Prioritized IDC Indication for UE Throughput and Spectrum Efficiency

Solution Overview

Problem

In-device coexistence (IDC) interference between multiple radio transceivers in wireless communication devices, such as LTE, WiFi, and Bluetooth, leads to significant performance degradation due to overlapping or adjacent radio spectrums, with existing solutions like FDM and TDM having limitations in maintaining throughput and spectrum efficiency.

Innovation Solution

A user equipment (UE) prioritizes Frequency Division Multiplexing (FDM)-based solutions for IDC indication message generation, continuously requesting FDM-based solutions even if Time Division Multiplexing (TDM)-based solutions are received, to mitigate throughput impact and maintain performance, by sending IDC messages to the network and alternating between FDM and TDM options.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If TDM-based solution is applied for IDC interference mitigation, then spectrum efficiency is improved, but UE throughput performance deteriorates due to time-sharing between radios

Engineering Contradiction:

Improvespectrum efficiencyVSAvoidUE throughput

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent implements dynamic switching between FDM and TDM solutions based on network response and interference conditions. The UE alternates between requesting FDM-based solutions (which maintain throughput) and TDM-based solutions (which provide spectrum efficiency) depending on whether the network responds to IDC indication messages, thereby dynamically optimizing the trade-off between spectrum efficiency and throughput performance

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the IDC indication message parameters by alternating between different solution types (FDM vs TDM) in subsequent messages. When the network does not respond to an FDM request, the UE modifies its approach by sending alternative IDC indication messages that may result in TDM-based solutions, thus adapting the solution parameters based on network behavior

Inventive Principle:

Principle #35Parameter changes

2Productivity

If FDM-based solution is applied for IDC interference mitigation, then UE throughput performance is maintained, but LTE spectrum efficiency deteriorates due to possible spectrum waste

Engineering Contradiction:

ImproveUE throughputVSAvoidspectrum efficiency

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent implements dynamic switching between FDM and TDM solutions based on network response and interference conditions. The UE alternates between requesting FDM-based solutions (which maintain throughput) and TDM-based solutions (which provide spectrum efficiency) depending on whether the network responds to IDC indication messages, thereby dynamically optimizing the trade-off between spectrum efficiency and throughput performance

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies FDM-based solutions preferentially and continuously requests FDM solutions even after receiving TDM-based solutions, accepting some spectrum waste as a partial action to maintain UE throughput performance. This excessive preference for FDM ensures throughput maintenance while the network ultimately controls the actual resource allocation

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10091793B2Prioritized generation of IDC indication message to mitigate IDC impact on UE performance

Publication Date: 2018.10.02 MEDIATEK INC

AI summary

A UE controls in-device coexistence (IDC) indication message generation to mitigate potential throughput impact on UE to maintain UE performance as much as possible. Under the proposed method, FDM-based solution is always preferred by the UE. Based on the IDC indication message generated by the UE, a network applies an IDC interference mitigation solution that prioritizes FDM-based solution. Specifically, the UE first sends an IDC message requesting FDM-based solution. In case the serving eNB does not respond, the UE sends a new IDC message by alternating IDC option. Even if a TDM-based solution has been received, the UE may continue requesting FDM-based solution to gain UE performance.