MIPI RFFE v3.0 delivers tighter timing precision for 5G

May 14, 2020 //By Julien Happich
MIPI RFFE v3.0
The MIPI Alliance has released the latest version of the world’s de facto standard interface for control of radio frequency (RF) front-end (FE) subsystems, MIPI RFFE v3.0, with the aim to deliver tighter timing precision and reduced latencies for 5G devices.

“The new version of the specification expands its applicability to 5G use cases beyond mobile, such as for automotive, industrial and the Internet of Things (IoT),” said Joel Huloux, chairman of MIPI Alliance. “Development of MIPI RFFE v3.0 was laser focused on satisfying the unprecedented requirements for tight timing precision and low latency in the 3GPP 5G standard today. In this way, the specification helps ensure that manufacturers’ 5G devices deliver the high-performance RF capabilities necessary to enable critical consumer and business features in emerging 5G application spaces.”

MIPI RFFE simplifies the design, configuration and integration of the increasingly complex RF front end—which encompasses the power amplifiers, antenna tuners, filters, low-noise amplifiers (LNAs) and switches—connecting with the modem baseband and/or RF integrated circuit (RFIC) transceiver. As the number of RF bands involved in both uplink and downlink communications has exploded in the rollout of 5G, the subcarrier spacing (SCS) windows among RF packets have narrowed.

MIPI RFFE v3.0 addresses the decreased reconfiguration windows and lower-latency switching among various bands and band combinations demanded in the 3GPP 5G standard by delivering enhanced triggering features and functionality, which results in fast, agile, semi-automated and comprehensive control of individual RFFE subsystems. MIPI RFFE v3.0 utilizes multiple, complementary triggers to synchronize and schedule changes in register settings, either within a slave device or across multiple devices. Timed triggers allow for tighter, synchronized timing control of multiple carrier aggregation configurations. Mappable triggers enable groups of control functions to be remapped to other triggers quickly and easily. Extended triggers boost the number of unique triggers available in the RF control system and accommodates increasingly complex radio architectures.


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