Its main features are:
Pradeep 10 Comments Just thought of writing a small note on how aggregation level controls PDCCH decoding and its importance in a wireless channel. As we saw from the previous section, the number of bits that can be accommodated are different in each of the aggregation levels and as we know the number of bits in each of the DCI formats are less than the number of bits shown above.
Lets take a example of DCI format 1A for 10Mhz, the total number of bits after packing all the fields will be 25 and after adding the 16 bit CRC, this will add upto 41 bits. Now the scheduler will have to decide, which aggregation to be used for a DCI format and it takes that decision based on following factors, Worst case scenario — this factor is considered for all the common DCIs such as SIB, RAR, Paging etc and the reason for assuming the worst case is, these DCIs are supposed to be decoded by all the UEs connected to the eNodeB, no matter how far or near they are to the eNodeB, hence most likely the scheduler will use the highest possible aggregation level of 8 to schedule these DCIs, so for the above example of DCI 1A, the 41 bits are rate matched and bloated to bits giving a very good forward error correction protection for these bits.
The answer is capacity. Higher the aggregation level, more number of subcarriers are required for a given user, hence reducing the amount of space available in the control channel for other UE DCIs, which in turn will control how many users the scheduler will be able to schedule in the given subframe.
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