OpenBTS ToDo list¶

List below names features missing in the open-source version of OpenBTS and OpenBTS-UHD. We invite you to volunteer and implement them!

Please send all patches to the openbts-discuss mailing list

This list relates to the OpenBTS features available in freely available versions of OpenBTS. Contact David Burgess with questions about commercial/proprietary OpenBTS version available from RangeNetworks.

(List is unsorted)

• More documentation and tutorials

• Check OpenBTS against the standard conformance tests.

• Wider support of audio codecs (only Full-Rate is supported right now)
  1. EFR - Enhanced Full-Rate. Good part of the work is already done by Sylvain Munaut in Airprobe.
  2. HR - Half-Rate. Requires implementation of TCH/H logical channel as well.
  3. AMR - Adaptive Multi-Rate. Including code for the codec bitrate adaptation.

• Authentication support

• Encryption support
  1. A5/1
  2. A5/2
  3. A5/3

• Better HLR (Home Location Register)
  1. SQL-based
  2. Integration with traditional GSM HLRs

• Data transfer services support
  1. GPRS
  2. EGPRS aka EDGE
  3. CSD

• Embedded systems optimization (ARM, MIPS, etc)
  1. DSP optimizations - transceiver is very computationally intensive
  2. Memory usage optimizations - we need to eliminate many malloc/free calls
  3. General architecture optimizations - e.g. get rid of many threads

• Multi-ARFCN (>7 voice channels per transceiver)
  1. DSP code for multi-channel Rx and Tx
  2. L2-L3 code for multi-channel support

• Space diversity receive (using two antennas to improve coverage)
  1. Switching
  2. Combining

• Handover support
  1. GSM-side handover support
  2. SIP-side handover support

• Standard configurations samples
  1. Single multi-sector installation
  2. Multiple towers
  3. Advanced call-service features

• Support DTX (Discontinuous transmission).

• USSD improvement and integration with external services

• Integration with 3G/IMS core network

• Internal command-line interface (CLI) improvement

• Better RRLP support

• Logging facility improvement

• Web-interface for configuration, control and monitoring of OpenBTS