WO2015109524A1

WO2015109524A1 - Method and device for transmitting synchronisation signal

Info

Publication number: WO2015109524A1
Application number: PCT/CN2014/071363
Authority: WO
Inventors: 刘德平
Original assignee: 华为技术有限公司
Priority date: 2014-01-24
Filing date: 2014-01-24
Publication date: 2015-07-30
Also published as: CN105379375A

Abstract

Disclosed are a method and device for transmitting a synchronisation signal, relating to the technical field of communications, and capable of implementing synchronous communication of terminal devices within and outside of a network coverage range, thereby reducing the difficulty of contact between users within and outside of the network coverage range. The method comprises: a second terminal device transmits a wake-up signal; a first terminal device receives the wake-up signal transmitted by the second terminal device; the first terminal device transmits a synchronisation signal; the second terminal device receives the synchronisation signal transmitted by the first terminal device, and performs synchronisation with the first terminal device. The present invention is suitable for a scenario wherein terminal devices within and outside of a network coverage range perform synchronous communication, and also for a scenario wherein terminal devices in different cells within a network implement synchronisation.

Description

Method and device for transmitting synchronization signal

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

Background technique

D2D (Device to Device) refers to direct communication between terminal devices or direct communication with the assistance of the network. D2D has three working scenarios, namely network coverage, no network coverage and partial network coverage. In the network coverage working scenario, the terminal devices participating in D2D communication are within the coverage of the network; in the scenario without network coverage, participation The terminal devices of the D2D communication are all in the coverage of the network; in the scenario of partial network coverage, a part of the terminal devices participating in the D2D communication are within the coverage of the network, and another part of the terminal devices are outside the coverage of the network. The two communicating parties of the synchronous communication need to establish synchronization first, and adjust the frequency and timing of the two terminal devices to the same frequency and time. Synchronization requires a common synchronization reference between the two terminal devices communicating, which is the device that provides the synchronization reference. In the working scenario of network coverage, the prior art uses the base stations in the network as a synchronization source, and the terminal devices synchronized to the base station form a group. In a work scenario without network coverage, one of the plurality of terminal devices without network coverage in the prior art is used as a synchronization source, and other terminal devices synchronized to the terminal device form a group.

However, the prior art is not able to generate a group of partial network coverage, and the partially covered group helps to reduce the interference of the network coverage boundary and enhance the synchronization precision. In a part of the network coverage work scenario, some terminal devices are within the network coverage, and another terminal device is outside the network coverage. The terminal devices outside the network coverage cannot discover the terminal devices within the network coverage and perform synchronous communication. , increasing the difficulty of connecting users inside and outside the network coverage. For example: In the event of an earthquake or snowstorm, users in the disaster area outside the network coverage cannot use the terminal equipment to communicate effectively with users in the network coverage of the outside world, which improves rescue or other work. Difficulty.

Summary of the invention

Embodiments of the present invention provide a method and an apparatus for transmitting a synchronization signal, which can implement synchronous communication of terminal devices inside and outside the network coverage in a working scenario of partial network coverage, and reduce users in and out of the network coverage. The difficulty of the connection.

In order to achieve the above object, an embodiment of the present invention uses the following technical solution: In a first aspect, an embodiment of the present invention provides a device for transmitting a synchronization signal, where the first terminal device is in a network coverage. Terminal device, the device includes:

a receiving module, configured to receive, by the first terminal device, a wake-up signal sent by the second terminal device, where the wake-up signal is used to trigger the terminal device to transmit a synchronization signal;

a transmitting module, configured to send, by the first terminal device, the synchronization signal.

With reference to the first aspect, in a first possible implementation, the receiving module includes:

And a receiving unit, configured to receive, by the first terminal device, the wake-up signal sent by the second terminal device at a predetermined time.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the predetermined time is a preset time set or a time period set.

With reference to the first aspect, the first or the second possible implementation manner of the first aspect, in a third possible implementation manner, the wake-up signal carries group ID information, and the group ID and the carried by the wake-up signal The group ID of the first terminal device is the same.

With the first aspect, the first or the second possible implementation of the first aspect, in a fourth possible implementation, the wake-up signal includes synchronization priority information, and the sending module includes:

a first transmitting unit, configured to: when the priority of the synchronization signal to be transmitted of the first terminal device is higher than a synchronization priority of the wake-up signal, the first terminal device transmits the synchronization signal to be transmitted.

With reference to the first aspect, any one of the first to the fourth possible implementations of the first aspect, in a fifth possible implementation, the device further includes: a random number module, configured to generate a random number by the first terminal device;

a determining module, determining whether the random number satisfies a preset condition;

The transmitting module includes:

a second transmitting unit, configured to: when the random number meets the preset condition, the first terminal device transmits the synchronization signal to be transmitted.

In a second aspect, an embodiment of the present invention provides a device for transmitting a synchronization signal, which is used for a second terminal device, where the device includes:

a transmitting module, configured to send, by the second terminal device, a wake-up signal, where the wake-up signal is used to trigger the terminal device to transmit a synchronization signal;

The receiving module is configured to receive a synchronization signal sent by the first terminal device, and synchronize with the first terminal device.

With reference to the second aspect, in a first possible implementation manner, the second terminal device has no network connection.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the wake-up signal carries group ID information, and the group ID carried by the wake-up signal is related to the first terminal. The device's group ID is the same.

In conjunction with the second aspect or the first possible implementation of the second aspect, in a third possible implementation, the wake-up signal includes synchronization priority information.

In a third aspect, the embodiment of the present invention provides a method for transmitting a synchronization signal, where the first terminal device is a terminal device in a network coverage, and the method includes:

Receiving, by the first terminal device, a wake-up signal sent by the second terminal device, where the wake-up signal is used to trigger the terminal device to transmit a synchronization signal;

The first terminal device transmits a synchronization signal.

With reference to the third aspect, in a first possible implementation, the receiving, by the first terminal device, the wake-up signal sent by the second terminal device includes:

The first terminal device receives the wake-up signal transmitted by the second terminal device at a predetermined time.

Combined with the first possible implementation of the third aspect, in the second possible implementation In the mode, the predetermined time is a preset time set or a time period set.

With reference to the third aspect, the first or the second possible implementation manner of the third aspect, in a third possible implementation manner, the wake-up signal carries group ID information, and the group ID and the carried by the wake-up signal The group ID of the first terminal device is the same.

With reference to the third aspect, the first or the second possible implementation manner of the third aspect, in a fourth possible implementation manner, the wake-up signal includes synchronization priority information; the first terminal device transmits a synchronization signal , including:

When the priority of the synchronization signal to be transmitted of the first terminal device is higher than the synchronization priority of the wake-up signal, the first terminal device transmits the synchronization signal to be transmitted.

With reference to the third aspect, any one of the first to the fourth possible implementation manners of the third aspect, in a fifth possible implementation manner, before the first terminal device transmits the synchronization signal to be transmitted , including:

The first terminal device generates a random number;

Determining whether the random number satisfies a preset condition;

The transmitting, by the first terminal device, the synchronization signal to be transmitted includes:

When the random number satisfies the preset condition, the first terminal device transmits the synchronization signal to be transmitted.

In a fourth aspect, the embodiment of the present invention provides a method for transmitting a synchronization signal, which is used in a second terminal device, where the method includes:

The second terminal device transmits a wake-up signal, where the wake-up signal is used to trigger the terminal device to transmit a synchronization signal;

Receiving a synchronization signal transmitted by the first terminal device, and synchronizing with the first terminal device.

In conjunction with the fourth aspect, in a first possible implementation, the second terminal device has no network connection.

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in a second possible implementation manner, the wake-up signal carries group ID information, a group ID carried by the wake-up signal, and the first terminal The device's group ID is the same.

In combination with the fourth aspect or the first possible implementation of the fourth aspect, in the third In a possible implementation manner, the wake-up signal includes synchronization priority information.

The method and device for transmitting a synchronization signal provided by the embodiment of the present invention, the second terminal device can transmit the wake-up signal, the first terminal device receives the wake-up signal, and transmits the synchronization signal, and the second terminal device receives the synchronization transmitted by the first terminal device. Signal and synchronize with the first terminal device. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Precision.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without any creative work.

FIG. 1 is a schematic structural diagram of an apparatus for transmitting a synchronization signal according to an embodiment of the present invention;

2 is a schematic structural diagram of a specific implementation manner of an apparatus for transmitting a synchronization signal according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another specific implementation manner of an apparatus for transmitting a synchronization signal according to an embodiment of the present disclosure;

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

5 is a schematic structural diagram of a terminal device according to an embodiment of the present invention; FIG. 6 is a schematic structural diagram of another terminal device according to an embodiment of the present invention; FIG. 7 is a schematic diagram of transmitting a synchronization signal according to an embodiment of the present invention; FIG. 8 is a flowchart of a specific implementation manner of a method for transmitting a synchronization signal according to an embodiment of the present invention; FIG. 9 is a flowchart of another specific implementation manner of a method for transmitting a synchronization signal according to an embodiment of the present invention;

FIG. 10 is a flow chart of another method for transmitting a synchronization signal according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The technical solution provided by the embodiment of the present invention can be applied to a working scenario of partial network coverage. In a scenario covered by a part of the network, some terminal devices are within the network coverage, and another terminal device is outside the network coverage. Synchronizing the terminal devices inside and outside the network coverage by using the synchronization signal transmitted by the first terminal device and the wake-up signal transmitted by the second terminal device. The technical solution provided by the embodiment of the present invention may also be used in a scenario in which a terminal device in a different cell in a network coverage communicates, using a synchronization signal transmitted by the first terminal device and a wake-up signal transmitted by the second terminal device to implement different cells. Synchronization of terminal device communication.

The embodiment of the present invention provides a device 100 for transmitting a synchronization signal, which is used for a first terminal device, and the first terminal device is a terminal device in a network coverage. As shown in FIG. 1, the device 100 includes:

The receiving module 101 is configured to receive, by the first terminal device, a wake-up signal sent by the second terminal device.

The wake-up signal is used to trigger the terminal device to transmit a synchronization signal. The wake-up signal can be either a sync signal or a custom signal. When the first terminal device receives the wake-up signal transmitted by the second terminal device, the first terminal device can learn the existence of the second terminal device, thereby performing a subsequent process.

The transmitting module 102 is configured to send, by the first terminal device, the synchronization signal. Wherein, the synchronization signal can enable the two terminal devices of the communication to obtain a common synchronization Reference, thereby enabling the two terminal devices of the communication to synchronize.

The device for transmitting a synchronization signal is provided by the embodiment of the present invention, the second terminal device is capable of transmitting a wake-up signal, the first terminal device receives the wake-up signal, and transmits the synchronization signal, and the second terminal device receives the synchronization signal transmitted by the first terminal device, And synchronized with the first terminal device. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Accuracy; Moreover, it is also possible to enable the terminal devices in different cells in the network coverage to perform synchronous communication; at the same time, the interference that may occur when the terminal devices are not synchronized is also avoided, and the receiving performance of the terminal device is improved.

Further, as shown in FIG. 2, the receiving module 101 and the transmitting module 102 include: a receiving unit 101 1 , configured to receive, by the first terminal device, the wake-up signal sent by the second terminal device at a predetermined time.

Further, the predetermined time is a preset time set or a time period set, that is, the predetermined time may be a preset time set or a time period set of the communication system, or may be a time known in the D2D communication group. Collection or time period collection. For example, the communication system presets that the duration of receiving the wake-up signal by the first terminal device may be N times of the wake-up signal sent by the second terminal, where N is a positive integer, for example, the N-time period is 1 second, and the preset time period set is {0. , 100 , 1000} , the first terminal device starts from time 0 and continues to receive the wake-up signal for 1 second, and stops receiving the wake-up signal after 1 second; starts from the next time 100 in the preset time period set, and continues for 1 second. Receive wake-up signal, stop receiving wake-up signal after 1 second, and so on.

It should be noted that the wake-up signal transmitted by the second terminal device is a continuous process, and when the first terminal device receives the wake-up signal transmitted by the second terminal device at a predetermined time, the wake-up signal does not occur.

The first transmitting unit 1021 is configured to: when the priority of the synchronization signal to be transmitted of the first terminal device is higher than the synchronization priority of the wake-up signal, the first terminal device Transmitting the synchronization signal to be transmitted.

The wake-up signal includes synchronization priority information. When the priority of the to-be-sent sync signal of the first terminal device is higher than the synchronization priority of the wake-up signal, the first terminal device transmits the synchronization signal to be transmitted.

The first terminal device does not need to transmit the synchronization signal to be transmitted if the priority of the synchronization signal to be transmitted of the first terminal device is lower than the synchronization priority of the wake-up signal.

The device for transmitting a synchronization signal is provided by the embodiment of the present invention. The second terminal device is capable of transmitting a wake-up signal, the first terminal device receives the wake-up signal at a predetermined time, and transmits a synchronization signal, and the second terminal device receives the first terminal device and transmits the synchronization signal. The synchronization signal determines whether to transmit the synchronization signal to be transmitted according to the priority of the synchronization signal to be transmitted and the wake-up signal, and synchronizes with the first terminal device. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Accuracy; and, also, enabling terminal devices in different cells in the network coverage to perform synchronous communication; at the same time, avoiding interference that may occur when the terminal device is out of synchronization, and improving reception performance of the terminal device; The device does not always receive the wake-up signal, but receives the wake-up signal at a given time, and also saves the power consumed by the first terminal device on the received signal. Further, as shown in FIG. 3, the device 100 further includes:

The random number module 103 is configured to generate a random number by the first terminal device.

The random number is used to determine whether the first terminal device transmits a synchronization signal to be transmitted, and the range of the random number can be set by the user. For example: Set the random number to 0 or 1.

The determining module 104 determines whether the random number satisfies a preset condition.

The preset condition can also be set by the user, for example: the random number that may be generated is 0 or 1, and the preset condition is set to 1 for the random number, and when the generated random number is 1, The random number satisfies the preset condition.

The transmitting module 102 includes:

The second transmitting unit 1022 is configured to: when the random number meets the preset condition, the first terminal device transmits the synchronization signal to be transmitted.

For example, the preset condition is that the random number is 1, and when the generated random number is 1, that is, when the random number satisfies the preset condition, the first terminal device transmits the synchronization signal to be transmitted.

Optionally, the wake-up signal carries the group ID information, and the wake-up signal carries the same group ID as the first terminal device. The wake-up signal carrying the group ID information may carry a field dedicated to the group ID information; or, if the wake-up signal is a sequence, the length of the sequence, the sequence number of the sequence, or the position of the sequence may be used to correspond to the group ID. , to carry group ID information. For example, the wake-up signal is a sequence of sequence number N, and the sequence ID of the sequence N is 1 , and the wake-up signal carries a group ID of 1.

The device for transmitting a synchronization signal is provided by the embodiment of the present invention. The second terminal device can transmit the wake-up signal, and the first terminal device receives the wake-up signal, and uses the random number generated by the first terminal device to determine whether to transmit the synchronization signal, and second. The terminal device receives the synchronization signal transmitted by the first terminal device and synchronizes with the first terminal device. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Accuracy; Moreover, it is also possible to enable the terminal devices in different cells in the network coverage to perform synchronous communication; at the same time, the interference that may occur when the terminal devices are not synchronized is also avoided, and the receiving performance of the terminal device is improved.

The embodiment of the present invention provides a device 200 for transmitting a synchronization signal, which is used for a second terminal device, as shown in FIG. 4, and includes:

The transmitting module 201 is configured to send, by the second terminal device, a wake-up signal.

The wake-up signal is used to trigger the terminal device to transmit a synchronization signal.

It should be noted that when the terminal devices are all within the network coverage, they are different. In a different cell of a step, if there is a terminal device that is transmitting a communication signal in a cell, and the terminal device in the neighboring cell of the cell wants to perform D2D communication with the terminal device that is transmitting the communication signal, the terminal device in the neighboring cell It is necessary to synchronize with the terminal device that is transmitting the communication signal at the communication time. Therefore, the terminal device in the neighboring cell needs to acquire the synchronization reference of the cell where the terminal device that is transmitting the communication signal is located, that is, the cell where the terminal device that is transmitting the communication signal is located. The synchronization signal transmitted by the base station, but in this case, there is also a possibility that the terminal equipment in the neighboring cell cannot correctly receive the synchronization signal transmitted by the base station of the different cell. Therefore, the wake-up signal may be transmitted by the terminal device in the neighboring cell, and the terminal device of the cell where the terminal device that is transmitting the communication signal is triggered to transmit the synchronization signal. The second terminal device may be a terminal device in a neighboring cell, and the first terminal device may be a terminal device in a cell where the terminal device that is transmitting the communication signal is located.

Optionally, the second terminal device has no network connection, that is, when the second terminal device is outside the network coverage, the wake-up signal is sent in a broadcast manner, for example, the second terminal device is disconnected from the originally connected network due to an emergency event. At this time, the second terminal device transmits a wake-up signal. For another example: the second terminal device is always in a no-network connection state, and the second terminal device transmits a wake-up signal.

The receiving module 202 is configured to receive a synchronization signal sent by the first terminal device, and synchronize with the first terminal device.

The second terminal device transmits a wake-up signal in a broadcast manner, and a plurality of terminal devices may receive a wake-up signal transmitted by the second terminal device, and the terminal device that receives the wake-up signal may transmit a synchronization signal. When the second terminal device receives more than one synchronization signal, it selects to synchronize with the terminal device with the highest priority.

Optionally, the wakeup signal carries the group ID information, and the group ID carried by the wakeup signal is the same as the group ID of the first terminal device. For example, at time t1, the first terminal device and the second terminal device are in the same network coverage, belong to the same group, and the first terminal device and the second terminal device have the same group ID; at time t2 after the time t1, the second The terminal device leaves the network, carries the group ID information in the wake-up signal transmitted by the second terminal device, and wakes up The group ID carried by the signal is the same as the group ID of the first terminal device.

Optionally, the wake-up signal includes synchronization priority information, and the terminal device with low priority is synchronized to the terminal device with high priority.

The device for transmitting a synchronization signal is provided by the embodiment of the present invention, the second terminal device is capable of transmitting a wake-up signal, the first terminal device receives the wake-up signal, and transmits the synchronization signal, and the second terminal device receives the synchronization signal transmitted by the first terminal device, And synchronized with the first terminal device. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Accuracy; Moreover, it is also possible to enable the terminal devices in different cells in the network coverage to perform synchronous communication; at the same time, the interference that may occur when the terminal devices are not synchronized is also avoided, and the receiving performance of the terminal device is improved. The embodiment of the present invention provides a terminal device 300, as shown in FIG. 5, including: at least one processor 301, such as a CPU, at least one communication bus 302, a memory 303, at least one network interface 304 or a user interface 305, and a transmitting end 306 and receiving end 307. Communication bus 302 is used to implement connection communication between these components. Optionally, the user interface 305 includes a display, a keyboard, a mouse, a touch screen, and the like. Memory 303 may include high speed RAM memory and may also include non-volatile memory, such as at least one disk memory. Transmitter 306 is used to transmit a synchronization signal. The receiving end 307 is configured to receive the wake-up signal transmitted by the second terminal device.

Specifically, the memory 303 can be used to store the wake-up signal transmitted by the second terminal device and the synchronization signal transmitted by the first terminal device.

Further, the memory 303 may be further configured to store the group ID carried by the wake-up signal and the group ID of the first terminal device; and may also store the synchronization priority information included in the wake-up signal and the priority of the synchronization signal to be transmitted of the first terminal device. ; can also store generated Random numbers and preset conditions.

Specifically, the processor 301 can be configured to control the receiving end 307 to receive the wake-up signal sent by the second terminal device, where the wake-up signal is used to trigger the terminal device to transmit the synchronization signal, and to control the transmitting end 306 to transmit the synchronization signal.

Further, the processor 301 is further configured to control the receiving end 307 to receive the wake-up signal sent by the second terminal device at a predetermined time.

Further, the predetermined time is a preset time set or a time period set.

Optionally, the wakeup signal carries the group ID information; the group ID carried by the wakeup signal is the same as the group ID of the first terminal device.

Optionally, the wakeup signal includes the synchronization priority information, and the processor 301 is further configured to: when the priority of the synchronization signal to be transmitted of the first terminal device is higher than the synchronization priority of the wakeup signal, control the transmitting end 306. Transmitting the synchronization signal to be transmitted.

Further, the processor 301 may be further configured to generate a random number; and, configured to determine whether the random number satisfies a preset condition; and, to be used, when the random number satisfies the preset condition, the first The terminal device transmits the synchronization signal to be transmitted.

A terminal device provided by the embodiment of the present invention, the second terminal device is capable of transmitting a wake-up signal, the first terminal device receives the wake-up signal, and transmits a synchronization signal, and the second terminal device receives the synchronization signal transmitted by the first terminal device, and the A terminal device synchronizes. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Accuracy; and, also, enabling terminal devices in different cells in the network coverage to perform synchronous communication; at the same time, avoiding interference that may occur when the terminal device is out of synchronization, and improving reception performance of the terminal device; The device does not always receive the wake-up signal, but receives the wake-up signal at a given time, and also saves the power consumed by the first terminal device on the received signal. The embodiment of the present invention provides a terminal device 400, as shown in FIG. 6, including: at least one processor 401, such as a CPU, at least one communication bus 402, a memory 403, at least one network interface 404 or a user interface 405, and a transmitting end 406 and receiving end 407. Communication bus 402 is used to implement connection communication between these components. Optionally, the user interface 405 includes a display, a keyboard, a mouse, a touch screen, and the like. The memory 403 may include a high speed RAM memory and may also include a non-volatile memory such as at least one disk memory. Transmitter 406 is used to transmit a wake-up signal. The receiving end 407 is configured to receive a synchronization signal transmitted by the first terminal device.

Specifically, the memory 403 can be used to store the wake-up signal and the received synchronization signal; and can also be used to store the group ID information carried by the wake-up signal; and can also be used to store the synchronization priority information included in the wake-up signal.

Specifically, the processor 401 may be configured to: the second terminal device controls the transmitting end 406 to send a wake-up signal, where the wake-up signal is used to trigger the terminal device to transmit the synchronization signal; and, to control the receiving end 407 to receive the first terminal. A synchronization signal transmitted by the device and synchronized with the first terminal device.

Optionally, the second terminal device has no network connection.

Optionally, the wake-up signal carries the group ID information, and the wake-up signal carries the same group ID as the first terminal device.

Optionally, the wake-up signal includes synchronization priority information.

A terminal device provided by the embodiment of the present invention, the second terminal device is capable of transmitting a wake-up signal, the first terminal device receives the wake-up signal, and transmits a synchronization signal, and the second terminal device receives the synchronization signal transmitted by the first terminal device, and the A terminal device synchronizes. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Accuracy; and, also, enables terminals in different cells within the network coverage The device performs synchronous communication. At the same time, the interference that occurs when the terminal device is out of synchronization is avoided, and the receiving performance of the terminal device is improved. Moreover, the first terminal device is not always in the state of receiving the wake-up signal, but at a predetermined time. Receiving the wake-up signal also saves the power consumed by the first terminal device on the received signal. The embodiment of the invention provides a method for transmitting a synchronization signal, which is used for a first terminal device, and the first terminal device is a terminal device in a network coverage. As shown in FIG. 7, the method includes:

501. The first terminal device receives a wake-up signal sent by the second terminal device. The wake-up signal is used to trigger the terminal device to transmit a synchronization signal. The wake-up signal can be either a sync signal or a custom signal. When the first terminal device receives the wake-up signal transmitted by the second terminal device, the first terminal device can learn the existence of the second terminal device, thereby performing a subsequent process.

502. The first terminal device transmits a synchronization signal.

Wherein, the synchronization signal can cause the two terminal devices of the communication to obtain a common synchronization reference, so that the two terminal devices of the communication synchronize.

A method for transmitting a synchronization signal is provided by the embodiment of the present invention, the second terminal device is capable of transmitting a wake-up signal, the first terminal device receives the wake-up signal, and transmits the synchronization signal, and the second terminal device receives the synchronization signal transmitted by the first terminal device, And synchronized with the first terminal device. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Accuracy; Moreover, it is also possible to enable the terminal devices in different cells in the network coverage to perform synchronous communication; at the same time, the interference that may occur when the terminal devices are not synchronized is also avoided, and the receiving performance of the terminal device is improved. Further, on the basis of the solution shown in FIG. 7, the embodiment of the present invention further provides a specific solution of the information transmission method, where the wake-up signal includes a synchronization priority. For the information, the execution process of 501 and 502 shown in FIG. 7 is further refined. 501 can be implemented as 501 1 , and 502 can be implemented as 5021 . As shown in FIG. 8 , the method includes:

501: The first terminal device receives the wake-up signal sent by the second terminal device at a predetermined time.

Further, the predetermined time is a preset time set or a time period set, that is, the predetermined time may be a preset time set or a time period set of the communication system, or may be a time known in the D2D communication group. Collection or time period collection. For example, the communication system presets that the duration of receiving the wake-up signal by the first terminal device may be N times of the wake-up signal sent by the second terminal, where N is a positive integer, for example, the N-time period is 1 second, and the preset time period set is {0. , 100 , 1000 } , the first terminal device starts from time 0 and continues to receive the wake-up signal for 1 second, and stops receiving the wake-up signal after 1 second; starts from the next time 100 in the preset time period set, and continues for 1 second. Receive wake-up signal, stop receiving wake-up signal after 1 second, and so on.

The first terminal device transmits the synchronization signal to be transmitted when the priority of the synchronization signal to be transmitted of the first terminal device is higher than the synchronization priority of the wake-up signal.

The wake-up signal includes synchronization priority information. When the priority of the to-be-transmitted synchronization signal of the first terminal device is higher than the synchronization priority of the wake-up signal, the first terminal device transmits the synchronization signal to be transmitted.

A method for transmitting a synchronization signal is provided by the embodiment of the present invention. The second terminal device can transmit a wake-up signal, the first terminal device receives the wake-up signal at a predetermined time, and transmits a synchronization signal, and the second terminal device receives the first terminal device and transmits the synchronization signal. The synchronization signal determines whether to transmit the synchronization to be transmitted according to the priority of the synchronization signal to be transmitted and the wake-up signal Signal and synchronize with the first terminal device. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Accuracy; and, also, enabling terminal devices in different cells in the network coverage to perform synchronous communication; at the same time, avoiding interference that may occur when the terminal device is out of synchronization, and improving reception performance of the terminal device; The device does not always receive the wake-up signal, but receives the wake-up signal at a given time, and also saves the power consumed by the first terminal device on the received signal. In addition, on the basis of the solution shown in FIG. 8, the embodiment of the present invention further provides a specific method for transmitting a synchronization signal, which can add 503 and 504, and further refine the execution process of 502, and further Can be specifically refined to 5022, as shown in Figure 9, including:

503. The first terminal device generates a random number.

504. Determine whether the random number meets a preset condition.

The preset condition can also be set by the user. For example, the random number that may be generated is 0 or 1. The preset condition is set to 1 for the random number. When the generated random number is 1, the random number satisfies the preset. condition.

5022. When the random number satisfies the preset condition, the first terminal device transmits the synchronization signal to be transmitted.

For example, in the example of 504, when the generated random number is 1, that is, when the random number satisfies the preset condition, the first terminal device transmits the synchronization signal to be transmitted.

Optionally, the wakeup signal may carry the group ID information, and the wakeup signal carries the same group ID as the first terminal device. Wherein, the wake-up signal carrying the group ID information may be To carry a field dedicated to the group ID information; or, if the wake-up signal is a sequence, the group ID information may be carried by using the correspondence between the length of the sequence, the sequence number of the sequence, or the position of the sequence and the group ID. For example, the wake-up signal is a sequence of sequence number N, and the group ID corresponding to the sequence number N of the sequence is 1, and the group ID carried by the wake-up signal is 1.

A method for transmitting a synchronization signal is provided by an embodiment of the present invention. The second terminal device can transmit a wake-up signal, and the first terminal device receives the wake-up signal, and uses the random number generated by the first terminal device to determine whether to transmit the synchronization signal, and second. The terminal device receives the synchronization signal transmitted by the first terminal device and synchronizes with the first terminal device. Compared with the prior art, the solution utilizes a wake-up signal and a synchronization signal between the first terminal device and the second terminal device, so that the second terminal device can synchronize with the first terminal device, even in a working scenario of partial network coverage. Users inside and outside the network coverage can also use the synchronization reference of the network to communicate, which reduces the difficulty of the connection between users inside and outside the network coverage, and reduces the interference of the network coverage boundary, and enhances the synchronization. Accuracy; Moreover, it is also possible to enable the terminal devices in different cells in the network coverage to perform synchronous communication; at the same time, the interference that may occur when the terminal devices are not synchronized is also avoided, and the receiving performance of the terminal device is improved. An embodiment of the present invention provides a method for transmitting a synchronization signal, which is used in a second terminal device, as shown in FIG. 10, and includes:

601. The second terminal device sends a wake-up signal.

It should be noted that when the terminal devices are all in the network coverage but are in different non-synchronized cells, if there is a terminal device that is transmitting a communication signal in one cell, the terminal device in the neighboring cell of the cell wants to be The terminal device transmitting the communication signal performs D2D communication, and the terminal device in the neighboring cell needs to synchronize with the terminal device that is transmitting the communication signal at the communication time. Therefore, the terminal device in the neighboring cell needs to acquire the terminal device where the communication signal is being transmitted. The synchronization reference of the cell, that is, the synchronization signal transmitted by the base station of the cell where the terminal device that is transmitting the communication signal is located, but in this case, the terminal device in the neighboring cell cannot correctly receive the base of the different cell. The possibility of a synchronization signal transmitted by the station. Therefore, the wake-up signal may be transmitted by the terminal device in the neighboring cell, and the terminal device of the cell where the terminal device that is transmitting the communication signal is triggered to transmit the synchronization signal. The second terminal device may be a terminal device in a neighboring cell, and the first terminal device may be a terminal device in a cell where the terminal device that is transmitting the communication signal is located.

602. Receive a synchronization signal sent by the first terminal device, and synchronize with the first terminal device.

Optionally, the wakeup signal may carry the group ID information, and the wakeup signal carries the same group ID as the first terminal device. For example, at time t1, the first terminal device and the second terminal device are in the same network coverage, belong to the same group, and the first terminal device and the second terminal device have the same group ID; at time t2 after the time t1, the second The terminal device is out of the network, and the group ID information is carried in the wake-up signal transmitted by the second terminal device, and the group ID carried by the wake-up signal is the same as the group ID of the first terminal device.

A method for transmitting a synchronization signal is provided by the embodiment of the present invention, the second terminal device is capable of transmitting a wake-up signal, the first terminal device receives the wake-up signal, and transmits the synchronization signal, and the second terminal device receives the synchronization signal transmitted by the first terminal device, And synchronized with the first terminal device. Compared with the prior art, the solution is in the first terminal device and the second terminal. The wake-up signal and the synchronization signal are used between the devices, so that the second terminal device can synchronize with the first terminal device. Even in a working scenario of partial network coverage, users in and out of the network coverage can use the synchronization reference of the network. Communication, which reduces the difficulty of the connection between users inside and outside the network coverage, reduces the interference of the network coverage boundary, enhances the accuracy of synchronization, and enables terminal devices in different cells within the network coverage. Synchronous communication is performed; at the same time, interference that occurs when the terminal device is out of synchronization is also avoided, and the receiving performance of the terminal device is improved. The various embodiments in the present specification are described in a progressive manner, and the same or similar parts between the various embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope of the present invention is All should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

claims

1. A device for transmitting synchronization signals, characterized in that it is used for a first terminal device, and the first terminal device is a terminal device within network coverage. The device includes:

A receiving module, configured for the first terminal device to receive a wake-up signal transmitted by the second terminal device, where the wake-up signal is used to trigger the terminal device to transmit a synchronization signal;

A transmitting module, configured for the first terminal device to transmit the synchronization signal.

2. The device according to claim 1, characterized in that the receiving module includes:

A receiving unit, configured for the first terminal device to receive the wake-up signal transmitted by the second terminal device at a predetermined time.

3. The device according to claim 2, characterized in that the predetermined time is a preset time set or a time period set.

4. The device according to any one of claims 1 to 3, wherein the wake-up signal carries group ID information; the group ID carried by the wake-up signal is the same as the group ID of the first terminal device.

5. The device according to any one of claims 1 to 3, characterized in that the wake-up signal includes synchronization priority information; the transmitting module includes:

The first transmitting unit is configured to transmit the synchronization signal to be transmitted by the first terminal device when the priority of the synchronization signal to be transmitted by the first terminal device is higher than the synchronization priority of the wake-up signal.

6. The device according to any one of claims 1 to 5, characterized in that the device further includes:

A random number module, used for the first terminal device to generate random numbers;

A judgment module to judge whether the random number meets the preset conditions;

The transmitting module includes:

The second transmitting unit is configured to transmit the synchronization signal to be transmitted to the first terminal device when the random number meets the preset condition.

7. A device for transmitting synchronization signals, characterized in that it is used for second terminal equipment, and the device includes: A transmitting module, configured for the second terminal device to transmit a wake-up signal, and the wake-up signal is used to trigger the terminal device to transmit a synchronization signal;

A receiving module, configured to receive the synchronization signal transmitted by the first terminal device and synchronize with the first terminal device.

8. The device according to claim 7, characterized in that the second terminal device has no network connection.

9. The device according to claim 7 or 8, wherein the wake-up signal carries group ID information; the group ID carried by the wake-up signal is the same as the group ID of the first terminal device.

10. The device according to claim 7 or 8, characterized in that the wake-up signal includes synchronization priority information.

1 1. A method of transmitting synchronization signals, characterized in that it is used for a first terminal device, and the first terminal device is a terminal device within network coverage. The method includes:

The first terminal device receives a wake-up signal transmitted by the second terminal device, and the wake-up signal is used to trigger the terminal device to transmit a synchronization signal;

The first terminal device transmits the synchronization signal.

12. The method according to claim 11, characterized in that the first terminal device receives the wake-up signal transmitted by the second terminal device, including:

13. The method according to claim 12, characterized in that the predetermined time is a preset time set or a time period set.

14. The method according to any one of claims 11 to 13, characterized in that the wake-up signal carries group ID information; the group ID carried by the wake-up signal is the same as the group ID of the first terminal device.

15. The method according to any one of claims 11 to 13, characterized in that the wake-up signal includes synchronization priority information; the first terminal device transmits a synchronization signal, including: When the priority of the synchronization signal to be transmitted by the first terminal device is higher than the synchronization priority of the wake-up signal, the first terminal device transmits the synchronization signal to be transmitted.

16. The method according to any one of claims 11 to 15, characterized in that, before the first terminal device transmits the synchronization signal to be transmitted, it includes:

The first terminal device generates random numbers;

Determine whether the random number meets the preset conditions;

The first terminal device transmits the synchronization signal to be transmitted, including:

When the random number meets the preset condition, the first terminal device transmits the synchronization signal to be transmitted.

17. A method of transmitting a synchronization signal, characterized in that it is used for a second terminal device, and the method includes:

The second terminal device transmits a wake-up signal, and the wake-up signal is used to trigger the terminal device to transmit a synchronization signal;

Receive the synchronization signal transmitted by the first terminal device, and synchronize with the first terminal device.

18. The method according to claim 17, characterized in that the second terminal device has no network connection.

19. The method according to claim 17 or 18, characterized in that the wake-up signal carries group ID information, and the group ID carried by the wake-up signal is the same as the group ID of the first terminal device.

20. The method according to claim 17 or 18, characterized in that the wake-up signal includes synchronization priority information.