# US 12,016,059 B2 · Early data transmission in CU-DU split

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- Number: US 12,016,059 B2
- Document ID: US12016059B2
- Status: Granted
- Kind: B2
- Application number: 17/310,029
- Filed: 2019-12-31
- Published: 2022-04-28
- Granted: 2024-06-18
- Earliest claimed: 2019-02-12
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seokjung Kim; Jian Xu; Daewook Byun
- Web page: https://patentgrep.com/patent/US12016059B2

## CPC

- H04W 76/10: Connection setup
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 76/30: Connection release
- H04W 88/085: {Access point devices with remote components}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided are a method for early data transmission. According to an embodiment of the present disclosure, the method includes transmitting a radio resource control (RRC) connection resume request message to a control plane (CP) of central unit (CU) of the network node, receiving information informing that downlink (DL) data exists from the CP, receiving DL data from a user plane (UP) of the CU, transmitting the DL data to a wireless device in response to the information, upon receiving the DL data, and releasing transmission resources after transmitting the DL data.

## Claims

### Claim 1

A method performed by a distributed unit (DU) of a network node adapted to operate in a wireless communication system, the method comprising:
transmitting a radio resource control (RRC) resume request message to a central unit (CU) control plane (CP) of the network node;
upon a determination by the CU-CP to perform early data transmission (EDT) based on the RRC resume request message, transmitting uplink (UL) data to a CU-user plane (UP) of the network node;
receiving information informing that downlink (DL) data exists from the CU-CP;
receiving the DL data from the CU-UP;
transmitting the DL data to a wireless device in response to the information, upon receiving the DL data; and
releasing transmission resources after transmitting the DL data,
wherein the DU is a logical node hosting radio link control (RLC), media access control (MAC) and physical layers of the network node,
wherein the CU-CP is a logical node hosting radio resource control (RRC) and a control plane part of a packet data convergence protocol (PDCP) of the network node, and
wherein the CU-UP is a logical node hosting a user plane part of the PDCP of the network node.

### Claim 2 (depends on 1)

The method of claim 1, wherein the information is received with an RRC message.

### Claim 3 (depends on 2)

The method of claim 2, wherein the RRC message informs to release the transmission resources.

### Claim 4 (depends on 2)

The method of claim 2, wherein the transmitting the DL data includes multiplexing the DL data with the RRC message.

### Claim 5 (depends on 1)

The method of claim 1, wherein the information informs the DU of waiting for releasing the transmission resources until reception of the DL data.

### Claim 6 (depends on 1)

The method of claim 1, wherein the UL data is forwarded to a core network upon successful resume of a bearer context of the wireless device.

### Claim 7 (depends on 1)

The method of claim 1, wherein the wireless device communicates with at least one of a mobile terminal, a network or autonomous vehicles other than the wireless device.

### Claim 8

A distributed unit (DU) of a network node adapted to operate in a wireless communication system, the DU comprising:
a memory;
a transceiver; and
a processor, operably coupled to the memory and the transceiver, and configured to:
control the transceiver to transmit a radio resource control (RRC) resume request message to a CU) control plane (CP) of the network node;
upon a determination by the CU-CP to perform early data transmission (EDT) based on the RRC resume request message, control the transceiver to transmit uplink (UL) data to a CU-user plane (UP) of the network node;
control the transceiver to receive information informing that downlink (DL) data exists from the CU-CP;
control the transceiver to receive the DL data from the CU-UP;
control the transceiver to transmit the DL data to a wireless device in response to the information, upon receiving the DL data; and
release transmission resources after transmitting the DL data,
wherein the DU is a logical node hosting radio link control (RLC), media access control (MAC) and physical layers of the network node,
wherein the CU-CP is a logical node hosting radio resource control (RRC) and a control plane part of a packet data convergence protocol (PDCP) of the network node, and
wherein the CU-UP is a logical node hosting a user plane part of the PDCP of the network node.

### Claim 9 (depends on 8)

The DU of claim 8, wherein the information is received with an RRC message.

### Claim 10 (depends on 9)

The DU of claim 9, wherein the RRC message informs to release the transmission resources.

### Claim 11 (depends on 9)

The DU of claim 9, wherein the transmitting the DL data includes multiplexing the DL data with the RRC message.

### Claim 12 (depends on 8)

The DU of claim 8, wherein the information informs the DU of waiting for releasing the transmission resources until reception of the DL data.

### Claim 13 (depends on 8)

The DU of claim 8, wherein the UL data is forwarded to a core network upon successful resume of a bearer context of the wireless device.