Terminal Device LAA Interference Avoidance via Frequency Exclusion

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Solution Overview

Problem

In wireless communication systems, especially when using License Assisted Access (LAA), there is a challenge in avoiding interference between public wireless communication networks and wireless LAN communications, particularly at the cell edge where base stations may not detect wireless LAN communications, leading to potential frequency band overlaps and interference.

Innovation Solution

A terminal device equipped with a communication unit for both public wireless communication and wireless LAN, and a communication control unit that notifies the base station of frequency band exclusion information to avoid interference by selecting non-overlapping frequency bands, ensuring stable LAA communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the base station device detects wireless LAN communication to avoid frequency band overlap, then interference between LAA and wireless LAN is reduced, but the base station device cannot detect wireless LAN communication at cell edge locations

Engineering Contradiction:

Improveinterference between LAA and wireless LANVSAvoiddetection of wireless LAN communication at cell edge

Core Design Contradiction:

Object-affected harmful factorsVSDifficulty of detecting and measuring

Solution Approach 1:

Instead of having the base station detect wireless LAN communications, the terminal device inverts the detection role by actively notifying the base station about detected wireless LAN frequency bands. This allows the base station to avoid allocating overlapping frequencies without requiring the base station to detect wireless LAN signals directly, solving the cell edge detection limitation.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The terminal device acts as an intermediary between wireless LAN communications and the LAA base station. It monitors wireless LAN frequency bands and communicates this information to the base station, enabling the base station to make informed frequency allocation decisions without directly detecting wireless LAN signals.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the terminal device waits to detect interference before changing frequency bands, then handover decisions are based on actual interference conditions, but LAA communication cannot start with lower interference possibility

Engineering Contradiction:

Improvehandover decision accuracyVSAvoidLAA communication start speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The terminal device performs preliminary detection of wireless LAN frequency bands and proactively notifies the base station before LAA communication begins. This allows the base station to allocate non-overlapping frequency bands in advance, enabling LAA communication to start immediately without waiting for interference detection during operation.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10292171B2Terminal device and communication system

Publication Date: 2019.05.14 SHARP KK

AI summary

A terminal device and a communication system which are capable of starting LAA communication with a lower possibility of interference are provided. A communication unit performs communication using each of a first network and a second network. A communication control unit notifies a base station device constituting the first network of allocated frequency band exclusion information indicating a frequency band to be excluded from frequency bands allocated to the terminal device, and controls the communication unit so as to connect to the base station device using a frequency band allocated by the base station device.