Hybrid Multiband Scheduling for MUST Interference Conflict Resolution

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Solution Overview

Problem

Subband scheduling in wireless communication networks with multi-user superposition transmission (MUST) experiences increased complexity due to conflicts and inefficiencies, particularly when UEs are scheduled as both near and far in different subbands, leading to suboptimal performance and higher computational costs.

Innovation Solution

A method to determine UE candidate sets for MUST scheduling across subbands, ordering them by a wideband scheduling metric, resolving conflicts by excluding inconsistent MUST positions, and performing subband scheduling using either MUST or OMA transmission, thereby reducing complexity and improving performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If subband scheduling is implemented with MUST, then scheduling flexibility and resource allocation efficiency are improved, but computational complexity and scheduling conflicts increase

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidscheduling complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The frequency band is divided into multiple subbands, allowing independent scheduling decisions for each subband. This segmentation enables the system to apply MUST in subbands where it benefits resource allocation while using OMA in subbands where complexity should be avoided, thus resolving the contradiction between scheduling flexibility and computational complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The scheduling method dynamically selects between MUST and OMA transmission modes for each subband based on current channel conditions and UE positions. This dynamic adaptation allows the system to optimize resource allocation efficiency when conditions permit while falling back to simpler OMA scheduling when complexity should be minimized

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If UEs are scheduled as both near and far in different subbands, then scheduling flexibility is improved, but interference cancellation complexity and performance degradation increase

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidinterference cancellation performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system applies different transmission modes (MUST or OMA) to different subbands based on local channel conditions and UE positions. A UE can be scheduled as near or far in different subbands independently, allowing the system to optimize local performance while managing overall complexity through localized quality control

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts the potential harm of scheduling conflicts into a benefit by using conflict resolution mechanisms that selectively exclude problematic UE candidate sets. This transforms what would be performance-degrading conflicts into a controlled filtering process that improves overall scheduling reliability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS10687348B2Hybrid multiband and subband scheduling in multi-user superposition transmission

Publication Date: 2020.06.16 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

In one aspect, a RAN node determines UE candidate sets for MUST scheduling where each set includes near UE and far UE MUST positions. The node orders the UE candidate sets according to a scheduling performance metric for each UE candidate set, evaluated with respect to the entire band. The node resolves MUST pairing conflicts by excluding, from the UE candidate sets, any UE candidate set that includes a UE that (a) is also present in a UE candidate set having a better scheduling performance metric and (b) has an inconsistent MUST position for interference cancellation with respect to the better UE candidate set, to obtain a reduced set of UE candidate sets. The node performs subband scheduling on each subband, using either MUST or OMA transmission scheduling for each subband. The reduced set is used for MUST scheduling. MUST/OMA subband conflicts may also be resolved.