# US 12,192,882 B2 · Method for transceiving system information in wireless communication system supporting carrier aggregation, and apparatus therefor

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- Number: US 12,192,882 B2
- Document ID: US12192882B2
- Status: Granted
- Kind: B2
- Application number: 17/758,911
- Filed: 2020-01-31
- Published: 2023-02-16
- Granted: 2025-01-07
- Earliest claimed: 2020-01-31
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Bonghoe Kim
- Web page: https://patentgrep.com/patent/US12192882B2

## CPC

- H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00)
- H04W 76/15: Setup of multiple wireless link connections
- H04B 7/0408: using two or more beams, i.e. beam diversity
- H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection}
- H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence)
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04W 76/10: Connection setup
- H04W 76/20: Manipulation of established connections
- H04W 48/12: using downlink control channel
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method for receiving system information (SI) by a terminal in a wireless communication system supporting carrier aggregation (CA), according to one embodiment of the present specification, comprises: transmitting an RRC connection request message to a base station; receiving an RRC connection setup message from the base station; transmitting an RRC connection setup complete message to the base station; receiving an RRC reconfiguration message related to configuration of a secondary cell (SCell) from a primary cell (pCell) of the base station; and receiving a synchronization signal (SS) from the SCell based on the RRC reconfiguration message.

## Claims

### Claim 1

A method of receiving, by a user equipment (UE), system information (SI) in a wireless communication system supporting carrier aggregation (CA), the method comprising:
transmitting an RRC connection request message to a base station (BS);
receiving an RRC connection setup message from the BS;
transmitting an RRC connection setup complete message to the BS;
receiving, from a primary cell (PCell) of the BS, an RRC reconfiguration message related to a configuration of a secondary cell (SCell); and
receiving, from SCell of the BS, a synchronization signal (SS) based on the RRC reconfiguration message,
wherein the RRC reconfiguration message includes at least one of a master information block (MIB) of the SCell or a time point when the synchronization signal is transmitted, and
wherein an SS block related to the synchronization signal is transmitted based on beam information of the PCell and the time point when the synchronization signal is transmitted.

### Claim 2 (depends on 1)

The method of claim 1, wherein the SS block is one of a plurality of SS blocks transmitted based on the beam information of the PCell, and
wherein the beam information of the PCell includes at least one of a channel state information reference signal resource ID (CSI-RS resource ID), a precoding matrix index (PMI), or an SS block index (SSB index).

### Claim 3 (depends on 2)

The method of claim 2, wherein a frequency band in which the SCell operates is different from a frequency band in which the PCell operates.

### Claim 4 (depends on 3)

The method of claim 3, wherein a beam width of a signal transmitted from the SCell is smaller than a beam width of a signal transmitted from the PCell.

### Claim 5 (depends on 2)

The method of claim 2, wherein the time point when the synchronization signal is transmitted is expressed as a bitmap.

### Claim 6 (depends on 5)

The method of claim 5, wherein a number of bits of the bitmap is based on a total number of slots included in a radio frame.

### Claim 7 (depends on 2)

The method of claim 2, wherein the time point when the synchronization signal is transmitted is expressed as an index representing a slot in the radio frame.

### Claim 8 (depends on 7)

The method of claim 7, wherein a number of bits of the index is based on a number of the plurality of SS blocks.

### Claim 9 (depends on 8)

The method of claim 8, wherein the number of bits of the index is x*ceil(log2Ntot_sync_slot),
where x represents the number of the plurality of SS blocks, ceil( ) represents an operator of performing a rounding operation of a decimal point or less, and Ntot_sync_slot represents the number of slots in which the synchronization signal is transmitted in the radio frame.

### Claim 10 (depends on 1)

The method of claim 1, wherein a portion of the MIB is included in the RRC reconfiguration message and a remainder of the MIB is included in the synchronization signal.

### Claim 11 (depends on 10)

The method of claim 10, wherein the synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and
the remainder of the master information block (MIB) is included in the secondary synchronization signal (SSS).

### Claim 12 (depends on 1)

The method of claim 1, further comprising:
receiving a paging message from the PCell of the BS based on an RRC idle mode,
wherein the paging message includes information representing the SCell.

### Claim 13

A UE receiving system information (SI) in a wireless communication system supporting carrier aggregation (CA), the UE comprising:
one or more transceivers;
one or more processors; and
one or more memories operatively connectable to the one or more processors, and storing instructions of performing operations when the reception of the system information is executed by the one or more processors,
wherein the operations include
transmitting an RRC connection request message to a base station (BS);
receiving an RRC connection setup message from the BS;
transmitting an RRC connection setup complete message to the BS;
receiving, from a primary cell (PCell) of the BS, an RRC reconfiguration message
related to a configuration of a secondary cell (SCell); and
receiving, from the SCell of the BS, a synchronization signal (SS) based on the RRC reconfiguration message, and
wherein the RRC reconfiguration message includes at least one of a master information block (MIB) of the SCell or a time point when the synchronization signal is transmitted, and
wherein an SS block related to the synchronization signal is transmitted based on beam information of the PCell and the time point when the synchronization signal is transmitted.

### Claim 14

A method of transmitting, by a base station (BS), system information (SI) in a wireless communication system supporting carrier aggregation (CA), the method comprising:
receiving an RRC connection request message from a user equipment (UE);
transmitting an RRC connection setup message to the UE;
receiving an RRC connection setup complete message from the UE;
transmitting, to the UE, an RRC reconfiguration message related to a configuration of a secondary cell (SCell) through a primary cell (PCell); and
transmitting, to the UE, a synchronization signal (SS) based on the RRC reconfiguration message through the SCell, and
wherein the RRC reconfiguration message includes at least one of a master information block (MIB) of the SCell or a time point when the synchronization signal is transmitted, and
wherein an SS block related to the synchronization signal is transmitted based on beam information of the PCell and the time point when the synchronization signal is transmitted.