# US 11,445,554 B2 · User equipment and base station apparatus

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- Number: US 11,445,554 B2
- Document ID: US11445554B2
- Status: Granted
- Kind: B2
- Application number: 16/638,833
- Filed: 2017-08-18
- Published: 2021-05-06
- Granted: 2022-09-13
- Earliest claimed: 2017-08-18
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Tomoya Ohara; Hiroki Harada
- Web page: https://patentgrep.com/patent/US11445554B2

## CPC

- H04L 27/26136: {Pilot sequence conveying additional information}
- H04W 74/0841: {with collision treatment}
- H04B 7/0413: MIMO systems
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)}
- H04L 27/2613: {Structure of the reference signals}
- H04L 27/2655: {Synchronisation arrangements}
- H04W 48/12: using downlink control channel
- H04W 56/001: {Synchronization between nodes}
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

User equipment communicates with a base station apparatus, and the user equipment includes a receiver that receives, from the base station apparatus, one or more blocks, wherein each of the one or more blocks includes information used for initial access and the information used for the initial access is associated with a beam transmitted from the base station apparatus; a controller that specifies a resource for transmitting a preamble based on the information included in the one or more blocks; a transmitter that transmits the preamble to the base station apparatus using the specified resource, wherein the information included in each of the one or more blocks includes a set for specifying a plurality of resources and preambles.

## Claims

### Claim 1

A terminal comprising:
a receiver that receives, from a base station, a plurality of blocks, each block of the plurality of blocks including a synchronization signal and first system information, and receives, from the base station, second system information based on the first system information;
a controller that acquires first information that is common to all random accesses and second information that is common to a part of the all random accesses based on the second system information, and configures a preamble and a resource to be used for a random access based on the first information and the second information; and
a transmitter that transmits the configured preamble to the base station by using the configured resource,
wherein the first information is common to all of the plurality of blocks, the second information is common to a part of the plurality of blocks, and the second information is not common to one or more blocks of the plurality of blocks other than the part of the plurality of blocks.

### Claim 2

A base station comprising:
a transmitter that transmits, to a terminal, a plurality of blocks, each block of the plurality of blocks including a synchronization signal and first system information, and transmits, to the terminal, second system information base on the first system information;
a controller that determines a preamble and a resource to be used for a random access based on first information that is common to all random accesses and second information that is common to a part of the all random accesses, wherein the first information and the second information is included in the second system information; and
a receiver that receives the determined preamble from the terminal by using the determined resource,
wherein the first information is common to all of the plurality of blocks, the second information is common to a part of the plurality of blocks, and the second information is not common to one or more blocks of the plurality of blocks other than the part of the plurality of blocks.

### Claim 3

A radio communication system comprising:
a terminal; and
a base station,
wherein the terminal includes:
a receiver that receives, from a base station, a plurality of blocks, each block of the plurality of blocks including a synchronization signal and first system information, and receives, from the base station, second system information based on the first system information;
a controller that acquires first information that is common to all random accesses and second information that is common to a part of the all random accesses based on the second system information, and configures a preamble and a resource to be used for a random access based on the first information and the second information; and
a transmitter that transmits the configured preamble to the base station by using the configured resource, and
wherein the base station includes:
a transmitter that transmits the plurality of blocks to the terminal, and transmits the second system information to the terminal;
a controller that determines the preamble and the resource to be used for the random access based on the first information that is common to the all random accesses and the second information that is common to the part of the all random accesses, wherein the first information and the second information is included in the second system information; and
a receiver that receives the determined preamble from the terminal by using the determined resource,
wherein the first information is common to all of the plurality of blocks, the second information is common to a part of the plurality of blocks, and the second information is not common to one or more blocks of the plurality of blocks other than the part of the plurality of blocks.