Synchronous communication method and terminal
First Claim
1. A synchronous communication method, comprising:
- obtaining, by a first terminal, first configuration information, wherein the first configuration information comprises an offset;
determining, by the first terminal according to a global navigation satellite system (GNSS) clock, a current moment;
calculating, by the first terminal, a frame number in a device-to-device (D2D) communications system and a subframe number in the D2D communications system corresponding to the current moment;
determining, by the first terminal, whether the frame number and the subframe number satisfy a formula of;
(c*DFNi+subframei)mod K3=syncOffsetIndicator, wherein subframei is the subframe number, DFNi is the frame number, c is the quantity of subframes included in one frame, K3 is a synchronization sending period, and syncOffsetIndicator is the offset; and
if the frame number and the subframe number satisfy the formula, sending, by the first terminal, sidelink synchronization information in a subframe corresponding to the frame number and the subframe number, wherein the sidelink synchronization information carries indication information that the first terminal is a synchronization source that uses the GNSS clock.
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Accused Products
Abstract
A synchronous communication method is provided. The method includes: obtaining, by a first terminal, first configuration information, where the first configuration information includes a first parameter; determining, by the first terminal according to a global navigation satellite system (GNSS) clock, a transmission timeslot corresponding to a current moment in a device-to-device (D2D) communications system; determining, by the first terminal according to the transmission timeslot and the first parameter, whether the current moment is a synchronization-information-sending moment; if the current moment is the synchronization-information-sending moment, sending, by the first terminal, sidelink synchronization information at the synchronization-information-sending moment, where the sidelink synchronization information carries indication information, the sidelink synchronization information is used to synchronize a second terminal with the first terminal, and the indication information is used to indicate, to the second terminal, that the first terminal is a synchronization source that uses the GNSS clock.
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Citations
19 Claims
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1. A synchronous communication method, comprising:
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obtaining, by a first terminal, first configuration information, wherein the first configuration information comprises an offset; determining, by the first terminal according to a global navigation satellite system (GNSS) clock, a current moment; calculating, by the first terminal, a frame number in a device-to-device (D2D) communications system and a subframe number in the D2D communications system corresponding to the current moment; determining, by the first terminal, whether the frame number and the subframe number satisfy a formula of; (c*DFNi+subframei)mod K3=syncOffsetIndicator, wherein subframei is the subframe number, DFNi is the frame number, c is the quantity of subframes included in one frame, K3 is a synchronization sending period, and syncOffsetIndicator is the offset; and if the frame number and the subframe number satisfy the formula, sending, by the first terminal, sidelink synchronization information in a subframe corresponding to the frame number and the subframe number, wherein the sidelink synchronization information carries indication information that the first terminal is a synchronization source that uses the GNSS clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A first terminal, comprising:
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at least one processor; a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, the programming instructions instruct the at least one processor to; obtain first configuration information, wherein the first configuration information comprises an offset; determine, according to a global navigation satellite system (GNSS) clock, a current moment; calculating a frame number in a device-to-device (D2D) communications system and a subframe number in the D2D communications system corresponding to the current moment; determine whether the frame number and the subframe number satisfy a formula of; (c*DFNi+subframei)mod K3=syncOffsetIndicator, wherein subframei is the subframe number, DFNi is the frame number, c is the quantity of subframes included in one frame, K3 is a synchronization sending period, and syncOffsetIndicator is the offset; and if the frame number and the subframe number satisfy the formula, send sidelink synchronization information in a subframe corresponding to the frame number and the subframe number, wherein the sidelink synchronization information carries indication information indicating that the first terminal is a synchronization source that uses the GNSS clock. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification