Method for transmitting or receiving signal using long sequence and apparatus therefor
The present document relates to a method for transmitting a signal using a long sequence in a wireless communication system. According to the method, a transmission side device transmits a signal using the long sequence comprising a combination of a plurality of sub-subsequences, wherein each of the plurality of sub-subsequences comprises a combination of a plurality of short base sequences, each having a length equal to or shorter than a predetermined length, and sequences obtained by multiplying each of the base sequences by a cover sequence.
1. A method for transmitting a narrowband (NB) synchronization signal to at least one user equipment (UE) by an evolved node B (eNB) in a wireless communication system, the method comprising:
repeating a first Zadoff-Chu sequence on a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the first Zadoff-Chu sequence having only one predefined root index;
transmitting the repeated Zadoff-Chu sequence as an NB primary synchronization signal (NB PSS) of the NB synchronization signal;
wherein the NB PSS is transmitted in a state in which the first Zadoff-Chu sequence is multiplied in each of the plurality of OFDM symbols by each element of a cover sequence having a length corresponding to the number of the plurality of OFDM symbols; and
transmitting a second Zadoff-Chu sequence as an NB secondary synchronization signal (NB SSS) of the NB synchronization signal for identifying an NB cell identifier,
wherein the NB SSS is transmitted in a state in which the second Zadoff-Chu sequence is multiplied by each element of a scrambling sequence having a length corresponding to a length of the second Zadoff-Chu sequence, and
wherein a multiplication between the first Zadoff-Chu sequence and the cover sequence is in a unit of OFDM symbol while a multiplication between the second Zadoff-Chu sequence and the scrambling sequence is in a unit of an element of each sequence.
2. The method of claim 1 , wherein the NB synchronization signal is a synchronization signal transmitted for performing Internet of Things (IoT) communication operation through a narrow band corresponding to partial system bandwidth of the wireless communication system.
3. The method of claim 1 , wherein the plurality of OFDM symbols are consecutively arranged in a time domain.
4. The method of claim 1 , wherein the number of the plurality of OFDM symbols is equal to a difference between the number of OFDM symbols included in one subframe and the number of OFDM symbols available for transmission of a physical downlink control channel (PDCCH).
5. The method of claim 1 , wherein subcarrier spacing in a resource region where the NB synchronization signal is transmitted is 15 kHz.
6. A method for receiving a narrowband (NB) synchronization signal from an evolved node B (eNB) by a user equipment (UE) in a wireless communication system, the method comprising:
receiving an NB primary synchronization signal (NB PSS) of the NB synchronization signal generated by repetition of a first Zadoff-Chu sequence on a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the first Zadoff-Chu sequence having only one predefined root index; and
receiving an NB secondary synchronization signal (NB SSS) of the NB synchronization signal based on a second Zadoff-Chu sequence for identifying an NB cell identifier,
wherein the NB PSS is received in a state in which the first Zadoff-Chu sequence is multiplied in each of the plurality of OFDM symbols by each element of a cover sequence having a length corresponding to the number of the plurality of OFDM symbols,
wherein the NB SSS is received in a state in which the second Zadoff-Chu sequence is multiplied by each element of a scrambling sequence having a length corresponding to a length of the second Zadoff-Chu sequence, and
wherein a multiplication between the first Zadoff-Chu sequence and the cover sequence is in a unit of OFDM symbol while a multiplication between the second Zadoff-Chu sequence and the scrambling sequence is in a unit of an element of each sequence.
7. The method of claim 6 , wherein the NB synchronization signal is a synchronization signal for performing Internet of Things (IoT) communication operation through a narrow band corresponding to partial system bandwidth of the wireless communication system.
8. The method of claim 6 , wherein the plurality of OFDM symbols are consecutively arranged in a time domain.
9. The method of claim 6 , wherein the number of the plurality of OFDM symbols is equal to a difference between the number of OFDM symbols included in one subframe and the number of OFDM symbols available for transmission of a physical downlink control channel (PDCCH).
10. The method of claim 6 , wherein subcarrier spacing in a resource region where the NB synchronization signal is received is 15 kHz.
11. An evolved node B (eNB) for transmitting a narrowband (NB) synchronization signal to at least one user equipment (UE) in a wireless communication system, the eNB comprising:
a processor configured to:
generate an NB primary synchronization signal (NB PSS) of the NB synchronization signal by repeating a first Zadoff-Chu sequence on a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the first Zadoff-Chu sequence having only one predefined root index, and
generate an NB secondary synchronization signal (NB SSS) of the NB synchronization signal based on a second Zadoff-Chu sequence for identifying an NB cell identifier; and
a transceiver connected to the processor and configured to transmit the NB PSS and the NB SSS to the at least one UE,
wherein the processor is configured to generate the NB PSS by multiplying, in a unit of OFDM symbol, the first Zadoff-Chu sequence and each element of a predetermined cover sequence having a length corresponding to the number of the plurality of OFDM symbols, and
wherein the processor is configured to generate the NB SSS by multiplying, in a unit of an element of each sequence, the second Zadoff-Chu sequence and a scrambling sequence having a length corresponding to a length of the second Zadoff-Chu sequence.
12. The eNB of claim 11 , wherein the number of the plurality of OFDM symbols is equal to a difference between the number of OFDM symbols included in one subframe and the number of OFDM symbols available for transmission of a physical downlink control channel (PDCCH).
13. A user equipment (UE) for receiving a narrowband (NB) synchronization signal from an evolved node B (eNB) in a wireless communication system, the UE comprising:
a transceiver configured to:
receive an NB primary synchronization signal (NB PSS) of the NB synchronization signal generated by repetition of a first Zadoff-Chu sequence on a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the first Zadoff-Chu sequence having only one predefined root index, and
receive an NB secondary synchronization signal (NB SSS) of the NB synchronization signal based on a second Zadoff-Chu sequence for identifying an NB cell identifier; and
a processor configured to process the NB PSS and the NB SSS received by the transceiver,
wherein the NB PSS is received in a state in which the first Zadoff-Chu sequence is multiplied in each of the plurality of OFDM symbols by each element of a cover sequence having a length corresponding to the number of the plurality of OFDM symbols,
wherein the NB SSS is received in a state in which the second Zadoff-Chu sequence is multiplied by each element of a scrambling sequence having a length corresponding to a length of the second Zadoff-Chu sequence, and
wherein a multiplication between the first Zadoff-Chu sequence and the cover sequence is in a unit of OFDM symbol while a multiplication between the second Zadoff-Chu sequence and the scrambling sequence is in a unit of an element of each sequence.
14. The UE of claim 13 , wherein the number of the plurality of OFDM symbols is equal to a difference between the number of OFDM symbols included in one subframe and the number of OFDM symbols available for transmission of a physical downlink control channel (PDCCH).