Base Station Signaling for Intermodulation Interference Avoidance

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Solution Overview

Problem

In the 5G NSA scenario, user equipment (UE) experiences intermodulation interference due to the simultaneous maintenance of LTE and NR communication links, which affects data transmission performance.

Innovation Solution

A method and apparatus where a base station determines and sends a signaling to the UE to inquire about its transmission capacity on different frequency bands, allowing the UE to respond with its capabilities, and subsequently configures resources to avoid intermodulation interference by allocating time and frequency resources that do not generate interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If user equipment maintains simultaneous LTE and NR communication links in 5G NSA scenario, then dual connection capability is achieved, but intermodulation interference occurs affecting data transmission performance

Engineering Contradiction:

Improvedual connection capabilityVSAvoidintermodulation interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the parameter of frequency band selection by introducing new signaling to inquire about and indicate supported frequency band combinations. The base station modifies the frequency parameters allocated to UE based on the indicated capabilities, selecting frequency bands that avoid intermodulation interference while maintaining dual connection functionality.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If base station allocates frequency resources without considering UE transmission capacity, then resource allocation is simplified, but intermodulation interference cannot be avoided

Engineering Contradiction:

Improveresource allocation complexityVSAvoidintermodulation interference

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by having the UE pre-indicate its supported frequency band combinations and transmission capacities before actual resource allocation. The base station uses this advance information to proactively select frequency resources that avoid intermodulation interference, rather than dealing with interference problems after allocation.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If user equipment transmits on all available frequency bands, then transmission capacity is maximized, but intermodulation interference increases

Engineering Contradiction:

Improvedata transmission capacityVSAvoidintermodulation interference

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by having different transmission capacities for different frequency band combinations. Instead of uniform transmission across all bands, the UE indicates specific capabilities for specific frequency band combinations, and the base station allocates resources locally optimized for each band combination to avoid intermodulation interference while maintaining overall transmission capacity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11540294B2Method and apparatus for eliminating intermodulation interference, user equipment and base station

Publication Date: 2022.12.27 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

The method for eliminating intermodulation interference includes: determining, by a base station, a second signaling based on a first signaling, wherein the first signaling is a user equipment capability enquiry signaling, and the second signaling carries instruction information instructing a user equipment to send transmission capacity on a combination of different frequency bands; and sending the second signaling.