Method and apparatus for supporting fast link recovery and link status reporting in wireless communication system

Patent metadata

Field	Value
Publication number	US-2020022054-A1
Application number	US-201916509211-A
Country	US
Kind code	A1
Filing date	Jul 11, 2019
Priority date	Jul 11, 2018
Publication date	Jan 16, 2020
Grant date	—

Abstract

A method and apparatus for supporting a fast link recovery and link status reporting in a wireless communication system is provided. When a node detects a radio link problem on a wireless backhaul link between integrated access and backhaul (IAB) nodes from the node to a donor node of an TAB network, the node reselects a cell operated by a gNB which is directly connected to the donor node, and performs a random access procedure towards the cell operated by the gNB to report information on the radio link problem to the cell. The donor node may establish a new path for the node.

First claim

What is claimed is:

1 . A method performed by a node in a wireless communication system, the method comprising:
detecting a radio link problem on a wireless backhaul link between integrated access and backhaul (IAB) nodes from the node to a donor node of an IAB network; reselecting a cell operated by a gNB which is directly connected to the donor node; performing a random access procedure towards the cell operated by the gNB; and reporting information on the radio link problem to the cell.

2 . The method of claim 1 , wherein the gNB is in proximity of the node.

3 . The method of claim 1 , wherein the gNB does not belongs to the IAB network.

4 . The method of claim 1 , wherein the radio link problem includes a radio link failure (RLF), a case that a specific criteria of a reference signal received power (RSRP) threshold is not satisfied and/or a case that a specific criteria of throughput threshold is not satisfied.

5 . The method of claim 1 , wherein an offset is applied to the cell.

6 . The method of claim 1 , wherein the cell is reselected based on an RSRP of the cell.

7 . The method of claim 6 , wherein the RSRP of the cell is better than any other cells of other gNBs or other IAB nodes.

8 . The method of claim 1 , wherein an access priority is applied to the cell even when an RSRP of the cell is worse than IAB nodes in proximity.

9 . The method of claim 1 , wherein the information on the radio link problem includes identifiers (IDs) of the TAB nodes and/or an ID of the donor node.

10 . The method of claim 1 , wherein the information on the radio link problem includes an ID of an IAB node of which measured RSRP is better than any other IAB nodes.

11 . The method of claim 1 , wherein a new path from the donor node to the node is selected by the donor node.

12 . The method of claim 1 , wherein the node includes an IAB node including both a user equipment (UE) part and a mobile terminating (MT) part.

13 . The method of claim 1 , wherein the node includes a UE.

14 . The method of claim 1 , wherein the donor node includes a central unit (CU) and a distributed unit (DU).

15 . The method of claim 1 , wherein the first node is in communication with at least one of a user equipment, a network, and/or autonomous vehicles other than the first node.

16 . A node in a wireless communication system, the node comprising:
a memory; a transceiver; and a processor, operably coupled to the memory and the transceiver, wherein the node is configured to: detect a radio link problem on a wireless backhaul link between integrated access and backhaul (IAB) nodes from the node to a donor node of an IAB network, reselect a cell operated by a gNB which is directly connected to the donor node, perform a random access procedure towards the cell operated by the gNB, and report, via the transceiver, information on the radio link problem to the cell.

17 . A processor for a node in a wireless communication system, wherein the processor is configured to:
detect a radio link problem on a wireless backhaul link between integrated access and backhaul (IAB) nodes from the node to a donor node of an TAB network, reselect a cell operated by a gNB which is directly connected to the donor node, perform a random access procedure towards the cell operated by the gNB, and control the node to report information on the radio link problem to the cell.

Assignees

• Lg Electronics Inc

Inventors

• Hong Jongwoo
• Kim Taehun
• Byun Daewook
• Byun Bokyung

Classifications

• H04W84/047

  using dedicated repeater stations · CPC title

• H04W84/18

  Self-organising networks, e.g. ad-hoc networks or sensor networks · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04W48/20

  Selecting an access point · CPC title

• H04B17/391

  Modelling the propagation channel · CPC title