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nanoBTS Product Description Software Specification
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The BTS supports the "Directed Retry" procedure on a particular MS to produce a list of
candidate NCELLs that it can be handed over to.
5.6.3 Cell Broadcast
The BTS supports the "SMS-CB Default" message
The BTS supports the "SMS-CB Normal" message
The BTS does not support the "SMS-CB Scheduled" message
The BTS does not support the CBCH Flow control. The BTS sends an 08.58 ErrorInd upon
receipt and throws a warning level FER (see section 5.7).
5.6.4 CCCH
The BTS supports Paging Re-organise and shall autonomously detect this by monitoring
the System Information.
CCCH load management is supported via configurable Load Indication Period and
Threshold attributes.
RACH load management is not supported.
Paging messages are repeated with configurable "Repeat Count" and "Repeat Period".
Paging repeats do not automatically terminate on receipt of the SABM.
5.6.5 System Information
The BTS transmits System Information (SI) messages as part of the BCCH channel (as
defined in GSM 04.08 and 05.02).
The BTS supports SI 1, 2, 2bis, 2ter, 3, 4, 5, 5bis, 5ter, 6 (on SACCH), 7, 8, 13
The BTS does not support SI 9, 10, 16, 17.
All other System Information messages are not supported.
5.7 Error Handling
All software errors generate a "Failure Event Report" (FER) with manufacturer specific
"Probable Cause". SW warnings include module and line number in the "Additional Text"
IE’s.
The BTS supports SNMP traps for all errors. Within the SNMP MIB there will be an entry of
"last reported error".
There is a HW watchdog shall reset the system in case of unhandled errors.
Fatal Software errors store the error code in memory, and send a FER after reboot.
The BTS keeps a log of the last 10 SW and the last 10 HW errors in EEPROM including
time and date of occurrence.
The BTS supports the GSM 12.21 (Version 5) "Request Outstanding Errors" procedure so
that a BSC can list the state of all possible faults.
The BTS detects the loss of Ethernet connection by sending "keep-alive pings".