Obviousness

Obviousness Analysis under 35 U.S.C. § 103

This analysis identifies combinations of prior art references that would render the claims of US patent 11057896 obvious to a person having ordinary skill in the art (PHOSITA), and provides reasons why a PHOSITA would have been motivated to combine them. The priority date of US11057896 is November 1, 2018.

A PHOSITA in the field of wireless communications, particularly 5G New Radio (NR), would possess a strong understanding of 3GPP technical specifications, including physical layer procedures, radio resource control (RRC), and data transmission/reception. They would be familiar with concepts like beamforming, Quasi Co-Location (QCL), Control Resource Sets (CORESETs), Downlink Control Information (DCI), Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Channel Status Information-Reference Signal (CSI-RS), and the intricacies of managing multiple overlapping resources in the time and frequency domains for efficient and reliable wireless communication.

Prior Art References:

The patent explicitly references 3GPP specifications throughout its detailed description as background art. Key among these are:

• 3GPP TS 38.213 (Physical layer procedures for control): This specification defines the physical layer procedures for control in NR, including aspects related to CORESETs, search spaces, and PDCCH reception. Relevant versions include V15.9.0 (2020-04) and V16.3.0 (2020-11). The earlier versions, such as V16.2.0 (2020-07), V17.1.0 (2022-03), V18.6.0 (2025-07) and V18.6.0 (2025-07) are also available.
• 3GPP TS 38.214 (Physical layer procedures for data): This specification details the physical layer procedures for data in NR, covering PDSCH reception, DM-RS, and TCI states. Relevant versions include V15.2.0 (2018-06) and V15.8.0 (2020-01). The more recent versions of this specification are V17.4.0 (2023-01), V18.2.0 (2024-05) and V19.1.0 (2025-10).
• 3GPP TS 38.331 (Radio Resource Control (RRC) protocol specification): This specification defines the RRC protocol for NR, which is used for configuring various physical layer parameters, including CORESETs and search spaces. Relevant versions include V0.0.1 (2017-03), V15.2.1 (2018-06) and V15.7.0 (2019-10). Later versions, such as V17.4.0 (2023-05) and V18.6.0 (2025-07), are also available.

These 3GPP specifications represent highly relevant prior art, as they describe the foundational technologies and operating principles upon which the patent's claimed inventions are built. A PHOSITA would be intimately familiar with these documents and their contents, as they are the primary source for implementing and developing NR wireless communication systems.

Obviousness Combinations:

Combination 1: 3GPP TS 38.213 (V15.2.0, 2018-06) and 3GPP TS 38.331 (V15.2.1, 2018-06) to render Claims 1, 10, and 11 obvious.

Rationale:

• Monitoring CORESETs within an active BWP (Claims 1, 10, 11): 3GPP TS 38.213 and 38.331 extensively describe the configuration and monitoring of CORESETs within active BWPs for a UE in NR. For example, 3GPP TS 38.331 outlines the RRC procedures for configuring CORESETs and search spaces, which are essential for a UE to know where and when to monitor for PDCCHs.
• Applying QCL assumptions for aperiodic CSI-RS (Claims 1, 11): 3GPP TS 38.213 details the procedures for CSI-RS reception and the associated QCL assumptions. Aperiodic CSI-RS are a standard feature in NR for channel state information acquisition. The general concept of associating a QCL assumption with a reference signal for reception is well-established in these specifications. The challenge addressed by the patent is which QCL assumption to use when multiple CORESETs are involved.
• CORESET associated with a monitored search space configured with a lowest CORESET ID (Claims 1, 11): The prioritization of CORESETs or search spaces based on their IDs (e.g., lowest or highest ID) is a common mechanism in 3GPP specifications for resolving ambiguities or conflicts in resource allocation and monitoring. For instance, the patent itself mentions existing 3GPP behavior where a UE may select a CORESET containing a search space having the lowest search space ID in certain scenarios for determining a default PDSCH beam when multiple search spaces overlap in the time domain. A PHOSITA would understand that using the lowest CORESET ID for selection provides a deterministic and standardized approach for beam management. This principle could readily be extended to aperiodic CSI-RS reception, especially in scenarios with overlapping CORESETs, to ensure consistent behavior.
• Receiving DCI scheduling PDSCH from PDCCH and applying QCL assumption for PDCCH to receive PDSCH when scheduling offset is less than a threshold (Claim 10): 3GPP TS 38.213 and 38.214 describe the scheduling of PDSCH via DCI on the PDCCH, and the concept of a scheduling offset between the PDCCH and PDSCH. The use of QCL assumptions from the PDCCH for the reception of the scheduled PDSCH, particularly for short scheduling offsets, is a fundamental aspect of efficient beam management in NR to reduce beam switching latency. The patent's background section acknowledges this existing UE behavior, stating, "if the scheduling offset between the reception of the DL DCI and the corresponding PDSCH ... is less than a threshold ..., the UE may assume that the Demodulation-Reference Signal (DM-RS) ports of the PDSCH of a serving cell are quasi co-located with the RS(s) in the Transmission Configuration Indication (TCI) state with respect to the QCL assumption(s) used for the PDCCH QCL indication of the lowest CORESET ID in the latest slot..." This explicitly details the core elements of Claim 10 as existing prior art or at least as a recognized problem with proposed solutions in the context of NR.

Motivation for Combination:
A PHOSITA would be motivated to combine the teachings of 3GPP TS 38.213 and 38.331 to address the practical challenges of beam management in NR, particularly when multiple CORESETs are configured and potentially overlap. The need for deterministic rules to select QCL assumptions for both CSI-RS and PDSCH reception, especially in scenarios with short scheduling offsets, is driven by the desire to minimize undesirable beam switching and optimize spectral efficiency and latency in 5G networks. Using the lowest CORESET ID as a tie-breaker or a selection criterion is a logical and straightforward approach that a PHOSITA would naturally adopt to ensure consistent UE behavior across different deployments and avoid ambiguity, building upon established principles of ID-based prioritization within 3GPP.

Combination 2: 3GPP TS 38.213 (V15.8.0, 2020-01) and 3GPP TS 38.214 (V15.8.0, 2020-01) to render dependent Claims 8 and 9 obvious.

Rationale:

• Obtaining DCI scheduling PDSCH from the first CORESET and applying a second QCL assumption of a second CORESET to receive the PDSCH (Claim 8): 3GPP TS 38.213 and 38.214 would detail the process of a UE obtaining DCI for PDSCH scheduling from a CORESET (e.g., the "first CORESET" of claim 1/11). The concept of having different QCL assumptions for different resources, or even for PDSCHs scheduled by different CORESETs, is inherent in the flexible beam management framework of NR. The patent itself highlights scenarios where a PDSCH might overlap with a different CORESET (a "second CORESET") and how to handle the QCL assumption in such cases. The general mechanisms for QCL indication for PDSCH are described in these specifications.
• Scheduling offset less than a threshold, where the second CORESET overlaps the PDSCH (Claim 8): As discussed in Combination 1, the impact of scheduling offset on QCL assumption application for PDSCH is a known aspect of NR operation. The overlap of a PDSCH with another CORESET (the "second CORESET") is a scenario that a PHOSITA would anticipate and for which solutions would be sought within the existing NR framework.
• Second CORESET being a non-monitored CORESET associated with a non-monitored search space (Claim 9): The concept of non-monitored CORESETs or search spaces due to conflicts (e.g., QCL-TypeD conflicts) or prioritization rules is explicitly discussed in the patent's background. 3GPP specifications would cover the configuration of multiple CORESETs and the rules for a UE to determine which ones to monitor. The existence of "non-monitored" resources is a direct consequence of these configuration and monitoring rules. The problem of how to handle QCL assumptions when a PDSCH overlaps with such a non-monitored CORESET is a logical extension of beam management challenges in NR.

Motivation for Combination:
A PHOSITA would be motivated to combine the teachings of 3GPP TS 38.213 and 38.214 to address the complexities of PDSCH reception in dynamic NR environments. When a PDSCH overlaps with a non-monitored CORESET, a PHOSITA would seek a robust mechanism to ensure the correct QCL assumption is applied. The motivation would be to maintain seamless data reception, avoid performance degradation due to incorrect beamforming, and reconcile potential conflicts arising from overlapping resources and different monitoring statuses. The various "Cases" discussed in the patent's detailed description (e.g., Case 3.1, 3.3) demonstrate that these are recognized problems within the NR specification development, suggesting that a PHOSITA would be actively trying to find a systematic way to manage QCL assumptions in such scenarios using the existing toolkit provided by the 3GPP specifications. For example, prioritizing the monitored CORESET's QCL assumption or having rules for when a non-monitored CORESET's QCL assumption could be used (e.g., for non-overlapped portions) would be within the purview of a PHOSITA seeking to optimize NR performance.