CN107181561A - Sending method, the detection method and device of synchronizing signal - Google Patents
Sending method, the detection method and device of synchronizing signal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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Abstract
The present embodiments relate to the sending method of synchronizing signal, detection method and device, the detection method of the synchronizing signal includes：It is determined that the state being presently in, the state includes the just state of upper electricity or is just converted to wake-up states or connected state from resting state；And/or, it is determined that the covering grade of ownership, the covering grade includes nearly covering grade or remote covering grade；According to the state being presently in and/or the covering grade of ownership of determination, selection receives according to first method or second method and detects synchronizing signal；The first method includes including a synchronous signal receiver according to each subframe and detects synchronizing signal；The second method includes including multiple synchronous signal receiver according to each subframe and detects synchronizing signal.Therefore, in the embodiment of the present invention, it can make far to cover terminal Fast synchronization.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting and detecting a synchronization signal.
Background
Machine to machine (M2M) technology is a technology for transmitting information and data between machines and each other through a wireless network, and is an important direction for the next development of mobile communication. The concept of M2M was first introduced in 1999 by auto.id laboratory, university of massachusetts, usa. The intelligent monitoring system is widely applied to multiple fields including intelligent transportation, building control systems, household intelligent control systems, video monitoring systems, industrial monitoring and the like. The internet of things industry is considered as the fourth wave of information industry after computers, internet and mobile communication networks, and is the development direction of future networks.
The M2M intersystem physical channels include a synchronization channel, a broadcast channel, a control channel, a data channel, and the like. The terminal equipment determines the time and frequency of the signal transmitted by the base station through the synchronous channel to calibrate the local time frequency offset.
Some terminal devices in communication of the M2M system are located at the edge of a large coverage cell or at a deep fading position, which results in poor signal quality received by the terminal devices, and the base station needs to repeatedly send the same signal for multiple times to enable the terminal devices to obtain energy accumulation, so as to improve the signal reception quality of the terminal devices. And for terminal equipment which is close to the base station or the control center, the signal quality is better, and the base station or the control center is not required to repeatedly send signals for many times.
In the prior art, a base station, an access node, or a control node transmits a synchronization signal at a fixed time interval, and a terminal device accumulates signal energy at the same time interval to detect the synchronization signal. The number of detections of the terminal device increases with the decrease of the channel quality.
According to the laws and regulations, the time for the internet of things system to occupy the channel is limited every time, and the signal transmission is required to be stopped after a certain time signal is transmitted to make the channel. If the terminal device does not finish communication with the base station within one channel occupation time, the terminal device needs to monitor when the base station re-preempts the channel to continue communication, and the far-coverage terminal device with poor channel quality needs to detect for multiple times to finish synchronization, so the synchronization time is long. The time length of each occupied frequency band in the unlicensed frequency band system is limited, and if the far-coverage terminal device spends a long time detecting the synchronization signal, the time available for transmitting the data information is relatively reduced. In order to be able to better exploit the time of channel preemption each time to transmit more information, it is necessary to synchronize all terminal devices, especially far-coverage terminal devices, within the system quickly.
Disclosure of Invention
The embodiment of the invention provides a sending method, a detection method and a device of a synchronization signal, which can enable a far-coverage terminal to be quickly synchronized.
In one aspect, a method for detecting a synchronization signal is provided, where the method includes:
determining the current state, wherein the state comprises a state of just powering on or a state of just switching from a sleep state to a wake-up state or a connection state; and/or the presence of a gas in the gas,
determining a coverage level of a home, the coverage level comprising a near coverage level or a far coverage level;
according to the determined current state and/or the coverage grade of the attribution, selecting to receive and detect the synchronous signals according to a first mode or a second mode;
the first mode includes receiving and detecting a synchronization signal including a synchronization signal once per subframe;
the second mode includes receiving and detecting a synchronization signal including a plurality of times per subframe.
As can be seen from the above, in the embodiment of the present invention, when receiving a synchronization signal, a terminal device selects to receive and detect a synchronization signal according to a state of the terminal device and/or an attributive coverage level, instead of receiving and detecting a synchronization signal in a fixed manner, where each subframe includes a synchronization signal once or each subframe includes multiple times of synchronization signals, so that it is possible to avoid that a far-coverage terminal device cannot perform fast synchronization, and energy consumption of the terminal device is saved on the premise that the far-coverage terminal device performs fast synchronization.
In one possible design, the selecting to receive and detect the synchronization signal according to the first mode or the second mode according to the determined current state includes:
when the determined current state is a state of just powering on or just switching from a sleep state to an awakening state, selecting to receive and detect a synchronous signal according to a first mode; or
And when the determined current state is the connection state, selecting to receive and detect the synchronous signal according to the second mode.
As can be seen from the above, in the embodiments of the present invention, the manner in which the terminal device receives and detects the synchronization signal may be determined according to the state of the terminal device, and because the channel resources are limited, the base station only sends the synchronization signal multiple times in each subframe of the first predetermined number of subframes within the channel occupation time, and sends the synchronization signal once in each subframe of the remaining subframes, that is, the ratio of sending the synchronization signal once in each subframe is higher. When the terminal equipment is in a state of being just powered on or just switched from a dormant state to an awakening state, because the ratio of sending the primary synchronous signal by the current subframe is higher, receiving and detecting the synchronous signal according to the fact that each subframe contains the primary synchronous signal; when the terminal equipment is in a connection state, the current sub-frame has a plurality of first sub-frames which are more likely to be the beginning of the channel occupation time, and each sub-frame is selected to contain a plurality of times of synchronous signal receiving and synchronous signal detection. The method can select a proper mode for receiving and detecting the synchronous signal through the state of the terminal, thereby saving the energy consumption of the terminal equipment on the premise of meeting the requirement of fast synchronization of the remote coverage terminal equipment.
In one possible design, the selecting to receive and detect the synchronization signal according to the first mode or the second mode according to the determined coverage level of the attribution comprises:
when the determined coverage grade of the attribution is a near coverage grade, selecting to receive and detect the synchronous signal according to a first mode; or
And when the determined coverage grade of the attribution is a far coverage grade, selecting to receive and detect the synchronous signal according to the second mode.
Therefore, in the embodiment of the invention, the method for receiving and detecting the synchronization signal by the terminal equipment can be determined according to the coverage grade of the terminal equipment, so that the quick synchronization of the far-coverage terminal equipment can be effectively ensured, and the energy consumption of the near-coverage terminal equipment can be saved.
In one possible design, the selecting to receive and detect the synchronization signal according to the first mode or the second mode according to the determined current state and/or the coverage level of the home includes:
when the determined home coverage level is a near coverage level and the determined current state is a state of just powering on or a state of just switching from a sleep state to an awake state, or when the determined home coverage level is a far coverage level and the determined current state is a state of just powering on, selecting to receive and detect the synchronization signal according to a first mode;
and when the determined coverage grade of the attribution is a near coverage grade and the determined current state is a connected state, or when the determined coverage grade of the attribution is a far coverage grade and the determined current state is a connected state or just transits from a dormant state to an awakened state, selecting to receive and detect the synchronous signal according to the second mode.
Therefore, in the embodiment of the invention, the mode of receiving and detecting the synchronization signal by the terminal equipment can be determined according to the coverage grade of the terminal equipment and the state of the terminal equipment, so that the energy consumption of the terminal equipment can be saved to the maximum extent on the premise of effectively ensuring the quick synchronization of the far-coverage terminal equipment.
In one possible design, after selecting to receive and detect the synchronization signal in the first manner, the method further includes:
acquiring a frame number and a subframe number through the detected synchronous signal;
after selecting to receive and detect the synchronization signal according to the second mode, the method further comprises: and acquiring the time slot number through the detected synchronous signal.
Therefore, in the embodiment of the invention, when the base station sends the synchronous signal once in one subframe, the terminal equipment can acquire the frame number and the subframe number through the detected synchronous signal, and when the base station sends different synchronous signals for many times in one subframe, the terminal equipment can acquire the time slot number through the detected synchronous signal, so that the terminal equipment can stop detection after detecting the synchronous signal, and the quick synchronization of the far-coverage terminal equipment is effectively ensured.
In one possible design, the selecting to receive and detect the synchronization signal in the second manner includes:
if the synchronous signals sent by the base station in a subframe are different, stopping detection after the synchronous signals are detected;
if the synchronous signals sent by the base station in one subframe are the same, the synchronous signals are detected, and then the synchronous signals are detected continuously until the detected synchronous signals are different from the synchronous signals detected last time, and the detection is stopped.
Therefore, in the embodiment of the present invention, the terminal device first determines whether the multiple synchronization signals sent by the base station in one subframe are the same synchronization signal or different synchronization signals, and accordingly adopts a suitable detection means, thereby effectively improving the success rate of synchronization and avoiding synchronization failure.
In another aspect, a method for transmitting a synchronization signal is provided, the method including:
if the current sub-frame does not belong to the first preset number of sub-frames in the occupied time of the channel, a primary synchronization signal is sent in the current sub-frame; or,
and if the current subframe belongs to the first preset number of subframes in the occupied time of the channel, transmitting the synchronous signal for multiple times in the current subframe.
As can be seen from the above, in the embodiment of the present invention, the base station, the control node, or the access node does not transmit the synchronization signal in each subframe in a fixed manner, but considers the synchronization time of the near coverage terminal device and the far coverage terminal device, and transmits the synchronization signal for multiple times only in the first predetermined number of subframes within the channel occupation time, and transmits the synchronization signal for one time in the remaining subframes, on one hand, the requirement of fast synchronization of the far coverage terminal device is satisfied, and on the other hand, channel resources can be effectively saved.
In one possible design, the transmitting the synchronization signal once in the current subframe includes:
sending a synchronous signal once in the current subframe, wherein the synchronous signal is used for indicating the frame number and the subframe number of the current subframe; or,
the transmitting the multiple synchronization signals in the current subframe includes:
sending different synchronous signals for many times in the current subframe, wherein the synchronous signals are used for indicating the time slot number of the time slot in which the synchronous signals are positioned; or,
the same synchronization signal is transmitted multiple times in the current subframe.
As can be seen from the above, in the embodiment of the present invention, a base station, an access node, or a control node may send a synchronization signal once in a current subframe, where the synchronization signal is used to indicate a frame number and a subframe number of the current subframe; or, different synchronization signals are sent for many times in the current subframe, and the synchronization signals are used for indicating the time slot number of the time slot in which the synchronization signals are located, so that the terminal equipment can stop detection after detecting the synchronization signals, and the requirement of the terminal equipment on quick synchronization is met. In addition, the base station or the access node or the control node can also transmit the same synchronization signal for multiple times in the current subframe, so that the synchronization signal can be multiplexed, and the identification of the synchronization signal is simplified.
On the other hand, an embodiment of the present invention provides a device for detecting a synchronization signal, where the device has a function of implementing a behavior of a synchronization signal detecting party in the foregoing method embodiment, and the function may be implemented by hardware or by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions.
On the other hand, an embodiment of the present invention provides a device for sending a synchronization signal, where the device has a function of implementing a behavior of a sender of the synchronization signal in the foregoing method embodiment, and the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions.
On the other hand, an embodiment of the present invention provides a terminal device, where the terminal device has a function of implementing a behavior of a synchronization signal receiver in the above method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In one possible design, the terminal device includes a processor and a receiver in the structure, and the processor is configured to support the terminal device to perform the corresponding functions in the above method. The receiver is used for supporting communication between the terminal equipment and the base station or the control node or the access node, and receiving information or instructions such as the synchronization signal and the like sent by the base station or the control node or the access node. The terminal device may also include a memory for coupling with the processor that retains program instructions and data necessary for the terminal device.
In another aspect, an embodiment of the present invention provides a base station, a control node, or an access node, where the base station, the control node, or the access node has a function of implementing a synchronization signal sender behavior in the above method design. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions. The modules may be software and/or hardware.
In one possible design, a base station or control node or access node may be configured to include a transmitter configured to support various instructions, such as the base station or control node or access node, to transmit synchronization signals, and a processor. And the processor controls the base station or the control node or the access node to select a corresponding mode to transmit the synchronous signal in each subframe.
In still another aspect, an embodiment of the present invention provides a communication system, where the communication system includes the base station, the control node, or the access node and the terminal device described in the above aspect.
In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for the terminal device, which includes a program designed to execute the above aspects.
In yet another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for the base station, the control node, or the access node, which includes a program designed to execute the above aspects.
Compared with the prior art, in the embodiment of the invention, when receiving the synchronization signal, the terminal device selects to receive and detect the synchronization signal according to the state and/or the coverage level of the terminal device, wherein each subframe contains the synchronization signal once or each subframe contains the synchronization signal for multiple times, instead of receiving and detecting the synchronization signal in a fixed mode, so that the energy consumption of the terminal device can be saved on the premise of meeting the requirement of fast synchronization of the far-coverage terminal device. The base station, the control node or the access node does not transmit the synchronous signals according to a fixed time interval, but transmits the synchronous signals for a plurality of times in the first preset number of subframes in the occupied time of the channel and transmits the synchronous signals for one time in the rest subframes, thereby being capable of quickly synchronizing the far-coverage terminal equipment and considering the synchronous time of the near-coverage user.
Drawings
Fig. 1 is a schematic view of an application scenario based on which a method for sending and detecting a synchronization signal according to an embodiment of the present invention is provided;
fig. 2 is a flowchart of a method for sending a synchronization signal according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for detecting a synchronization signal according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a synchronization signal in a normal subframe according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a synchronization signal in a preamble subframe according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a synchronization signal in another preamble subframe according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a synchronization signal in a preamble subframe according to another embodiment of the present invention;
FIG. 8 is a diagram showing the frame structure within each COD;
fig. 9 is a structural diagram of a device for detecting a synchronization signal according to an embodiment of the present invention;
fig. 10 is a structural diagram of a synchronization signal transmitting apparatus according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention.
Although the foregoing background section uses the M2M System as an example, it should be understood by those skilled in the art that the present invention is not limited to the M2M System, but can be applied to other wireless Communication systems, such as Long Term Evolution (LTE) System, Global System for Mobile communications (GSM) System, Mobile Communication System (UMTS), Code Division Multiple Access (CDMA) System, new network System, and the like. The following description of the specific embodiment is made by taking the M2M system as an example.
The terminal device according to the embodiments of the present invention may be a device providing voice and/or data connectivity to a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN), which may exchange language and/or data with the RAN. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User agent (User agent), a User Device (User Device), or a User Equipment (User Equipment).
The network device for transmitting the synchronization signal according to the embodiments of the present invention may be a base station, an access point, or a device in an access network that communicates with a wireless terminal through one or more sectors over an air interface. The base station may be configured to interconvert received air frames and IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate management of attributes for the air interface. For example, the Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, or an evolved Node B (eNB or e-NodeB) in LTE, and the present application is not limited thereto.
In the embodiment of the present invention, the sending method of the synchronization signal may be applied to a base station, a control node, or an access node, and for convenience of description, the base station is taken as an example to illustrate the sending method of the synchronization signal, and the detecting method of the synchronization signal may be applied to a terminal device communicating with the base station, the control node, or the access node.
In the communication process of the base station and the terminal equipment, the base station sends synchronous signals in different subframes according to different time intervals, sends the synchronous signals once in a first type of subframe, and sends the synchronous signals for multiple times in a second type of subframe. The first type of subframe may specifically be a normal subframe with data transmission, and this type of subframe is generally referred to as a normal (normal) subframe, and the second type of subframe may specifically be a first predetermined number of subframes, for example, a first subframe, which are sent after the base station preempts the channel each time, and this type of subframe is generally referred to as a preamble subframe. In a specific embodiment of the present invention, the synchronization signal is transmitted only once in the normal subframe, and the synchronization signal is transmitted a plurality of times in succession in the first subframe transmitted after each channel preemption. The same synchronization sequence may be used in the normal subframe and the preamble subframe, where the same synchronization sequence indicates the subframe number and the frame number in the normal subframe and the slot number in the preamble subframe.
The terminal equipment receives the synchronous signals according to different time intervals according to different states and/or different coverage levels. And the terminal equipment determines the resource positions occupied by the broadcast signals, the control signals and the data signals in the received signals according to the read synchronous information.
Fig. 1 is a schematic view of an application scenario based on which the synchronization signal transmission detection method provided in the embodiment of the present invention is based, and referring to fig. 1, the present invention is mainly applied to an M2M communication system. The M2M communication system provides a networked application and service with intelligent interaction of machine terminals as a core. M2M technology provides a means for devices to establish wireless connections, transfer data, between systems, between remote devices, and/or between individuals in real time. The wireless communication module is embedded in the machine, so that the machine can be monitored, commanded and scheduled, and data acquisition, measurement and the like.
The M2M system has many application scenarios, such as application to an intelligent meter reading system, environmental monitoring, remote monitoring, and the like. Most M2M devices are relatively small, battery-powered devices.
Two types of network elements are mainly involved in the application scenario. Base station 101 or control node or access node: for transmitting synchronization signals, broadcast signals, control signals to the terminal device 102. And is responsible for scheduling each terminal device 102 to send or receive information. The terminal device 102: the access base station 101, the control node, or the access node receives a message of the base station 101, the control node, or the access node according to a synchronization signal, a broadcast signal, a control signal, or the like of the base station 101, the control node, or the access node.
In the embodiment of the present invention, the type of the terminal device 102 is not limited, and the terminal device 102 may be a household appliance such as a refrigerator and a washing machine with a communication capability, an industrial device, or a communication device such as a computer and a mobile phone.
Fig. 2 is a flowchart of a method for sending a synchronization signal according to an embodiment of the present invention, where the method may be based on the application scenario shown in fig. 1, and an execution subject may be a base station, a control node, or an access node, with reference to fig. 2, where the method includes:
step 201, judging whether the current subframe belongs to the first type subframe or the second type subframe.
Specifically, if the current subframe belongs to a preset number of subframes before the channel occupying time, determining the current subframe as a second type of subframe; and if the current subframe is other subframes except the second type subframe in the channel occupying time, determining that the current subframe is the first type subframe.
The predetermined number may be an integer or a decimal, for example, when the predetermined number is an integer 1, determining that a first subframe in the channel occupation time is a second-class subframe; when the preset number is an integer 2, determining a first subframe and a second subframe in the channel occupying time as second type subframes; when the predetermined number is decimal 0.5, the first half of the subframes in the channel occupation time are determined as the second type of subframes.
Step 202, when the current subframe is judged to belong to the first type subframe, a primary synchronization signal is sent in the current subframe.
Specifically, when the current subframe is judged to belong to the first type subframe, a synchronization sequence is sent in the current subframe, and the synchronization sequence is used for indicating the frame number and the subframe number of the current subframe.
The synchronization sequence mentioned in the embodiments of the present invention may also be referred to as a sequence group, where the sequence group includes one or more subsequences, and each subsequence is used to indicate one item of synchronization information, for example, one subsequence indicates a current frame number, and another subsequence indicates a current subframe number. Or one or more synchronization messages or system messages are collectively indicated by a plurality of synchronization sequence combinations.
And 203, when the current subframe is judged to belong to the second type subframe, transmitting a synchronous signal for multiple times in the current subframe.
Specifically, when the current subframe is judged to belong to the second type subframe, a plurality of synchronization sequences are sent in the current subframe, wherein the synchronization sequences are used for indicating the time slot number of the time slot in which the synchronization sequences are located.
The first-class subframe and the second-class subframe may have the same synchronization sequence, where the same synchronization sequence is used to indicate a frame number and a subframe number of a current subframe in the first-class subframe, and the same synchronization sequence is used to indicate a slot number of a slot in which the synchronization sequence is located in the second-class subframe.
Fig. 3 is a flowchart of a method for detecting a synchronization signal according to an embodiment of the present invention, where the method may be based on the application scenario shown in fig. 1, and an execution subject may be a terminal device, with reference to fig. 3, the method includes:
step 301, determining a current state, where the current state includes a state of just powering on or a state of just switching from a sleep state to a wake state or a connected state.
Step 302, determine the coverage level of the attribution, wherein the coverage level comprises a near coverage level or a far coverage level.
In this embodiment of the present invention, the terminal device may determine, according to its own channel quality, that the terminal device belongs to one of N levels divided in advance, where N > is 2, and then determine, according to a correspondence relationship between the N levels and a far coverage level or a near coverage level, which is notified by the base station or defined in advance by the base station and the terminal device, a coverage level to which the terminal device belongs.
Wherein, step 301 and step 302 are optional steps, and only step 301 may be executed, and step 302 is not executed; alternatively, only step 302 is performed, and step 301 is not performed; alternatively, both step 301 and step 302 are performed. When both step 301 and step 302 are executed, the order of step 301 and step 302 is not limited, and step 301 may be executed first, and then step 302 may be executed; or, step 302 is executed first, and then step 301 is executed; alternatively, step 301 and step 302 are performed simultaneously.
And step 303, selecting to receive and detect the synchronization signal according to the first mode or the second mode according to the determined current state and/or the coverage level of the attribution.
Specifically, when the synchronization signal is selected to be received and detected in the first manner, the synchronization signal detection is included once per subframe; when the synchronization signal reception according to the second mode is selected, a plurality of synchronization signal detections are included per subframe.
When the synchronization signal is selected to be received according to the second mode, if multiple synchronization signals contained in the second type of sub-frame are different, that is, the synchronization sequence sent by the base station can indicate the time slot number, the terminal device detects the synchronization signal and can stop detecting after reading the current time slot number; if the multiple synchronous signals contained in the second type of sub-frame are the same, the detection is continued after the synchronous signal is detected, and the detection can not be stopped until the synchronous signal different from the synchronous signal detected last time is detected, namely the synchronous signal is detected to be stopped.
Optionally, when the determined current state is a state just powered on or a state just switched from a sleep state to an awake state, selecting to receive and detect the synchronization signal according to a first mode; and when the determined current state is the connection state, selecting to receive and detect the synchronous signal according to the second mode.
Optionally, when the determined coverage level of the attribution is a near coverage level, selecting to receive and detect the synchronization signal according to a first mode; and when the determined coverage grade of the attribution is a far coverage grade, selecting to receive and detect the synchronous signal according to the second mode.
Optionally, when the determined coverage level of the affiliation is a near coverage level and the determined current state is a state of being powered on or a state of being switched from a sleep state to an awake state, or when the determined coverage level of the affiliation is a far coverage level and the determined current state is a state of being powered on, selecting to receive and detect the synchronization signal according to a first mode; and when the determined coverage grade of the attribution is a near coverage grade and the determined current state is a connected state, or when the determined coverage grade of the attribution is a far coverage grade and the determined current state is a connected state or just transits from a dormant state to an awakened state, selecting to receive and detect the synchronous signal according to the second mode.
In the embodiment of the invention, when the synchronous signals are received and detected according to the first mode, the synchronous sequence is detected according to the synchronous signals contained in each subframe, and the frame number and the subframe number are obtained through the detected synchronous sequence; and when the synchronous signal is selected to be received and detected according to the second mode, detecting a synchronous sequence according to the fact that each subframe comprises a plurality of times of synchronous signals, and acquiring a time slot number through the detected synchronous sequence.
Compared with the prior art, in the embodiment of the invention, the synchronous signal is not sent according to the fixed time interval, but the synchronous signal is sent once in the first type of subframe and is sent for multiple times in the second type of subframe, so that the far-coverage terminal equipment can be quickly synchronized, and the synchronous time of the near-coverage user is taken into account.
Fig. 4 is a schematic diagram of synchronization signals in normal subframes according to an embodiment of the present invention, where each group of synchronization signals is composed of a sequence or a sequence combination. The information indicated by the synchronization signal may include: physical Cell identification (PID), frame Number in the non-contention window (Inner CFW frame Number, ICFN) within the channel time occupied by the present system, Sub-frame Number (Sub-frame Number), etc. The specific information content indicated by each sequence or sequence combination may be defined in advance by the base station and the terminal device. In the subframe with data, the base station sends a synchronization signal at the beginning of each subframe, and indicates the current subframe number by a sequence or a sequence combination, referring to fig. 4, subframe 0 and subframe 1 adopt different synchronization sequences or sequence combinations. In the normal subframe, only subframes in which both the frame number and the subframe number are the same use the same synchronization sequence or sequence combination.
Fig. 5 is a schematic diagram of a synchronization signal in a preamble subframe according to an embodiment of the present invention, where according to a rule of an unlicensed frequency band, a system needs to stop sending a signal after occupying a channel for a certain period of time, so as to yield the channel. Referring to fig. 5, in the embodiment of the present invention, after the base station camps on the channel, multiple groups of continuous synchronization signals are sent to enable the terminal to quickly acquire the synchronization signals and the system configuration information. If the terminal device has not completed communication with the base station before, and needs to monitor when the base station re-preempts the channel to continue communication, the terminal device detects the synchronization signal according to the schematic diagram. Wherein each trellis in fig. 5 represents a set or combination of synchronization sequences.
The synchronization sequence or sequence combination in the preamble subframe and the synchronization sequence or sequence combination in the normal subframe may adopt the same configuration, such as indicating PID content by the sequence or sequence combination. The difference is that the sequence or the sequence combination of the subframe number and the frame number is indicated in the normal subframe, and is used for indicating the timeslot number in the preamble subframe, specifically, the base station and the terminal device agree in advance to use the sequence corresponding to each subframe in which frame to indicate the timeslot number in the preamble subframe, so that the terminal device can directly calculate the starting position of the normal subframe in which timeslot to detect the sequence or the sequence combination. Specifically, referring to fig. 5, because the sequences or sequence combinations transmitted in each timeslot in the preamble subframe are all different, if the terminal device determines that the received sequence or sequence combination is the sequence or sequence combination corresponding to timeslot 4 when determining to capture the synchronization signal, the terminal device determines that there are 3 timeslots (timeslots 5,6,7) in the preamble subframe to be transmitted, and the normal subframe starts to be transmitted after the preamble subframe, so the terminal device can determine the starting position of the normal subframe.
Fig. 6 is a schematic diagram of a synchronization signal in a preamble subframe according to another embodiment of the present invention, in order to ensure that as many terminal devices as possible acquire synchronization information, a preamble subframe that is longer than that in fig. 5 is used in this embodiment, and the preamble subframe is composed of a preamble1 and a preamble2, as shown in fig. 6, preamble1 and preamble2 each include 8 slots, where 8 slots of the preamble1 are multiplexed with a sequence combination that is used by 8 subframes of the normal subframe in which ICFN is 0; sequence combination adopted by 8 subframes with ICFN equal to 1 in 8 time slots multiplexing normal subframes of preamble 2. Therefore, the terminal equipment can directly identify the end position of the preamble subframe and the start position of the normal subframe in which time slot to detect the synchronization sequence or the sequence combination.
In the embodiment of the invention, the terminal equipment can receive the synchronous signals according to different states and/or coverage categories. In the first mode, the synchronization signal detection is included once per frame; in the second mode there are multiple consecutive sync signal detections within a frame.
The method for detecting the synchronization signal by the terminal device may be divided according to the state of the terminal device, or may be considered according to the coverage level of the terminal device, or a combination of the two.
Dividing according to the state: the terminal equipment judges according to the current state, which mode (pattern) to detect the synchronous signal. The specific division criterion is as follows: if the terminal equipment is in a state of detecting a synchronous signal when the base station seizes the channel last time and waiting for the base station to seize the channel again, detecting a preamble signal and detecting according to the continuous synchronous signal; if the terminal device is in a state of just powering on or waking up from a power saving mode, detection is performed according to the discrete synchronization signal. If the terminal equipment is in a state that the synchronous signal is detected when the base station seizes the channel last time and waits for the base station to seize the channel again or awaken from a power saving mode, detecting a preamble signal and detecting according to the continuous synchronous signal; and if the terminal equipment is in a state of being just powered on, detecting according to the discrete synchronous signal.
Dividing according to coverage grades: the system attributes the terminal equipment to different coverage levels according to the channel quality of the terminal equipment. When the terminal equipment is powered on for the first time and the synchronous signals are initially detected, all the terminal equipment detect the synchronous signals according to the discrete pattern. And then the terminal equipment judges which coverage grade the terminal equipment belongs to according to the received base station signal or the base station judges the coverage grade of the terminal equipment and informs the terminal equipment. After the coverage level is determined, the terminal equipment belonging to the far coverage level detects the synchronous signal according to the continuous pattern; and the terminal equipment belonging to the near coverage level detects the synchronous signal according to the discrete pattern.
There may be multiple coverage classes in the system, requiring the base station to inform or the base station and the terminal device to predefine which coverage classes belong to the far coverage and which coverage classes belong to the near coverage.
Dividing according to the state and the coverage grade: when the terminal equipment is powered on for the first time and the synchronous signals are initially detected, all the terminal equipment detect the synchronous signals according to the discrete pattern. The terminal device can then determine which coverage class it belongs to based on the received base station signal. After the coverage grade is determined, if the terminal equipment which is covered nearly is in a dormant state and is converted into an awakening state, the terminal equipment detects a synchronous signal according to a discrete pattern; if the terminal device with near coverage is in a connected state and there is data to be sent in the next Channel Occupied time (COD), the terminal device detects the synchronization signal according to the continuous pattern. And after the far-coverage terminal equipment determines the coverage grade, the far-coverage terminal equipment always detects the synchronous signals according to the continuous pattern.
The terminal equipment can determine the subframe boundary and the sending time of the control signal and the broadcast signal according to the detection result.
In the embodiment of the invention, a base station adopts two different patterns to send synchronous signals, and the discrete patterns are sent in normal subframes; the continuous pattern is sent in preamble subframes. The terminal equipment selects which pattern to detect the synchronous signal according to different modes. The same synchronization sequence or sequence combination indicates different information in the two patterns: and indicating a frame number and a subframe number in the normal subframe, and indicating a slot number in the preamble subframe. The method and the device can enable the terminal equipment to quickly acquire whether the base station occupies the channel or not and quickly acquire the base station synchronization information. Meanwhile, the access time after the terminal equipment is powered on is considered.
Fig. 7 is a schematic diagram of a synchronization signal in a preamble subframe according to another embodiment of the present invention, where the setting of the synchronization signal in a normal subframe corresponding to the preamble subframe is the same as that in the previous embodiment, and referring to fig. 7, in this embodiment, different frames and subframes are indicated by sending different sequences in the normal subframe. And sending a repeated synchronous signal in a preamble subframe, wherein the repeated synchronous signal is specifically which group of sequences or sequence combination, and can be appointed by the base station and the terminal equipment in advance or notified by the base station in a previous channel occupation period. As shown in fig. 7, repeatedly transmitted in the preamble subframe is a sequence or a sequence combination indicating that the subframe number is 7.
And the terminal equipment judges which pattern to detect the synchronous signal according to different states and/or types of the terminal equipment. Different from the previous embodiment, when the terminal device detects the synchronization signal in the preamble subframe, after detecting the synchronization sequence or sequence combination indicating the subframe 7, it continues to detect whether the next group of sequences or sequence combinations indicates the subframe 7 or indicates the subframe 0, and if the sequence is the indication subframe 7, continues to detect; if subframe 0 is indicated, the terminal device may determine that the normal subframe starts, and then receive control, broadcast, and the like signals according to the frame structure of the normal subframe.
In the embodiment of the invention, a base station adopts two different synchronous signals to send a pattern, and the discrete pattern is sent in a normal subframe; the continuous pattern is sent in preamble subframes. The terminal equipment selects which pattern to detect the synchronous signal according to different states and/or categories. The method and the device can enable the terminal equipment to quickly acquire whether the base station occupies the channel or not and quickly acquire the base station synchronization information. Meanwhile, the access time after the terminal equipment is powered on is considered.
Fig. 8 is a schematic diagram of a frame structure in each COD, where the following channels are referred to, physical shared synchronization channel (PSCH), Physical Broadcast Channel (PBCH), Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), and Physical Uplink Shared Channel (PUSCH). Sending a preamble at the COD, wherein the preamble occupies half or one subframe duration and is a periodically repeated synchronous signal; and sending normal subframes after the preamble, wherein each normal subframe comprises an uplink signal and a downlink signal, and the uplink signal and the downlink signal are sent according to a preset proportion, if each frame has 16 time slots, and the ratio of the uplink time slot to the downlink time slot is 3:5, the downlink occupies 6 time slots, and the uplink occupies 10 time slots. Wherein, each subframe initial position sends a synchronous signal; then, transmitting a control signal or a broadcast signal, wherein the broadcast signal is transmitted in even subframes (such as subframes 0,2 and 4), and the control signal is transmitted in odd subframes (such as subframes 1,3 and 5); the rest downlink time slots after the synchronization, broadcast and control signals are sent are used for sending downlink data through the PDSCH; and all uplink time slots are used for transmitting uplink data, and uplink control information is also included therein, such as downlink data signal feedback.
In the embodiment of the invention, a base station adopts two different synchronous signals to send a pattern, and the discrete pattern is sent in a normal subframe; the continuous pattern is sent in preamble subframes. The terminal equipment selects which pattern to detect the synchronous signal according to different states: powering on or waking up from a sleep state according to discrete pattern detection; and in a connection state, detecting according to the continuous pattern when waiting for the next channel occupation time to continue transmission. The method and the device can enable the terminal equipment to quickly acquire whether the base station occupies the channel or not and quickly acquire the base station synchronization information. Meanwhile, the access time after the terminal equipment is powered on is considered.
In the embodiment of the invention, two patterns are adopted in two different types of subframes, so that the method has the advantages that each subframe has a group of synchronous signals in a discrete mode that each subframe sends a group of synchronous signals, the terminal equipment detects the initial position of the subframe through energy accumulation, the detection times of the terminal equipment are increased along with the reduction of channel conditions, the detection times of the near-coverage terminal equipment are less, and the quick synchronization can be realized. The advantage of this method is that the terminal device can detect the synchronous signal to determine whether the system possesses the channel and read the system message when it is powered on or woken up at any time during the communication process of the system. However, the far-coverage terminal device needs to detect for many times to complete synchronization, so that the synchronization time is long. If the base station still transmits the synchronization signal in the discrete mode after occupying the channel, the far-coverage terminal device may need more than 1 second to detect the synchronization signal, and the data transmission rate of the far-coverage terminal device is slow, and the required time is longer, while in an unlicensed (unlicensed) frequency band, the time for the system to occupy the frequency band each time is limited, so that it is necessary to quickly synchronize all the terminal devices in the system, especially the far-coverage terminal device. Therefore, by adopting the mode of continuously transmitting the synchronous signal by the preamble subframe, the terminal equipment can quickly detect the synchronous signal to determine whether the base station has preempted the channel and when to start to transmit the broadcast, the control information and the like.
Fig. 9 is a structural diagram of a device for detecting a synchronization signal according to an embodiment of the present invention, where the device is configured to execute a method for detecting a synchronization signal according to an embodiment of the present invention, and the device includes:
a determining unit 901, configured to determine a current state of the terminal device, where the state includes a state of just powering on or a state of just switching from a sleep state to an awake state or a connection state; and/or determining the coverage grade to which the terminal equipment belongs, wherein the coverage grade comprises a near coverage grade or a far coverage grade;
a receiving unit 902, configured to receive a synchronization signal;
a processing unit 903, configured to detect, according to the current state of the terminal device and/or the coverage level to which the terminal device belongs, which is determined by the determining unit 901, a synchronization signal received by the receiving unit 902 according to a first manner or a second manner;
the first mode includes detecting a synchronization signal including the synchronization signal once per subframe;
the second method includes detecting a synchronization signal including a plurality of times of synchronization signal per subframe.
Optionally, the processing unit 903 is specifically configured to:
when the current state of the terminal device determined by the determining unit 901 is a state of just powering on or just switching from a sleep state to an awake state, detecting a synchronization signal according to a first mode; or
When the current state of the terminal device determined by the determining unit 901 is a connected state, the synchronization signal is detected according to a second method.
Optionally, the processing unit 903 is specifically configured to:
when the coverage level to which the terminal device belongs, determined by the determining unit 901, is a near coverage level, detecting a synchronization signal in a first manner; or
When the coverage level to which the terminal device belongs, determined by the determining unit 901, is a far coverage level, a synchronization signal is detected according to a second method.
Optionally, the processing unit 903 is specifically configured to:
when the coverage level to which the terminal device belongs is determined to be a near coverage level by the determining unit 901, and the determined state in which the terminal device is currently located is a state of just being powered on or is just being switched from a sleep state to an awake state, or when the determined coverage level to which the terminal device belongs is a far coverage level and the determined state in which the terminal device is currently located is a state of just being powered on, detecting a synchronization signal according to a first mode;
when the coverage level to which the terminal device belongs determined by the determining unit 901 is a near coverage level and the determined state in which the terminal device is currently located is a connected state, or when the determined coverage level to which the terminal device belongs is a far coverage level and the determined state in which the terminal device is currently located is a connected state or just switched from a dormant state to an awake state, detecting a synchronization signal according to a second method.
Optionally, the processing unit 903 is further configured to:
after the synchronous signal is detected according to the first mode, acquiring a frame number and a subframe number through the detected synchronous signal;
and after the synchronous signal is detected according to the second mode, acquiring the time slot number through the detected synchronous signal.
Optionally, the processing unit 903 is further configured to:
after detecting the synchronization signal according to the second mode, if the synchronization signals sent by the base station in one subframe are different, the detection is stopped after the synchronization signals are detected;
if the synchronous signals sent by the base station in one subframe are the same, the synchronous signals are detected, and then the synchronous signals are detected continuously until the detected synchronous signals are different from the synchronous signals detected last time, and the detection is stopped.
Fig. 10 is a structural diagram of a synchronization signal transmitting apparatus according to an embodiment of the present invention, the apparatus being configured to execute the synchronization signal transmitting method according to the embodiment of the present invention, and the apparatus including:
a transmitting unit 1001, configured to transmit a primary synchronization signal in a current subframe if the current subframe does not belong to a first predetermined number of subframes within a channel occupation time; or,
and if the current subframe belongs to the first preset number of subframes in the occupied time of the channel, transmitting the synchronous signal for multiple times in the current subframe.
Optionally, the sending unit 1001 is specifically configured to:
sending a synchronous signal once in the current subframe, wherein the synchronous signal is used for indicating the frame number and the subframe number of the current subframe; or,
sending different synchronous signals for many times in the current subframe, wherein the synchronous signals are used for indicating the time slot number of the time slot in which the synchronous signals are positioned; or,
the same synchronization signal is transmitted multiple times in the current subframe.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be understood by those of ordinary skill in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by a program which may be stored in a computer-readable storage medium, wherein the storage medium is a non-transitory (non-transitory) medium, such as a random access memory, a read only memory, a flash memory, a hard disk, a solid state drive, a magnetic tape (magnetic tape), a floppy disk (floppy disk), an optical disk (optical disk) and any combination thereof.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (16)
1. A method for detecting a synchronization signal, the method comprising:
determining the current state, wherein the state comprises a state of just powering on or a state of just switching from a sleep state to a wake-up state or a connection state; and/or the presence of a gas in the gas,
determining a coverage level of a home, the coverage level comprising a near coverage level or a far coverage level;
according to the determined current state and/or the coverage grade of the attribution, selecting to receive and detect the synchronous signals according to a first mode or a second mode;
the first mode includes receiving and detecting a synchronization signal including a synchronization signal once per subframe;
the second mode includes receiving and detecting a synchronization signal including a plurality of times per subframe.
2. The method of claim 1, wherein selecting to receive and detect the synchronization signal in the first manner or the second manner based on the determined current state comprises:
when the determined current state is a state of just powering on or just switching from a sleep state to an awakening state, selecting to receive and detect a synchronous signal according to a first mode; or
And when the determined current state is the connection state, selecting to receive and detect the synchronous signal according to the second mode.
3. The method of claim 1, wherein selecting to receive and detect synchronization signals in the first manner or the second manner based on the determined coverage level of the homing comprises:
when the determined coverage grade of the attribution is a near coverage grade, selecting to receive and detect the synchronous signal according to a first mode; or
And when the determined coverage grade of the attribution is a far coverage grade, selecting to receive and detect the synchronous signal according to the second mode.
4. The method of claim 1, wherein selecting to receive and detect the synchronization signal according to the first mode or the second mode according to the determined current state and/or the coverage level of the home comprises:
when the determined home coverage level is a near coverage level and the determined current state is a state of just powering on or a state of just switching from a sleep state to an awake state, or when the determined home coverage level is a far coverage level and the determined current state is a state of just powering on, selecting to receive and detect the synchronization signal according to a first mode;
and when the determined coverage grade of the attribution is a near coverage grade and the determined current state is a connected state, or when the determined coverage grade of the attribution is a far coverage grade and the determined current state is a connected state or just transits from a dormant state to an awakened state, selecting to receive and detect the synchronous signal according to the second mode.
5. The method of any of claims 1 to 4, wherein after selecting to receive and detect synchronization signals in the first manner, the method further comprises:
acquiring a frame number and a subframe number through the detected synchronous signal;
after selecting to receive and detect the synchronization signal according to the second mode, the method further comprises: and acquiring the time slot number through the detected synchronous signal.
6. The method of any of claims 1-4, wherein the selecting to receive and detect synchronization signals in the second manner comprises:
if the synchronous signals sent by the base station in a subframe are different, stopping detection after the synchronous signals are detected;
if the synchronous signals sent by the base station in one subframe are the same, the synchronous signals are detected, and then the synchronous signals are detected continuously until the detected synchronous signals are different from the synchronous signals detected last time, and the detection is stopped.
7. A method for transmitting a synchronization signal, the method comprising:
if the current sub-frame does not belong to the first preset number of sub-frames in the occupied time of the channel, a primary synchronization signal is sent in the current sub-frame; or,
and if the current subframe belongs to the first preset number of subframes in the occupied time of the channel, transmitting the synchronous signal for multiple times in the current subframe.
8. The method of claim 7, wherein said transmitting a synchronization signal once in a current subframe comprises:
sending a synchronous signal once in the current subframe, wherein the synchronous signal is used for indicating the frame number and the subframe number of the current subframe; or,
the transmitting the multiple synchronization signals in the current subframe includes:
sending different synchronous signals for many times in the current subframe, wherein the synchronous signals are used for indicating the time slot number of the time slot in which the synchronous signals are positioned; or,
the same synchronization signal is transmitted multiple times in the current subframe.
9. An apparatus for detecting a synchronization signal, the apparatus comprising:
the terminal equipment comprises a determining unit, a judging unit and a judging unit, wherein the determining unit is used for determining the current state of the terminal equipment, and the state comprises a state of just powering on or a state of just switching from a sleep state to an awakening state or a connection state; and/or determining the coverage grade to which the terminal equipment belongs, wherein the coverage grade comprises a near coverage grade or a far coverage grade;
a receiving unit for receiving a synchronization signal;
a processing unit, configured to detect, according to the current state of the terminal device and/or the coverage level to which the terminal device belongs, the synchronization signal received by the receiving unit in a first manner or a second manner according to the state of the terminal device determined by the determining unit;
the first mode includes detecting a synchronization signal including the synchronization signal once per subframe;
the second method includes detecting a synchronization signal including a plurality of times of synchronization signal per subframe.
10. The apparatus as claimed in claim 9, wherein said processing unit is specifically configured to:
when the current state of the terminal equipment determined by the determining unit is a state of being just powered on or just switched from a sleep state to an awakening state, detecting a synchronous signal according to a first mode; or
And when the current state of the terminal equipment determined by the determining unit is a connection state, detecting a synchronous signal according to a second mode.
11. The apparatus as claimed in claim 9, wherein said processing unit is specifically configured to:
when the coverage grade which the terminal equipment belongs to and is determined by the determining unit is a near coverage grade, detecting a synchronous signal according to a first mode; or
And when the coverage grade of the terminal equipment determined by the determining unit is a far coverage grade, detecting a synchronous signal according to a second mode.
12. The apparatus as claimed in claim 9, wherein said processing unit is specifically configured to:
when the coverage grade to which the terminal equipment belongs is determined to be a near coverage grade by the determining unit and the current state of the terminal equipment is determined to be a power-on state or a power-on state, or when the coverage grade to which the terminal equipment belongs is determined to be a far coverage grade and the current state of the terminal equipment is determined to be the power-on state, detecting a synchronization signal according to a first mode;
and when the coverage grade of the terminal equipment determined by the determining unit is a near coverage grade and the state of the terminal equipment is determined to be a connected state, or when the coverage grade of the terminal equipment determined by the determining unit is a far coverage grade and the state of the terminal equipment determined to be the connected state or just switched from the dormant state to the awakened state, detecting a synchronization signal according to a second mode.
13. The apparatus of any of claims 9 to 12, wherein the processing unit is further to:
after the synchronous signal is detected according to the first mode, acquiring a frame number and a subframe number through the detected synchronous signal;
and after the synchronous signal is detected according to the second mode, acquiring the time slot number through the detected synchronous signal.
14. The apparatus of any of claims 9 to 12, wherein the processing unit is further to:
after detecting the synchronization signal according to the second mode, if the synchronization signals sent by the base station in one subframe are different, the detection is stopped after the synchronization signals are detected;
if the synchronous signals sent by the base station in one subframe are the same, the synchronous signals are detected, and then the synchronous signals are detected continuously until the detected synchronous signals are different from the synchronous signals detected last time, and the detection is stopped.
15. An apparatus for transmitting a synchronization signal, the apparatus comprising:
a sending unit, configured to send a primary synchronization signal in a current subframe if the current subframe does not belong to a first predetermined number of subframes within a channel occupation time; or,
and if the current subframe belongs to the first preset number of subframes in the occupied time of the channel, transmitting the synchronous signal for multiple times in the current subframe.
16. The apparatus as claimed in claim 15, wherein said transmitting unit is specifically configured to:
sending a synchronous signal once in the current subframe, wherein the synchronous signal is used for indicating the frame number and the subframe number of the current subframe; or,
sending different synchronous signals for many times in the current subframe, wherein the synchronous signals are used for indicating the time slot number of the time slot in which the synchronous signals are positioned; or,
the same synchronization signal is transmitted multiple times in the current subframe.
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| CN201610134259.4A CN107181561A (en) | 2016-03-10 | 2016-03-10 | Sending method, the detection method and device of synchronizing signal |
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| CN110830206B (en) * | 2018-08-10 | 2022-03-29 | 展讯通信（上海）有限公司 | PDCCH (physical Downlink control channel) determination and synchronization signal detection and transmission methods and devices, storage medium, terminal and base station |
| CN115113774A (en) * | 2022-06-28 | 2022-09-27 | 上海中汇亿达金融信息技术有限公司 | Screen locking and unlocking method and related device |
| CN115113774B (en) * | 2022-06-28 | 2023-10-24 | 上海中汇亿达金融信息技术有限公司 | Screen locking and unlocking method and related device |
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