WO2019169538A1

WO2019169538A1 - Synchronization method and device based on unlicensed spectrum

Info

Publication number: WO2019169538A1
Application number: PCT/CN2018/078062
Authority: WO
Inventors: 张武荣; 李振宇; 南杨; 韩金侠
Original assignee: 华为技术有限公司
Priority date: 2018-03-05
Filing date: 2018-03-05
Publication date: 2019-09-12
Also published as: CN111801980A

Abstract

Embodiments of the present application relate to the field of communications. Disclosed are a synchronization method and device based on an unlicensed spectrum, capable of effectively reducing the delay of a terminal device accessing a network and improving the system coverage capability. The specific solution is that: on the basis of an unlicensed spectrum resource, sending a synchronization signal and broadcast information in a frequency domain using a fixed channel, wherein the fixed channel occupies N channels, the N channels are adjacent, the bandwidth of each of the N channels is a first bandwidth, N is a positive integer greater than or equal to 2, and in a time unit in a time domain, and the duration occupied by the synchronization signal and broadcast information is T1, T1 being less than a preset duration. The embodiments of the present application are used in a synchronization process. The method provided by the embodiments of the present application can be applied to a communication system, such as V2X, LTE-V, V2V, Internet of vehicles, MTC, IoT, LTE-M, M2M, and Internet of things.

Description

Synchronization method and device based on unlicensed spectrum

Technical field

The present application relates to the field of communications, and in particular, to a synchronization method and device based on an unlicensed spectrum.

Background technique

The spectrum is the basis of wireless communication. In order to ensure the fair use of the spectrum, different countries have different rules. The use of wireless communication equipment in different regions must comply with the spectrum regulations of the corresponding regions. In some regions, wireless communication devices are also subject to specific regulations when used on unlicensed spectrum. For example, the Federal Communications Commission (FCC) uses equipment in the 902 MHz (Mega Hertz, MHZ)-928 MHz band. Constrained. Among them, in the FCC spectrum regulations, for digital modulation devices, the channel bandwidth needs to be greater than 500 kHz, and the power spectral density (PSD) is 8 dBm (dBm)/3 kHz. The maximum transmit power (coducted) does not exceed 30dBm.

In the existing communication system, the base station usually uses an anchor channel to carry a discovery reference signal (DRS) to transmit to the terminal device in a time division multiplexing manner. Among them, the frequency of the fixed channel does not change. The discovery reference signal includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). In addition, a system information block (SIB), a physical downlink control channel (PDCCH), and a physical downlink shared channel (physical downlink shared channel) are transmitted to the terminal device in a time division multiplexing manner on the data channel. PDSCH). Before the device is sent, it is necessary to perform a listen before talk (LBT) test, that is, to detect whether there are other devices on the frequency to be used, and if so, the device skips the transmission cycle and then transmits the next transmission opportunity. Perform LBT detection; if not, the device sends data.

In the frequency domain, the fixed channel occupies a 1.4 MHz bandwidth; in the time domain, the reference signal is found to occupy 20 milliseconds (millisecond, ms) and the transmission period is 80 ms. If the terminal device fails to receive the discovery reference signal in one cycle, it needs to continuously search for the discovery reference signal in multiple cycles. Thus, since all DRSs are serially transmitted, and the transmission period of the DRS is long, the terminal device cannot be quickly synchronized. When the cell is connected to the cell, the delay of the terminal device accessing the network is long. In addition, the use of LBT technology is also not conducive to multi-subframe merging across the maximum channel occupancy time (MCOT), reducing the system's coverage.

Summary of the invention

The embodiment of the present application provides a synchronization method and device based on an unlicensed spectrum, which can effectively reduce the delay of the terminal device accessing the network and improve the system coverage capability.

To achieve the above objective, the embodiment of the present application adopts the following technical solutions:

A first aspect of the embodiments of the present application provides a synchronization method based on an unlicensed spectrum, including: transmitting, by using a fixed channel, a synchronization signal and broadcast information in a frequency domain based on an unlicensed spectrum resource; wherein the fixed channel occupies N channels N channels are adjacent, and the bandwidth of each of the N channels is the first bandwidth, and N is a positive integer greater than or equal to 2; in the time unit in the time domain, the duration of the synchronization signal and the broadcast information is T1 , T1 is less than the preset duration. The transmitting entity that transmits the synchronization signal and the broadcast information may be a base station or a chip of the base station. The receiving entity that receives the synchronization signal and the broadcast information may be a terminal device or a chip of the terminal device. The unlicensed spectrum-based synchronization method provided by the embodiment of the present application increases the number of channels occupied by the fixed channel and reduces the duration of the synchronization signal and the broadcast information, so that the receiving entity quickly searches for the synchronization signal and the broadcast information, so that the receiving The entity synchronizes to the cell access network, thereby effectively reducing the delay of the receiving entity accessing the network; and increasing the number of channels occupied by the fixed channel, so that the sending entity repeatedly transmits the synchronization signal and the number of broadcast information increases, thereby improving System coverage.

With reference to the first aspect, in a possible implementation manner, the fixed channel further includes a first guard interval, each of the two ends of each channel includes a first guard interval, and a bandwidth of each of the N channels is a second. The bandwidth, the first bandwidth is less than or equal to the second bandwidth; or the fixed channel further includes a second guard interval, and each of the two ends of the fixed channel includes a second guard interval. For example, the first guard interval is half a subcarrier (7.5 kHz) and the second guard interval is 1.5 subcarriers (1.5*15=22.5 kHz).

In combination with the foregoing possible implementation manners, in another possible implementation manner, the synchronization signal includes a PSS and an SSS, and the broadcast information includes a PBCH, where the SSS carries a physical cell identifier (PCI), or, PSS and The SSS carries a PCI; the PBCH carries a total number of data channels and/or a frequency hopping channel list, and the frequency hopping channel list includes a channel index of a data channel that can be used to transmit service data by using a frequency hopping technique.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the broadcast information further includes an SIB, where the SIB carries a total number of data channels and/or a hopping channel list, or the PBCH and the SIB carry the total number of data channels and / or a list of frequency hopping channels. Thereby, the resources occupied by the SIB on the data channel are reduced, the resources occupied by the PDSCH and the PDCCH on the data channel are increased, and the capacity and coverage capability of the system are improved.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the method further includes: transmitting, by using a frequency hopping technique, downlink data on at least two data channels; the data channel occupies M channels, and M channels are adjacent, M The bandwidth of each channel in the channel is the first bandwidth, and M is a positive integer greater than or equal to 1. In the time unit in the time domain, the duration occupied by the data channel is T2, and the sum of T1 and T2 is the duration of the time unit. , data channel and fixed channel time division. Therefore, by increasing the number of channels occupied by the data channel, downlink data can be simultaneously transmitted to multiple receiving entities, and at the same time, multiple receiving entities can transmit uplink data on the same data channel, thereby effectively improving system coverage.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the data channel further includes a first guard interval, and each of the two ends of each channel includes a first guard interval; or the data channel further includes a second protection Interval, each of the two ends of the data channel includes a second guard interval.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the carriers occupied by the channels occupied by different data channels in the at least two data channels are completely different, or between different data channels in the at least two data channels. The occupied channel carries the same carrier portion.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the time unit includes a switching point, and the switching point is an uplink and downlink switching point.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the method further includes: sending the first indication information, where the first indication information is used to indicate a logical channel, where the logical channel is used in the M channels occupied by the data channel Uplink and downlink transmission channels.

In conjunction with the foregoing possible implementation manners, in another possible implementation manner, the method further includes: sending the second indication information, where the second indication information is used to indicate the updated logical channel.

In combination with the above possible implementation manners, in another possible implementation manner, the first bandwidth is greater than or equal to 180 kHz, and the bandwidth of the fixed channel is greater than or equal to 500 kHz.

A second aspect of the embodiments of the present application provides a synchronization method based on an unlicensed spectrum, where the method is applied to a chip of a terminal device or a terminal device, and the method includes: receiving synchronization on a fixed channel in a frequency domain based on an unlicensed spectrum resource. Signal and broadcast information; fixed channel occupies N channels, N channels are adjacent, bandwidth of each channel of N channels is first bandwidth, N is a positive integer greater than or equal to 2; in time unit in time domain The duration of the synchronization signal and the broadcast information is T1, and T1 is less than the preset duration. The transmitting entity that transmits the synchronization signal and the broadcast information may be a base station or a chip of the base station. The receiving entity that receives the synchronization signal and the broadcast information may be a terminal device or a chip of the terminal device. The unlicensed spectrum-based synchronization method provided by the embodiment of the present application increases the number of channels occupied by the fixed channel and reduces the duration of the synchronization signal and the broadcast information, so that the receiving entity quickly searches for the synchronization signal and the broadcast information, so that the receiving The entity synchronizes to the cell access network, thereby effectively reducing the delay of the receiving entity accessing the network; and increasing the number of channels occupied by the fixed channel, so that the sending entity repeatedly transmits the synchronization signal and the number of broadcast information increases, thereby improving System coverage.

With reference to the second aspect, in a possible implementation manner, the fixed channel further includes a first guard interval, each of the two ends of each channel includes a first guard interval, and a bandwidth of each of the N channels is a second. The bandwidth, the first bandwidth is less than or equal to the second bandwidth; or the fixed channel further includes a second guard interval, and each of the two ends of the fixed channel includes a second guard interval.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the synchronization signal includes a PSS and an SSS, and the broadcast information includes a PBCH; wherein the SSS carries a PCI, or the PSS and the SSS carry a PCI; the PBCH carries A total number of data channels and/or a list of frequency hopping channels, the list of frequency hopping channels including a channel index of a data channel that can be used to transmit service data using frequency hopping techniques.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the broadcast information further includes a system information block SIB, where the SIB carries a total number of data channels and/or a frequency hopping channel list, or the PBCH and the SIB carry data. A total number of channels and/or a list of frequency hopping channels. Thereby, the resources occupied by the SIB on the data channel are reduced, the resources occupied by the PDSCH and the PDCCH on the data channel are increased, and the capacity and coverage capability of the system are improved.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the method further includes: determining at least two data channels that are sent by using a frequency hopping technique; receiving downlink data on the at least two data channels; and occupying M data channels Channel, M channels are adjacent, the bandwidth of each of the M channels is the first bandwidth, M is a positive integer greater than or equal to 1, the data channel carries the service data; in the time unit on the time domain, the data channel The duration of the occupation is T2, the sum of T1 and T2 is the duration of the time unit, and the data channel is time-divided with the fixed channel. Therefore, by increasing the number of channels occupied by the data channel, downlink data can be simultaneously transmitted to multiple receiving entities, and at the same time, multiple receiving entities can transmit uplink data on the same data channel, thereby effectively improving system coverage.

With reference to the foregoing possible implementation manners, in another possible implementation manner, receiving downlink data on the at least two data channels includes: receiving downlink data on the same logical channel on the at least two data channels, where the logical channel is The channel used for uplink transmission and downlink transmission among the M channels occupied by the data channel.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the method further includes: receiving first indication information, where the first indication information is used to indicate a logical channel.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the method further includes: receiving the second indication information, where the second indication information is used to indicate the updated logical channel.

A third aspect of the embodiments of the present application provides a wireless communication device, where the wireless communication device is a chip of a base station or a base station, and the wireless communication device includes: a sending unit, configured to send by using a fixed channel in the frequency domain based on the unlicensed spectrum resource. Synchronization signal and broadcast information; wherein the fixed channel occupies N channels, N channels are adjacent, the bandwidth of each channel of the N channels is the first bandwidth, and N is a positive integer greater than or equal to 2; in the time domain In the time unit, the duration of the synchronization signal and the broadcast information is T1, and T1 is less than the preset duration. The wireless communication apparatus provided by the embodiment of the present application increases the number of channels occupied by the fixed channel and reduces the duration of the synchronization signal and the broadcast information, so that the receiving entity quickly searches for the synchronization signal and the broadcast information, so that the receiving entity synchronizes to the cell. Accessing the network, thereby effectively reducing the delay of the receiving entity accessing the network; and increasing the number of channels occupied by the fixed channel, so that the transmitting entity repeatedly transmits the synchronization signal and the number of broadcast information increases, thereby improving the system coverage capability. .

With reference to the third aspect, in a possible implementation manner, the fixed channel further includes a first guard interval, each of the two ends of each channel includes a first guard interval, and a bandwidth of each of the N channels is a second. The bandwidth, the first bandwidth is less than or equal to the second bandwidth; or the fixed channel further includes a second guard interval, and each of the two ends of the fixed channel includes a second guard interval.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the broadcast information further includes an SIB, where the SIB carries a total number of data channels and/or a hopping channel list, or the PBCH and the SIB carry the total number of data channels and / or a list of frequency hopping channels.

In combination with the foregoing possible implementation manners, in another possible implementation, the sending unit is further configured to send downlink data on at least two data channels by using a frequency hopping technique; the data channel occupies M channels, and the M channels are adjacent to each other. The bandwidth of each channel of the M channels is the first bandwidth, and M is a positive integer greater than or equal to 1. In the time unit in the time domain, the duration occupied by the data channel is T2, and the sum of T1 and T2 is a time unit. The duration of the data channel is fixed with the fixed channel.

In combination with the foregoing possible implementation manners, in another possible implementation, the sending unit is further configured to send the first indication information, where the first indication information is used to indicate the logical channel, and the logical channel is the M channels occupied by the data channel. Channel for uplink transmission and downlink transmission.

In combination with the foregoing possible implementation manners, in another possible implementation manner, the sending unit is further configured to send the second indication information, where the second indication information is used to indicate the updated logical channel.

A fourth aspect of the embodiments of the present application provides a wireless communication device, where the wireless communication device is a chip of a terminal device or a terminal device, and the wireless communication device includes: a receiving unit, configured to fix in the frequency domain based on the unlicensed spectrum resource. The synchronization signal and the broadcast information are received on the channel; the fixed channel occupies N channels, and the N channels are adjacent, and the bandwidth of each of the N channels is the first bandwidth, and N is a positive integer greater than or equal to 2; in the time domain In the time unit, the duration of the synchronization signal and the broadcast information is T1, and T1 is less than the preset duration. The wireless communication apparatus provided by the embodiment of the present application increases the number of channels occupied by the fixed channel and reduces the duration of the synchronization signal and the broadcast information, so that the receiving entity quickly searches for the synchronization signal and the broadcast information, so that the receiving entity synchronizes to the cell. Accessing the network, thereby effectively reducing the delay of the receiving entity accessing the network; and increasing the number of channels occupied by the fixed channel, so that the transmitting entity repeatedly transmits the synchronization signal and the number of broadcast information increases, thereby improving the system coverage capability. .

With reference to the fourth aspect, in a possible implementation manner, the fixed channel further includes a first guard interval, each of the two ends of each channel includes a first guard interval, and a bandwidth of each of the N channels is a second. The bandwidth, the first bandwidth is less than or equal to the second bandwidth; or the fixed channel further includes a second guard interval, and each of the two ends of the fixed channel includes a second guard interval.

In combination with the foregoing possible implementation manner, in another possible implementation manner, the apparatus further includes: a processing unit, configured to determine at least two data channels that are sent by using a frequency hopping technology; and a receiving unit that is further configured to use the at least two data Receiving downlink data on the channel; the data channel occupies M channels, the M channels are adjacent, the bandwidth of each channel of the M channels is the first bandwidth, M is a positive integer greater than or equal to 1, and the data channel carries the service data; In the time unit on the time domain, the duration of the data channel is T2, the sum of T1 and T2 is the duration of the time unit, and the data channel is time-divided with the fixed channel.

In combination with the foregoing possible implementation manners, in another possible implementation, the receiving unit is specifically configured to: receive downlink data on the same logical channel on the at least two data channels, where the logical channel is the M channels occupied by the data channel. The channel used for uplink transmission and downlink transmission.

In combination with the foregoing possible implementation manner, in another possible implementation, the receiving unit is further configured to receive the first indication information, where the first indication information is used to indicate the logical channel.

In conjunction with the foregoing possible implementation manners, in another possible implementation manner, the receiving unit is further configured to receive the second indication information, where the second indication information is used to indicate the updated logical channel.

It should be noted that the foregoing third and fourth functional modules may be implemented by hardware, or may be implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above. For example, a transceiver for performing functions of a receiving unit and a transmitting unit, a processor for performing functions of the processing unit, a memory, and a program instruction for the processor to process the unlicensed spectrum based synchronization method of the embodiment of the present application. The processor, transceiver, and memory are connected by a bus and communicate with each other. Specifically, the function of sending the behavior of the entity in the unlicensed spectrum-based synchronization method provided by the first aspect, and the function of receiving the behavior of the entity in the unlicensed spectrum-based synchronization method provided by the second aspect may be referred to.

In a fifth aspect, an embodiment of the present application provides an apparatus, including: a processor, a memory, a bus, and a communication interface; the memory is configured to store a computer execution instruction, and the processor is connected to the memory through the bus, when the processor runs The processor executes the computer-executable instructions stored by the memory to cause the apparatus to perform the method of any of the above aspects.

In a sixth aspect, an embodiment of the present application provides a computer readable storage medium for storing computer software instructions for use in the above apparatus, and when executed on a computer, causes the computer to perform the method of any of the above aspects.

In a seventh aspect, an embodiment of the present application provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform the method of any of the above aspects.

In addition, the technical effects brought by the design manners of any one of the third aspect to the seventh aspect can be referred to the technical effects brought by the different design modes in the first aspect to the second aspect, and details are not described herein again.

In the embodiment of the present application, the names of the base station, the terminal device, and the wireless communication device are not limited to the device itself. In actual implementation, the devices may appear under other names. As long as the functions of the respective devices are similar to the embodiments of the present application, they are within the scope of the claims and their equivalents.

These and other aspects of the embodiments of the present application will be more readily understood in the following description of the embodiments.

DRAWINGS

FIG. 1 is a simplified schematic diagram of a communication system according to an embodiment of the present application;

2 is a schematic diagram of a time-frequency resource occupied by a fixed channel provided by the prior art;

FIG. 3 is a flowchart of a synchronization method based on an unlicensed spectrum according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a frequency domain resource occupied by a fixed channel according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of another frequency domain resource occupied by a fixed channel according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of time-frequency resources occupied by a fixed channel according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of channel division according to an embodiment of the present application;

FIG. 8 is a schematic diagram of another time-frequency resource occupied by a fixed channel according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of still another time-frequency resource occupied by a fixed channel according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of time-frequency resources occupied by a data channel according to an embodiment of the present disclosure;

FIG. 11 is a schematic diagram of another time-frequency resource occupied by a data channel according to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of a base station according to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of a device according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of another base station according to an embodiment of the present disclosure;

FIG. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure;

FIG. 16 is a schematic structural diagram of another terminal device according to an embodiment of the present disclosure.

Detailed ways

Embodiments of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

1 is a simplified schematic diagram of a communication system to which embodiments of the present application may be applied. As shown in FIG. 1, the communication system may include a base station 11 and a terminal device 12. The base station 11 and the terminal device 12 perform wireless communication with the network device 11.

The base station 11 may be a base station (BS) or a base station controller for wireless communication. Specifically, the base station may include a user plane base station and a control plane base station. A base station is a device deployed in a radio access network to provide wireless communication functions for the terminal device 12. Its main functions are: management of radio resources, compression of an Internet Protocol (IP) header, and user data flow. Encryption, selection of the Mobile Management Entity (MME) when the user equipment is attached, routing of user plane data to the Service Gateway (SGW), organization and transmission of paging messages, organization and transmission of broadcast messages, Configuration of measurement and measurement reports for mobility or scheduling purposes, and so on. The base station 11 can include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems using different radio access technologies, the names of devices with base station functions may be different, for example, in an LTE network, called an evolved base station (evolved NodeB, eNB or eNodeB), in the third generation. In the third generation Telecommunication (3G) system, it is called a base station (Node B), and in a next generation wireless communication system, it is called a next generation NodeB (gNB) or the like. As the communication technology evolves, the name "base station" may change. Moreover, in other possible cases, base station 11 may be other means of providing wireless communication functionality to terminal device 12. For convenience of description, in the embodiment of the present application, a device that provides a wireless communication function for the terminal device 12 is referred to as a base station.

The terminal device 12 may also be referred to as a terminal, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), or the like. The terminal device can be a mobile phone, a tablet (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, industrial control (industrial control) Wireless terminal, wireless terminal in self driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless in transport safety A terminal, a wireless terminal in a smart city, a wireless terminal in a smart home, and the like. The embodiments of the present application do not limit the specific technologies and specific device modes adopted by the terminal device. The terminal device 12 can also be a relay. In the embodiment of the present application, as shown in FIG. 1 , the terminal device 12 is used as a mobile phone as an example.

It should be noted that the communication system provided by the embodiment of the present application may refer to an unlicensed wireless communication system that is restricted by spectrum regulations. For example, an LTE-based system, an LTE (LAA-LTE) system including licensed spectrum assisted access, and an LTE system including unlicensed spectrum, such as a Standalone Unlicensed LTE system. The unlicensed spectrum-based synchronization method described in the embodiments of the present application is applicable to spectrum regulations below 1 GHz. For example, as shown in Table 1, the FCC's spectrum regulations impose the following constraints on devices using the 902 MHz-928 MHz band.

Table 1

According to Table 1, it can be obtained that in the US regulations, for digital modulation devices, each channel bandwidth (Bandwidth/Each channel) must be no less than 500 kHz, PSD is no more than 8 dBm/3 kHz, and transmit power ( Or called coducted power is not more than 30dBm, and the equivalent isotropic radiated power (EIRP) is not more than 36dBm. For an FHSS device with a channel number of not less than 25, the Dwell time (Each channel) of each channel needs to be 400 ms/100 s, and the transmission power is not more than 24 dBm. For FHSS devices with a channel number of not less than 50, the transmission power should be limited to a limit of not more than 30 dBm. In addition, in the US regulations, the mode that allows digital modulation and FHSS to be mixed, that is, a device can contain two working modes. When working in the digital modulation mode, the corresponding constraints of the digital modulation system must be observed, that is, the PSD limit is 8 dBm. /3kHz, the transmission power is not more than 30dBm, etc., and when working in FHSS mode, it must comply with the corresponding constraints of the FHSS system, that is, the transmission power needs to be no more than 24dBm, EIRP is not more than 24dBm (the number of channels is not less than 25) or the transmission power is not greater than 30dBm, EIRP is not more than 36dBm (the number of channels is not less than 50).

In addition, in the embodiments of the present application, the words "exemplary" or "such as" are used to mean an example, an illustration, or a description. Any embodiment or design described as "example" or "such as" in the embodiments of the present application should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the words "exemplary" or "such as" is intended to present a concept in a specific manner.

The network architecture and the service scenario described in the embodiments of the present application are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation of the technical solutions provided by the embodiments of the present application. The technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

It should be noted that the “connection” in the present application refers to that it can communicate with each other, and may be connected by a wired connection or a wireless connection, which is not specifically limited in the embodiment of the present application. The devices connected to each other may be directly connected to each other, or may be connected through other devices, which is not specifically limited in this embodiment.

In the existing communication system, as shown in FIG. 2, in the frequency domain, the fixed channel occupies a 1.4 MHz bandwidth; in the time domain, the reference signal is found to occupy 20 milliseconds (millisecond, ms) and the transmission period is 80 ms. If the terminal device fails to receive the discovery reference signal in one cycle, it needs to continuously search for the discovery reference signal in multiple cycles. Thus, since all DRSs are serially transmitted, and the transmission period of the DRS is long, the terminal device cannot be quickly synchronized. When the cell is connected to the cell, the delay of the terminal device accessing the network is long. In addition, the use of LBT technology is also not conducive to multi-subframe merging across the maximum channel occupancy time, reducing the system's coverage.

In order to enable the terminal device to quickly synchronize to the cell access network, the delay of the terminal device accessing the network is reduced, and the system coverage capability is improved. An embodiment of the present application provides a synchronization method based on an unlicensed spectrum, which is based on: based on an unlicensed spectrum resource, a fixed channel is used to transmit and receive a synchronization signal and broadcast information in a frequency domain; wherein a fixed channel occupies N channels. N channels are adjacent, and the bandwidth of each of the N channels is the first bandwidth, and N is a positive integer greater than or equal to 2; in the time unit in the time domain, the duration of the synchronization signal and the broadcast information is T1 , T1 is less than the preset duration. The transmitting entity that transmits the synchronization signal and the broadcast information may be a base station or a chip of the base station. The receiving entity that receives the synchronization signal and the broadcast information may be a terminal device or a chip of the terminal device. The unlicensed spectrum-based synchronization method provided by the embodiment of the present application increases the number of channels occupied by the fixed channel and reduces the duration of the synchronization signal and the broadcast information, so that the receiving entity quickly searches for the synchronization signal and the broadcast information, so that the receiving The entity synchronizes to the cell access network, thereby effectively reducing the delay of the receiving entity accessing the network; and increasing the number of channels occupied by the fixed channel, so that the sending entity repeatedly transmits the synchronization signal and the number of broadcast information increases, thereby improving System coverage.

For ease of understanding, the embodiment of the present application assumes that the sending entity is a base station, and the receiving entity is a terminal device. The communication between the base station and the terminal device is taken as an example for description.

FIG. 3 is a flowchart of a method for synchronizing unlicensed spectrum according to an embodiment of the present disclosure. As shown in FIG. 3, the method may include:

S301. The base station sends the synchronization signal and the broadcast information by using a fixed channel based on the unlicensed spectrum resource.

For a system operating on an unlicensed spectrum, in order to reduce the synchronization search delay when the terminal device initially accesses, the base station usually sends a synchronization signal and a broadcast information message at a pre-agreed fixed frequency point, and sends a synchronization signal and broadcast information. The fixed frequency of the message may be referred to as a fixed channel. A fixed channel can also be referred to as a common channel. Thereby, the synchronization signal and the broadcast information are transmitted on the fixed channel, so that the terminal device searches for the synchronization signal and the broadcast information at the time of blind detection, and performs a process such as random access. The frequency domain resources and time domain resources occupied by the fixed channel in the embodiments of the present application are all unlicensed spectrum resources.

In the frequency domain, the fixed channel occupies N channels, and the N channels are adjacent. The bandwidth of each of the N channels is the first bandwidth, and N is a positive integer greater than or equal to 2. In the time unit on the time domain, the duration of the synchronization signal and the broadcast information is T1, and T1 is less than the preset duration. The preset duration may be various durations as specified in the prior art, for example 20 ms. The time unit may be any one of a symbol, a time slot, a subframe, a radio frame, a superframe, a system message window, a system message period, and a system message change period. Of course, the time unit can also be a predefined time window. This embodiment of the present application does not limit this.

It should be noted that each of the N channels may include 12 subcarriers, and the interval of each subcarrier is 15 kHz, that is, the first bandwidth of the channel is 180 kHz. It can be understood that the first bandwidth is the effective transmission bandwidth of the channel or the effective bandwidth of the bearer signal.

In addition, the fixed channel may also include a guard interval. In an implementation manner, each of the two ends of each channel includes a first guard interval, and the first guard interval is half a subcarrier (7.5 kHz), so the second bandwidth of the channel in the frequency domain is 195 kHz (12 *15+7.5*2=195kHz). It can be understood that the second bandwidth is a channel interval, and in the frequency domain is an actual interval of the channel after the guard interval is added, and the first bandwidth is less than or equal to the second bandwidth. Assuming N=3, as shown in FIG. 4, the fixed channel has a bandwidth of 195*3=585 kHz.

In another implementation manner, the guard interval is not included between the channels, and each end of the fixed channel includes a second guard interval, and the second guard interval is 1.5 subcarriers (1.5*15=22.5 kHz). Assuming N=3, as shown in FIG. 5, the first bandwidth of the channel in the frequency domain is 180 kHz, and the bandwidth of the fixed channel is 585 kHz (12*15*3+22.5*2=585 kHz).

FIG. 6 is a schematic diagram of time-frequency resources occupied by a fixed channel according to an embodiment of the present disclosure. Assume that the bandwidth of the channel is equal to 195 kHz, N=3, that is, the bandwidth of the fixed channel is equal to 585 kHz, which is greater than 500 kHz. At this time, the rules for the base station to transmit the fixed channel comply with the FCC regulations. The time unit is a radio frame, the length of one radio frame is 10 ms, and one radio frame is composed of two 5 ms half frames. Each field consists of 5 subframes of length 1 ms, that is, one radio frame includes 10 subframes. The synchronization signal and the broadcast information can occupy the first two subframes in one radio frame, that is, the synchronization signal and the broadcast information occupy 2 ms, and the remaining 8 ms are idle. Even if the terminal device needs to search for the synchronization signal and the broadcast information in a plurality of cycles, the period in which the synchronization signal and the broadcast information are transmitted is short, thereby effectively reducing the delay of the terminal device accessing the network; and since the fixed channel is added The number of occupied channels increases the number of times the base station repeatedly transmits synchronization signals and broadcast information, thereby improving system coverage.

The synchronization signal includes PSS and SSS, and the broadcast information includes PBCH; wherein the SSS carries the PCI, or the PSS and the SSS carry the PCI; the PBCH carries the total number of data channels and/or the frequency hopping channel list. The total number of data channels can be understood as the number of data channels that can be used to transmit service data using frequency hopping techniques. The total number of data channels is configurable. For example, as shown in FIG. 7, it is assumed that for a system having a channel bandwidth of 195 kHz, there may be ((928-902)*1000)/195=133 channels (carrier frequency points) in the 902 MHz-928 MHz band. The 133 channels are divided into groups of 3 channels to obtain ((928-902)*1000)/585=44 channel groups. It is assumed that 4 channel groups are reserved as fixed channels, and the other 40 channel groups are used as data channels. For example, channel group 5, channel group 16, channel group 27, and channel group 38 can serve as fixed channels. The other channel groups serve as data channels. At this time, the total number of data channels is 40. Of course, the present invention is only an example, and other data may be used in the actual application. The embodiment of the present application is not limited herein. The frequency hopping channel list includes a channel index of a data channel that can be used to transmit service data using a frequency hopping technique.

In the prior art, the data channel is usually used to carry the SIB, which causes the SIB to occupy a large amount of resources on the data channel. On the other hand, the resources for transmitting the PDSCH and the PDCCH on the data channel are less, which reduces the capacity and coverage of the system. The broadcast information of the embodiment of the present application may further include an SIB, thereby reducing resources occupied by the SIB on the data channel, increasing resources occupied by the PDSCH and the PDCCH on the data channel, and improving the capacity and coverage capability of the system. In the case that the broadcast information further includes the SIB, the SIB may carry the total number of data channels and/or the frequency hopping channel list, or the PBCH and the SIB together carry the total number of data channels and/or the frequency hopping channel list.

Optionally, the PBCH or the SIB may further include a channel number indication information, where the channel number indication information is used to indicate whether the data channel includes multiple channels. For example, the PBCH or SIB includes one bit. When the bit is 1, it indicates that the data channel includes multiple channels; when the bit is 0, it indicates that the data channel includes one channel. Further, the PBCH or SIB may further include a bit for indicating the number of channels included in the data channel.

Optionally, the channel number indication information may be implicitly indicated by the PSS or SSS sequence, that is, the terminal device determines whether the data channel includes multiple channels by blindly detecting different PSS or SSS sequences. For example, two PSS sequences are preset, such as PSS sequence 1 and PSS sequence 2. When the terminal device performs the synchronization detection, when the PSS sequence 1 is blindly detected, it indicates that the data channel includes one channel, and when the terminal device blindly detects the PSS In sequence 2, it indicates that the data channel includes a plurality of channels; further, the number of sequences of the PSS or SSS may be increased to implicitly indicate the number of channels included in the data channel.

It should be noted that the PSS, the PBCH, or the SIB each occupy a channel of the first bandwidth, and the SSS may occupy the same channel of the first bandwidth with the PBCH or the PSS, and the PSS, the PBCH, and the SIB are adjacently arranged in the frequency domain.

FIG. 8 is a schematic diagram of another time-frequency resource occupied by a fixed channel according to an embodiment of the present disclosure. The first logical channel of the three channels occupied by the fixed channel carries the PSS, and the second logical channel of the three channels occupied by the fixed channel carries the PBCH and the SSS, and the third logical channel carries the three of the three channels occupied by the fixed channel. There is an SIB. It should be noted that the logical channel carrying the PBCH and the SSS carries the three PBCHs and one SSS in a periodic manner, that is, after carrying three PBCHs, one SSS is carried, and after three PBCHs are carried, one SSS is carried. Each PBCH occupies two subframes in one radio frame, that is, the duration of the PBCH is 2 ms. Each SSS occupies two subframes in one radio frame, that is, the duration occupied by the SSS is 2 ms. Each PSS occupies two subframes in one radio frame, that is, the duration occupied by the PSS is 2 ms.

Of course, the SSS can be carried on the same logical channel as the PSS in the fixed channel. As shown in FIG. 9, the first logical channel of the three channels occupied by the fixed channel carries the PSS and the SSS, and the second logical channel of the three channels occupied by the fixed channel carries the PBCH, and the three channels occupied by the fixed channel are included. The third logical channel carries the SIB. It should be noted that the logical channel carrying the PSS and the SSS carries the three PSSs and one SSS as the periodic bearer, that is, carrying one PSS after carrying three PSSs, and carrying one SSS after carrying three PSSs. Each PBCH occupies two subframes in one radio frame, that is, the duration of the PBCH is 2 ms. Each SSS occupies two subframes in one radio frame, that is, the duration occupied by the SSS is 2 ms. Each PSS occupies two subframes in one radio frame, that is, the duration occupied by the PSS is 2 ms.

S302. The terminal device receives the synchronization signal and the broadcast information on the fixed channel.

The terminal device first searches for the PSS at the frequency position of the pre-agreed fixed channel. After acquiring the PSS, the terminal device obtains the subframe boundary of the system; then, the terminal device continues to search for the SSS on the fixed channel, and obtains the PSS and the SSS. Cell identification. Then, the PBCH and the SIB are searched on the fixed channel to obtain necessary system messages, including the total number of data channels and/or the frequency hopping channel list, and based on the information, the terminal device can calculate the frequency hopping position of the data channel. After obtaining the synchronization and broadcast information, the terminal device may randomly determine a logical channel for random access on the data channel according to the indication of the base station, and initiate random access to the base station on the logical channel to communicate with the base station.

S303. The base station sends downlink data on at least two data channels by using a frequency hopping technique.

The frequency domain resources and time domain resources occupied by the data channel are unlicensed spectrum resources. In the frequency domain, the data channel occupies M channels, M channels are adjacent, and M is a positive integer greater than or equal to 1. In the time unit on the time domain, the duration of the data channel is T2, and the sum of T1 and T2 is the duration of the time unit. It should be noted that the data channel carries service data. The data channel is time-divided with the fixed channel. It can be understood that the duration occupied by the data channel does not overlap with the duration occupied by the fixed channel. For a specific explanation of the bandwidth of the channel, refer to the detailed explanation in S301, and the interpretation of the channel included in the data channel and the data channel is similar to the division of the fixed channel. For the explanation of the fixed channel in S301, the embodiment of the present application is no longer Narration.

FIG. 10 is a schematic diagram of time-frequency resources occupied by a data channel according to an embodiment of the present disclosure. Assume that the bandwidth of the channel is equal to 195 kHz, M = 3, that is, the bandwidth of the data channel is equal to 585 kHz. The time unit is a radio frame, the length of one radio frame is 10 ms, and one radio frame is composed of two 5 ms half frames. Each field consists of 5 subframes of length 1 ms, that is, one radio frame includes 10 subframes. The synchronization signal and the broadcast information occupy two subframes in the radio frame, that is, the synchronization signal and the broadcast information occupy 2 ms. The data channel occupies the other eight subframes in the radio frame, and the data channel occupies 8 ms. Therefore, by increasing the number of channels occupied by the data channel, the base station simultaneously transmits downlink data to multiple terminal devices, and at the same time, multiple terminal devices can send uplink data to the base station in the same data channel, thereby effectively improving system coverage.

It should be noted that, in a possible implementation manner, carriers occupied by channels occupied by different data channels in at least two data channels are completely different. For example, in FIG. 10, the carrier carried by the channel occupied by the data channel in the second radio frame is completely different from the carrier carried by the channel occupied by the data channel in the third radio frame.

In another possible implementation manner, a carrier portion occupied by a channel occupied by different data channels in at least two data channels is the same. For example, in FIG. 11, the carrier carried by the first channel occupied by the data channel in the second radio frame is the same as the carrier carried by the second channel occupied by the data channel in the third radio frame, in the first radio frame. The carrier carried by the third channel occupied by the medium data channel is the same as the carrier carried by the first channel occupied by the data channel in the third radio frame.

In addition, the time unit includes a switching point, which is a switching point of the uplink and the downlink. It should be noted that the switching point information included in the time unit can be pre-scheduled at the terminal device and the base station. The uplink refers to the physical path of the signal from the terminal device to the base station. The downlink refers to the physical channel of the signal from the base station to the terminal device. It can be understood that the time unit includes a switching point, that is, a period of time unit, and the uplink and the downlink only change once in each period. For example, assume that the time unit is a radio frame. A radio frame has a length of 10 ms, including 10 subframes, and one subframe has a length of 1 ms. The last 8 subframes of a radio frame are used for transmitting data channels, the data channel includes an uplink and a downlink, and the 8 subframes include an uplink and downlink switching point. As shown in Table 2, an uplink and downlink subframe configuration table is provided in this embodiment of the present application.

Table 2

The radio frame includes 10 subframes from subframe 0 to subframe 9, and 0-9 is a subframe number, and each subframe includes symbols 0 to 13. The uplink and downlink subframe configuration shown in Table 2 may include 12 uplink-downlink configurations (UL-DL Configuration). "U" is used to indicate a subframe in which an uplink signal is transmitted, that is, an uplink subframe, for transmitting uplink data. "D" is used to indicate a subframe in which a downlink signal is transmitted, that is, a downlink subframe, and can be used to transmit a synchronization signal, broadcast information, and downlink data. "S" is used to provide a guard interval or a sub-frame providing data transmission, that is, a special subframe. The special subframe in this embodiment of the present application can understand the switching points of the uplink and the downlink. Subframe 0 and subframe 1 in each configuration may be used to transmit synchronization signals and broadcast information, and subframe 2 to subframe 9 may be used to transmit uplink data or downlink data.

It can be seen from the 12 types of uplink and downlink subframe configurations shown in Table 2,

In UL-DL(0), subframe 2 - subframe 7 can be used to transmit an uplink signal, and subframe 9 is used to transmit a downlink signal, and subframe 2 - subframe 9 includes an uplink and a downlink. The switching point, that is, subframe 8.

In UL-DL (1), subframe 2 - subframe 6 can be used to transmit an uplink signal, and subframe 8 - subframe 9 is used to transmit a downlink signal, and subframe 2 - subframe 9 includes an uplink. The switching point with the downlink, that is, subframe 7.

In UL-DL (2), subframe 2 - subframe 5 can be used to transmit an uplink signal, and subframe 7 - subframe 9 is used to transmit a downlink signal, and subframe 2 - subframe 9 includes an uplink. The switching point with the downlink, that is, subframe 6.

In UL-DL (3), subframe 2 - subframe 4 can be used to transmit an uplink signal, and subframe 5 - subframe 9 is used to transmit a downlink signal, and subframe 2 - subframe 9 includes an uplink. The switching point with the downlink, that is, subframe 5.

In UL-DL (4), subframe 2 - subframe 3 can be used to transmit an uplink signal, and subframe 4 - subframe 9 is used to transmit a downlink signal, and subframe 2 - subframe 9 includes an uplink. The switching point with the downlink, that is, subframe 4.

In UL-DL (5), subframe 2 - subframe 3 can be used to transmit an uplink signal, and subframe 4 - subframe 9 is used to transmit a downlink signal, and subframe 2 - subframe 9 includes an uplink. The switching point with the downlink, that is, subframe 3.

In addition, the UL-DL (6) to UL-DL (11) configuration differs from the UL-DL (0) to UL-DL (5) in that the uplink subframe is opposite to the downlink subframe. The switching point of UL-DL (6) is subframe 8, the switching point of UL-DL (7) is subframe 7, the switching point of UL-DL (8) is subframe 6, and the switching of UL-DL (9) The point is subframe 5, the switching point of UL-DL (10) is subframe 4, and the switching point of UL-DL (11) is subframe 3.

S304. The terminal device determines at least two data channels that are sent by using a frequency hopping technology.

The terminal device obtains the available frequency hopping channel list and frame number information through the PBCH and the SIB, and calculates the frequency point information corresponding to each frame number by using a pseudo random frequency hopping algorithm according to the available data channel and frame number information included in the frequency hopping channel list. Thereby determining the data channel. The method for determining the data channel of the terminal device can be referred to the prior art, and details are not described herein again.

S305. The terminal device receives downlink data on at least two data channels.

Communicating with the base station on the same logical channel on at least two of the data channels. The logical channel is a channel used by the terminal for uplink transmission and downlink transmission among the M channels occupied by the data channel. The same logical channel on at least two data channels can be understood as the logical channels included in each data channel are sorted according to the same rule, and the logical channels having the same sequence number in the sorted logical channels are the same logical channel. For example, the terminal device initiates random access on the first logical channel of the first data channel and communicates with the base station, after which the terminal device communicates with the base station on other data channels as well as the first of the other data channels. The logical channel communicates with the base station, the logical channel is unchanged, such as communicating with the base station on the first logical channel of the second data channel, and communicating with the base station on the first logical channel of the third data channel. Further, when the terminal device performs random access and sends uplink data to the base station, the logical channel used for receiving the downlink data is still used for random access and uplink data is sent.

It should be noted that, on which logical channel on the data channel the terminal device communicates with the base station, the communication may be pre-defined, that is, the logical channel used by the terminal device for random access is pre-agreed, and the terminal device initiates random connection to the base station on the corresponding logical channel. Incoming and communicating with the base station. Optionally, the terminal device may also randomly select any one of the data channels to initiate random access to the base station and perform data transmission with the base station. Certainly, the logical channel used may be determined according to the first indication information sent by the base station, where the first indication information indicates a logical channel used by the terminal device to communicate with the base station on the data channel. The first indication information may be carried in the broadcast information. Further, the base station may further send the second indication information to the terminal device by using radio resource control (RRC) signaling, where the second indication information is used to indicate the updated logical channel. After receiving the second indication information, the terminal device may communicate with the base station according to the updated logical channel indicated by the second indication information, and no longer communicate with the base station by using the logical channel indicated by the first indication information.

The solution provided by the embodiment of the present application is mainly introduced from the perspective of interaction between the network elements. It can be understood that each network element, such as a base station and a terminal device, in order to implement the above functions, includes hardware structures and/or software modules corresponding to each function. Those skilled in the art will readily appreciate that the present application can be implemented in a combination of hardware or hardware and computer software in combination with the algorithmic steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

The embodiments of the present application may divide the functional modules of the base station and the terminal device according to the foregoing method. For example, each functional module may be divided according to each function, or two or more functions may be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.

FIG. 12 is a schematic diagram showing a possible composition of the base station involved in the foregoing and the embodiment. As shown in FIG. 12, the base station may include: a sending unit 1201.

The sending unit 1201 is configured to support the base station to perform S301 and S303 in the unlicensed spectrum-based synchronization method shown in FIG. 3.

It should be noted that all the related content of the steps involved in the foregoing method embodiments may be referred to the functional descriptions of the corresponding functional modules, and details are not described herein again.

The base station provided by the embodiment of the present application is configured to perform the foregoing unlicensed spectrum-based synchronization method, so that the same effect as the foregoing unlicensed spectrum-based synchronization method can be achieved.

FIG. 13 is a schematic structural diagram of a base station according to an embodiment of the present disclosure. As shown in FIG. 13, the base station may include at least one processor 1301, a memory 1302, a transceiver 1303, and a bus 1304.

The following describes the components of the base station in detail with reference to FIG. 13:

The processor 1301 is a control center of the base station, and may be a processor or a collective name of a plurality of processing elements. For example, the processor 1301 is a central processing unit (CPU), may be an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application. For example, one or more microprocessors (Digital Signal Processors, DSPs), or one or more Field Programmable Gate Arrays (FPGAs).

Among other things, the processor 1301 can perform various functions of the base station by running or executing a software program stored in the memory 1302 and calling data stored in the memory 1302.

In a particular implementation, as an embodiment, processor 1301 may include one or more CPUs, such as CPU0 and CPU1 shown in FIG.

In a particular implementation, as an embodiment, the base station can include multiple processors, such as processor 1301 and processor 1305 shown in FIG. Each of these processors can be a single core processor (CPU) or a multi-core processor (multi-CPU). A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data, such as computer program instructions.

The memory 1302 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type that can store information and instructions. The dynamic storage device can also be an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical disc storage, and a disc storage device. (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be Any other media accessed, but not limited to this. The memory 1302 can exist independently and is coupled to the processor 1301 via a bus 1304. The memory 1302 can also be integrated with the processor 1301.

The memory 1302 is configured to store a software program that executes the solution of the present application, and is controlled by the processor 1301 for execution.

The transceiver 1303 is configured to communicate with other devices or communication networks. For example, it is used for communication with a communication network such as an Ethernet, a radio access network (RAN), or a wireless local area network (WLAN). The transceiver 1303 can include all or part of a baseband processor, and can also optionally include an RF processor. The RF processor is used to transmit and receive RF signals, and the baseband processor is used to implement processing of a baseband signal converted by an RF signal or a baseband signal to be converted into an RF signal.

The bus 1304 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 13, but it does not mean that there is only one bus or one type of bus.

The device structure shown in FIG. 13 does not constitute a limitation to a base station, and may include more or less components than those illustrated, or some components may be combined, or different component arrangements.

In the case of employing an integrated unit, FIG. 14 shows another possible composition diagram of the base station involved in the above embodiment. As shown in FIG. 14, the base station includes a processing module 1401 and a communication module 1402.

Processing module 1401 is for controlling management of the actions of the base station and/or other processes for the techniques described herein. Communication module 1402 is for supporting communication between the base station and other network entities, such as with the functional modules or network entities illustrated in FIG. 1, FIG. 13, FIG. 15, or FIG. Specifically, for example, the communication module 1402 is configured to support the base station to perform S301 and S303 in FIG. The base station may further include a storage module 1403 for storing program codes and data of the base station.

The processing module 1401 can be a processor or a controller. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor can also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication module 1402 can be a transceiver, a transceiver circuit, a communication interface, or the like. The storage module 1403 may be a memory.

When the processing module 1401 is a processor, the communication module 1402 is a transceiver, and the storage module 1403 is a memory, the base station involved in the embodiment of the present application may be the device shown in FIG.

FIG. 15 is a schematic diagram showing a possible configuration of the terminal device involved in the foregoing embodiment. As shown in FIG. 15, the terminal device may include: a receiving unit 1501. .

The receiving unit 1501 is configured to support the terminal device to perform S302 and S305 in the unlicensed spectrum-based synchronization method shown in FIG. 3.

In the embodiment of the present application, further, as shown in FIG. 15, the terminal device may further include: a processing unit 1502.

The processing unit 1502 is configured to support the terminal device to perform S304 in the unlicensed spectrum-based synchronization method shown in FIG. 3.

The terminal device provided by the embodiment of the present application is configured to perform the foregoing unlicensed spectrum-based synchronization method, so that the same effect as the foregoing unlicensed spectrum-based synchronization method can be achieved.

In the case of employing an integrated unit, FIG. 16 shows another possible composition diagram of the terminal device involved in the above embodiment. As shown in FIG. 16, the terminal device includes: a processing module 1601 and a communication module 1602.

The processing module 1601 is for controlling management of actions of the terminal device and/or other processes for the techniques described herein. The communication module 1602 is for supporting communication between the terminal device and other network entities, such as communication with the functional modules or network entities shown in FIG. 1, FIG. 12, FIG. 13, or FIG. Specifically, for example, the communication module 1602 is configured to support the terminal device to perform S302 and S305 in FIG. 3. The terminal device may further include a storage module 1603 for storing program codes and data of the terminal device.

The processing module 1601 can be a processor or a controller. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor can also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication module 1602 can be a transceiver, a transceiver circuit, a communication interface, or the like. The storage module 1603 can be a memory.

When the processing module 1601 is a processor, the communication module 1602 is a transceiver, and the storage module 1603 is a memory, the terminal device involved in the embodiment of the present application may be the device shown in FIG.

Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above functional modules is illustrated. In practical applications, the above functions can be allocated according to needs. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be used. The combination may be integrated into another device, or some features may be ignored or not performed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may be one physical unit or multiple physical units, that is, may be located in one place, or may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be embodied in the form of a software product in the form of a software product in essence or in the form of a contribution to the prior art, and the software product is stored in a storage medium. A number of instructions are included to cause a device (which may be a microcontroller, chip, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. . Therefore, the scope of protection of the present application should be determined by the scope of the claims.

Claims

A synchronization method based on an unlicensed spectrum, wherein the method is applied to a chip of a base station or a base station, and the method includes:

And transmitting, according to the unlicensed spectrum resource, a synchronization signal and a broadcast information by using a fixed channel in a frequency domain; the fixed channel occupies N channels, the N channels are adjacent, and a bandwidth of each of the N channels is a A bandwidth, N is a positive integer greater than or equal to 2; in a time unit in the time domain, the synchronization signal and the broadcast information occupy a duration of T1.
The method according to claim 1, wherein the fixed channel further comprises a first guard interval, and each of the two ends of each channel includes the first guard interval;

Alternatively, the fixed channel further includes a second guard interval, and each of the two ends of the fixed channel includes the second guard interval.
The method according to claim 1 or 2, wherein the synchronization signal comprises a primary synchronization signal PSS and a secondary synchronization signal SSS, and the broadcast information comprises a physical downlink broadcast channel PBCH;

The SSS carries a physical cell identifier PCI, or the PSS and the SSS carry the PCI; the PBCH carries a total number of data channels and/or a frequency hopping channel list, and the frequency hopping channel The list includes the channel index of the data channel that can be used to transmit service data using frequency hopping techniques.
The method according to claim 3, wherein the broadcast information further comprises a system information block SIB, wherein the SIB carries a total number of data channels and/or a frequency hopping channel list, or the PBCH and SIB bearers There is a total number of data channels and/or a list of frequency hopping channels.
The method according to any one of claims 1 to 4, wherein the method further comprises:

Transmitting downlink data on at least two data channels by using a frequency hopping technique; the data channel occupies M channels, the M channels are adjacent, and a bandwidth of each of the M channels is the first bandwidth, M is a positive integer greater than or equal to 1; in a time unit in the time domain, the data channel occupies a duration T2, the sum of T1 and T2 is the duration of the time unit, and the data channel and the fixed channel are time-divided .
The method according to claim 5, wherein the data channel further comprises the first guard interval, and each of the two ends of each channel includes the first guard interval;

Or the data channel further includes the second guard interval, and each of the two ends of the data channel includes the second guard interval.
The method according to claim 6, wherein the carriers occupied by the channels occupied by different data channels in the at least two data channels are completely different, or between different data channels in the at least two data channels. The occupied channel carries the same carrier portion.
The method of claim 7 wherein said time unit comprises a switching point, said switching point being a switching point for the uplink and the downlink.
The method of any of claims 5-8, wherein the method further comprises:

Sending first indication information, where the first indication information is used to indicate a logical channel, where the logical channel is a channel for uplink transmission and downlink transmission among M channels occupied by the data channel.
The method of claim 9 wherein the method further comprises:

Sending second indication information, where the second indication information is used to indicate the updated logical channel.
The method of any of claims 1-10, wherein the first bandwidth is greater than or equal to 180 kHz and the fixed channel has a bandwidth greater than or equal to 500 kHz.
A synchronization method based on an unlicensed spectrum, wherein the method is applied to a chip of a terminal device or a terminal device, and the method includes:

Receiving a synchronization signal and broadcast information on a fixed channel in a frequency domain based on an unlicensed spectrum resource; the fixed channel occupies N channels, the N channels are adjacent, and a bandwidth of each of the N channels is The first bandwidth, N is a positive integer greater than or equal to 2; in the time unit in the time domain, the synchronization signal and the broadcast information occupy a duration of T1.
The method according to claim 12, wherein the fixed channel further comprises a first guard interval, and each of the two ends of each channel includes the first guard interval;

Alternatively, the fixed channel further includes a second guard interval, and each of the two ends of the fixed channel includes the second guard interval.
The method according to claim 12 or 13, wherein the synchronization signal comprises a primary synchronization signal PSS and a secondary synchronization signal SSS, and the broadcast information comprises a physical downlink broadcast channel PBCH;

The SSS carries a physical cell identifier PCI, or the PSS and the SSS carry the PCI; the PBCH carries a total number of data channels and/or a frequency hopping channel list, and the frequency hopping channel The list includes the channel index of the data channel that can be used to transmit service data using frequency hopping techniques.
The method according to claim 14, wherein the broadcast information further comprises a system information block SIB, wherein the SIB carries a total number of data channels and/or a frequency hopping channel list, or the PBCH and SIB bearers. There is a total number of data channels and/or a list of frequency hopping channels.
The method of any of claims 12-15, wherein the method further comprises:

Determining at least two data channels transmitted by frequency hopping techniques;

Receiving downlink data on the at least two data channels; the data channel occupies M channels, the M channels are adjacent, and a bandwidth of each of the M channels is the first bandwidth, where M is a positive integer greater than or equal to 1, the data channel carrying service data; in a time unit in the time domain, the data channel occupies a duration of T2, and the sum of T1 and T2 is a duration of a time unit, the data The channel is time-divided with the fixed channel.
The method according to claim 16, wherein the data channel further comprises the first guard interval, and each of the two ends of each channel includes the first guard interval;

Or the data channel further includes the second guard interval, and each of the two ends of the data channel includes the second guard interval.
The method according to claim 17, wherein the carriers occupied by the channels occupied by different data channels in the at least two data channels are completely different, or between different data channels in the at least two data channels. The occupied channel carries the same carrier portion.
The method of claim 18 wherein said time unit comprises a switching point, said switching point being a switching point for the uplink and the downlink.
The method according to any one of claims 16 to 19, wherein the receiving downlink data on the at least two data channels comprises:

And receiving downlink data on the same logical channel on the at least two data channels, where the logical channel is a channel for uplink transmission and downlink transmission among M channels occupied by the data channel.
The method of claim 20, wherein the method further comprises:

Receiving first indication information, where the first indication information is used to indicate the logical channel.
The method of claim 21, wherein the method further comprises:

Receiving second indication information, where the second indication information is used to indicate the updated logical channel.
The method according to any one of claims 12 to 22, wherein the first bandwidth is greater than or equal to 180 kHz and the fixed channel has a bandwidth greater than or equal to 500 kHz.
An apparatus comprising: at least one processor, and a memory; wherein

The memory is for storing a computer program, such that when the computer program is executed by the at least one processor, the unlicensed spectrum based synchronization method according to any one of claims 1-11 or claims 12-23 The unlicensed spectrum based synchronization method described in any one of the preceding claims.
A computer storage medium having stored thereon a computer program, characterized in that the program is executed by a processor to implement an unlicensed spectrum based synchronization method according to any one of claims 1-11 or claim 12. The unlicensed spectrum based synchronization method according to any one of the preceding claims.