CN109302739B

CN109302739B - Method and device for sending and receiving synchronization signal

Info

Publication number: CN109302739B
Application number: CN201710607168.2A
Authority: CN
Inventors: 贾琼; 朱俊; 张佳胤; 庞继勇; 范巍巍
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-07-24
Filing date: 2017-07-24
Publication date: 2020-11-17
Anticipated expiration: 2037-07-24
Also published as: CN112492623B; CN109302739A; CN112492623A; WO2019020011A1

Abstract

The application discloses a sending method, a receiving method and a device of a synchronous signal, when a network device monitors that a channel is idle, at least one of the synchronous signal and synchronous signal time information is sent to a terminal device at a first time domain position, and the terminal device can acquire the actual time domain position of the synchronous signal according to the synchronous signal time information, so that the terminal device can accurately receive the synchronous signal at the appointed time domain position, and uplink synchronization is realized.

Description

Method and device for sending and receiving synchronization signal

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting and receiving a synchronization signal.

Background

Spectrum resources are scarce resources for wireless communication, and in order to improve the utilization rate of spectrum resources, currently, unlicensed spectrum resources are considered to be applied to a wireless communication system, for example: unlicensed spectrum resources are used in Long Term Evolution (LTE) or New Radio (NR). The unlicensed spectrum resources need to be used in a contention mode, a station monitors whether an unlicensed spectrum is idle before sending data, and can only send data on the unlicensed spectrum when the unlicensed spectrum is idle, otherwise, the station cannot send data, and the mechanism of monitoring before sending is called a Listen Before Talk (LBT) mechanism.

Before User Equipment (UE) performs data transmission, the UE needs to receive a synchronization signal sent by a station, and access to a network according to the synchronization signal to perform synchronization with a cell in the network. The procedure of listening before speaking is also needed before the station uses the unlicensed spectrum to send the synchronization signal, however, because of uncertainty in the time when the station listens before speaking to the unlicensed spectrum as idle, the station cannot timely send the synchronization signal to the user equipment, and thus the user equipment cannot synchronize with the cell.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a method and an apparatus for sending a synchronization signal, which can implement cell synchronization of a terminal device on an unlicensed spectrum.

In a first aspect, the present application provides a method for sending a synchronization signal, including: the network equipment carries out channel interception, and sends a synchronizing signal and/or synchronizing signal time information to the terminal equipment at a first time domain position under the condition that a channel interception result is idle, wherein the first time domain position is behind a preset sending starting time of the synchronizing signal or is coincided with the preset sending starting time of the synchronizing signal, and the first time domain position is aligned with a time unit boundary.

The channel is a spectrum resource in a certain frequency range, and the spectrum resource is an unlicensed spectrum resource. The method for the network equipment to sense whether the channel is idle is as follows: and measuring the receiving power of the channel in a preset time length, if the receiving power is less than a preset threshold, indicating that the channel is in an idle state, otherwise, indicating that the channel is in a busy state. The network device stores a preset time domain position of a synchronization signal to be sent, wherein the preset time domain position comprises a preset sending start time, a preset sending end time and a duration time. The first time domain position coincides with or is subsequent to a preset transmission start time of the synchronization signal. The time unit is the minimum time granularity used by the network device and the terminal device for data transmission, for example: the time unit is any one of a symbol, a slot, a Transmission Time Interval (TTI) and a subframe, where the slot may be a mini slot (mini slot), and the transmission time interval may be a short TTI; the time cell boundary may be a starting boundary or an ending boundary of a time cell. The synchronization signal time information is used for indicating the terminal device to acquire the actual time domain position of the synchronization signal.

By implementing the embodiment of the invention, when the network equipment monitors that the channel is idle, at least one of the synchronization signal and the synchronization signal time information is sent to the terminal equipment at the first time domain position, and the terminal equipment can acquire the actual time domain position of the synchronization signal according to the synchronization signal time information, so that the terminal equipment can accurately receive the synchronization signal at the specified time domain position, thereby realizing uplink synchronization.

In a possible design, the network device monitors that the channel is idle at the second time domain position, the second time domain position is not aligned with the time unit boundary, and the network device can send the synchronization signal time information between the second time domain position and the first time domain position before the second time domain position is located at the first time domain position, so that the occupation of the time domain resources of the synchronization signal can be reduced, and the reliability of the transmission of the synchronization signal is improved.

In another possible design, the synchronization signal includes n synchronization signal blocks, a start boundary of a 1 st synchronization signal block of the n synchronization signal blocks is aligned with the first time domain position, a relative position of each synchronization signal block of the n synchronization signal blocks is kept unchanged, and n is an integer greater than 0.

The synchronization signal is sent in a Synchronization Signal Block (SSB) manner, and includes n synchronization signal blocks, where the synchronization signal blocks represent a time-frequency resource, and the n synchronization signal blocks may be distributed continuously or discontinuously. The starting boundary of the 1 st synchronous signal block in the n synchronous signal blocks is aligned with the first time domain position, and the arrangement sequence of each synchronous signal block in the n synchronous signal blocks is kept unchanged. In this embodiment, the network device translates the synchronization signal in an overall translation manner, so that the start position of the synchronization signal is aligned with the first time domain position.

In yet another possible design, the synchronization signal time information includes: at least one of a subframe index, a symbol index, a slot index and a transmission time interval index corresponding to the first time domain position; or

At least one of a subframe offset, a symbol offset, a slot offset, and a TTI offset between a first time domain position and a preset starting transmission time of the synchronization signal.

In yet another possible design, the synchronization signal includes n synchronization signal blocks, the first time domain position is aligned with a start boundary of an ith synchronization signal block of the n synchronization signal blocks, and relative positions of 1 st to i-1 st synchronization signal blocks of the n synchronization signal blocks are kept unchanged; the relative positions of the ith to nth synchronous signal blocks are kept unchanged, the starting boundary of the 1 st to i-1 st synchronous signal blocks after the nth synchronous signal block or the 1 st synchronous signal block is aligned with the ending boundary of the n synchronous signal blocks, n is an integer larger than 1, i is larger than or equal to 2 and smaller than or equal to n, and i is an integer.

The actual time domain position of the ith to nth synchronous signal blocks in the n synchronous signal blocks is the same as the preset time domain position, and the actual time domain position of the 1 st to i-1 st synchronous signal blocks is different from the preset time domain position. The arrangement sequence of the 1 st to the (i-1) th synchronous signal blocks in the n synchronous signal blocks is unchanged, the arrangement sequence of the i th to the nth synchronous signal blocks is unchanged, and the starting boundary of the 1 st synchronous signal block after the nth synchronous signal block or the starting boundary of the ith synchronous signal block is aligned with the ending boundary of the nth synchronous signal block. In this embodiment, the network device translates the synchronization signal block before the first time domain position in a local translation manner, and the time domain position of the synchronization signal block after the first time domain position remains unchanged, thereby reducing the calculation amount.

In yet another possible design, the synchronization signal time information includes:

at least one of a subframe index, a symbol index, a slot index and a TTI index where the actual time domain positions of the 1 st to i-1 th synchronization signal blocks in the n synchronization signal blocks are located; or

At least one of subframe offset, symbol offset, time slot offset and TTI offset between the actual time domain position and the preset time domain position of the 1 st to the i-1 th synchronous signal blocks in the n synchronous signal blocks.

In yet another possible design, a distance between the first time domain position and a preset transmission start time of the synchronization signal is smaller than a preset distance.

For a radio frame, the synchronization signal must be sent before the end of the designated subframe, for example: the distance between the first time domain position and the preset transmission starting time must ensure that the synchronous signal is completely transmitted before the 5 th subframe is finished, and if the distance between the first time domain position and the preset transmission starting time is greater than the preset distance, the network equipment can transmit the synchronous signal again in the next wireless frame.

In yet another possible design, the channel sensing by the network device includes:

the network equipment monitors each sub-band in the system frequency band;

when one or more sub-bands are monitored to be in an idle state, the network equipment sends indication information of the one or more sub-bands in the idle state to the terminal equipment at a first time domain position.

The system frequency band is a spectrum resource in a designated frequency range, the system frequency band is divided into a plurality of sub-bands, the bandwidth of the sub-bands is not limited in the application, the sub-bands include a plurality of sub-carriers, the sub-carriers are frequency domain resources with the minimum granularity used by the network device and the terminal device, and the number of the sub-carriers included in each sub-band is not limited in the application.

In yet another possible design, the indication information includes: at least one of a subcarrier index of the synchronization signal, an index of the one or more subbands in an idle state, a bandwidth of the one or more subbands in an idle state, a number of the one or more subbands in an idle state, a bandwidth of the system band, an index of a subband of the system band other than the one or more subbands in an idle state, a number of subbands of the system band other than the one or more subbands in an idle state, and a bandwidth of the subband of the system band other than the one or more subbands in an idle state.

In a second aspect, the present application provides a method for receiving a synchronization signal, including: the terminal equipment receives the synchronous signal time information sent by the network equipment; the terminal equipment determines the actual time domain position of the synchronous signal according to the synchronous signal time information; and the terminal equipment receives the synchronous signal sent by the network equipment at the actual time domain position.

The terminal device is located in a cell of an unlicensed spectrum, and the terminal device needs to synchronize with the cell before transmitting data. When the cell of the unlicensed spectrum is in an idle state, the terminal device can transmit data by using the unlicensed spectrum, the network device performs channel monitoring on the unlicensed spectrum, and when the monitoring result is idle, the network device sends a synchronization signal and/or synchronization signal time information to the terminal device, wherein the synchronization signal time information represents an actual time domain position of the synchronization signal or an offset between a preset sending start time and an actual sending start time of the synchronization signal, so that the terminal device can accurately receive the synchronization signal according to the synchronization signal time information to complete a cell synchronization process.

In one possible design, the receiving, by the terminal device, synchronization signal time information sent by the network device further includes:

the terminal equipment receives the indication information sent by the network equipment; wherein the indication information represents frequency domain positions of one or more sub-bands in idle state in the system frequency band.

And the terminal equipment determines the actual frequency domain position of the synchronous signal according to the indication information, and receives the synchronous signal sent by the network equipment according to the actual time domain position and the actual frequency domain position.

In another aspect, a sending apparatus of a synchronization signal, hereinafter referred to as a sending apparatus, is provided, and the sending apparatus has a function of implementing a behavior of a network device in the 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 transmitting device includes: a monitoring unit and a transmitting unit; the processor is used for carrying out channel interception; the sending unit is used for sending a synchronizing signal and/or synchronizing signal time information to the terminal equipment at a first time domain position under the condition that the interception result of the channel is idle; wherein the first time domain position is after a preset transmission start time of the synchronization signal or the first time domain position coincides with the preset transmission start time of the synchronization signal, and the first time domain position is aligned with a time unit boundary.

In another possible design, the sending apparatus includes: a transceiver, a memory, and a processor; wherein the memory stores a set of program codes therein, and the processor is configured to call the program codes stored in the memory to perform the following operations: carrying out channel interception; the transceiver is used for sending a synchronizing signal and/or synchronizing signal time information to the terminal equipment at a first time domain position under the condition that the interception result of the channel is idle; wherein the first time domain position is after a preset transmission start time of the synchronization signal or the first time domain position coincides with the preset transmission start time of the synchronization signal, and the first time domain position is aligned with a time unit boundary.

Based on the same inventive concept, as the principle and the beneficial effects of the apparatus for solving the problems can refer to the method implementation of each possible network device and the beneficial effects brought by the method implementation, the implementation of the apparatus can refer to the implementation of the method, and repeated details are not repeated.

In another aspect, a receiving apparatus for a synchronization signal, hereinafter referred to as a receiving apparatus for short, is provided, and the transmitting apparatus has a function of implementing a behavior of a terminal device in the 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 receiving apparatus includes: the receiving unit is used for receiving the synchronization signal time information sent by the network equipment; the determining unit is used for determining the actual time domain position of the synchronous signal according to the synchronous signal time information; and the receiving unit is further configured to receive the synchronization signal sent by the network device at the actual time domain position.

In another possible design, the receiving apparatus includes: a transceiver, a memory, and a processor; the transceiver is used for receiving synchronization signal time information sent by network equipment; the memory stores a set of program code therein, and the processor is configured to call the program code stored in the memory, performing the following: determining the actual time domain position of the synchronous signal according to the time information of the synchronous signal; the transceiver is further configured to receive the synchronization signal sent by the network device at the actual time domain location.

Based on the same inventive concept, as the principle and the beneficial effects of the apparatus for solving the problems can refer to the method implementation modes of the possible terminal devices and the beneficial effects brought by the method implementation modes, the method implementation can refer to the method implementation, and repeated parts are not described again.

Yet another aspect of the present application provides a computer-readable storage medium having stored therein instructions, which when executed on a computer, cause the computer to perform the method of the above-described aspects.

Yet another aspect of the present application provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the method of the above-described aspects.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present invention, the drawings required to be used in the embodiments or the background art of the present invention will be described below.

Fig. 1a is a network architecture diagram of a communication system according to an embodiment of the present invention;

fig. 1b is a schematic structural diagram of a synchronization signal according to an embodiment of the present invention;

fig. 2a is a schematic flow chart of a method for transmitting a synchronization signal according to an embodiment of the present invention;

fig. 2b is a schematic diagram of a monitoring spectrum idle according to an embodiment of the present invention;

fig. 2c is a schematic diagram illustrating a rule for monitoring a spectrum according to an embodiment of the present invention;

FIG. 2d is another schematic diagram illustrating a rule for monitoring a spectrum according to an embodiment of the present invention;

fig. 2e is another schematic diagram of a rule for monitoring a spectrum according to an embodiment of the present invention;

FIG. 2f is another diagram illustrating a rule for monitoring a spectrum according to an embodiment of the present invention;

fig. 3a is a schematic diagram of a listening rule in the time domain according to an embodiment of the present invention;

fig. 3b is another schematic diagram of a listening rule in the time domain according to an embodiment of the present invention;

fig. 3c is another schematic diagram of a listening rule in the time domain according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a synchronization signal transmitting apparatus according to an embodiment of the present invention;

fig. 5 is another schematic structural diagram of a synchronization signal transmitting apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a synchronization signal receiving apparatus according to an embodiment of the present invention;

fig. 7 is another schematic structural diagram of a synchronization signal receiving apparatus according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be described below with reference to the drawings.

Fig. 1a is a schematic diagram of an architecture of a communication system according to an embodiment of the present invention, where the communication system includes a network device and a terminal device. Fig. 1a shows that 1a network devices cooperate to communicate with 2 terminal devices. The communication system may be a global system for mobile communication (GSM), a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a Worldwide Interoperability for Microwave Access (WiMAX) system, a Long Term Evolution (LTE) system, a 5G communication system (e.g., new radio, NR) system, a communication system in which a plurality of communication technologies are merged (e.g., a communication system in which LTE technology and NR technology are merged), or a communication system in which a subsequent evolution is performed. It should be noted that the number and form of the network devices and the base station devices in fig. 1a are only exemplary illustrations, and do not limit the embodiments of the present invention.

In a long term evolution communication system, to support cell synchronization, two downlink synchronization signals are defined: primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS). For Time Division Duplexing (TDD) and Frequency Division Duplexing (FDD), the primary and secondary synchronization signals have the same structure, but differ in their time domain position in a Radio Frame (RF).

For a long term evolution communication system of frequency division duplex, a primary synchronization signal is transmitted on the last Orthogonal Frequency Division Multiplexing (OFDM) symbol of the 1 st slot (slot) of a subframe 0 and a subframe 5, and an auxiliary synchronization signal and the primary synchronization signal are transmitted on the same slot of the same subframe, but the auxiliary synchronization signal is located on the 2 nd from last orthogonal frequency division multiplexing symbol and is 1 OFDM symbol ahead of the primary synchronization signal. For a time division duplex long term evolution communication system, the primary synchronization signal is transmitted on the 3 rd orthogonal frequency division multiplexing symbol of the sub-frame 1 and the sub-frame 6, and the secondary synchronization signal is transmitted on the last 1 orthogonal frequency division multiplexing symbol of the sub-frame 0 and the

sub-frame

5, 3 orthogonal frequency division multiplexing symbols ahead of the primary synchronization signal. The terminal equipment can identify a duplex mode of the LTE communication system according to the relative position relation of the primary synchronization signal and the secondary synchronization signal, and when the long-term evolution communication system uses the authorized spectrum, the terminal equipment receives the synchronization signal at the appointed position to obtain the physical layer cell Identity (Identity, ID) and realize wireless frame synchronization, thereby synchronizing with the cell.

Referring to fig. 1b, in a new air interface in the future, a new synchronization signal structure is adopted. A synchronization signal block is used as a basic unit, the synchronization signal block is composed of a plurality of orthogonal frequency division multiplexing symbols in a time domain, a PSS, a SSS and a physical broadcast signal (PBCH) are all transmitted in the synchronization signal block, one or more synchronization signal blocks form a synchronization signal burst (SS burst), and one or more synchronization signal bursts form a synchronization signal burst set (SS burst set), so that the application scene of high-frequency multi-beams can be supported. When the new air interface uses the authorized frequency spectrum, the synchronous signal block in the wireless frame is located at the designated position, and the terminal equipment receives the synchronous signal through the designated position, so that the terminal equipment is synchronous with the cell.

From the sending process of the current synchronous signal, the sending position of the synchronous signal is fixed, however, when the communication system works in the unlicensed spectrum to transmit data, the network device needs to perform listen before talk flow before using the unlicensed spectrum to send the synchronous signal, and because there is uncertainty in the time when the listen before talk flow monitors that the unlicensed spectrum is idle, the network device cannot timely send the synchronous signal to the terminal device, so that the terminal device cannot synchronize with the cell.

The terminal device in the present application is a device with a wireless communication function, and may be a handheld device with a wireless communication function, an in-vehicle device, a wearable device, a computing device or other processing device connected to a wireless modem, and the like. The terminal devices in different networks may be called different names, for example: user equipment, access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user equipment, cellular telephone, cordless telephone, Session Initiation Protocol (SIP) telephone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), terminal equipment in a 5G network or future evolution network, and the like.

The network device in this application is a device deployed in a radio access network to provide wireless communication functions, including but not limited to: a base station (e.g., a Base Transceiver Station (BTS), a node B (NodeB, NB), an evolved node B (eNB or eNodeB), a transmission node or a transmission reception point (TRP or TP) or a next generation node B (gNB) in an NR system, a base station or a network device in a future communication network), a relay station, an access point, a vehicle-mounted device, a wearable device, a Wireless-Fidelity (Wi-Fi) station, a Wireless backhaul node, a small station, a micro station, and so on.

Referring to fig. 2a, fig. 2a is a schematic flow chart of a method for sending a synchronization signal according to an embodiment of the present invention, where the method includes, but is not limited to, the following steps:

s201, the network equipment carries out channel interception.

The channel is a spectrum resource in a designated frequency range, and the spectrum resource is an unlicensed spectrum resource. Before data is transmitted by using a channel of an unlicensed spectrum, a listen-before-talk procedure needs to be performed to monitor a state of the channel, data can be transmitted on the channel only when the channel is in an idle state, and data cannot be transmitted on the channel when the channel is in a busy state. In this embodiment, the network device may listen to one or more pre-specified channels at a time, or randomly listen to one or more channels, or listen to a channel according to a pre-specified rule, and a specific listening method is not limited.

The method for the network device to listen to the channel state of the unlicensed spectrum may be a power measurement method, specifically: the network equipment measures the received power of the channel of the unlicensed spectrum within a preset time length, and indicates that the channel is in an idle state under the condition that the measured received power is smaller than a preset power threshold value; and indicating that the channel is in a busy state under the condition that the measured received power is not less than a preset power threshold value.

In various embodiments, the channel sensing by the network device comprises: the network device monitors each sub-band in the system frequency band, and when one or more sub-bands are monitored to be in an idle state, the network device sends indication information of the one or more sub-bands in the idle state to the terminal device at a first time domain position.

The system frequency band is a spectrum resource allocated to a specified frequency range of the communication system of this embodiment, the system frequency band includes a plurality of sub-bands, each sub-band includes a plurality of subcarriers, the number of sub-bands in the system frequency band and the number of subcarriers in a sub-band may be set according to actual requirements, which is not limited in this embodiment. The network device prestores preset time domain positions of the synchronization signals, wherein the preset time domain positions comprise at least one of preset sending starting time, preset sending ending time and duration. The first time domain position is an actual initial sending time of the synchronization signal, the first time domain position coincides with or is behind a preset initial sending time of the synchronization signal, and the first time domain position is aligned with a time unit boundary of the communication system. The time unit is a time domain resource with minimum granularity used by the communication system in the data transmission process, and the boundary in the time unit boundary can be a starting boundary or an ending boundary. For example: the time unit is any one of a symbol, a slot, a subframe, and a transmission time interval.

Before the preset initial sending time of the synchronous signal, the network device respectively monitors each sub-band in the system frequency band, when one or more sub-bands are monitored to be in an idle state, indication information of the one or more sub-bands in the idle state is sent to the terminal device at the first time domain position, the terminal device receives the indication information, and the frequency domain resource used for transmitting the synchronous signal is obtained according to the indication information.

For example, referring to fig. 2b, the system frequency band includes 4 sub-bands (subbands), where the 4 sub-bands are sub-band 0, sub-band 1, sub-band 2, and sub-band 3, and each sub-band corresponds to a different frequency range. Before the preset sending start time of the synchronization signal, the network device respectively executes a listen-before-talk process for the sub-bands 0 to 3, assuming that the network device monitors that the sub-bands 0, 2 and 3 are in an idle state at the second time domain position, and the

sub-bands

0, 2 and 3 are available sub-bands, so that the network device can send the synchronization signal on at least one of the sub-bands 0, 2 and 3. The second time domain position coincides with the first time domain position when the second time domain position is aligned with the time cell boundary; in a case where the second time domain position is not aligned with the time cell boundary, the second time domain position precedes the first time domain position, and the first time domain position is a time cell boundary closest in distance to the second time domain position. And the network equipment sends the indication information of the sub-band 0, the sub-band 2 and the sub-band 3 to the terminal equipment at the first time domain position, and the terminal equipment acquires the information of the available sub-bands and the actual frequency domain position of the synchronization signal according to the indication information.

In the present application, a subband (subband) refers to one or more carriers, or a part of subcarriers or a part of resource blocks on one carrier. The concept of sub-band may no longer exist in future communication technologies, but the present application is also applicable to concepts such as partial sub-carrier or partial resource block represented by sub-band essence.

In various embodiments, the indication information includes: at least one of a subcarrier index of the synchronization signal, a subband index of the synchronization signal, an index of one or more subbands of an idle state, a bandwidth of one or more subbands of an idle state, a number of one or more subbands of an idle state, a bandwidth of the system band, a number of subbands of the system band other than the one or more subbands of the idle state, and a bandwidth of the subbands of the system band other than the one or more subbands of the idle state.

The sub-carrier index of the synchronization signal represents the index of the sub-carrier occupied by the synchronization signal, and the sub-band index of the synchronization signal represents the index of the sub-band occupied by the synchronization signal. It should be noted that the synchronization signal needs to be sent on a preset single subband, and if the network device monitors that the preset single subband is in a busy state, the network device sends the synchronization signal on an idle single subband adjacent to the preset single subband. Optionally, the subcarrier position of the synchronization signal on the preset to-be-subband and the subcarrier position on the actual idle single subband are in a mirror image relationship.

For example, according to the example of fig. 2b and 2c, each sub-band comprises 34 sub-carriers, the sub-carrier index in each sub-band is 0 to 33, and the bandwidth of each sub-carrier is 15 kHz. The upper diagram of fig. 2c shows a schematic diagram of the distribution of the preset frequency domain positions of the synchronization signal, and it can be seen from the diagram that the preset frequency domain positions of the synchronization signal are: subcarriers 4 through 6 in subband 1, and subcarriers 27 through 29 in subband 3. The network device listens in the idle state for subband 0, subband 2 and subband 3, and busy state for subband 1, so that the network device cannot transmit the synchronization signal on subband 1, and the network device may select subband 0 adjacent to subband 1 and not deployed with the synchronization signal to transmit the synchronization signal. Wherein, the sub-carrier actually occupied by the synchronization signal on sub-band 0 is in mirror image relationship with the sub-carrier preset on sub-band 1.

The following diagram of fig. 2c shows the distribution diagram of the actual frequency domain positions of the synchronization signals, and it can be seen from the diagram that the actual frequency domain positions of the synchronization signals are: sub-carriers 27 through 29 for subband 0, and sub-carriers 27 through 29 for subband 2.

According to the examples of fig. 2b and 2c, the indication information comprises at least one of the following parameters:

subcarrier index of synchronization signal: 27-29;

subband index of synchronization signal: 0 and 2;

index of one or more subbands of idle state: 0. 2 and 3;

bandwidth of one or more sub-bands of idle state: 3 x 34 x 15 kHz;

number of one or more subbands of idle state: 3, the number of the cells is 3;

bandwidth of system band: 4 x 34 x 15 kHz;

the number of other sub-bands except for one or more sub-bands in an idle state in a system band: 1, the number of the active ingredients is 1;

bandwidth of other sub-bands except for one or more sub-bands in idle state in system band: 1 × 34 × 15 kHz.

In different embodiments, the network device listens to the system frequency band, and in the case that the system frequency band is in an idle state, the network device transmits a synchronization signal over the entire system frequency band and indication information notifying the system frequency band at a first time domain position; when the system frequency band is in a busy state, the network device respectively monitors each sub-band of the system frequency band, and when one or more sub-bands are monitored to be in an idle state, the network device sends indication information of the one or more sub-bands in the idle state to the terminal device at a first time domain position. In this embodiment, the process of listening to each subband by the network device may refer to the embodiments in fig. 2b and fig. 2c, and details are not described here.

When the network device transmits the synchronization signal using multiple subbands, for the method for allocating power to multiple subbands, the network device may allocate the transmission power to the multiple subbands, or allocate the transmission power to the multiple subbands according to a preset weight, for example: and allocating larger transmission power to the sub-band with good channel quality, and allocating smaller transmission power to the sub-band with poor channel quality to increase the reliability of synchronous signal transmission.

In various embodiments, the network device listening to the channel comprises: network equipment adopts the mode of frequency hopping to listen to the channel, and the channel of two adjacent interception is different, and the channel of i intercepting is different with the channel of i +1 th interception promptly, and i is for being greater than 0's integer, and wherein, the cycle of frequency hopping can set up as required.

For example, the following steps are carried out: referring to fig. 2d, the network device listens to subband 0 for the first time, and sends a synchronization signal on subband 0 if subband 0 is in an idle state. If subband 0 is busy, the network device continues to listen to subband 1 until the subband in the idle state is listened to. As can be seen from fig. 2d, the subbands sensed twice are different, and the frequency hopping period is 4 subbands. The synchronous signals are sent on different sub-bands in a frequency hopping mode, so that the frequency diversity effect can be realized, and the sending reliability of the synchronous signals is improved.

It should be noted that the number of sub-bands listened to by the network device at a time is not limited to one in fig. 2e, and a plurality of consecutive or non-consecutive sub-bands may be listened to as needed.

In different embodiments, the network device also performs channel sensing by using a frequency hopping method, where the frequency hopping method is as follows: the channel of the network device is the same in the ith interception and the (i + 1) th interception, the channel of the (i + 2) th interception and the channel of the (i + 3) th interception are the same, but the channel of the (i + 1) th interception is different from the channel of the (i + 2) th interception to the (i + 3) th interception, and i is an integer greater than 0. Wherein, the period of the frequency hopping can be set according to the requirement.

For example, the following steps are carried out: referring to fig. 2e, the network device listens on subband 0 for the 1 st and 2 nd times and on subband 1 for the 3 rd and 4 th times. When the network equipment listens every time, if the intercepted sub-band is in an idle state, the network equipment sends the indication information of the sub-band in the idle state to the terminal equipment, and if the intercepted sub-band is in a busy state, the network equipment continues to listen for the next time until the sub-band in the idle state is intercepted.

In different embodiments, the network device performs channel interception in an alternate manner using a single sub-band and multiple sub-bands; the channel monitored for the ith time is a single subband, the channel monitored for the (i + 1) th time is a plurality of subbands, and the single subband monitored for the ith time is different from the single subband monitored for the (i + 2) th time; or the channel intercepted for the ith time is a plurality of sub-bands, the channel intercepted for the (i + 1) th time is a single sub-band, the single sub-band intercepted for the (i + 1) th time is different from the single sub-band intercepted for the (i + 3) th time, and i is an integer larger than 0.

For example, the following steps are carried out: referring to fig. 2f, which is a schematic diagram of a network device performing channel sensing in a single sub-band and multi-sub-band alternating manner, the network device performs sensing on sub-band 0 for the first time, sensing on sub-bands 0 to 3 for the 2 nd time, sensing on sub-band 1 for the 3 rd time, and so on. When the network equipment monitors each time, if the monitored sub-band or sub-bands are in an idle state, the network equipment sends the indication information of the sub-band in the idle state to the terminal equipment. The indication information also carries a flag bit indicating a single sub-band or a multi-sub-band, and the terminal device knows whether the synchronization signal is transmitted by the single sub-band or the multi-sub-band according to the flag bit.

It should be noted that the indexes of the subbands listened to by the network device each time are not limited to be the same as those in fig. 2f, and the indexes of the subbands listened to by the network device each time may also be different.

S202, the channel is idle in a listening result.

S203, the network device sends the synchronizing signal and/or the synchronizing signal time information to the terminal device at the first time domain position, and the terminal device receives the synchronizing signal and/or the synchronizing signal time information sent by the network device at the first time domain position.

The network device stores a preset time domain position of a synchronization signal to be sent, wherein the preset time domain position comprises at least one of a preset sending start time, a preset sending end time and a duration of the synchronization signal. The network equipment executes a listen-before-talk process before the preset sending start time of the synchronous signal, monitors that the channel is in an idle state at a second time domain position, and the second time domain position is superposed with the first time domain position under the condition that the second time domain position is a time unit boundary; and under the condition that the second time domain position is not the time unit boundary, the first time domain position is the time unit boundary which is behind the second time domain position and is closest to the second time domain position.

The time unit is the minimum time granularity used in the data transmission process of the communication system, the time unit can be any one of symbols, time slots and TTIs, and the time unit boundary can be a starting boundary or an ending boundary. The synchronization signal time information is used for indicating the terminal device to acquire the actual time domain position of the synchronization signal.

And S204, the terminal equipment determines the actual time domain position of the synchronous signal according to the synchronous signal time information.

The terminal equipment determines the sending position of the synchronous signal on the time domain according to the synchronous signal time information.

And S205, the terminal equipment receives the synchronous signal at the actual time domain position.

The terminal device starts to receive the synchronization signal sent by the network device at the first time domain position.

In various embodiments, the synchronization signal time information is transmitted prior to the synchronization signal. For example: under the condition that the second time domain position and the first time domain position are not coincident, and the second time domain position is before the first time domain position, the network device may send the synchronization signal to the terminal device between the second time domain position and the second time domain position, so as to reduce the occupation of the transmission resource of the synchronization signal.

It should be noted that, when the network device detects that one or more channels are in an idle state at the second time domain position, the second time domain position is not aligned with the boundary of the time unit, the network device continues to monitor the sub-bands in the idle state in the system frequency band between the second time domain position and the first time domain position, and the network device uses all the sub-bands in the idle state monitored before the first time domain position as the sub-bands available to the communication system.

In various embodiments, the synchronization signal includes n synchronization signal blocks, a start boundary of a 1 st synchronization signal block of the n synchronization signal blocks is aligned with a first time domain position, a relative position of each of the n synchronization signal blocks remains unchanged, and n is an integer greater than 0.

The network device sends the synchronization signal by using n synchronization signal blocks, wherein the synchronization signal blocks represent a block of time-frequency resources, and the n synchronization signal blocks can be distributed continuously or discontinuously. The network device monitors that the channel is in an idle state after the preset initial sending time of the synchronization signal, the network device cannot send the synchronization signal at the preset time domain position, the network device starts to send the synchronization signal from the first time domain position, and in the process of sending the synchronization signal, the relative positions of n synchronization signal blocks in the synchronization signal are kept unchanged, namely the arrangement sequence is still kept from 1 to n.

For example, referring to fig. 3a, which is a schematic diagram of a method for transmitting a synchronization signal according to this embodiment, in an embodiment of the present invention, a time unit used by a communication system is a micro slot, one radio frame includes 10 subframes (subframes), and the number of each of the 10 subframes is 0 to 9. Each subframe comprises 7 minislots in time domain, and the numbers are 1 to 7 respectively, namely each subframe comprises a minislot 1 to a minislot 7 in time domain. Assuming that the preset time domain positions of the synchronization signal are in minislot 3 and minislot 4 of subframe 0, the synchronization signal includes 2 synchronization signal blocks, the numbers of which are 1 and 2, respectively, and the time t1 is the preset initial sending time of the synchronization signal.

The network device starts to execute a listen-before-talk procedure before time t1, and assumes that the network device monitors that a channel is in an idle state at time t2, time t2 is located between a start boundary and an end boundary of a micro slot 2 of a subframe 1, time t2 is not aligned with a boundary of a micro slot, the network device takes the start boundary of a micro slot 3 of the subframe 1, which is closest to time t2, after time t2 as a first time domain position, the first time domain position is time t3 of fig. 3a, the network device transmits a synchronization signal and/or synchronization signal time information to the terminal device at time t3, the actual time domain position of the synchronization signal is in the micro slot 3 and the micro slot 4 of the subframe 1, and the transmission sequence of the synchronization signal blocks in the synchronization signal is kept unchanged.

Another example is: the preset time positions of the synchronization signals are microslot 2 and microslot 3 of subframe 5, and time t4 is the preset initial transmission time of the synchronization signals, i.e. the initial boundary of microslot 3, the network device listens to the channel before time t4, assuming that the network device monitors that the channel is in an idle state at time t5, and time t5 is aligned with the initial boundary of microslot 6 of subframe 5, time t5 is the first time domain position, the network device starts to transmit the synchronization signals at time t5, and the transmission order of two synchronization signal blocks in the synchronization signals remains unchanged, i.e. the network device starts to transmit synchronization signal block 1 first at time t5 and then transmits synchronization signal block 2.

It should be noted that, an offset between the first time domain position and the preset initial sending time needs to be smaller than a preset value, if the offset is not smaller than the preset value, the network device does not send the synchronization signal, and the network device continues to listen to the channel according to a preset listening rule.

In different embodiments, the synchronization signal time information includes at least one of a subframe index, a symbol index, a slot index and a TTI index corresponding to the first time domain position; or

At least one of a subframe offset, a symbol offset, a slot offset, and a TTI offset between the first time domain position and a preset starting transmission time of the synchronization signal.

The synchronization signal time information may be an actual time domain position of the synchronization signal, for example: as shown in fig. 3a, the actual time domain positions of the synchronization signal are minislot 3 and minislot 4 of subframe 1, and minislot 6 and minislot 7 of subframe 5.

The network device may also be an offset between a preset time domain position and an actual time domain position of the synchronization signal, for example: as shown in fig. 3a, the preset time domain positions of the previous synchronization signals are: the

minislots

3 and 4 of the subframe 0, and the actual time domain positions are the

minislots

3 and 4 of the subframe 1, then the offset between the preset time domain position and the actual time domain position can be expressed as: subframe offset 1 and minislot offset 7. The preset time domain positions of the following synchronization signals are: minislots 3 and 4 of the subframe 5, and the actual time domain positions are: the

minislots

6 and 7 of the subframe 5, the offset between the preset time domain position and the actual time domain position can be expressed as: subframe offset 0, minislot offset 3.

In different embodiments, the synchronization signal includes n synchronization signal blocks, the first time domain position is aligned with the start boundary of the ith synchronization signal block in the n synchronization signal blocks, the relative position from the 1 st synchronization signal block to the i-1 st synchronization signal block in the n synchronization signal blocks remains unchanged, the relative position from the i-th synchronization signal block to the nth synchronization signal block remains unchanged, the 1 st to the i-1 st synchronization signal blocks are aligned with the end boundary of the nth synchronization signal block after or 1 lower than the nth synchronization signal block, n is an integer greater than 1, i is an integer greater than 1, and the n synchronization signal blocks may be continuously distributed or discontinuously distributed.

For example, referring to fig. 3b, n is 2, the synchronization signal includes 2 synchronization signal blocks, i.e., a synchronization signal block 1 and a synchronization signal block 2, and the synchronization signal block 1 and the synchronization signal block 2 are distributed consecutively. The preset time domain position of the synchronization signal is at minislot 3 and minislot 4 of subframe 5, the network device monitors the channel before the start boundary of minislot 3 of subframe 5, assuming that the network device monitors that the channel is idle at time t1, time t1 is aligned with the start boundary of minislot 4 of subframe 5, time t1 is the first time domain position, the network device starts to transmit the synchronization signal at time t1, wherein the time domain position of synchronization signal block 2 remains unchanged, synchronization signal block 1 is behind synchronization signal block 2, and the start boundary of synchronization signal block 1 is aligned with the end boundary of synchronization signal block 2. In addition, the network device starts to transmit the synchronization signal time information to the terminal device at time t 1.

Referring to fig. 3c, fig. 3c differs from fig. 3b only in that the start boundary of the sync signal block 1 is not aligned with the end boundary of the sync signal block 2 after the sync signal block 1 is located behind the sync signal block 2. In other embodiments, the n synchronization signal blocks included in the synchronization signal may be within the same subframe.

In different embodiments, the synchronization signal time information includes at least one of a subframe index, a symbol index, a slot index and a TTI index where an actual time domain position of the 1 st to i-1 th synchronization signal blocks among the n synchronization signal blocks is located; or

At least one of subframe offset, symbol offset, slot offset and TTI offset between the actual time domain position and the preset time domain position of the 1 st to the (i-1) th synchronous signal blocks.

Because the first time domain position is aligned with the starting boundary of the ith synchronous signal block in the n synchronous signal blocks, when the network equipment sends the synchronous signals at the first time domain position, the time domain sending positions of the ith to nth synchronous signal blocks are consistent with the preset time domain position, only the time domain sending positions of the 1 st to the (i-1) th synchronous signal blocks are changed, and the network equipment only needs to inform the terminal equipment of the actual time domain positions of the 1 st to the (i-1) th synchronous signal blocks or inform the terminal equipment of the offset between the time domain positions of the 1 st to the (i-1) th synchronous signal blocks and the preset time domain position.

For example, referring to fig. 3b, the synchronization signal comprises 2 synchronization signal blocks: synchronization signal block 1 and synchronization signal block 2, the time domain position of synchronization signal block 2 remains unchanged, still located in minislot 4 of sub-frame 5. The preset time domain position of the synchronization signal block 1 is the micro-slot 3 of the sub-frame 5, the actual time domain position of the synchronization signal block 1 is the micro-slot 5 of the sub-frame 5, and the offset between the preset time domain position and the actual time domain position of the synchronization signal block 1 can be expressed as: subframe offset 0, minislot offset 2.

Another example is: referring to fig. 3c, the sync signal includes 2 sync signal blocks: synchronization signal block 1 and synchronization signal block 2, the time domain position of synchronization signal block 2 remains unchanged, still located in minislot 4 of sub-frame 5. The preset time domain position of the synchronization signal block 1 is the minislot 3 of the subframe 5, the actual time domain position of the synchronization signal block 1 is the minislot 6 of the subframe 5, and the offset between the preset time domain position and the actual time domain position of the synchronization signal block 1 can be expressed as: subframe offset 0, minislot offset 3.

In different embodiments, the network device may reserve a frequency domain resource with a preset duration for the synchronization signal after a preset initial sending time of the synchronization signal, where the reserved frequency domain resource is specially used for transmitting the synchronization signal, so as to avoid resource collision caused by time domain offset due to listening before speaking, and improve reliability of synchronization signal transmission.

In different embodiments, when the duration of the network device monitoring that the channel is in a busy state exceeds a preset duration, the network device may directly send a synchronization signal to the terminal device, where an actual sending start time of the synchronization signal is a time unit boundary. In addition, the terminal device may send at least one of an actual time domain position, an actual frequency domain position, a time domain offset, and a frequency domain offset of the synchronization signal to the terminal device while sending the synchronization signal. The time domain offset represents an offset between an actual time domain position and a preset time domain position of the synchronization signal, and the frequency domain offset represents an offset between an actual frequency domain position and a preset frequency domain position of the synchronization signal.

It should be noted that the sending apparatus 4 shown in fig. 4 can implement the network device side in the embodiment shown in fig. 2a, where the listening unit 401 is used to perform channel listening; for example: the listening unit performs the step of S201 in fig. 2 a. A sending unit 402, configured to, when the listening result of the channel is idle, send, by the network device, a synchronization signal and/or synchronization signal time information to a terminal device at a first time domain location; wherein the first time domain position is after a preset transmission start time of the synchronization signal or the first time domain position coincides with the preset transmission start time of the synchronization signal, and the first time domain position is aligned with a time unit boundary; for example: the transmitting unit 402 is configured to execute the steps of S202 and S203. The sending device 4 may be a network device, and the sending device 4 may also be a field-programmable gate array (FPGA), an application-specific integrated chip (asic), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit, a Micro Controller Unit (MCU), or a Programmable Logic Device (PLD) or other integrated chips, which implement related functions.

The embodiment of the present invention and the embodiment of the method in fig. 2a are based on the same concept, and the technical effects brought by the embodiment of the present invention are also the same, and the specific process can refer to the description of the embodiment of the method in fig. 2a, and will not be described again here.

As shown in fig. 5, the embodiment of the present invention further provides a transmitting apparatus 5.

In one possible design, the sending device 5 is a network device that includes:

a memory 502 for storing programs and data. The number of the memories may be one or more, and the type of the memories may be any form of storage medium. For example: the memory may be a Random Access Memory (RAM) or a Read Only Memory (ROM), or a flash memory, where the memory 502 may be located in the terminal device alone or in the processor 501.

A processor 501 configured to execute the program code stored in the memory 502, and when the program code is executed, the processor 501 is configured to determine a position of a synchronization signal burst set in the cell to be tested according to a cycle of the synchronization signal burst set in the serving cell, a cycle of the synchronization signal burst set in the cell to be tested, and the time offset; and measuring the cell to be measured according to the position of the synchronous signal burst set in the cell to be measured. For example: the processor 501 is configured to execute the step S201 in fig. 2 a.

A transceiver 503 for transmitting and receiving signals. The transceiver may be implemented as a separate chip, or may be implemented as a transceiver circuit within the processor 501 or as an input/output interface. The transceiver may be at least one of a transmitter for performing the transmitting step in the device and a receiver for performing the receiving step in the device. Optionally, the transceiver 503 may further include a transmitting antenna and a receiving antenna, where the transmitting antenna and the receiving antenna may be two antennas separately disposed, or may be one antenna. A transceiver 503, configured to send a synchronization signal and/or synchronization signal time information to a terminal device at a first time domain location when a listening result of the channel is idle; wherein the first time domain position is after a preset transmission start time of the synchronization signal or the first time domain position coincides with the preset transmission start time of the synchronization signal, and the first time domain position is aligned with a time unit boundary. For example: the transceiver 503 is used to execute the steps of S202 and S203 in fig. 2 a.

The transceiver 503, the memory 502 and the processor 501 are communicated with each other through internal connection paths, such as: connected by a bus.

In various embodiments, the synchronization signal includes n synchronization signal blocks, a starting boundary of a 1 st synchronization signal block of the n synchronization signal blocks is aligned with the first time domain position, a relative position of each synchronization signal block of the n synchronization signal blocks remains unchanged, and n is an integer greater than 0.

In various embodiments, the synchronization signal time information includes:

at least one of a subframe index, a symbol index, a slot index and a transmission time interval index corresponding to the first time domain position; or

At least one of a subframe offset, a symbol offset, a slot offset, and a TTI offset between the first time domain position and a preset initial transmission time of the synchronization signal.

In various embodiments, the synchronization signal includes n synchronization signal blocks, the first time domain position is aligned with a start boundary of an ith synchronization signal block of the n synchronization signal blocks, relative positions of a 1 st synchronization signal block to an i-1 st synchronization signal block of the n synchronization signal blocks remain unchanged, relative positions of an ith synchronization signal block to an nth synchronization signal block of the n synchronization signal blocks remain unchanged, a start boundary of a 1 st synchronization signal block to an i-1 st synchronization signal block of the n synchronization signal blocks after the nth synchronization signal block or a 1 st synchronization signal block of the n synchronization signal blocks is aligned with an end boundary of the nth synchronization signal block, n is greater than or equal to 2 and is an integer, i is greater than or equal to n and i is an integer.

Optionally, the synchronization signal time information includes:

at least one of a subframe index, a symbol index, a slot index and a transmission time interval index where the actual time domain positions of the 1 st to i-1 th synchronization signal blocks among the n synchronization signal blocks are located; or

At least one of subframe offset, symbol offset, slot offset and transmission time interval offset between the actual time domain position and the preset time domain position of the 1 st to i-1 th synchronous signal blocks in the n synchronous signal blocks.

In various embodiments, a distance between the first time domain location and a preset transmission start time of the synchronization signal is less than a preset distance.

In different embodiments, the processor 501 is configured to perform channel sensing, specifically:

monitoring each sub-band in a system frequency band;

when one or more sub-bands are sensed to be in an idle state, the transceiver 503 is instructed to transmit indication information of the one or more sub-bands in the idle state to the terminal device at a first time domain position.

In various embodiments, the indication information includes: at least one of a subcarrier index of the synchronization signal, an index of the one or more subbands in an idle state, a bandwidth of the one or more subbands in an idle state, a number of the one or more subbands in an idle state, a bandwidth of the system band, an index of a subband of the system band other than the one or more subbands in an idle state, a number of subbands of the system band other than the one or more subbands in an idle state, and a bandwidth of the subband of the system band other than the one or more subbands in an idle state.

In one possible embodiment, the transmitting device 5 may be a chip, for example: may be a communication chip used in a network device for implementing the relevant functions of the processor 501 in the network device. The chip can be a field programmable gate array, a special integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit and a microcontroller which realize related functions, and can also adopt a programmable controller or other integrated chips. The chip may optionally include one or more memories for storing program code that, when executed, causes the processor to implement corresponding functions.

These chips may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (also sometimes referred to as code or program). The procedures or functions described in accordance with the embodiments of the present application are all or partially generated upon loading and execution of computer program instructions on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

It should be noted that, the receiving apparatus 6 shown in fig. 6 can implement the terminal device side of the embodiment shown in fig. 2a, where the receiving unit 601 is configured to receive synchronization signal time information sent by a network device; a determining unit 602, configured to determine an actual time domain position of the synchronization signal according to the synchronization signal time information; a receiving unit 601, configured to receive the synchronization signal sent by the network device at the actual time domain position. For example: the receiving unit 601 performs the ratio of S203 and S205 in fig. 2 a; the determination unit 602 performs the step of S204 in fig. 2 a. The receiving device 6 may be a terminal device, and the receiving device 6 may also be a field-programmable gate array (FPGA), an application-specific integrated chip (asic), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit, a Micro Controller Unit (MCU), or a Programmable Logic Device (PLD) or other integrated chips, which implement related functions.

As shown in fig. 7, the embodiment of the present invention further provides a receiving apparatus 7.

In one possible design, the receiving device 7 is a terminal device, which includes:

a memory 702 for storing programs and data. The number of the memories may be one or more, and the type of the memories may be any form of storage medium. For example: the memory may be a Random Access Memory (RAM) or a Read Only Memory (ROM), or a flash memory, where the memory 702 may be located in the terminal device alone or in the processor 701.

A processor 701 for executing the program code stored in the memory 702, the processor 701 being configured to determine an actual time domain position of the synchronization signal based on the synchronization signal time information when the program code is executed. For example: the processor 701 is configured to execute the step of S204 in fig. 2 a.

A transceiver 703 for transmitting and receiving signals. The transceiver may be implemented as a separate chip, or may be implemented as a transceiver circuit in the processor 701 or as an input/output interface. The transceiver may be at least one of a transmitter for performing the transmitting step in the device and a receiver for performing the receiving step in the device.

Optionally, the transceiver 703 may further include a transmitting antenna and a receiving antenna, where the transmitting antenna and the receiving antenna may be two antennas separately arranged, or may be one antenna. A transceiver 703, configured to receive synchronization signal time information sent by a network device, and receive the synchronization signal sent by the network device at the actual time domain position determined by the processor 701. For example: the transceiver 703 is configured to perform the step of S204 in fig. 2 a.

The transceiver 703, the memory 702 and the processor 701 are in communication with each other through internal connection paths, such as: connected by a bus.

In different embodiments, the transceiver 703 is further configured to receive indication information sent by the network device; wherein the indication information represents frequency domain positions of one or more sub-bands in idle state in the system frequency band.

In one possible design, the receiving device 7 may be a chip, for example: may be a communication chip used in a network device for implementing the relevant functions of the processor 701 in the network device. The chip can be a field programmable gate array, a special integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit and a microcontroller which realize related functions, and can also adopt a programmable controller or other integrated chips. The chip may optionally include one or more memories for storing program code that, when executed, causes the processor to implement corresponding functions.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. 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 application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in or transmitted over a computer-readable storage medium. The computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

One of ordinary skill in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the above method embodiments. And the aforementioned storage medium includes: various media capable of storing program codes, such as ROM or RAM, magnetic or optical disks, etc.

Claims

1. A method for transmitting a synchronization signal, comprising:

the network equipment carries out channel interception;

under the condition that the interception result of the channel is idle, the network equipment sends a synchronous signal and/or synchronous signal time information to the terminal equipment at a first time domain position; wherein the first time domain position is after a preset transmission start time of the synchronization signal or the first time domain position coincides with the preset transmission start time of the synchronization signal, and the first time domain position is aligned with a time unit boundary;

the synchronous signal comprises n synchronous signal blocks, the starting boundary of the 1 st to i-1 st synchronous signal blocks in the n synchronous signal blocks is aligned with the ending boundary of the nth synchronous signal block after the nth synchronous signal block or the 1 st synchronous signal block in the n synchronous signal blocks, n is an integer larger than 1, i is larger than or equal to 2 and smaller than or equal to n, and i is an integer.

2. The method of claim 1, wherein a starting boundary of a 1 st sync signal block of the n sync signal blocks is aligned with the first time domain position, and a relative position of each of the n sync signal blocks remains unchanged.

3. The method of claim 2, wherein the synchronization signal time information comprises:

4. The method as claimed in claim 1, wherein the first time domain position is aligned with a start boundary of an ith sync signal block among the n sync signal blocks, a relative position of a 1 st sync signal block to an i-1 st sync signal block among the n sync signal blocks is maintained constant, a relative position of an ith sync signal block to an nth sync signal block among the n sync signal blocks is maintained constant, and n ≧ 2 and an integer.

5. The method of claim 4, wherein the synchronization signal time information comprises:

6. The method of any of claims 1-5, wherein a distance between the first time domain location and a preset transmission start time of the synchronization signal is less than a preset distance.

7. The method of any one of claims 1-5, wherein the network device performing channel sensing comprises:

the network equipment monitors each sub-band in a system frequency band;

8. The method of claim 7, wherein the indication information comprises: at least one of a subcarrier index of the synchronization signal, an index of the one or more subbands in an idle state, a bandwidth of the one or more subbands in an idle state, a number of the one or more subbands in an idle state, a bandwidth of the system band, an index of a subband of the system band other than the one or more subbands in an idle state, a number of subbands of the system band other than the one or more subbands in an idle state, and a bandwidth of the subband of the system band other than the one or more subbands in an idle state.

9. A method for receiving a synchronization signal, comprising:

the terminal equipment receives the synchronous signal time information sent by the network equipment;

the terminal equipment determines the time domain position of the sending of the synchronous signal according to the time information of the synchronous signal;

the terminal equipment receives the synchronous signal sent by the network equipment at the time domain position;

10. The method of claim 9, wherein the terminal device receives synchronization signal time information transmitted by a network device, further comprising:

11. A synchronization signal transmission device, comprising: a processor and a transceiver;

the processor is used for carrying out channel interception;

the transceiver is used for sending a synchronizing signal and/or synchronizing signal time information to the terminal equipment at a first time domain position under the condition that the interception result of the channel is idle; wherein the first time domain position is after a preset transmission start time of the synchronization signal or the first time domain position coincides with the preset transmission start time of the synchronization signal, and the first time domain position is aligned with a time unit boundary;

12. The apparatus of claim 11, wherein a starting boundary of a 1 st sync signal block of the n sync signal blocks is aligned with the first time domain position, and a relative position of each of the n sync signal blocks remains unchanged.

13. The apparatus of claim 11, wherein the synchronization signal time information comprises:

14. The apparatus as claimed in claim 11, wherein the first time domain position is aligned with a start boundary of an ith sync signal block among the n sync signal blocks, a relative position of a 1 st sync signal block to an i-1 st sync signal block among the n sync signal blocks is maintained, a relative position of an ith sync signal block to an nth sync signal block among the n sync signal blocks is maintained, and n ≧ 2 and an integer.

15. The apparatus of claim 14, wherein the synchronization signal time information comprises:

16. The apparatus of any of claims 11-15, wherein a distance between the first time domain location and a preset transmission start time of the synchronization signal is less than a preset distance.

17. The apparatus according to any of claims 11-15, wherein the processor is configured to perform channel sensing, in particular:

monitoring each sub-band in a system frequency band;

and when one or more sub-bands are monitored to be in an idle state, indicating the transceiver to send indication information of the one or more sub-bands in the idle state to the terminal equipment at a first time domain position.

18. The apparatus of claim 17, wherein the indication information comprises: at least one of a subcarrier index of the synchronization signal, an index of the one or more subbands in an idle state, a bandwidth of the one or more subbands in an idle state, a number of the one or more subbands in an idle state, a bandwidth of the system band, an index of a subband of the system band other than the one or more subbands in an idle state, a number of subbands of the system band other than the one or more subbands in an idle state, and a bandwidth of the subband of the system band other than the one or more subbands in an idle state.

19. The receiving device of a kind of synchronizing signal, characterized by, including transceiver and processor;

the transceiver is used for receiving the synchronous signal time information sent by the network equipment;

the processor is used for determining the actual time domain position of the synchronous signal according to the synchronous signal time information;

the transceiver is further configured to receive the synchronization signal sent by the network device at the actual time domain location;

20. The apparatus of claim 19,

the transceiver is further configured to receive indication information sent by the network device; wherein the indication information represents frequency domain positions of one or more sub-bands in idle state in the system frequency band.