PCU sends invalid block number to L1

Minh-Quang Nguyen minh-quang.nguyen at nutaq.com
Mon May 2 13:32:12 UTC 2016

Hi All,


We have noticed that the PCU sends invalid block number to L1 in DSP leading to unexpected message warning in DSP "GsmL1_PhDataReq(1) : Unexpected burst (Invalid blockNumber) [2!=1, SAPI 21-21]]".


After an investigation, we observe that the 'pcu_rx_rts_req' function in pcu_l1_if.cpp receives invalid block number from BTS.

Looking at the BTS side, the calculation of L1SAP_FN2PTCCHBLOCK defined as '#define L1SAP_FN2PTCCHBLOCK(fn) ((fn / 52) & 7)' does not seem to be valid for expected PTCCH block numbers B0, B1,B2,B3 defined in Table 6 in TS 05.02 version 8.11.0.


What do you think about re-define the calculation of the L1SAP_FN2PTCCHBLOCK?  




Minh-Quang Nguyen


Concepteur logiciel  |  Software designer GSM/Network


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