In which scenarios UE will use UE Specific DRX?

Question

How to validate the functionality of C-DRX at eNB side?

Answer 1

Hi mallikarjun,

UE can use UE specific DRX in RRC_IDLE mode and RRC_CONNECTED, If Higher layer configures. But most of the Network wont configure this because Cell specific DRX is enough in RRC_IDLE . But If UE includes UE specific DRX IE in TA update message(refer 3GPP TS 24.008 [13]) or in attach request means MME can over-write the current DRX parameters with UE specific DRX and will send the configuration to the ENb. I don't know exactly when UE will include that IE may be if cell specific DRX is longer means UE can select this option, Even MME itself can configure UE specific DRX in RRC_IDLE mode for S1-AP paging. Some LTE UE device is like health care etc. These app wont use network frequently and network knows exactly when those device will receive data so MME can configure UE specific DRX for these devices instead of cell specific DRX. :) :)

Happy Learning :)