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US 11,606,766 B2Granted
Synchronous communication method and terminal
AssigneeHuawei Technologies Co., Ltd.
InventorsMingchao Li, Jiezuo Zhu, Jun Zhang, Guanglin Han
Life of this patent
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Abstract
One example method includes obtaining first configuration information, where the first configuration information includes an initial reference time or a scale parameter, determining a current time according to a global navigation satellite system (GNSS) clock, and calculating a transmission timeslot in a device-to-device (D2D) communications system according to the current time and the first configuration information.
Claims20
A method, comprising:
- obtaining first configuration information comprising an offset;
- determining a current time according to a global navigation satellite system (GNSS) clock;
- determining a transmission timeslot in a device-to-device (D2D) communications system according to the current time and an initial reference time, wherein the transmission timeslot includes at least one of a frame number or a subframe number in the D2D communications system;
- wherein the frame number DFNt satisfies
- DFNt=(α×(Tcurrent−Tref))modK1, wherein
- K1 is a length of a frame period, Tcurrent is the current time, Tref is the initial reference time, and α is a scale parameter;
- wherein the subframe number subframet satisfies
- subframet=(b×(Tcurrent−Tref))mod K2, wherein
- K2 is a length of a subframe period, and b is a second scale parameter;
- determining, according to the transmission timeslot and the offset, a synchronization-information-sending time;
- and
- sending sidelink synchronization information at the synchronization-information-sending time.
9 more elements
A method, comprising:
- obtaining sidelink synchronization information from a first terminal at a synchronization-information-sending time;
- determining, according to indication information included in the sidelink synchronization information, that a synchronization source of the first terminal is a global navigation satellite system (GNSS) clock;
- and
- synchronizing with the first terminal according to the sidelink synchronization information;
- wherein the synchronization-information-sending time is determined according to a transmission timeslot in a device-to-device (D2D) communications system and an offset by the first terminal;
- wherein the transmission timeslot includes at least one of a frame number or a subframe number in the D2D communications system;
- and
- wherein the frame number DFNt satisfies
- DFNt=(α×(Tcurrent−Tref))modK1, wherein
- K1 is a length of a frame period, Tcurrent is the current time, Tref is the initial reference time, and α is a scale parameter;
- wherein the subframe number subframet satisfies
- subframet=(b×(Tcurrent−Tref))mod K2, wherein
- K2 is a length of a subframe period, and b is a second scale parameter.
10 more elements
An apparatus, comprising:
- 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, wherein the programming instructions instruct the at least one processor to:
- obtain first configuration information comprising an offset;
- determine a current time according to a global navigation satellite system (GNSS) clock;
- determine a transmission timeslot in a device-to-device (D2D) communications system according to the current time and an initial reference time, wherein the transmission timeslot includes at least one of a frame number or a subframe number in the D2D communications system;
- wherein the frame number DFNt satisfies
- DFNt=(α×(Tcurrent−Tref))modK1, wherein
- K1 is a length of a frame period, Tcurrent is the current time, Tref is the initial reference time, and α is a scale parameter;
- wherein the subframe number subframet satisfies
- subframet=(b×(Tcurrent−Tref))mod K2, wherein
- K2 is a length of a subframe period, and b is a second scale parameter;
- determine, according to the transmission timeslot in the D2D communications system and the first configuration information, a synchronization-information-sending time;
- and
- send sidelink synchronization information at the synchronization-information-sending time.
11 more elements
An apparatus, comprising:
- 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, wherein the programming instructions instruct the at least one processor to:
- obtain sidelink synchronization information from a first terminal at a synchronization-information-sending time;
- determine, according to indication information included in the sidelink synchronization information, that a synchronization source of the first terminal is a global navigation satellite system (GNSS) clock;
- and
- synchronize with the first terminal according to the sidelink synchronization information;
- wherein the synchronization-information-sending time is determined according to a transmission timeslot in a device-to-device (D2D) communications system and an offset by the first terminal;
- wherein the transmission timeslot includes at least one of a frame number or a subframe number in the D2D communications system;
- and
- wherein the frame number DFNt satisfies
- DFNt=(α×(Tcurrent−Tref))modK1, wherein
- K1 is a length of a frame period, Tcurrent is the current time, Tref is the initial reference time, and α is a scale parameter;
- wherein the subframe number subframet satisfies
- subframet=(b×(Tcurrent−Tref))mod K2, wherein
- K2 is a length of a subframe period, and b is a second scale parameter.
12 more elements
Dependencies are inferred from the claim text.