# US 2021/0243656 A1 · Communication system

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- Number: US 2021/0243656 A1
- Document ID: US20210243656A1
- Status: Published application
- Kind: A1
- Application number: 16/973,246
- Filed: 2019-06-19
- Published: 2021-08-05
- Earliest claimed: 2018-06-22
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Robert PATERSON
- Web page: https://patentgrep.com/patent/US20210243656A1

## CPC

- H04W 36/0033: {with transfer of context information}
- H04W 36/087: {between radio units of access points}
- H04W 88/085: {Access point devices with remote components}
- H04W 92/20: between access points
- H04W 8/02: Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W 76/15: Setup of multiple wireless link connections
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method is presented in which a central unit of a distributed base station apparatus in a cellular communication system sends to a distributed unit of the distributed base station apparatus a first message comprising an information element for requesting the distributed unit of the distributed base station to provide a current distributed unit configuration. The central unit receives, from the distributed unit of the distributed base station apparatus, configuration information for the current distributed unit configuration in a second message sent in response to the first message.

## Claims

### Claim at position 1

1-25. (canceled)

### Claim 26

A method performed by a gNB Central Unit, gNB-CU, in a communication system, the method comprising:
sending, to a gNB Distributed Unit, gNB-DU, a user equipment, UE, CONTEXT MODIFICATION REQUEST message comprising an GNB-DU Configuration Query information element, IE, which is used to request the gNB-DU to provide configuration information for the gNB-DU; and
receiving, from the gNB-DU, configuration information comprising a cell group configuration of the gNB-DU in a UE CONTEXT MODIFICATION RESPONSE message sent in response to the UE CONTEXT MODIFICATION REQUEST message.

### Claim 27 (depends on 26)

The method according to claim 26,
wherein the gNB-CU receives the UE CONTEXT MODIFICATION RESPONSE message including a radio resource control (RRC) Information that are sent from the gNB-DU to the gNB-CU.

### Claim 28 (depends on 27)

The method according to claim 27,
wherein the RRC information comprises DU To CU RRC Information IE including CellGroupConfig IE that is used to configure a cell group.

### Claim 29 (depends on 27, 28)

The method according to claim 27 or 28,
wherein the gNB-CU performs RRC Reconfiguration in response to the UE CONTEXT MODIFICATION RESPONSE message.

### Claim 30

A gNB Central Unit, gNB-CU, in a communication system, the gNB-CU comprising:
a transceiver; and
a controller configured to control the transceiver to:
send, to a gNB Distributed Unit, gNB-DU, a user equipment, UE, CONTEXT MODIFICATION REQUEST message comprising an GNB-DU Configuration Query information element, IE, which is used to request the gNB-DU to provide configuration information for the gNB-DU; and
receive, from the gNB-DU, configuration information comprising a cell group configuration of the gNB-DU in a UE CONTEXT MODIFICATION RESPONSE message sent in response to the UE CONTEXT MODIFICATION REQUEST message.