Device and method for acquiring system information by decoding signals in wireless communication system

1. A method performed by a terminal in a wireless communication system, the method comprising:

receiving, from a base station, a first synchronization signal (SS) block, which is transmitted using a first beam of the base station, wherein the first SS block includes a master information block (MIB) and a first index associated with the first beam;

receiving, from the base station, a second SS block, which is transmitted using a second beam of the base station, wherein the second SS block includes the MIB and a second index associated with the second beam; and

acquiring the MIB by decoding the second SS block with compensating a difference between the first index and the second index from the first SS block.

2. The method of claim 1 , further comprising:

based on channel qualities of signals transmitted using multiple beams of the base station, determining at least two decoding beams among the multiple beams,

wherein the at least two decoding beams include the first beam and the second beam.

3. The method of claim 2 ,

wherein the first beam corresponds to a highest channel quality from among the multiple beams,

wherein the second beam corresponds to a second path, and

wherein a correlation between a first path associated with the first beam and the second path is equal to or smaller than a threshold.

4. The method of claim 2 , further comprising:

transmitting, to the base station, feedback information for indicating a beam having a highest channel quality from among the multiple beams,

wherein the second beam is different from the beam indicated by the feedback information.

5. The method of claim 1 ,

wherein the first SS block includes a primary SS (PSS), a secondary SS (SSS), and a physical broadcast channel (PBCH) providing the MIB,

wherein the second SS block includes the PSS, the SSS, and a PBCH providing the MIB, and

wherein the MIB includes information on at least one parameter for obtaining a system information block (SIB) 1 including other scheduling information of other SIB.

6. The method of claim 1 , wherein the acquiring of the MIB comprises:

based on first probability information for a physical broadcast channel (PBCH) of the first SS block and second probability information for a PBCH of the second SS block, acquiring combined probability information for the MIB; and

acquiring the MIB by performing the decoding based on the combined probability information.

7. The method of claim 1 ,

wherein the acquiring of the MIB comprises:

performing the decoding by applying a first weight to the first SS block and applying a second weight to the second SS block, and

wherein the first weight and the second weight are determined based on a first channel quality for the first SS block and a second channel quality for the second SS block.

8. The method of claim 1 , wherein the acquiring of the MIB comprises:

decoding the second SS block in response to detection of a failure of decoding the first SS block.

9. The method of claim 1 , further comprising:

acquiring a third channel quality for a third SS block transmitted using a third beam of the base station;

comparing the third channel quality with a fourth channel quality of a fourth beam of decoding beam set, the fourth beam having a lowest channel quality from among the decoding beam set;

if the fourth channel quality is equal to or higher than the third channel quality, not storing the third beam in the decoding beam set; and

if the fourth channel quality is lower than the third channel quality, storing the third beam in the decoding beam set, as a new decoding beam.

10. A terminal device in a wireless communication system, the device comprising:

at least one processor; and

at least one transceiver operatively coupled to the at least one processor,

wherein the at least one transceiver is configured to:

receive, from a base station, a first synchronization signal (SS) block, which is transmitted using a first beam of the base station, wherein the first SS block includes a master information block (MIB) and a first index associated with the first beam, and

receive, from the base station, a second SS block, which is transmitted using a second beam of the base station, wherein the second SS block includes the master information block (MIB) and a second index associated with the second beam; and

wherein the at least one processor is configured to acquire the MIB by decoding the second SS block with compensating a difference between the first index and the second index from the first SS block.

11. The device of claim 10 ,

wherein the at least one processor is further configured to determine, based on channel qualities of respective signals transmitted using multiple beams of the base station, at least two decoding beams among the multiple beams, and

wherein the at least two decoding beams include the first beam and the second beam.

12. The device of claim 11 ,

wherein the first beam corresponds to a highest channel quality from among the multiple beams,

wherein the second beam corresponding to a second path, and

wherein a correlation between a first path associated with the first beam and the second path is equal to or smaller than a threshold.

13. The device of claim 10 ,

wherein, in order to acquire the MIB, the at least one processor is configured to perform the decoding by applying a first weight to the first SS block and applying a second weight to the second SS block, wherein the first weight and the second weight are determined based on a first channel quality for the first SS block and a second channel quality for the second SS block.

14. The device of claim 10 , wherein, in order to acquire the MIB, the at least one processor is configured to decode the second SS block in response to detection of a failure of decoding the first SS block.

15. The method of claim 5 , further comprising:

acquiring the SIB 1 by decoding a second signal associated with the second index in combination with a first signal associated with the first index, and

wherein the first signal is used to convey the SIB 1 and the second signal is used to convey the SIB 1.

16. The device of claim 10 ,

wherein the first SS block includes a primary SS (PSS), a secondary SS (SSS), and a physical broadcast channel (PBCH) providing the MIB,

wherein the second SS block includes the PSS, the SSS, and a PBCH providing the MIB, and

wherein the MIB includes information on at least one parameter for obtaining a system information block (SIB) 1 including other scheduling information of other SIB.

17. The device of claim 16 ,

wherein the at least one processor is further configured to acquire the SIB 1 by decoding a second signal associated with the second index in combination with a first signal associated with the first index, and

wherein the first signal is used to convey the SIB 1 and the second signal is used to convey the SIB 1.