FR2 QCL Signaling via MIB Subcarrier Spacing Reuse

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Solution Overview

Problem

The existing method for signaling quasi co-location (QCL) relation parameters in New Radio (NR) is not feasible for frequency range 2 (FR2) due to the limited bit availability in the master information block (MIB) signaling, particularly when supporting 120 kHz SS/PBCH block and 120 kHz CORESET #0 for Type0-PDCCH.

Innovation Solution

Repurpose the subCarrierSpacingCommon field in the MIB to indicate the QCL relation parameter for FR2, allowing for signaling of QCL properties using a single bit or in combination with other fields like controlResourceSetZero and searchSpaceZero, without relying on additional signaling bits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the existing method for signaling QCL relation parameters is used, then signaling is available for FR1, but the method is not feasible for FR2 due to limited bit availability in MIB signaling

Engineering Contradiction:

ImproveQCL relation parameter signaling capabilityVSAvoidMIB signaling structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The subCarrierSpacingCommon field in the MIB is repurposed to serve dual functions: indicating subcarrier spacing for Type0-PDCCH and signaling QCL relation parameters for FR2. This allows the same signaling bit to provide multiple pieces of information, enabling QCL relation parameter signaling for FR2 without adding extra signaling overhead or increasing MIB structure complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of information

If additional signaling bits are used to indicate QCL relation parameters for FR2, then QCL signaling capability is improved, but signaling overhead and MIB structure complexity increase

Engineering Contradiction:

ImproveQCL relation parameter informationVSAvoidsignaling bits

Core Design Contradiction:

Loss of informationVSQuantity of substance

Solution Approach 1:

The subCarrierSpacingCommon field is reused to carry QCL relation parameter information in addition to its original function of indicating subcarrier spacing. This repurposing allows QCL relation parameters to be signaled for FR2 without requiring any additional signaling bits, thus avoiding increased signaling overhead while still providing the necessary information.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12581317B2Signaling a quasi co-located, qcl, relation

Publication Date: 2026.03.17 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

According to certain embodiments, a method performed by a wireless device comprises determining a quasi-co location (QCL) relation parameter associated with Frequency Range 2 (FR2). The QCL relation parameter associated with FR2 is determined based on a subCarrierSpacingCommon field of a master information block for FR2 received in signaling from a network node. The method further comprises using the QCL relation parameter associated with FR2 when performing an operation of the wireless device for FR2.