5G • 5G-Advanced (Rel-18)
SBFD In-Band Relay
Integrated Access and Backhaul (IAB) Full Duplex Relaying
Applies SBFD self-interference cancellation to IAB relay nodes, allowing simultaneous wireless backhaul reception and mobile access transmission on the same carrier.
Technical Explanation
Legacy Integrated Access and Backhaul (IAB) nodes in Rel-16/17 must alternate between communicating with the parent donor base station (backhaul) and serving local mobile users (access), cutting effective throughput in half. SBFD IAB relays employ self-interference cancellation to backhaul and serve users simultaneously, doubling relay spectral efficiency.
Key Functions
- Enables simultaneous wireless backhaul and user access on a single carrier frequency
- Doubles the throughput efficiency of Integrated Access and Backhaul (IAB) nodes
- Eliminates half-duplex scheduling bottlenecks across multi-hop relay topologies
- Significantly reduces fiber rollout costs in dense urban millimeter wave extensions
Specifications
3GPP TR 38.858, TS 38.401 (Rel-18)
Interfaces
UuF1* (IAB)
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