WO2018000196A1 - 免授权频段上的通信方法、终端设备以及网络设备 - Google Patents

免授权频段上的通信方法、终端设备以及网络设备 Download PDF

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Publication number
WO2018000196A1
WO2018000196A1 PCT/CN2016/087486 CN2016087486W WO2018000196A1 WO 2018000196 A1 WO2018000196 A1 WO 2018000196A1 CN 2016087486 W CN2016087486 W CN 2016087486W WO 2018000196 A1 WO2018000196 A1 WO 2018000196A1
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WIPO (PCT)
Prior art keywords
time
unit
terminal device
control information
downlink control
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PCT/CN2016/087486
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English (en)
French (fr)
Inventor
郑娟
官磊
马莎
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华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201680086737.7A priority Critical patent/CN109314958A/zh
Priority to EP16906598.4A priority patent/EP3461198B1/en
Priority to PCT/CN2016/087486 priority patent/WO2018000196A1/zh
Priority to BR112018077246-1A priority patent/BR112018077246A2/pt
Priority to JP2018568236A priority patent/JP6663518B2/ja
Publication of WO2018000196A1 publication Critical patent/WO2018000196A1/zh
Priority to US16/233,504 priority patent/US10772126B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a resource allocation method on an unlicensed frequency band, and a terminal device and a network side device.
  • the licensed frequency band resources are limited.
  • operators can provide data services for user equipment through unlicensed frequency bands.
  • the main technology used in the unlicensed band is Wireless Fidelity (Wi-Fi), but the Wireless Local Network (WLAN) Access Point (AP) using Wi-Fi technology is
  • Wi-Fi Wireless Fidelity
  • WLAN Wireless Local Network
  • AP Wireless Local Network
  • QoS Quality of Service
  • simultaneous handling of multi-user scheduling Therefore, the application of Long-term Evolution (LTE) technology to the unlicensed frequency band can not only effectively utilize the unlicensed band resources, but also provide better wireless access and meet the needs of the growing mobile broadband services.
  • LTE Long-term Evolution
  • LAA-LTE Carrier Aggregation-based authorized access-access LA-LTE
  • LAA-LTE Carrier Aggregation-based authorized access-access LA-LTE
  • LBT Listen Before Talk
  • a communication device including a network device such as a base station and/or a terminal device
  • Sending or receiving is opportunistic.
  • the idle channel detection is first performed.
  • the network device acquires a period of resources on the unlicensed band according to a certain resource configuration manner (for example, pre-configured Frame structure) starts data transfer.
  • the transmission channel reserved for the uplink information is set on the unlicensed frequency band.
  • the transmission of the downlink user data is Interrupting, in order to leave resources on the unlicensed band to the uplink information transmission, causing downlink user data transmission of the network device to be destroyed, and reducing data transmission efficiency on the unlicensed band.
  • the embodiment of the invention provides a communication technology on the unlicensed frequency band, and the purpose thereof is to reasonably configure the unlicensed frequency band resource and improve the data transmission efficiency on the unlicensed frequency band.
  • a method of communication over an unlicensed band comprising:
  • the terminal device receives downlink control information sent by the network device, where the downlink control information is located in a first time unit in the set of candidate time units, and the set of candidate time units is at least one time unit of the plurality of consecutive time units.
  • the set of candidate time units is repeated at equal intervals on the plurality of consecutive time units;
  • the start time T1 of the time window is located in the first time unit or in the second time unit, and the second time unit is the next time unit of the first time unit.
  • the end time of the downlink control information is T2, and the terminal device does not perform downlink user data reception during the time interval between the T1 and the T2.
  • the sending, by the terminal device, the uplink information in the time window includes: performing a clear channel detection CCA; and after the CCA detection is successful, sending the uplink message interest.
  • the terminal device receives indication information, where the indication information is used to indicate whether the terminal device has the time window or whether the terminal device is allowed to send the uplink in the time window. information.
  • the indication information indicates that the time window is not available or the uplink information is not allowed to be sent in the time window.
  • a communication method on an unlicensed frequency band including:
  • the network device sends downlink control information in a first time unit, where the first time unit is included in a set of candidate time units, the set of candidate time units being at least one time unit of a plurality of consecutive time units, The set of candidate time units is repeated at equal intervals on the plurality of consecutive time units;
  • the network device receives uplink information according to the sending time of the downlink control information, where the uplink information is located in a time window;
  • the start time T1 of the time window is located in the first time unit or in the second time unit, and the second time unit is the next time unit of the first time unit.
  • the end time of the downlink control information is T2, and the network device does not send downlink user data in the time interval between the T1 and the T2.
  • the network device further sends indication information, where the indication information is used to indicate whether the terminal device has the time window or indicates whether the terminal device is allowed to send the uplink information in the time window.
  • the indication information indicates that the terminal device does not have the time window or is not allowed in the time window. Send the uplink information.
  • a terminal device including:
  • a receiving unit configured to receive downlink control information sent by the network device, where the downlink control information is Located in a first time unit in a set of candidate time units, the set of candidate time units being at least one time unit of a plurality of consecutive time units, the set of candidate time units being equal to the plurality of consecutive time units Repeated intervals;
  • a processing unit configured to determine, according to a sending time of the downlink control information, a time window for sending uplink information
  • a sending unit configured to send the uplink information in the time window
  • the start time T1 of the time window is located in the first time unit or in the second time unit, and the second time unit is the next time unit of the first time unit.
  • the end time of the downlink control information is T2; the receiving unit does not receive downlink user data in a time interval between the T1 and T2.
  • the sending, by the sending unit, sending the uplink information in the time window includes performing a clear channel detection CCA, and sending the uplink information after the CCA detection succeeds.
  • the receiving unit further receives indication information, where the indication information is used to indicate whether the terminal device has the time window or whether the terminal device is allowed to send the Uplink information.
  • the indication information indicates that the time window is not available or the uplink information is not allowed to be sent in the time window.
  • the functional units of the terminal device in this aspect may be implemented by corresponding hardware, or may be executed by corresponding hardware to execute corresponding software.
  • a network device including:
  • a sending unit configured to send downlink control information in a first time unit, where the first time unit is included in a set of candidate time units, the set of candidate time units being at least one time unit of a plurality of consecutive time units And the set of candidate time units is repeated at equal intervals on the plurality of consecutive time units;
  • a receiving unit configured to receive uplink information according to a sending time of the downlink control information, where the uplink information is located in a time window;
  • the start time T1 of the time window is located in the first time unit or in the second time unit, and the second time unit is the next time unit of the first time unit.
  • the end time of the downlink control information is T2; the sending unit does not send downlink user data in a time interval between the T1 and T2.
  • the sending unit is further configured to send indication information, where the indication information is used to indicate whether the terminal device has the time window or whether to allow the terminal device to send the uplink information in the time window.
  • the sending unit when the sending unit sends downlink user data in the first time unit, the indication information indicates that the terminal device does not have the time window or is not allowed in the time window. Send the uplink information.
  • the functional units of the terminal device in this aspect may be implemented by corresponding hardware, or may be executed by corresponding hardware to execute corresponding software.
  • the start time T1 of the time window is the start time of the second time unit; or the end time T2 of the downlink control information is the nth time in the first time unit
  • the OFDM symbol, the start time T1 of the time window is the n+2th OFDM symbol in the first time unit.
  • the T2 is an end time of the nth OFDM symbol in the first time unit
  • the T1 is a start time of the n+2th OFDM symbol in the first time unit.
  • the end time of the downlink control information is T2, wherein the time interval T between the T1 and the T2 is a transceiving conversion time.
  • the downlink control information includes a discovery reference signal DRS and/or common control information.
  • the uplink information includes uplink information in a random access process, One or more of an uplink transmission scheduling request SR, a sounding reference signal SRS, and periodic channel state information P-CSI.
  • the time unit is a subframe.
  • the set of candidate time units may include one time unit or multiple time units.
  • the solution provided in the embodiment of the present invention shortens the time interval between the time when the terminal device ends receiving the downlink control information and the start time of the time window for transmitting the uplink information.
  • This method reduces the impact of downlink user data transmission on the unlicensed band and improves the data transmission efficiency on the unlicensed band.
  • FIG. 1 is a schematic diagram of an application scenario of an unlicensed band communication according to an embodiment of the present invention
  • 2 is a schematic diagram of resource allocation on an existing unlicensed band
  • FIG. 3 is a schematic flowchart of a communication method on an unlicensed frequency band according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a DRS signal according to an embodiment of the present invention.
  • 5-1 is a schematic diagram of a possible resource allocation on an unlicensed frequency band according to an embodiment of the present invention.
  • FIG. 5-3 is a schematic diagram of still another possible resource allocation on an unlicensed frequency band according to an embodiment of the present disclosure.
  • FIG. 6-1 is a set of a candidate time unit on an unlicensed frequency band according to an embodiment of the present invention. Schematic diagram of possible resource allocation
  • 6-2 is a schematic diagram of another possible resource allocation on a set of candidate time units on an unlicensed frequency band according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
  • the solution of the present invention is applied to a wireless communication system, in particular, an LTE system using an unlicensed band communication, such as an LTE system (LAA-LTE) that is licensed to access a LAA, and a LTE based on Dual Connectivity (DC).
  • LAA-LTE LTE system
  • DC Dual Connectivity
  • LAA-LTE system Take the LAA-LTE system as an example.
  • the carrier aggregation Carrier Aggregation, CA for short
  • PCC primary component carrier
  • the carrier on the unlicensed band is the secondary component carrier (Secondary Component Carrier, Referred to as SCC) or Secondary Cell (SCell).
  • the LTE device can inherit the traditional advantages for wireless communication by using the carrier on the licensed frequency band, and can implement the offloading by using the carrier on the unlicensed frequency band to reduce the load of the carrier on the licensed frequency band.
  • the LAA-LTE system uses unlicensed band resources, it is required to comply with the specification of the unlicensed band.
  • the carrier included in the licensed band or the licensed band or the cell working in the licensed band is used as the primary cell
  • the carrier included in the unlicensed band or the unlicensed band or the cell working in the unlicensed band is used as the secondary cell.
  • the primary cell and the secondary cell may be deployed in a common station or a non-common station, and an ideal backhaul path between the two cells.
  • the network architecture may also include cells that operate independently on the unlicensed band. That is, the cell working in the unlicensed band can directly provide independent access function, and does not need to work through the cell in the licensed band, such as the Standalone LTE-U system.
  • the embodiment of the present invention is not limited to the foregoing network architecture, and may further include other network architectures that can implement the solutions provided by the embodiments of the present invention.
  • the network device involved in the present invention is a network element network element except for the terminal device, and may be a base station, or a cell, or an access point, or a core network, or an access network element.
  • the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station may be a base station in a Global System for Mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, or may be a Wideband Code Division Multiple Access (Wideband Code Division).
  • GSM Global System for Mobile communications
  • CDMA Code Division Multiple Access
  • Wideband Code Division Wideband Code Division Multiple Access
  • a base station (NodeB) in a multiple access wireless (WCDMA) system may also be an evolved base station (eNB or e-NodeB) in LTE.
  • the cell may be a cell corresponding to the base station, and the cell may belong to a macro base station, or may belong to a base station corresponding to a small cell, where the small cell may include: a metro cell, a micro cell, and a micro cell. Pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.
  • the embodiment of the present invention is not limited to the foregoing network device, and may further include other network devices that can implement the solution provided by the embodiment of the present invention.
  • the terminal device involved in the present invention may be a device that provides voice and/or data connectivity to a user, a handheld device with wireless connectivity, or other processing device that is connected to a wireless modem.
  • the wireless device or unit may be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, a portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile device. They exchange language and/or data with the radio access network.
  • PCS Personal Communication Service
  • SIP Session Initiation Protocol
  • WLL wireless local loops
  • PDA personal digital assistant
  • a wireless terminal may also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, or an access point.
  • Remote Terminal, Access Terminal, User Terminal, User Agent, User Device, or User Equipment may further include a relay relay, and the base station may perform data communication as a terminal device.
  • the terminal device in the present invention may also be a terminal device in a non-wireless resource link state. The embodiment of the invention is not specifically limited.
  • LBT Listen Before Talk
  • CCA Clear Channel Assessment
  • the communication device can detect whether the channel is idle by means of signal detection, energy detection, or the like. For example, if the signal is detected, if no specific signal is detected (for example, the signal can be a preamble for the Wi-Fi system), the channel can be considered idle; at this time, the communication device can use the unlicensed band for data. transmission. For another example, if the energy detection method is adopted, if the received or detected energy is lower than a certain threshold, the channel can be considered as idle, and the communication device can use the unlicensed frequency band for data transmission.
  • the data transmission on the unlicensed band does not apply a fixed frame structure.
  • the network device for example, the base station or the cell, may determine the duration of the downlink user data transmission and/or the transmission duration of the uplink data after preempting the unlicensed band resource according to the downlink traffic load and/or the uplink traffic load, or other considerations, and may be based on The service demand adjusts the uplink and downlink transmission modes on the unlicensed band resources, thereby improving the resource utilization efficiency on the unlicensed band.
  • MCOT Maximum Channel Occupancy Time
  • the duration of the downlink user data transmission cannot be greater than the MCOT
  • the duration of the uplink data transmission cannot be greater than the MCOT.
  • the sum of the durations of one continuous downlink user data transmission and one continuous uplink data transmission duration cannot be greater than the MCOT.
  • MCOT refers to the maximum length of time that a network device or a terminal device can perform data transmission on the preempted unlicensed band resource after preempting the unlicensed band resource without reevaluating the availability of the unlicensed band resource.
  • a portion composed of a downlink burst data transmission and/or an uplink burst data transmission included in each Transmission Opportunity (TxOP) may be understood as a frame structure.
  • the frame structure included in different TxOPs may be different, and the transmission duration in the TxOP is not greater than MCOT.
  • the reserved transmission channel is set on the unlicensed frequency band resource, and the reserved transmission channel is used for the communication device to transmit information.
  • the interval may be a periodic interval or a non-periodic interval, and the specific interval time is determined according to the type of information transmitted.
  • the reserved transport channel may be a physical random access channel (PRACH), and the channel resource is periodically configured in time; or may be used for a scheduling request (Scheduling Request, short for short)
  • An uplink resource of the SR the uplink resource is also periodically configured in time; or may be an uplink resource used for transmitting a Sounding Reference Signal (SRS), and the uplink resource is also periodically configured in time;
  • it may be an uplink resource for transmitting a Hybrid Automatic Repeat Request (Acknowledgment, abbreviated as HARQ-ACK), where the HARQ-ACK includes at least an acknowledgement response (ACK) and a negative acknowledgement (Negative Acknowledgement).
  • HARQ-ACK Hybrid Automatic Repeat Request
  • the uplink resource of the HARQ-ACK is also periodically configured in time; or it may be an uplink resource for transmitting Channel State Information (CSI), which is also a period in time. Alternatively, it may be a Physical Uplink Control Channel (PUCCH), which is periodically configured in time.
  • CSI Channel State Information
  • PUCCH Physical Uplink Control Channel
  • the network device (such as a base station or a cell) needs to transmit data through the unlicensed band resource. After the idle channel is detected, the network device competes to obtain a resource on the unlicensed band. The duration is MCOT. After the network device competes for the unlicensed band resource, the downlink user data is transmitted according to the configured frame structure, and the frame structure of the configuration may be determined according to the downlink service requirement. In the unlicensed band, the reserved location of the PRACH appears in the above-mentioned resources that the network device competes for, although the network device does not reach the MCOT constraint time after competing for the resource on the unlicensed band.
  • the length must also interrupt the transmission of downlink user data to use the reserved resources on the unlicensed band for PRACH transmission.
  • the network device After the PRACH transmission ends, the network device also needs to perform idle channel detection again to determine whether resources on the unlicensed band are available to determine whether the transmission of the downlink user data that can be interrupted can continue. In this case, the downlink data transmission of the network device is destroyed, and the data transmission efficiency on the unlicensed band is affected.
  • the terminal device may also need to perform idle channel detection to determine whether the unlicensed band resource is available; for example, if the reserved uplink resource is on the MCOT corresponding to the downlink user data transmission, the terminal device is reserved.
  • the data transmitted on the uplink resource may not evaluate the availability of the unlicensed band resource; if the reserved uplink resource exceeds the MCOT corresponding to the downlink user data transmission, the terminal device needs to evaluate the unlicensed band on the reserved uplink resource. Availability of resources. This situation further reduces the efficiency of data transmission over the unlicensed band.
  • FIG. 2 shows an example.
  • the network device determines that data transmission is possible in the subframe n through the CCA, the network device performs downlink user data transmission from the subframe start boundary of the subframe n, in the subframe n+m.
  • the end of the sub-frame ends the data transfer (m is equal to 5). Further, from the subframe of the subframe n
  • the length of time between the start boundary and the end boundary of the subframe of the subframe n+m is not greater than the MCOT.
  • the terminal device may also need to detect the idle channel before transmitting the uplink information, thereby reducing the unlicensed frequency band. Data transmission efficiency.
  • the embodiment of the present invention provides a communication technology on an unlicensed frequency band, which reduces the impact on the frame structure design of the unlicensed frequency band by rationally configuring the data transmission position in the unlicensed frequency band, and improves the data transmission efficiency on the unlicensed frequency band.
  • the downlink control information may be a Discovery Reference Signal (DRS), or a common control information (such as downlink control information carried by a common control channel), or may be applicable to the present disclosure.
  • DRS includes a Cell-specific Reference Signal (CRS), a Secondary Synchronization Signal (SSS), a Primary Synchronization Signal (PSS), and a configurable channel state.
  • CRS Cell-specific Reference Signal
  • SSS Secondary Synchronization Signal
  • PSS Primary Synchronization Signal
  • CSI-RS Channel State Information Reference Signals
  • the common control information includes all or part of the information carried in the System Information Block Type 1 (SIB1), or all or part of the information carried by the Physical Broadcast Channel (PBCH). It can also be all or part of the information carried by other system information block types (SIBs).
  • SIB1 System Information Block Type 1
  • PBCH Physical Broadcast Channel
  • the uplink information may be at least one of the following information: all or part of the uplink information and the sounding reference signal included in the physical random access channel (PRACH) ( Sounding Reference Signal,
  • PRACH Physical Random access channel
  • the SRS is referred to as a Scheduling Request (SR), a Channel State Information (CSI), or the like, or other types of uplink information that are applicable to the embodiments of the present invention.
  • SR Scheduling Request
  • CSI Channel State Information
  • FIG. 3 is a flowchart of a communication method on an unlicensed frequency band according to an embodiment of the present invention, which specifically includes:
  • the network device sends downlink control information in a first time unit, where the first time unit is included in a candidate time unit set, where the candidate time unit set is at least one time unit of a plurality of consecutive time units.
  • the set of candidate time units is repeated at equal intervals on the plurality of consecutive time units.
  • the terminal device receives the downlink control information sent by the network device.
  • the unlicensed frequency band may be divided into a plurality of consecutive time units in the time domain, and the time unit may be a subframe.
  • the set of candidate time units may, for example, comprise six candidate time units, one of which is present in every 40 consecutive time units.
  • the network device sequentially performs CCA in the six time units included in the candidate unit set, and sends the downlink control signal after the CCA succeeds.
  • the time unit that actually transmits the downlink control signal is the first time unit. If the network device fails to obtain an opportunity to transmit a downlink control signal in six of the candidate unit sets (eg, the CCA is not successful), then the downlink needs to be attempted to be sent in the next candidate time unit set. control signal.
  • the terminal device determines, according to the sending time of the downlink control information, a time window for sending uplink information.
  • S304 The network device receives the uplink information according to a sending time of the downlink control information.
  • the start time T1 of the time window is located in the first time unit or in the second time unit, the second time unit is the next time unit of the first time unit, and the downlink control information is The end time is T2.
  • the following takes the downlink control information as a DRS signal as an example, and details the steps S302-S304.
  • a person skilled in the art may understand that the following embodiments only use the DRS signal as an example for explanation.
  • the scope of protection of the present invention is not limited to the case where the downlink control information is DRS, and the other parts mentioned in the present invention satisfy the implementation of the present invention.
  • the specific structure of the DRS is as shown in FIG. 4, in which the DRS region includes 12 OFDM symbols in time, but not every OFDM symbol has valid data.
  • the PRB physical resource block
  • the PRB is 1 ms in time, includes 12 subcarriers in frequency, and one resource element (Resource Element, RE for short) is 1 in time.
  • the OFDM symbol is a subcarrier in frequency.
  • the terminal device ends receiving the downlink control information at time T2, and the start time of the time window in which the terminal device sends the uplink information is T1, and the T1 and T2 exist between the T1 and the T2. time interval.
  • the location of the T1 moment can be set by various optional implementations, as follows:
  • the location at the time T1 is set such that the terminal device does not receive downlink user data during the time interval between T1 and T2. For example, if the network device does not send downlink user data during the period of time, or the terminal device does not receive downlink user data within the time interval, the network device does not send downlink user data.
  • the time interval between T1 and T2 is set to be insufficient for one downlink user data transmission scheduling, so that the new downlink user data can be prevented from being transmitted when the time interval is large enough to allow new downlink user data transmission.
  • the implementation manner can ensure that after the terminal device receives the downlink control information, before the uplink information is sent, no other downlink user data transmission occurs, thereby avoiding the downlink user performed by the network device in the time interval. Data transmission is interrupted or aborted, improving the efficiency of data transmission on the unlicensed band.
  • the T1 time is a start time of the second time unit, or the T2 is an nth OFDM symbol in the first time unit, and the T1 is the The n+2th OFDM symbol within a time unit.
  • the T2 is the nth OFDM in the first time unit At the end of the symbol
  • the T1 is the start time of the n+2th OFDM symbol in the first time unit.
  • the network device sends a DRS on the subframe n
  • the terminal device detects or receives the DRS in the subframe n
  • the start time of the subframe n+1 or the start time of the 14th symbol of the subframe n is taken as the start time T1 of the time window.
  • the implementation considers both the delay that the downlink control information transmission may occur, and the start time T1 of the time window for the transmission of the uplink information starts from a complete time boundary.
  • the T1 is a time after the T2 time and only after the transmission and reception conversion time.
  • the transceiving conversion time includes a conversion time between the end of the downlink user data transmission and the start of the uplink data reception by the network device; for the terminal device, the terminal device includes the end of the downlink user data reception.
  • the conversion time between uplink data transmissions may be no more than 17 microseconds; for a terminal device, the transceiving conversion time may be no more than 20 microseconds.
  • the network device transmits a DRS on a subframe n, the DRS region includes 12 OFDM symbols in time, the terminal device detects or receives the DRS in the subframe n, and ends receiving the DRS at the time T2. .
  • the time T2 is the time T1 after the transceiving conversion time, that is, the time after the 13th OFDM symbol included in the subframe n begins to undergo a transceiving conversion time, the uplink information is sent to the terminal device. The starting moment of the time window.
  • the terminal device can send the uplink information after receiving the DRS, and does not need to wait for any time, avoiding the channel being preempted by other communication devices, and improving the transmission of the unlicensed band. effectiveness.
  • the candidate time unit set is at least one time unit of a plurality of consecutive time units, and the candidate time unit set may include one time unit, or may include multiple time units. .
  • the network device is The downlink control information is sent in the one time unit, and the terminal device detects and receives the downlink control information in the one time unit.
  • the network device sends the downlink control information on one of the multiple time units, and the terminal device detects and receives the Downstream control information.
  • the time window corresponding to the periodically occurring DRS measurement time configuration may be used to send the DRS.
  • the network device determines the transmission location of the DRS through the CCA and transmits the DRS.
  • the DMTC may be a time period of up to 6 ms, that is, 6 subframes, or the DMTC is a time period in which the length can be configured, for example, a time period from 1 ms to 10 ms, that is, 1 to 10 subframes.
  • Each subframe may be used to transmit the DRS, and the transmittable location for the DRS occupies 12 symbols of each subframe.
  • the set of candidate time units is repeatedly equally spaced on the plurality of consecutive time units, that is, the candidate time unit sets are periodically configured on the plurality of consecutive time units.
  • the location of the time unit for receiving the downlink control information by the terminal device in the candidate time unit set is not fixed, it may be implemented in a period in which each candidate time unit set is located.
  • the terminal device can receive the downlink control information, and at the same time, the terminal device can send the uplink information in each of the periods.
  • the terminal device determines, according to the downlink control information, a time window for transmitting uplink information, and sends the uplink information in the time window.
  • the terminal device may perform the idle channel detection CCA or the idle channel detection CCA, and the specific implementation manner may be as follows:
  • a time interval between the time T2 at which the terminal device ends receiving the downlink control information and the start time T1 of the time window used to send the uplink information is sufficiently short to be insufficient by other communication devices. Competition or preemption. Therefore, the terminal device does not need to perform a CCA operation before transmitting the uplink information.
  • the terminal device performs CCA before transmitting the uplink information, but the CCA time may be within the time window or may be outside the time window.
  • the CCA operation is completed before the time window starts, that is, the CCA operation does not occupy the time in the time window.
  • the terminal device performs CCA detection in the time window, and after the CCA detection is successful, the terminal device sends the uplink information.
  • the terminal device may perform CCA detection before or at the start time of each time unit until the CCA detection is successful, and determine a time unit in the time window. If idle, the terminal device starts to send the uplink information.
  • the time of the CCA detection may be different depending on whether the interception mechanism of the random backoff is included, and is not specifically limited herein.
  • the terminal device sends the uplink information in the time window, and the start time T1 of the time window may be configured in multiple manners:
  • the time T1 is specified by a standard protocol.
  • the terminal device sends the uplink information by using the time window with the starting time being T1 according to the standard protocol.
  • the time T1 is configured by signaling
  • the signaling may be Radio Resource Control (RRC) signaling or Medium Access Control (MAC) signaling. It can be physical layer signaling.
  • the signaling may be broadcast signaling in RRC signaling, and may also be physical layer common control signaling, or may be group broadcast signaling in RRC signaling, that is, only some terminals in the system.
  • the device is valid and can also be the common control information of the physical layer group, that is, it is only valid for some terminal devices in the system.
  • the start time T1 of the time window may also be notified by the network device through the common control channel, and the common control channel may be sent in the same time unit as the downlink control information, for example, the first time unit. , or in other pre-configured or available time units.
  • the time units carrying the common control channel may also be periodically distributed.
  • the terminal device sends an uplink message in the time window.
  • the length of time for sending the uplink information in the time window may be a fixed length, or may be configured as needed.
  • the length of time for sending the uplink information may be: one OFDM symbol, one subframe, one slot (0.5 millisecond), or other integer OFDM symbols.
  • the length of the time resource used to send the uplink information may be pre-configured or signaled.
  • the time length is directly defined by a standard protocol; or the time length is configured by signaling, where the signaling may be RRC signaling, MAC signaling, or physical layer signaling (for example, physical layer common control signaling) ).
  • the network device further sends indication information, and the terminal device receives the indication information, and determines, according to the indication information, whether to send uplink information in the time window.
  • the indication information may be used to indicate whether the terminal device has the time window, or whether the terminal device is allowed to send uplink information in the time window.
  • the indication information may have multiple implementations as follows:
  • the terminal device determines whether the time window is available according to the presence or absence of the indication information, or whether uplink information can be sent in the time window. For example, if the terminal device does not detect the indication information, it indicates that the terminal device has the time window, or the terminal device may send uplink information in the time window, and the terminal device is in the time window.
  • Sending the uplink information for example, if the terminal device detects the indication information, indicating that the terminal device has the time window, or the terminal device can send uplink information in the time window, the terminal device is The time window sends uplink information; for example, if the terminal device detects the indication information, it indicates that the terminal device does not have the time window, or the terminal device is not allowed to send uplink information in the time window, The terminal device does not send the uplink information in the time window; finally, if the terminal device does not detect the indication information, it indicates that the terminal device does not have the time window, or the terminal device is not allowed to be in the The time window sends uplink information, and the terminal device does not send uplink information in the time window.
  • the indication information notification indicates whether the terminal device has the time window, or whether the terminal device is allowed to send uplink information in the time window. For example, if The indication information indicates that the terminal device has the time window, or allows the terminal device to send uplink information in the time window, and the terminal device sends uplink information in the time window. For another example, if the indication information indicates that the terminal device does not have the time window, or the terminal device is not allowed to send uplink information in the time window, the terminal device does not send uplink information in the time window. In this implementation manner, the terminal device may directly determine, according to the content indicated by the indication information, whether to send uplink information on the time window.
  • the indication information may be public control information. Sending the indication information to the terminal device through the common control information can save the overhead of signaling. Further optionally, the common control information may also be used to indicate an end position of a downlink data burst including the indication information.
  • the downlink data burst can be understood as the length of time that the network device continuously transmits the downlink data on the unlicensed band resource after preempting the unlicensed band resource. In this way, the existing signaling design can be reused without introducing an additional design method, which reduces the complexity of the communication system design.
  • the network device may only send the downlink control information (as shown in FIG. 6-1), or send the downlink control information and the And indicating the indication information, or sending the downlink user data in addition to the downlink control information, or the downlink control information and the indication information.
  • the downlink user data includes data carried in a Physical Downlink Shared Channel (PDSCH) but not broadcast data.
  • the data may be included in a Physical Downlink Control Channel (PDCCH), and may also include data carried in an Enhanced Physical Downlink Control Channel (E-PDCCH), and may also include Data carried in a Physical Multicast Channel (PMCH).
  • PDSCH Physical Downlink Shared Channel
  • PMCH Physical Multicast Channel
  • the downlink user data may further include a downlink reference signal, where the downlink reference signal includes at least one of the following: a cell-specific reference signal (Cell-specific Reference Signal, CRS for short), and a multimedia broadcast multicast service single-frequency network reference signal (Multimedia) Broadcast Multicast Service Single Frequency Network Reference Signal (MBSFN RS), a UE-specific reference signal (DM-RS) for demodulating PDSCH bearer data, used to demodulate EPDCCH or MPDCCH bearer data.
  • the reference signal (DeModulation Reference Signal, DM-RS for short), the Positioning Reference Signal (PRS), and the CSI Reference Signal (CSI-RS).
  • the network device may indicate, by using the foregoing indication information, that the terminal device is not in the time, in order to not affect the frame structure design on the unlicensed frequency band.
  • the window sends uplink information, or does not send uplink information in a part of the time unit included in the time window. See the implementation in the following cases for details:
  • the network device sends downlink user data in addition to the downlink control information in the first time unit in the candidate time set.
  • the sending of the downlink user data and the uplink information of the terminal device in the time window may occur because a start time of a time window for sending the uplink information may be located in the first time unit.
  • the transmission causes a collision, which causes the transmission of the downlink user data to be suspended or interrupted, thereby affecting the transmission efficiency.
  • the network device sends indication information to the terminal device, indicating that the terminal device does not send uplink information in the time window to avoid collision with the transmission of the downlink user data.
  • the time window includes a partial time unit
  • the partial time unit may be a time unit in which the network device transmits downlink user data in the candidate time unit set.
  • the network device sends the indication information to notify the terminal device that the uplink information is not sent by the part of the time unit of the time window.
  • the terminal device also needs to know the partial time unit included in the time window. For example, the terminal device determines a start time of the time window, and then determines a partial time unit included in the time window described above according to an end time of the network device transmitting the downlink user data in the candidate time unit set.
  • the network device may further determine, according to multiple manners, whether the terminal device is allowed to send uplink information in the time window. For example, the network device does not allow the terminal device to access The network device needs to start sending new downlink control information or data after the downlink control information is sent, or the network device does not allow the terminal device to send uplink information for other reasons. limited.
  • the network device may transmit the indication information at a plurality of locations, such as at the first time unit or a time unit prior to the first time unit.
  • the network device receives the uplink information according to the sending time of the downlink control information, where the network device determines that the network device determines the sending time according to the sending time of the downlink control information. a time window and receiving the uplink information within the time window.
  • the specific implementation manner of the terminal device for determining the time window according to the sending time of the downlink control information is also applicable to the network device. For details, refer to the specific description of the foregoing operations of the terminal device.
  • FIG. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • the terminal device includes a detecting unit 701, a receiving unit 702, a processing unit 703, and a sending unit 704, and may further include a storage unit according to actual needs, which is not shown in the figure.
  • the detecting unit 701 is configured to detect whether there is downlink control information transmission on the unlicensed frequency band.
  • the receiving unit 702 is configured to receive the downlink control information after the detecting unit 701 detects the downlink control information.
  • the network device sends the downlink control information in a first time unit on the set of candidate time units, and the terminal device detects the downlink control information on the set of candidate time units, and at the first time The downlink control information is received in the unit.
  • the candidate time unit set is at least one time unit of a plurality of consecutive time units, and the set of candidate time units is repeated at equal intervals on the plurality of consecutive time units.
  • the processing unit 703 is configured to determine, according to a sending time of the downlink control information, a time window for sending uplink information.
  • the sending unit 704 is configured to send the uplink information in the time window.
  • the start time T1 of the time window is located in the first time unit or the second time list
  • the second time unit is the next time unit of the first time unit
  • the end time of the downlink control information is T2.
  • the communication method on the unlicensed frequency band provided by the embodiment of the invention shortens the time interval between the reception of the downlink control information and the transmission of the uplink information, maintains the frame structure design on the unlicensed frequency band, and improves the unlicensed frequency band. Data transmission efficiency.
  • the function of the detecting unit 701 may be implemented by the processing unit 703, or the detecting unit 701 may be integrated in the processing unit 703, that is, the terminal device may not include The detection unit 701 is independent.
  • the possible structure of the terminal device provided by the embodiment of the present invention is described below by taking the downlink control information as a DRS signal as an example.
  • DRS downlink control information
  • a person skilled in the art may understand that the following embodiments only use the DRS signal as an example for explanation.
  • the scope of protection of the present invention is not limited to the case where the downlink control information is DRS, and the other parts mentioned in the present invention satisfy the implementation of the present invention.
  • the manner of any type of downlink control information required by the example is described below by taking the downlink control information as a DRS signal as an example.
  • the receiving unit 702 ends receiving the downlink control information at time T2, and the sending time of the time window in which the sending unit 704 sends the uplink information is T1, the T1 and There is a time interval between T2.
  • the location of the T1 moment can be set by various optional implementations, as follows:
  • the location at the time T1 is set such that the terminal device does not receive downlink user data during the time interval between T1 and T2. For example, if the network device does not send downlink user data during the period of time, or the terminal device does not receive downlink user data within the time interval, the network device does not send downlink user data.
  • the time interval between T1 and T2 is set to be insufficient for one downlink user data transmission scheduling, so that the new downlink user data can be prevented from being transmitted when the time interval is large enough to allow new downlink user data transmission.
  • the implementation manner can ensure that after the terminal device receives the downlink control information, before the uplink information is sent, no other downlink user data transmission occurs, thereby avoiding the downlink user performed by the network device in the time interval. Data transfer is interrupted or aborted, increasing exemption Data transmission efficiency on the frequency band.
  • the T1 is a start time of the second time unit, or the T2 is an nth OFDM symbol in the first time unit, and the T1 is the first time The n+2th OFDM symbol within the time unit.
  • the T2 is an end time of the nth OFDM symbol in the first time unit
  • the T1 is a start time of the n+2th OFDM symbol in the first time unit.
  • the network device sends the DRS on the subframe n
  • the detecting unit 701 or the processing unit 703 detects the DRS in the subframe n
  • the receiving unit 702 ends the receiving of the DRS at the time T2
  • the start time of the subframe n+1 or the start time of the 14th symbol of the subframe n is taken as the start time T1 of the time window.
  • the implementation considers both the delay that the downlink control information transmission may occur, and the start time T1 of the time window for the transmission of the uplink information starts from a complete time boundary.
  • the T1 is a time after the T2 time and only after the transmission and reception conversion time.
  • the candidate time unit set is at least one time unit of a plurality of consecutive time units, and the candidate time unit set may include one time unit, or may include multiple time units. .
  • the network device transmits the downlink control information in the one time unit, and the detecting unit 701 or the processing unit 703 detects in the one time unit.
  • the receiving unit 702 receives the downlink control information to the downlink control information.
  • the network device sends the downlink control information on one of the multiple time units, and the detecting unit 701 or the processing unit 703 The downlink control information is detected, and the receiving unit 702 receives the downlink control information.
  • the set of candidate time units is equally spaced on the plurality of consecutive time units Repeating, that is, periodically configuring the set of candidate time units on the plurality of consecutive time units.
  • the processing unit 703 determines a time window for transmitting uplink information according to the downlink control information, and notifies the sending unit 704 to send the uplink information in the time window. Before the sending of the uplink information, the processing unit 703 may perform the idle channel detection CCA or the idle channel detection CCA, and the specific implementation manner may be as follows:
  • the time interval between the time T2 and the T1 is sufficiently short to be competed or preempted by other communication devices. Therefore, the sending unit 704 does not need to perform a CCA operation before transmitting the uplink information.
  • the processing unit 703 performs CCA before the transmitting unit 704 sends the uplink information, but the CCA time may be within the time window or may be outside the time window.
  • the processing unit 703 completes the CCA operation before the start of the time window, that is, the CCA operation does not occupy the time within the time window.
  • the processing unit 703 performs CCA detection in the time window. After the CCA detection is successful, the sending unit 704 sends the uplink information.
  • the processing unit 703 may perform CCA detection before or at the start time of each time unit until the CCA detection is successful, determining that the time window is When a time unit is idle, the notification sending unit 704 sends the uplink information.
  • the terminal device sends the uplink information in the time window, and the start time T1 and the time length of the time window may be configured in multiple manners, and the specific configuration is performed.
  • the manner refer to the description of the method embodiment corresponding to FIG. 3, and details are not described herein again.
  • the network device further sends indication information
  • the receiving unit 702 receives the indication information
  • the processing unit 703 acquires the indication information from the receiving unit 702, and according to the indication information Notifying the sending unit 704 whether to send uplink information in the time window.
  • the indication information refer to the description of the method embodiment corresponding to FIG. 3.
  • the network device may send only the downlink control information, or send the downlink control information and the indication information, or In addition to the control information, or the downlink control information and the indication information, downlink user data is also transmitted.
  • the network device may indicate, by using the foregoing indication information, that the terminal device does not send uplink information in the time window, in order to not affect the frame structure design on the unlicensed frequency band.
  • the receiving unit 702 receives the indication information, and the processing unit 703 acquires the indication information from the receiving unit 702, and determines and notifies the sending unit 704 whether to send the uplink information.
  • the terminal device provided by the embodiment of the present invention detects downlink control information sent by the network device, determines a time window for performing uplink information transmission, and performs transmission of the uplink information.
  • the solution of the embodiment of the invention shortens the time interval for transmitting the uplink information and receiving the downlink control information, maintains the frame structure design on the unlicensed band, and improves the data transmission efficiency on the unlicensed band.
  • the terminal device in the embodiment of the present invention may be used to perform the method in the foregoing method embodiment, where the terminal device performs downlink control information reception, determines a time window for sending uplink information, and the uplink information.
  • the terminal device performs downlink control information reception, determines a time window for sending uplink information, and the uplink information.
  • the terminal device performs downlink control information reception, determines a time window for sending uplink information, and the uplink information.
  • the specific functions of the detecting unit 701, the receiving unit 702, the processing unit 703, and the transmitting unit 704 included in the terminal device respectively correspond to the functions in the embodiment corresponding to FIG. 3 described above; wherein the terms and implementation details and the method embodiments are similar.
  • the functional unit of the terminal device in this embodiment may be implemented by corresponding hardware, or may be implemented by corresponding hardware, for example, the foregoing receiving unit 702 may be executed.
  • the foregoing hardware of the receiving module function such as the receiver, may also be a general processor or other hardware device capable of executing the corresponding computer program to perform the foregoing functions.
  • the foregoing sending unit 704 may have the function of executing the foregoing sending module.
  • the hardware, such as a transmitter may also be a general processor or other hardware device capable of executing a corresponding computer program to perform the foregoing functions; and the processing unit 703 as described above may be a separate hardware having the function of executing the processing module, such as processing.
  • the detecting unit 701 may be independent hardware having a function of executing a processing module, such as a detector; or may be integrated in the processing unit 703, and implemented by a processor or the like to implement a hardware function of the processing module. Separate detection units 701 are provided separately.
  • FIG. 8 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
  • the network device includes a sending unit 801, a processing unit 802, and a receiving unit 803, and may further include a storage unit according to actual needs, which is not shown in the figure.
  • the sending unit 801 sends downlink control information on a set of candidate time units on the unlicensed frequency band, where the downlink control information is received by the terminal device.
  • the sending unit 801 sends the downlink control information in a first time unit of the candidate time unit set.
  • the candidate time unit set is at least one time unit of a plurality of consecutive time units, and the set of candidate time units is repeated at equal intervals on the plurality of consecutive time units.
  • the receiving unit 803 receives the uplink information sent by the terminal device according to the sending time of the downlink control information.
  • the terminal device determines a time window for transmitting the uplink information according to the sending time of the downlink control information, where the start time T1 of the time window is located in the first time unit or in the second time unit, where the The second time unit is the next time unit of the first time unit, and the end time of the downlink control information is T2.
  • the processing unit 802 determines a set of candidate time units that transmit the downlink control information, and determines the first time unit.
  • the possible structure of the network device provided by the embodiment of the present invention is described below by taking the downlink control information as a DRS signal as an example.
  • DRS downlink control information
  • a person skilled in the art may understand that the following embodiments only use the DRS signal as an example for explanation.
  • the scope of protection of the present invention is not limited to the case where the downlink control information is DRS, and the other parts mentioned in the present invention satisfy the implementation of the present invention. Any type of downgrade required by the example The way information is controlled.
  • the sending unit 801 sends downlink control information on a first time unit of the set of candidate time units, and the terminal device ends receiving the downlink control information at time T2 (considering The network delay, the time at which the sending unit 801 ends the transmission of the downlink control information may be slightly earlier than the time T2, where the time at which the terminal device ends receiving the downlink control information is based on the time T2, the terminal
  • the starting time of the time window in which the device sends the uplink information is T1, and there is a time interval between the T1 and the T2.
  • T2 For the location design of the T2, there are a plurality of optional implementations. For the specific implementation, refer to the description of the method embodiment corresponding to FIG. 3, and details are not described herein again.
  • the sending unit 801 of the network device does not send downlink user data during the time interval between T1 and T2.
  • the processing unit 802 notifies the sending unit that the downlink user data transmission scheduling is insufficient for the time interval, and the sending unit 801 does not send the downlink user data; for example, whether the time interval is sufficient for scheduling For one downlink user data transmission, since the terminal device does not receive downlink user data within the time interval, the processing unit 802 notifies the sending unit 801 not to transmit downlink user data within the time interval.
  • the candidate time unit set is at least one time unit of a plurality of consecutive time units, and the candidate time unit set may include one time unit, or may include multiple time units. .
  • the sending unit 801 transmits the downlink control information in the one time unit.
  • the processing unit 802 determines one time unit in the plurality of time units, and notifies the sending unit 801 in the determined one time unit. Sending the downlink control information.
  • the set of candidate time units is repeatedly equally spaced on the plurality of consecutive time units, that is, the candidate time unit sets are periodically configured on the plurality of consecutive time units.
  • the sending unit 801 further sends indication information, where the indication information indicates the end
  • the end device determines whether to send uplink information in the time window.
  • the indication information may be used to indicate whether the terminal device has the time window, or whether the terminal device is allowed to send uplink information in the time window.
  • the indication information may be implemented in various manners. For the specific implementation manner, refer to the description in the method embodiment corresponding to FIG. 3, and details are not described herein again.
  • the processing unit 802 may instruct the sending unit 801 to send only the downlink control information, or send the downlink control information and the Instructing information, or in addition to the downlink control information, or the downlink control information and the indication information, may also send downlink user data.
  • the processing unit 802 may pass the foregoing indication, in order not to affect the frame structure design on the unlicensed frequency band.
  • the information indicates that the terminal device does not send uplink information in the time window.
  • the processing unit 802 may further determine, according to multiple manners, whether the terminal device is allowed to send uplink information in the time window. For details, refer to the description of the method embodiment corresponding to FIG. 3 .
  • the network device in the embodiment of the present invention may be used to perform the method in the foregoing method embodiment corresponding to FIG. 3, the determining of the downlink control information sending time unit, the sending of the downlink control information, and whether the terminal device can be in the network device.
  • a specific implementation manner such as an indication that the corresponding time window sends the uplink information, refer to the description in the method embodiment.
  • the specific functions of the transmitting unit 801, the processing unit 802, and the receiving unit 803 included in the network device respectively correspond to the functions in the embodiment corresponding to FIG. 3 described above; the terms and implementation details therein are similar to those in the method embodiment.
  • the functional unit of the network device in this embodiment may be implemented by corresponding hardware, or may be implemented by corresponding hardware, for example, the foregoing sending unit 801 may be executed.
  • the hardware of the foregoing transmitting module function such as a transmitter, may also be a general processor or other hardware device capable of executing a corresponding computer program to perform the foregoing functions; and the processing unit 802 as described above may be a hardware having a function of executing a processing module.
  • the foregoing receiving unit 803 may be hardware having a function of executing the foregoing receiving module, such as a receiver, or a general processor or other hardware device capable of executing a corresponding computer program to perform the foregoing functions.
  • the time unit may be one radio frame, one subframe, one time slot, or one symbol, or may be multiple radio frames, multiple subframes, multiple The time slot or multiple symbols can be flexibly designed according to the needs of the actual communication system.
  • the time unit may be one subframe.
  • the time window may include one or more time units, and the terminal device transmits the uplink information on one of one or more time units included in the time window. For example, when the time window includes a time unit, the terminal device transmits the uplink information in the one time unit.
  • the terminal device determines a time unit within the time window, and sends the uplink information on the determined one time unit; wherein the terminal information
  • the device determines a time unit in the time window in a manner determined by channel monitoring. In this manner, a time unit in the time window determines that the terminal device is preempted in the time window.
  • the first time unit after the licensed band resource.
  • the length of each time unit in the set of candidate time units and the length of each time unit in the time window may be the same or different.
  • the network device sends the downlink control information in the first time unit, and may include a time used by the network device to transmit downlink control information in the first time unit.
  • the downlink control information is sent in a range.
  • the time length corresponding to the time range for transmitting the downlink control information by the first time unit may be 1 ms or less than 1 ms.
  • an embodiment means that a particular feature, structure or characteristic relating to an embodiment is included in at least one embodiment of the invention.
  • “in one embodiment” occurs throughout the specification, "in an embodiment The same may be used in the embodiment of the invention, and the specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
  • the processor in the embodiment of the present invention may be a central processing unit (CPU), a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device. , transistor logic, hardware components, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like.
  • the functions of the transmitter, the receiver, and the processor are not limited to the execution function of the communication method flow provided by the embodiment of the present invention, and may also be used to cooperate with the terminal device or The execution of other functions of the network device, such as basic communication functions, execution of various applications, etc., will not be described here.
  • B corresponding to A or “B corresponding to A” means that B is associated with A, and B can be determined according to A.
  • determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.
  • the steps of the method described in connection with the present disclosure may be implemented in a hardware manner, or may be implemented by a processor executing software instructions.
  • the software instructions may be comprised of corresponding software modules that may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable hard disk, CD-ROM, or any other form of storage well known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. of course, The storage medium can also be an integral part of the processor.
  • the processor and the storage medium may be located in an application specific integrated circuit (ASIC). Additionally, the ASIC can be located in a terminal device or a network device.
  • the processor and the storage medium may also exist as discrete components in the terminal device or the network device.
  • each network element such as a UE, a base station, a core network entity, etc.
  • each network element such as a UE, a base station, a core network entity, etc.
  • each network element such as a UE, a base station, a core network entity, etc.
  • each network element includes corresponding hardware structures and/or software modules for performing various functions.
  • the present invention can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.
  • An integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, can be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or an optical disk, and the like.
  • the medium of the program code includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or an optical disk, and the like.

Abstract

本发明实施例提供了一种免授权频段上的通信方法，包括：终端设备接收网络设备发送的下行控制信息，所述下行控制信息位于候选时间单元集合中的第一时间单元内，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复；所述终端设备根据所述下行控制信息的发送时间确定发送上行信息的时间窗；所述终端设备在所述时间窗内发送所述上行信息；其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元。该方法提供了合理的资源配置方式，提高了免授权频段上的数据传输效率。

Description

免授权频段上的通信方法、终端设备以及网络设备 技术领域
本发明涉及无线通信领域，尤其涉及一种免授权频段上的资源分配方法，以及终端设备和网络侧设备。
背景技术
目前，授权频段资源受限，为了进一步提升容量，运营商可以通过免授权频段为用户设备提供数据服务。免授权频段上使用的主要技术是无线保真(Wireless Fidelity，简称Wi-Fi)，但是使用Wi-Fi技术的无线局域网(Wireless Local Network,简称WLAN)接入点(Access Point，简称AP)在移动性、安全性、服务质量(Quality of Service，简称QoS)、以及同时处理多用户调度方面存在缺陷。因此，将长期演进(Long-term Evolution，简称LTE)技术应用于免授权频段，不仅可以有效利用免授权频段资源，还可以提供更优的无线接入、满足日益增长的移动宽带服务的需求。
LTE系统中，免授权频段资源上的数据发送或接收可以通过以载波聚合(Carrier Aggregation，CA)为基础的授权辅助接入LAA-LTE(LAA-LTE，Licensed-Assisted Access Using LTE)系统实现。目前，LAA-LTE考虑使用的免授权频段是各国政府开放的5GHz的免授权频段。无线通信系统在占用免授权频段通信时需使用先检测后发送(Listen Before Talk，简称LBT)规则。一般而言，通信设备(包括基站等网络设备和/或终端设备)在使用免授权频段进行数据传输之前，都需要先进行侦听，这就使得所述通信设备在免授权频段资源上的数据发送或接收是机会性的。
网络设备工作在免授权频段时，首先需要进行空闲信道检测，当所述空闲信道检测成功，所述网络设备获取免授权频段上的一段时间资源，按照一定的资源配置方式(例如，预先配置的帧结构)开始进行数据传输。但是， 免授权频段上间隔设置有为上行信息预留的传输信道，当所述上行信息的预留位置正好出现在所述网络设备发送下行用户数据的时间范围内，则所述下行用户数据的传输被中断，以便于将所述免授权频段上的资源留给所述上行信息传输，导致所述网络设备的下行用户数据传输被破坏，同时降低了免授权频段上的数据传输效率。
因此，需要提供一种免授权频段上的通信技术，提高免许可频段资源上的数据传输效率。
发明内容
本发明实施例提出了一种免授权频段上的通信技术，其目的在于合理配置免授权频段资源，提高免授权频段上的数据传输效率。
为达到上述目的，本发明的实施例采用如下技术方案：
第一方面，提供了一种免授权频段上的通信方法，包括：
终端设备接收网络设备发送的下行控制信息，所述下行控制信息位于候选时间单元集合中的第一时间单元内，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复；
所述终端设备根据所述下行控制信息的发送时间确定发送上行信息的时间窗；
所述终端设备在所述时间窗内发送所述上行信息；
其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元。
在一个可能的设计中，所述下行控制信息的结束时刻为T2，所述终端设备在所述T1与T2之间的时间间隔内不进行下行用户数据接收。
在一个可能的设计中，所述终端设备在所述时间窗内发送所述上行信息包括：进行空闲信道检测CCA；和在所述CCA检测成功后，发送所述上行信 息。
在一个可能的设计中，所述终端设备接收指示信息，所述指示信息用于指示所述终端设备是否具有所述时间窗或指示所述终端设备是否允许在所述时间窗内发送所述上行信息。
在一个可能的设计中，当第一时间单元内具有网络设备发送的下行用户数据时，所述指示信息指示不具有所述时间窗或不允许在所述时间窗内发送所述上行信息。
第二方面，提供了一种免授权频段上的通信方法，包括：
网络设备在第一时间单元内发送下行控制信息，所述第一时间单元包含在一候选时间单元集合中，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复；
所述网络设备根据所述下行控制信息的发送时间接收上行信息，所述上行信息位于一时间窗中；
其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元。
在一个可能的设计中，所述下行控制信息的结束时刻为T2，所述网络设备在所述T1与T2之间的时间间隔内不发送下行用户数据。
在一个可能的设计中，所述网络设备还发送指示信息，所述指示信息用于指示终端设备是否具有所述时间窗或指示是否允许终端设备在所述时间窗内发送所述上行信息。
在一个可能的设计中，当所述网络设备在所述第一时间单元内发送下行用户数据时，所述指示信息指示所述终端设备不具有所述时间窗或不允许在所述时间窗内发送所述上行信息。
第三方面，提供了一种终端设备，包括：
接收单元，用于接收网络设备发送的下行控制信息，所述下行控制信息 位于候选时间单元集合中的第一时间单元内，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复；
处理单元，用于根据所述下行控制信息的发送时间确定发送上行信息的时间窗；
发送单元，用于在所述时间窗内发送所述上行信息；
其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元。
在一个可能的设计中，所述下行控制信息的结束时刻为T2；所述接收单元不在所述T1与T2之间的时间间隔内接收下行用户数据。
在一个可能的设计中，所述发送单元在所述时间窗内发送所述上行信息包括，进行空闲信道检测CCA，和在所述CCA检测成功后，发送所述上行信息。
在一个可能的设计中，所述接收单元还接收指示信息，所述指示信息用于指示所述终端设备是否具有所述时间窗或指示所述终端设备是否允许在所述时间窗内发送所述上行信息。
在一个可能的设计中，当第一时间单元内具有网络设备发送的下行用户数据时，所述指示信息指示不具有所述时间窗或不允许在所述时间窗内发送所述上行信息。
在一个可能的设计中，该方面中终端设备的功能单元可以是由相应的硬件实现，也可以由相应的硬件执行相应的软件完成。
第四方面，提供了一种网络设备，包括：
发送单元，用于在第一时间单元内发送下行控制信息，所述第一时间单元包含在一候选时间单元集合中，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复；
接收单元，用于根据所述下行控制信息的发送时间接收上行信息，所述上行信息位于一时间窗中；
其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元。
在一个可能的设计中，其中，所述下行控制信息的结束时刻为T2；所述发送单元不在所述T1与T2之间的时间间隔内发送下行用户数据。
在一个可能的设计中，所述发送单元还用于发送指示信息，所述指示信息用于指示终端设备是否具有所述时间窗或指示是否允许终端设备在所述时间窗内发送所述上行信息。
在一个可能的设计中，当所述发送单元在所述第一时间单元内发送下行用户数据时，所述指示信息指示所述终端设备不具有所述时间窗或不允许在所述时间窗内发送所述上行信息。
在一个可能的设计中，该方面中终端设备的功能单元可以是由相应的硬件实现，也可以由相应的硬件执行相应的软件完成。
针对上述各个方面，本发明实施例中还可以包括如下可能的设计。
在一个可能的设计中，所述时间窗的起始时刻T1为所述第二时间单元的起始时刻；或者所述下行控制信息的结束时刻T2为所述第一时间单元内的第n个OFDM符号，所述时间窗的起始时刻T1为所述第一时间单元内的第n+2个OFDM符号。例如，所述T2为所述第一时间单元内的第n个OFDM符号的结束时刻，则所述T1为所述第一时间单元内的第n+2个OFDM符号的起始时刻。
在一个可能的设计中，所述下行控制信息的结束时刻为T2，其中，所述T1与T2之间的时间间隔T为收发转换时间。
在一个可能的设计中，所述下行控制信息包括发现参考信号DRS和/或公共控制信息。
在一个可能的设计中，所述上行信息包含随机接入过程中的上行信息、 上行传输调度请求SR、探测参考信号SRS和周期信道状态信息P-CSI中的一个或多个。
在一个可能的设计中，所述时间单元为子帧。
在一个可能的设计中，所述候选时间单元集合可以包含一个时间单元，也可以包含多个时间单元。
由上可以看出，本发明实施例中提供的方案，缩短了终端设备结束下行控制信息的接收的时刻与用于发送上行信息的时间窗的起始时刻的时间间隔。这种方式减少了免授权频段上下行用户数据传输的影响，提高了免授权频段上的数据传输效率。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的免授权频段通信的应用场景示意图；
图2是现有的免授权频段上的一种资源分配示意图；
图3是本发明实施例提供的一种免授权频段上的通信方法流程示意图；
图4是本发明实施例提供的一种DRS信号的结构示意图；
图5-1是本发明实施例提供的免授权频段上的一种可能的资源分配示意图；
图5-2是本发明实施例提供的免授权频段上的另一种可能的资源分配示意图；
图5-3是本发明实施例提供的免授权频段上的又一种可能的资源分配示意图；
图6-1是本发明实施例提供的免授权频段上一候选时间单元集合上一种 可能的资源分配示意图；
图6-2是本发明实施例提供的免授权频段上一候选时间单元集合上另一种可能的资源分配示意图；
图7为本发明实施例提供的一种终端设备的一种可能的结构示意图；
图8为本发明实施例提供的一种网络设备的一种可能的结构示意图；
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行描述。需要说明的是，在不冲突的情况下，本发明实施例之间以及实施例中的特征可以相互结合。
本发明的方案应用于无线通信系统，尤其是使用免授权频段通信的LTE系统，例如授权频段辅助接入LAA的LTE系统(简称LAA-LTE)、基于双连接(Dual Connectivity，简称DC)的LTE系统以及免授权频段独立LTE(standalone LTE over unlicensed spectrum，简称Standalone LTE-U)系统。以LAA-LTE系统为例，具体场景参见图1所示。利用载波聚合(Carrier Aggregation，简称CA)技术，LTE设备可以实现以授权频段上的载波为主成员载波(Primary Component Carrier，简称PCC)，免授权频段上的载波为辅成员载波(Secondary Component Carrier，简称SCC)或辅小区(Secondary Cell，简称SCell)。这样LTE设备可以通过授权频段上的载波继承用于无线通信的传统优势，又可以通过免授权频段上的载波实现分流，减小授权频段上的载波的负载。当LAA-LTE系统使用免授权频段资源时，需要遵从免授权频段的使用规范。具体的网络架构中，将授权频段或授权频段包括的载波或工作在授权频段上的小区作为主小区，将免授权频段或免授权频段包括的载波或工作在免授权频段上的小区作为辅小区，其中主小区和辅小区可以共站部署，也可以是非共站部署，两个小区之间有理想的回传路径。
此外，网络架构中还可以包含独立部署地工作在免授权频段上的小区， 即此时工作在免授权频段上的小区直接可以提供独立接入功能，不需要通过工作在授权频段上小区的辅助，例如Standalone LTE-U系统。本发明实施例不限于上述网络架构，还可以包括其他可以实现本发明实施例提供的解决方案的网络架构。
本发明中所涉及的网络设备为所有除终端设备外的网络端网元，可以是基站，或小区，或者接入点，或者核心网，或者接入网网元。基站可用于将收到的空中帧与IP分组进行相互转换，作为无线终端与接入网的其余部分之间的路由器，其中接入网的其余部分可包括网际协议(IP)网络。基站还可协调对空中接口的属性管理。例如，基站可以是全球移动通信(Global System for Mobile communications，简称GSM)系统或码分多址(Code Division Multiple Access，简称CDMA)系统中的基站，也可以是宽带码分多址(Wideband Code Division Multiple Access Wireless，简称WCDMA)系统中的基站(NodeB)，还可以是LTE中的演进型基站(evolutional Node B，简称eNB或e-NodeB)。所述小区可以是基站对应的小区，小区可以属于宏基站，也可以属于小小区(small cell)对应的基站，这里的小小区可以包括：城市小区(Metro cell)、微小区(Micro cell)、微微小区(Pico cell)、毫微微小区(Femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。本发明实施例不限于上述网络设备，还可以包括其他可以实现本发明实施例提供的解决方案的网络设备。
本发明中所涉及的终端设备可以是指向用户提供语音和/或数据连通性的设备，具有无线连接功能的手持式设备、或连接到无线调制解调器的其他处理设备。其中无线的设备或单元可以是移动终端，如移动电话(或称为“蜂窝”电话)和具有移动终端的计算机，例如，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。例如，个人通信业务(Personal Communication Service，简称PCS)电话、无绳电话、会话发起协议(SIP)话机、无线本地环路(Wireless Local  Loop，简称WLL)站、个人数字助理(Personal Digital Assistant，简称PDA)等设备。无线终端也可以称为系统、订户单元(Subscriber Unit)、订户站(Subscriber Station)，移动站(Mobile Station)、移动台(Mobile)、远程站(Remote Station)、接入点(Access Point)、远程终端(Remote Terminal)、接入终端(Access Terminal)、用户终端(User Terminal)、用户代理(User Agent)、用户设备(User Device)、或用户装备(User Equipment)。终端设备还可以包括中继Relay，和基站可以进行数据通信的都可以看为终端设备。优选地，本发明中的终端设备还可以为非无线资源链接态的终端设备。本发明实施例中不做具体限定。
对于使用免授权频段的LTE系统而言，在应用免授权频段进行通信时，最有可能与其竞争资源的通信设备属于无线保真(Wireless Fidelity，简称Wi-Fi)通信系统。Wi-Fi通信系统应用的一种竞争资源的方法也是先听后说(Listen Before Talk，简称LBT)规则。LBT的基本思想为：每个通信设备(网络设备和/或终端设备)在某个信道上发送数据之前，需要先检测当前信道是否空闲，即是否可以检测到附近节点正在占用所述信道发送数据，这一检测过程被称为空闲信道检测(Clear Channel Assessment，简称CCA)；如果在一段时间内检测到信道空闲，那么该通信设备就可以发送数据，并且一般而言，在该信道上发送数据的时间是有限制的，在此限制的时间范围内，该通信设备不需要对该信道进行空闲检测；如果检测到信道被占用，那么该通信设备当前就无法在该信道上传输数据。
上述过程中，通信设备可以通过信号检测、能量检测等方式检测信道是否空闲。例如，如果通过信号检测的方式，若没有检测到特定的信号(例如针对Wi-Fi系统，该信号可以是前导信号)，则可以认为信道空闲；此时，通信设备可以利用免授权频段进行数据传输。又如，如果采用能量检测的方式，若接收到或检测到的能量低于某个门限值，则可以认为信道空闲，通信设备可以利用免授权频段进行数据传输。
为了更有效地利用免授权频段资源，免授权频段上数据传输并不应用固定的帧结构。网络设备例如基站或小区可以根据下行业务负载和/或上行业务负载，或者其他考虑因素，决定在抢占到免授权频段资源之后，下行用户数据传输时长和/或上行数据的传输时长，并可以根据业务需求调整在该免授权频段资源上的上下行传输方式，进而提升免授权频段上的资源使用效率。进一步地，免授权频段资源的使用受最大信道占用时长(Maximum Channel Occupancy Time，简称MCOT)的约束，那么一次连续地下行用户数据传输时长不能大于MCOT、一次连续地上行数据传输时长不能大于MCOT、或者一次连续地下行用户数据传输和一次连续地上行数据传输时长的时长之和不能大于MCOT。这里，MCOT是指网络设备或终端设备在抢占到免授权频段资源之后，可以在给该抢占到的免许可频段资源上进行数据传输而不需要再评估免许可频段资源可用性的最大时间长度。每个传输机会(Transmission Opportunity，简称TxOP)内包括的下行突发数据传输和/或上行突发数据传输组成的部分可以理解为一种帧结构。不同TxOP内包括的帧结构可以不同，所述TxOP内的传输时长不大于MCOT。
免授权频段资源上间隔设置预留的传输信道，所述预留的传输信道用于通信设备传输信息。所述间隔可以是周期性的间隔或非周期性的间隔，具体的间隔时间根据传输的信息类型确定。所述预留的传输信道可以为物理随机接入信道(Physical Random Access Channel，简称PRACH)，该信道资源在时间上是周期性配置的；或者，可以为用于传输调度请求(Scheduling Request，简称SR)的上行资源，该上行资源在时间上也是周期配置的；或者，可以为用于传输探测参考信号(Sounding Reference Signal，简称SRS)的上行资源，该上行资源在时间上也是周期配置的；或者，可以为用于传输混合自动重传请求确认(Hybrid Automatic Repeat Request，Acknowledgment，简称HARQ-ACK)的上行资源，其中HARQ-ACK至少包括确认应答(Acknowledgment，简称ACK)、否认应答(Negative Acknowledgement， 简称NACK)，该传输HARQ-ACK的上行资源在时间上也是周期配置的；或者，可以为用于传输信道状态信息(Channel State Information，简称CSI)的上行资源，该上行资源在时间上也是周期配置的；或者，可以为物理上行控制信道(Physical Uplink Control Channel，简称PUCCH)，该信道资源在时间上是周期性配置的。
以预留的传输信道为PRACH为例，网络设备(例如基站或小区等)需要通过免授权频段资源进行数据传输，经过空闲信道检测，所述网络设备竞争得到免授权频段上的一段资源，最大时长为MCOT。所述网络设备在竞争得到上述免授权频段资源后，根据配置的帧结构进行下行用户数据传输，该配置的帧结构可以根据下行业务需求确定。若免授权频段上，PRACH的预留位置正好出现在所述网络设备竞争得到的上述资源中，尽管所述网络设备在竞争得到免授权频段上的所述资源之后，还没有达到MCOT约束的时间长度，也必须要中断下行用户数据的传输，以将免授权频段上预留的资源用于PRACH的传输。在PRACH传输结束之后，所述网络设备还需要重新进行空闲信道检测以确定免授权频段上的资源是否可用，以决定是否可以继续被中断的所述下行用户数据的传输。这种情况下，所述网络设备的下行数据传输被破坏，免授权频段上的数据传输效率受到影响。另外，在PRACH传输之前，终端设备有可能也需要进行空闲信道检测以判断免授权频段资源是否可用；例如，如果预留的上行资源在下行用户数据传输对应的MCOT上，那么终端设备在预留的上行资源上传输数据可以不评估免许可频段资源的可用性；反之，如果预留的上行资源超过下行用户数据传输对应的MCOT，则终端设备在预留的上行资源上传输数据需要评估免许可频段资源的可用性。这种情况进一步降低了免授权频段上的数据传输效率。
图2给出了一种示例，网络设备经过CCA确定在子帧n可以进行数据传输，则该网络设备从子帧n的子帧起始边界开始进行下行用户数据传输，在子帧n+m的子帧结束边界结束数据传输(m等于5)。进一步地，从子帧n的子帧起 始边界到子帧n+m的子帧结束边界之间的时间长度不大于MCOT。但如果从子帧n的子帧起始边界到子帧n+m的子帧结束边界之间的时间内，PRACH资源位于子帧n+k内，其中k大于0且k小于m，则该接入网设备只能从子帧n的子帧起始边界开始传输下行用户数据，到子帧n+k-1(k＝3)的子帧结束边界结束。之后，所述网络设备需要重新进行CCA，以确定是否可以继续发送所述下行用户数据。另外，视所述下行用户数据的结束时刻与上行资源起始时刻之间的时间间隔而定，所述终端设备在发送上行信息之前可能也需要进行空闲信道的检测，降低了免授权频段上的数据传输效率。
因此，本发明实施例提供了一种免授权频段上的通信技术，通过在免授权频段合理配置数据传输位置，减少对免授权频段的帧结构设计的影响，提高免授权频段上的数据传输效率。
需要说明的是，本发明各实施例中，下行控制信息可以为发现参考信号(Discovery Reference Signal，简称DRS)，或者为公共控制信息(例如公共控制信道承载的下行控制信息)，或者适用于本发明实施例的其它类型的下行控制信息。其中，所述DRS包括小区特定参考信号(Cell-specific Reference Signal，简称CRS)，辅同步信号(Secondary Synchronization Signal，简称SSS)，主同步信号(Primary Synchronization Signal，简称PSS)以及可配置的信道状态信息参考信号(Channel State Information Reference Signal，简称CSI-RS)中的一个或多个。所述公共控制信息包括系统信息块类型1(System Information Block Type 1,简称SIB1)中承载的全部或部分信息，也可以是物理广播信道(Physical Broadcast Channel，简称PBCH)承载的全部或部分信息，还可以是其他系统消息块类型(System Information Block Type，简称SIB)承载的全部或部分信息。
需要说明的是，本发明各实施例中，所述上行信息可以为以下信息中的至少一个：物理随机接入信道(Physical Random Access Channel,PRACH)包括的全部或部分上行信息、探测参考信号(Sounding Reference Signal， 简称SRS)传输调度请求(Scheduling Request，简称SR)、周期信道状态信息(Channel State Information，简称CSI)等，或者适用于本发明实施例的其它类型的上行信息。
图3示出了本发明实施例提供的一种免授权频段上的通信方法流程图，具体包括：
S301：网络设备在第一时间单元内发送下行控制信息，所述第一时间单元包含在一候选时间单元集合中，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复。
相应的，终端设备接收所述网络设备发送的所述下行控制信息。
具体而言，所述非授权频段在时域上可以被划分为多个连续的时间单元，所述时间单元可以为子帧。所述候选时间单元集合例如可以包含6个候选时间单元，在每40个连续的时间单元中出现一个所述候选单元集合。所述网络设备在所述候选单元集合所包括的6个时间单元中依次进行CCA，并在CCA成功后发送所述下行控制信号。实际发送所述下行控制信号的时间单元即为第一时间单元。如果所述网络设备在一个所述候选单元集合中的6个时间单元都未能获得发送下行控制信号的机会(例如未能CCA成功)，那么需要在下一个候选时间单元集合内尝试发送所述下行控制信号。
S302：所述终端设备根据所述下行控制信息的发送时间确定发送上行信息的时间窗。
S303：所述终端设备在所述时间窗内发送所述上行信息。
S304：所述网络设备根据所述下行控制信息的发送时间接收所述上行信息。
其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元，所述下行控制信息的结束时刻为T2。
下面以所述下行控制信息为DRS信号为例，详细说明步骤S302-S304。本领域技术人员可知，以下实施例仅以DRS信号为例进行解释说明，但是本发明的保护范围不限于所述下行控制信息为DRS的情况，还包括本发明其他部分提到的满足本发明实施例要求的任何类型的下行控制信息的方式。
DRS的具体结构如图4所示，其中DRS区域在时间上包括12个OFDM符号，但不是每个OFDM符号上都有有效数据。以一个物理资源块(Physical Resource Block，简称PRB)对为例，所述PRB在时间上是1ms，在频率上包括12个子载波，一个资源元素(Resource Element，简称RE)在时间上是1个OFDM符号，在频率上是一个子载波(Subcarrier)。
本发明一可选的实施例中，终端设备在T2时刻结束接收所述下行控制信息，所述终端设备发送所述上行信息的时间窗的起始时刻为T1，所述T1和T2之间存在时间间隔。所述T1时刻的位置可通过多种可选的实现方式进行设置，具体如下：
一种实现方式中，设置所述T1时刻的位置，使得所述终端设备在T1和T2之间的所述时间间隔内不接收下行用户数据。例如，所述网络设备在该段时间间隔内不发送下行用户数据，或者所述终端设备不在该段时间间隔内接收下行用户数据，则所述网络设备未发送下行用户数据。又如，设置T1和T2之间的所述时间间隔不足以进行一次下行用户数据传输调度，这样可以避免时间间隔大到允许新的下行用户数据传输的情况下，新的下行用户数据开始传输。该实现方式可以保证所述终端设备接收所述下行控制信息之后、发送所述上行信息之前，不会出现其他的下行用户数据传输，进而避免了该段时间间隔内所述网络设备进行的下行用户数据传输被中断或中止，提高了免授权频段上的数据传输效率。
又一种实现方式中，所述T1时刻为所述第二时间单元的起始时刻，或者，所述T2为所述第一时间单元内的第n个OFDM符号，所述T1为所述第一时间单元内的第n+2个OFDM符号。例如，所述T2为所述第一时间单元内的第n个OFDM 符号的结束时刻，则所述T1为所述第一时间单元内的第n+2个OFDM符号的起始时刻。
具体参见图5-1和图5-2，所述网络设备在子帧n上发送DRS，所述终端设备在子帧n检测或接收到所述DRS，并在T2时刻结束对所述DRS的接收,则将子帧n+1的起始时刻或者子帧n的第14个符号的起始时刻作为所述时间窗的起始时刻T1。该实现方式既考虑了所述下行控制信息传输可能出现的时延，又可以保证用于所述上行信息的发送的时间窗的起始时刻T1从完整的时间边界开始。
再一种实现方式中，所述T1为所述T2时刻之后，仅经过收发转换时间之后的时刻。其中，对于网络设备而言，所述收发转换时间包括网络设备从结束下行用户数据发送到开始上行数据接收之间的转换时间；对于终端设备而言，包括终端设备从结束下行用户数据接收到开始上行数据发送之间的转换时间。例如，对于网络设备而言，收发转换时间可以不大于17微秒；对于终端设备而言，收发转换时间可以不大于20微秒。
以所述上行信息为PRACH为例，具体参见图5-3。所述网络设备在子帧n上发送DRS，DRS区域在时间上包括12个OFDM符号，所述终端设备在子帧n检测或接收到所述DRS，并在所述时刻T2结束接收所述DRS。所述时刻T2经过收发转换时间之后的所述时刻T1，即在所述子帧n包括的第13个OFDM符号开始经历一个收发转换时间之后的时刻，为所述终端设备发送所述上行信息的时间窗的起始时刻。通过该实现方式，所述终端设备可以在接收到DRS之后，经过收发转换的时间便发送所述上行信息，无需进行任何等待，避免了信道被其他通信设备抢占，同时提高了免授权频段的传输效率。
本发明又一可选的实施例中，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合可以包含一个时间单元，也可以包含多个时间单元。
例如，当所述候选时间单元集合包含一个时间单元时，所述网络设备在 所述一个时间单元内发送所述下行控制信息，所述终端设备在所述一个时间单元内检测并接收所述下行控制信息。
又如，当所述候选时间单元集合包含多个时间单元时，所述网络设备在所述多个时间单元中的一个时间单元上发送所述下行控制信息，所述终端设备检测并接收所述下行控制信息。
例如，当所述下行控制信息为DRS时，周期性出现的DRS测量时间配置(Discovery Management Time Configuration，简称DMTC)对应的时间窗内可以用于发送所述DRS。网络设备经过CCA确定DRS的发送位置并发送所述DRS。其中所述DMTC可以是一个长达6ms的时间段，即6个子帧，或者所述DMTC是一个可以配置长度的时间段，例如是一个从1ms-10ms的时间段，即1个-10个子帧，每个子帧均可以用于发送所述DRS，所述用于DRS的可发送位置占用每个子帧的12个符号。
进一步地，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复，即在所述多个连续的时间单元上周期性配置所述候选时间单元集合。这种实现方式下，虽然用于所述终端设备接收所述下行控制信息的时间单元在所述候选时间单元集合中的位置并非固定的，但是可以实现在每个候选时间单元集合所在的周期内使得所述终端设备可以接收所述下行控制信息，同时可以实现每个所述周期内所述终端设备可以发送所述上行信息。
本发明又一可选的实施例中，所述终端设备根据所述下行控制信息确定发送上行信息的时间窗，并在所述时间窗内发送所述上行信息。在发送所述上行信息之前，所述终端设备可以进行空闲信道检测CCA，或者不进行空闲信道检测CCA，具体的实现方式可以如下：
一种实现方式中，所述终端设备结束接收所述下行控制信息的时刻T2与用于发送所述上行信息的时间窗的起始时刻T1之间的时间间隔足够短，不足以被其他通信设备竞争或抢占。因此，所述终端设备发送所述上行信息之前不需要执行CCA操作。
另一种实现方式中，所述终端设备在发送所述上行信息之前进行CCA，但是进行CCA时间可以在所述时间窗之内，也可以在时间窗之外。
例如，所述终端设备结束接收所述下行控制信息之后，在所述时间窗开始之前完成所述CCA操作，即所述CCA操作不占用所述时间窗内的时间。
又如，所述终端设备在所述时间窗内进行CCA检测，所述CCA检测成功后，所述终端设备发送所述上行信息。当所述时间窗包含多个时间单元时，所述终端设备可以在每个时间单元的起始时刻之前或起始时刻进行CCA检测，直到CCA检测成功，确定所述时间窗中的一个时间单元空闲，则所述终端设备开始发送所述上行信息。
需要说明的是，在该实现方式中，视是否包括随机回退的侦听机制的不同情况，CCA检测的时间可以不同，这里不做具体限定。
本发明又一可选的实施例中，所述终端设备在所述时间窗内发送所述上行信息，所述时间窗的起始时刻T1可以通过多种方式进行配置：
例如，通过标准协议规范所述时刻T1。所述终端设备根据所述标准协议的规定，利用所述起始时刻为T1的时间窗发送上行信息。
又如，通过信令配置所述时刻T1，所述信令可以是无线资源控制(Radio Resource Control，简称RRC)信令，也可以是媒体介入控制(Medium Access Control，简称MAC)信令，也可以是物理层信令。进一步地，所述信令可以是RRC信令中的广播信令，还可以是物理层公共控制信令，还可以是RRC信令中的群组广播信令，即只对系统中的部分终端设备有效，还可以是物理层群组公共控制信息，即也只对系统中的部分终端设备有效。
再如，所述时间窗的起始时刻T1也可以由网络设备通过公共控制信道通知终端设备，所述公共控制信道可以与所述下行控制信息在相同的时间单元中发送，例如第一时间单元，或者在其他预先配置或可用的时间单元内。可选地，承载该公共控制信道的时间单元也可以是周期性分布的。
本发明又一可选的实施例中，所述终端设备在所述时间窗内发送上行信 息，所述时间窗中用于发送所述上行信息的时间长度可以为固定长度，也可以根据需要进行配置。例如，所述发送所述上行信息的时间长度可以为：一个OFDM符号、一个子帧、一个时隙(0.5毫秒)，或者其他整数个OFDM符号。又如，用于发送所述上行信息的时间资源的长度可以预先配置，或者通过信令通知的。具体的，通过标准协议直接定义所述时间长度；或者通过信令配置所述时间长度，所述信令可以是RRC信令、MAC信令或物理层信令(例如，物理层公共控制信令)。
本发明又一可选的实施例中，网络设备还发送指示信息，终端设备接收所述指示信息，并根据所述指示信息确定是否在所述时间窗发送上行信息。所述指示信息可以用于指示该终端设备是否具有所述时间窗，或者是否允许所述终端设备在所述时间窗发送上行信息。所述指示信息可以有如下多种实现方式：
一种实现方式中，所述终端设备根据所述指示信息的有无，确定是否具有所述时间窗，或者是否可以在所述时间窗发送上行信息。例如，如果终端设备未检测到所述指示信息，则表明所述终端设备具有所述时间窗，或者所述终端设备可以在所述时间窗发送上行信息，则所述终端设备在所述时间窗发送上行信息；又如，如果终端设备检测到所述指示信息，则表明所述终端设备具有所述时间窗，或者所述终端设备可以在所述时间窗发送上行信息，则所述终端设备在所述时间窗发送上行信息；再如，如果终端设备检测到所述指示信息，则表明所述终端设备不具有所述时间窗，或者所述不允许终端设备在所述时间窗发送上行信息，则所述终端设备不在所述时间窗发送上行信息；最后，如果终端设备未检测到所述指示信息，则表明所述终端设备不具有所述时间窗，或者不允许所述终端设备在所述时间窗发送上行信息，则所述终端设备不在所述时间窗发送上行信息。
又一种实现方式中，所述指示信息通知指示终端设备是否具有所述时间窗，或者是否允许所述终端设备在所述时间窗发送上行信息。例如，如果所 述指示信息指示所述终端设备具有所述时间窗，或者允许所述终端设备在所述时间窗发送上行信息，则所述终端设备在所述时间窗发送上行信息。又如，如果所述指示信息指示所述终端设备不具有所述时间窗，或者不允许所述终端设备在所述时间窗发送上行信息，则所述终端设备不在所述时间窗发送上行信息。在该实现方式中，所述终端设备可以直接根据所述指示信息指示的内容，确定是否在所述时间窗上发送上行信息。
在上述实现方式中，可选的，所述指示信息可以为公共控制信息。通过公共控制信息向终端设备发送指示信息可以节约信令的开销。进一步可选地，所述公共控制信息还可以用于指示包括该指示信息在内的下行数据突发的结束位置。下行数据突发可以理解为，网络设备在抢占到免许可频段资源之后，在免许可频段资源上连续传输的下行数据的时间长度。通过该方式，可以复用现有信令设计，不需要引入额外的设计方式，降低了通信系统设计的复杂度。
需要说明的是，免授权频段资源上的每个候选时间单元集合中，网络设备可以所只发送所述下行控制信息(如图6-1所示)，或者，发送所述下行控制信息和所述指示信息，或者，除所述下行控制信息，或者所述下行控制信息和所述指示信息之外，还发送下行用户数据。如图6-2所示(其中第一时间单元用子帧5表示)，所述下行用户数据包括承载在物理下行共享信道(Physical Downlink Shared Channel，简称PDSCH)中的数据但非广播数据，也可以包括承载在物理下行控制信道(Physical Downlink Control Channel，简称PDCCH)中的数据，还可以包括承载在增强物理下行控制信道(Enhanced Physical Downlink Control Channel，简称E-PDCCH)中的数据，还可以包括承载在物理广播信道(Physical Multicast Channel，简称PMCH)中的数据。所述下行用户数据还可以包括下行参考信号，所述下行参考信号包括以下至少一项：小区特定参考信号(Cell-specific Reference Signal，简称CRS)，多媒体广播多播服务单频网络参考信号(Multimedia  Broadcast Multicast Service Single Frequency Network Reference Signal，简称MBSFN RS)，用于解调PDSCH承载数据的用户设备特定参考信号(UE-specific Reference Signal，简称DM-RS)，用于解调EPDCCH或MPDCCH承载数据的参考信号(DeModulation Reference Signal，简称DM-RS)，定位参考信号(Positioning Reference Signal，简称PRS)，信道状态信息参考信号(CSI Reference Signal，简称CSI-RS)。
可选的，当所述候选时间单元集合中包括所述下行用户数据时，为了不影响免授权频段上的帧结构设计，所述网络设备可以通过上述指示信息指示所述终端设备不在所述时间窗发送上行信息，或者，不在所述时间窗包括的部分时间单元发送上行信息。具体参见以下情况中的实现方式：
一种情况下，当所述网络设备在所述候选时间集合中的第一时间单元中除发送所述下行控制信息之外，还发送下行用户数据。由于用于发送所述上行信息的时间窗的起始时刻有可能位于所述第一时间单元内，则可能出现所述下行用户数据的发送与所述终端设备在所述时间窗内的上行信息的发送产生冲突，导致所述下行用户数据的发送中止或中断，进而影响传输效率。在该情况下，所述网络设备向所述终端设备发送指示信息，指示所述终端设备不在所述时间窗发送上行信息，以避免与所述下行用户数据的传输冲突。
另一种情况下，所述时间窗包括部分时间单元，所述部分时间单元可以是所述网络设备在所述候选时间单元集合中发送下行用户数据的时间单元。所述网络设备发送所述指示信息，通知所述终端设备不在所述时间窗的所述部分时间单元发送上行信息。在这种情况下，终端设备还需要获知所述时间窗包括的所述部分时间单元。例如，终端设备确定所述时间窗的起始时刻，再根据网络设备在所述候选时间单元集合中发送下行用户数据的结束时刻，确定上面描述的所述时间窗包括的部分时间单元。
其他情况下，所述网络设备还可以根据多种方式判断是否允许所述终端设备在所述时间窗发送上行信息。例如，所述网络设备不允许终端设备接入 时、所述网络设备需要在所述下行控制信息发送结束后，开始新的下行控制信息或数据的发送、或者所述网络设备由于其他原因不允许终端设备发送上行信息的情况，这里不做具体限定。
在本发明该实施例中，所述网络设备可以在多个位置发送所述指示信息，例如在所述第一时间单元、或者在第一时间单元之前的时间单元。
本发明再一可选的实施例中，所述网络设备根据所述下行控制信息的发送时间接收所述上行信息，具体可以为，所述网络设备根据所述下行控制信息的发送时间确定所述时间窗，并在所述时间窗内接收所述上行信息。所述终端设备根据所述下行控制信息的发送时间确定所述时间窗的具体实施方式同样适用于所述网络设备，具体可以参见对所述终端设备上述操作的具体描述。
图7为本发明实施例提供的终端设备的一种可能的结构示意图。
终端设备包括检测单元701、接收单元702、处理单元703以及发送单元704，根据实际需要还可以包含存储单元，图中并未示出。
所述检测单元701，用于检测免授权频段上是否有下行控制信息传输。
所述接收单元702，用于在所述检测单元701检测到所述下行控制信息之后，接收所述下行控制信息。
其中，网络设备在候选时间单元集合上的第一时间单元内发送所述下行控制信息，所述终端设备在所述候选时间单元集合上检测到所述下行控制信息，并在所述第一时间单元内接收所述下行控制信息。
具体的，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复。
所述处理单元703，用于根据所述下行控制信息的发送时间确定发送上行信息的时间窗。
所述发送单元704，用于在所述时间窗内发送所述上行信息。
其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单 元内，所述第二时间单元为所述第一时间单元的下一个时间单元，所述下行控制信息的结束时刻为T2。
本发明实施例提供的免授权频段上的通信方法，缩短了下行控制信息的接收和上行信息的发送之间的时间间隔，保持了免授权频段上的帧结构设计，提高了免授权频段上的数据传输效率。
本发明一可选的实施例中，所述检测单元701的功能可以由所述处理单元703实现，或者所述检测单元701集成在所述处理单元703中，即所述终端设备中可以不包含独立的所述检测单元701。
下面以所述下行控制信息为DRS信号为例，阐述本发明实施例提供的终端设备的可能的结构。本领域技术人员可知，以下实施例仅以DRS信号为例进行解释说明，但是本发明的保护范围不限于所述下行控制信息为DRS的情况，还包括本发明其他部分提到的满足本发明实施例要求的任何类型的下行控制信息的方式。
本发明一可选的实施例中，所述接收单元702在T2时刻结束接收所述下行控制信息，所述发送单元704发送所述上行信息的时间窗的起始时刻为T1，所述T1和T2之间存在时间间隔。所述T1时刻的位置可通过多种可选的实现方式进行设置，具体如下：
一种实现方式中，设置所述T1时刻的位置，使得所述终端设备在T1和T2之间的所述时间间隔内不接收下行用户数据。例如，所述网络设备在该段时间间隔内不发送下行用户数据，或者所述终端设备不在该段时间间隔内接收下行用户数据，则所述网络设备未发送下行用户数据。又如，设置T1和T2之间的所述时间间隔不足以进行一次下行用户数据传输调度，这样可以避免时间间隔大到允许新的下行用户数据传输的情况下，新的下行用户数据开始传输。该实现方式可以保证所述终端设备接收所述下行控制信息之后、发送所述上行信息之前，不会出现其他的下行用户数据传输，进而避免了该段时间间隔内所述网络设备进行的下行用户数据传输被中断或中止，提高了免授权 频段上的数据传输效率。
又一种实现方式中，所述T1为所述第二时间单元的起始时刻，或者，所述T2为所述第一时间单元内的第n个OFDM符号，所述T1为所述第一时间单元内的第n+2个OFDM符号。例如，所述T2为所述第一时间单元内的第n个OFDM符号的结束时刻，则所述T1为所述第一时间单元内的第n+2个OFDM符号的起始时刻。
具体的，网络设备在子帧n上发送DRS，所述检测单元701或处理单元703在子帧n检测到所述DRS，所述接收单元702在T2时刻结束对所述DRS的接收,则将子帧n+1的起始时刻或者子帧n的第14个符号的起始时刻作为所述时间窗的起始时刻T1。该实现方式既考虑了所述下行控制信息传输可能出现的时延，又可以保证用于所述上行信息的发送的时间窗的起始时刻T1从完整的时间边界开始。
再一种实现方式中，所述T1为所述T2时刻之后，仅经过收发转换时间之后的时刻。
本发明又一可选的实施例中，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合可以包含一个时间单元，也可以包含多个时间单元。
例如，当所述候选时间单元集合包含一个时间单元时，所述网络设备在所述一个时间单元内发送所述下行控制信息，所述检测单元701或处理单元703在所述一个时间单元内检测到所述下行控制信息，所述接收单元702接收所述下行控制信息。
又如，当所述候选时间单元集合包含多个时间单元时，所述网络设备在所述多个时间单元中的一个时间单元上发送所述下行控制信息，所述检测单元701或处理单元703检测到所述下行控制信息，所述接收单元702接收所述下行控制信息。
进一步地，所述候选时间单元集合在所述多个连续的时间单元上等间隔 重复，即在所述多个连续的时间单元上周期性配置所述候选时间单元集合。
本发明又一可选的实施例中，所述处理单元703根据所述下行控制信息确定发送上行信息的时间窗，并通知所述发送单元704在所述时间窗内发送所述上行信息。在发送所述上行信息之前，所述处理单元703可以进行空闲信道检测CCA，或者不进行空闲信道检测CCA，具体的实现方式可以如下：
一种实现方式中，所述时刻T2与所述T1之间的时间间隔足够短，不足以被其他通信设备竞争或抢占。因此，所述发送单元704发送所述上行信息之前不需要执行CCA操作。
另一种实现方式中，所述处理单元703在所述发送单元704在发送所述上行信息之前进行CCA，但是进行CCA时间可以在所述时间窗之内，也可以在时间窗之外。
例如，所述接收单元702结束接收所述下行控制信息之后，所述处理单元703在所述时间窗开始之前完成所述CCA操作，即所述CCA操作不占用所述时间窗内的时间。
又如，所述处理单元703在所述时间窗内进行CCA检测，所述CCA检测成功后，所述发送单元704发送所述上行信息。当所述时间窗包含多个时间单元时，所述处理单元703可以在每个时间单元的起始时刻之前或者所述起始时刻进行CCA检测，直到CCA检测成功，确定所述时间窗中的一个时间单元空闲，则所述通知所述发送单元704发送所述上行信息。
本发明又一可选的实施例中，所述终端设备在所述时间窗内发送所述上行信息，所述时间窗的起始时刻T1以及时间长度可以通过多种方式进行配置，具体的配置方式参见图3对应的方法实施例的说明，这里不再赘述。
本发明又一可选的实施例中，网络设备还发送指示信息，所述接收单元702接收指示信息，所述处理单元703从所述接收单元702获取所述指示信息，并根据所述指示信息通知所述发送单元704是否在所述时间窗发送上行信息。关于所述指示信息的多种实现方式参见图3对应的方法实施例的说明。
可选的，免授权频段资源上的每个候选时间单元集合中，网络设备可以所只发送所述下行控制信息，或者，发送所述下行控制信息和所述指示信息，或者，除所述下行控制信息，或者所述下行控制信息和所述指示信息之外，还发送下行用户数据。当所述候选时间单元集合中包括所述下行用户数据时，为了不影响免授权频段上的帧结构设计，所述网络设备可以通过上述指示信息指示所述终端设备不在所述时间窗发送上行信息。所述接收单元702接收所述指示信息，所述处理单元703从所述接收单元702获取所述指示信息，确定并通知所述发送单元704是否发送所述上行信息。
本发明实施例提供的终端设备，检测网络设备发送的下行控制信息，确定进行上行信息发送的时间窗，并进行所述上行信息的发送。本发明实施例的方案缩短了上行信息的发送和下行控制信息的接收的时间间隔，保持了免授权频段上的帧结构设计，提高了免授权频段上的数据传输效率。
本发明实施例中的该终端设备可以用于执行上述图3对应的方法实施例中的方法，所述终端设备进行的下行控制信息的接收、发送上行信息的时间窗的确定以及所述上行信息的发送的具体实施方式可参见上述方法实施例中的描述。终端设备所包含的检测单元701、接收单元702、处理单元703以及发送单元704的具体的功能分别与上述图3对应的实施例中的功能对应；其中的术语和实现细节与方法实施例中的类似。
需要说明的是，实际应用中，本实施例中终端设备的功能单元可以是由相应的硬件实现，也可以由相应的硬件执行相应的软件完成，例如，前述的接收单元702，可以是具有执行前述接收模块功能的硬件，如接收器，也可以是能够执行相应计算机程序从而完成前述功能的一般处理器或者其他硬件设备，又如，前述的发送单元704，可以是具有执行前述发送模块功能的硬件，如发射器，也可以是能够执行相应计算机程序从而完成前述功能的一般处理器或者其他硬件设备；再如前述的处理单元703，可以是独立的具有执行处理模块的功能的硬件，如处理器，也可以是能够执行相应计算机程序 从而完成前述功能的其他硬件设备。进一步地，所述检测单元701，可以是独立的具有执行处理模块的功能的硬件，如检测器；也可以集成在上述处理单元703中，由处理器等执行处理模块功能的硬件实现，不再单独设置独立的检测单元701。
需要说明的是，本终端设备的实施例与方法实施例基于同一构思，其带来的技术效果与本发明方法实施例相同，具体内容可参见本发明方法实施例中的叙述，此处不再赘述。
图8为本发明实施例提供的网络设备的一种可能的结构示意图。
网络设备包括发送单元801、处理单元802以及接收单元803，根据实际需要还可以包含存储单元，图中并未示出。
所述发送单元801在免授权频段上的候选时间单元集合上发送下行控制信息，所述下行控制信息由终端设备接收。其中，所述发送单元801在所述候选时间单元集合的第一时间单元内发送所述下行控制信息。
具体的，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复。
所述接收单元803根据所述下行控制信息的发送时间接收所述终端设备发送的上行信息。其中，所述终端设备根据所述下行控制信息的发送时间确定发送上行信息的时间窗，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元，所述下行控制信息的结束时刻为T2。
所述处理单元802确定发送所述下行控制信息的候选时间单元集合，并确定所述第一时间单元。
下面以所述下行控制信息为DRS信号为例，阐述本发明实施例提供的网络设备的可能的结构。本领域技术人员可知，以下实施例仅以DRS信号为例进行解释说明，但是本发明的保护范围不限于所述下行控制信息为DRS的情况，还包括本发明其他部分提到的满足本发明实施例要求的任何类型的下行 控制信息的方式。
本发明一可选的实施例中，所述发送单元801在所述候选时间单元集合的第一时间单元上发送下行控制信息，所述终端设备在T2时刻结束接收所述下行控制信息(考虑到网络时延，所述发送单元801结束发送所述下行控制信息的时刻可能略早于所述T2时刻，这里以T2时刻为终端设备结束接收所述下行控制信息的时刻为基准)，所述终端设备发送所述上行信息的时间窗的起始时刻为T1，所述T1和T2之间存在时间间隔。关于所述T2时刻的位置设计，存在多种可选的实现方式，具体的实现方式参见图3对应的方法实施例的说明，这里不再赘述。
需要说明的是，所述网络设备的发送单元801在T1和T2之间的所述时间间隔内不发送下行用户数据。例如，所述处理单元802通知所述发送单元在所述时间间隔内不足以进行一次下行用户数据传输调度，所述发送单元801不发送下行用户数据；又如，不论所述时间间隔是否足够调度一次下行用户数据传输，由于所述终端设备在所述时间间隔内不接收下行用户数据，所述处理单元802通知所述发送单元801在所述时间间隔内不发送下行用户数据。
本发明又一可选的实施例中，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合可以包含一个时间单元，也可以包含多个时间单元。
例如，当所述候选时间单元集合包含一个时间单元时，所述发送单元801在所述一个时间单元内发送所述下行控制信息。
又如，当所述候选时间单元集合包含多个时间单元时，所述处理单元802在所述多个时间单元中确定一个时间单元上，通知所述发送单元801在所述确定的一个时间单元上发送所述下行控制信息。
进一步地，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复，即在所述多个连续的时间单元上周期性配置所述候选时间单元集合。
进一步可选的，所述发送单元801还发送指示信息，所述指示信息指示终 端设备确定是否在所述时间窗发送上行信息。具体的，所述指示信息可以用于指示该终端设备是否具有所述时间窗，或者是否允许所述终端设备在所述时间窗发送上行信息。所述指示信息可以有多种实现方式，具体的实现方式参见图3对应的方法实施例中的说明，这里不再赘述。
需要说明的是，免授权频段资源上的每个候选时间单元集合中，所述处理单元802可以指示所述发送单元801仅发送所述下行控制信息，或者，发送所述下行控制信息和所述指示信息，或者，除所述下行控制信息，或者所述下行控制信息和所述指示信息之外，还可以发送下行用户数据。
可选的，当所述发送单元801在所述候选时间单元集合中发送的内容包含所述下行用户数据时，为了不影响免授权频段上的帧结构设计，所述处理单元802可以通过上述指示信息指示所述终端设备不在所述时间窗发送上行信息。可选的，所述处理单元802还可以根据多种方式判断是否允许所述终端设备在所述时间窗发送上行信息。这里不再赘述，具体参见图3对应的方法实施例的说明。
本发明实施例中的该网络设备可以用于执行上述图3对应的方法实施例中的方法，上述网络设备进行的下行控制信息发送时间单元的确定、下行控制信息的发送以及终端设备是否可以在相应的时间窗发送上行信息的指示等具体实施方式可参见方法实施例中的描述。网络设备所包含的发送单元801、处理单元802以及接收单元803的具体的功能分别与上述图3对应的实施例中的功能对应；其中的术语和实现细节与方法实施例中的类似。
需要说明的是，实际应用中，本实施例中网络设备的功能单元可以是由相应的硬件实现，也可以由相应的硬件执行相应的软件完成，例如，前述的发送单元801，可以是具有执行前述发送模块功能的硬件，例如发射器，也可以是能够执行相应计算机程序从而完成前述功能的一般处理器或者其他硬件设备；再如前述的处理单元802，可以是具有执行处理模块的功能的硬件，例如处理器，也可以是能够执行相应计算机程序从而完成前述功能的其 他硬件设备；又如，前述的接收单元803，可以是具有执行前述接收模块功能的硬件，例如接收器，也可以是能够执行相应计算机程序从而完成前述功能的一般处理器或者其他硬件设备。
需要说明的是，本网络设备的实施例与方法实施例基于同一构思，其带来的技术效果与本发明方法实施例相同，具体内容可参见本发明方法实施例中的叙述，此处不再赘述。
需要说明的是，本发明以上所有的实施例中，所述时间单元可以为一个无线帧、一个子帧、一个时隙、或者一个符号，也可以是多个无线帧、多个子帧、多个时隙或者多个符号，根据实际通信系统的需要可以灵活设计。优选的，所述时间单元可以为一个子帧。所述时间窗可以包含一个或多个时间单元，所述终端设备在所述时间窗包含的一个或多个时间单元中的一个时间单元上发送所述上行信息。例如，当所述时间窗包含一个时间单元时，所述终端设备在所述一个时间单元内发送所述上行信息。又如，当所述时间窗包含多个时间单元时，所述终端设备确定所述时间窗内的一个时间单元，在所述确定的一个时间单元上发送所述上行信息；其中，所述终端设备通过信道监听的方式确定的方式确定所述时间窗内的一个时间单元，在这种方式下，所述时间窗内的一个时间单元为所述终端设备在所述时间窗内确定抢占到免授权频段资源之后的第一个时间单元。可选的，所述候选时间单元集合中的每个时间单元的长度和所述时间窗中每个时间单元的长度可以相同或不同。
另外，需要说明的是，在本发明以上的所有实施例中，网络设备在第一时间单元发送所述下行控制信息，可以包括所述网络设备在第一时间单元用于传输下行控制信息的时间范围内发送所述下行控制信息。例如，第一时间单元为一个子帧时，第一时间单元用于传输下行控制信息的时间范围对应的时间长度可以是1ms，也可以小于1ms。
应理解，说明书通篇中提到的“一个实施例”，“一实施例”，或“本发明实 施例”意味着与实施例有关的特定特征、结构或特性包括在本发明的至少一个实施例中。因此，在整个说明书各处出现的“在一个实施例中”，“在一实施例中”，或“本发明实施例中”未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
在本发明的各种实施例中，应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
本发明实施例中的处理器可以是中央处理器(CPU)、通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)，现场可编程门阵列(FPGA)或者其他可编程逻辑器件、晶体管逻辑器件，硬件部件或者其任意组合。其可以实现或执行结合本发明公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。
本领域技术人员可知，对于终端设备或网络设备来说，发射器、接收器及处理器的功能并不仅限于配合本发明实施例提供的通信方法流程的执行功能，还可用于配合进行终端设备或网络设备其他功能的执行，例如基础的通讯功能、各种应用程序的执行等，这里不再赘述。
在本申请所提供的实施例中，应理解，“与A相应的B”或者“与A对应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。
结合本发明公开内容所描述的方法的步骤可以硬件的方式来实现，也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成，软件模块可以被存放于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、移动硬盘、CD-ROM或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然， 存储介质也可以是处理器的组成部分。处理器和存储介质可以位于专用集成电路(ASIC)中。另外，该ASIC可以位于终端设备或网络设备中。当然，处理器和存储介质也可以作为分立组件存在于终端设备或网络设备中。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明的保护范围之内。
上述主要从各个网元之间交互的角度对本发明实施例提供的方案进行了介绍。可以理解的是，各个网元，例如UE,基站，核心网络实体等为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本发明能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。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或者该技术方案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计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，简称为ROM)、随机存取存储器(Random Access Memory，简称为RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (38)

  1. 一种免授权频段上的通信方法，其特征在于，包括：
    终端设备接收网络设备发送的下行控制信息，所述下行控制信息位于候选时间单元集合中的第一时间单元内，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复；
    所述终端设备根据所述下行控制信息的发送时间确定发送上行信息的时间窗；
    所述终端设备在所述时间窗内发送所述上行信息；
    其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元。
  2. 根据权利要求1所述的方法，其特征在于：其中，所述下行控制信息的结束时刻为T2，所述方法还包括：
    所述终端设备在所述T1与T2之间的时间间隔内不进行下行用户数据接收。
  3. 根据权利要求1或2所述的方法，其特征在于：
    所述时间窗的起始时刻T1为所述第二时间单元的起始时刻；或者
    所述下行控制信息的结束时刻T2为所述第一时间单元内的第n个OFDM符号，所述时间窗的起始时刻T1为所述第一时间单元内的第n+2个OFDM符号。
  4. 根据权利要求1所述的方法，其特征在于：所述下行控制信息的结束时刻为T2，其中，
    所述T1与T2之间的时间间隔T为收发转换时间。
  5. 根据权利要求1-4中任一项所述的方法，其特征在于：所述终端设备在所述时间窗内发送所述上行信息包括：
    进行空闲信道检测CCA；和
    在所述CCA检测成功后，发送所述上行信息。
  6. 根据权利要求1-5任一项所述的方法，其特征在于：
    所述下行控制信息包括发现参考信号DRS和/或公共控制信息。
  7. 根据权利要求1-6任一项所述的方法，其特征在于：
    所述上行信息包含随机接入过程中的上行信息、上行传输调度请求SR、探测参考信号SRS和周期信道状态信息P-CSI中的一个或多个。
  8. 根据权利要求1-7任一项所述的方法，其特征在于：所述方法还包括：
    所述终端设备接收指示信息，所述指示信息用于指示所述终端设备是否具有所述时间窗或指示所述终端设备是否允许在所述时间窗内发送所述上行信息。
  9. 根据权利要求8所述的方法，其特征在于：当第一时间单元内具有网络设备发送的下行用户数据时，所述指示信息指示不具有所述时间窗或不允许在所述时间窗内发送所述上行信息。
  10. 根据权利要求1-9任一项所述的方法，其特征在于：所述时间单元为子帧。
  11. 一种免授权频段上的通信方法，其特征在于，包括：
    网络设备在第一时间单元内发送下行控制信息，所述第一时间单元包含在一候选时间单元集合中，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复；
    所述网络设备根据所述下行控制信息的发送时间接收上行信息，所述上行信息位于一时间窗中；
    其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元。
  12. 根据权利要求11所述的方法，其特征在于：其中，所述下行控制信息的结束时刻为T2，所述方法还包括：
    所述网络设备在所述T1与T2之间的时间间隔内不发送下行用户数据。
  13. 根据权利要求11或12所述的方法，其特征在于，
    所述时间窗的起始时刻T1为所述第二时间单元的起始时刻；或者
    所述下行控制信息的结束时刻T2为所述第一时间单元内的第n个OFDM符号，所述时间窗的起始时刻T1为所述第一时间单元内的第n+2个OFDM符号。
  14. 根据权利要求11所述的方法，其特征在于，所述下行控制信息的结束时刻为T2，其中，
    所述T1与T2之间的时间间隔T为收发转换时间。
  15. 根据权利要求11-14任一项所述的方法，其特征在于：
    所述下行控制信息包括发现参考信号DRS和/或公共控制信息。
  16. 根据权利要求11-15任一项所述的方法，其特征在于：
    所述上行信息包含随机接入过程中的上行信息、探测参考信号SRS、上行传输调度请求SR、和周期信道状态信息P-CSI中的一个或多个。
  17. 根据权利要求11-16任一项所述的方法，其特征在于：
    所述网络设备还发送指示信息，所述指示信息用于指示终端设备是否具有所述时间窗或指示是否允许终端设备在所述时间窗内发送所述上行信息。
  18. 根据权利要求17所述的方法，其特征在于，所述网络设备还发送指示信息，包括：
    当所述网络设备在所述第一时间单元内发送下行用户数据时，所述指示信息指示所述终端设备不具有所述时间窗或不允许在所述时间窗内发送所述上行信息。
  19. 根据权利要求11-18任一项所述的方法，其特征在于：
    所述时间单元为子帧。
  20. 一种终端设备，其特征在于，包括：
    接收单元，用于接收网络设备发送的下行控制信息，所述下行控制信息位于候选时间单元集合中的第一时间单元内，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个 连续的时间单元上等间隔重复；
    处理单元，用于根据所述下行控制信息的发送时间确定发送上行信息的时间窗；
    发送单元，用于在所述时间窗内发送所述上行信息；
    其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元。
  21. 根据权利要求20所述的终端设备，其特征在于：其中，所述下行控制信息的结束时刻为T2；
    所述接收单元不在所述T1与T2之间的时间间隔内接收下行用户数据。
  22. 根据权利要求20或21所述的终端设备，其特征在于：
    所述时间窗的起始时刻T1为所述第二时间单元的起始时刻；或者
    所述下行控制信息的结束时刻T2为所述第一时间单元内的第n个OFDM符号，所述时间窗的起始时刻T1为所述第一时间单元内的第n+2个OFDM符号。
  23. 根据权利要求20所述的终端设备，其特征在于：所述下行控制信息的结束时刻为T2，其中，
    所述T1与T2之间的时间间隔T为收发转换时间。
  24. 根据权利要求20-23中任一项所述的终端设备，其特征在于：所述发送单元在所述时间窗内发送所述上行信息包括：
    进行空闲信道检测CCA；和
    在所述CCA检测成功后，发送所述上行信息。
  25. 根据权利要求20-24任一项所述的终端设备，其特征在于：
    所述下行控制信息包括发现参考信号DRS和/或公共控制信息。
  26. 根据权利要求20-25任一项所述的终端设备，其特征在于：
    所述上行信息包含随机接入过程中的上行信息、上行传输调度请求SR、探测参考信号SRS和周期信道状态信息P-CSI中的一个或多个。
  27. 根据权利要求20-26任一项所述的终端设备，其特征在于：
    所述接收单元还接收指示信息，所述指示信息用于指示所述终端设备是否具有所述时间窗或指示所述终端设备是否允许在所述时间窗内发送所述上行信息。
  28. 根据权利要求27所述的终端设备，其特征在于：
    当第一时间单元内具有网络设备发送的下行用户数据时，所述指示信息指示不具有所述时间窗或不允许在所述时间窗内发送所述上行信息。
  29. 根据权利要求20-28任一项所述的终端设备，其特征在于：所述时间单元为子帧。
  30. 一种网络设备，其特征在于，包括：
    发送单元，用于在第一时间单元内发送下行控制信息，所述第一时间单元包含在一候选时间单元集合中，所述候选时间单元集合为多个连续的时间单元中的至少一个时间单元，所述候选时间单元集合在所述多个连续的时间单元上等间隔重复；
    接收单元，用于根据所述下行控制信息的发送时间接收上行信息，所述上行信息位于一时间窗中；
    其中，所述时间窗的起始时刻T1位于所述第一时间单元内或第二时间单元内，所述第二时间单元为所述第一时间单元的下一个时间单元。
  31. 根据权利要求30所述的网络设备，其特征在于：
    其中，所述下行控制信息的结束时刻为T2；
    所述发送单元不在所述T1与T2之间的时间间隔内发送下行用户数据。
  32. 根据权利要求30或31所述的网络设备，其特征在于，
    所述时间窗的起始时刻T1为所述第二时间单元的起始时刻；或者
    所述下行控制信息的结束时刻T2为所述第一时间单元内的第n个OFDM符号，所述时间窗的起始时刻T1为所述第一时间单元内的第n+2个OFDM符号。
  33. 根据权利要求30所述的网络设备，其特征在于，所述下行控制信息的结束时刻为T2，其中，
    所述T1与T2之间的时间间隔T为收发转换时间。
  34. 根据权利要求30-33任一项所述的网络设备，其特征在于：
    所述下行控制信息包括发现参考信号DRS和/或公共控制信息。
  35. 根据权利要求30-34任一项所述的网络设备，其特征在于：
    所述上行信息包含随机接入过程中的上行信息、探测参考信号SRS、上行传输调度请求SR、和周期信道状态信息P-CSI中的一个或多个。
  36. 根据权利要求30-35任一项所述的网络设备，其特征在于：
    所述发送单元还用于发送指示信息，所述指示信息用于指示终端设备是否具有所述时间窗或指示是否允许终端设备在所述时间窗内发送所述上行信息。
  37. 根据权利要求36所述的网络设备，其特征在于：
    当所述发送单元在所述第一时间单元内发送下行用户数据时，所述指示信息指示所述终端设备不具有所述时间窗或不允许在所述时间窗内发送所述上行信息。
  38. 根据权利要求30-37任一项所述的网络设备，其特征在于：
    所述时间单元为子帧。
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