5G • 5G-Advanced (Rel-18)
5 MHz Channel Bandwidth
eRedCap Narrowband 5 MHz RF Operating Bandwidth
Limits device RF transceiver filters to 5 MHz, allowing cheap analog front-ends and baseband processors while coexisting on wideband 100 MHz gNB carriers.
Technical Explanation
In Rel-18 eRedCap, user devices are constrained to a 5 MHz operating bandwidth (equivalent to 25 resource blocks at 15 kHz subcarrier spacing). The gNodeB schedules eRedCap devices inside designated narrow Bandwidth Parts (BWPs) embedded within its full 100 MHz carrier, allowing high-speed smartphones and cheap IoT devices to share the exact same radio carrier.
Key Functions
- Restricts device receiver and transmitter front-end bandwidth to 5 MHz
- Reduces ADC/DAC sampling clock speeds, drastically decreasing idle power consumption
- Embeds within standard wideband commercial 5G carriers via specialized Bandwidth Parts
- Coexists seamlessly with full-capability 5G smartphones without spectral fragmentation
Specifications
3GPP TS 38.101-1, TS 38.211 (Rel-18)
Interfaces
Uu (BWP)
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