This is a GitHub repository for the Open Test Platform for LTE/LTE-U (short OTP4LTE-U) published by Microsoft. OTP4LTE-U is released as open source, under MIT license.
OTP4LTE-U implements a basic subset of LTE PHY features, as well as the rudimentary MAC, RLC, PDCP and RRC, sufficient to connect a standard LTE dongle. OTP4LTE-U also implements the LTE-U specification and can be used to test LTE-U behaviour and impact on other technologies in 5 GHz spectrum.
OTP4LTE-U is built in Ziria, a domain-specific programming language (DSL) built for programming software-defined radios (SDR). Ziria is relased as open source, and is available on GitHub.
OTP4LTE-U is built for Sora SDR platform. It can also run on BladeRF SDR, although BladeRF currently doesn't support 5 GHz spectrum access.
Check the video demo.
For build instructions please read BUILD
Current directory structure is as follows:
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DnlinkTX: Ziria files implementing all parts of LTE Downlink transmitter
- DnlinkTx/tests: unit tests for DnlinkTX
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UplinkRX: Ziria files implementing all parts of LTE Uplink transmitter
- UplinkRx/PRACH: PRACH-related code
- UplinkRx/tests: unit tests for DnlinkTX
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MAC: C files that wrap Ziria files to compile into a full eNodeB
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eNodeB: Top-level Ziria files implementing eNodeB and scripts to make it.
- Run make here to start eNodeB
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MatlabTests: Various matlab tests that verify Ziria code
- MatlabTests/DnlinkTx: Matlab tests for DnlinkTX
- MatlabTests/DnlinkTx/tests: unit tests for DnlinkTX
- MatlabTests/DnlinkTx: Matlab tests for DnlinkTX
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Perf: Collection of documented performance evaluation results
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LTE-U: LTE-U compliant MAC implementation. See LTE-U README for more information.
- Uplink packet size is currently limited to 8 RBs.
- The receiver decodes uplink packets in every sub-frame, regardless of whether something can be send (depending on whether DCI0 grant was sent)
- DCI0 is sent in subframe 0 of each frame.
- Currently, Dnlink packets are only sent in subframe 4 of each frame (hardcoded in mac_tx_callback() in mac_tx.c)
- Since we don't have a real-time feedback, we sent RAR in every frame It is hardcoded in subframe RAR_SUBFRAME (==6)