Carrier Aggregation (CA) Activation/Deactivation

4G LTE
3

You can find a nice overview here:

Or a full explanation base on 3GPP here:

http://sharetechnote.com/html/LTE_Advanced_MAC.html

3GPP TS 36.321 V11.1.0 section 6.1.3.8 "Activation/Deactivation MAC Control Element…
The eNodeB delivers a MAC CE to activate a configured SCell UL or DL traffic volume.
For DL the eNodeB determine that the CA UE has met the DL traffic:
*Data volume buffered at the RLC>,

  • Delay of the first RLC protocol data unit PDU>
    For UL:
  • The report UL buffer status is greater than the threshold specific;
  • Transmission time interval

For Deactivation

  • Traffic volume <
  • Channel quality
  • Residual block errors
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