CROSS-REFERENCE TO RELATED APPLICATION

The present application is a 35 U.S.C. 371 national stage filing of PCT Application No. PCT/CN2018/088277 filed on May 24, 2018, which claims priority to Chinese patent application No. CN201710686097.X filed on Aug. 11, 2017, the disclosure of which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present disclosure relates to the field of communications, and in particular, to a signal detection method and apparatus, a signal sending method and apparatus, a remote user equipment, and a storage medium.

BACKGROUND

In a device-to-device (D2D) communication, traffic data is transmitted directly from a source user equipment to a target user equipment through an air interface without being forwarded by a base station and a core network.FIG. 1is a schematic diagram of a architecture of a communication mode of the D2D communication in the related art, as shown inFIG. 1, this communication mode may also be referred to as a proximity service (ProSe). For a user to perform short-distance communication, the radio spectrum resource is saved and the data transmission pressure of the core network is reduced through the D2D communication.

In the D2D communication, a receiving end user equipment (UE) needs to be in timing synchronization with a sending end user equipment so as to ensure that the receiving end UE may correctly parse data sent by the sending end UE.

In the related D2D technology, a UE obtains a synchronization timing reference by detecting a sidelink synchronisation signal (SLSS), thereby achieving a timing synchronization with neighboring UEs.

In the D2D technology, UEs participating in the D2D communication include a relay UE and a remote UE. The remote UE may be within a network coverage, or may be out of the network coverage and communicate with a cellular network through relay of the Relay UE.FIG. 2is a schematic diagram of a architecture of the D2D technology in the related art, as shown inFIG. 2. Among them, the remote UEs include an internet of things (IoT) device and a wearable device. For these devices, low power consumption is a key requirement needs to be considered.

According to a technical solution in the related art, when the remote UE out of the coverage has communication requirements, if no SLSS is detected, the remote UE sends a SLSS based on its own timing so that other D2D UEs obtain a timing for receiving data sent by the remote UE. The SLSS is periodically sent and the processing of detecting the SLSS is still carried out at the same time, until the SLSS sent by a high-priority synchronization reference source is detected. Then, the remote UE is synchronization with the synchronization reference source.

In the above-mentioned synchronization process, for the remote UE, the continuous detection of the SLSS is apparently not conducive to saving the power consumption of the device, so there is a problem of high power consumption.

SUMMARY

Embodiments of the present disclosure provide a signal detection method and apparatus, a signal sending method and apparatus, and a remote user equipment.

According to an embodiment of the present disclosure, provided is a signal detection method applied to a first user equipment. In the method, a first synchronization signal is sent based on a first timing reference; a first discovery signal is detected based on the first timing reference; where the first discovery signal carries synchronization information; and after the first discovery signal is detected, a second synchronization signal is detected within a first time window corresponding to the synchronization information.

According to an embodiment of the present disclosure, provided is a signal sending method applied to a second user equipment. In the method, a first synchronization signal is detected; a first discovery signal is sent based on a first timing reference, where the first timing reference is a timing reference obtained by detecting the first synchronization signal; the first discovery signal carries synchronization information, where the synchronization information is used by a first user equipment to determine a first time window used for detecting a second synchronization signal; and the second synchronization signal is sent based on a second timing reference.

According to an embodiment of the present disclosure, provided is a signal detection apparatus located in a first user equipment. The signal detection apparatus includes a first sending module, a first detection module and a second detection module. The first sending module is configured to send a first synchronization signal based on a first timing reference. The first detection module is configured to detect a first discovery signal based on the first timing reference, where the first discovery signal carries synchronization information. The second detection module is configured to detect a second synchronization signal within a first time window corresponding to the synchronization information after the first discovery signal is detected.

According to an embodiment of the present disclosure, provided is a signal sending apparatus, including a detection module, a first sending module and a second sending module. The detection module is configured to detect a first synchronization signal. The first sending module is configured to send a first discovery signal based on a first timing reference, where the first timing reference is a timing reference obtained by detecting the first synchronization signal, the first discovery signal carries synchronization information, the synchronization information is used by a first user equipment to determine a first time window used for detecting a second synchronization signal. The second sending module is configured to send the second synchronization signal based on a second timing reference.

According to an embodiment of the present disclosure, provided is a remote user equipment including a processor. The processor is configured to execute a program. The program is executed to perform the method of any one of the above.

According to an embodiment of the present disclosure, provided is a relay user equipment including a processor. The processor is configured to execute a program. The program is executed to perform the method of any one of the above.

According to an embodiment of the present disclosure, provided is a storage medium storing a program. The program is executed to perform the method of any one of the above.

According to an embodiment of the present disclosure, provided is a processor. The processor is configured to execute a program. The program is executed to perform the method of any one of the above.

According the embodiments of the present disclosure, after the first discovery signal is detected, the second synchronization signal may be detected within the first time window corresponding to the synchronization information carried by the first discovery signal, that is, instead of being continuously monitored all the time, the second synchronization signal may be detected only within the first time window, such that the time, the times and the like for detecting the synchronization signal by the device may be reduced, and thus the power consumption generated by detecting the synchronization signal by the device may be reduced. Therefore, the problem in the related art that the power consumption of the remote user equipment is large because that the remote user equipment continuously detects the synchronous signal may be solved, the effect of reducing the power consumption of the device is achieved, the standby time of the device may be prolonged for the mobile device, which is beneficial to achieve the ultra-long standby.

