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• Allocation may be Dynamic - single TTI or Semi-persistent (periodically repeating)
• UE is sent a bitmap to assign the downlink Resource Blocks in the same TTI
– Direct bitmap - each bit assigns one resource block
– Bitmap type 0 - assigns Resource Block Groups (sets of consecutive Resource Blocks)
– Bitmap type 1 - assigns individual resource blocks (for frequency diversity) from the Resource Block Groups
– Bitmap type 2 - several sets of contiguous blocks (no segmentation of band into Resource Block Groups)

Semi-persistent allocation of Resource Blocks is useful for real-time applications such as VoIP where the transfer of data is constant and repetitive.
The semi-persistent allocation is provided to the mobile’s C-RNTI so if the mobile does not see any further allocation, it may use this repetitive allocation.
If it does see an allocation to its C-RNTI, this takes precedence.
The direct bitmap is only used for up to 10 resource blocks (10 bits) otherwise the bitmap size would become too large.
Assignments are usually made which cover transmissions in both halves of the subframe, but it is also possible to have separate assignments for each half of the subframe.