Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated
https://osmocom.org/projects/osmopcu
0eabffdc35
Currently the DL blocks are scheduled round robin to each TBF that is either in state FLOW or FINISHED and not waiting for an IMM.ASS confirmation. This way, if single blocks has been NACK'ed by the MS and the PCU has already resent the missing packets, the PCU starts retransmitting them until it has received an ACK/NACK even if other TBF have RLC blocks that need to be transmitted. This commit changes sched_select_downlink to select the next TBF with the highest priority, where blocks that are going to be resent again have a lower priority unless the window is stalling. If there is only one TBF the old behaviour is kept, since there is no other TBF that can have a higher priority. If there is much packet loss on a single phone, this modification can lead to a higher latency for that MS. Sponsored-by: On-Waves ehf |
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| README | ||
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| configure.ac | ||
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| osmoappdesc.py | ||
README
This is an implementation of Packet Control Unit (PCU) according to TS 04.60 The PCU is part of BSS, so it connects directly to SGSN. == Current limitations == * No PFC support * No fixed allocation support * No extended dynamic allocation support * No unacknowledged mode operation * No PCCCH/PBCCH support * Only single slot assignment on uplink direction * No half-duplex class support (only semi-duplex) * No handover support * No measurement support * No TA loop * No power loop * No CS loop * No EGPRS