# US 11,910,230 B2 · Method for processing data in relay node, and device therefor

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- Number: US 11,910,230 B2
- Document ID: US11910230B2
- Status: Granted
- Kind: B2
- Application number: 17/051,023
- Filed: 2019-07-25
- Published: 2021-04-29
- Granted: 2024-02-20
- Earliest claimed: 2018-07-30
- Assignees: Kt Corporation
- Applicants: Kt Corporation
- Inventors: Sung-pyo Hong
- Web page: https://patentgrep.com/patent/US11910230B2

## CPC

- H04B 7/15528: {Control of operation parameters of a relay station to exploit the physical medium}
- H04W 28/04: Error control
- H04L 1/0007: {by modifying the frame length}
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04L 1/1896: {ARQ related signaling}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 28/0278: {using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12)}
- H04W 40/22: using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 76/11: Allocation or use of connection identifiers
- H04W 80/02: Data link layer protocols
- H04W 88/14: Backbone network devices
- H04L 1/0002: {by adapting the transmission rate}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 2001/0097: {Relays}
- H04W 28/0289: {Congestion control (load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12)}
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Provided are methods and apparatuses of processing data in an integrated access and backhaul (IAB) node using new radio (NR) wireless communication technology. The method of an integrated access and backhaul (IAB) node processes data, includes: configuring a mobile-termination (MT) function and a distribute unit function of the IAB node; monitoring an uplink buffer state or a downlink buffer state in the IAB node; and transmitting downlink buffer state information or uplink buffer state information to the donor base station or an associated parent IAB node on the basis of a monitoring result of the uplink buffer state or the downlink buffer state.

## Claims

### Claim 1

A method of an integrated access and backhaul (IAB) node for processing data, the method comprising:
configuring a mobile-termination (MT) function and a distribute unit (DU) function of the IAB node;
monitoring an uplink buffer status or a downlink buffer status in the IAB node; and
transmitting downlink buffer status information or uplink buffer status information to a donor base station or an associated parent IAB node based on a result of the monitoring for the uplink buffer status or the downlink buffer status,
wherein the uplink buffer status information or the downlink buffer status information is transmitted to the associated parent IAB node by being included in a backhaul adaptation protocol (BAP) control protocol data unit (PDU),
wherein the downlink buffer status information includes buffer size information per backhaul radio link control (RLC) channel identifier information,
wherein the uplink buffer status information transmitted to the associated parent IAB node includes expected buffer size information distinguished from a buffer size of the IAB node, and the expected buffer size information is information on an amount of data expected to arrive at the IAB node in a predetermined amount of time, from a child IAB node associated with the IAB node, and
wherein the uplink buffer status information including the expected buffer size information is transmitted through a medium access control (MAC) control element (MAC CE) having logical channel identification information different from the uplink buffer status information not including expected buffer size information,
wherein when the IAB node received uplink user data, the IAB node selects the backhaul RLC channel for transmitting the uplink user data based on donor base station address information, and
wherein the transmission of the uplink buffer status information transmitted to the associated parent IAB node is triggered even when a buffer status report from a child IAB node associated with the IAB node is received,
wherein the logical channel identification information for the uplink buffer status information including the expected buffer size information is set to a value different from 59 to 62 used in the uplink buffer status information that does not include the expected buffer size information.

### Claim 2

An integrated access and backhaul (IAB) node processing data comprising:
a controller configured to configure a mobile-termination (MT) function and a distribute unit (DU) function of the TAB node and monitor an uplink buffer status or a downlink buffer status in the TAB node; and
a transmitter configured to transmit downlink buffer status information or uplink buffer status information to a donor base station or an associated parent TAB node based on a result of the monitoring for the uplink buffer status or the downlink buffer status,
wherein the uplink buffer status information or the downlink buffer status information is transmitted to the associated parent TAB node by being included in a backhaul adaptation protocol (BAP) control protocol data unit (PDU),
wherein the downlink buffer status information includes buffer size information per backhaul radio link control (RLC) channel identifier information
wherein the uplink buffer status information transmitted to the associated parent TAB node includes expected buffer size information distinguished from a buffer size of the TAB node, and the expected buffer size information is information on an amount of data expected to arrive in a predetermined amount of time at the TAB node from a child TAB node associated with the TAB node, and
wherein the uplink buffer status information including the expected buffer size information is transmitted through a medium access control (MAC) control element (MAC CE) having logical channel identification information different from the uplink buffer status information not including expected buffer size information,
wherein when the TAB node received uplink user data, the controller selects the backhaul RLC channel for transmitting the uplink user data based on donor base station address information, and
wherein the transmission of the uplink buffer status information transmitted to the associated parent IAB node is triggered even when a buffer status report from a child IAB node associated with the IAB node is received,
wherein the logical channel identification information for the uplink buffer status information including the expected buffer size information is set to a value different from 59 to 62 used in the uplink buffer status information that does not include the expected buffer size information.