# US 12,015,974 B2 · Determination of SSB/RMSI periodicity for IAB node

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- Number: US 12,015,974 B2
- Document ID: US12015974B2
- Status: Granted
- Kind: B2
- Application number: 18/151,815
- Filed: 2023-01-09
- Published: 2023-07-20
- Granted: 2024-06-18
- Earliest claimed: 2019-01-11
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Telefonaktiebolaget LM Ericsson (PUBL)
- Inventors: Lei Bao; Erik Dahlman; Zhipeng Lin
- Web page: https://patentgrep.com/patent/US12015974B2

## CPC

- H04W 48/12: using downlink control channel
- H04W 24/02: Arrangements for optimising operational condition
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 24/08: Testing, {supervising or monitoring} using real traffic
- H04W 56/001: {Synchronization between nodes}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

An IAB node performs a method for determining a periodicity of a SSB and/or a RMSI for use in an IAB backhaul link. The method may comprise one or more of: using a predetermined periodicity value; determining a periodicity value based on at least one different parameter; receiving a signaling message indicating a periodicity value and using the indicated periodicity value for the IAB backhaul link; and selecting a periodicity value from a plurality of permitted periodicity values.

## Claims

### Claim 1

A method performed at an integrated access and backhaul (IAB) node, comprising:
when performing initial cell search, assuming a predetermined synchronization signal block (SSB) transmission periodicity;
searching for an SSB of a cell at the predetermined SSB transmission periodicity;
acquiring system information from the searched SSB; and
setting up a connection to a first parent IAB node in the searched cell according to the acquired system information.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first parent IAB is donor IAB of the searched cell.

### Claim 3 (depends on 1)

The method of claim 1, wherein the method is performed by Mobile-Termination, MT, function of the IAB node.

### Claim 4 (depends on 1)

The method of claim 1, wherein acquiring system information from the searched SSB comprising:
obtaining actual SSB transmission periodicity from the acquired system information.

### Claim 5 (depends on 4)

The method of claim 4, wherein the obtained actual SSB transmission periodicity are for SSBs for specific use in an IAB backhaul link.

### Claim 6 (depends on 4)

The method of claim 4, wherein the obtained actual SSB transmission periodicity is for SSBs that are reused for access UEs.

### Claim 7 (depends on 4)

The method of claim 4, when an IAB backhaul link between the IAB node and the first parent IAB node get failure, further comprising:
searching for an SSB at the obtained actual periodicity of SSBs; and
setting up a connection to a second parent IAB node, wherein the second parent IAB node differs from the first parent IAB node.

### Claim 8 (depends on 1)

The method of claim 1, wherein the searching an SSB at the predetermined SSB transmission periodicity comprises, searching a set of SSBs at the predetermined SSB transmission periodicity regardless of periodicity information on SSBs indicated in a broadcast signal.

### Claim 9 (depends on 1)

The method of claim 1, wherein the IAB node is under a non-standalone (NSA) deployment.

### Claim 10

An integrated access and backhaul (IAB) node, comprising:
processing circuitry configured to execute program code stored in the memory, cause the IAB node to:
when performs initial cell search, assume a predetermined synchronization signal block (SSB) transmission periodicity;
search for an SSB of a cell at the predetermined SSB transmission periodicity;
acquire system information from the searched SSB; and
set up a connection to a first parent IAB node in the searched cell according to the acquired system information.

### Claim 11 (depends on 10)

The IAB node according to claim 10, wherein the first parent IAB is donor IAB of the searched cell.

### Claim 12 (depends on 10)

The IAB node according to claim 10, wherein the processing circuitry in Mobile-Termination, MT, function of the IAB node.

### Claim 13 (depends on 10)

The IAB node according to claim 10, wherein the memory includes instructions with, when executed by the processing circuitry, cause the IAB node to:
obtain actual SSB transmission periodicity from the acquired system information.

### Claim 14 (depends on 13)

The IAB node according to claim 13, wherein the memory further includes instructions with, when executed by the processing circuitry, cause the IAB node to:
when an IAB backhaul link between the IAB node and the first parent IAB node get failure, search for an SSB at the obtained actual periodicity of SSBs; and
set up a connection to a second parent IAB node, wherein the second parent IAB node differs from the first parent IAB node.

### Claim 15 (depends on 14)

The IAB node according to claim 14, wherein the IAB node is under an NSA deployment.

### Claim 16 (depends on 13)

The IAB node according to claim 13, wherein the obtained actual SSB transmission periodicity are SSBs that are for specific use in an IAB backhaul link.

### Claim 17 (depends on 13)

The IAB node according to claim 13, wherein the obtained actual SSB transmission periodicity is for SSBs that are reused for access UEs.

### Claim 18 (depends on 10)

The IAB node according to claim 10, wherein the IAB node is a terminal device.