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Bug #4966

Updated by pespin about 3 years ago

DUring GPRS+EGPRS multiplexing on a PDCH, if a GPRS-only phone is using the PDCH, there a re some constraints that must be followed by the PCU scheduler so that they are able to receive the DL blocks. That is namely: 
 * At least 1 GMSK block must be sent every 18th block 
 * If USF targes the GPRS-only phone, GMSK must be used 

 That means, for instance, when the scheduler looks for a GMSK DL block candidate to sent (due to above restrictions), it skips selecting DL blocks for TBFs which are waiting for retransmission of 8PSK blocks (MCS>4), meaning it may end up sending a Dummy Block sometimes. 

 Under that circumstances, we should do a 2nd pass over the TBFs and downgrade the ready-to-be-transmitted 8PSK DL block to a MCS of the same family which is MCS <= => 4), that is, in practice, splitting the data in 2 blocks containing same BSN but different SPB to identify first/second subblocks.

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