Why LTE Cat 1 Became the "Golden Choice" After 2G/3G SunsetOne of the biggest changes in the IoT industry over the past few years has been the accelerated sunsetting of 2G and 3G networks. A large number of devices that originally ran on 2G/3G—POS terminals, shared bikes, smart meters, vehicle terminals—have had to find new connectivity solutions. The options seem plentiful: NB-IoT offers low power consumption and low cost, but its speed is too slow and it doesn't support voice. Cat 4 is fast, but its power consumption and cost are relatively high—many scenarios don't need that much bandwidth. This gap in the middle is exactly where LTE Cat 1 comes in. 01 What Exactly Is Cat 1?LTE Cat 1 is an LTE terminal capability level defined by 3GPP in Release 8, and it's the lowest tier in the LTE family. Its core parameters are as follows:
Looking at the speed alone—10 Mbps downlink, 5 Mbps uplink—it does seem "neither high nor low" in the smartphone era. But in IoT scenarios, this speed hits a critical sweet spot: sufficient for standard-definition video, real-time data transmission, and voice calls, without requiring Cat 4's complex RF circuitry and high power consumption. 02 Why Cat 1, Not NB-IoT or Cat 4?Comparing Cat 1 with several mainstream IoT communication technologies makes its positioning clear. NB-IoT's downlink rate is about 200 kbps, latency is as high as 400ms, it doesn't support voice, and its mobility is weak. It suits static, low-speed, low-power scenarios like water and gas meters. But once a device needs mobility, voice, or slightly faster data transmission, NB-IoT falls short. Cat 4's downlink rate is 150 Mbps with 5-20ms latency—strong performance, but module prices are 150-200 yuan and power consumption is noticeably higher. For devices that only need to transmit small amounts of data while requiring mobility and voice, Cat 4 is overkill. Cat 1 fills the gap between the two: 10 Mbps downlink, 5 Mbps uplink, 8-50ms latency, VoLTE support, and mobility above 100 km/h, with module prices around 50-100 yuan—40%-60% lower than Cat 4. There's also an easily overlooked factor: network coverage. Cat 1 relies on the globally mature 4G LTE network, requiring no new base stations and directly leveraging existing 4G infrastructure. This means its coverage spans cities, rural areas, and remote regions, with low deployment costs and fast implementation. 03 Power Consumption, Packaging, and Industry EcosystemCat 1's power consumption is about 30%-40% lower than Cat 4, supporting PSM (Power Saving Mode) and eDRX (Extended Discontinuous Reception), suitable for battery-powered scenarios. The wide voltage design (3.4V-4.2V) adapts to various power solutions, and a hardware watchdog ensures long-term stable operation. At the packaging level, many Cat 1 modules are compatible with older models' footprint dimensions, supporting seamless upgrades from 2G/3G modules. For existing device retrofits, this means no motherboard redesign is needed—simply replacing the module completes the connectivity upgrade. On the cost side, with large-scale adoption, Cat 1 module prices have dropped from over 200 yuan in the early days to the 50-100 yuan range, with some entry-level products below 50 yuan. Across the industry chain, manufacturers including Quectel, Fibocom, China Mobile IoT, and Luat have all released multiple Cat 1 modules, and the ecosystem is maturing. 04 Typical Application ScenariosCat 1's applicable scenarios cluster around the intersection of three requirements: "needs mid-speed, needs mobility, needs voice." Payment terminals are the most typical scenario. POS terminals and barcode scanners need stable connectivity and real-time transactions, and some require voice broadcast functions. Cat 1 perfectly matches these needs and has become the mainstream choice in the payment terminal market. The sharing economy also depends on Cat 1's capabilities. Shared bikes and shared power banks need to maintain connectivity while moving, uploading location and status data in real time. Cat 1 supports speeds above 100 km/h, meeting these requirements. Wearable devices such as smartwatches and fitness bands need low power consumption, voice calling, and positioning. Cat 1 strikes a good balance between power consumption and functionality, making it a suitable choice for these devices. Intelligent transportation—vehicle navigation, ETC, and connected vehicle terminals—has clear requirements for mobility and real-time data transmission. Cat 1 performs stably in these scenarios. Smart energy—charging piles, smart electricity meters, water meters, gas meters—needs stable connectivity and remote control. Compared to NB-IoT, Cat 1 supports faster parameter configuration and command delivery, offering advantages in energy scenarios requiring real-time response. 05 Key Considerations for Module SelectionSeveral dimensions deserve attention when selecting Cat 1 modules. Band coverage: Domestic projects should confirm the module supports the full-network bands of China's three major carriers (FDD B1/B3/B5/B8, TDD B34/B38/B39/B40/B41). Export projects need to verify the target market's band requirements. Packaging compatibility: If upgrading from 2G/3G modules, prioritize footprint-compatible models to avoid motherboard redesign and reduce retrofit difficulty and cost. Protocol support: Confirm whether the module's built-in network protocol stack meets project requirements. Mainstream modules typically support TCP/IP, MQTT, CoAP, and other protocols, with some supporting industrial protocols like Modbus-TCP—choose based on on-site device types. Power consumption and operating temperature: Battery-powered devices need to check PSM and eDRX support, while industrial scenarios need to confirm the operating temperature range meets on-site environmental requirements. Taking MovingComm's ComIoT series 4G modules as an example, the ComIoT 23 is a 4G Cat 4 industrial core module designed for device networking and industrial routing scenarios; for projects requiring mid-speed and low power consumption, the Cat 1 solution's suitability can be evaluated based on specific scenarios. The key to selection lies in matching the appropriate tier of product to the project's actual speed requirements, power constraints, and deployment environment. 06 ConclusionCat 1's rise is essentially the result of the IoT industry returning from "chasing high speeds" to "matching real needs." It doesn't pursue leadership in specifications—it happens to sit precisely at the intersection of mid-speed, mobility, and voice support. As 5G networks proliferate, Cat 1 will complement 5G RedCap, continuing to play a role in the mid-to-low-speed IoT market. For engineering professionals advancing 2G/3G sunset replacement projects, understanding Cat 1's positioning and boundaries is more valuable than memorizing any specific parameter. |
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