Carrier Aggregation Primary Carrier Selection for Uplink Power Limits

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Solution Overview

Problem

In wireless communication systems, the use of UTR carriers with uplink transmission power restrictions limits the coverage area and introduces undesirable conditions like increased handovers, especially when carrier aggregation is triggered, as base stations tend to use these carriers as primary carriers despite their limited range and increased interference potential.

Innovation Solution

The base station initiates a handover from a UTR carrier to a UTU carrier when carrier aggregation is triggered, using the UTU carrier as the primary carrier to avoid using UTR carriers and maintain optimal communication range and reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a base station uses a UTR carrier as a primary carrier for carrier aggregation, then carrier aggregation service can be provided, but the coverage area is limited and uplink transmission power is restricted

Engineering Contradiction:

Improvecarrier aggregation serviceVSAvoidcoverage area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The base station changes the carrier type parameter from UTR to UTU by initiating a handover of the UE to a different carrier. This parameter change allows the system to maintain carrier aggregation service while eliminating uplink transmission power restrictions and expanding coverage area.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If a base station uses a UTR carrier as a primary carrier, then carrier aggregation can be triggered, but handover frequency increases due to limited range

Engineering Contradiction:

Improvecarrier aggregationVSAvoidhandover frequency

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The base station changes the carrier type parameter from UTR to UTU through handover, which reduces handover frequency by eliminating the limited range constraint of UTR carriers. This parameter change improves reliability by stabilizing the primary carrier connection.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If a base station uses a UTR carrier for carrier aggregation, then service can be provided, but uplink transmission power is restricted causing interference issues

Engineering Contradiction:

Improvecarrier aggregation serviceVSAvoidinterference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The base station changes the carrier type parameter from UTR to UTU, which removes uplink transmission power restrictions. This parameter change eliminates the harmful interference effect generated by restricted power transmission while maintaining carrier aggregation service.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9699699B1Consideration of carrier characteristics when providing carrier aggregation service

Publication Date: 2017.07.04 SPRINT SPECTRUM LLC

AI summary

In an example method, a base station encounters a trigger to begin providing carrier aggregation service to a UE. The base station is serving the UE on a first carrier, and makes a determination that the first carrier is a carrier having an uplink transmission power restriction rather than a carrier that does not have the uplink transmission power restriction. Responsive to encountering the trigger: based at least on the determination, the base station initiates a handover of the UE from the first carrier to a second carrier that does not have the uplink transmission power restriction; and the base station providing the UE with the carrier aggregation service, using the second carrier as a primary carrier during the carrier aggregation service.