In-band Signaling

The goal of in-band signaling in the [[USRP|USRP] is to support precision timing TDMA packet processing and other related items The in-band signaling allows for metadata and control information to be sent on the same channel as the data This information can be used to control the [wikiUSRP USRP]] on a per-packet basis, allowing low-latency transmission control which is needed for detailed Media Access Control (MAC) protocols.

Changes Required

To support in-band signaling, several changes need to be made to the USRP as well as the GNU Radio framework.

USRP Changes

• FPGA: modifications to the receive/transmit chains
• USB FX2 Microcontroller: tweaks to the FX2 firmware

GNU Radio Changes

• m-block: addition of the message-block
• Scheduler: support for quasi-real-time hierarchical scheduler
• USRP Class: modifications to the base USRP class

ScheduleTODO
Profiling Effort