Synchronization method, apparatus, and system
AssigneeHuawei Technologies Co., Ltd.
InventorJian Wang
Life of this patent
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Abstract
A synchronization method, an apparatus, and a system, which relate to the communications field and applied to synchronization signal transmission to implement synchronization of data frame transmission between devices on an unlicensed carrier are provided. The synchronization method is applied to synchronization on an unlicensed carrier. A network device sets a synchronization signal in a first subframe, and the network device sends the first subframe or the first subframe and a second subframe to user equipment, where the first subframe includes M orthogonal frequency division multiplexing (OFDM) symbols, the second subframe includes N OFDM symbols, M and N are positive integers, M>N, and the first subframe and the second subframe are subframes of an unlicensed carrier.
Claims20
A synchronization method, implemented by a network device comprising a computer processor and an interface circuit, wherein the synchronization method comprises:
- setting, by the computer processor of the network device, a synchronization signal in a first subframe of a data frame of an unlicensed carrier, wherein the synchronization signal comprises a coarse synchronization signal and a fine synchronization signal, wherein a location of the coarse synchronization signal is based on a quantity of cell-specific reference signal (CRS) ports used on the unlicensed carrier, wherein a location of the fine synchronization signal is based on a length of a cyclic prefix (CP) in data on the unlicensed carrier, wherein the first subframe of the data frame of the unlicensed carrier comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols, wherein the coarse synchronization signal is comprised in one of the OFDM symbols, and wherein the fine synchronization signal is comprised in two of the OFDM symbols;
- and
- sending, by the interface circuit of the network device, the first subframe and a second subframe of the data frame to user equipment, wherein the first subframe comprises more OFDM symbols than the second subframe, and wherein the first subframe and the second subframe are subframes of the unlicensed carrier.
A network device, comprising:
- a bus;
- a processor coupled to the bus and configured to set a synchronization signal in a first subframe of a data frame of an unlicensed carrier, wherein the synchronization signal comprises a coarse synchronization signal and a fine synchronization signal, wherein a location of the coarse synchronization signal is based on a quantity of cell-specific reference signal (CRS) ports used on the unlicensed carrier, wherein a location of the fine synchronization signal is based on a length of a cyclic prefix (CP) in data on the unlicensed carrier, wherein the first subframe of the data frame of the unlicensed carrier comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols, wherein the coarse synchronization signal is comprised in one of the OFDM symbols, and wherein the fine synchronization signal is comprised in two of the OFDM symbols;
- and
- an interface circuit coupled to the bus, wherein the interface circuit is configured to send the first subframe and a second subframe of the data frame to user equipment, wherein the first subframe comprises more OFDM symbols than the second subframe, and wherein the first subframe and the second subframe are subframes of the unlicensed carrier.
User equipment, comprising:
- a bus;
- an interface circuit coupled to the bus and configured to receive a first subframe of a data frame and a second subframe of the data frame from a network device, wherein the first subframe comprises more orthogonal frequency division multiplexing (OFDM) symbols than the second subframe, and wherein the first subframe and the second subframe are subframes of an unlicensed carrier;
- and
- a processor coupled to the interface circuit through the bus and configured to:
- determine a location range of an OFDM symbol that is included in the first subframe and that carries a synchronization signal, wherein the synchronization signal comprises a coarse synchronization signal and a fine synchronization signal, wherein a location of the coarse synchronization signal is based on a quantity of cell-specific reference signal (CRS) ports used on the unlicensed carrier, wherein a location of the fine synchronization signal is based on a length of a cyclic prefix (CP) in data on the unlicensed carrier, wherein the first subframe of the data frame of the unlicensed carrier comprises a plurality of OFDM symbols, wherein the coarse synchronization signal is comprised in one of the OFDM symbols, and wherein the fine synchronization signal is comprised in two of the OFDM symbols;
- obtain the synchronization signal according to the location range of the OFDM symbol;
- and
- perform synchronization according to the synchronization signal.
Dependencies are inferred from the claim text.