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US 2017/0289935 A1Published application
Method and apparatus for synchronization for vehicle-to-x communication
AssigneeInnovative Technology Lab Co., Ltd.
InventorSung Jun YOON
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Abstract
Provided is a synchronization method and apparatus in a wireless communication system. A synchronization method according to an aspect of the present disclosure may include: receiving a first synchronization signal and a second synchronization signal; determining a priority order of the first synchronization signal and the second synchronization signal; and performing synchronization based on a synchronization signal having a higher priority between the first synchronization signal and the second synchronization signal.
Claims18
A method of generating a synchronization signal, the method comprising:
- synchronizing, by a first device, a timing of a synchronization signal received from a synchronization source, the timing of the synchronization signal being associated with a synchronization timing of a Global Navigational Satellite System (GNSS);
- determining a subframe to transmit a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS);
- mapping the SSSS to two consecutive single frequency-frequency division multiple access (SC-FDMA) symbols in the determined subframe;
- and
- transmitting, from the first device to a second device, the PSSS and the SSSS in the determined subframe,
- wherein the mapping the SSSS comprises:
- generating a first length-31 sequence based on m1;
- generating a second length-31 sequence based on m0, where m1 is greater than m0;
- and
- mapping the first length-31 sequence and the second length-31 sequence to 62 consecutive subcarriers in the two consecutive SC-FDMA symbols in the determined subframe, wherein a portion of the first length-31 sequence is mapped to a subcarrier having a lowest index among the 62 consecutive subcarriers and a portion of the second length-31 sequence is mapped to a subcarrier having a highest index among the 62 consecutive subcarriers.
7 more elements
A method of generating a synchronization signal, the method comprising:
- determining, by a first device, at least one of synchronization signals transmitted from a plurality of synchronization sources, wherein the plurality of synchronization sources comprise an evolved NodeB (eNB), a Global Navigational Satellite System (GNSS), and a device capable of synchronizing with a GNSS;
- synchronizing, by the first device, a timing of a synchronization signal selected from the determined synchronization signals, the timing of the selected synchronization signal being associated with a synchronization timing of the GNSS;
- determining a subframe to transmit a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS);
- mapping the PSSS to first two consecutive single carrier-frequency division multiple access (SC-FDMA) symbols in the determined subframe;
- mapping the SSSS to second two consecutive SC-FDMA symbols in the determined subframe;
- and
- transmitting, from the first device to a second device, the PSSS and SSSS mapped in the determined subframe,
- wherein the mapping the SSSS comprises:
- determining two integers m0 and m1, where m1 is greater than m0;
- generating a first length-31 sequence based on mi;
- generating a second length-31 sequence based on m0;
- and
- mapping the first length-31 sequence and the second length-31 sequence to 62 consecutive subcarriers in the second two consecutive SC-FDMA symbols in the determined subframe, wherein a portion of the first length-31 sequence is mapped to a subcarrier having the lowest index among the 62 consecutive subcarriers and a portion of the second length-31 sequence is mapped to a subcarrier having the highest index among the 62 consecutive subcarriers.
10 more elements
A method of selecting a synchronization signal, the method comprising:
- determining, by a first device, at least one of synchronization signals transmitted from a plurality of synchronization sources, wherein the plurality of synchronization sources comprise an evolved NodeB (eNB), a Global Navigational Satellite System (GNSS), and a device capable of synchronizing with a GNSS;
- and
- synchronizing, by the first device, a timing of a synchronization signal selected from the determined synchronization signals, the timing of the selected synchronization signal being associated with a synchronization timing of the GNSS,
- wherein the synchronizing the timing of the synchronization signal comprises:
- determining a subframe to which a primary sidelink synchronization signal (PSSS) of the synchronization signal is mapped;
- and
- determining a secondary sidelink synchronization signal (SSSS) of the synchronization signal from 62 consecutive subcarriers of two consecutive single frequency-frequency division multiple access (SC-FDMA) symbols in the determined subframe,
- wherein the SSSS comprises a first length-31 sequence generated based on m1 and a second length-31 sequence generated based on m0, where m1 is greater than m0, and
- wherein a portion of the first length-31 sequence is mapped to a subcarrier having a lowest index among the 62 consecutive subcarriers and a portion of the second length-31 sequence is mapped to a subcarrier having a highest index among the 62 consecutive subcarriers.
6 more elements
Dependencies are inferred from the claim text.