For nearly two decades, LTE Cat 1 has been the workhorse of the IoT world, reliably bridging the gap between high-speed broadband and low-power wide-area networks. However, as the industry pushes towards more compact, cost-effective, and energy-efficient devices, a streamlined evolution has emerged: LTE Cat 1 bis.

Defined in 3GPP Release 13, Cat 1 bis ("bis" meaning "second" or "evolved" version) maintains the identical 10 Mbps downlink / 5 Mbps uplink speeds of its predecessor but achieves a significant hardware breakthrough by moving from a two-antenna to a single-antenna design.

What are LTE Cat 1 and Cat 1 bis?

To appreciate the evolution, it's essential to understand the foundation.

1.What is LTE Cat 1?

Introduced in 3GPP Release 8, LTE Cat 1 was the first cellular standard purpose-built for the Internet of Things. It was designed to offer a perfect balance for applications needing more bandwidth than 2G or LPWAN technologies could provide, but without the complexity and cost of high-speed LTE categories.

Its key specifications include 10 Mbps downlink and 5 Mbps uplink speeds, sufficient for voice (VoLTE) and basic video streaming. A defining hardware characteristic of traditional Cat 1 is its mandatory requirement for two physical antennas—a primary antenna and a diversity (RX) antenna—to ensure robust reception and link performance.

2.What is LTE Cat 1 bis?

LTE Cat 1 bis, standardized in 3GPP Release 13, is a clever evolution of the Cat 1 standard. It keeps the exact same data rates (10/5 Mbps) and core network compatibility but introduces a critical architectural change: it operates using a single-input single-output (SISO) antenna system, meaning it requires only one antenna.

LTE Cat 1 vs Cat 1 bis: Key Comparison and Differences

1.Antenna Architecture

2.Performance and Coverage

Regarding raw speed, both standards are identical. Both LTE Cat 1 and LTE Cat 1 bis deliver a maximum downlink of 10 Mbps and an uplink of 5 Mbps, and a typical network latency of 50-100 ms. These characteristics make them suitable for real-time applications, VoLTE voice services, and medium-definition video streaming.

However, a gap exists in coverage sensitivity. By removing the diversity antenna, Cat 1 bis suffers a reduction in receiver sensitivity of approximately 2.5 to 3 dB. In technical terms, while Cat 1 offers a maximum coupling loss (MCL) of 144 dB, Cat 1 bis provides 141 dB.

3.Power Consumption and Battery Life

4.Network Availability and Roaming

In terms of infrastructure compatibility, there is virtually no difference between the two. Both standards run directly on existing 4G LTE networks. Mobile operators do not need to perform any special hardware or software upgrades to the base stations or core networks to support them.

5.Ecosystem Maturity and Module Options

Furthermore, industry forecasts predict that by 2030, Cat 1 bis will leverage its unique advantage to potentially capture nearly 95% of new LTE Cat.1 IoT deployments.

LTE Cat 1 vs Cat 1 bis: A Clear Comparison Table

When to Choose Cat 1 vs Cat 1 bis

1.When LTE Cat 1 is Still the Safer Choice

2.When Upgrading to Cat 1 bis Makes Sense

Fibocom: Your Partner in Global LTE Connectivity

Navigating the transition to Cat 1 bis requires a partner with deep technical knowledge and a proven global track record. As a global leader in wireless communication modules and AI solutions, Fibocom offers the expertise required to navigate the transition between LTE standards.

With over two decades of experience in M2M and IoT, Fibocom provides more than just hardware; we offer integrated solutions, including modules, cloud services, and customized PCBA (Printed Circuit Board Assembly) designs.

Fibocom’s global edition LTE Cat.1 bis module LE271-GL delivers cost-effective global 4G connectivity for IoT customers worldwide with four core strengths: ultra-compact size, single-SKU global coverage, low power consumption, and pin-to-pin compatibility. It helps accelerate the global deployment of end devices such as trackers, IPC cameras, new energy devices, and consumer electronics.

By offering such highly integrated and globally certified modules, Fibocom helps enterprise clients scale their IoT projects with confidence, balancing performance, cost, and future-readiness.