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Same as
NeutralState
but with more
restrictions
DLBiased
ULBiased
DynTTIMode
Same as
NeutralState
but with more
restrictions
NeutralState
Yes
RTTI
successful?
Return reservation
No
Yes
BTTI+FANR
successful?
Return reservation
No
Yes
BTTI
successful?
Return reservation
No
Unable to do any reservation
Figure 9.3.2 TBF reservation algorithm in CU
The reservation algorithm first checks which dynamic TTI mode the channel is in. If the
mobile station has RTTI capability it first tries to do a RTTI reservation. To be able to do a
RTTI reservation it needs at least two free R-PDCH timeslots that are located together in the
frame.
RTTI examples:
R
R
B
B
Success
B
R
R
R
R
B
R
Success
B
Unsuccess
B
R
B
R
R
R
Success
R
Unsuccess
B
R
Taken
R
B
B
Unsuccess
Figure 9.3.3 RTTI allocation examples
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