the first time is Determining the distance between the farthest coverage point of the cell corresponding to the network device and the network device.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

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Abstract

本申请提供了一种上行同步方法及装置。所述方法应用于免许可频段上的LBT机制下的通信系统中，所述方法包括：网络设备确定一个时间调整量，所述时间调整量指示与所述网络设备对应的小区内的一个或更多个终端设备向所述网络设备发送数据所占用的上行子帧的起始时刻的调整值；所述网络设备将所述时间调整量发送给所述一个或更多个终端设备。通过本发明提供的方案，可以避免工作在免许可频段上LBT机制下的终端设备的上行传输相互干扰。

Description

一种上行同步方法及装置 技术领域
本申请涉及无线通信领域，尤其涉及一种上行同步方法及装置。
背景技术
频谱是无线通信的基础，根据最新发布的美国联邦通信委员会(Federal Communications Commission，FCC)国际频谱白皮书，免许可频段(也称为未授权(unlicensed)频谱)资源要大于许可频段(也称为授权(licensed)频谱)资源，因此，将长期演进(Long Term Evolution，LTE)终端设备应用在免许可频段，例如，许可辅助接入长期演进(Licensed-Assisted Access Using Long Term Evolution，LAA-LTE)系统，不仅可以有效利用免许可频段，还可以提供更为有效的无线接入，以满足日益增长的移动宽带服务需求。
先听后说(Listen Before Talk，LBT)是系统间的共存策略。LBT的特点为：每个终端设备在某个信道上发送信号之前，需要先经过空闲信道评估(Clear Channel Assessment，CCA)过程，检测当前信道是否空闲，若是，终端设备可发送信号，若否，终端设备当前无法发送信号，因此，基于LBT规则，终端设备在免许可频段的数据传输是机会性的。
网络设备所配置的小区的覆盖范围内，距离网络设备不同远近的终端设备，其与网络设备间通信存在着传输时延，LTE系统通过针对终端设备的时间提前(Timing Advance，TA)调整来满足不同距离的终端设备的上行数据传输到达网络设备侧能对齐，即，网络设备通过控制每个终端设备的TA，来控制距离网络设备不同远近的终端设备的上行数据到达网络设备的时间，从而在网络设备侧对齐接收到上行子帧时序，如图1所示。
但是在LBT机制下，上行传输需要终端设备先进行上行LBT，满足信道占用条件，终端设备才被容许进行上行数据传输。基于现行TA方式，如果不同远近的终端设备都想在同一上行子帧进行传输，那么，远端的终端设备会先行启动CCA，之后开始传输，待近端的终端设备启动上行CCA检测时，由于远端的终端设备对信道的使用，导致近端的终端设备认为信道不空闲而不能进行上行传输，如图2所示。
因此，需要重点研究在免许可频段载波上，由于终端设备和网络设备距离不同，引入的需要在同一个上行子帧上传输数据的不同远近的终端设备进行CCA检测时，终端设备之间相互干扰导致部分终端设备上行不可用的问题。
发明内容
本申请描述了一种上行同步方法及装置，能够避免工作在免许可频段上LBT机制下的终端设备的上行传输相互干扰。
第一方面，本申请实施例提供了一种上行同步方法，所述方法应用于工作在免许可频段上的LBT机制下的通信系统中，包括：网络设备确定一个时间调整量，所述时间调整量指示与所述网络设备对应的小区内的一个或更多个终端设备向所述网络设备发送数据所占用的上行子帧的起始时刻的调整值；所述网络设备将所述时间调整量发送给所述一个或更 多个终端设备。
在第一方面的一个可能的实现方式中，网络设备确定一个时间调整量，包括：所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻为所述网络设备启动所述上行子帧的常规接收的时刻。
在第一方面的一个可能的实现方式中，网络设备确定一个时间调整量，包括：所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与网络设备之间的距离而确定的。
在第一方面的一个可能的实现方式中，网络设备确定一个时间调整量，包括：所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻为第一时刻，所述第一时刻为第二时刻与所述网络设备启动所述上行子帧的常规接收的时刻之间的时刻，所述第二时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与网络设备之间的距离而确定的。
第二方面，本申请实施例提供了一种网络设备，执行第一方面或第一方面的任意一种可能的实现方式中的方法。具体地，所述网络设备包括用于执行第一方面或第一方面的任意一种可能的实现方式中的方法的单元。
第三方面，本申请实施例提供了一种网络设备，所述网络设备包括：接收器、发送器、处理器和存储器。所述接收器、所述发送器、所述处理器和所述存储器之间可以通过总线系统相连。所述存储器用于存储程序、指令或代码，所述处理器用于执行所述存储器中的程序、指令或代码，完成第一方面、第一方面的任意可能的实现方式中的方法。
第四方面，本申请实施例提供了一种通信系统，所述通信系统包括终端设备和第二方面或第三方面中的网络设备。
第五方面，本申请实施例提供了一种计算机可读存储介质，用于存储计算机程序，所述计算机程序用于执行第一方面、第一方面任意可能的实现方式中的方法的指令。
附图说明
图1是现有技术中终端设备的上行传输的示意图；
图2是现有技术中工作在免许可频段上LBT机制下的终端设备的上行传输的示意图；
图3是本申请实施例应用的一种网络架构的示意图；
图4是本申请提供的上行同步方法的一个实施例的流程图；
图5是本申请实施例中工作在免许可频段上LBT机制下的终端设备的上行传输的示意图；
图6是本申请实施例中工作在免许可频段上LBT机制下的终端设备的上行传输的另一示意图；
图7是本申请实施例中工作在免许可频段上LBT机制下的终端设备的上行传输的又一示意图；
图8是本申请提供的网络设备的一个实施例的结构图；
图9是本申请提供的网络设备的另一个实施例的结构图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
图1示出了本申请实施例应用的通信系统100。通信系统100可以包括至少一个网络设备110和位于网络设备110覆盖范围内的多个终端设备120。图1示例性地示出了一个网络设备和两个终端设备，可选地，通信系统100可以包括多个网络设备并且每个网络设备的覆盖范围内可以包括其它数量的终端设备，本申请实施例对此不做限定。
可选地，无线通信系统100还可以包括网络控制器、移动管理实体等其他网络实体，本申请实施例不限于此。
本申请实施例所应用的通信系统可以为全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、5G New Radio(NR)系统及其他应用正交频分复用(Orthogonal Frequency-Division Multiplexing，OFDM)技术的无线通信系统等。
本申请实施例中所涉及的网络设备可用于为终端设备提供无线通信功能。所述网络设备可以包括各种形式的宏基站，微基站(也称为小站)，中继站，接入点等。所述网络设备可以是GSM或CDMA中的基站收发台(Base Transceiver Station，BTS)，也可以是WCDMA中的基站(NodeB，NB)，还可以是LTE中的演进型基站(Evolutional Node B，eNB或e-NodeB)，以及可以是5G网络中对应的设备gNB。为方便描述，本申请所有实施例中，上述为终端设备提供无线通信功能的装置统称为网络设备。
本申请实施例中所涉及的终端设备也可称之为用户设备(User Equipment，UE)、移动台(Mobile Station，MS)、移动终端(Mobile Terminal)等，所述终端设备可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，例如，终端设备可以是移动电话(或称为“蜂窝”电话)、具有移动终端的计算机等，例如，终端设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。本申请实施例中不做具体限定。
本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
下面将基于上面所述的本发明涉及的共性方面，对本发明实施例进一步详细说明。
图4为本发明实施例所提供的一种上行同步方法的流程示意图。
S210：网络设备确定一个时间调整量，所述时间调整量指示与所述网络设备对应的小区内的一个或更多个终端设备向所述网络设备发送数据所占用的上行子帧的起始时刻的调整值。
作为示例，所述时间调整量可以是时间值，也就是说，所述时间调整量可以是所述上行子帧的起始时刻的调整值本身。作为另一示例，所述时间调整值可以是索引号，在这种 情况下，所述网络设备和所述一个或更多个终端设备中存储有相同的时间调整量索引表，在所述时间调整量索引表中，所述上行子帧的起始时刻的调整值与所述索引号一一对应。
这里，所述上行子帧的起始时刻的调整值是指所述上行子帧的调整后的起始时刻与所述上行子帧的原始的起始时刻之间的差值。
这里，所述一个或更多个终端设备可以是与所述网络设备对应的小区内的全部终端设备，也可以是其中的部分终端设备，本申请对此不做限定。作为示例，所述一个或更多个终端设备可以是与所述网络设备对应的小区内工作在免许可频段上的LBT机制下的终端设备。作为另一示例，所述一个或更多个终端设备可以是与所述网络设备对应的小区内工作在同一免许可频段上的LBT机制下的终端设备。
S220：所述网络设备将所述时间调整量发送给所述一个或更多个终端设备。
这里，所述网络设备可以按照现有技术中发送TA的方式将所述时间调整量发送给所述一个或更多个终端设备，也可以采用其他方式，本申请对此不做限定。
S230：所述一个或更多个终端设备根据所述时间调整量来确定所述上行子帧的起始时刻。
作为示例，在所述时间调整值是索引号的情况下，所述一个或更多个终端设备可以根据所述索引号在其存储的所述时间调整量索引表中进行查找，以确定所述上行子帧的起始时刻的调整值。
例如，假设终端设备1向所述网络设备发送数据所占用的n个上行子帧的原始的起始时刻分别为t1、t2、t3、……、tn，所述上行子帧的起始时刻的调整值为Δt，则所述n个上行子帧的调整后的起始时刻分别为(t1+Δt)、(t2+Δt)、(t3+Δt)、……、(tn+Δt)。
S240：所述一个或更多个终端设备在CCA成功后，根据所述上行子帧的起始时刻向所述网络设备发送数据。
这里，CCA过程与上行数据发送过程之间可以具有间隔，也可以不具有间隔，本申请对此不做限定。
在本实施例中，由于所述网络设备确定一个时间调整量并将所述时间调整量发送给所述一个或更多个终端设备，因此这些终端设备根据同一时间调整量来调整其向所述网络设备发送数据所占用的上行子帧的起始时刻，这使得所述上行子帧的起始时刻彼此相同，而由于在发送数据之前完成CCA检测，因此保证这些终端设备向所述网络设备发送数据所占用的上行子帧的起始时刻彼此相同，就使得这些终端设备中的每一个终端设备在进行CCA检测时不会由于其他需要在同一上行子帧上发送数据的终端设备先行启动发送而误以为信道不空闲，有效提升了所述终端设备的上行CCA成功几率，增加上行多用户容量。
可选地，在S210，所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻为所述网络设备启动所述上行子帧的常规接收的时刻。
也就是说，所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻与所述网络设备启动所述上行子帧的常规接收的时刻对齐，如图5所示，近端终端设备1和远端终端设备2与所述网络设备之间的距离虽然彼此不同，但其向所述网络设备发送数据所占用的上行子帧的起始时刻彼此相同。
在这种情况下，由于传输时延，如图5所示，无论对于近端终端设备1还是对于远端终端设备2而言，其向所述网络设备发送数据所占用的上行子帧实际到达所述网络设备的 时刻均晚于所述网络设备启动所述上行子帧的常规接收的时刻，因此，为保证数据接收的完整性，作为示例，所述终端设备将所述上行子帧的尾部部分符号留作空白，不承载数据，例如，所述终端设备可以将所述上行子帧的最后一个符号留作空白。
可选地，在S210，所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与所述网络设备之间的距离而确定的。
作为示例，所述第一时间是位于与所述网络设备对应的小区的最远覆盖点处的终端设备与所述网络设备之间的传输时延。在这种情况下，如图6所示，假设远端终端设备2位于与所述网络设备对应的小区的最远覆盖点处，则其向所述网络设备发送数据所占用的上行子帧到达所述网络设备的时刻与所述网络设备启动所述上行子帧的常规接收的时刻对齐，而对于并未位于与所述网络设备对应的小区的最远覆盖点处的终端设备(例如，近端终端设备1)而言，其向所述网络设备发送数据所占用的上行子帧到达所述网络设备的时刻均早于所述网络设备启动所述上行子帧的常规接收的时刻，因此，作为示例，所述终端设备无需将所述上行子帧的尾部部分符号留作空白。
可选地，在S210，所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻为第一时刻，所述第一时刻为第二时刻与所述网络设备启动所述上行子帧的常规接收的时刻之间的时刻，所述第二时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与所述网络设备之间的距离而确定的。
作为示例，所述第一时间是位于与所述网络设备对应的小区的最远覆盖点处的终端设备与所述网络设备之间的传输时延。在这种情况下，如图7所示，假设近端终端设备1与所述网络设备之间的传输时延小于所述第一时间，远端终端设备2与所述网络设备之间的传输时延大于所述第一时间，则所述近端终端设备1向所述网络设备发送数据所占用的上行子帧到达所述网络设备的时刻早于所述网络设备启动所述上行子帧的常规接收的时刻，而所述远端终端设备2向所述网络设备发送数据所占用的上行子帧到达所述网络设备的时刻晚于所述网络设备启动所述上行子帧的常规接收的时刻，也就是说，在所述一个或更多个终端设备中，可能存在向所述网络设备发送数据所占用的上行子帧到达所述网络设备的时刻晚于所述网络设备的空口上行子帧的终端设备(一旦这个终端设备与所述网络设备之间的传输时延大于所述第一时间)，因此，为保证数据接收的完整性，作为示例，所述终端设备将所述上行子帧的尾部部分符号留作空白，不承载数据，例如，所述终端设备可以将所述上行子帧的最后一个符号留作空白。
作为示例，所述网络设备可以根据所述一个或更多个终端设备的距离分布情况来确定所述第一时间。例如，在所述一个或更多个终端设备中的多数终端距离所述网络设备较近的情况下，所述网络设备可以确定一个较小的第一时间；在所述一个或更多个终端设备中的多数终端距离所述网络设备较远的情况下，所述网络设备可以确定一个较大的第一时间。
参考图8，本申请提供的网络设备的一个实施例，包括发送单元310和处理单元320。
所述处理单元320用于：确定一个时间调整量，所述时间调整量指示与所述网络设备对应的小区内的一个或更多个终端设备向所述网络设备发送数据所占用的上行子帧的起始时刻的调整值。
所述发送单元310用于：将所述时间调整量发送给所述一个或更多个终端设备。
可选地，所述处理单元320还用于：将所述时间调整量确定为使得所述上行子帧的起始时刻为所述网络设备启动所述上行子帧的常规接收的时刻。
可选地，所述处理单元320还用于：将所述时间调整量确定为使得所述上行子帧的起始时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与所述网络设备之间的距离而确定的。
可选地，所述处理单元320还用于：将所述时间调整量确定为使得所述上行子帧的起始时刻为第一时刻，所述第一时刻为第二时刻与所述网络设备启动所述上行子帧的常规接收的时刻之间的时刻，所述第二时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与所述网络设备之间的距离而确定的。
关于本实施例中技术细节和有益效果的详细描述，应参照上述方法实施例。
参考图9，本申请提供的网络设备的另一个实施例，包括发送器410和处理器420。
所述处理器420用于：确定一个时间调整量，所述时间调整量指示与所述网络设备对应的小区内的一个或更多个终端设备向所述网络设备发送数据所占用的上行子帧的起始时刻的调整值。
所述发送器410用于：将所述时间调整量发送给所述一个或更多个终端设备。
可选地，所述处理器420还用于：将所述时间调整量确定为使得所述上行子帧的起始时刻为所述网络设备启动所述上行子帧的常规接收的时刻。
可选地，所述处理器420还用于：将所述时间调整量确定为使得所述上行子帧的起始时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与所述网络设备之间的距离而确定的。
可选地，所述处理器420还用于：将所述时间调整量确定为使得所述上行子帧的起始时刻为第一时刻，所述第一时刻为第二时刻与所述网络设备启动所述上行子帧的常规接收的时刻之间的时刻，所述第二时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与所述网络设备之间的距离而确定的。
关于本实施例中技术细节和有益效果的详细描述，应参照上述方法实施例。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本申请的示例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种上行同步方法，其特征在于，所述方法应用于免许可频段上的LBT机制下的通信系统中，所述方法包括：
    网络设备确定一个时间调整量，所述时间调整量指示与所述网络设备对应的小区内的一个或更多个终端设备向所述网络设备发送数据所占用的上行子帧的起始时刻的调整值；
    所述网络设备将所述时间调整量发送给所述一个或更多个终端设备。
  2. 如权利要求1所述的方法，其特征在于，网络设备确定一个时间调整量，包括：
    所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻为所述网络设备启动所述上行子帧的常规接收的时刻。
  3. 如权利要求1所述的方法，其特征在于，网络设备确定一个时间调整量，包括：
    所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与所述网络设备之间的距离而确定的。
  4. 如权利要求1所述的方法，其特征在于，网络设备确定一个时间调整量，包括：
    所述网络设备将所述时间调整量确定为使得所述上行子帧的起始时刻为第一时刻，所述第一时刻为第二时刻与所述网络设备启动所述上行子帧的常规接收的时刻之间的时刻，所述第二时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与所述网络设备之间的距离而确定的。
  5. 一种网络设备，其特征在于，所述网络设备工作在免许可频段上的LBT机制下，所述网络设备包括：
    确定单元，用于确定一个时间调整量，所述时间调整量指示与所述网络设备对应的小区内的一个或更多个终端设备向所述网络设备发送数据所占用的上行子帧的起始时刻的调整值；
    发送单元，用于将所述时间调整量发送给所述一个或更多个终端设备。
  6. 如权利要求5所述的网络设备，其特征在于，所述确定单元还用于：
    将所述时间调整量确定为使得所述上行子帧的起始时刻为所述网络设备启动所述上行子帧的常规接收的时刻。
  7. 如权利要求5所述的网络设备，其特征在于，所述确定单元还用于：
    将所述时间调整量确定为使得所述上行子帧的起始时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与网络设备之间的距离而确定的。
  8. 如权利要求5所述的网络设备，其特征在于，所述确定单元还用于：
    将所述时间调整量确定为使得所述上行子帧的起始时刻为第一时刻，所述第一时刻为第二时刻与所述网络设备启动所述上行子帧的常规接收的时刻之间的时刻，第二时刻比所述网络设备启动所述上行子帧的常规接收的时刻提前第一时间，所述第一时间是根据所述网络设备对应的小区的最远覆盖点与网络设备之间的距离而确定的。
  9. 一种通信系统，其特征在于，所述通信系统包括终端设备和如权利要求5至8任意一项所述的网络设备。
  10. 一种计算机可读存储介质，用于存储计算机程序，其特征在于，所述计算机程序用于执行如权利要求1至4任意一项所述的方法的指令。
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