# US 2018/0324850 A1 · Apparatus and method for managing random access channel configuration in wireless communication system

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- Number: US 2018/0324850 A1
- Document ID: US20180324850A1
- Status: Published application
- Kind: A1
- Application number: 15/971,602
- Filed: 2018-05-04
- Published: 2018-11-08
- Earliest claimed: 2017-05-05
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd
- Inventors: Saidhiraj AMURU; Hyunil YOO; Anshuman NIGAM; Ji-Yun SEOL; Taeyoung KIM
- Web page: https://patentgrep.com/patent/US20180324850A1

## CPC

- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04B 7/088: {using beam selection}
- H04J 11/0073: {Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group}
- H04J 11/0076: {Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group}
- H04J 11/0079: {Acquisition of downlink reference signals, e.g. detection of cell-ID}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 48/12: using downlink control channel
- H04L 5/0023: {Time-frequency-space}
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04W 52/146: {Uplink power control}
- H04W 52/16: Deriving transmission power values from another channel
- H04W 52/281: {taking into account user or data type priority}
- H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range}
- H04W 52/42: in systems with time, space, frequency or polarisation diversity
- H04W 52/50: at the moment of starting communication in a multiple access environment
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0836: with 2-step access
- H04W 74/0838: using contention-free random access [CFRA]
- 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

The present disclosure is related to a 5th generation (5G) or pre-5G communication system for supporting a higher data rate than a 4th generation (4G) communication system such as long term evolution (LTE). According to various embodiments of the present disclosure, a method for operating a base station in a wireless communication system is provided. The method comprises: generating remaining minimum system information (RMSI) comprising random access channel (RACH) configuration, wherein the RACH configuration comprises an association between RACH resources and one of a synchronization signal (SS) block and channel state information reference signal (CSI-RS) resources; and transmitting, to a user equipment (UE), the RMSI.

## Claims

### Claim 1

A method for operating a base station in a wireless communication system, the method comprising:
generating remaining minimum system information (RMSI) comprising random access channel (RACH) configuration, wherein the RACH configuration comprises relationship information between RACH resources and one of a synchronization signal (SS) block or channel state information reference signal (CSI-RS) resources; and
transmitting, to a user equipment (UE), the RMSI.

### Claim 2 (depends on 1)

The method of claim 1, wherein the RACH configuration is broadcast in SS blocks used for the RMSI within a cell.

### Claim 3 (depends on 1)

The method of claim 1, wherein the RACH configuration comprises one of a common RACH configuration across all SS blocks, a part of RACH configuration common across all SS blocks, or a different RACH configuration across all SS blocks.

### Claim 4 (depends on 1)

The method of claim 1, wherein the RACH configuration in the RMSI indicates a numerology for at least one of RACH message 1, RACH message 2, RACH message 3, or RACH message 4.

### Claim 5 (depends on 1)

The method of claim 1, wherein the relationship information between the RACH resources and the one of the SS block or the CSI-RS resource is determined based on at least one of a time based mapping or a frequency based mapping.

### Claim 6 (depends on 1)

The method of claim 1, a plurality of bits for the RACH configuration in the RMSI is indicated to the UE using at least one of the RMSI, a physical downlink control channel (PDCCH) RMSI or a physical broadcast channel (PBCH).

### Claim 7 (depends on 6)

The method of claim 6, wherein the RACH configuration in the RMSI is configured based on one of a most significant bit (MSB) of the plurality of bits or a least significant bit (LSB) of the plurality of bits.

### Claim 8

A method for operating a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station, remaining minimum system information (RMSI) comprising random access channel (RACH) configuration, wherein the RACH configuration comprises relationship information between RACH resources and one of a synchronization signal (SS) block and channel state information reference signal (CSI-RS) resources; and
performing a random access procedure based on the relationship information.

### Claim 9 (depends on 8)

The method of claim 8, wherein the RACH configuration is broadcast in SS blocks used for the RMSI within a cell.

### Claim 10 (depends on 8)

The method of claim 8, wherein the RACH configuration comprises one of a common RACH configuration across all SS blocks, a part of RACH configuration common across all SS blocks, or a different RACH configuration across all SS blocks.

### Claim 11 (depends on 8)

The method of claim 8, wherein the RACH configuration in the RMSI indicates a numerology for at least one of RACH message 1, RACH message 2, RACH message 3, or RACH message 4.

### Claim 12 (depends on 8)

The method of claim 8, wherein the relationship information between the RACH resources and the one of the SS block or the CSI-RS resource is determined based on at least one of a time based mapping or a frequency based mapping.

### Claim 13 (depends on 8)

The method of claim 8, further comprising: decoding a plurality of bits for the RACH configuration in the RMSI using at least one of the RMSI, a physical downlink control channel (PDCCH) RMSI and a physical broadcast channel (PBCH) from the base station.

### Claim 14 (depends on 13)

The method of claim 13, further comprising decoding the RACH configuration in the RMSI based on one of a most significant bit (MSB) of the plurality of bits or a least significant bit (LSB) of the plurality of bits.

### Claim 15

A user equipment (UE) in a wireless communication system, the UE comprising:
a transceiver; and
at least one processor coupled to the transceiver, the at least one processor configured to:
receive, from a base station, a remaining minimum system information (RMSI) comprising random access channel (RACH) configuration, wherein the RACH configuration comprises relationship information between RACH resources and one of a synchronization signal (SS) block or channel state information reference signal (CSI-RS) resources; and
perform a random access procedure based on the relationship information.

### Claim 16 (depends on 15)

The UE of claim 15, wherein the RACH configuration is broadcast in SS blocks used for the RMSI within a cell.

### Claim 17 (depends on 15)

The UE of claim 15, wherein the RACH configuration comprises one of a common RACH configuration across all SS blocks, a part of RACH configuration common across all SS blocks, or a different RACH configuration across all SS blocks.

### Claim 18 (depends on 15)

The UE of claim 15, wherein the RACH configuration in the RMSI indicates a numerology for at least one of RACH message 1, RACH message 2, RACH message 3, or RACH message 4.

### Claim 19 (depends on 15)

The UE of claim 15, wherein the relationship information between the RACH resources and the one of the SS block or the CSI-RS resource is determined based on at least one of a time based mapping or a frequency based mapping.

### Claim 20 (depends on 15)

The UE of claim 15, wherein the at least one processor is further configured to decode a plurality of bits for the RACH configuration in the RMSI using at least one of RMSI, a physical downlink control Channel (PDCCH) RMSI and a physical broadcast channel (PBCH) from the base station.