# US 12,114,367 B2 · Random access procedure for unlicensed cells

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- Number: US 12,114,367 B2
- Document ID: US12114367B2
- Status: Granted
- Kind: B2
- Application number: 18/318,582
- Filed: 2023-05-16
- Published: 2023-09-14
- Granted: 2024-10-08
- Earliest claimed: 2019-06-25
- Assignees: Panasonic Intellectual Property Corporation of America
- Applicants: Panasonic Intellectual Property Corporation of America
- Inventors: Michael Einhaus; Joachim Loehr; Hidetoshi Suzuki; Li Wang
- Web page: https://patentgrep.com/patent/US12114367B2

## CPC

- H04W 72/02: Selection of wireless resources by user or terminal
- H04J 13/00: Code division multiplex systems (for frequency hopping H04B1/713)
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority}
- H04L 5/0082: {at predetermined intervals}
- H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)}
- H04W 52/00: Power management {, e.g. Transmission Power Control [TPC] or power classes}
- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04W 52/0219: {where the power saving management affects multiple terminals}
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 74/002: {Transmission of channel access control information}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 52/242: {taking into account path loss}
- H04W 52/50: at the moment of starting communication in a multiple access environment
- H04W 74/0838: using contention-free random access [CFRA]
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- 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)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A user equipment includes circuitry which selects a random access preamble sequence, and a transmitter which transmits the random access preamble sequence to a base station in a frequency bandwidth of an unlicensed band, and performs at least one of a first operation and a second operation. In the first operation, the circuitry selects a first sequence as the random access preamble sequence, the first sequence having a length longer than a length of a random preamble sequence used for a licensed band, and the transmitter transmits the first sequence in the frequency bandwidth of the unlicensed band. In the second operation, the circuitry selects a second sequence as the random access preamble sequence, the second sequence having a length equal to the length of a random preamble sequence used for the licensed band, and the transmitter transmits the second sequence with repetitions in the frequency bandwidth of the unlicensed band.

## Claims

### Claim 1

A user equipment, comprising:
circuitry, which, in operation, selects a random access preamble sequence; and
a transmitter, which, in operation, transmits the selected random access preamble sequence to a base station in a bandwidth of an unlicensed band,
wherein the bandwidth is defined based on a length of the random access preamble sequence and a subcarrier spacing, and is larger than a bandwidth of a random preamble sequence used in a licensed band, and is equal to or larger than a minimum bandwidth required for the unlicensed band.

### Claim 2 (depends on 1)

The user equipment according to claim 1, wherein the circuitry selects the random access preamble sequence having a length longer than a length of the random preamble sequence used in the licensed band.

### Claim 3 (depends on 1)

The user equipment according to claim 1, wherein the circuitry selects the random access preamble sequence having a length equal to a length of the random preamble sequence used in the licensed band.

### Claim 4 (depends on 1)

The user equipment according to claim 1, wherein the circuitry performs one of a first operation and a second operation,
in the first operation, the circuitry selects the random access preamble sequence having a length longer than a length of the random preamble sequence used in the licensed band, and
in the second operation, the circuitry selects the random access preamble sequence having a length equal to the length of the random preamble sequence used in the licensed band.

### Claim 5 (depends on 1)

The user equipment according to claim 1, wherein a length of the random access preamble sequence depends on a subcarrier spacing in the unlicensed band.

### Claim 6 (depends on 1)

The user equipment according to claim 1, wherein a length of the random access preamble sequence is notified by the base station.

### Claim 7

A random access method, comprising:
selecting a random access preamble sequence; and
transmitting the selected random access preamble sequence to a base station in a bandwidth of an unlicensed band,
wherein the bandwidth is defined based on a length of the random access preamble sequence and a subcarrier spacing, and is larger than a bandwidth of a random preamble sequence used in a licensed band, and is equal to or larger than a minimum bandwidth required for the unlicensed band.

### Claim 8 (depends on 7)

The random access method according to claim 7, wherein the selecting includes selecting the random access preamble sequence having a length longer than a length of the random preamble sequence used in the licensed band.

### Claim 9 (depends on 7)

The random access method according to claim 7, wherein the selecting includes selecting the random access preamble sequence having a length equal to a length of the random preamble sequence used in the licensed band.

### Claim 10 (depends on 7)

The random access method according to claim 7, wherein the selecting includes one of a first operation and a second operation,
in the first operation, selecting the random access preamble sequence having a length longer than a length of the random preamble sequence used in the licensed band, and
in the second operation, selecting the random access preamble sequence having a length equal to the length of the random preamble sequence used in the licensed band.

### Claim 11 (depends on 7)

The random access method according to claim 7, wherein a length of the random access preamble sequence depends on a subcarrier spacing in the unlicensed band.

### Claim 12 (depends on 7)

The random access method according to claim 7, wherein a length of the random access preamble sequence is notified by the base station.