# US 2021/0243683 A1 · Radio communication apparatus and radio communication method

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- Number: US 2021/0243683 A1
- Document ID: US20210243683A1
- Status: Published application
- Kind: A1
- Application number: 17/269,797
- Filed: 2019-07-24
- Published: 2021-08-05
- Earliest claimed: 2018-08-23
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Hiroki Harada
- Web page: https://patentgrep.com/patent/US20210243683A1

## CPC

- H04W 24/02: Arrangements for optimising operational condition
- H04W 48/16: Discovering, processing access restriction or access information
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04W 88/14: Backbone network devices
- H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00)
- H04W 84/042: {Public Land Mobile systems, e.g. cellular systems}
- 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

An IAB donor is properly grasped. A radio communication apparatus according to one aspect of the present disclosure includes a transmitting/receiving unit that communicates with an integrated access backhaul (IAB) node, and a control unit that determines whether or not the IAB node has a function of an IAB donor based on a predetermined signal or channel received from the IAB node.

## Claims

### Claim 1

A radio communication apparatus comprising:
a transmitting/receiving unit that communicates with an integrated access backhaul (IAB) node; and
a control unit that determines whether or not the IAB node has a function of an IAB donor based on a predetermined signal or channel received from the IAB node.

### Claim 2 (depends on 1)

The radio communication apparatus according to claim 1, wherein the predetermined signal or channel is a synchronization signal/broadcast channel (synchronization signal/physical broadcast channel (SS/PBCH)) block or a channel state information reference signal (CSI-RS) that has a characteristic different from characteristics of an SS/PBCH block or CSI-RS for access link.

### Claim 3 (depends on 1)

The radio communication apparatus according to claim 1, wherein the predetermined signal or channel is a signal or channel that is multiplexed with a synchronization signal/broadcast channel (synchronization signal/physical broadcast channel (SS/PBCH)) block or a channel state information reference signal (CSI-RS) that is an IAB node discovery signal by using at least one of time division multiplexing (TDM), frequency division multiplexing (FDM), or space division multiplexing (SDM).

### Claim 4

A radio communication method of a radio communication apparatus, comprising:
a step of communicating with an integrated access backhaul (IAB) node; and
a step of determining whether or not the IAB node has a function of an IAB donor based on a predetermined signal or channel received from the IAB node.