WO2018218545A1 - 一种发现信号的发送方法、检测方法、基站和用户设备 - Google Patents

一种发现信号的发送方法、检测方法、基站和用户设备 Download PDF

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Publication number
WO2018218545A1
WO2018218545A1 PCT/CN2017/086717 CN2017086717W WO2018218545A1 WO 2018218545 A1 WO2018218545 A1 WO 2018218545A1 CN 2017086717 W CN2017086717 W CN 2017086717W WO 2018218545 A1 WO2018218545 A1 WO 2018218545A1
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Prior art keywords
subframes
subframe
equal
dmtc window
less
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PCT/CN2017/086717
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English (en)
French (fr)
Inventor
任占阳
张武荣
李振宇
韩金侠
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2017/086717 priority Critical patent/WO2018218545A1/zh
Priority to CN201780090489.8A priority patent/CN110622591A/zh
Priority to AU2017416331A priority patent/AU2017416331A1/en
Priority to EP17911494.7A priority patent/EP3614761A4/en
Publication of WO2018218545A1 publication Critical patent/WO2018218545A1/zh
Priority to US16/697,875 priority patent/US20200100093A1/en

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    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • 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
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows

Definitions

  • the present application relates to the field of communications, and in particular, to a method, a method for detecting a discovery signal, a base station, and a user equipment.
  • the user equipment In the MF (MulteFire) system, the user equipment (User Equipment, UE) completes the network access process by receiving a discovery signal (DRS) of the base station equipment.
  • DRS discovery signal
  • the base station can only send a discovery signal to multiple UEs through one subframe, and the signal includes a primary synchronization signal (PSS), a MF primary synchronization signal (MF-PSS), and a secondary synchronization signal.
  • PSS primary synchronization signal
  • MF-PSS MF primary synchronization signal
  • secondary synchronization signal secondary synchronization signal
  • SSS secondary synchronization signal
  • MF-SSS MF-secondary synchronization signal
  • MF-PBCH MF physical broadcast channel
  • the UE receives the DRS and parses the PSS, the MF-PSS, the SSS, and the MF-SSS to obtain a physical cell ID (PCI), parses the MF-PBCH to obtain information such as system bandwidth, and completes synchronization with the base station clock and frequency.
  • the DRS is transmitted in one subframe and occupies 12 or 14 orthogonal frequency division multiplexing (OFDM) symbols, wherein PSS, SSS, MF-PSS, and MF-SSS occupy 1 symbol respectively.
  • the MF-PBCH occupies 6 orthogonal frequency division multiplexing (OFDM) symbols.
  • the user equipment When the MF system is deployed in a scenario such as a port, a dock, or an automated production stream, the user equipment generally has a high mobility. During the movement of the user equipment, the wireless signal transmitted by the base station is easily separated by the user equipment and the base station. The object is occluded, resulting in poor quality of the wireless signal, and the user equipment may not receive it normally. On the other hand, due to the large number of user equipments, it is easy to block the wireless signal during the movement process, and the user equipment may also The data sent by the base station cannot be received normally. At this time, there is a high demand for the signal quality delivered by the base station, and the base station needs to provide better wireless coverage capability to cope with the scenario where the wireless signal quality is poor.
  • the DRS is transmitted in one subframe.
  • the DRS may not be received normally. Therefore, the UE cannot obtain the synchronization signal and the MF-PBCH information, so that it cannot synchronize with the base station clock and frequency, and cannot obtain system information, and thus cannot access the core network through the base station.
  • the embodiment of the present invention provides a method for transmitting a discovery signal, a detection method, a base station, and a user equipment, and the measurement configuration of the new discovery signal is used to support the transmission of the enhanced discovery signal to enable the UE to access in a weak coverage scenario. Coverage performance of the cell.
  • a method for transmitting a discovery signal including: performing, by a base station, first carrier sensing on a first R subframes of a radio frame in a time of a first discovery signal measurement timing (DMTC) window; If the first carrier is successfully detected, the base station sends the M consecutive subframes.
  • Sending a discovery signal M is greater than or equal to 2; the first subframe of the M consecutive subframes is located in one radio frame in the first DMTC window; wherein, the first DMTC window includes N subframes, and M, N, and R are both For natural numbers.
  • the first carrier sensing success may be performed by performing the first carrier sensing success before the first subframe, and determining that the channel is idle.
  • the embodiment of the present application may divide a radio frame in the first DMTC window into two parts, and may try to perform the first carrier sensing from the first subframe, that is, before the subframe 0, if the first R subframes range
  • the first carrier sensing is performed successfully, and the discovery signal can be sent in multiple consecutive subframes.
  • the present application can measure the timing configuration by using a new discovery signal.
  • the enhanced discovery signal transmission is supported to enable the UE to access in a weak coverage scenario to improve cell coverage performance.
  • the first DMTC window contains N subframes; if N is less than or equal to 11-M, then R is less than or equal to N; or, if N is greater than 11-M, then R is less than or equal to 11-M . That is to say, in a radio frame in the DMTC, at most 11-M subframes can be used to perform the first carrier sensing, and since the discovery signal occupies M subframes, thus, M consecutive subframes can be made in one wireless. Within the frame, there is no conflict with the format of the discovery signal specified by the existing DMTC out-of-frame subframe 0 position.
  • the discovery signals carried on each of the M consecutive subframes may be the same or different.
  • the M consecutive subframes may be a plurality of DRSs that are repeatedly transmitted, that is, an enhanced DRS, or may be a newly defined Enhanced Discovery Signal (eDRS).
  • the core difference between the eDRS and the DRS is that the number of subframes occupied by the eDRS is different from the number of subframes occupied by the DRS.
  • the DRS occupies one subframe, and the eDRS can occupy multiple subframes.
  • the first DMTC window includes N subframes, and the first Q subframes of the M consecutive subframes carry the subframe number, and Q is less than or equal to M; wherein, if N is less than or equal to 11-Q, Then R is less than or equal to N; or, if N is greater than 11-Q, then R is less than or equal to 11-Q. That is, within one radio frame in the first DTMC window, up to 11-Q subframes may be used to perform first carrier sensing. Since the first Q subframes of the M consecutive subframes carry the subframe number, the UE can determine the format of the found signal on the M consecutive subframes sent by the base station according to the subframe number of the previous Q subframes.
  • the base station determines the format of the discovery signal on the M consecutive subframes according to the subframe number of the previous Q subframes.
  • the base station performs second carrier sensing on a subframe other than the first R subframes in time series for one radio frame in the first DMTC window, or the base station Performing second carrier sensing for a subframe other than the first R subframes in the first DMTC window. That is, if the first carrier sensing failure is performed in the first R subframes, the second carrier sensing may be performed from the first subframe other than the R subframes in one radio frame.
  • the first carrier sensing is configured to send the eDRS.
  • the first carrier sensing success requires that the channel idle time is not shorter than the time when the second carrier sensing success requires the channel to be idle.
  • the first carrier sensing may be applicable to the transmission of the eDRS occupying more than one subframe, and the second carrier sensing may be applicable to the transmission of the DRS occupying no more than one subframe.
  • the first DMTC window includes N subframes; if N is less than or equal to 11-Q, the starting subframes in the M consecutive subframes are in N subframes; or, if N is greater than 11 -Q, then the starting subframe in the M consecutive subframes is in the first 11-Q subframes in one radio frame.
  • the subframe carries the subframe number. That is, up to 11-Q subframes may be used to perform first carrier sensing.
  • the first DMTC window contains one or more radio frames, or a portion of a radio frame.
  • a discovery signal detection method is provided.
  • the user equipment UE detects a discovery signal in the first R subframes of one radio frame in the first discovery signal measurement timing DMTC window, and finds that the signal is carried on M consecutive subframes. M is greater than or equal to 2; wherein the first subframe of the M consecutive subframes is located in one radio frame in the first DMTC window, and both M and R are natural numbers. That is, for the UE, the UE considers that the base station starts to transmit the discovery signal in the first R subframes in one radio frame of the first DMTC window, and only needs to detect whether to start receiving the discovery signal in the first R subframes.
  • the first DMTC window contains N subframes; if N is less than or equal to 11-M, then R is less than or equal to N; or, if N is greater than 11-M, then R is less than or equal to 11-M . That is, the range of the first R subframes is determined according to the number of subframes occupied by the first DMTC window and the number of subframes carrying the discovery signal, so that the subframe occupied by the discovery signal is within one radio frame, It will conflict with the format of the discovery signal specified by the first DMTC out-of-frame subframe 0 position.
  • the first DMTC window includes N subframes; wherein the first Q subframes of the M consecutive subframes carry the subframe number, and Q is less than or equal to M; wherein, if N is less than or equal to 11- Q, then R is less than or equal to N; or, if N is greater than 11-Q, then R is less than or equal to 11-Q.
  • the UE determines the format of the M consecutive subframes according to the subframe numbers of the previous Q subframes. That is, even if M consecutive subframes belong to multiple radio frames, the UE may determine the format of M consecutive subframes according to the subframe numbers of the previous Q subframes.
  • a base station including a receiving module, a transmitting module, and a processing module.
  • a receiving module configured to perform a first carrier sensing on a first R subframes of a radio frame in a timing of a first discovery signal measurement timing DMTC window
  • a processing module configured to determine whether the first carrier sensing is successful, if the first The carrier sensing is successful
  • the sending module is configured to send the discovery signal on M consecutive subframes, where M is greater than or equal to 2, and the first subframe of the M consecutive subframes is located in a radio frame in the first DMTC window, where , M and R are natural numbers.
  • the first DMTC window includes N subframes; wherein, if N is less than or equal to 11-M, then R is less than or equal to N; or, if N is greater than 11-M, then R is less than or equal to 11 -M.
  • the discovery signals carried on each of the M consecutive subframes may be the same or different.
  • the first Q subframes in the M consecutive subframes carry the subframe number, and Q is less than or equal to M; wherein, if N is less than or equal to 11-Q, R is less than or equal to N; or If N is greater than 11-Q, then R is less than or equal to 11-Q.
  • the processing module is configured to determine a format of the discovery signal on the M consecutive subframes according to the subframe number carried by the previous Q subframes.
  • the receiving module is configured to perform second carrier detection on the subframes other than the first R subframes in time series for one radio frame in the first DMTC window. Listening, or performing second carrier sensing for subframes other than the first R subframes in the first DMTC window.
  • the transmitting module transmits a discovery signal on one subframe in the first DMTC window.
  • the first DMTC window contains N subframes; if N is less than or equal to 11-Q, then The starting subframe in the M consecutive subframes is in N subframes; or, if N is greater than 11-Q, the starting subframes in the M consecutive subframes are in front of one radio frame in the first DMTC window Among the 11-Q subframes, the first Q subframes of the M consecutive subframes carry the subframe number.
  • the first DMTC window contains one or more radio frames, or a portion of a radio frame.
  • a user equipment UE including a receiving module, configured to detect a discovery signal in a first R subframes of a radio frame in a first discovery signal measurement timing DMTC window, and find that the signal is carried in M consecutive subframes. Up, M is greater than or equal to 2; the first subframe of the M consecutive subframes is located in one radio frame in the first DMTC window, and both M and R are natural numbers.
  • the first DMTC window contains N subframes; if N is less than or equal to 11-M, then R is less than or equal to N; or, if N is greater than 11-M, then R is less than or equal to 11-M .
  • the receiving module is also configured to receive a discovery signal.
  • the UE further includes a processing module, configured to determine a format of the M consecutive subframes according to the subframe numbers of the previous Q subframes.
  • the first DMTC window includes N subframes; the first Q subframes of the M consecutive subframes carry the subframe number, and Q is less than or equal to M; wherein, if N is less than or equal to 11-Q, Then R is less than or equal to N; or, if N is greater than 11-Q, then R is less than or equal to 11-Q.
  • the UE determines the format of M consecutive subframes according to the subframe numbers of the previous Q subframes.
  • a base station comprising: a receiver, a transmitter and a processor, the receiver, configured to perform a first carrier in a first R subframes of a radio frame in a timing DMTC window for the first discovery signal measurement timing Listening; if the first carrier is successfully detected, the transmitter is configured to send a discovery signal on M consecutive subframes, M is greater than or equal to 2; the first subframe of the M consecutive subframes is located in the first DMTC window In a radio frame, where M and R are both natural numbers.
  • the first DMTC window includes N subframes, if N is less than or equal to 11-M, then R is less than or equal to N; or, if N is greater than 11-M, then R is less than or equal to 11-M .
  • the discovery signals carried on each of the M consecutive subframes may be the same or different.
  • the first DMTC window includes N subframes; the first Q subframes of the M consecutive subframes carry the subframe number, Q is less than or equal to M; if N is less than or equal to 11-Q, then R Less than or equal to N; or, if N is greater than 11-Q, then R is less than or equal to 11-Q.
  • the processor before the transmitter is configured to send the discovery signal, the processor is configured to determine the format of the discovery signal on the M consecutive subframes according to the subframe number carried by the previous Q subframes.
  • the receiver if the first carrier sense fails, the receiver is configured to perform second carrier sensing on a subframe other than the first R subframes in time series for one radio frame in the first DMTC window. Or the base station performs second carrier sensing for subframes other than the first R subframes in the first DMTC window.
  • the transmitter is configured to transmit a discovery signal on one of the first DMTC windows.
  • the first DMTC window includes N subframes; if N is less than or equal to 11-Q, the starting subframes in the M consecutive subframes are in N subframes; or, if N is greater than 11 -Q, then the starting subframe in the M consecutive subframes is in the first 11-Q subframes in one radio frame, wherein the first Q sub-frames in the M consecutive subframes
  • the frame carries the subframe number.
  • the first DMTC window contains one or more radio frames, or a portion of a radio frame.
  • a user equipment including a receiver and a transmitter, configured to detect a discovery signal in a first R subframes of a radio frame of a first discovery signal measurement timing DMTC window; wherein the discovery signal It is carried on M consecutive subframes, M is greater than or equal to 2; the first subframe of M consecutive subframes is located in one radio frame in the first DMTC window, and M and R are both natural numbers.
  • the first DMTC window contains N subframes; if N is less than or equal to 11-M, then R is less than or equal to N; or, if N is greater than 11-M, then R is less than or equal to 11-M .
  • the first DMTC window includes N subframes; the first Q subframes of the M consecutive subframes carry the subframe number, and Q is less than or equal to M; wherein, if N is less than or equal to 11-Q, Then R is less than or equal to N; or, if N is greater than 11-Q, then R is less than or equal to 11-Q.
  • the receiver is configured to receive the discovery signal, and further includes a processor, where the processor is configured to determine M consecutive subframes according to the subframe number of the first Q subframes before the transmitter is configured to send the discovery signal.
  • the format of the discovery signal is configured to determine M consecutive subframes according to the subframe number of the first Q subframes before the transmitter is configured to send the discovery signal.
  • an embodiment of the present application provides a computer storage medium, which is implemented by a processor to implement any of the possible methods in the base station and/or user equipment.
  • embodiments of the present application provide a computer program product that, when run on a computer, causes the computer to perform a method in any of the possible designs of the base station and/or user equipment as described above.
  • An embodiment of the present application provides a method for sending a discovery signal, a detection method, a base station, and a user equipment, where the base station performs first carrier sensing on a first R subframes of a radio frame in a timing in a first discovery signal measurement timing DMTC window. If the first carrier is successfully detected, the base station sends a discovery signal on M consecutive subframes, where M is greater than or equal to 2, and the first subframe of the M consecutive subframes is located in a radio frame in the first DMTC window.
  • M and R are both natural numbers.
  • the embodiment of the present application may divide a radio frame in the first DMTC window into two parts, and may try to perform the first carrier sensing from the first subframe, that is, before the subframe 0, if the first R subframes If the first carrier is successfully detected in the range, the discovery signal can be sent on multiple consecutive subframes. Compared with the discovery signal DRS in the prior art, the subframe is occupied by one subframe.
  • the present application measures the timing configuration by using a new discovery signal.
  • the enhanced discovery signal transmission is supported to enable the UE to access in a weak coverage scenario to improve cell coverage performance.
  • FIG. 1 is a schematic diagram of a scenario in which an MF base station and a wireless-fidelity (wifi) coexistence based on an unlicensed frequency deployment according to an embodiment of the present application;
  • FIG. 2 is a schematic diagram of signal fading due to occlusion according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of configuration parameters of a DMTC window for transmitting a DRS according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of a format of an eDRS according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a format of an eDRS according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of occupying a subframe when an eDRS is sent in a DMTC window according to an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of a subframe in which an eDRS is transmitted beyond a DMTC window according to an embodiment of the present disclosure
  • FIG. 8 is a schematic flowchart diagram of a DMTC configuration method according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic diagram of three possible formats of an eDRS according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of attempting to perform a Cat. 4 LBT and attempting to perform a Cat. 2 LBT in a DMTC window according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of performing an attempt to execute a Cat. 4 LBT and attempting to perform a Cat. 2 LBT when adding a DMTC window according to an embodiment of the present application;
  • FIG. 11 is a schematic structural diagram of a base station according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.
  • Listening-Before-Talk is a method of listening before sending. It means that each network element needs to perform LBT before transmitting data, that is, it can send data after detecting that the channel is idle, and each time After the channel is preempted, it can only be sent for a limited duration.
  • the base station can use two types of LBTs to listen to signals before transmitting data, for example, channel idle evaluation based on random backoff and channel idle evaluation based on random backoff, specifically Cat.2 LBT And Cat.4 LBT as an example.
  • Cat.2 LBT refers to a Clear Channel Assessment (CCA) that is not based on random backoff.
  • CCA Clear Channel Assessment
  • the channel may be intercepted at the transmitting node. If the channel is idle within 25 us, the transmitting node may immediately occupy the channel. The channel performs data transmission.
  • the Cat.4 LBT is a random back-off based CCA.
  • the required listening duration needs to be randomized. Specifically, the sending node randomly generates a random back from 0 to the Contention Window Size (CWS).
  • CWS Contention Window Size
  • the counter N is returned, and the listening time slot (CCA slot) is used as the granularity for listening. If the channel is idle in the listening time slot, the backoff counter is decremented by one, and if the channel is busy, the back counter is returned. Suspended, that is, the backoff counter N remains unchanged during the channel busy time until the channel is detected to be idle; when the backoff counter is decremented to 0, the transmitting node can immediately occupy the channel.
  • CCA slot Contention Window Size
  • the base station needs to detect at least the channel idle time within the defer duration time before the backoff counter.
  • the calculation formula of Defer duration is (16+9*m p ), and the value of m p can be based on the priority class as shown in Table 1 below.
  • the base station initializes the time required for the channel to be idle according to the priority level used before transmitting the data. Generally, the higher the priority level, the shorter the time required for the channel to be idle, but the shorter the time that the data can be transmitted.
  • CW min,p represents the minimum value of the contention window length
  • CW max,p represents the maximum value of the contention window length
  • CW p represents the value of the allowed contention window length.
  • the criterion for determining the channel state is: the wireless communication device compares the power on the received channel in the listening time slot with the energy detection threshold. If the threshold is higher than the threshold, the channel state is busy, if the threshold is lower, the channel state is The channel is idle.
  • the Discovery Signal Measurement Timing is used to indicate the opportunity to send a discovery signal according to the configuration parameters.
  • the configuration parameters may include the period of the DMTC (dmtc-Periodicity-mf), the sub-cycle of the DMTC window (window). The starting position of the frame (dmtc-Offset-mf) and the length of the DMTC window (dmtc-WindowSize-mf).
  • the DRS is used by the UE to complete the network access process by receiving the DRS of the base station device.
  • the configuration parameter of the DMTC corresponding to the DRS for example, if the dmtc-Periodicity-mf is configured to be 40 ms, the dmtc-Offset-mf is configured to be 0, and the dmtc-WindowSize-mf is configured to be 10 ms,
  • the start position of the subframe of the DMTC window is subframe 0, that is, subframe 0 of the radio frame, and each radio frame includes 10 subframes.
  • the period of the DMTC is 40 ms, and the length of the DMTC window in the period is 10 ms, that is, subframe 0 to subframe 9, as shown in FIG.
  • the base station performs the channel interception of the Cat.2 LBT in the first 25us before the start of the subframe 0 in the DMTC window according to the configuration parameters of the DMTC, that is, the subframe 0 to the subframe 9, if the channel is detected within 25 us.
  • the base station sends DRS. If the Cat.2 LBT fails, that is, the channel is not always idle in 25us, the base station can continue to perform Cat.2 in the first 25us before the start of the next subframe 1.
  • the LBT performs channel sounding, and if the base station performs the Cat. 2 LBT success before a certain subframe, the DRS is transmitted in the subframe.
  • the network architecture and the service scenario described in this application are for the purpose of more clearly explaining the technical solutions of the present application, and do not constitute a limitation on the technical solutions provided by the present application. Those skilled in the art may know that with the evolution of the network architecture and new services. The appearance of the scenario, the technical solution provided by the present application is equally applicable to similar technical problems.
  • the present application can be applied to the Long Term Evolution (LTE) broadband system or the MulteFire (MF) system to find enhancement of signals at unlicensed frequency points.
  • LTE Long Term Evolution
  • MF MulteFire
  • One of the features of Unlicensed frequency is that it allows different units and individuals, systems of different standards to use the same frequency point.
  • the unlicensed frequency is mainly used by the wifi system, and one of the scenarios in which the MF base station and the wifi based on the unlicensed frequency point coexist can be as shown in FIG. 1 .
  • the MF system can be deployed independently at unlicensed frequency, and can be adapted to intelligent operations such as enterprises, factories, workshops and warehouses. However, in these independently deployed scenarios, there are some requirements that require deep coverage, such as Automated Guided Vehicle (AGV).
  • AGV Automated Guided Vehicle
  • the control of the car, when there is a container blockage between the car or the column is blocked, the signal fading is serious, and the coverage enhancement is needed at this time
  • the network architecture of the present application may include a base station device and a user equipment.
  • a base station (BS) device also referred to as a base station, is a device deployed in a wireless access network to provide wireless communication functions.
  • a device that provides a base station function in a 2G network includes a base transceiver station (BTS) and a base station controller (BSC), and a device that provides a base station function in a 3G network includes a Node B (NodeB) and a wireless device.
  • a network controller which provides a base station function in a 4G network, includes an evolved Node B (base station), and a device that provides a base station function in a Wireless Local Area Networks (WLAN). It is an Access Point (AP).
  • the devices providing the functions of the base station include a New Radio NodeB (gNB), a Centralized Unit (CU), a Distributed Unit, and a new wireless controller.
  • the user equipment UE is a terminal device, which may be a mobile terminal device or a non-mobile terminal device.
  • the terminal device is mainly used for receiving or transmitting service data.
  • User equipment can be distributed in the network.
  • User equipments have different names in different networks, such as: terminals, mobile stations, subscriber units, stations, cellular phones, personal digital assistants, wireless modems, wireless communication devices, handheld devices, knees. Upper computer, cordless phone, wireless local loop station, etc.
  • the user equipment can communicate with one or more core networks via a radio access network (RAN) (access portion of the wireless communication network), such as exchanging voice and/or data with the radio access network.
  • RAN radio access network
  • the power is shared among multiple users, and the downlink user cannot transmit data at full power.
  • the coverage enhancement design of the downlink channel in this scenario is required.
  • another discovery signal that is, an enhanced discovery signal (eDRS)
  • eDRS enhanced discovery signal
  • the core difference between the eDRS and the DRS is that the number of subframes occupied by the eDRS is different from the number of subframes occupied by the DRS.
  • the DRS occupies one subframe, and the eDRS can occupy multiple subframes, so that the probability of the downlink user receiving the discovery signal increases.
  • Improve cell coverage performance The base station in the embodiment of the present application can send an eDRS to ensure coverage performance of the cell.
  • eDRS occupies multiple subframes in the time domain.
  • the first possible format is: eDRS occupies a subframe, the first subframe contains or is compatible with the existing DRS, and the remaining subframes except the first subframe also include the DRS, but the first subframe and the other subframes contain the DRS.
  • the synchronization signal and the broadcast channel are different (may be partially identical), and the time domain resource location, signal format, and channel format are the same. Taking eDRS as occupying 3 subframes as an example, the format of the eDRS can be as shown in FIG. 4 .
  • the second possible format is: eDRS occupies a subframe, except that the first subframe contains or is compatible with the existing DRS, and the other subframes are newly defined DRSs, which do not include the existing DRS, but may include the existing DRS. Part of the content, such as including partial sync signals and broadcast channels.
  • the eDRS occupies 3 subframes, and the format of the eDRS can be as shown in FIG. 5.
  • eDRS occupies multiple subframes in the time domain, taking 5 subframes as an example.
  • the first subframe of the eDRS includes DRS, which is compatible with existing terminal devices, and is recorded as 1.0DRS.
  • 1.0 is the standard version number of the MF, and the case of the subsequent 4 subframes may be, for example, the 2nd to 4th subframes are newly defined DRSs of the eDRS, denoted as 1.1DRS, and the 5th subframe is 1.0DRS; or the 2nd child Frame, 3rd subframe, and 5th subframe For 1.1DRS, the 4th subframe is 1.0DRS.
  • the eDRS occupies multiple subframes in the time domain, and takes 5 subframes as an example, as shown in FIG. 6.
  • the first subframe of the eDRS includes the DRS, which is 1.0 DRS, and the subsequent 4 subframes are newly defined DRSs of the eDRS, which are recorded as 1.1 DRS, and the terminal for the MF 1.1 receives the eDRS. Since the eDRS includes multiple subframes, the base station can no longer perform the Cat. 2LBT for channel sensing during DRS transmission, and the first carrier sensing can be performed.
  • the first carrier sensing can be Cat.4LBT, and the channel required for performing the Cat. 4LBT success is required.
  • the idle time is not shorter than the time required to perform the Cat.2LBT success.
  • the base station performs Cat.4LBT before the first subframe 0 in the DMTC window, that is, if the execution of the Cat.4LBT is successful, the subframe 0 starts from the subframe 0.
  • the eDRS is transmitted to the subframe 4, and if the execution of the Cat.4 LBT is unsuccessful, the execution of the Cat.4 LBT is continued until the next subframe until the success, to transmit the eDRS. If the base station fails to perform the Cat.4 LBT from subframe 0 to subframe 5, the Cat.4 LBT can only be executed from before the subframe 6.
  • the eDRS is sent. At this time, the last subframe occupied by the eDRS exceeds the DMTC window and is 1.1DRS, as shown in FIG. 7, but the existing standard (MulteFire Release 1.0) specifies any subframe other than the DMTC window. If it is a downlink subframe, the eNB must transmit the existing DRS, that is, 1.0 DRS. In this case, the eDRS needs to define multiple formats according to the location of the starting subframe. The UE needs to know the specific format of the received eDRS for demodulation. Otherwise, the UE needs to try every possible format to blindly check the eDRS, which may cause excessive complexity.
  • the present application provides a method for transmitting and detecting a discovery signal, which can improve cell coverage performance.
  • Step 801 The base station performs first carrier sensing on the first R subframes in the timing of one radio frame in the first discovery signal measurement timing DMTC window. According to the result of the first carrier sensing, step 802 or step 803 is selected. carried out.
  • the first carrier sense is used to determine whether a discovery signal can be transmitted on multiple consecutive subframes.
  • the first carrier sensing may be a first level carrier sensing.
  • the sending the discovery signal on the multiple consecutive subframes may be to repeatedly send the DRS in multiple subframes, or may occupy multiple subframes to send the eDRS.
  • the structure of the eDRS may refer to the two formats in the foregoing description.
  • the configuration parameter of the first DMTC further includes a length N of the DMTC window (ie, the number of subframes included in one DMTC window), a period of the DMTC window, and a subframe start of the DMTC window in the period. position.
  • the first DMTC window may contain one or more radio frames, or a portion of a radio frame.
  • the length of the first DMTC window may be 10 ms for one radio frame
  • the period of the DMTC window may be 40 ms
  • the start position of the subframe may be subframe 0.
  • the performing, by the base station, the first carrier sensing in the first R subframes of the timing in the timing of the first discovery signal measurement of the radio frame in the DMTC window includes:
  • the base station first performs first carrier sensing on a first subframe of one radio frame in the first DMTC window, and if the first carrier sensing fails, the base station continues to target the next one on the timing
  • the subframe performs the first carrier sensing. If the interception is successful, step 802 is performed; otherwise, the first carrier sensing is continued for the next subframe in the timing.
  • Performing carrier sensing in the first subframe may be understood as performing first carrier sensing before the first subframe to determine if the channel is idle.
  • the first DMTC configured in this application can support eDRS in a DMTC window.
  • the first R subframes of the timing of one radio frame in the first DMTC window may be used as the starting position of the subframe of the eDRS.
  • one radio frame in the first DMTC window is divided by the first R subframes in the timing.
  • the outer subframe may be used as the subframe start position of the DRS, or the base station may serve as the subframe start position of the DRS for the subframe other than the first R subframes in the first DMTC window, so that the first DMTC window can be implemented.
  • the intra eNB acquires the eDRS and the transmission opportunity of the DRS.
  • Step 802 If the first carrier is successfully detected, the base station sends a discovery signal on M consecutive subframes, where the M is greater than or equal to 2.
  • the first carrier sensing succeeds on behalf of the base station to determine that the first channel is idle, and can be used to send a discovery signal.
  • the base station performs the first carrier sensing success before the first subframe, and determines that the channel is idle.
  • the first DMTC window includes 10 subframes. If the base station performs the first carrier successfully before the second subframe, that is, the subframe 1 in the first 6 subframes, the base station determines that the channel is idle at this time, and can be used to send the discovery signal. .
  • the M consecutive subframes may be subframes that repeatedly send multiple DRSs, or may be subframes that occupy M consecutive subframes for transmitting eDRSs.
  • the base station when the base station performs the first carrier sensing success in a subframe of the first R subframes in the timing of the radio channel in the first discovery signal measurement timing DMTC window,
  • the discovery signal is transmitted on M consecutive subframes starting from a certain subframe.
  • the discovery signal is carried on multiple subframes, and the transmission of the enhanced discovery signal is supported to enable the UE to access in a weak coverage scenario to ensure cell coverage performance.
  • the value of the M may be a preset value, such as specified in a standard or a protocol, or may be dynamically or semi-statically configured by the base station.
  • the base station may dynamically configure the number M of subframes occupied by the discovery signal, or may be semi-statically configured in a periodic or other manner.
  • the discovery signal carried on the M consecutive subframes may be specifically: repeatedly sending multiple DRSs on M consecutive subframes, or sending eDRSs on M consecutive subframes.
  • the first subframe of the M consecutive subframes is compatible or includes a discovery signal in the prior art.
  • the value of M is 5.
  • the base station determines to perform the first carrier sensing success for the Lth subframe in the first DMTC window, where the L The subframes are located in the first R subframes of the radio frame in the first DMTC window, and the base station starts to transmit the discovery signal occupying M consecutive subframes in the Lth subframe.
  • the base station determines that the first discovery signal measurement timing is located in the DMTC window at the timing.
  • the number of subframes after the subframe is greater than or equal to M, where M is the number of subframes occupied by the enhanced discovery signal eDRS, and if M is greater than 1, the base station transmits the eDRS.
  • the number of subframes of the DMTC window in the existing standard is up to 10, including subframe 0 to subframe 9, which is a radio frame, and the eDRS occupied by the present application is occupied.
  • the number of subframes M is 2 or more, and may be a fixed format, for example, the first subframe is 1.0 DRS, and the remaining subframes are 1.1 DRS.
  • the first DMTC window configured in this application may include N subframes. Then, if N is less than or equal to 11-M, then R is less than or equal to N, and if N is greater than 11-M, then R is less than or equal to 11-M.
  • the first DMTC window can be executed.
  • One carrier senses the subframe position used to transmit the eDRS.
  • the R value is up to 11-M, which ensures that the subframe occupied by the eDRS does not occupy the subframe 0 outside the existing DMTC window, and the subframe format of the eDRS even if it belongs to multiple radio frames. It does not conflict with the subframe 0 outside the window specified in the prior art, which must be 1.0 DRS.
  • any one of all subframes in the first DMTC window may be used to perform first carrier sensing to When the first carrier sensing is successful, it is used as the starting subframe for transmitting the eDRS.
  • the minimum number of subframes M occupied by the eDRS is 2, and N is equal to 9, that is, the first DMTC window includes subframe 0 to subframe 8, and R is equal to 9. That is, if the base station performs the first carrier sensing successfully for the subframe 8, the subframe occupied by the eDRS is the subframe 8 in the first DMTC window and the subframe 9 outside the first DMTC window in the order of the subframe number. It can be ensured that the subframe occupied by the eDRS of the present application does not conflict with the first subframe 0 outside the window when the existing DMTC window length is 10, even if the window is out.
  • the number of subframes occupied by the eDRS is 5, N is less than or equal to 6, and R is less than or equal to 6.
  • the length of the first DMTC window is 6, including subframe 0 to subframe 5, even in the sixth subframe.
  • the subframe occupied by the eDRS includes the subframe 5 in the first DMTC window and the subframe 6 to the subframe 9 outside the first DMTC window, and does not exist with the existing subframe.
  • the DMTC window has a length of 10 and the first subframe 0 outside the window must be a 1.0 DRS collision.
  • N is greater than 11-M and R is less than or equal to 11-M
  • M is 2
  • R is at most 9.
  • the first carrier is successfully detected in the frame 8 and the subframes occupied by the eDRS are the subframe 8 and the subframe 9 in the first DMTC window in the order of the subframe number, which can ensure that the subframe occupied by the eDRS of the present application does not have the first A DMTC window, and will not conflict with the first subframe 0 outside the existing DMTC window length of 10 must be 1.0 DRS.
  • the eDRS occupies 5 subframes, and the length N of the first DMTC window is 10, where R is 6, that is, the first DMTC window includes subframe 0 to subframe 9, and the starting subframe of 5 subframes occupied by the eDRS can be For any subframe in subframe 0-subframe 5, for example, when subframe 5 is performed, the first carrier sensing is successful, and the 5 subframes occupied by the eDRS include subframe 5 to subframe 9, and the subframe occupied by the eDRS is not Exceeded the first DMTC window.
  • the present application further provides that the first R subframe positions of one radio frame that can perform the first carrier sensing according to the length N of the first DMTC window and the number of subframes Q carrying the subframe number when transmitting the eDRS, that is, can be used as The range of the starting subframe of the subframe occupied by the eDRS.
  • Q is less than or equal to the number of subframes M occupied by the eDRS.
  • the subframe occupied by the eDRS may belong to multiple radio frames, that is, may occupy Subframe 0 outside the existing DMTC window.
  • the application can determine the transmission format of the eDRS according to the number of subframes M occupied by the eDRS and the Q values of the first Q subframes that carry the subframe number, so that even if the subframe occupied by the eDRS includes the subframe 0 outside the existing DMTC window,
  • the UE may also demodulate the subframe number of the first Q subframes according to the previous Q subframes, so that the transmission format of the eDRS may be determined to avoid the foregoing collision.
  • the subframe format of the last MQ subframes occupied by the eDRS may not be 1.0 DRS, that is, the subframe format of the subsequent MQ subframes may be 1.1 DRS; this is because the subframe occupied by the eDRS does not include the current frame.
  • subframe 0 there is a subframe 0 outside the DMTC window, that is, it does not conflict with the subframe 0 outside the DMTC window specified by the existing standard as 1.0DRS; 2) if the subframe number of the starting subframe occupied when the eDRS is transmitted is greater than 10 -M is less than or equal to 10-Q, and in the latter MQ subframes occupied by the eDRS, the format of the subframe 0 may be 1.0 DRS. This is because if the subframe number of the starting subframe occupied by the eDRS is greater than 10-M and less than or equal to 10-Q, the post-MQ subframes occupied by the eDRS will include the subframe 0 outside the existing DMTC window, in order to avoid conflicts.
  • the format of the subframe 0 in the last MQ subframes occupied by the eDRS may be set to 1.0 DRS.
  • any one of the first DMTC windows can be used to perform first carrier sensing, and at most N subframes can be used.
  • the first carrier sensing is performed, and the subframe when the first carrier sensing is successful is used as the starting subframe of the transmitting eDRS.
  • Q 3, that is, the first 3 subframes of the eDRS carry the subframe number
  • N is 8, and R is also 8, so the subframe of the first DMTC window includes subframe 0 to subframe 7, and the initiator of the eDRS is occupied.
  • the maximum subframe number of the frame may be 7, that is, all subframes in the first DMTC window may be used to perform the first carrier sensing.
  • N is greater than 11-Q
  • R is less than or equal to 11-Q, that is, if the length N of the first DMTC window is greater than 11-Q
  • the base station can at most be a sub-frame of a radio frame from the first DMTC window.
  • a total of 11-Q subframes from frame 0 to subframe 10-Q perform first carrier sensing. For example, when Q is 3 and N is 10, the subframe in which the base station can perform the first carrier sensing is the subframe 0 to the subframe 7 in the first DMTC window.
  • the base station has a maximum of 11-Q subframes in the first DMTC window regardless of the length N value of the first DMTC window.
  • the first carrier sense can be performed.
  • the base station can perform the first carrier sensing in the first DMTC window by up to 8 subframes. , including subframe 0 to subframe 7.
  • N is less than or equal to 8, for example, N is 6, if the subframe number when the first carrier sensing is successful is greater than or equal to 0, less than or equal to 5, the maximum range of the subframe number of the subframe occupied by the eDRS is sub Frame 5 to subframe 9, including subframe 5 to subframe 7 within the first DMTC window and subframe 8 and subframe 9 outside the first DMTC window.
  • the subframe format of the frame may not be 1.0 DRS, that is, the subframe format of the last two subframes may be 1.1 DRS, which is different from the format of the 1.0 DRS.
  • the eDRS format may be eDRS format 1 as shown in FIG. 8a. That is, the first subframe of the eDRS is 1.0 DRS, which is compatible with the existing standard format, and the formats of the remaining four subframes may all be 1.1 DRS.
  • the subframe number when the first carrier sensing is successful is greater than 5 and less than or equal to 7, that is, the subframe number of the starting subframe occupied when the eDRS is transmitted may be 6 or 7, regardless of the length N of the first DMTC window. If it is less than or equal to 8 or greater than 8, the 5th subframe or the 4th subframe of the 5 subframes occupied by the eDRS will occupy the subframe 0 outside the existing DMTC window.
  • the format of the subframe 0 in the last 2 subframes occupied by the eDRS may be set to 1.0 DRS. As shown in FIG.
  • the format of the subframe 6 may be set to 1.0 DRS, and the format of the subframe 7 to the subframe 9 is 1.1 DRS.
  • the format of the subframe 0 outside the DMTC window is 1.0 DRS, as shown in the eDRS format 2 in FIG. 8a; if the subframe number of the starting subframe occupied when the eDRS is transmitted is 7, the format of the subframe 7 can be set to 1.0 DRS.
  • the format of the subframe 8 and the subframe 9 is 1.1 DRS
  • the format of the subframe 0 outside the existing DMTC window is 1.0 DRS
  • the subframe 1 is 1.1 DRS, as in the eDRS format 3 in FIG. 8a.
  • the UE knows the number of subframes M occupied by the eDRS in advance.
  • the UE can infer the subframe number occupied by the subsequent MQ subframes, thereby determining the eDRS. Subframe format.
  • Step 803 If the first carrier sensing fails, the base station performs second carrier sensing on a subframe other than the first R subframes in time series for one radio frame in the first DMTC window, or Optionally, the base station performs second carrier sensing on the subframes other than the first R subframes in the first DMTC window.
  • the base station performs second carrier sensing on the subframes other than the first R subframes in the timing of one radio frame in the first DMTC window, that is, if the first If the second carrier sensing performed by the DMTC window on the subframe other than the previous R subframes is successful, the base station sends a discovery signal on one subframe in the first DMTC window, the discovery The signal occupies only one sub-frame, and may be a discovery signal in the prior art or a new discovery signal, which is not specifically limited herein.
  • the base station cannot acquire the transmission opportunity in the first DMTC window, and does not send the discovery signal.
  • the second carrier sensing succeeds on behalf of the base station to determine that the first channel is idle, and can be used to send a discovery signal.
  • the base station may perform second carrier sensing for one radio frame in the first DMTC window except for the first R sub-frames. .
  • the second carrier sense is used to determine whether a discovery signal can be transmitted on one subframe.
  • the second carrier sensing may be a second level of carrier sensing, for example, the above cat. 2 LBT, and the cat. 2 LBT is used to determine whether the DRS can be sent in one subframe.
  • the performing, by the base station, the second carrier sensing on the subframes other than the first R subframes in the timing of the one radio frame in the first DMTC window includes:
  • the base station first performs second carrier sensing on the first subframe of the subframe except the first R subframes in the timing of the one radio frame in the first DMTC window, if the second carrier If the interception fails, the base station continues to perform the second carrier sensing for the next subframe of the subframe except the previous R subframes on the sequence, and if the interception succeeds, the subframe is sent on the subframe that is successfully detected. The signal is found; otherwise the second carrier sensing continues to be performed for the next sub-frame on the timing.
  • the first carrier sense and the second carrier sense in the embodiment of the present application are not limited to the foregoing description.
  • the first carrier sensing and the second carrier sensing may be different in one or more aspects of the listening duration, the listening mode, the occupation duration, and the like, and the foregoing levels may also be differentiated according to existing different listening modes. For example, based on the rollback and non-backoff-based listening modes, the specific cat.4 LBT and cat.2 LBT belong to different listening levels, and may also be based on one of the listening duration, the listening mode, and the occupation time. Or the difference definition of multiple values, which is not specifically limited here.
  • the first carrier sensing may be a back-based CCA, such as the cat.
  • Carrier sensing can be a non-return-based CCA, such as the cat.2 LBT described above. It can be used to send a discovery signal that occupies only one subframe when the listening execution succeeds.
  • performing carrier sensing (first or second carrier sensing) for one subframe refers to a period of time before the one subframe (ie, The base station performs the first carrier sensing or the second carrier sensing, and performs interception when the corresponding carrier sensing condition is met, where the base station performs the first carrier sensing or the second carrier sensing.
  • the base station performs the first carrier sensing or the second carrier sensing, and performs interception when the corresponding carrier sensing condition is met, where the base station performs the first carrier sensing or the second carrier sensing.
  • any one of the subframes in the first DMCT window may be used to carry a discovery signal that occupies only one subframe.
  • the eNB may determine that the first R subframes of the eDRS may be sent by attempting to perform the Cat. 4 LBT in one radio frame in the first DMTC window. Or determining, according to the length N of the first DMTC window and the number of subframes Q carrying the subframe number when transmitting the eDRS, that the Cat. 4 LBT may be attempted to be transmitted in one radio frame in the first DMTC window to transmit the first R subframes of the eDRS, if The eNB determines that the number of UEs in the weak coverage scenario is small and does not need to attempt to perform the Cat.
  • the eNB may stop performing Cat on any one of the first R subframes in one radio frame in the first DMTC window. .4 LBT, and attempt to perform Cat.2 LBT on the remaining subframes in the one radio frame within the first DMTC window.
  • the eNB may also try to perform the Cat. 2 LBT in the first subframe of the first R subframes in a radio frame in the first DMTC window, and then successfully send the DRS in the current subframe after the success.
  • the eNB may continue to attempt to perform the Cat. 4 LBT to start transmitting the eDRS in the subframe when the Cat. 4 LBT is successful.
  • a user equipment detects a discovery signal in a first R subframes of a radio frame in the first DMTC window; the discovery signal is carried on M consecutive subframes. , M is greater than or equal to 2.
  • the UE considers that the first subframe of the M consecutive subframes is located in one radio frame in the first DMTC window, so the UE detects the discovery in the first R subframes in the one radio frame. The signal, if detected, the UE receives the discovery signal on the M consecutive subframes.
  • the UE may determine the subframe format of the eDRS according to the subframe number of the previous Q subframes.
  • the UE does not detect the discovery signal in the first R subframes, the UE is in the first DMTC window, except for the first R subframes in the timing.
  • the subframe continues to detect the discovery signal, and if the discovery signal can be detected, the discovery signal occupies only one subframe.
  • the R is less than or equal to N-M+1.
  • the value of R is equal to N-M+1.
  • the base station If the base station performs the first carrier sensing in the first R subframes until the first carrier sensing for the Rth subframe is successful, the base station sends the discovery signal from the M subframes starting from the Rth subframe. The transmission of the discovery signal is completed within the first DMTC window.
  • the value of R is less than N-M+1.
  • the base station If the base station performs the first carrier sensing in the first R subframes until the first carrier sensing for the Rth subframe is successful, the base station sends the discovery signal from the M subframes starting from the Rth subframe. Discovery letter The length of the number does not exceed the length of the first DMCT window.
  • the base station performs first carrier sensing for the first R subframes in the timing, and if the first carrier sensing for the R subframes is performed successfully, the base station starts from the Rth subframe.
  • a discovery signal is transmitted, and the discovery signal is carried on the M consecutive subframes.
  • the first carrier sense here may be a back-based CCA, such as the cat.4LBT described in the above description.
  • the embodiment of the present application may divide the first DMTC window into two parts, the first part is the first R subframes in the time series, and the second part is the subframe except the previous R subframes in the time series, so that the base station
  • the first carrier is configured to perform the first carrier sensing, so that after the first carrier is successfully detected, the discovery signal that occupies the M consecutive subframes may be sent, and the coverage performance of the guaranteed cell is improved when the UE is in the weak coverage scenario.
  • the discovery signal its starting subframe is in the first R subframes of the first portion, such that transmission of M consecutive subframes does not exceed the first DMTC window.
  • the base station performs first carrier sensing, such as Cat. 4 LBT, for the first 5 subframes in the DMTC window, such that even the fifth subframe in time series After the detection is successful, the transmission of the discovery signal carried on the six consecutive subframes does not exceed the length of the DMTC window.
  • the base station targets The last 5 subframes within the window perform a second carrier sense, such as Cat.
  • the base station may perform corresponding carrier sensing recorded in the foregoing process for the subframes in the next window.
  • the length N of the DMTC window is 10 ms
  • the number of subframes occupied by the eDRS is 5, and the eNB determines that the number of UEs in the weak coverage scenario is small. If the eNB performs a Cat. 4 LBT failure before subframe 0, the eNB determines that the identity 1 of the next subframe 1 is less than 5, then continues to perform the Cat. 4 LBT before the next subframe 1, and similarly, if the subframe 2 and the subframe Frame 3 performs the Cat.4 LBT still fails, and the eNB determines to perform the Cat.2 LBT before the next subframe 4 without performing more Cat.4 LBT. It should be noted here that the eNB can determine when the current level of carrier sensing can be terminated according to the actual communication scenario and condition, and use other levels of carrier sensing.
  • the length N of the DMTC window is 10 ms, and the number of subframes occupied by the eDRS is 5. If the eNB fails to perform the Cat. 4 LBT before the subframe 0, the eNB determines that the identifier 1 of the next subframe 1 is less than 5. Then, continue to perform the Cat.4 LBT before the next subframe 1. Similarly, if the subframe 2 and the subframe 3 are passed, and the Cat. 4 LBT fails until the subframe 4, the eNB determines that the identifier 5 of the next subframe 5 is equal to If the value of NM is 5, then the eNB still performs the Cat.4 LBT before the subframe 5.
  • the eNB can start sending the eDRS from the subframe 5, and the transmission of the eDRS is occupied at this time. Frame 5 to subframe 9. If the Cat. 4 LBT failure is performed before subframe 5, the eNB determines that the value 6 corresponding to the next subframe R+1 is greater than the value 5 of NM, then the eNB performs the Cat. 2 LBT before the next subframe 6, if in the subframe 6 Before the implementation of the Cat. 2 LBT is successful, the eNB transmits the DRS in subframe 6, and if the Cat. 2 LBT fails before the subframe 6, the eNB continues to perform the Cat. 2 LBT before the subframe 7.
  • the timing configuration is measured by the new discovery signal, and the transmission of the enhanced discovery signal is supported to implement the UE to access in the weak coverage scenario to ensure the coverage performance of the cell.
  • the signal format of the eDRS is a standard format, for example, the first subframe of the eDRS mentioned in the above description is 1.0 DRS, and the remaining subframes are 1.1 DRS, so that the subframe occupied by the eDRS is guaranteed to be in one radio frame, Will encounter the DMTC window specified in the existing standards Any one of the subframes 0. Because in the existing standard, when the subframe 0 outside the DMTC window is a downlink subframe, the subframe 0 must be 1.0 DRS, which conflicts with the eDRS.
  • a plurality of formats may be defined for the eDRS according to the number of subframes occupied by the eDRS and the number of subframes carrying the subframe number, so that the UE determines, according to the subframe number, that the eNB sends the In which format eDRS, the UE can detect the eDRS according to the determined format. That is, if the first DMTC window configured by the present application can enable the transmission of the eDRS in one radio frame in the DMTC window, the signal format of the eDRS can be a standard format, and the UE can receive the eDRS according to the standard format of the eDRS. If the subframe occupied by the eDRS transmission belongs to multiple radio frames in the DMTC window, the subframe format of the eDRS may be set to reduce the implementation complexity of the eNB and the UE.
  • the first DMTC window configured by the present application and the starting position of the existing DMTC window may be the same, starting from subframe 0.
  • the first DMTC window configured by the present application is used to confirm whether to perform the first carrier sensing.
  • the length N of the first DMTC window configured by the present application and the number of subframes M occupied by the eDRS may be used to determine a range of the number of intra subframes R that can be used to perform the first carrier sensing.
  • the length of the first DMTC window configured in the present application may be less than or equal to 11-M, or may be greater than 11-M, and the maximum value of R may be 11-M, which may be occupied when the eDRS is sent.
  • the subframe is in a radio frame. If the first Q subframes of the subframe occupied by the eDRS carry the subframe number, the R maximum may be 11-Q, which may enable the UE to belong to multiple radio frames even if the subframe occupied by the eDRS belongs to the UE.
  • the transmission format of the eDRS may be determined according to the subframe number carried in the previous Q subframes.
  • the configuration parameters of the first DMTC window configured in the present application may be configured as follows: the parameter dmtc-Periodicity-mf indicating the period of the first DMTC window may be, for example, 40 ms, 80 ms, 160 ms, etc., indicating the start of the first DMTC window.
  • the parameter dmtc-Offset-mf of the frame may be selected according to a period. For example, when the period parameter is 160 ms, the position of the starting subframe may be any one of subframe 0 to subframe 159; indicating the length of the first DMTC window in the period.
  • the parameter dmtc-WindowSize-mf may be any value from 1 to 11-M, or if the first Q subframes in the M consecutive subframes carry a subframe number, the parameter dmtc-WindowSize indicating the length of the first DMTC window- Mf can be any of 1 to 11-Q.
  • the length of the first DMTC window may be greater than or equal to 1, and less than or equal to 11-M, or the length of the first DMTC window may be greater than or equal to 1, and less than or equal to 11-Q, as long as the first If the Cat.4 LBT is successfully executed in the DMTC window, the eDRS can be sent from the subframe when the Cat.4 LBT is successful.
  • the eNB performs the first carrier sensing in the foregoing step 801.
  • the eNB may perform the first carrier sensing in one radio frame of the first DMTC window, or the eNB performs the first carrier sensing before the first DMTC window. It is determined whether the first subframe of the first DMTC window is available.
  • the eNB in the foregoing step 801 performs the first carrier sensing, and the eNB may perform the Cat. 4 LBT before the subframe in one radio frame of the first DMTC window, for example, performing the Cat. 4 LBT before the subframe 0, if If the Cat.4 LBT succeeds before the subframe 0, the eNB sends the eDRS from the subframe 0 to the subframe 0 to the subframe 4. If the Cat.4 LBT fails before the subframe 0 in the first DMTC window, the next The Cat.4 LBT continues to execute before the subframe. Once the Cat.4 LBT failure is performed before a certain subframe R, for example, the subframe 5 in the first DMTC window performs a Cat.
  • the eNB is in subframe 6, ie
  • the subframe 6 of the DMTC window of the prior art configuration attempts to perform the Cat. 2 LBT before, and if the Cat. 2 LBT is successful before the subframe 6, the DRS is transmitted in the subframe 6. That is, the length of the first DMTC window is 6, that is, from subframe 0 to subframe 5, and the starting subframe is 0.
  • the eNB can perform in the first DMTC window.
  • the Cat.4 LBT attempts to send the eDRS. If unsuccessful, the Cat.2 LBT attempt to send the DRS can be performed within the remaining opportunities of the existing DMTC window.
  • the first DMTC window length may also exceed 11-Q, that is, the N values of the N subframes included in the first DMTC window may also be greater than 11-Q, but the chance of transmitting the eDRS is allowed.
  • the first 11-Q subframes of a radio frame in a DMTC window in time series, that is, the start subframes in M consecutive subframes are in the first 11-Q subframes in the one radio frame.
  • the first DMTC may be configured as follows: the parameter dmtc-Periodicity-mf indicating the period of the first DMTC window may be, for example, 40 ms, 80 ms, 160 ms, etc., indicating the parameter dmtc-Offset of the starting subframe of the first DMTC window. -mf may be selected according to a period.
  • the position of the starting subframe may be any one of subframe 0 to subframe 159; the parameter indicating the length of the first DMTC window in the period is dmtc-WindowSize-mf It may be any value from 1 to 16, for example, the first DMTC window length is 16 ms, including 10 subframes of one complete radio frame in the period, and a part of the next radio frame, that is, the previous radio frame timing 6 subframes.
  • the base station can only perform the Cat.4 in the first 11-3 subframes of one radio frame, that is, the subframe 0 to the subframe 7.
  • LBT if the Cat.4 LBT is successfully performed in the Rth subframe from subframe 0 to subframe 7, the base station starts transmitting the eDRS on the corresponding Rth subframe.
  • the first DMTC window configured in the present application can support the first carrier sensing, that is, the transmission of the Cat. 4 LBT in the first DMTC window, optionally, if the Cat.4 LBT is executed in the first DMTC window. If it fails, in the first DMTC window, a radio frame tries to perform the Cat. 2 LBT in the remaining subframes other than the first R subframes in the sequence, so as to facilitate the transmission of the DRS, so that in the configuration of the first DMTC window, the eNB The eDRS and the DRS transmission opportunity can be obtained to ensure the coverage performance of the cell, and the subframe occupied by the eDRS does not exceed one radio frame.
  • the eDRS signal format can be a standard format, so that the UE can follow the eDRS.
  • the standard format receives the eDRS, or the subframe occupied by the eDRS belongs to multiple radio frames, and the transmission format of the eDRS may be determined according to the pre-Q subframes occupied by the eDRS, so that the UE can follow the corresponding format.
  • the base station includes corresponding hardware structures and/or software modules for performing various functions.
  • the present application 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 to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.
  • the embodiment of the present application may divide the function module into the base station according to the foregoing method example.
  • each function module may be divided according to each function, or two or more functions may be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • FIG. 11 shows a possible structural diagram of the base station involved in the above embodiment.
  • the base station 1100 includes a storage module 1101, a processing module 1102, a receiving module 1103, and a sending module 1104.
  • the processing module 1102 is configured to control and manage the action of the base station, and the receiving module 1103
  • a sending module 1104 is configured to support communication between the base station and other network entities, such as communication with the UE, and the storage module 1101 is configured to store program codes and data of the base station.
  • the receiving module 1103 is configured to perform first carrier sensing on the first R subframes of a radio frame in the timing of the first discovery signal measurement timing DMTC window
  • the processing module 1102 is configured to determine the first Whether the carrier sensing is successful, if the first carrier is successfully detected, the sending module 1104 is configured to send the discovery signal on the M consecutive subframes, where M is greater than or equal to 2, and the first subframe of the M consecutive subframes is located at the first In a radio frame in the DMTC window; where M and R are both natural numbers.
  • the first DMTC window includes N subframes, if N is less than or equal to 11-M, then R is less than or equal to N; or, if N is greater than 11-M, then R is less than or equal to 11-M .
  • the discovery signals carried on each of the M consecutive subframes may be the same or different.
  • the first DMTC window includes N subframes, and the first Q subframes of the M consecutive subframes carry the subframe number, and Q is less than or equal to M; wherein, if N is less than or equal to 11-Q, Then R is less than or equal to N; or, if N is greater than 11-Q, then R is less than or equal to 11-Q.
  • the base station determines the format of the discovery signal on the M consecutive subframes according to the subframe number of the previous Q subframes.
  • the receiving module 1103 is configured to perform second carrier detection on a subframe other than the first R subframes in time series for one radio frame in the first DMTC window. Listening, or the base station performs second carrier sensing for subframes other than the first R subframes in the first DMTC window.
  • the transmitting module 1104 transmits a discovery signal on one subframe in the first DMTC window.
  • the first DMTC window includes N subframes, and if N is less than or equal to 11-Q, the starting subframes in the M consecutive subframes are in N subframes; or, if N is greater than 11 -Q, the starting subframe in the M consecutive subframes is in the first 11-Q subframes in one radio frame, and the first Q subframes in the M consecutive subframes carry the subframe number.
  • the first DMTC window contains one or more radio frames, or a portion of a radio frame.
  • the receiving module 1103 is configured to support a base station to perform the processes 801 and 803 of FIG. 8, and/or other processes for the techniques described herein
  • the transmitting module 1104 is configured to support a base station to perform the process of FIG. 802 and/or other processes for the techniques described herein
  • the processing module 1102 is configured to support the base station in determining whether the first carrier sense is successful or failed.
  • the storage module 1101 is configured to store program codes and data used by the base station to perform the foregoing processes 801-803.
  • the processing module 1102 can be a processor or a controller, for example, a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (Application-Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, 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.
  • Transceiver Block 1303 can be a transceiver, a transceiver circuit, a communication interface, or the like.
  • the storage module 1101 can be a memory.
  • the base station involved in the embodiment of the present application may be the base station shown in FIG.
  • the base station 1201 includes a processor 1212, a transmitter 1213, a memory 1211, a bus 1214, and a receiver 1215.
  • the transmitter 1213, the processor 1212, the receiver 1215, and the memory 1211 are connected to each other through a bus 1214.
  • the bus 1214 may be a Peripheral Component Interconnect (PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture). , EISA) bus, etc.
  • PCI Peripheral Component Interconnect
  • EISA Extended Industry Standard Architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 12, but it does not mean that there is only one bus or one type of bus.
  • the receiver 1215 may be configured to perform first carrier sensing on the first R subframes in the timing of one radio frame in the first discovery signal measurement timing DMTC window; if the first carrier is successfully detected, Then, the transmitter 1213 is configured to send a discovery signal on M consecutive subframes, M is greater than or equal to 2, and the first subframe of the M consecutive subframes is located in one radio frame in the first DMTC window.
  • M and R are both natural numbers.
  • the first DMTC window contains N subframes; if N is less than or equal to 11-M, then R is less than or equal to N; or, if N is greater than 11-M, then R is less than or equal to 11-M .
  • the discovery signals carried on each of the M consecutive subframes may be the same or different.
  • the first DMTC window includes N subframes; the first Q subframes of the M consecutive subframes carry the subframe number; Q is less than or equal to M; wherein, if N is less than or equal to 11-Q, Then R is less than or equal to N; or, if N is greater than 11-Q, then R is less than or equal to 11-Q.
  • the base station determines the format of the discovery signal on the M consecutive subframes according to the subframe number of the previous Q subframes.
  • the receiver 1215 is configured to perform second carrier detection on a subframe other than the first R subframes in time series for one radio frame in the first DMTC window. Listening, or the base station performs second carrier sensing for subframes other than the first R subframes in the first DMTC window.
  • the transmitter 1213 is configured to transmit a discovery signal on one of the first DMTC windows.
  • the first DMTC window includes N subframes, and if N is less than or equal to 11-Q, the starting subframes in the M consecutive subframes are in N subframes; or, if N is greater than 11 -Q, the starting subframe in the M consecutive subframes is in the first 11-Q subframes in one radio frame, and the first Q subframes in the M consecutive subframes carry the subframe number.
  • the first DMTC window contains one or more radio frames, or a portion of a radio frame.
  • receiver 1215 is configured to support a base station to perform processes 801 and 803 in FIG. 8, and/or other processes for the techniques described herein
  • transmitter 1213 is configured to support base station execution maps. 802, and/or other processes for the techniques described herein
  • processor 1212 for supporting base The station determines whether the first carrier is successfully detected or failed.
  • the memory 1211 is configured to store program codes and data used by the base station to perform the above processes 801-803.
  • the steps of a method or algorithm described in connection with the present disclosure may be implemented in a hardware or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium 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.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device.
  • the processor and the storage medium may also exist as discrete components in the core network interface device.
  • the functions described herein can be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

本申请实施例提供一种发现信号的发送方法、检测方法、基站和用户设备，涉及通信领域，能够通过新的发现信号测量定时配置，支持增强的发现信号的传输以实现UE在弱覆盖场景下进行接入，保证小区的覆盖性能。其方法为：基站针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧执行第一载波侦听，若第一载波侦听成功，则基站在M个连续子帧上发送发现信号，M大于或等于2，M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中，其中，M和R均为自然数。本申请实施例用于发送eDRS和DRS。

Description

一种发现信号的发送方法、检测方法、基站和用户设备 技术领域
本申请涉及通信领域，尤其涉及一种发现信号的发送方法、检测方法、基站和用户设备。
背景技术
MF(MulteFire)***中，用户设备(User Equipment，UE)通过接收基站设备的发现信号(discovery signal，DRS)来完成入网流程。通常，基站只能通过一个子帧向多个UE发送发现信号，该信号包括主同步信号(primary synchronization signal，PSS)，MF主同步信号(MF-primary synchronization signal，MF-PSS)，辅同步信号(secondary synchronization signal，SSS)，MF辅同步信号(MF-secondary synchronization signal，MF-SSS)以及MF物理广播信道(physical broadcast channel，MF-PBCH)。UE接收DRS解析PSS、MF-PSS，SSS，MF-SSS，以便获得物理小区标识(physical cell ID，PCI)，解析MF-PBCH以便获得***带宽等信息，并完成与基站时钟、频率同步。DRS在一个子帧内传输，占用12个或14个正交频分复用(orthogonal frequency division multiplexing，OFDM)符号，其中，PSS、SSS、MF-PSS以及MF-SSS分别占用1个符号。另外，MF-PBCH占用6个正交频分复用(orthogonal frequency division multiplexing，OFDM)符号。
当MF***部署于港口、码头、自动化生产流等场景时，由于用户设备普遍具有较高的移动性，在用户设备的移动过程中，基站发送的无线信号容易被用户设备和基站之间各种物体遮挡，从而导致无线信号质量较差，用户设备可能无法正常接收；另一方面，由于用户设备数量较大，在移动过程中，也容易发生互相遮挡无线信号的情况，也会导致用户设备可能无法正常接收基站发送的数据。此时，对基站下发的信号质量有较高需求，需要基站提供更好的无线覆盖能力来应对无线信号质量较差的场景。
现有MF***中DRS在一个子帧内完成传输，当UE处于信号质量较差的弱覆盖场景，会出现不能正常接收DRS的情况。因此，UE无法获得同步信号和MF-PBCH信息，从而不能与基站时钟、频率同步，无法获得***信息，从而也就不能通过基站接入核心网。
发明内容
本申请实施例提供一种发现信号的发送方法、检测方法、基站和用户设备，通过新的发现信号测量定时配置，支持增强的发现信号的传输以实现UE在弱覆盖场景下进行接入，提升小区的覆盖性能。
一方面，提供一种发现信号的发送方法，包括：基站针对第一发现信号测量定时(Discovery Signal Measurement Timing，DMTC)窗口中一个无线帧在时序上的前R个子帧执行第一载波侦听；若第一载波侦听成功，则基站在M个连续子帧上发 送发现信号，M大于或等于2；M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中；其中，第一DMTC窗口包含N个子帧，M、N和R均为自然数。第一载波侦听成功可以为在第一子帧之前执行第一载波侦听成功，确定信道空闲。也就是说，本申请实施例可以将第一DMTC窗口中一个无线帧分为两部分，可以从第1个子帧即子帧0之前开始尝试执行第一载波侦听，如果在前R个子帧范围内执行第一载波侦听成功，可以在多个连续子帧上发送发现信号，相比于现有技术中的发现信号DRS占用1个子帧，本申请这样通过新的发现信号测量定时配置，可以支持增强的发现信号的传输以实现UE在弱覆盖场景下进行接入，以提升小区覆盖性能。
在一种可能的设计中，第一DMTC窗口包含N个子帧；若N小于或等于11-M，则R小于或等于N；或者，若N大于11-M，则R小于或等于11-M。也就是说，在DMTC中一个无线帧内，最多有11-M个子帧可以用于执行第一载波侦听，且由于发现信号占用M个子帧，这样，可以使得M个连续子帧在一个无线帧内，不会与现有DMTC窗外子帧0位置规定的发现信号的格式产生冲突。
在一种可能的设计中，M个连续子帧的每个子帧上承载的发现信号可以相同或不同。例如M个连续子帧可以是重复发送多个DRS，也即增强的DRS，也可以是发送新定义的增强的发现信号(Enhanced Discovery Signal,eDRS)。eDRS与DRS的核心区别为eDRS发送时占用的子帧数与DRS发送时占用的子帧数不同，DRS占用一个子帧，eDRS可以占用多个子帧。
在一种可能的设计中，第一DMTC窗口包含N个子帧，M个连续子帧中的前Q个子帧携带子帧号，Q小于或等于M；其中，若N小于或等于11-Q，则R小于或等于N；或者，若N大于11-Q，则R小于或等于11-Q。也就是说，在第一DTMC窗口中的一个无线帧内，最多有11-Q个子帧可以用于执行第一载波侦听。由于M个连续子帧中的前Q个子帧携带子帧号，UE便可以根据前Q个子帧的子帧号，确定基站发送的M个连续子帧上发现信号的格式。
在一种可能的设计中，在基站发送发现信号之前，基站根据前Q个子帧的子帧号确定M个连续子帧上的发现信号的格式。
在一种可能的设计中，若第一载波侦听失败，则基站针对第一DMTC窗口中一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听，或者基站针对第一DMTC窗口中除前R个子帧之外的子帧执行第二载波侦听。也就是说，如果在前R个子帧执行第一载波侦听失败，那么可以从一个无线帧中R个子帧以外的第1个子帧开始之前执行第二载波侦听。例如说第一载波侦听为发送上述eDRS进行配置，如果前R个子帧执行第一载波侦听失败，则没有了eDRS的发送机会；针对一个无线帧中R个子帧之外的子帧执行为DRS配置的第二载波侦听，以便可以得到DRS的发送机会。第一载波侦听成功需要信道空闲的时间不短于第二载波侦听成功需要信道空闲的时间。第一载波侦听可以适用于占用子帧数多于一个的eDRS的发送，第二载波侦听可以适用于占用子帧数不多于一个的DRS的发送。
在一种可能的设计中，第一DMTC窗口包含N个子帧；若N小于或等于11-Q，则M个连续子帧中的起始子帧在N个子帧中；或者，若N大于11-Q，则M个连续子帧中的起始子帧在一个无线帧中的前11-Q个子帧中。其中，M个连续子帧中的前Q个 子帧携带子帧号。也即，最多有11-Q个子帧可以用于执行第一载波侦听。
在一种可能的设计中，第一DMTC窗口包含一个或多个无线帧，或者一个无线帧的一部分。
另一方面，提供一种发现信号检测方法，用户设备UE在第一发现信号测量定时DMTC窗口中的一个无线帧的前R个子帧中检测发现信号，发现信号承载于M个连续子帧上，M大于或等于2；其中，M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中,M和R均为自然数。也就是对于UE来说，UE认为基站会在第一DMTC窗口的一个无线帧中的前R个子帧中开始发送发现信号，只需要在所述前R个子帧中检测是否开始接收到发现信号。
在一种可能的设计中，第一DMTC窗口包含N个子帧；若N小于或等于11-M，则R小于或等于N；或者，若N大于11-M，则R小于或等于11-M。也就是说，前R个子帧的范围是根据第一DMTC窗口占用的子帧数和承载发现信号的子帧数确定的，以便于在发送发现信号时所占用子帧在一个无线帧内，不会与第一DMTC窗外子帧0位置规定的发现信号的格式冲突。
在一种可能的设计中，第一DMTC窗口包含N个子帧；其中，M个连续子帧中的前Q个子帧携带子帧号，Q小于或等于M；其中，若N小于或等于11-Q，则R小于或等于N；或者，若N大于11-Q，则R小于或等于11-Q。UE根据前Q个子帧的子帧号确定M个连续子帧的格式。也就是说，即使M个连续子帧属于多个无线帧，UE也可以根据前Q个子帧的子帧号确定M个连续子帧的格式。
又一方面，提供一种基站，包括接收模块、发送模块和处理模块。接收模块，用于针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧执行第一载波侦听，处理模块，用于确定第一载波侦听是否成功，若第一载波侦听成功，发送模块用于在M个连续子帧上发送发现信号，M大于或等于2，M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中，其中，M和R均为自然数。
在一种可能的设计中，第一DMTC窗口包含N个子帧；其中，若N小于或等于11-M，则R小于或等于N；或者，若N大于11-M，则R小于或等于11-M。
在一种可能的设计中，M个连续子帧的每个子帧上承载的发现信号可以相同或不同。
在一种可能的设计中，M个连续子帧中的前Q个子帧携带子帧号，Q小于或等于M；其中，若N小于或等于11-Q，则R小于或等于N；或者，若N大于11-Q，则R小于或等于11-Q。
在一种可能的设计中，在发送模块用于发送发现信号之前，处理模块用于根据前Q个子帧携带的子帧号确定M个连续子帧上的发现信号的格式。
在一种可能的设计中，若第一载波侦听失败，则接收模块用于针对第一DMTC窗口中的一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听，或者针对第一DMTC窗口中除前R个子帧之外的子帧执行第二载波侦听。
在一种可能的设计中，若第二载波侦听成功，则发送模块在第一DMTC窗口中的一个子帧上发送发现信号。
在一种可能的设计中，第一DMTC窗口包含N个子帧；若N小于或等于11-Q，则 M个连续子帧中的起始子帧在N个子帧中；或者，若N大于11-Q，则M个连续子帧中的起始子帧在第一DMTC窗口内一个无线帧中的前11-Q个子帧中；其中，M个连续子帧中的前Q个子帧携带子帧号。
在一种可能的设计中，第一DMTC窗口包含一个或多个无线帧，或者一个无线帧的一部分。
又一方面，提供一种用户设备UE，包括接收模块，用于在第一发现信号测量定时DMTC窗口中的一个无线帧的前R个子帧中检测发现信号，发现信号承载于M个连续子帧上，M大于或等于2；M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中,M和R均为自然数。
在一种可能的设计中，第一DMTC窗口包含N个子帧；若N小于或等于11-M，则R小于或等于N；或者，若N大于11-M，则R小于或等于11-M。接收模块还用于接收发现信号。UE还包括处理模块，用于根据前Q个子帧的子帧号确定M个连续子帧的格式。
在一种可能的设计中，第一DMTC窗口包含N个子帧；M个连续子帧中的前Q个子帧携带子帧号，Q小于或等于M；其中，若N小于或等于11-Q，则R小于或等于N；或者，若N大于11-Q，则R小于或等于11-Q。
在一种可能的设计中，UE根据前Q个子帧的子帧号确定M个连续子帧的格式。
再一方面，提供一种基站，包括接收器、发射器和处理器，接收器，用于针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧中执行第一载波侦听；若第一载波侦听成功，则发射器用于在M个连续子帧上发送发现信号，M大于或等于2；M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中，其中，M和R均为自然数。
在一种可能的设计中，第一DMTC窗口包含N个子帧，若N小于或等于11-M，则R小于或等于N；或者，若N大于11-M，则R小于或等于11-M。
在一种可能的设计中，M个连续子帧的每个子帧上承载的发现信号可以相同或不同。
在一种可能的设计中，第一DMTC窗口包含N个子帧；M个连续子帧中的前Q个子帧携带子帧号，Q小于或等于M；若N小于或等于11-Q，则R小于或等于N；或者，若N大于11-Q，则R小于或等于11-Q。
在一种可能的设计中，在发射器用于发送发现信号之前，处理器用于根据前Q个子帧携带的子帧号确定M个连续子帧上的发现信号的格式。
在一种可能的设计中，若第一载波侦听失败，则接收器用于针对第一DMTC窗口中的一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听，或者基站针对第一DMTC窗口中除前R个子帧之外的子帧执行第二载波侦听。
在一种可能的设计中，若第二载波侦听成功，则发射器用于在第一DMTC窗口中的一个子帧上发送发现信号。
在一种可能的设计中，第一DMTC窗口包含N个子帧；若N小于或等于11-Q，则M个连续子帧中的起始子帧在N个子帧中；或者，若N大于11-Q，则M个连续子帧中的起始子帧在一个无线帧中的前11-Q个子帧中,其中，M个连续子帧中的前Q个子 帧携带子帧号。
在一种可能的设计中，第一DMTC窗口包含一个或多个无线帧，或者一个无线帧的一部分。
又一方面，提供一种用户设备(UE)，包括接收器和发射器，接收器用于在第一发现信号测量定时DMTC窗口的一个无线帧的前R个子帧中检测发现信号；其中，发现信号承载于M个连续子帧上，M大于或等于2；M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中,M和R均为自然数。
在一种可能的设计中，第一DMTC窗口包含N个子帧；若N小于或等于11-M，则R小于或等于N；或者，若N大于11-M，则R小于或等于11-M。
在一种可能的设计中，第一DMTC窗口包含N个子帧；M个连续子帧中的前Q个子帧携带子帧号，Q小于或等于M；其中，若N小于或等于11-Q，则R小于或等于N；或者，若N大于11-Q，则R小于或等于11-Q。
在一种可能的设计中，接收器用于接收发现信号，还包括处理器，在发射器用于发送所述发现信号之前，处理器用于根据前Q个子帧的子帧号确定M个连续子帧上的发现信号的格式。
又一方面，本申请实施例提供了一种计算机存储介质，该程序被处理器执行时实现上述基站和/或用户设备任一种可能的设计中的方法。
又一方面，本申请实施例提供了一种计算机程序产品，当其在计算机上运行时，使得计算机执行如上述基站和/或用户设备任一种可能的设计中的方法。
本申请实施例提供一种发现信号的发送方法、检测方法、基站和用户设备，基站针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧执行第一载波侦听，若第一载波侦听成功，则基站在M个连续子帧上发送发现信号，M大于或等于2，M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中，其中，M和R均为自然数。也就是说，本申请实施例可以将第一DMTC窗口中的一个无线帧分为两部分，可以从第1个子帧即子帧0之前开始尝试执行第一载波侦听，如果在前R个子帧范围内执行第一载波侦听成功，可以在多个连续子帧上发送发现信号，相比于现有技术中的发现信号DRS占用1个子帧，本申请这样通过新的发现信号测量定时配置，支持增强的发现信号的传输以实现UE在弱覆盖场景下进行接入，以提升小区覆盖性能。
附图说明
图1为本申请实施例提供的一种基于免许可(unlicensed)频点部署的MF基站和无线保真(Wireless-Fidelity，wifi)共存的场景的示意图；
图2为本申请实施例提供的一种由于遮挡导致信号衰落的示意图；
图3为本申请实施例提供的一种发送DRS的DMTC窗口的配置参数示意图；
图4为本申请实施例提供的一种eDRS的格式示意图；
图5为本申请实施例提供的一种eDRS的格式示意图；
图6为本申请实施例提供的一种eDRS在DMTC窗口内发送时占用子帧的示意图；
图7为本申请实施例提供的一种eDRS的发送超出DMTC窗口的子帧的示意图；
图8为本申请实施例提供的一种DMTC配置方法的流程示意图；
图8a为本申请实施例提供的一种eDRS可能的三种格式的示意图；
图9为本申请实施例提供的一种在DMTC窗口内尝试执行Cat.4 LBT以及尝试执行Cat.2 LBT的示意图；
图10为本申请实施例提供的一种增加DMTC窗口时执行尝试执行Cat.4 LBT以及尝试执行Cat.2 LBT的示意图；
图11为本申请实施例提供的一种基站的结构示意图；
图12为本申请实施例提供的一种基站的结构示意图。
具体实施方式
为了便于理解，示例地给出了部分与本申请相关概念的说明以供参考。如下所示：
先检测后发送(Listen-Before-Talk，LBT)，为一种发送前侦听的方式，指各网元在发送数据之前，需要执行LBT，即检测信道空闲后才可以发送数据，并且每次抢占信道后，最多只能发送有限时长。
在MF***中，基站发送数据之前可以利用两个类别的LBT来对信号进行侦听，例如，基于随机回退的信道空闲评估以及非基于随机回退的信道空闲评估，具体可以Cat.2 LBT和Cat.4 LBT为例说明。
Cat.2 LBT，指非基于随机回退的信道空闲评估(Clear Channel Assessment，CCA)，例如可以是在发送节点对信道进行侦听，如果在25us内检测信道空闲，则发送节点可以立即占用该信道进行数据发送。
Cat.4 LBT，为基于随机回退的CCA，需要的侦听时长是需要随机化的，具体可以为：发送节点在0至竞争窗长度(Contention Window Size，CWS)之间均匀随机生成一个回退计数器N，并且以侦听时隙(CCA slot)为粒度进行侦听，如果侦听时隙内检测到信道空闲，则将回退计数器减一，反之检测到信道忙碌，则将回退计数器挂起，即回退计数器N在信道忙碌时间内保持不变，直到检测到信道空闲；当回退计数器减为0时发送节点可以立即占用该信道。
基站在回退计数器之前，至少需要在defer duration时间长度内检测到信道空闲。Defer duration时长的计算公式为(16+9*mp)，mp的取值可以根据优先等级(priority class)的取值如下表1所示。基站在发送数据之前对需要信道空闲的时间按照使用的优先级别进行初始化，一般来讲，优先级别越高，所需信道空闲的时间越短，但是能够发送数据的时间也越短。
表1
Figure PCTCN2017086717-appb-000001
Figure PCTCN2017086717-appb-000002
CWmin,p表示竞争窗长度的最小值，CWmax，p表示竞争窗长度的最大值，CWp表示允许的竞争窗长度取值。Tmcot,p表示允许发送数据的最长时间。比如以优先级1为例，会在0到7里选择一个随机数，比如0，就意味着基站需要侦听的时间是25+25*0＝25us；如果随机数是7，就意味着基站需要侦听的时间是25+9*7＝88us，所以对于Cat.4 LBT来说，基站需要侦听的时间最短为25us。
信道状态包括两种：信道空闲和信道忙碌。信道状态的判断准则为：无线通信设备将侦听时隙内的接收到信道上的功率与能量检测门限比较，如果高于门限，则信道状态为信道忙碌，如果低于门限，则信道状态为信道空闲。
发现信号测量定时(Discovery Signal Measurement Timing，DMTC)，用于指示根据配置参数发送发现信号的机会，其配置参数可以包括DMTC的周期(dmtc-Periodicity-mf)、周期内DMTC窗口(window)的子帧的起始位置(dmtc-Offset-mf)，以及DMTC窗口的长度(dmtc-WindowSize-mf)。
DRS，用于UE通过接收基站设备的DRS来完成入网流程。
关于DRS的发送机会，也即DRS对应的DMTC的配置参数，举例来说，如果dmtc-Periodicity-mf配置为40ms，dmtc-Offset-mf配置为0，dmtc-WindowSize-mf配置为10ms,则说明DMTC窗口的子帧的起始位置为子帧0，即无线帧(radio frame)的子帧0，每个无线帧包括10个子帧。DMTC的周期为40ms，周期内DMTC窗口的长度为10ms，即子帧0到子帧9，如图3所示。基站在DMTC窗口内，按照DMTC的配置参数，也即子帧0到子帧9，可以在子帧0开始之前的前25us执行Cat.2 LBT进行信道侦听，如果侦听到信道在25us内一直处于空闲状态，基站则发送DRS，如果执行Cat.2 LBT失败，即侦听到信道在25us内不是一直处于空闲状态，则基站可以在下一个子帧1开始之前的前25us继续执行Cat.2 LBT进行信道侦听，基站如果在某个子帧前执行Cat.2 LBT成功，则在该子帧发送DRS。
本申请描述的网络架构以及业务场景是为了更加清楚的说明本申请的技术方案，并不构成对于本申请提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请提供的技术方案对于类似的技术问题，同样适用。
本申请可以应用于长期演进(Long Term Evolution，LTE)宽带***或MulteFire(MF)***在未授权的(unlicensed)频点上发现信号的增强。Unlicensed频点的特点之一是允许不同单位和个人、不同制式的***可以使用同一个频点。目前unlicensed频点主要由wifi***使用，基于unlicensed频点部署的MF基站和wifi共存的场景之一可以如图1所示。MF***能够在unlicensed频点上独立部署，可以适应于企业、工厂、车间以及仓库等智能化作业。但这些独立部署的场景，存在一些需要深度覆盖的需求，比如港口自动牵引车辆(Automated Guided Vehicle，AGV) 车的控制，当有车车之间集装箱遮挡或立柱遮挡时，信号衰落严重，此时需要覆盖增强，如图2所示。
本申请的网络架构可以包括基站设备和用户设备。
基站(Base Station，BS)设备，也可称为基站，是一种部署在无线接入网用以提供无线通信功能的装置。例如在2G网络中提供基站功能的设备包括基地无线收发站(Base Transceiver Station,BTS)和基站控制器(Base Station Controller,BSC)，3G网络中提供基站功能的设备包括节点B(NodeB)和无线网络控制器(Radio Network Controller,RNC)，在4G网络中提供基站功能的设备包括演进的节点B(evolved NodeB，基站)，在无线局域网(Wireless Local Area Networks，WLAN)中，提供基站功能的设备为接入点(Access Point，AP)。在5G通信***中，提供基站功能的设备包括新无线节点B(New Radio NodeB,gNB)，集中单元(Centralized Unit,CU),分布式单元(Distributed Unit)和新无线控制器等。
用户设备UE是一种终端设备，可以是可移动的终端设备，也可以是不可移动的终端设备。该终端设备主要用于接收或者发送业务数据。用户设备可分布于网络中，在不同的网络中用户设备有不同的名称，例如：终端，移动台，用户单元，站台，蜂窝电话，个人数字助理，无线调制解调器，无线通信设备，手持设备，膝上型电脑，无绳电话，无线本地环路台等。该用户设备可以经无线接入网(radio access network，简称：RAN)(无线通信网络的接入部分)与一个或多个核心网进行通信，例如与无线接入网交换语音和/或数据。
当下行存在多用户调度时，功率在多用户间共享，下行用户无法满功率发送数据，需要对该种场景下的下行信道进行覆盖增强设计。
在本申请实施例中，可以定义另一种发现信号，即增强的发现信号(Enhanced Discovery Signal,eDRS)。eDRS与DRS的核心区别为eDRS发送时占用的子帧数与DRS发送时占用的子帧数不同，DRS占用一个子帧，eDRS可以占用多个子帧，使得下行用户接收到发现信号的概率增大，提升小区覆盖性能。本申请实施例中的基站能够发送eDRS，保证小区的覆盖性能。
与DRS不同的是，对于eDRS来说，eDRS在时域上占用多个子帧。这里阐述两种eDRS可能的格式。第一种可能的格式为：eDRS占用a个子帧，首子帧包含或兼容现有的DRS，除首子帧以外的其余子帧也包含DRS，但是首子帧和其它子帧包含的DRS的同步信号和广播信道不同(也可以部分相同)，时域资源位置、信号格式以及信道格式均相同。以eDRS占用3个子帧为例，该eDRS的格式可以如图4所示。第二种可能的格式为：eDRS占用a个子帧，除首子帧包含或兼容现有的DRS以外，其余子帧为新定义的DRS，均不包含现有的DRS，但是可以包含现有DRS的部分内容，比如包含部分同步信号和广播信道。以eDRS占用3个子帧为例，该eDRS的格式可以如图5所示。
以第一种可能的格式来说，eDRS在时域上占用多个子帧，以5个子帧为例，eDRS的第一个子帧包含DRS，用于兼容现有的终端设备，记为1.0DRS，1.0为MF的标准版本号，后续4个子帧的情况例如可以是：第2至第4个子帧为eDRS新定义的DRS，记为1.1DRS，第5个子帧为1.0DRS；或者第2个子帧、第3个子帧以及第5个子帧 为1.1DRS，第4个子帧为1.0DRS。
以第二种可能的格式来说，eDRS在时域上占用多个子帧，以5个子帧为例，如图6所示。eDRS第一个子帧包含DRS，即为1.0DRS，后续4个子帧为eDRS新定义的DRS，记为1.1DRS，用于MF1.1的终端对eDRS进行接收。由于eDRS包含多个子帧，基站不能再执行用于DRS发送时信道侦听的Cat.2LBT，可以执行第一载波侦听，第一载波侦听可以为Cat.4LBT，执行Cat.4LBT成功需要信道空闲的时间不短于执行Cat.2LBT成功需要信道空闲的时间。举例来说，在现有DMTC的配置下，基站在DMTC窗口内第一个子帧0即起始位置前执行Cat.4LBT，如果执行Cat.4LBT成功，则从子帧0开始在子帧0至子帧4发送eDRS,如果执行Cat.4 LBT不成功，则继续在下一子帧之前执行Cat.4 LBT直至成功，以发送eDRS。如果基站从子帧0到子帧5执行Cat.4 LBT都失败，只能从子帧6之前继续开始执行Cat.4 LBT，如果在子帧6之前执行Cat.4 LBT成功，那么在子帧6下发eDRS，这时eDRS占用的最后一个子帧超过DMTC窗口，且为1.1DRS，如图7所示，但是现有标准(MulteFire Release1.0)规定在DMTC窗口之外的任何一个子帧0如果是一个下行子帧，eNB必须发送现有的DRS，即1.0DRS，这时，eDRS需要根据起始子帧的位置定义多种格式。UE需要知道接收到的eDRS的具体格式来进行解调，否则，UE需要尝试每种可能的格式来盲检eDRS,会引起过高的复杂度。
本申请提供一种发现信号的发送和检测方法，可以提高小区覆盖性能。
步骤801：基站针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧中执行第一载波侦听；根据所述第一载波侦听的结果，选择步骤802或步骤803执行。
一种可选的设计中，所述第一载波侦听用于确定是否可以在多个连续子帧上发送发现信号。具体的，所述第一载波侦听可以为第一级别的载波侦听。其中，在多个连续子帧上发送发现信号可以是在多个子帧上重复发送DRS，也可以是占用多个子帧用以发送eDRS，eDRS的结构可以参考上述说明中的两种格式。
又一种可选的设计中，所述第一DMTC的配置参数还包含DMTC窗口的长度N(即一个DMTC窗口包含的子帧数)、DMTC窗口的周期、周期内DMTC窗口的子帧起始位置。
第一DMTC窗口可以包含一个或多个无线帧，或者一个无线帧的一部分。
例如，第一DMTC窗口的长度为N可以为一个无线帧10ms，DMTC窗口的周期为可以为40ms，子帧起始位置可以为子帧0。
又一种可选的设计中，所述基站针对第一发现信号测量定时DMTC窗口中的一个无线帧在时序上的前R个子帧中执行第一载波侦听具体包括：
所述基站先针对所述第一DMTC窗口中的一个无线帧的第一个子帧执行第一载波侦听，若所述第一载波侦听失败，则所述基站继续针对时序上的下一个子帧执行第一载波侦听，若侦听成功，则执行步骤802；否则继续针对时序上的再下一个子帧执行第一载波侦听。在第一个子帧执行载波侦听可以理解为在第一子帧之前执行第一载波侦听，以确定信道是否空闲。
基于以上流程，本申请配置的第一DMTC，可以在一个DMTC窗口内支持eDRS的 发送，第一DMTC窗口中一个无线帧在时序上的前R个子帧可以作为eDRS的子帧起始位置，可选的，第一DMTC窗口中一个无线帧在时序上的除前R个子帧之外的子帧可以作为DRS的子帧起始位置，或者基站针对第一DMTC窗口中除前R个子帧之外的子帧可以作为DRS的子帧起始位置，这样可以实现在第一DMTC窗口中一个无线帧内eNB获取eDRS以及DRS的发送机会。
步骤802：若所述第一载波侦听成功，则所述基站在M个连续子帧上发送发现信号，所述M大于或等于2。
其中，所述第一载波侦听成功代表基站确定第一信道空闲，可以用于发送发现信号。例如可以理解为基站在第一子帧之前执行第一载波侦听成功，确定信道空闲。例如第一DMTC窗口包含10个子帧，若在前6个子帧范围内，基站在第2个子帧即子帧1之前执行第一载波成功，则基站确定此时信道空闲，可以用于发送发现信号。
其中，M个连续子帧可以是重复发送多个DRS的子帧，也可以是占用M个连续子帧用以发送eDRS的子帧。
一种可选的设计中，所述基站在针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧中的某一个子帧执行第一载波侦听成功时，则从所述某一个子帧开始的M个连续子帧上发送所述发现信号。这种实现，可以使得发现信号承载于多个子帧上，支持增强的发现信号的传输以实现UE在弱覆盖场景下进行接入，以保证小区覆盖性能。
又一种可选的设计中，所述M的值可以为一预设的值，例如标准或协议中规定的，也可以是基站动态或以半静态的方式配置的。所述基站可以动态配置发现信号所占用的子帧数M，也可以以周期或者其他方式半静态配置。
进一步可选的，所述M个连续子帧上承载的发现信号可以具体为：M个连续子帧上重复发送多个DRS，或者M个连续子帧上发送eDRS。
进一步可选的，所述M个连续子帧的首子帧兼容或包含现有技术中的发现信号。
进一步可选的，所述M的值为5。
具体的，在第一载波侦听为Cat.4 LBT时，如果基站执行Cat.4 LBT成功，基站确定针对第一DMTC窗口中的第L个子帧执行第一载波侦听成功，所述第L个子帧位于所述第一DMTC窗口中一个无线帧在时序上的前R个子帧中，则所述基站在所述第L个子帧开始发送占有M个连续子帧的发现信号。
再一可选的设计中，若针对所述前R个子帧中的某一子帧的第一载波侦听成功，所述基站确定第一发现信号测量定时DMTC窗口中时序上位于所述某一子帧之后的子帧数量大于或等于M，所述M为增强的发现信号eDRS占用的子帧数，且M大于1，则所述基站发送所述eDRS。
其中，在一种可能的设计中，现有标准(MulteFire Release1.0)中DMTC窗口的子帧数最大为10，包括子帧0到子帧9，为一个无线帧，本申请配置的eDRS占用的子帧数M为2个或2个以上，且可以为一种固定的格式，例如首子帧为1.0DRS，其余子帧为1.1DRS，本申请配置的第一DMTC窗口可以包括N个子帧，那么若N小于或等于11-M，则R小于或等于N，若N大于11-M，则R小于或等于11-M。即根据第一DMTC窗口的长度N和eDRS占用的子帧数M来确定在第一DMTC窗口内可以执行第 一载波侦听用于发送eDRS的子帧位置。由于上述两种情况下，R取值最大为11-M，可以保证eDRS占用的子帧即使属于多个无线帧，也不会占用到现有DMTC窗口外的子帧0，eDRS的子帧格式不会与现有技术中规定的窗口外的子帧0必须为1.0DRS产生冲突。
针对若N小于或等于11-M，则R小于或等于N这种情况来说，第一DMTC窗口中的所有子帧中的任一个子帧都可以用于执行第一载波侦听，以在执行第一载波侦听成功时作为发送eDRS的起始子帧。
以eDRS占用的子帧数M最小值为2为例，且N等于9，即第一DMTC窗口包括子帧0至子帧8，此时R等于9。也即，如果基站针对子帧8时执行第一载波侦听成功，eDRS占用的子帧按照子帧号顺序来说为第一DMTC窗口内的子帧8和第一DMTC窗口外的子帧9，可以保证本申请的eDRS占用的子帧即使出窗也不会与现有的DMTC窗口长度为10时窗外的第1个子帧0必须为1.0DRS产生冲突。
再例如eDRS占用的子帧数M为5，N小于或等于6，R小于或等于6，在第一DMTC窗口长度为6，包括子帧0至子帧5时，即使在第6个子帧即子帧5时才执行第一载波侦听成功，那么eDRS占用的子帧包括第一DMTC窗口内的子帧5以及第一DMTC窗口外的子帧6至子帧9，也不会与现有的DMTC窗口长度为10时窗外的第1个子帧0必须为1.0DRS产生冲突。
针对若N大于11-M，则R小于或等于11-M这种情况来说，仍以M为2为例，N等于10的情况下，此时R最大为9.也即，如果在子帧8时执行第一载波侦听成功，eDRS占用的子帧按照子帧号顺序来说为第一DMTC窗口内的子帧8和子帧9，可以保证本申请的eDRS占用的子帧没有出第一DMTC窗口，并且也不会与现有的DMTC窗口长度为10时窗外的第1个子帧0必须为1.0DRS产生冲突。
再例如eDRS占用5个子帧，第一DMTC窗口的长度N为10，此时R为6，即第一DMTC窗口包括子帧0到子帧9，eDRS占用的5个子帧的起始子帧可以为子帧0-子帧5中的任一子帧，例如在子帧5时执行第一载波侦听成功，eDRS占用的5个子帧包括子帧5至子帧9，eDRS占用的子帧没有超出第一DMTC窗口。
本申请还提供一种根据第一DMTC窗口的长度N和发送eDRS时携带子帧号的子帧数Q来确定可以执行第一载波侦听的一个无线帧的前R个子帧位置，即能够作为eDRS占用的子帧的起始子帧的范围。Q小于或等于eDRS占用的子帧数M。
在一种可能的设计中，若N小于或等于11-Q，则R小于或等于N，若N大于11-Q，则R小于或等于11-Q。于是这种情况下，由于Q值小于M，11-Q小于11-M，那么在R小于或等于11-Q的情况下，eDRS占用的子帧可能属于多个无线帧，也即可能会占用到现有DMTC窗口外的子帧0。
于是，本申请可以根据eDRS占用的子帧数M和携带子帧号的前Q个子帧的Q值确定eDRS的发送格式，这样即使eDRS占用的子帧包含现有DMTC窗口外的子帧0，UE也可以根据前Q个子帧解调出前Q个子帧的子帧号，从而可以确定出eDRS的发送格式，避免上述冲突。
在一种可能的设计中，假设发送eDRS时占用M个子帧，其中前Q个子帧携带子帧号，则：1)如果发送eDRS时占用的起始子帧的子帧号大于或等于0,且小于或等 于10-M，那么eDRS占用的后M-Q个子帧的子帧格式可以不为1.0DRS，即后M-Q个子帧的子帧格式可以均为1.1DRS；这是由于eDRS占用的子帧不会包括现有DMTC窗口外的子帧0，也即不会与现有标准规定的DMTC窗口外的子帧0为1.0DRS产生冲突；2)如果发送eDRS时占用的起始子帧的子帧号大于10-M且小于或等于10-Q，那么eDRS占用的后M-Q个子帧中，子帧0的格式可以为1.0DRS。这是由于如果eDRS占用的起始子帧的子帧号大于10-M且小于或等于10-Q时，eDRS占用的后M-Q个子帧会包含现有DMTC窗口外的子帧0，为了避免冲突，eDRS占用的后M-Q个子帧中子帧0的格式可以设置为1.0DRS。
针对N小于或等于11-Q，则R小于或等于N这种情况来说，即第一DMTC窗口中的任一个子帧都可以用于执行第一载波侦听，且最多有N个子帧可以执行第一载波侦听，并将执行第一载波侦听成功时的子帧作为发送eDRS的起始子帧。例如，Q＝3，即eDRS的前3个子帧携带子帧号，N为8，R也为8，那么第一DMTC窗口的子帧包括子帧0至子帧7，eDRS占用的起始子帧的最大子帧号可以为7，即第一DMTC窗口中的所有子帧都可以用于执行第一载波侦听。
针对N大于11-Q，则R小于或等于11-Q这种情况，也即，如果第一DMTC窗口的长度N大于11-Q，那么基站最多可以从第一DMTC窗口内一个无线帧的子帧0至子帧10-Q共11-Q个子帧执行第一载波侦听。例如Q为3，N为10时，基站可以执行第一载波侦听的子帧为第一DMTC窗口内的子帧0至子帧7。
可以看出，按照现有标准中规定DMTC窗口的长度小于或等于10的情况来说，无论第一DMTC窗口的长度N值为多少，基站在第一DMTC窗口内都最多有11-Q个子帧可以执行第一载波侦听。
举例来说，假设Q的值为3，eDRS占用的子帧数M为5，第一DMTC窗口长度N为10，那么基站在第一DMTC窗口内最多有8个子帧可以执行第一载波侦听，包括子帧0至子帧7。
针对N小于或等于8，比如N为6，如果执行第一载波侦听成功时的子帧号大于或等于0，小于或等于5，那么eDRS占用的子帧的子帧号的最大范围为子帧5至子帧9，包括第一DMTC窗口内的子帧5至子帧7以及第一DMTC窗口外的子帧8和子帧9。
按照上述eRDS的两种格式，在eDRS占用的子帧为子帧5至子帧9时，不会占用到现有DMTC窗口外的子帧0，eDRS占用的后M-Q个子帧，即后2个子帧的子帧格式可以不为1.0DRS，即后2个子帧的子帧格式可以均为1.1DRS，与1.0DRS的格式不同，此时eDRS的格式可以如图8a所示中的eDRS格式1，即eDRS的首子帧为1.0DRS，用于兼容现有的标准格式，其余4个子帧的格式可以均为1.1DRS。
如果执行第一载波侦听成功时的子帧号大于5且小于或等于7，即发送eDRS时占用的起始子帧的子帧号可能为6或7，那么无论第一DMTC窗口的长度N小于或等于8还是大于8，eDRS占用的5个子帧的第5个子帧或第4个子帧会占用到现有DMTC窗口外的子帧0。为了避免上述冲突，可以设定eDRS占用的后2个子帧中子帧0的格式为1.0DRS。如图8a所示，例如，如果发送eDRS时占用的起始子帧的子帧号为6，那么可以设定子帧6的格式为1.0DRS，子帧7至子帧9的格式为1.1DRS，现有 DMTC窗外的子帧0的格式为1.0DRS，如图8a中的eDRS格式2；如果发送eDRS时占用的起始子帧的子帧号为7，那么可以设定子帧7的格式为1.0DRS，子帧8和子帧9的格式为1.1DRS，现有DMTC窗外的子帧0的格式为1.0DRS，子帧1为1.1DRS，如图8a中的eDRS格式3。
对于UE来说，UE预先获知eDRS占用的子帧数M，当发送eDRS的前Q个子帧携带子帧号时，UE就可以推断出后M-Q个子帧占用的子帧号，从而确定出eDRS的子帧格式。
步骤803：若所述第一载波侦听失败，则所述基站针对所述第一DMTC窗口中一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听，或者，可选的，所述基站针对所述第一DMTC窗口中除前R个子帧之外的子帧执行第二载波侦听。
例如第一DMTC窗口的长度为N，基站针对第一DMTC窗口中一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听，也就是说若针对所述第一DMTC窗口在时序上的除前R个子帧之外的子帧执行的所述第二载波侦听成功，则所述基站在所述第一DMTC窗口中的一个子帧上发送发现信号，该发现信号仅占用一个子帧，可以为现有技术中的发现信号或者一种新的发现信号，这里不做具体限定。
若针对所述第一DMTC窗口在时序上的除前R个子帧之外的子帧执行的所述第二载波侦听失败，则基站无法第一DMTC窗口内获取发送机会，不发送发现信号。
其中，所述第二载波侦听成功代表基站确定第一信道空闲，可以用于发送发现信号。
若第一DMTC窗口包括多个无线帧，若所述第一载波侦听失败，基站可以针对所述第一DMTC窗口中一个无线帧除前R个子帧之外的子帧执行第二载波侦听。
一种可选的设计中，所述第二载波侦听用于确定是否可以在一个子帧上发送发现信号。具体的，所述第二载波侦听可以为第二级别的载波侦听，例如可以为上述cat.2 LBT，cat.2 LBT用于确定是否可以在一个子帧上发送DRS。
又一种可选的设计中，所述基站针对所述第一DMTC窗口中所述一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听具体包括：
所述基站先针对所述第一DMTC窗口中所述一个无线帧在时序上的除前R个子帧之外的子帧的第一个子帧执行第二载波侦听，若所述第二载波侦听失败，则所述基站继续针对时序上的除前R个子帧之外的子帧的下一个子帧执行第二载波侦听，若侦听成功，则在侦听成功的子帧上发送发现信号；否则继续针对时序上的再下一个子帧执行第二载波侦听。
这里需要说明的是，本申请实施例中的第一载波侦听和第二载波侦听不限于上述的记载。所述第一载波侦听和第二载波侦听可以在侦听时长、侦听方式、占用时长等中的一个或多个方面存在差别，上述级别可以也根据现有的不同侦听方式区分，例如，基于回退和非基于回退的侦听方式，具体的cat.4 LBT和cat.2 LBT属于不同的侦听级别，还可以根据侦听时长、侦听方式、占用时长等中的一个或多个值的差异定义，这里不做具体限定。例如，所述第一载波侦听可以为基于回退的CCA，如上述记载的cat.4 LBT，以便在第一载波侦听执行成功时发送占有连续多个子帧的发现信号；所述第二载波侦听可以为基于非回退的CCA，如上述记载的cat.2 LBT， 可以用于在侦听执行成功时发送仅占有一个子帧的发现信号。
这里还需要说明的是，本申请实施例中提到的针对一个子帧执行载波侦听(第一或第二载波侦听)，是指在所述一个子帧之前的一段时间内(即所述一个子帧时间上在前的上一个子帧中的一段时间内)，所述基站执行所述第一载波侦听或第二载波侦听，当满足相应的载波侦听条件时，侦听成功，则确定信道空闲，所述一个子帧可以用于发送信号。
这里需要说明的是，所述第一DMCT窗口内的任一个子帧都可以用于承载仅占用一个子帧的发现信号。
可以理解的是，eNB可以根据第一DMTC窗口的长度N和eDRS占用的子帧数M确定可以在第一DMTC窗口中一个无线帧内尝试执行Cat.4 LBT以发送eDRS的前R个子帧，或者根据第一DMTC窗口的长度N和发送eDRS时携带子帧号的子帧数量Q确定可以在第一DMTC窗口中一个无线帧内尝试执行Cat.4 LBT以发送eDRS的前R个子帧，如果eNB确定处于弱覆盖场景内的UE数量较少，不需要为了发送eDRS而在第一DMTC窗口内多次尝试执行Cat.4 LBT。一种可能的设计中，如果从第一DMTC起始位置开始一直执行Cat.4 LBT失败，则eNB可以在第一DMTC窗口内一个无线帧中前R个子帧的任一个子帧上停止执行Cat.4 LBT，并在第一DMTC窗口内所述一个无线帧中剩余的子帧上尝试执行Cat.2 LBT。另一种可能的设计中，eNB也可以在第一DMTC窗口内一个无线帧中前R个子帧的第1个子帧开始一直尝试执行Cat.2 LBT,成功之后在当前子帧发送DRS，如果此时仍未超出第一DMTC窗口内所述一个无线帧中前R个子帧范围，eNB可以继续尝试执行Cat.4 LBT，以在执行Cat.4 LBT成功时的子帧开始发送eDRS。再一种可选的设计中，用户设备(UE)在所述第一DMTC窗口中一个无线帧在时序上的前R个子帧中检测发现信号；所述发现信号承载于M个连续子帧上，所述M大于或等于2。
可选的，UE认为(consider)所述M个连续子帧的首子帧位于第一DMTC窗口中的一个无线帧中，所以UE在所述一个无线帧内前R个子帧中检测所述发现信号，若检测到，则所述UE在所述M个连续子帧上接收所述发现信号。
进一步可选的，在eDRS占用的M个子帧的前Q个子帧携带子帧号时，UE可以根据前Q个子帧的子帧号确定出eDRS的子帧格式。
进一步可选的，若所述UE在前R个子帧中并未检测到发现信号，则所述UE在所述第一DMTC窗口中所述一个无线帧在时序上的除前R个子帧之外的子帧继续检测发现信号，若能够检测到发现信号，则所述发现信号仅占用一个子帧。
再一种可选的设计中，所述R小于或等于N-M+1。
可选的，所述R的值等于N-M+1。
若所述基站在前R个子帧内一直进行第一载波侦听，直到针对第R个子帧的第一载波侦听成功，则所述基站从第R个子帧开始的M个子帧上发送发现信号，正好在所述第一DMTC窗内完成所述发现信号的发送。
可选的，所述R的值小于N-M+1。
若所述基站在前R个子帧内一直进行第一载波侦听，直到针对第R个子帧的第一载波侦听成功，则所述基站从第R个子帧开始的M个子帧上发送发现信号，发现信 号的长度不会超出所述第一DMCT窗口的长度。
例如，在一个DMTC窗口内，基站针对在时序上的前R个子帧执行第一载波侦听，若针对第R个子帧的第一载波侦听执行成功，则基站从所述第R个子帧开始发送发现信号，所述发现信号承载于所述M个连续子帧上。这里的第一载波侦听可以为基于回退的CCA，例如上述说明中介绍的cat.4LBT。也就是说，本申请实施例可以将第一DMTC窗口分为两部分，第一部分为时序上的前R个子帧，第二部分为时序上的除前R个子帧之外的子帧，使得基站针对第一部分进行第一载波侦听，以在所述第一载波侦听成功后，可以发送占有M个连续子帧的发现信号，在UE处于弱覆盖场景下，提升保证小区覆盖性能。对于所述发现信号来说，其起始子帧在所述第一部分的前R个子帧中，从而使得M个连续子帧的发送不会超出所述第一DMTC窗口。
又如，DMTC窗口的长度为N＝10ms，即包括10个子帧，DMTC窗口的周期可以为40ms。若发现信号在M＝6个连续子帧上发送，基站针对所述DMTC窗口内的前5个子帧执行第一载波侦听，例如Cat.4 LBT，这样，即使在时序上的第5个子帧才侦听成功，承载于6个连续子帧上的发现信号的发送不会超出所述DMTC窗口的长度；可选的，若在前5个子帧执行第一载波侦听均失败，则基站针对窗口内的后5个子帧执行第二载波侦听，例如Cat.2 LBT，因为后5个子帧不足以发送在6个连续子帧发送的发现信号。若所述第二载波侦听成功,则基站发送占有一个子帧的参考信号。又如DMTC窗口的周期可以为40ms，当到达下一个DMTC窗口时，基站又可以针对该下一个窗口内的子帧执行上述过程记载的相应的载波侦听。
再如，DMTC窗口的长度N为10ms，eDRS占用的子帧数为5，且eNB确定处于弱覆盖场景内的UE数量较少。如果eNB在子帧0之前执行Cat.4 LBT失败，eNB确定下一个子帧1的标识1小于5，那么继续在下一子帧1之前执行Cat.4 LBT，同理，如果对子帧2和子帧3执行Cat.4 LBT仍然失败，eNB确定下一子帧4之前执行Cat.2 LBT，而无需执行更多次的Cat.4 LBT。这里需要说明的是，eNB可以根据实际的通信场景和状况确定何时可以终止当前级别的载波侦听，而采用其他级别的载波侦听。
如图9所示，例如DMTC窗口的长度N为10ms，eDRS占用的子帧数为5，如果eNB在子帧0之前执行Cat.4 LBT失败，eNB确定下一个子帧1的标识1小于5，那么继续在下一子帧1之前执行Cat.4 LBT，同理，如果经过子帧2和子帧3，直至子帧4时执行Cat.4 LBT失败，eNB确定下一子帧5的标识5等于N-M的值5，那么eNB仍然在子帧5之前执行Cat.4 LBT，如果在子帧5之前执行Cat.4 LBT成功，那么eNB可以从子帧5开始发送eDRS，eDRS的发送此时占用子帧5至子帧9。如果在子帧5之前执行Cat.4 LBT失败，eNB确定下一子帧R+1对应的值6大于N-M的值5，那么eNB在下一子帧6之前执行Cat.2 LBT，如果在子帧6之前执行Cat.2 LBT成功，eNB在子帧6发送DRS，如果在子帧6之前执行Cat.2 LBT失败，那么eNB在子帧7之前继续执行Cat.2 LBT。
通过新的发现信号测量定时配置，支持增强发现信号的传输以实现UE在弱覆盖场景下进行接入，保证小区的覆盖性能。假如eDRS的信号格式为一种标准格式，例如上述阐述中提及的eDRS的首子帧为1.0DRS，其余子帧为1.1DRS，则可以保证发送eDRS占用的子帧在一个无线帧内，不会遇到现有标准中规定的DMTC窗口之外的 任何一个子帧0。因为在现有标准中，在DMTC窗外的子帧0是下行子帧时，该子帧0必须为1.0DRS，与eDRS产生冲突。另一方面，为了不与现有标准产生冲突，可以根据eDRS占用的子帧数和携带子帧号的子帧数为eDRS定义多种格式，可以使得UE根据子帧号确定出eNB发送的是哪一种格式的eDRS，UE可以根据确定出的格式检测eDRS。也即，如果本申请配置的第一DMTC窗口能够使得eDRS的发送在DMTC窗口中的一个无线帧内，那么eDRS的信号格式就可以为一种标准格式，UE可以按照eDRS的标准格式接收到eDRS，如果eDRS发送所占用的子帧属于DMTC窗口内的多个无线帧，可以设定eDRS的子帧格式，降低eNB和UE的实现复杂度。
在另一种可能的设计中，本申请配置的第一DMTC窗口和现有的DMTC窗口的起始位置可以相同，均是从子帧0开始。本申请配置的第一DMTC窗口用于确认是否执行第一载波侦听。在本申请实施例中，可以根据本申请配置的第一DMTC窗口的长度N和eDRS占用的子帧数M确定可以用于执行第一载波侦听的一个无线帧内子帧数R的范围。
如果eDRS占用的子帧数为M，那么本申请配置的第一DMTC窗口的长度可以小于或等于11-M，也可以大于11-M，R最大可以为11-M，可以使得发送eDRS时占用的子帧在一个无线帧内，如果eDRS占用的子帧的前Q个子帧携带子帧号，那么R最大可以为11-Q，可以使得即使eDRS占用的子帧属于多个无线帧，UE也可以根据前Q个子帧携带的子帧号确定出eDRS的发送格式。
这样，本申请配置的第一DMTC窗口的配置参数可以配置如下：表示第一DMTC窗口的周期的参数dmtc-Periodicity-mf例如可以为40ms、80ms、160ms等，表示第一DMTC窗口的起始子帧的参数dmtc-Offset-mf可以按照周期选择，例如周期参数为160ms时，起始子帧的位置可以为子帧0至子帧159中的任一位置；表示周期内第一DMTC窗口长度的参数dmtc-WindowSize-mf可以为1至11-M中的任一值，或者如果M个连续子帧中的前Q个子帧携带有子帧号，表示第一DMTC窗口长度的参数dmtc-WindowSize-mf可以为1至11-Q中的任一值。
也就是说，第一DMTC窗口的长度可以大于或等于1，且小于或等于11-M，或，第一DMTC窗口的长度可以大于或等于1，且小于或等于11-Q，只要在第一DMTC窗口内执行Cat.4 LBT成功，那么可以从执行Cat.4 LBT成功时的子帧开始发送eDRS。那么上述步骤801中eNB执行第一载波侦听，可以理解为eNB在第一DMTC窗口的一个无线帧中执行第一载波侦听，或者eNB在第一DMTC窗口之前执行第一载波侦听，以确定第一DMTC窗口的首子帧是否可用。上述步骤801中的eNB执行第一载波侦听，可以是eNB在第一DMTC窗口的一个无线帧中的子帧之前执行Cat.4 LBT，例如在子帧0之前执行Cat.4 LBT，若在子帧0之前执行Cat.4 LBT成功，则eNB从子帧0开始占用子帧0至子帧4发送eDRS，若在第一DMTC窗口中子帧0之前执行Cat.4 LBT失败，则在下一子帧之前继续执行Cat.4 LBT，一旦在某个子帧R之前执行Cat.4 LBT失败，例如在第一DMTC窗口中的子帧5执行Cat.4 LBT失败，那么eNB在子帧6，即现有技术配置的DMTC窗口的子帧6之前尝试执行Cat.2 LBT，如果在子帧6之前执行Cat.2LBT成功，就在子帧6发送DRS。也就是说，第一DMTC窗口的长度为6，即从子帧0到子帧5，起始子帧为0，如图10所示，eNB能够在第一DMTC窗口内执 行Cat.4 LBT尝试发送eDRS，如果不成功，则可以在现有DMTC窗口剩余的机会内执行Cat.2 LBT尝试发送DRS。
再一种可选的设计中，第一DMTC窗口长度也可以超过11-Q，即第一DMTC窗口包括的N个子帧的N值也可以大于11-Q，但是允许的发送eDRS的机会为第一DMTC窗口中一个无线帧在时序上的前11-Q个子帧，即M个连续子帧中的起始子帧在所述一个无线帧中的前11-Q个子帧中。举例来说，第一DMTC可以配置如下：表示第一DMTC窗口的周期的参数dmtc-Periodicity-mf例如可以为40ms、80ms、160ms等，表示第一DMTC窗口的起始子帧的参数dmtc-Offset-mf可以按照周期选择，例如周期参数为160ms时，起始子帧的位置可以为子帧0至子帧159中的任一位置；表示周期内第一DMTC窗口长度的参数dmtc-WindowSize-mf可以为1至16中的任一值，例如第一DMTC窗口长度为16ms，包括周期内一个完整无线帧的10个子帧，以及下一个无线帧的一部分，也即下一个无线帧时序上的前6个子帧。若eDRS占用的子帧数M为5，且前3个子帧携带子帧号，则基站只能在一个无线帧的前11-3个子帧，即子帧0到子帧7尝试执行Cat.4 LBT，如果在子帧0到子帧7的第R个子帧执行Cat.4 LBT成功，则基站在相应的第R个子帧上开始发送eDRS。
这样一来，本申请配置的第一DMTC窗口，可以在第一DMTC窗口内支持第一载波侦听即Cat.4 LBT的发送，可选的，如果第一DMTC窗口内执行Cat.4 LBT都失败，则在第一DMTC窗口中一个无线帧除时序上的前R个子帧以外剩余的子帧内尝试执行Cat.2 LBT，以便于DRS的发送，这样在第一DMTC窗口的配置下，eNB可以获取eDRS以及DRS的发送机会，保证小区的覆盖性能，且发送eDRS时占用的子帧不会超出一个无线帧，按照上述阐述，eDRS的信号格式可以为一种标准格式，使得UE可以按照eDRS的标准格式接收到eDRS，或者即使发送eDRS时占用的子帧属于多个无线帧，也可以根据eDRS占用的前Q个子帧携带子帧号来确定eDRS的发送格式，以便UE可以按照相应的格式来接收eDRS。
上述主要从基站的角度对本申请实施例提供的方案进行了介绍。可以理解的是，基站为了实现上述功能，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，本申请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申请的范围。
本申请实施例可以根据上述方法示例对基站进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
在采用集成的单元的情况下，图11示出了上述实施例中所涉及的基站的一种可能的结构示意图。基站1100包括：存储模块1101、处理模块1102、接收模块1103和发送模块1104。处理模块1102用于对基站的动作进行控制管理，接收模块1103 和发送模块1104用于支持基站与其他网络实体的通信，例如与UE之间的通信，存储模块1101，用于存储基站的程序代码和数据。
在本申请实施例中，接收模块1103，用于针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧执行第一载波侦听；处理模块1102，用于确定第一载波侦听是否成功，若第一载波侦听成功，发送模块1104用于在M个连续子帧上发送发现信号，M大于或等于2，M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中；其中，M和R均为自然数。
在一种可能的设计中，第一DMTC窗口包含N个子帧，若N小于或等于11-M，则R小于或等于N；或者，若N大于11-M，则R小于或等于11-M。
在一种可能的设计中，M个连续子帧的每个子帧上承载的发现信号可以相同或不同。
在一种可能的设计中，第一DMTC窗口包含N个子帧，M个连续子帧中的前Q个子帧携带子帧号，Q小于或等于M；其中，若N小于或等于11-Q，则R小于或等于N；或者，若N大于11-Q，则R小于或等于11-Q。
在一种可能的设计中，在基站发送发现信号之前，基站根据前Q个子帧的子帧号确定M个连续子帧上的发现信号的格式。
在一种可能的设计中，若第一载波侦听失败，则接收模块1103用于针对第一DMTC窗口中一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听，或者基站针对第一DMTC窗口中除前R个子帧之外的子帧执行第二载波侦听。
在一种可能的设计中，若第二载波侦听成功，则发送模块1104在第一DMTC窗口中的一个子帧上发送发现信号。
在一种可能的设计中，第一DMTC窗口包含N个子帧，若N小于或等于11-Q，则M个连续子帧中的起始子帧在N个子帧中；或者，若N大于11-Q，则M个连续子帧中的起始子帧在一个无线帧中的前11-Q个子帧中，M个连续子帧中的前Q个子帧携带子帧号。
在一种可能的设计中，第一DMTC窗口包含一个或多个无线帧，或者一个无线帧的一部分。
结合上述方法实施例，例如，接收模块1103用于支持基站执行图8中的过程801和803，和/或用于本文所描述的技术的其它过程，发送模块1104用于支持基站执行图8中802,和/或用于本文所描述的技术的其它过程，处理模块1102用于支持基站确定第一载波侦听成功或失败。存储模块1101，用于存储基站用于执行上述过程801-803的程序代码和数据。
其中，处理模块1102可以是处理器或控制器，例如可以是中央处理器(Central Processing Unit，CPU)，通用处理器，数字信号处理器(Digital Signal Processor，DSP)，专用集成电路(Application-Specific Integrated Circuit，ASIC)，现场可编程门阵列(Field Programmable Gate Array，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申请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。收发模 块1303可以是收发器、收发电路或通信接口等。存储模块1101可以是存储器。
当处理模块1102为处理器，发送模块1104为发射器，接收模块1103为接收器收发器，存储模块1101为存储器时，本申请实施例所涉及的基站可以为图12所示的基站。
参阅图12所示，该基站1201包括：处理器1212、发射器1213、存储器1211、总线1214以及接收器1215。其中，发射器1213、处理器1212、接收器1215以及存储器1211通过总线1214相互连接；总线1214可以是外设部件互连标准(Peripheral Component Interconnect，PCI)总线或扩展工业标准结构(Extended Industry Standard Architecture，EISA)总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图12中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
在本申请实施例中，接收器1215可以用于针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧中执行第一载波侦听；若第一载波侦听成功，则发射器1213用于在M个连续子帧上发送发现信号，M大于或等于2，M个连续子帧的第一个子帧位于第一DMTC窗口中的一个无线帧中。
其中，M和R均为自然数。
在一种可能的设计中，第一DMTC窗口包含N个子帧；若N小于或等于11-M，则R小于或等于N；或者，若N大于11-M，则R小于或等于11-M。
在一种可能的设计中，M个连续子帧的每个子帧上承载的发现信号可以相同或不同。
在一种可能的设计中，第一DMTC窗口包含N个子帧；M个连续子帧中的前Q个子帧携带子帧号；Q小于或等于M；其中，若N小于或等于11-Q，则R小于或等于N；或者，若N大于11-Q，则R小于或等于11-Q。
在一种可能的设计中，在基站发送发现信号之前，基站根据前Q个子帧的子帧号确定M个连续子帧上的发现信号的格式。
在一种可能的设计中，若第一载波侦听失败，则接收器1215用于针对第一DMTC窗口中一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听，或者基站针对第一DMTC窗口中除前R个子帧之外的子帧执行第二载波侦听。
在一种可能的设计中，若第二载波侦听成功，则发射器1213用于在第一DMTC窗口中的一个子帧上发送发现信号。
在一种可能的设计中，第一DMTC窗口包含N个子帧，若N小于或等于11-Q，则M个连续子帧中的起始子帧在N个子帧中；或者，若N大于11-Q，则M个连续子帧中的起始子帧在一个无线帧中的前11-Q个子帧中，M个连续子帧中的前Q个子帧携带子帧号。
在一种可能的设计中，第一DMTC窗口包含一个或多个无线帧，或者一个无线帧的一部分。
结合上述方法实施例，例如，例如，接收器1215用于支持基站执行图8中的过程801和803，和/或用于本文所描述的技术的其它过程，发射器1213用于支持基站执行图8中802,和/或用于本文所描述的技术的其它过程，处理器1212用于支持基 站确定第一载波侦听成功或失败。存储器1211，用于存储基站用于执行上述过程801-803的程序代码和数据。
结合本申请公开内容所描述的方法或者算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随机存取存储器(Random Access Memory，RAM)、闪存、只读存储器(Read Only Memory，ROM)、可擦除可编程只读存储器(Erasable Programmable ROM，EPROM)、电可擦可编程只读存储器(Electrically EPROM，EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(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ASIC中。另外，该ASIC可以位于核心网接口设备中。当然，处理器和存储介质也可以作为分立组件存在于核心网接口设备中。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本申请所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上所述的具体实施方式，对本申请的目的、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，以上所述仅为本申请的具体实施方式而已，并不用于限定本申请的保护范围，凡在本申请的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本申请的保护范围之内。

Claims (28)

  1. 一种发现信号的发送方法，其特征在于，包括：
    基站针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧执行第一载波侦听；
    若所述第一载波侦听成功，则所述基站在M个连续子帧上发送发现信号，所述M大于或等于2，所述M个连续子帧的第一个子帧位于所述第一DMTC窗口中的所述一个无线帧中；
    其中，所述M和R均为自然数。
  2. 根据权利要求1所述的方法，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    若N小于或等于11-M，则所述R小于或等于N；或者
    若N大于11-M，则所述R小于或等于11-M。
  3. 根据权利要求1或2所述的方法，其特征在于：
    所述M个连续子帧的每个子帧上承载的发现信号可以相同或不同。
  4. 根据权利要求1所述的方法，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    所述M个连续子帧中的前Q个子帧携带子帧号，所述Q小于或等于M；
    其中，若N小于或等于11-Q，则所述R小于或等于N；或者
    若N大于11-Q，则所述R小于或等于11-Q。
  5. 根据权利要求4所述的方法，其特征在于，所述方法还包括：
    在所述基站发送所述发现信号之前，所述基站根据所述前Q个子帧的子帧号确定所述M个连续子帧上的发现信号的格式。
  6. 根据权利要求1所述的方法，其特征在于：
    若所述第一载波侦听失败，则所述基站针对所述第一DMTC窗口中所述一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听，或者所述基站针对所述第一DMTC窗口中除前R个子帧之外的子帧执行第二载波侦听。
  7. 根据权利要求6所述的方法，其特征在于：
    若所述第二载波侦听成功，则所述基站在所述第一DMTC窗口中的一个子帧上发送发现信号。
  8. 根据权利要求1的方法，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    若N小于或等于11-Q，则所述M个连续子帧中的起始子帧在所述N个子帧中；或者，若N大于11-Q，则所述M个连续子帧中的起始子帧在所述一个无线帧中的前11-Q个子帧中；其中，所述M个连续子帧中的前Q个子帧携带子帧号。
  9. 根据权利要求1-8任一项所述的方法，其特征在于：
    所述第一DMTC窗口包含一个或多个无线帧，或者一个无线帧的一部分。
  10. 一种发现信号检测方法，其特征在于：
    用户设备UE在第一发现信号测量定时DMTC窗口中的一个无线帧的前R个子帧中检 测发现信号，所述发现信号承载于M个连续子帧上，所述M大于或等于2；
    其中，所述M个连续子帧的第一个子帧位于所述第一DMTC窗口中的所述一个无线帧中,所述M和R均为自然数。
  11. 根据权利要求10所述的方法，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    若N小于或等于11-M，则所述R小于或等于N；或者
    若N大于11-M，则所述R小于或等于11-M。
  12. 根据权利要求10所述的方法，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    所述M个连续子帧中的前Q个子帧携带子帧号，所述Q小于或等于M；
    其中，若N小于或等于11-Q，则所述R小于或等于N；或者
    若N大于11-Q，则所述R小于或等于11-Q。
  13. 根据权利要求12所述的方法，其特征在于，所述方法还包括：
    所述UE根据所述前Q个子帧的子帧号确定所述M个连续子帧的格式。
  14. 一种基站，包括接收器和发射器，其特征在于：
    所述接收器用于针对第一发现信号测量定时DMTC窗口中一个无线帧在时序上的前R个子帧中执行第一载波侦听；
    若所述第一载波侦听成功，则所述发射器用于在M个连续子帧上发送发现信号，所述M大于或等于2，所述M个连续子帧的第一个子帧位于所述第一DMTC窗口中的所述一个无线帧中；
    其中，所述M和R均为自然数。
  15. 根据权利要求14所述的基站，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    若N小于或等于11-M，则所述R小于或等于N；或者
    若N大于11-M，则所述R小于或等于11-M。
  16. 根据权利要求14或15所述的基站，其特征在于：
    所述M个连续子帧的每个子帧上承载的发现信号可以相同或不同。
  17. 根据权利要14所述的基站，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    所述M个连续子帧中的前Q个子帧携带子帧号，所述Q小于或等于M；
    若N小于或等于11-Q，则所述R小于或等于N；或者
    若N大于11-Q，则所述R小于或等于11-Q。
  18. 根据权利要17所述的基站，其特征在于，还包括处理器：
    在所述发射器用于发送所述发现信号之前，所述处理器用于根据所述前Q个子帧携带的子帧号确定所述M个连续子帧上的发现信号的格式。
  19. 根据权利要求14所述的基站，其特征在于：
    若所述第一载波侦听失败，则所述接收器用于针对所述第一DMTC窗口中的所述一个无线帧在时序上的除前R个子帧之外的子帧执行第二载波侦听，或者所述接收器针对所述第一DMTC窗口中除前R个子帧之外的子帧执行第二载波侦听。
  20. 根据权利要求19所述的基站，其特征在于：
    若所述第二载波侦听成功，则所述发射器用于在所述第一DMTC窗口中的一个子帧上发送发现信号。
  21. 根据权利要求14所述的基站，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    若N小于或等于11-Q，则所述M个连续子帧中的起始子帧在所述N个子帧中；或者，若N大于11-Q，则所述M个连续子帧中的起始子帧在所述一个无线帧中的前11-Q个子帧中；
    其中，所述M个连续子帧中的前Q个子帧携带子帧号。
  22. 根据权利要求14-21任一项所述的基站，其特征在于：
    所述第一DMTC窗口包含一个或多个无线帧，或者一个无线帧的一部分。
  23. 一种用户设备(UE)，包括接收器和发射器，其特征在于：
    所述接收器用于在第一发现信号测量定时DMTC窗口中的一个无线帧的前R个子帧中检测发现信号；所述发现信号承载于M个连续子帧上，所述M大于或等于2；
    其中，所述M个连续子帧的第一个子帧位于所述第一DMTC窗口中的所述一个无线帧中,所述M和R均为自然数。
  24. 根据权利要求23所述的UE，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    若N小于或等于11-M，则所述R小于或等于N；或者
    若N大于11-M，则所述R小于或等于11-M。
  25. 根据权利要求23所述的UE，其特征在于：
    所述第一DMTC窗口包含N个子帧；
    所述M个连续子帧中的前Q个子帧携带子帧号，所述Q小于或等于M；
    其中，若N小于或等于11-Q，则所述R小于或等于N；或者
    若N大于11-Q，则所述R小于或等于11-Q。
  26. 根据所述权利要求25所述的UE，其特征在于：
    所述接收器用于接收所述发现信号；
    所述UE还包括处理器，用于根据所述前Q个子帧的子帧号确定所述M个连续子帧的格式。
  27. 一种计算机可读存储介质，其上存储有计算机程序，其特征在于，该程序被处理器执行时实现权利要求1-13任一项所述的方法。
  28. 一种计算机程序产品，当其在计算机上运行时，使得计算机执行如权利要求1-13任一项所述的方法。
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CN110622591A (zh) 2019-12-27

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