TECHNICAL FIELD

The present invention relates to a method for transmitting and receiving system information, and more particularly, to a method for transmitting and receiving system information (e.g., minimum system information, remaining minimum system information (RMSI), other system information (OSI)) in a fifth generation (5G) communication system.

BACKGROUND ART

With the development of information and communication technology, various wireless communication technologies are being developed. Typical wireless communication technologies include long term evolution (LTE), new radio (NR), or the like defined as the 3rd generation partnership project (3GPP) standard. The LTE may be one of 4th generation (4G) wireless communication technologies, and the NR may be one of 5th generation (5G) wireless communication technologies.

A 5G communication system (e.g., communication system supporting the NR) using a frequency band (e.g., frequency band above 6 GHz) higher than a frequency band (e.g., frequency band below 6 GHz) of a 4G communication system (e.g., communication system supporting the LTE) as well as the frequency band of the 4G communication system has been considered for processing of wireless data which has rapidly increased since commercialization of the 4G communication system. The 5G communication system can support Enhanced Mobile Broadband (eMBB), Ultra-Reliable and Low-Latency Communication (URLLC), and massive Machine Type Communication (mMTC).

In order to support the services (e.g., eMBB, URLLC, mMTC, etc.) described above in the 5G communication system, a base station may transmit multiplexed channels and signals to a plurality of user equipments (UEs). System information may be classified into minimum system information, remaining minimum system information (RMSI), and other system information (OSI). Since a transmission channel and a transmission scheme are configured differently according to the type of system information, methods for efficiently transmitting and receiving system information are needed.

Meanwhile, the technology as the background of the invention is intended to enhance understanding of the background of the invention, and may include contents that are not known to the person of ordinary skill in the art.

DISCLOSURE

Technical Problem

The objective of the present invention to solve the above-described problem is to provide a method for transmitting and receiving system information in a communication system.

Technical Solution

An operation method of a UE, according to a first embodiment of the present invention for achieving the above-described objective, may comprise identifying minimum system information included in an SS/PBCH block received from a base station; receiving a PDCCH in a control resource set indicated by the minimum system information; identifying a time-frequency resource through which a PDSCH including RMSI is transmitted based on scheduling information included in the PDCCH; and obtaining the RMSI from the PDSCH received in the time-frequency resource, wherein the minimum system information includes an index of a starting symbol of the control resource set in time axis.

Here, the minimum system information may further include information indicating a length of the control resource set in time axis, and the length of the control resource set may correspond to a length of one symbol, two symbols, or three symbols.

Here, the minimum system information may further include information indicating a size of the control resource set in frequency axis and an offset between a reference position and a starting position of the control resource set in frequency axis.

Here, each of the size and the offset of the control resource set in the frequency axis may be configured in units of resource block.

Here, the minimum system information may further include information indicating a subcarrier spacing applied to each of the PDCCH and the PDSCH.

Here, the PDCCH may be configured according to an aggregation level of CCE, and the PDCCH may include one or more CCEs.

Here, the PDCCH may include one or more CCEs, and a starting CCE among the one or more CCEs included in the PDCCH may be configured differently for each UE belonging to a cell of the base station.

Here, the control resource set may be multiplexed with the SS/PBCH block in frequency axis, the PDSCH may be multiplexed with the SS/PBCH block in frequency axis, and a sum of a length of the control resource set and a length of the PDSCH in time axis may be equal to a length of the SS/PBCH block in time axis.

Here, a starting position of the control resource set in time axis may be equal to a starting position of the SS/PBCH block in time axis, and an ending position of the PDSCH in time axis may be equal to an ending position of the SS/PBCH block in time axis.

Here, the control resource set may be multiplexed with the SS/PBCH block in time axis, the PDSCH may be multiplexed with the SS/PBCH block in frequency axis, and a length of the PDSCH in time axis may be equal to a length of the SS/PBCH block in time axis.

Here, the control resource set may be multiplexed with the SS/PBCH block in time axis, and the PDSCH may be multiplexed with the SS/PBCH block in time axis.

An operation method of a base station, according to a second embodiment of the present invention for achieving the above-described objective, may comprise generating a PDSCH including RMSI; generating a PDCCH including scheduling information for the PDSCH; generating an SS/PBCH block including minimum system information indicating a control resource set through which the PDCCH is transmitted; and transmitting the SS/PBCH block, the PDCCH, and the PDSCH, wherein the minimum system information includes an index of a starting symbol of the control resource set in time axis.

Here, the minimum system information may further include information indicating a length of the control resource set in time axis, and the length of the control resource set may correspond to a length of one symbol, two symbols, or three symbols.

Here, the minimum system information may further include information indicating a size of the control resource set in frequency axis and an offset between a reference position and a starting position of the control resource set in frequency axis.

Here, the minimum system information may further include information indicating a subcarrier spacing applied to each of the PDCCH and the PDSCH.

Here, the PDCCH may be configured according to an aggregation level of CCE, and the PDCCH may include one or more CCEs.

Here, the control resource set may be multiplexed with the SS/PBCH block in frequency axis, the PDSCH may be multiplexed with the SS/PBCH block in frequency axis, and a sum of a length of the control resource set and a length of the PDSCH in time axis may be equal to a length of the SS/PBCH block in time axis.

Here, a starting position of the control resource set in time axis may be equal to a starting position of the SS/PBCH block in time axis, and an ending position of the PDSCH in time axis may be equal to an ending position of the SS/PBCH block in time axis.

Here, the control resource set may be multiplexed with the SS/PBCH block in time axis, the PDSCH may be multiplexed with the SS/PBCH block in frequency axis, and a length of the PDSCH in time axis may be equal to a length of the SS/PBCH block in time axis.

Here, the control resource set may be multiplexed with the SS/PBCH block in time axis, and the PDSCH may be multiplexed with the SS/PBCH block in time axis.

Advantageous Effects

According to the present invention, the base station can transmit a synchronization signal/physical broadcast channel (SS/PBCH) block including minimum system information indicating a control resource set, transmit a physical control channel (PDCCH) including scheduling information for a physical downlink shared channel (PDSCH) including remaining minimum system information (RMSI) in the control resource set indicated by the minimum system information, and transmit the PDSCH including the RMSI in time-frequency resources indicated by the scheduling information.

In this case, the user equipment (UE) can identify the location of the control resource set based on the minimum system information included in the SS/PBCH block received from the base station, receive the PDCCH in the identified control resource set, receive the PDSCH in the time-frequency resources indicated by the scheduling information included in the received PDCCH, and identify the RMSI included in the received PDSCH.

Therefore, transmission and reception procedures of system information can be efficiently performed in the communication system, and the performance of the communication system can be improved.

