Holger Hans Peter Freyther wrote:
I am now going to re-write the allocation handling. In terms of operation on the first DL assignment (through the PCH) we can only use a singleslot but when re-using the TBF we might go for multislot. In case the of UL handling we could always try to use multislot assignments. Is this understanding correct?
hi holger,
when i designed multislot allocation algorithm, i considerd the following:
* for one-phase-access (UL), we don't know the multislot class, so i assume class 12, because it allows the maximum RX slots for semi-duplex operation. for two-phase-access we know the multislot class from the PACKET RESOURCE REQUEST. if the BTS provides 4 or more PDCH slots starting with TS1, the algorithm would select TS3 (iirc), because a later (concurrent) DL TBF with class 12 (or other classes) would allow to allocate TS1..TS4, so the phone can still transmit on TS3. the phone would schedule the following 8 bursts for one frame: "-tttt-r--" (t=TX, r=RX) if i would provide an UL TBF with TS1, the phone would be able to do the following scheduling only: "-tt-r---", so the algorithm can only assign TS1 and TS2 for RX. this means that the multislot algorithm must consider the RX slots when choosing a good TX slot, even with no ongoing DL TBF.
* similar to an allocated UL slot, the algorithm must choose the same slot for "control_ts", that is used for polling. even for DL TBF only, the control_ts slot must be allocated as if it would be an UL TS, because the phone must be able to answer, if it is polled. the control_ts and and an assigned UL slot may be the same TS.
* in case of first DL TBF assignment (phone is in packet idle mode), i use multislot algorithm too, because i know the multislot class from the LLC-DATA message. it is no problem to assign a single, but why do you want to assign a single slot here?
best regards,
andreas