Adaptive Interference Cancellation for 5G SSB Beam Management

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Solution Overview

Problem

In densely deployed 5G New Radio (NR) networks, user equipment (UE) experiences interference and pilot contamination on synchronization signal blocks, which degrades beam management and synchronization performance.

Innovation Solution

A method for adaptive interference cancellation and pilot contamination management, where the UE determines interference and pilot contamination levels to decide whether to apply interference cancellation during beam management and synchronization, using either a 3-symbol or 4-symbol mode based on these levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If interference cancellation is applied for beam management and synchronization, then beam management and synchronization performance is improved, but device complexity and processing overhead increase

Engineering Contradiction:

Improvebeam management and synchronization performanceVSAvoidprocessing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the parameter of interference cancellation application from a fixed state to a dynamically adjustable state based on interference level detection. The system detects interference levels on SSB signals and adaptively switches between applying interference cancellation and not applying it, thereby optimizing the balance between performance improvement and processing complexity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic adaptation mechanisms where the UE can switch between different operational modes (with or without interference cancellation) based on detected interference conditions. This dynamic behavior allows the system to adjust its processing complexity in real-time according to the actual interference environment.

Inventive Principle:

Principle #15Dynamics

2Reliability

If interference cancellation is always applied, then beam management and synchronization performance is improved, but processing overhead and energy consumption increase

Engineering Contradiction:

Improvesynchronization performanceVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies interference cancellation only partially - specifically when and where it is needed. The system detects interference levels and applies interference cancellation only when the detected interference exceeds certain thresholds, rather than continuously applying it. This partial application reduces energy consumption while maintaining sufficient performance in most conditions.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system performs self-assessment of interference conditions and autonomously decides whether interference cancellation is needed. The UE detects interference levels on its own and makes autonomous decisions about applying interference cancellation, eliminating the need for continuous network control signaling and reducing overall system energy consumption.

Inventive Principle:

Principle #25Self-service

3Reliability

If 4-symbol mode is used for beam management and synchronization, then system performance is improved, but vulnerability to pilot contamination increases

Engineering Contradiction:

Improvesystem performanceVSAvoidpilot contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the operational parameter from a fixed 4-symbol mode to an adaptive mode selection between 3-symbol and 4-symbol modes. The system detects pilot contamination levels and switches between modes accordingly, using 3-symbol mode when contamination is detected and 4-symbol mode when it is not, thereby optimizing performance while mitigating contamination effects.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces dynamic mode switching between 3-symbol and 4-symbol configurations based on detected contamination conditions. This dynamic adaptation allows the system to flexibly respond to changing contamination levels in the environment, maintaining optimal performance under varying conditions.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20230216596A1Interference cancellation approach for new radio systems

Publication Date: 2023.07.06 MEDIATEK SINGAPORE PTE LTD

AI summary

A method to perform beam management (BM) and/or synchronization (Sync) with interference cancellation on synchronization signal block (SSB) is proposed. A UE determines interference level and/or pilot contamination level. The UE can then perform BM or Sync, with or without interference cancellation, adapt to the determined interference and pilot contamination level. If interference level is high, UE applies interference cancellation for BM and Sync. If interference level is low, UE does not apply interference cancellation for BM and Sync. If the pilot contamination level is high, then UE follows the 3-symbol mode, e.g., uses only PECH0 SSS, and PBCH2 symbols for BM or Sync. If the pilot contamination level is low, then UE follows the 4-symbol mode, e.g., uses PSS as an extra symbol for BM or Sync to improve system performance.