WO2018171681A1 - 一种下行同步信号发送方法和接收方法及设备 - Google Patents

一种下行同步信号发送方法和接收方法及设备 Download PDF

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Publication number
WO2018171681A1
WO2018171681A1 PCT/CN2018/080062 CN2018080062W WO2018171681A1 WO 2018171681 A1 WO2018171681 A1 WO 2018171681A1 CN 2018080062 W CN2018080062 W CN 2018080062W WO 2018171681 A1 WO2018171681 A1 WO 2018171681A1
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WO
WIPO (PCT)
Prior art keywords
synchronization signal
notification information
downlink synchronization
frequency band
base station
Prior art date
Application number
PCT/CN2018/080062
Other languages
English (en)
French (fr)
Inventor
黄磊
林英沛
吴霁
Original Assignee
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.)
Filing date
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 EP18771767.3A priority Critical patent/EP3589036A4/en
Publication of WO2018171681A1 publication Critical patent/WO2018171681A1/zh
Priority to US16/577,328 priority patent/US20200037277A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • 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
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • 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
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance

Definitions

  • the present application relates to communication technologies, and in particular, to a method and an apparatus for downlink synchronization signal transmission.
  • the bandwidth resources in the high-frequency band are very rich. Some of the bandwidth resources belong to the licensed band and need to be authorized for use. Other bandwidth resources are unlicensed and can be used without authorization.
  • countries or regions have enacted regulations to ensure the fairness and performance of unlicensed bands.
  • the listen before talk (LBT) mechanism the LBT mechanism requires that any device that uses an unlicensed band needs to detect the unlicensed band first to determine whether the unlicensed band is occupied, if the unlicensed band is not Occupied, the device can occupy and carry out data transmission.
  • the duration of the occupied non-licensed frequency band is limited.
  • the unlicensed frequency band occupied by the device When the occupied time reaches a predetermined value, the unlicensed frequency band occupied by the device will be released. If data transmission still needs to be performed, LBT needs to be performed again to seize resources.
  • the LBT mechanism is a very effective way to share unlicensed bands to ensure fair use of resources.
  • an LBT mechanism is also required.
  • the LBT mechanism will have a certain impact on the downlink synchronization design of the 5G communication system, for example, causing the synchronization detection window to be indeterminate, thereby affecting the efficiency of the user equipment accessing the 5G communication system. Therefore, how to design the corresponding mechanism to eliminate the impact of the LBT mechanism on the 5G communication system is called an urgent problem to be solved.
  • the embodiment of the present application provides a method for transmitting a downlink synchronization signal, and proposes a mechanism for improving downlink signal transmission efficiency of an unlicensed band.
  • an embodiment of the present application provides a method for transmitting a downlink synchronization signal.
  • the method includes: the base station generates, by the base station, notification information that includes a status indication indicating a transmission status of the downlink synchronization signal on the unlicensed frequency band, where the transmission status is that the downlink synchronization signal is successfully sent or the transmission fails; the base station sends the notification by using the licensed frequency band. information.
  • Whether the downlink synchronization signal in the user equipment or the unlicensed frequency band is successfully transmitted is avoided by transmitting the notification information including the status indication indicating the transmission status of the downlink synchronization signal on the unlicensed frequency band in the authorized frequency band, and avoiding when the downlink synchronization signal is not received. Switch the current receive beam.
  • the base station performs channel sounding before transmitting the downlink synchronization signal in the unlicensed frequency band.
  • the base station When the channel is idle, the base station generates the notification information including the ACK message when the downlink synchronization signal is sent in the unlicensed frequency band.
  • the notification information including the ACK message is used to indicate to the user equipment that the downlink synchronization signal has been successfully transmitted.
  • the base station When the channel is not idle, the base station fails to send the downlink synchronization signal in the unlicensed frequency band, and generates notification information including the NACK message.
  • the downlink synchronization signal When the channel is not idle, the downlink synchronization signal is sent, and the notification information including the NACK message is used to indicate to the user equipment that the downlink synchronization signal is failed to be sent.
  • the base station has multiple transmit beams, the multiple transmit beams are divided into multiple beam packets, and the downlink synchronization signal is a plurality of synchronization signal bursts, each of the beam packets There is one beam packet ID and corresponds to one of the synchronization signal bursts, and the notification information further includes the beam packet ID.
  • the notification information when the unlicensed frequency band has multiple component carriers, the notification information further includes a component carrier ID, where the component carrier ID is used to indicate a transmission state of the downlink synchronization signal.
  • Component carrier when the unlicensed frequency band has multiple component carriers, the notification information further includes a component carrier ID, where the component carrier ID is used to indicate a transmission state of the downlink synchronization signal.
  • the notification information when the unlicensed frequency band sends a synchronization signal through multiple radio frequency channels, the notification information further includes a radio frequency channel ID, where the radio frequency channel ID is used to indicate the sending of the downlink synchronization signal.
  • the RF channel corresponding to the status.
  • an embodiment of the present application provides a transmitting device having a function of implementing a behavior of a base station in a method for transmitting a downlink synchronization signal.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the structure of the transmitting device includes a processor and a transmitter configured to support the base station to perform a corresponding function in the above-described downlink synchronization signal transmitting method.
  • the transmitter is configured to support communication between the transmitting device and the receiving device, and send the notification information to the receiving device.
  • the transmitting device can also include a memory for coupling with the processor that holds program instructions and data necessary for the transmitting device.
  • an embodiment of the present application provides a method for receiving a downlink synchronization signal.
  • the method includes: the user equipment detects and receives the notification information in the licensed frequency band, where the notification information includes a status indication indicating a transmission status of the downlink synchronization signal from the base station on the unlicensed frequency band, where the user equipment has one or more receiving beams; The user equipment determines, according to the notification information, whether to switch the current receiving beam to receive the downlink synchronization signal of the unlicensed band.
  • the user equipment determines, according to the notification information, whether to switch the current receiving beam to receive the downlink synchronization signal of the unlicensed frequency band, including:
  • the user equipment switches the current receiving beam to receive the downlink synchronization signal of the unlicensed band.
  • the receiving beam is switched so that the next receiving beam starts receiving the downlink synchronization signal.
  • the user equipment determines, according to the notification information, whether to switch the handover of the receive beam includes:
  • the user equipment When the NACK message is included in the notification information, the user equipment continues to use the current receiving beam to receive the downlink synchronization signal of the unlicensed band.
  • the receiving beam is not switched to avoid the current receiving beam missing the downlink synchronization signal.
  • an embodiment of the present application provides a receiving device having a function of implementing user equipment behavior in a method for transmitting a downlink synchronization signal, where the receiving device has multiple receiving beams.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the receiving device includes a receiver and a processor for supporting communication between the receiving device and the transmitting device, and configured to detect and receive the notification information in the licensed frequency band.
  • the processor is configured to support a receiving device to perform a corresponding function of the user equipment in the downlink synchronization signal transmitting method.
  • the receiving device can also include a memory for coupling with the processor that holds program instructions and data necessary for the receiving device.
  • Yet another aspect of the present application provides a computer readable storage medium having instructions stored therein that, when executed on a computer, cause the computer to perform the methods described in the above aspects.
  • Yet another aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods described in the various aspects above.
  • FIG. 1 is a schematic diagram of a possible application scenario according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of a synchronization signal burst set according to an embodiment of the present application
  • FIG. 3 is a schematic flowchart diagram of a downlink synchronization signal method according to an embodiment of the present application
  • FIG. 4 is a schematic diagram of a time window of a downlink synchronization signal according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of describing a time window based on a frame structure in an embodiment of the present application.
  • FIG. 6 is a schematic diagram of sending notification information in an embodiment of the present application.
  • FIG. 7 is a schematic diagram of sending notification information according to another embodiment of the present application.
  • FIG. 8 is a schematic diagram of sending notification information in another embodiment of the present application.
  • FIG. 9 is a schematic diagram of sending notification information in another embodiment of the present application.
  • FIG. 10 is a schematic diagram of sending notification information according to still another embodiment of the present application.
  • FIG. 11 is a schematic diagram of sending notification information in another embodiment of the present application.
  • FIG. 12 is a schematic diagram showing a simplified structure of a transmitting device according to an embodiment of the present application.
  • FIG. 13 is a schematic diagram showing a simplified structure of a receiving device according to an embodiment of the present application.
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • the embodiments of the present application can be applied to a wireless communication system, including but not limited to: a narrowband Internet of Things system (English: Narrow Band-Internet of Things, referred to as NB-IoT), and a global mobile communication system (English: Global System for Mobile Communications (GSM), Enhanced Data Rate for GSM Evolution (EDGE), Wideband Code Division Multiple Access (WCDMA) ), Code Division Multiple Access 2000 (English: Code Division Multiple Access, CDMA2000 for short), Time Division-Synchronization Code Division Multiple Access (TD-SCDMA), Long Term Evolution System (English: Long Term Evolution, LTE for short) and the three major application scenarios of the next-generation 5G mobile communication system, eMBB, URLLC and eMTC.
  • GSM Global System for Mobile Communications
  • EDGE Enhanced Data Rate for GSM Evolution
  • WCDMA Wideband Code Division Multiple Access
  • CDMA2000 Code Division Multiple Access 2000
  • TD-SCDMA Time Division-Synchronization Code Division Multiple Access
  • LTE Long Term Evolution
  • the transmitting device mentioned in the embodiment of the present application may be a base station, and the base station is a device deployed in the wireless access network to provide a wireless communication function for the user equipment.
  • the base station may include various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points, and the like.
  • the name of a device having a base station function may be different, for example, in an LTE system, an evolved Node B (evolved NodeB, eNB or eNodeB), in the third In the system (English: 3rd Generation, 3G for short), it is called Node B (English: Node B).
  • the foregoing apparatus for providing a wireless communication function to a user equipment is collectively referred to as a base station or a BS.
  • the user equipment (UE) involved in the embodiments of the present application may include various terminals having wireless communication functions, handheld devices, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to the wireless modem.
  • the MS terminal may also be referred to as a terminal user equipment (UE), and may also include a subscriber unit (English: subscriber unit), a cellular phone (English: cellular phone), a smart phone (English: smart phone), Wireless data card, personal digital assistant (English: Personal Digital Assistant, PDA for short), tablet computer, wireless modem (English: modem), handheld device (English: handset), laptop (English: laptop computer) , Machine type communication (English: Machine Type Communication, referred to as: MTC) terminal.
  • MTC Machine type communication
  • Authorized frequency band refers to the frequency domain resources that can only be used after being approved by the management of the communications industry.
  • Unlicensed frequency band refers to frequency domain resources that can be directly used without the permission of the management department of the communication industry under the premise of meeting relevant technical requirements, such as the 5 GHz frequency band.
  • the licensed band transmission information can realize the shunting of the network capacity.
  • LAA Licensed Assisted Access
  • the base station can simultaneously perform data communication with the user equipment through the licensed frequency band and the unlicensed frequency band. Specifically, the user equipment has accessed the wireless communication system through the licensed frequency band, but at the same time, the user equipment also performs data communication through the unlicensed frequency band. Therefore, the downlink synchronization process of the unlicensed frequency band is required.
  • the downlink synchronization signal is periodically transmitted, and a complete period corresponds to a Synchronization Signal Burst (SSB) set.
  • SSB Synchronization Signal Burst
  • Each of the synchronization signal burst sets includes a plurality of synchronization signal bursts, each of the synchronization signal bursts includes a plurality of synchronization signal blocks, and each of the synchronization signal blocks includes a primary synchronization signal (PSS) and a secondary signal Secondary synchronization signal (SSS).
  • PSS primary synchronization signal
  • SSS secondary signal Secondary synchronization signal
  • a base station has L transmit beams and a user equipment has N receive beams as an example.
  • 2 is a synchronization signal burst including a synchronization signal burst included in a synchronization signal burst set, that is, a synchronization signal burst included in a synchronization signal burst set and a number of receiving beams of the user equipment, wherein each synchronization signal A burst corresponds to a receive beam of the user equipment.
  • a sync signal burst includes L sync signal blocks, each sync signal block corresponding to one transmit beam of the base station.
  • each of the transmission beams of the base station has transmitted the synchronization signal block.
  • the user equipment receives a synchronization signal burst, one receiving beam of the user equipment can receive the synchronization signal of the L transmitting beams from the base station.
  • each receive beam of the user equipment can receive a synchronization signal for each of the transmit beams respectively from the base station.
  • the number of synchronization signal bursts included in the synchronization signal burst set may not be equal to the number of receiving beams of the user equipment, and the flexibility of the synchronization signal burst setting is improved.
  • FIG. 3 is a flowchart of steps of a downlink synchronization signal sending method according to an embodiment of the present application.
  • the base station generates, by the base station, notification information that includes a status indication indicating a transmission status of the downlink synchronization signal on the unlicensed frequency band, where the transmission status is that the downlink synchronization signal is successfully sent or the transmission fails.
  • the base station sends the notification information by using the licensed frequency band, where the notification information includes status indication information of a sending status of the downlink synchronization signal.
  • the user equipment receives the notification information. Therefore, the user equipment can determine whether the downlink synchronization signal of the base station is successfully sent by using the notification information.
  • the user equipment determines, according to the notification information, whether to switch the current receiving beam to receive the downlink synchronization signal of the unlicensed band.
  • the notification information of the status indication indicating the transmission status of the downlink synchronization signal on the unlicensed frequency band is sent in the authorized frequency band, so that the user equipment obtains whether the downlink synchronization signal in the unlicensed frequency band is successfully transmitted, and improves the efficiency of downlink synchronization of the unlicensed frequency band.
  • the base station sends the downlink synchronization signal and the notification information in a predetermined time window, and accordingly, the user equipment detects the downlink synchronization signal and the notification information in the corresponding time window.
  • the predetermined time window can be periodic or triggered by a particular event.
  • a contention channel is required for signal transmission, that is, there is a possibility that the contention channel succeeds, the signal is successfully transmitted, and the contention channel fails, and the signal transmission fails.
  • the base station can obtain whether the downlink synchronization signal is successfully sent by itself.
  • the base station generates notification information including a status indication indicating a transmission status of the downlink synchronization signal on the unlicensed frequency band.
  • the time window in which the base station transmits the downlink synchronization signal is hereinafter referred to as “synchronous transmission time window”, and the time window in which the base station transmits the notification information is referred to as “notification transmission time window”.
  • synchronous transmission time window The time at which the base station is used for channel sensing in the unlicensed band may or may not be included.
  • a time window in which the user equipment detects the downlink synchronization signal is referred to as a “synchronization detection time window”
  • a time window in which the user equipment detects the notification information is referred to as a “notification detection time window”.
  • the notification transmission time window may be set after the synchronization transmission time window, and the notification detection time window corresponds to the notification transmission time window.
  • the length of the notification detection time window is usually greater than or equal to the notification transmission time window, thereby ensuring that the user equipment detects the notification information at a sufficient time.
  • the unlicensed and licensed bands usually use different frame structures.
  • the time window will be described based on the frame structure.
  • the licensed frequency band adopts a subcarrier spacing of 60 kHz, and includes eight slots in one 1 ms subframe.
  • the unlicensed band uses a subcarrier spacing of 480 kHz, and the subframe of 1 ms contains 32 time slots.
  • the scheduling period is 1 time slot, the user equipment can schedule 8 times in one subframe of the licensed frequency band and 32 times in one subframe of the unlicensed frequency band.
  • the first downlink synchronization signal burst in the unlicensed frequency band is transmitted in the fifth time slot of the kth subframe, which corresponds to the first time slot of the kth subframe of the licensed frequency band; the second synchronization signal When the burst is transmitted in the 5th slot of the k+mth subframe, it corresponds to the 1st slot of the k+m subframe of the licensed band. Then, the notification information needs to be sent between the second slot of the kth subframe of the unlicensed frequency band and the zeroth slot of the k+mth subframe.
  • the length of the notification detection time window may be 5 time slots.
  • the notification detection time window is the third to seventh time slots on the licensed frequency band.
  • the foregoing notification information may be notified to the user equipment by using a Physical Downlink Control Channel (PDCCH).
  • a Physical Downlink Control Channel For example, a synchronization signal Radio Network Temporary Identity (SS-RNTI) and Downlink Control Information (DCI) format are defined for the notification information.
  • the SS-RNTI is used to identify the user equipment corresponding to the notification information, and the DCI is used to carry the foregoing notification information.
  • the user equipment detects in the Common Search Space (CSS) of the physical downlink control channel through the RNTI in the notification detection time window.
  • CCS Common Search Space
  • the foregoing notification information may also be used to notify the user equipment by using Media Access Control (MAC) signaling.
  • the MAC signaling includes the foregoing notification information.
  • the user equipment detects in the CSS of the PDCCH through the SS-RNTI in the notification detection time window.
  • the DCI information is read, where the DCI information includes resource allocation information in which the MAC signaling is located, and the MAC signaling is obtained through the resource allocation information, thereby obtaining the foregoing notification information.
  • the base station In the unlicensed frequency band, the base station needs to perform LBT first, and transmit the synchronization signal burst when the channel is idle. Since the length of one transmission period of the synchronization signal burst set may be greater than the maximum occupation time of the LBT, LBT may be performed multiple times during one transmission period of the synchronization signal burst set.
  • the base station transmits the downlink synchronization signal burst in the unlicensed frequency band by using N synchronous transmission time windows. In each synchronous transmission time window, the base station first performs channel sensing to determine whether the channel is idle. Only when the channel is idle, the base station can preempt the channel to transmit the downlink synchronization signal burst.
  • the base station uses four synchronous transmission time windows to send four synchronization signal bursts SSB#0, SSB#1, SSB#2, and SSB#3 as an example, wherein four synchronization signal bursts are used.
  • 0 SSB #0
  • synchronization signal burst #1 SSB #1
  • SSB #2 SSB #2
  • SSB #3 SSB #3
  • the preemptive channel transmits the synchronization signal burst #0.
  • the synchronization signal burst #0 is successfully transmitted, the base station generates notification information including an acknowledgement (ACK) message, and transmits the notification information through the authorized frequency band in the notification transmission time window.
  • the notification information can also be understood as the ACK message itself.
  • the user equipment detects the downlink synchronization signal in the unlicensed frequency band by using the receive beam RX0 in the synchronous detection time window, and receives the downlink synchronization signal burst #0. After detecting the ACK message in the authorized frequency band in the notification detection time window, the user equipment switches to the reception beam RX1, and the downlink synchronization signal is detected by the reception beam RX1 in the next synchronization detection time window.
  • the base station In the second synchronous transmission time window, the base station detects that the channel is not idle in the unlicensed frequency band, and fails to preempt the channel transmission synchronization signal burst #1. At this time, the synchronization signal burst #1 is not successfully transmitted.
  • the base station generates notification information including a negative acknowledgement (NACK) message, and transmits the notification information on the authorized frequency band in the notification transmission time window.
  • NACK negative acknowledgement
  • the notification information can also be understood as the NACK message itself.
  • the user equipment fails to detect the downlink synchronization signal in the unlicensed frequency band by using the receive beam RX1 in the synchronous detection time window, but after the notification detection time window detects the notification information including the NACK message in the authorized frequency band, the reception beam is not switched.
  • a synchronous detection time window continues to detect the downlink synchronization signal from the current receive beam RX1.
  • the base station In the third synchronous transmission time window, the base station detects that the channel is idle in the unlicensed frequency band, and the preemptive channel transmits the downlink synchronization signal. Since the sync signal burst #1 is not successfully transmitted, the base station continues to transmit the sync signal burst #1 in the third synchronous transmission time window, and the sync signal burst #1 is successfully transmitted. The base station generates notification information including the ACK message, and transmits notification information including the ACK message in the authorized frequency band in the notification transmission time window.
  • the user equipment receives the downlink synchronization signal by using the receive beam RX1 in the unlicensed frequency band in the synchronous detection time window, and receives the synchronization signal burst #1; after the user equipment detects the notification information including the ACK message in the authorized frequency band in the notification detection time window, Switching to the receive beam RX2, the downlink sync signal is detected by the receive beam RX2 in the next sync detection time window.
  • the base station preempts the channel to respectively transmit the downlink synchronization signal bursts #2 and #3, and the process is similar to the first synchronous transmission time window, and details are not described herein again. Thereby, the base station completes the transmission traversal of the transmission beam, and the user equipment completes the reception traversal of the reception beam.
  • the receiving beams RX0 to RX3 of the user equipment respectively successfully receive the synchronization signal bursts #0 to #3 including the respective transmitting beam synchronization signals of the base station to complete synchronization with the base station.
  • the base station may adopt another design manner for transmitting the notification information.
  • the difference from the embodiment shown in FIG. 6 is the manner in which the notification information indicates the state of the synchronization signal transmission state.
  • the differences between the two will be emphasized.
  • the base station After the base station detects that the channel is idle and the preempted channel successfully transmits the synchronization signal burst in a certain synchronous transmission time window, the base station does not send the notification information and continues to transmit the next synchronization signal burst.
  • the user equipment receives the synchronization signal burst in the unlicensed frequency band in the synchronization detection time window, and does not receive the notification information in the notification detection time window, and then switches the next reception beam to detect the downlink synchronization signal.
  • the base station When the base station detects that the channel is not idle in an unlicensed frequency band in a certain synchronization time window and fails to successfully send the downlink synchronization signal, the base station generates a notification message including the NACK message, and notifies the transmission time window to the user equipment in the authorized frequency band. Send, continue to send the current sync signal burst in the next time window.
  • the notification information only contains a NACK message, the notification information can also be understood as the NACK message itself.
  • the user equipment does not receive the synchronization signal burst in the unlicensed frequency band in the synchronization detection time window, and receives the notification information including the NACK message in the authorized frequency band in the notification detection time window, and does not switch the reception beam, and continues to use the current handover beam.
  • the reception of the downlink synchronization signal of the unlicensed band is performed.
  • the base station successfully transmits the synchronization signal burst in the unlicensed frequency band in a certain synchronous transmission time window, does not generate the notification information, and transmits another synchronization signal burst in the next synchronous transmission time window; the base station is in a certain synchronous transmission time window.
  • the authorized frequency band fails to transmit the synchronization signal burst, generates notification information including the NACK message, and continues to transmit the current synchronization signal burst in the next synchronous transmission time window.
  • the user equipment switches the receiving beam when the notification detecting time window does not receive the notification information in the authorized frequency band, and the user equipment does not switch the receiving beam when the notification detecting time window receives the notification information including the NACK message in the authorized frequency band.
  • the base station may also adopt another design manner for transmitting the notification information.
  • the difference from the embodiment shown in FIG. 7 is the manner in which the notification information indicates the state of the synchronization signal transmission state.
  • the differences between the two will be emphasized.
  • the base station After the base station detects that the channel is idle and the preempted channel successfully transmits the synchronization signal burst in an unscheduled transmission time window, the base station generates a notification message including the ACK message and transmits the authorization frequency band to the user equipment in the notification transmission time window. send.
  • the notification information only contains an ACK message
  • the notification information can also be understood as the ACK message itself.
  • the user equipment receives the synchronization signal burst through the unlicensed frequency band in a certain synchronization detection time window, and receives the notification information including the ACK message in the notification detection time window, and then switches the next reception beam to detect the downlink synchronization signal.
  • the base station When the base station detects that the channel is not idle through an unlicensed band in a certain synchronous transmission time window and fails to transmit the downlink synchronization signal successfully, the base station does not send the notification information, and continues to transmit the synchronization signal burst in the next time window.
  • the user equipment does not receive the synchronization signal burst in the unlicensed frequency band in the synchronization detection time window, does not receive the notification information in the notification detection time window, does not switch the reception beam, and continues to use the current reception beam to perform the downlink synchronization signal. receive.
  • the base station when the base station successfully transmits the synchronization signal burst in the unlicensed frequency band in a synchronous transmission time window, the base station generates the notification information including the ACK message and sends the notification time window after the synchronization transmission time window; the base station is in a certain synchronization transmission time.
  • the window does not send a synchronization signal burst in the unlicensed band, the notification message is not sent.
  • the user equipment performs handover of the reception beam when receiving the notification information including the ACK message in the notification detection time window, and does not perform handover of the reception beam when the notification detection time window does not receive the notification information.
  • the number of synchronization signal blocks in a synchronization signal burst is smaller than the number of transmission beams of the base station, multiple synchronization signal bursts are required to complete the transmission of the synchronization signals of all the transmission beams of the base station.
  • the base station transmission beam is grouped, and the number of transmission beams of each group may be less than or equal to the number M of synchronization signal blocks in one synchronization signal burst, and M is a positive integer greater than 1.
  • the notification information also includes a beam packet ID. In this way, the base station can transmit the transmit beam packet.
  • each receiving beam of the user equipment needs to receive the synchronization signal bursts of the respective transmitting beam groups of the base station.
  • the beam group #0 includes four transmission beams B0 to B3 corresponding to the synchronization signal burst group 0; the beam group #1 includes four transmission beams B4 to B7 corresponding to the synchronization signal burst group 1. That is, the traversal of the transmission beam by the base station requires two synchronization signal bursts, each synchronization signal burst includes four synchronization signal blocks, the ID of the synchronization signal burst group 0 is 0, and the ID of the synchronization signal burst group 1 is 1.
  • the base station detects that the channel is idle in the unlicensed frequency band in the first synchronous transmission time window, and the preemptive channel transmits the synchronization signal burst #0 group 0.
  • the number of downlink synchronization signal bursts received by the user equipment is less than 2, and the reception is continued by the reception beam RX0.
  • the synchronization signal burst #0 group 1 fails to transmit successfully, and the number of downlink synchronization signal bursts received by the user equipment is less than 2, and the reception beam RX0 continues to be used for reception.
  • the base station continues to transmit the synchronization signal burst #0 group 1 in the third synchronous transmission time window.
  • the user equipment detects the downlink synchronization signal by using the receive beam RX0, and receives the synchronization signal burst #0 group 1 in the unlicensed frequency band in the synchronization detection time window, and receives the included beam packet ID in the authorized detection time window in the notification detection time window. 1 and notification information of the ACK message.
  • the number of downlink synchronization signal bursts received by RX0 of the user equipment is equal to 2, and the reception receiving beam RX1 is received.
  • the base station continues to transmit the synchronization signal burst #1 group 0 and the synchronization signal burst #1 group 1, and the user equipment detects the downlink synchronization signal by using the reception beam RX1.
  • the base station transmits a beam packet to the base station to perform downlink synchronization signal transmission, it is possible to adapt to a scenario in which the base station side transmits a large number of beams.
  • the notification information further includes a component carrier ID number.
  • CCs component carriers
  • the base station sends a downlink synchronization signal on multiple component carriers of the unlicensed frequency band, and the user equipment performs downlink synchronization signal detection on the multiple component carriers.
  • the base station sends the notification information including the status indication of the downlink synchronization signal transmission status on each component carrier to the user equipment by using the licensed frequency band, and the user equipment separately detects the notification information on each component carrier.
  • the notification information may be used to notify the user equipment whether the downlink synchronization signal burst on the plurality of component carriers is successfully transmitted. If the synchronization signals on the multiple component carriers are sent in different configurations, the plurality of notification information may also be used to notify the user equipment whether the downlink synchronization signal bursts on the multiple component carriers are successfully sent.
  • the base station After the downlink synchronization signal burst of each component carrier, the base station sends notification information to the user equipment through the licensed frequency band.
  • the base station transmits the SSB in the first synchronous transmission time window of CC0.
  • the base station detects that the channel corresponding to CC0 is idle in the unlicensed frequency band, and the preemptive channel transmits a synchronization signal burst.
  • the user equipment uses the receive beam RX0 to detect the downlink synchronization signal on the component carrier CC0 of the unlicensed frequency band in the synchronous detection time window, and receives the synchronization signal burst #0, and receives the inclusion in the licensed frequency band in the notification detection time window.
  • the ID of the component carrier and the notification information of the ACK message, and the user equipment switches the reception beam to RX1.
  • the channel corresponding to CC0 is idle, the base station transmits the synchronization signal burst #1, and the user equipment device receives the synchronization signal burst #1 and switches the reception beam to RX2.
  • the base station transmits a synchronization signal burst #2 in the third synchronous transmission time window of CC0.
  • the base station detects that the channel corresponding to CC0 is not idle in the unlicensed frequency band, and fails to successfully transmit the synchronization signal burst #2.
  • the user equipment detects the downlink synchronization signal in the synchronization detection time window by using the reception beam RX2, does not detect the synchronization signal burst #2, and receives the ID including the component carrier and the notification information of the NACK message in the authorized frequency band in the notification detection time window.
  • the user equipment does not switch the receiving beam, and continues to use the current receiving beam RX2 to detect the downlink synchronization signal in the next time window.
  • the base station similarly transmits the synchronization signal bursts #2 and #3, and accordingly, the user receives the synchronization signal bursts #2 and #3 in a similar manner.
  • the base station transmits a synchronization signal burst #0 in the first synchronous transmission time window of CC1.
  • the user equipment uses the receive beam RX0 to detect the downlink synchronization signal on the component carrier CC1 of the unlicensed frequency band in the synchronous detection time window, and receives the synchronization signal burst #0, and receives the included component in the licensed frequency band in the notification detection time window.
  • the ID of the carrier and the notification information of the ACK message, and the user equipment switches the reception beam to RX1.
  • the base station continues to transmit the synchronization signal burst #1.
  • the base station detects that the channel corresponding to CC1 is not idle in the unlicensed frequency band, and fails to successfully transmit the synchronization signal burst #1.
  • the user equipment detects the downlink synchronization signal by using the receive beam RX1 in the synchronous detection time window, fails to detect the synchronization signal burst #1 in the unlicensed frequency band, and receives the notification information including the component carrier ID and the NACK message in the licensed frequency band.
  • the user equipment does not switch the receiving beam, and continues to use the current receiving beam RX1 to detect the downlink synchronization signal in the next time window.
  • the base station similarly transmits the synchronization signal bursts #1, #2 and #3, and accordingly, the user receives the synchronization signal bursts #1, # in a similar manner. 2 and #3. It can be seen that the result of performing channel sounding on each component carrier is different, because the state of the corresponding channel of each component carrier is different or the corresponding channel of each component carrier is interfered with.
  • the base station in an application scenario in which a synchronization signal is sent through multiple radio frequency channels, the base station simultaneously transmits downlink synchronization signals to different directions through multiple radio frequency channels.
  • the user equipment can perform downlink synchronization signal detection through one or more radio frequency channels.
  • the above notification information may also include a radio frequency channel ID number.
  • FIG. 11 is a schematic diagram of a base station transmitting notification information through different radio frequency channels.
  • the base station After the downlink synchronization signal burst of each radio channel, the base station sends the notification information to the user equipment through the licensed frequency band.
  • the following is a description of the downlink synchronization signal sent by the base station through the radio frequency channel P0 and the radio frequency channel P1, and the user equipment is detected by using an RF channel, where the radio frequency channel P0 is used to send the synchronization signal block corresponding to B0 to B3 in the synchronization signal burst.
  • the RF channel P1 is used to transmit a synchronization signal block corresponding to B4 to B7 in the burst of the synchronization signal.
  • the base station detects that the channel corresponding to P0 is idle in the unlicensed frequency band, and the preemptive channel transmits the synchronization signal bursts #0B0 to B3.
  • the user equipment detects the synchronization signal bursts #0B0 to B3 transmitted through the radio frequency channel P0 and the synchronization signal bursts #0B4 to B7 transmitted through the radio frequency channel P1 in the unlicensed frequency band by using the receiving beam RX0, and detecting in the licensed frequency band.
  • the base station detects that the channel corresponding to P0 is idle in the unlicensed frequency band, and the preemptive channel transmits the synchronization signal bursts #1B0 to B3.
  • the licensed band sends notification information.
  • Information and notification information is sent through the licensed band. At this point, the complete sync signal burst #1 has been successfully transmitted, and the user equipment switches the receive beam and uses RX2 for detection in the next time window.
  • the base station uses similar steps to transmit respective synchronization signal bursts #2 and #3 on the radio frequency channels P0 and P1, respectively.
  • Embodiments of the transmitting method and the receiving method of the present application are described in detail above, and embodiments of the transmitting device and the receiving device of the present application will be further described below.
  • the transmitting device 200 can include a transceiver 21, a processor 22, and a memory 23, and the transceiver 21, the processor, and the memory are connected to one another via a bus 24.
  • the memory 23 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), an Erasable Programmable Read Only Memory (EPROM), or A Compact Read Read-Only Memory (CD-ROM) for transmitting related program and data, and transmitting program code and data of the device.
  • RAM random access memory
  • ROM read-only memory
  • EPROM Erasable Programmable Read Only Memory
  • CD-ROM Compact Read Read-Only Memory
  • Transceiver 21 can transmit data and/or signals, as well as receive data and/or signals.
  • the processor 22 may include one or more processors, for example, including one or more central processing units (CPUs).
  • CPUs central processing units
  • the CPU may be a single core CPU, or It is a multi-core CPU.
  • the processor 22 is configured to support the transmitting device to perform step 101 shown in FIG. 3, and generate notification information including a status indication indicating a transmission status of the downlink synchronization signal on the unlicensed frequency band.
  • the transceiver 21 is configured to support the sending device to perform step 102 shown in FIG. 3, and send the notification information by using the licensed frequency band.
  • Figure 12 only shows a simplified design of the transmitting device.
  • the transmitting device when it is a base station, it may also include other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, communication units, etc., and all of which may implement the present application.
  • the transmitting device is within the protection scope of the present application.
  • FIG. 13 is a schematic structural diagram of a receiving device according to an embodiment of the present application.
  • the receiving device 300 can include a transceiver 31, a processor 32, and a memory 33, and the transceiver 31, the processor, and the memory are connected to one another via a bus 34.
  • the memory 33 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), an Erasable Programmable Read Only Memory (EPROM), or A Compact Disc Read-Only Memory (CD-ROM) for receiving related program and data, and receiving program code and data of the device.
  • RAM random access memory
  • ROM read-only memory
  • EPROM Erasable Programmable Read Only Memory
  • CD-ROM Compact Disc Read-Only Memory
  • Transceiver 31 can transmit data and/or signals, as well as receive data and/or signals.
  • the processor 32 may include one or more processors, for example, including one or more central processing units (CPUs).
  • processors for example, including one or more central processing units (CPUs).
  • CPUs central processing units
  • the CPU may be a single core CPU, or It is a multi-core CPU.
  • the transceiver 31 is configured to support the receiving device to perform step 103 shown in FIG. 3, and detect and receive the notification information in the licensed frequency band, where the notification information includes a status indication indicating a transmission status of the downlink synchronization signal from the base station on the unlicensed frequency band.
  • the sending status is that the downlink synchronization signal is sent successfully or the sending fails.
  • the processor 32 is configured to support the receiving device to perform the step 104 shown in FIG. 3, for determining whether to switch the current receiving beam according to the notification information.
  • Figure 13 only shows a simplified design of the receiving device.
  • the receiving device when it is a user equipment, it may also include other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, communication units, etc., and all of which may implement the present application.
  • the receiving device is within the protection scope of the present application.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the computer program product includes the above computer program instructions, and when executed on a computer, causes the computer to execute the method of transmitting the downlink synchronization signal or the method of receiving the downlink synchronization signal.

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Abstract

本申请公开了一种下行同步信号的发送方法，包括：基站生成包含指示下行同步信号在非授权频段上的发送状态的状态指示的通知信息，所述发送状态为所述下行同步信号发送成功或者发送失败；基站通过授权频段发送所述通知信息。上述下行同步信号通过授权频段的辅助，能够提高非授权频段下行同步信号发送的效率。

Description

一种下行同步信号发送方法和接收方法及设备
本申请要求于2017年3月23日提交中国专利局、申请号为201710179375.2、申请名称为“一种下行同步信号发送方法和接收方法及设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术，特别涉及一种下行同步信号发送的方法和设备。
背景技术
随着移动通信对于数据传输速率、通信质量等要求不断提高，现有的用于移动通信的频段已经变得十分拥挤。然而，在高频频段(例如：6-300GHz)上，仍有大量的频谱资源还未被分配使用。因此，将高频频段引入至蜂窝接入通信，充分利用高频频段的大带宽资源，成为下一代5G(5-Generation)移动通信技术的重要研究方向之一。
高频频段的带宽资源非常丰富，其中有些带宽资源属于授权频段，需要付费获得授权才能使用；另一些带宽资源属于非授权频段，不需要获得授权就可以使用。为了更好地使用非授权频段，各个国家或者地区颁布了相应地法规以保证非授权频段的公平性以及性能。例如，先听后说(listen before talk，LBT)机制，LBT机制要求使用非授权频段的任何设备需要先对非授权频段进行检测，以确定非授权频段是否已被占用，如果非授权频段未被占用，那么设备就可以占用并进行数据传输，但是，在占用的非授权频段上占用的时长是有限制的，在占用的时长到达预定值时，其所占用的非授权频段将被释放，如果仍需要进行数据传输，则需要再次进行LBT以抢占资源。LBT机制对保证资源的公平使用，是非常有效的共享非授权频段的方法。
在5G通信系统中若使用非授权频段进行通信，也需要采用LBT机制。然而，若引入LBT机制，其会给5G通信系统的下行同步设计带来一定的影响，例如造成同步检测窗口不确定，从而影响用户设备接入5G通信系统的效率。因此，如何设计相应的机制来消除LBT机制对5G通信系统的影响称为亟待解决的问题。
发明内容
本申请实施例提供了一种下行同步信号的发送方法，以提出一种提高非授权频段下行信号发送效率的机制。
一方面，本申请的实施例提供一种下行同步信号的发送方法。该方法包括：基站生成包含指示下行同步信号在非授权频段上的发送状态的状态指示的通知信息，所述发送状态为所述下行同步信号发送成功或者发送失败；基站通过授权频段发送所述通知信息。
通过在授权频段发送包含指示下行同步信号在非授权频段上的发送状态的状态指 示的通知信息，使得用户设备或者非授权频段中下行同步信号是否发送成功，而避免在未接收到下行同步信号时切换当前接收波束。
在一种可能的设计中，基站在非授权频段发送下行同步信号之前进行信道侦听，当信道空闲时基站在非授权频段发送下行同步信号时，生成包含ACK消息的通知信息。在信道空闲时，下行同步信号能被成功发送，包含ACK消息的通知信息用于向用户设备指示下行同步信号已成功发送。
当信道不空闲时，基站未能在非授权频段发送下行同步信号，生成包含NACK消息的通知信息。在信道不空闲时，下行同步信号发送失败，包含NACK消息的通知信息用于向用户设备指示下行同步信号发送失败。
通过在授权频段发送包含下行同步信号发送成功与否的状态指示，能够避免用户设备对下行同步信号的遗漏。
在又一种可能的设计中，所述基站具有多个发送波束，所述多个发送波束被分成多个波束分组，所述下行同步信号为多个同步信号突发，每一所述波束分组具有一个波束分组ID且对应一个所述同步信号突发，所述通知信息还包括所述波束分组ID。
在又一种可能的设计中，当所述非授权频段具有多个分量载波时，所述通知信息还包括分量载波ID，所述分量载波ID用于指示所述下行同步信号的发送状态所对应的分量载波。
在又一种可能的设计中，当所述非授权频段通过多个射频通道发送同步信号时，所述通知信息还包括射频通道ID，所述射频通道ID用于指示所述下行同步信号的发送状态所对应的射频通道。
另一方面，本申请的实施例提供了一种发送设备，该发送设备具有实现上述下行同步信号的发送方法中基站行为的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一个可能的设计中，发送设备的结构中包括处理器和发射器，所述处理器被配置为支持基站执行上述下行同步信号发送方法中相应的功能。所述发射器用于支持发送设备与接收设备之间的通信，向接收设备发送上述通知信息。所述发送设备还可以包括存储器，所述存储器用于与处理器耦合，其保存发送设备必要的程序指令和数据。
又一方面，本申请的实施例提供一种下行同步信号的接收方法。方法包括：用户设备在授权频段检测并接收通知信息，所述通知信息包括指示来自基站的下行同步信号在非授权频段上的发送状态的状态指示，所述用户设备具有一个或多个接收波束；用户设备根据所述通知信息，确定是否切换当前的接收波束以进行非授权频段的下行同步信号的接收。
在一种可能的设计，所述用户设备根据所述通知信息，确定是否切换所述当前的接收波束以进行非授权频段的下行同步信号的接收包括：
当所述通知信息中包括ACK消息时，所述用户设备切换所述当前的接收波束以进行非授权频段的下行同步信号的接收。
如此，在当前接收波束已成功接收下行同步信号时，才进行接收波束的切换，以使下一接收波束开始下行同步信号的接收。
在又一种可能的设计，所述用户设备根据所述通知信息，确定是否切换切换所述 接收波束包括：
当所述通知信息中包括NACK消息时，所述用户设备继续采用所述当前的接收波束以进行非授权频段的下行同步信号的接收。
如此，在当前接收波束未成功接收下行同步信号时，不进行接收波束的切换，以避免当前接收波束遗漏下行同步信号。
另一方面，本申请的实施例提供了一种接收设备，该接收设备具有实现上述下行同步信号的发送方法中用户设备行为的功能，该接收设备具有多个接收波束。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
在一个可能的设计中，接收设备的结构中包括接收器和处理器，所述接收器用于支持接收设备与发送设备之间的通信，且被配置为在授权频段检测并接收上述通知信息。所述处理器被配置为支持接收设备执行上述下行同步信号发送方法中用户设备的相应的功能。所述接收设备还可以包括存储器，所述存储器用于与处理器耦合，其保存接收设备必要的程序指令和数据。
本申请的又一方面提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
本申请的又一方面提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍。显而易见地，下面附图中反映的仅仅是本申请的一部分实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得本申请的其他实施方式。而所有这些实施例或实施方式都在本申请的保护范围之内。
图1为本申请实施例的一种可能的应用场景示意图；
图2为本申请实施例的一种同步信号突发集合的示意图；
图3为本申请实施例的一种下行同步信号方法的流程示意图；
图4为本申请实施例的一种下行同步信号时间窗的示意图；
图5为本申请实施例中基于帧结构描述时间窗的示意图；
图6为本申请一实施例中通知信息的发送示意图；
图7为本申请另一实施例中通知信息的发送示意图；
图8为本申请又一实施例中通知信息的发送示意图；
图9为本申请又一实施例中通知信息的发送示意图；
图10为本申请又一实施例中通知信息的发送示意图；
图11为本申请又一实施例中通知信息的发送示意图；
图12为本申请一实施例中发送设备的简化结构示意图；
图13为本申请一实施例中接收设备的简化结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。
在本申请中，“示例性”一词用来表示“用作例子、例证或说明”。本申请被描述为“示例性”的任何实施例不一定被揭示为比其它实施例更优选或更具优势。为了使本领域任何技术人员能够实现和使用本申请，给出了以下描述。在以下描述中，为了解释的目的而列出了细节。应当明白的是，本领域普通技术人员可以认识到，在不使用这些特定细节的情况下也可以实现本申请。在其它实例中，不会对公知的结构和过程进行详细阐述，以避免不必要的细节使本申请的描述变得晦涩。因此，本申请并非旨在限于所示的实施例，而是与符合本申请所公开的原理和特征的最广范围相一致。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
本申请实施例可以应用于无线通信系统，所涉及无线通信系统包括但不限于：窄带物联网系统(英文：Narrow Band-Internet of Things，简称：NB-IoT)、全球移动通信系统(英文：Global System for Mobile Communications，简称：GSM)、增强型数据速率GSM演进系统(英文：Enhanced Data rate for GSM Evolution，简称：EDGE)、宽带码分多址系统(英文：Wideband Code Division Multiple Access，简称：WCDMA)、码分多址2000系统(英文：Code Division Multiple Access，简称：CDMA2000)、时分同步码分多址系统(英文：Time Division-Synchronization Code Division Multiple Access，简称：TD-SCDMA)，长期演进系统(英文：Long Term Evolution，简称：LTE)以及下一代5G移动通信系统的三大应用场景eMBB，URLLC和eMTC。
本申请实施例提及的发送设备可以是基站，基站是一种部署在无线接入网中为用户设备提供无线通信功能的装置。所述基站可以包括各种形式的宏基站，微基站(也称为小站)，中继站，接入点等。在采用不同的无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同，例如，在LTE系统中，称为演进的节点B(evolved NodeB，eNB或者eNodeB),在第三代(英文：3rd Generation，简称：3G)系统中，称为节点B(英文：Node B)等。为方便描述，本申请所有实施例中，上述为用户设备提供无线通信功能的装置统称为基站或BS。
本申请实施例中所涉及到的用户设备(user equipment，UE)可以包括各种具有无线通信功能的终端、手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备。所述MS终端也可以称为终端用户设备(英文：terminaluser equipment， UE)，还可以包括用户单元(英文：subscriber unit)、蜂窝电话(英文：cellular phone)、智能手机(英文：smart phone)、无线数据卡、个人数字助理(英文：Personal Digital Assistant，简称：PDA)电脑、平板型电脑、无线调制解调器(英文：modem)、手持设备(英文：handset)、膝上型电脑(英文：laptop computer)、机器类型通信(英文：Machine Type Communication,简称：MTC)终端等。为方便描述，本申请所有实施例中，上面提到的设备统称为用户设备。
下面以具体的实施例对本申请的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例中不再赘述。
首先对本文所涉及的若干个名词进行介绍。
授权频段(或称，许可频段)：是指在得到通信行业的管理部门许可后才能使用的频域资源。
非授权频段(或称，免许可频段)：是指在满足相关技术要求的前提下，不需要通信行业的管理部门的许可就能直接使用的频域资源，比如5GHz频段，运营商通过使用非授权频段传输信息可以实现网络容量的分流。
在授权辅助接入(Licensed Assisted Access，LAA)场景下，如图1所示。基站可以同时通过授权频段和非授权频段与用户设备进行数据通信。具体地，用户设备已经通过授权频段接入了无线通信系统，但同时用户设备还通过非授权频段进行数据通信，因此，需要进行非授权频段的下行同步过程。
作为5G新空口中下行同步信号传输的设计，下行同步信号被周期性发送，一个完整的周期对应一个同步信号突发(Synchronization Signal Burst，SSB)集合。其中，每一个同步信号突发集合包含多个同步信号突发，每一个同步信号突发中包含多个同步信号块，每一个同步信号块中包含主同步信号(Primary synchronization signal，PSS)和辅同步信号(Secondary synchronization signal，SSS)。用户设备在进行初始系统同步时，周期性地切换接收波束进行下行同步信号的检测。
请参看图2，为了便于说明，以下以基站具有L个发送波束，用户设备具有N个接收波束为例，进行进一步地说明。图2，为一个同步信号突发集合中包括N个同步信号突发，即一个同步信号突发集合中包括的同步信号与用户设备接收波束数量一致的同步信号突发，其中，每一同步信号突发对应用户设备的一个接收波束。一个同步信号突发中包括L个同步信号块，每一同步信号块对应基站的一个发送波束。从而，当基站将一个同步信号突发发送完时，基站的每一个发送波束均已发送同步信号块。当用户设备将一个同步信号突发接收完时，用户设备的一个接收波束可以接收到来自基站的L个发送波束的同步信号。如此，当基站将一个同步信号突发集发送完成时，用户设备的每个接收波束可以接收到分别来自基站的每个发送波束的同步信号。
可选地，在其他的实施方式中，同步信号突发集合中所包含的同步信号突发的数量也可以不等于用户设备接收波束的数量，提高同步信号突发设置的灵活度。
请参照图3，为本申请实施例所提出的一种下行同步信号发送方法的步骤流程图。
101，基站生成包含指示下行同步信号在非授权频段上的发送状态的状态指示的通知信息，所述发送状态为所述下行同步信号发送成功或者发送失败；
102，基站通过授权频段发送通知信息，该通知信息中包括所述下行同步信号的发送状态的状态指示信息。
103，用户设备接收通知信息。从而，用户设备可以通过该通知信息确定基站的下行同步信号是否发送成功。
104，用户设备根据通知信息，确定是否切换当前的接收波束，以进行非授权频段的下行同步信号的接收。
通过在授权频段发送包含指示下行同步信号在非授权频段上的发送状态的状态指示的通知信息，使得用户设备获得非授权频段中下行同步信号是否发送成功，提高了非授权频段下行同步的效率。
通常情况下，基站在预定的时间窗口发送下行同步信号以及通知信息，相应地，用户设备在对应的时间窗口检测下行同步信号以及通知信息。该预定的时间窗口可以为周期性地，或者是由特定事件所触发。在非授权频段需要竞争信道进行信号的发送，即存在竞争信道成功从而信号发送成功以及竞争信道失败从而信号发送失败的可能。在发送下行同步信号以后，基站可以获取自身发送下行同步信号是否成功。在步骤101中，基站生成包含指示下行同步信号在非授权频段上的发送状态的状态指示的通知信息。
为了便于描述，以下将基站发送下行同步信号的时间窗口称为“同步发送时间窗”，将基站发送通知信息的时间窗口称为“通知发送时间窗”，可以理解的是，上述同步发送时间窗可以包括或者不包括基站用于在非授权频段进行信道侦听的时间。另外，将用户设备检测下行同步信号的时间窗口称为“同步检测时间窗”，将用户设备检测通知信息的时间窗口称为“通知检测时间窗”。
示例性地，请参照图4，通知发送时间窗可以设置在同步发送时间窗之后，通知检测时间窗与通知发送时间窗对应设置。其中，通知检测时间窗的长度通常大于或者等于通知发送时间窗，从而保证用户设备在充分的时间检测通知信息。
非授权频段与授权频段通常会采用不同的帧结构，以下将基于帧结构来对时间窗进行说明。示例性地，请参照图5，授权频段采用60kHz的子载波间隔，在1个1ms的子帧(Subframe)中包含8个时隙(slot)。非授权频段采用480kHz的子载波间隔，在1个ms的子帧包含32个时隙。在调度周期为1个时隙时，用户设备在授权频段的1个子帧内可以调度8次，在非授权频段的1个子帧内可以调度32次。
以非授权频段的第一个下行同步信号突发在第k号子帧的第5号时隙发送为例，其对应授权频段第k号子帧的第1号时隙；第二个同步信号突发在第k+m个子帧的第5号时隙发送时，其对应授权频段第k+m号子帧的第1号时隙。则上述通知信息需在非授权频段的第k号子帧的第2号时隙和第k+m号子帧的第0号时隙之间发送。
可选地，上述通知检测时间窗的长度可以为5个时隙。例如，当该通知检测时间窗的起始位置为授权频段上第k个子帧的第3号时隙，则通知检测时间窗为授权频段上的第3至7号时隙。
以下，对上述通知信息的通知方式进行示例性地说明。
可选地，上述通知信息可以通过物理下行控制信道(Physical Downlink Control Channel，PDCCH)通知用户设备。例如，为该通知信息定义一个同步信号无线网络临时标识号 (Synchronization Signal Radio Network Temporary Identity，SS-RNTI)和下行控制信息(Downlink Control Information，DCI)格式。其中，SS-RNTI用于标识通知信息对应的用户设备，DCI用于承载上述通知信息。用户设备在通知检测时间窗通过RNTI在物理下行控制信道的公共搜索空间(Common Search Space，CSS)中进行检测。当检测到与SS-RNTI对应的DCI时，读取DCI信息以获取上述通知信息。
可选地，上述通知信息还可以通过媒体接入控制(Media Access Control，MAC)信令通知用户设备。具体地，该MAC信令中包含上述通知信息。用户设备在通知检测时间窗通过SS-RNTI在PDCCH的CSS中进行检测。当检测到与SS-RNTI对应的DCI时，读取DCI信息，其中DCI信息中包括MAC信令所在的资源分配信息，通过资源分配信息可以获得MAC信令，从而获得上述通知信息。
以下，将结合图6-图10，说明基站发送通知信息的不同设计方式。
在非授权频段下，基站需要先进行LBT，在信道为空闲时进行同步信号突发的发送。由于同步信号突发集合的一个发送周期的长度可能会大于LBT的最大占用时长，因此，在同步信号突发集合的一个发送周期内，可能会进行多次LBT。
实施例1：
基站采用N个同步发送时间窗在非授权频段发送下行同步信号突发。在每个同步发送时间窗，基站先进行信道侦听，以确定信道是否为空闲。只有在信道为空闲时，基站可以抢占到信道进行下行同步信号突发的发送。
请同时参照图6，以基站采用4个同步发送时间窗发送4个同步信号突发SSB#0、SSB#1、SSB#2、SSB#3为例进行说明，其中4个同步信号突发#0(SSB#0)、同步信号突发#1(SSB#1)、SSB#2(SSB#2)、SSB#3(SSB#3)中包含各个发送波束的信号，其区别在于编号不同。在第一个同步发送时间窗，基站在非授权频段侦听到信道为空闲，则抢占信道发送同步信号突发#0。在一些实施例中，同步信号突发#0发送成功，基站生成包含应答(acknowledgement，ACK)消息的通知信息，并在通知发送时间窗通过授权频段发送通知信息。当通知信息中仅包含ACK消息时，通知信息也可以理解为ACK消息本身。用户设备在同步检测时间窗内采用接收波束RX0在非授权频段检测下行同步信号，并接收到下行同步信号突发#0。用户设备在通知检测时间窗在授权频段检测到ACK消息后，切换为接收波束RX1，在下一同步检测时间窗口由接收波束RX1进行下行同步信号的检测。
在第二个同步发送时间窗，基站在非授权频段侦听到信道不为空闲，未能抢占到信道发送同步信号突发#1，此时，同步信号突发#1未成功发送。基站生成包含否定应答(negative acknowledgement，NACK)消息的通知信息，并在通知发送时间窗在授权频段上发送通知信息。当通知信息中仅包含NACK消息时，通知信息也可以理解为NACK消息本身。用户设备在同步检测时间窗采用接收波束RX1在非授权频段未能检测到下行同步信号，但是在通知检测时间窗在授权频段检测到包含NACK消息的通知信息后，不进行接收波束的切换，在下一同步检测时间窗继续由当前接收波束RX1进行下行同步信号的检测。
在第三个同步发送时间窗，基站在非授权频段侦听到信道为空闲，抢占信道发送下行同步信号。由于同步信号突发#1未被成功发送，则基站在第三个同步发送时间窗继续发送同步信号突发#1，同步信号突发#1成功发送。基站生成包含ACK消息的通知信息，并在 通知发送时间窗在授权频段发送包含ACK消息的通知信息。用户设备在同步检测时间窗在非授权频段采用接收波束RX1接受下行同步信号，并接收到同步信号突发#1；用户设备在通知检测时间窗在授权频段检测到包含ACK消息的通知信息后，切换为接收波束RX2，在下一同步检测时间窗由接收波束RX2进行下行同步信号的检测。
在第四个及第五个同步发送时间窗，基站抢占到信道分别发送下行同步信号突发#2与#3，其过程与第一同步发送时间窗类似，在此不再赘述。从而，基站完成发送波束的发送遍历，用户设备完成接收波束的接收遍历。用户设备的接收波束RX0～RX3分别成功接收包含基站各个发送波束同步信号的同步信号突发#0～#3，以完成与基站的同步。
实施例2：
在本实施例中，基站对通知信息的发送可以采用另一种设计方式。请参照图7，其与图6所示实施例的不同之处在于通知信息对同步信号发送状态的状态指示方式。以下，将针对两者的不同之处着重进行说明。
当基站在某一同步发送时间窗在非授权频段侦听到信道为空闲并抢占信道成功发送同步信号突发后，基站不发送通知信息并继续发送下一同步信号突发。相应地，用户设备在同步检测时间窗在非授权频段接收同步信号突发，在通知检测时间窗未接收到通知信息，则切换下一接收波束进行下行同步信号的检测。
当基站在某一同步时间窗在非授权频段侦听到信道不为空闲，未能成功发送下行同步信号时，基站生成包含NACK消息的通知信息，并在通知发送时间窗在授权频段向用户设备发送，在下一时间窗口继续发送当前同步信号突发。当通知信息中仅包含NACK消息时，通知信息也可以理解为NACK消息本身。相应地，用户设备在同步检测时间窗在非授权频段未接收到同步信号突发，在通知检测时间窗在授权频段接收包含NACK消息的通知信息，则不切换接收波束，继续采用当前的切换波束进行非授权频段的下行同步信号的接收。
可见，基站在某一同步发送时间窗在非授权频段成功发送同步信号突发，不生成通知信息，在下一同步发送时间窗发送另一同步信号突发；基站在某一同步发送时间窗在非授权频段未能发送同步信号突发，生成包含NACK消息的通知信息，在下一同步发送时间窗继续发送当前同步信号突发。用户设备在通知检测时间窗在授权频段未接收到通知信息时切换接收波束，用户设备在通知检测时间窗在授权频段接收到包含NACK消息的通知信息时不切换接收波束。
实施例3：
在本实施例中，基站对通知信息的发送还可以采用另一种设计方式。请参照图8，其与图7所示实施例的不同之处在于通知信息对同步信号发送状态的状态指示方式。以下，将针对两者的不同之处着重进行说明。
当基站在某一同步发送时间窗在非授权频段侦听到信道为空闲并抢占信道成功发送同步信号突发后，基站生成包含ACK消息的通知信息并在通知发送时间窗通过授权频段向用户设备发送。当通知信息中仅包含ACK消息时，通知信息也可以理解为ACK消息本身。相应地，用户设备在某一同步检测时间窗通过非授权频段接收同步信号突发，在通知检测时间窗接收到包含ACK消息的通知信息，则切换下一接收波束进行下行同步信号的 检测。
当基站在某一同步发送时间窗通过非授权频段侦听到信道不为空闲，未能成功发送下行同步信号时，基站不发送通知信息，在下一时间窗口继续发送同步信号突发。相应地，用户设备在同步检测时间窗在非授权频段未接收到同步信号突发，在通知检测时间窗未接收到通知信息，则不切换接收波束，继续使用当前的接收波束进行下行同步信号的接收。
可见，基站在某一同步发送时间窗在非授权频段成功发送同步信号突发时，生成包含ACK消息的通知信息并通过同步发送时间窗之后的通知发送时间窗发送；基站在某一同步发送时间窗在非授权频段未发送同步信号突发时，不发送通知信息。用户设备在通知检测时间窗接收到包含ACK消息的通知信息时进行接收波束的切换，在通知检测时间窗未接收到通知信息时不进行接收波束的切换。
实施例4：
在本实施例中，当一个同步信号突发中同步信号块的数量小于基站发送波束的数量时，需要多个同步信号突发才能完成基站所有发送波束的同步信号的发送。将基站发送波束进行分组，每一组的发送波束的数量可以小于或者等于一个同步信号突发中同步信号块的数量M，M为大于1的正整数。通知信息还包括波束分组ID，。如此，基站可以将发送波束分组进行发送。相应地，对于用户设备而言，用户设备的每个接收波束需要分别对基站各个发送波束组的同步信号突发的接收。
具体地，请参照图9，以发送波束B0～B7被划分为两个波束组#0、#1，用户设备接收的同步信号突发的数量为2(M＝2)为例进行说明。其中，波束组#0包括四个发送波束B0～B3，对应同步信号突发组0；波束组#1包括四个发送波束B4～B7，对应同步信号突发组1。即，基站完成一次发送波束的遍历需要两个同步信号突发，每一同步信号突发包括四个同步信号块，同步信号突发组0的ID为0，同步信号突发组1的ID为1。
如图9所示，基站在第一个同步发送时间窗在非授权频段侦听到信道为空闲，抢占信道发送同步信号突发#0组0。基站生成包含ACK消息和对应同步信号突发#0的波束分组ID＝0的通知信息，并在通知发送时间窗在授权频段发送通知信息。相应地，用户设备在同步检测时间窗在非授权频段采用接收波束RX0检测下行同步信号并接收通知信息，在通知检测时间窗在授权频段接收到波束分组ID＝0的ID以及ACK消息。此时，用户设备所接收的下行同步信号突发的数量小于2，继续采用接收波束RX0接收。
接着，基站在第二个同步发送时间窗发送同步信号突发#0组1。具体地，基站在第二个同步发送时间窗在非授权频段侦听信道为不空闲，则未能抢占到信道。同步信号突发#0组1发送失败，基站生成包含NACK消息和对应同步信号突发#0组1的波束分组ID＝1的通知信息，并在检测发送时间窗通过授权频段向用户设备发送通知信息。相应地，用户设备采用接收波束RX0在同步检测时间窗未检测到下行同步信号，在通知检测时间窗在授权频段接收到包含波束分组ID＝1的ID以及NACK消息的通知信息。此时，同步信号突发#0组1未能成功发送，用户设备所接收的下行同步信号突发的数量小于2，继续采用接收波束RX0进行接收。
然后，基站在第三个同步发送时间窗继续发送同步信号突发#0组1。基站在第三个同步发送时间窗在非授权频段侦听信道为空闲，抢占信道发送同步信号突发#0组1，基站生 成包含ACK消息和对应同步信号突发#0组1的波束分组ID＝1，并在之后的通知发送时间窗通过授权频段发送通知信息。相应地，用户设备采用接收波束RX0检测下行同步信号，并在同步检测时间窗在非授权频段接收到同步信号突发#0组1，在通知检测时间窗在授权频段接收到包含波束分组ID＝1以及ACK消息的通知信息。此时，用户设备的RX0接收到的下行同步信号突发的数量等于2，切换接收波束RX1接收。
采用类似的步骤，基站继续发送同步信号突发#1组0和同步信号突发#1组1，用户设备采用接收波束RX1检测下行同步信号。通过对基站发送波束分组来进行下行同步信号的发送，可以适应基站侧发送波束较多的场景。
实施例5：
在本实施例中，上述通知信息还包括分量载波ID号。针对非授权频段具有多个分量载波(Component Carrier，CC)的应用场景，多个分量载波需要发送下行同步信号。具体地，基站在非授权频段的多个分量载波上发送下行同步信号，用户设备在该多个分量载波上进行下行同步信号的检测。根据下行同步信号在非授权频段上的发送状态，基站通过授权频段发送包含各个分量载波上的下行同步信号发送状态的状态指示的通知信息给用户设备，用户设备在各个分量载波上分别检测通知信息。
如果在多个分量载波上发送同步信号，可以通过一条通知信息通知用户设备在多个分量载波上的下行同步信号突发是否发送成功。如果采用不同的配置发送多个分量载波上的同步信号，还可以通过多条通知信息分别通知用户设备在多个分量载波上的下行同步信号突发是否发送成功。
请参照图10，以下分别以采用不同配置的分量载波CC0和CC1为例进行说明，基站在各个分量载波的下行同步信号突发之后，通过授权频段向用户设备发送通知信息。
先以CC0为例，基站在CC0的第一个同步发送时间窗发送SSB。基站在非授权频段侦听到对应CC0的信道为空闲，抢占信道发送同步信号突发。基站生成包含ACK消息和分量载波ID＝CC0的通知信息，并在通知发送时间窗通过授权频段发送通知信息。相应地，用户设备采用接收波束RX0在同步检测时间窗在非授权频段的分量载波CC0上检测下行同步信号，并接收到同步信号突发#0，在通知检测时间窗在授权频段接收到包括包含分量载波的ID以及ACK消息的通知信息，用户设备切换接收波束为RX1。在CC0的第二个同步发送时间窗，对应CC0的信道为空闲，基站发送同步信号突发#1，用户设备设备接收同步信号突发#1并切换接收波束为RX2。
基站在CC0的第三同步发送时间窗发送同步信号突发#2。基站在非授权频段侦听到对应CC0的信道不为空闲，未能成功发送同步信号突发#2。基站生成包含分量载波ID＝CC0及NACK消息的通知信息，并在通知发送时间窗通过授权频段发送分通知信息。相应地，用户设备采用接收波束RX2在同步检测时间窗检测下行同步信号，未检测到同步信号突发#2，在通知检测时间窗在授权频段接收到包括分量载波的ID以及NACK消息的通知信息，用户设备不切换接收波束，继续使用当前接收波束RX2在下一时间窗口进行下行同步信号的检测。
在第四和第五同步发送时间窗，基站采用类似地步骤发送同步信号突发#2和#3，相应地，用户采用类似地步骤接收同步信号突发#2和#3。
然后以CC1为例，基站在CC1的第一同步发送时间窗发送同步信号突发#0。基站在非授权频段侦听到对应CC1的信道为空闲，抢占信道发送同步信号突发#0并生成包含分量载波的ID＝CC1以及ACK消息的通知信息，在通知发送时间窗通过授权频段发送通知信息。相应地，用户设备采用接收波束RX0在同步检测时间窗在非授权频段的分量载波CC1上检测下行同步信号，并接收到同步信号突发#0，在通知检测时间窗在授权频段接收到包括分量载波的ID以及ACK消息的通知信息，用户设备切换接收波束为RX1。
在CC1的第二同步发送时间窗，基站继续发送同步信号突发#1。基站在非授权频段侦听到对应CC1的信道不为空闲，未能成功发送同步信号突发#1。基站生成包含分量载波ID＝CC1及NACK消息，并在通知发送时间窗通过授权频段发送通知信息。相应地，用户设备在同步检测时间窗采用接收波束RX1检测下行同步信号，未能在非授权频段检测到同步信号突发#1，在授权频段接收到包括分量载波ID以及NACK消息的通知信息，用户设备不切换接收波束，继续使用当前接收波束RX1在下一时间窗口进行下行同步信号的检测。
在第三、第四和第五同步发送时间窗，基站采用类似地步骤发送同步信号突发#1、#2和#3，相应地，用户采用类似地步骤接收同步信号突发#1、#2和#3。可见，各个分量载波上进行信道侦听的结果不同，这是由于各个分量载波对应信道的状态不同或者是各个分量载波对应信道遭受干扰的情况不同。
实施例6：
在本实施例中，在通过多个射频通道发送同步信号的应用场景中，基站通过多个射频通道同时向不同的方向发送下行同步信号。相应地，用户设备可以通过一个或多个射频通道进行下行同步信号的检测。上述通知信息还可以包括射频通道ID号。
示例性地，请参照图11，为基站通过不同的射频通道发送通知信息的示意图。基站在各个射频通道的下行同步信号突发之后，通过授权频段向用户设备发送通知信息。以下以基站通过射频通道P0和射频通道P1发送下行同步信号，用户设备通过一个射频通道进行检测为例进行说明，其中射频通道P0用于发送同步信号突发中对应B0～B3的同步信号块，射频通道P1用于发送同步信号突发中对应B4～B7的同步信号块。
在第一个时间窗口，基站在非授权频段侦听到对应P0的信道为空闲，抢占信道发送同步信号突发#0B0～B3。同步信号突发#0B0～B3在非授权频段中P0对应的信道发送成功，基站生成包含射频通道的ID＝P0以及ACK消息的通知信息，并通过授权频段发送通知信息。同步信号突发#0B4～B7在非授权频段中P1对应的信道发送成功，基站生成ACK消息，并通过授权频段发送射频通道的ID＝P1以及ACK消息。相应地，用户设备采用接收波束RX0在非授权频段检测到通过射频通道P0发送的同步信号突发#0B0～B3以及通过射频通道P1发送的同步信号突发#0B4～B7，在授权频段检测到包含射频通道ID＝P0以及P0的ACK消息的通知信息，和包含射频通道ID＝P1以及P1的ACK消息的通知信息。由于此时完整的同步信号突发#0已被用户设备的接收波束RX0接收，用户设备切换接收波束为RX1，在下一时间窗口采用RX1进行检测。
在第二个时间窗口，基站侦听到在非授权频段中P0对应的信道为空闲，抢占信道发送同步信号突发#1B0～B3。同步信号突发#1B0～B3在非授权频段中P0对应的信道发送成功，基站生成包含射频通道的ID＝P0以及ACK消息，并通过授权频段发送通知信息。基 站侦听到在非授权频段中P1对应的信道不为空闲，未能抢占到信道发送同步信号突发#1B4～B7，基站生成包含射频通道的ID＝P1以及NACK消息的通知信息，并通过授权频段发送通知信息。相应地，用户设备采用接收波束RX1在非授权频段检测到射频通道P0发送的同步信号突发#1B0～B3，在授权频段检测到包含射频通道ID＝P0以及P0的ACK消息的通知信息，和包含射频通道ID＝P1以及P1的NACK消息的通知信息。由于此时射频通道P1对应的同步信号突发#1B4～B7未能成功接收，用户设备不切换接收波束，在下一个时间窗口继续采用RX1进行检测。
在第三个时间窗口，基站侦听到非授权频段中P0对应的信道不为空闲，未能抢占到信道发送同步信号突发#1B0～B3，基站生成包含射频通道ID＝P0以及NACK消息，并通过授权频段发送通知信息。基站侦听到非授权频段中P1对应的信道空闲，抢占信道继续发送在上一时间窗口未能成功发送的同步信号突发#1B4～B7，基站生成包含射频通道ID＝P1以及ACK消息的通知信息，并通过授权频段发送通知信息。此时完整的同步信号突发#1已成功发送，用户设备切换接收波束，在下一个时间窗口采用RX2进行检测。
类似地，在第四和第五个时间窗口，基站采用类似地步骤分别在射频通道P0和P1发送相应地同步信号突发#2和#3。
上面详细阐述了本申请的发送方法及接收方法的实施例，下面将继续阐述本申请的发送设备及接收设备的实施例。
请参阅图12，其为本申请实施例提供的一种发送设备可能的结构示意图。该发送设备200可以包括收发器21、处理器22和存储器23，收发器21、处理器和存储器通过总线24相互连接。
存储器23包括但不限于是随机存储记忆体(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable Read Only Memory，EPROM)、或便携式只读存储器(Compact Disc Read-Only Memory，CD-ROM)，该存储器23用于相关指令及数据，发送设备的程序代码和数据。
收发器21可以发送数据和/或信号，以及接收数据和/或信号。
处理器22可以包括一个或多个处理器，例如包括一个或多个中央处理器(Central Processing Unit，CPU)，在处理器22是一个CPU的情况下，该CPU可以是单核CPU，也可以是多核CPU。
处理器22用于支持发送设备执行图3所示步骤101，生成包含指示下行同步信号在非授权频段上的发送状态的状态指示的的通知信息。
收发器21用于支持发送设备执行图3所示步骤102，通过授权频段发送通知信息。
关于处理器22和收发器21执行的步骤，可以参见图4至图11对应实施例基站侧的具体描述，在此不再赘述。
可以理解的是，图12仅仅示出了发送设备的简化设计。在实际应用中，发送设备为基站时，其还可以分别包含必要的其他元件，包含但不限于任意数量的收发器、处理器、控制器、存储器、通信单元等，而所有可以实现本申请的发送设备都在本申请的保护范围之内。
请参阅图13，其为本申请实施例提供的一种接收设备可能的结构示意图。该接收设备300可以包括收发器31、处理器32和存储器33，收发器31、处理器和存储器通过总线34相互连接。
存储器33包括但不限于是随机存储记忆体(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable Read Only Memory，EPROM)、或便携式只读存储器(Compact Disc Read-Only Memory，CD-ROM)，该存储器33用于相关指令及数据，接收设备的程序代码和数据。
收发器31可以发送数据和/或信号，以及接收数据和/或信号。
处理器32可以包括一个或多个处理器，例如包括一个或多个中央处理器(Central Processing Unit，CPU)，在处理器32是一个CPU的情况下，该CPU可以是单核CPU，也可以是多核CPU。
收发器31用于支持接收设备执行图3所示步骤103，在授权频段对通知信息进行检测并接收，所述通知信息包括指示来自基站的下行同步信号在非授权频段上的发送状态的状态指示，所述发送状态为所述下行同步信号发送成功或者发送失败。
处理器32用于支持接收设备执行图3所示步骤104，用于根据通知信息确定是否切换当前的接收波束。
关于处理器31和收发器32执行的步骤，可以参见图4至图11对应实施例的用户设备侧的具体描述，在此不再赘述。
可以理解的是，图13仅仅示出了接收设备的简化设计。在实际应用中，接收设备为用户设备时，其还可以分别包含必要的其他元件，包含但不限于任意数量的收发器、处理器、控制器、存储器、通信单元等，而所有可以实现本申请的接收设备都在本申请的保护范围之内。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器 以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
上述计算机程序产品包含上述计算机程序指令，当其在计算机上运行时，使得计算机执行上述下行同步信号的发送方法或者上述下行同步信号的接收方法。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (26)

  1. 一种下行同步信号发送的方法，其特征在于，包括：
    基站生成包含指示下行同步信号在非授权频段上的发送状态的状态指示的通知信息，所述发送状态为所述下行同步信号发送成功或者发送失败；
    所述基站通过授权频段发送所述通知信息。
  2. 如权利要求1所述的方法，其特征在于，所述基站生成包含指示下行同步信号在非授权频段上的发送状态的状态指示的通知信息，包括：
    当基站在非授权频段发送下行同步信号时，生成包含ACK消息的通知信息。
  3. 如权利要求1或2所述的方法，其特征在于，所述基站生成包含指示下行同步信号在非授权频段上的发送状态的状态指示的通知信息，包括：
    当基站未在非授权频段发送下行同步信号时，生成包含NACK消息的通知信息。
  4. 如权利要求1到3任一项所述的方法，其特征在于，所述基站具有多个发送波束，所述多个发送波束被分成多个个波束分组，所述下行同步信号为多个同步信号突发，每一所述波束分组具有一个波束分组ID且对应一个所述同步信号突发，所述通知信息还包括所述波束分组ID。
  5. 如权利要求1到4任一项所述的方法，其特征在于，所述非授权频段具有多个分量载波，每一分量载波具有一个分量载波ID，所述通知信息还包括所述分量载波ID。
  6. 如权利要求1到4任一项所述的方法，其特征在于，所述非授权频段通过多个射频通道发送所述下行同步信号，每一射频通道具有一个射频通道ID，所述通知信息还包括所述射频通道ID。
  7. 一种下行同步信号的接收方法，应用于具有多个接收波束的用户设备，其特征在于，包括：
    用户设备在授权频段检测并接收通知信息，所述通知信息包括指示来自基站的下行同步信号在非授权频段上的发送状态的状态指示，所述发送状态为所述下行同步信号发送成功或者发送失败；
    用户设备根据所述通知信息，确定是否切换当前的接收波束以进行非授权频段的下行同步信号的接收。
  8. 如权利要求7所述的方法，其特征在于，所述用户设备根据所述通知信息，确定是否切换当前的接收波束以进行非授权频段的下行同步信号的接收包括：
    当所述通知信息中包括ACK消息时，所述用户设备切换所述当前的接收波束以进行非授权频段的下行同步信号的接收。
  9. 如权利要求7或8所述的方法，其特征在于，所述用户设备根据所述通知信息，确定是否切换当前的接收波束以进行非授权频段的下行同步信号的接收包括：
    当所述通知信息中包括NACK消息时，所述用户设备继续采用所述当前的接收波束以进行非授权频段的下行同步信号的接收。
  10. 一种发送设备，其特征在于，包括：
    处理器，用于生成包含下行同步信号在非授权频段上的发送状态的状态指示的通知信息，所述发送状态为所述下行同步信号发送成功或者发送失败；
    发射器，用于通过授权频段发送所述通知信息。
  11. 如权利要求10所述的发送设备，其特征在于，所述处理器，用于当所述发送设备抢占到信道在非授权频段下发送下行同步信号时，生成包含ACK消息的通知信息。
  12. 如权利要求10或11所述的发送设备，其特征在于，所述处理器，用于当所述发送设备未抢占到信道未在非授权频段发送下行同步信号时，生成包含NACK消息的通知信息。
  13. 如权利要求10到12任一项所述的发送设备，其特征在于，所述发送设备具有多个发送波束，所述多个发送波束被分成多个波束分组，所述下行同步信号为多个同步信号突发，每一所述波束分组具有一个波束分组ID且对应一个所述同步信号突发，所述通知信息还包括所述波束分组ID。
  14. 如权利要求10到13任一项所述的发送设备，其特征在于，所述非授权频段具有多个分量载波，每一分量载波具有一个分量载波ID，所述通知信息还包括所述分量载波ID。
  15. 如权利要求10到13任一项所述的发送设备，其特征在于，所述非授权频段通过多个射频通道发送所述下行同步信号，每一射频通道具有一个射频通道ID，所述通知信息还包括所述射频通道ID。
  16. 一种接收设备，所述接收设备具有多个接收波束，其特征在于，包括：
    接收器，用于在授权频段检测并接收通知信息，所述通知信息包括指示来自基站的下行同步信号在非授权频段上的发送状态的状态指示，所述发送状态为所述下行同步信号发送成功或者发送失败；
    处理器，用于根据所述通知信息，确定是否切换当前的接收波束以进行非授权频段的下行同步信号的接收。
  17. 如权利要求16所述的接收设备，其特征在于，所述一个或多个处理器用于当所述通知信息中包括ACK消息时，切换所述当前的接收波束以进行非授权频段的下行同步信号的接收。
  18. 如权利要求16或17所述的接收设备，其特征在于，所述一个或多个处理器用于当所述通知信息中包括NACK消息时，继续采用所述当前的接收波束以进行非授权频段的下行同步信号的接收。
  19. 一种发送设备，其应用于基站中，其特征在于，所述发送设备包括一个或多个处理器和存储器，所述存储器与所述一个或多个处理器耦合，所述一个或多个处理器用于执行如权利要求1-6中任意一项所述的方法。
  20. 一种发送设备，其应用于基站中，其特征在于，所述发送设备包括一个或多个处理器，所述一个或多个处理器与存储器耦合，读取所述存储器中的指令并根据所述指令执行如权利要求1-6任意一项所述的方法。
  21. 一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行如权利要求1-6任意一项所述的方法。
  22. 一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行如权利要求1-6任意一项所述的方法。
  23. 一种接收设备，其应用与用户设备中，其特征在于，所述接收设备包括一个或多个处理器和存储器，所述存储器与所述一个或多个处理器耦合，所述一个或多个处理器用于执行如权利要求7-9中任意一项所述的方法。
  24. 一种接收设备，其应用于用户设备中，其特征在于，所述接收设备包括一个或多个处理器，所述一个或多个处理器与存储器耦合，读取所述存储器中的指令并根据所述指令执行如权利要求7-9任意一项所述的方法。
  25. 一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行如权利要求7-9任意一项所述的方法。
  26. 一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行如权利要求7-9任意一项所述的方法。
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