What is LTE Cat1.bis?

LTE Cat-1 bis is a 4G cellular technology designed for IoT devices that need more data throughput than NB-IoT or LTE-M, but do not require the higher speed, cost, and power consumption of LTE Cat-4, LTE-Advanced, or 5G. It sits in the middle of the cellular IoT landscape, offering enough performance for connected devices that need reliable, responsive communication without the complexity of broadband cellular connectivity.

Although LTE Cat-1 bis was introduced as part of 3GPP Release 13, its relevance has grown significantly in recent years. This growth is being driven by the expansion of IoT deployments, the shutdown of 2G and 3G networks, and the need for a practical 4G replacement for legacy machine-to-machine devices. Many IoT applications need more than simple, occasional data transmission, but still do not need the full capabilities of high-speed LTE or 5G. LTE Cat-1 bis fills this gap.

It supports peak data rates of up to 10 Mbps downlink and 5 Mbps uplink, providing far more bandwidth than NB-IoT and LTE-M while remaining less complex than higher LTE categories. This makes it suitable for applications such as smart meters, payment terminals, asset trackers, alarm systems, telematics units, industrial monitoring devices, and equipment that requires firmware updates, location reporting, or frequent two-way communication.

What IoT Devices Need from Cellular Networks

IoT devices are different from smartphones, tablets, and laptops. They are usually built for a specific function, such as tracking an asset, reading a meter, processing a payment, monitoring equipment, sending an alarm, or reporting vehicle data. They are often deployed in large numbers and are expected to operate reliably for years with minimal maintenance.

For these devices, connectivity requirements are not only about maximum speed. Most IoT applications need a balance of data rate, coverage, latency, power consumption, module cost, and network availability. Some devices only need to send a few small packets per day and prioritize long battery life above everything else. Others need more responsive connectivity for firmware updates, payment authorization, location reporting, voice, alarms, diagnostics, or frequent cloud communication.

This is why cellular IoT uses different technologies for different requirements. NB-IoT is optimized for very low data rates, low power consumption, and deep coverage. LTE-M supports low-power mobile IoT devices with moderate data needs. LTE Cat-1 bis sits above both of these in terms of throughput, making it suitable for applications that need more frequent or data-rich communication.

What is LTE Cat-1 bis?

LTE Cat-1 bis is a variant of LTE Cat-1 that was developed for IoT and machine-to-machine applications. Like LTE Cat-1, it supports peak data rates of up to 10 Mbps downlink and 5 Mbps uplink. This places it well above NB-IoT and LTE-M in terms of speed, but below LTE Cat-4, LTE-Advanced, and 5G technologies that are designed for much higher bandwidth applications.

The technology works on existing 4G LTE networks, which is one of its biggest advantages. Device makers do not need to depend on dedicated NB-IoT or LTE-M network availability in every region. Instead, LTE Cat-1 bis can use the broad LTE infrastructure already deployed in most markets. This makes it attractive for global products and large-scale deployments where consistent network availability is important.

A secondary advantage is that LTE Cat-1 bis uses a simpler device architecture than traditional LTE Cat-1. LTE Cat-1 bis requires one receive antenna, compared with the two receive antennas typically used in LTE Cat-1 devices. This can reduce RF complexity, save space, lower component count, and simplify device integration. However, the main reason Cat-1 bis is gaining adoption is not only the antenna design. It is popular because its performance level fits a large class of IoT applications. Qualcomm describes LTE Cat-1 bis as using a single receive antenna and RF chain, making devices easier and less expensive to build in smaller form factors.

Why Cat-1 bis Was Needed

Before LTE Cat-1 bis, device makers had a clear trade-off. LTE Cat-1 provided useful mid-range data rates, but traditional Cat-1 devices typically required two receive antennas, increasing device size and RF complexity. On the other hand, LTE Cat 0, LTE-M, and NB-IoT supported simpler device designs, but offered much lower throughput.

These lower-speed technologies are suitable for many sensor and metering applications, but they are not always enough for devices that need faster data transfer, frequent communication, firmware updates, payment authorization, location reporting, or remote diagnostics. In the IoT market, a large group of devices sits between very low-data sensors and high-speed broadband devices. They need more performance than NB-IoT or LTE-M, but not enough to justify LTE Cat-4 or 5G.

LTE Cat-1 bis was introduced to close this gap. It preserves the Cat-1 performance profile of up to 10 Mbps downlink and 5 Mbps uplink, while allowing a simpler single-receive-antenna design. This gives manufacturers a way to build compact IoT devices with higher data rates than LTE-M or NB-IoT, without moving to the higher cost and power consumption of LTE Cat-4 or 5G.

Where LTE Cat-1 bis Fits in Cellular IoT

LTE Cat-1 bis sits between low-power cellular IoT technologies and higher-speed LTE or 5G options. NB-IoT is designed for devices that send very small amounts of data, such as basic sensors and utility meters. It prioritizes low power consumption and deep coverage over speed. LTE-M offers higher data rates than NB-IoT and is better suited for mobile, battery-powered devices such as wearables and trackers.

LTE Cat-1 bis sits above both technologies in terms of throughput. With peak data rates of up to 10 Mbps downlink and 5 Mbps uplink, it is better suited for devices that need regular communication, faster response times, firmware updates, location reporting, payment authorization, or remote diagnostics.

It does not replace NB-IoT or LTE-M. Instead, it serves a different class of IoT devices that need more data capability while still remaining cost-sensitive. This is why Cat-1 bis is often described as a mid-speed 4G IoT technology: it is not the lowest-power option, and it is not the highest-speed option, but it provides enough performance for a large and growing segment of connected devices.

Why LTE Cat-1 bis is Gaining Momentum

LTE Cat-1 bis has become more relevant as IoT requirements have moved beyond basic, low-data-rate connectivity. Many connected devices now need to transmit more frequent data, support over-the-air updates, process transactions, send location information, or maintain a more responsive connection to cloud platforms. NB-IoT and LTE-M are valuable for low-power applications, but they are not always the best fit for devices that need higher throughput or lower latency.

Another reason for its growth is network availability. Cat-1 bis works on standard 4G LTE networks, while NB-IoT and LTE-M require operator-specific support and are not enabled consistently in every market. This makes Cat-1 bis attractive for global or multi-region products because manufacturers can rely on the existing LTE footprint rather than waiting for dedicated low-power wide-area network deployment.

The shutdown of 2G and 3G networks has also accelerated adoption. Many legacy M2M and IoT devices previously used 2G or 3G modules because they were inexpensive and widely supported. As those networks are retired, Cat-1 bis provides a practical 4G migration path with enough performance for most mid-speed IoT applications.

Market data reflects this shift. IoT Analytics reported that LTE Cat-1 bis shipments grew 49% year-on-year in Q3 2025, continuing the strong growth seen earlier in 2025 as the technology displaces 2G and 3G legacy networks for mid-speed IoT applications. Counterpoint Research also reported that global cellular IoT module shipments grew 15% year-on-year in 2025, driven by 4G Cat-1 bis and 5G.

It is important, however, not to overstate the claim. LTE Cat-1 bis is one of the fastest-growing cellular IoT technologies and a leading option for new 4G IoT module designs. But by total installed cellular IoT connections, NB-IoT remains a leading technology globally. IoT Analytics reported that cellular IoT connections reached 4.7 billion in 2025, with NB-IoT leading, followed by LTE Cat-1 bis and 4G.

Common Applications of LTE Cat-1 bis

LTE Cat-1 bis is used in applications where devices need reliable 4G connectivity, moderate data rates, and the ability to communicate more frequently than basic low-power sensors. Common use cases include asset tracking, smart utility meters, point-of-sale terminals, vehicle telematics, alarm panels, e-mobility systems, parking meters, vending machines, remote diagnostics, industrial equipment monitoring, and connected consumer devices.

In many of these applications, the device needs to send and receive more than a basic status update. A payment terminal may need secure transaction authorization. A telematics unit may need to transmit location, vehicle diagnostics, and event data. An industrial monitor may need to report equipment status frequently and receive configuration updates. A smart meter may need richer data communication than a simple low-data sensor. LTE Cat-1 bis provides enough bandwidth and responsiveness for these use cases without forcing the manufacturer into a higher-cost connectivity category.

The Module Ecosystem is Maturing

The rise of LTE Cat-1 bis is also being supported by improvements in the module ecosystem. Newer Cat-1 bis modules are becoming smaller, more power-efficient, and easier to integrate into IoT products. Many modules are now designed with broader LTE band support, helping manufacturers create devices that can be used across multiple regions with fewer hardware variants.

Modern Cat-1 bis modules may also integrate features such as GNSS, eSIM support, embedded application processing, and common IoT protocols such as MQTT, HTTP, and SSL/TLS. This reduces the need for external components and makes it easier for manufacturers to build complete connected products around a single module.

Power-saving features such as Power Saving Mode and extended Discontinuous Reception have also improved the suitability of Cat-1 bis for battery-powered devices. It is still not as power-optimized as NB-IoT or LTE-M for very small, infrequent transmissions, but it can be efficient for devices that need to wake up, transmit more data quickly, and return to a low-power state.

Limitations of LTE Cat-1 bis

LTE Cat-1 bis is not the best option for every IoT application. Devices that send very small amounts of data and need extremely long battery life may be better served by NB-IoT or LTE-M. These technologies are optimized for low power consumption and deep coverage, making them suitable for sensors, meters, and devices that transmit only occasionally.

At the other end of the spectrum, applications that require high-bandwidth video, broadband connectivity, advanced edge computing, or high-speed mobility may require LTE Cat-4, LTE Cat-6, 5G, or 5G RedCap. Cat-1 bis is designed for moderate-speed IoT, not broadband applications.

There are also radio performance trade-offs. Because Cat-1 bis uses a single receive antenna, it may not provide the same receive diversity as traditional LTE Cat-1 in weak or challenging signal environments. Qualcomm notes that Cat-1 bis can carry an additional 2.5 to 3 dB coverage penalty compared with traditional LTE Cat-1 because of the reduced number of antennas. Good antenna design, module selection, and network coverage remain important for reliable performance.

Future Outlook: Cat-1 bis, RedCap, and eRedCap

LTE Cat-1 bis is likely to remain important for several years because LTE networks are mature, widely deployed, and cost-effective for IoT. It provides a practical 4G solution for mass-market devices that need more capability than NB-IoT or LTE-M but do not require high-speed LTE or 5G.

Over time, some of these use cases may move toward 5G Reduced Capability technologies. 5G RedCap, introduced in 3GPP Release 17, is designed for devices that need lower complexity and lower power consumption than full 5G. eRedCap, introduced in Release 18, is expected to address even lower-cost and lower-complexity use cases closer to today’s mid-speed IoT devices. This does not mean LTE Cat-1 bis will disappear quickly. Instead, it is likely to remain the practical 4G solution for mass-market IoT while RedCap and eRedCap mature, become more widely available, and reach lower module price points.

Conclusion

LTE Cat-1 bis has become important because it fits the practical requirements of modern IoT. It offers more data throughput than NB-IoT and LTE-M, works on existing LTE networks, and provides a lower-cost alternative to higher LTE categories and 5G. For many devices, it delivers exactly the level of performance required: enough speed for regular communication, diagnostics, updates, location data, and transaction handling, without unnecessary broadband capability.

As 2G and 3G networks continue to disappear, LTE Cat-1 bis gives manufacturers a clear 4G migration path for connected devices that need reliable, moderate-speed cellular connectivity. Its popularity comes from this balance. It is not the lowest-power option, and it is not the highest-speed option. It is the practical middle layer of cellular IoT.