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Shared vs. Assigned Carrier in LTE: Key Differences Explained

This article explores the distinctions between Shared Carriers and Assigned Carriers in the context of LTE (Long-Term Evolution) technology. We’ll examine how these carrier types differ in terms of bandwidth efficiency, network configuration, handover complexity, and more. Let’s dive in!

Shared Carrier vs. Assigned Carrier: A Comparative Overview

In essence, shared carriers involve multiple Radio Access Technologies (RATs), such as GSM and LTE, utilizing the same frequency spectrum. Conversely, assigned carriers dedicate separate frequency carriers to each RAT.

shared carrier

Figure 1: Illustrates the Shared Carrier concept.

The following table summarizes the key differences between shared and assigned carriers:

Features	Shared Carrier	Assigned Carrier
Bandwidth Efficiency	High, carriers of different RATs (e.g., GSM, LTE) utilize the same bandwidth assigned to the telecom operator.	Low, carriers of different RATs utilize separate bandwidth.
Network Configuration	Complex	Simple
Inter-Frequency Handover	Complex (Refer to Inter-RAT Handover)	Simple
Call Establishment	Fast, due to less signaling overhead	Slow
Hardware/Software	Less demanding. It doesn’t typically require additional equipment when moving from one RAT to another.	More demanding.

Real-World Application: VoLTE and Carrier Modes

These carrier concepts play a significant role in LTE, particularly in VoLTE (Voice over LTE) implementations.

Shared Carrier Mode: In this mode, both the VoLTE carrier (for voice) and the data carrier occupy the same frequency spectrum.
Assigned Carrier Mode: Here, two dedicated carriers are assigned, one for VoLTE and the other for data transmission.