ready-to-send at osmo-pcu

Andreas Eversberg andreas at eversberg.eu
Mon Jun 18 17:19:30 UTC 2012


hi,

while reading l1_if.c, i found it usefull to move the ready-to-send-req 
handling to gprs_rlcmac.cpp, because composing of data block (or idle 
blocks) should be done when they are about to be sent and not stored in 
a queue for the following reasons:

- USF can be controlled close to the time when the block is transmitted.
- acknowledged RLC would require that, it can react directly on 
acknowledgements and select the right packet.
- LLC frames can be flushed by SGSN, so transmission stops immediately.
- QoS / control blocks can be scheduled more adequate.

for now, i think it is ok to keep the send-queue, but move it to 
gprs_rlcmac.cpp. later the queue should be obsolete, if segmentation is 
performed "just in time", as well as uplink control. a queue should be 
used for LLC frames _before_ segmentation.

any complains/suggestions? if not, i would provide a patch for that.

regards,

andreas





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