5G • 5G-Advanced (Rel-18)
eRedCap Half-Duplex FDD
Half-Duplex Frequency Division Duplexing for eRedCap
Operates on paired FDD spectrum without transmitting and receiving at the same time, eliminating expensive high-performance duplexer filters.
Technical Explanation
Full-duplex FDD requires heavy, expensive duplexer filters to isolate simultaneous transmission and reception on paired frequency bands. Rel-18 eRedCap mandates Half-Duplex FDD (HD-FDD) Type A/B, where the terminal switches between transmit and receive modes over time, allowing cheap RF switches to replace bulky ceramic duplexers.
Key Functions
- Eliminates expensive, bulky ceramic duplexer filters from device RF front-ends
- Switches dynamically between transmit and receive time slots in paired FDD bands
- Lowers module hardware costs and shrinks physical enclosure dimensions
- Enables global deployment across fragmented international paired spectrum bands
Specifications
3GPP TS 38.211, TS 38.306 (Rel-18)
Interfaces
Uu (HD-FDD)
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