Cellular Network Infrastructure » Radio Access Network » OsmoPCU

**There seems to be an increased number of poll timeouts if TBFs share a single PDCH in comparison to completely separated TBFs (no common PDCH). Interestingly there haven't been any SBA timeouts (at least I did not see any in the statistics I have looked at so far).

The MS recover without problems, at least when using 2 MS only. This might be different with a large number of MS and an increased probability for collisions.

It might be a frame usage/allocation issue, e.g. 2 MS sending frames simultaneously.

More testing and analysis is needed.

Osmo-PCU> show bts statistics
BTS Statistics:
 TBF DL Allocated     :       13 (0/s 0/m 0/h 0/d)
 TBF DL Freed         :       12 (0/s 0/m 0/h 0/d)
 TBF UL Allocated     :      363 (0/s 0/m 0/h 0/d)
 TBF UL Freed         :      363 (0/s 0/m 0/h 0/d)
 TBF Reused           :        1 (0/s 0/m 0/h 0/d)
 RLC Sent             :    36706 (0/s 0/m 0/h 0/d)
 RLC Resent           :    10385 (0/s 0/m 0/h 0/d)
 RLC Restarted        :     4304 (0/s 0/m 0/h 0/d)
 RLC Stalled          :       93 (0/s 0/m 0/h 0/d)
 RLC Nacked           :       40 (0/s 0/m 0/h 0/d)
 RLC Assign Timeout   :        8 (0/s 0/m 0/h 0/d) <<<
 RLC Ack Timeout      :       63 (0/s 0/m 0/h 0/d) <<< 
 RLC Release Timeout  :        0 (0/s 0/m 0/h 0/d)
 Decode Errors        :        0 (0/s 0/m 0/h 0/d)
 SBA Allocated        :        8 (0/s 0/m 0/h 0/d)
 SBA Freed            :        8 (0/s 0/m 0/h 0/d)
 SBA Timeout          :        0 (0/s 0/m 0/h 0/d) <<<
 Timedout Frames      :        3 (0/s 0/m 0/h 0/d)
 Dropped Frames       :        3 (0/s 0/m 0/h 0/d)
 Scheduled Frames     :     2782 (0/s 0/m 0/h 0/d)
 RACH requests        :        8 (0/s 0/m 0/h 0/d)