Energy Saving Techniques for UE in 5G: RRC States, DRX, and CDRX

In 5G, UE sleeps when there is no data traffic, and wakes up when data arrives in downlink or uplink buffer. This video explains the basics of sleep and wake-up mechanisms using RRC states, DRX, and CDRX.
▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
0:00 - Introduction
0:18 - RRC States
1:31 - Discontinuous Reception (DRX)
1:35 - Initiating downlink data transmission
3:12 - Initiating uplink data transmission
3:57 - Connected Mode Discontinuous Reception (CDRX)
4:45 - DRX Short Cycle and Long Cycle
5:44 - Event based wake up period extension
References:
1. ETSI TS 138 331, Section 6.3.2
2. ETSI TS 138 304
3. Book: Chris Johnson, "5G New Radio in Bullets", 2019.
4. 5G NR: Connected Mode DRX (howltestuffworks.blogspot.com/...)
5. Sharetechnote: 4G/LTE - DRX (www.sharetechnote.com/html/Ha...)
Music: Erik SATIE - Gymnopedies 1
#5G, #Wireless, #WirelessCommunication, #CellularCommunication, #DRX, #CDRX, #rrcgroupd
"Correction: 03:31 UE cannot send SR while in RRC idle/inactive state. To change to 'RRC Connected' state, UE has to do a contention-based RACH procedure."

[@anuragchakra]

Amazing ultimate explnation brother loved it ❤❤...Many thanks for your amazing content

[@ravindratomar9916]

very well explained. Thank you.

[@user-yn3ww1fu6f]

Great Explanation :)

[@pitmaler4439]

great thanks

[@nhlalo5446]

Thank you

[@user-eq1qk6sk7v]

best explaination ever.

[@alokshastri1920]

nice video

[@ravindratomar9916]

Please make a video on 5G SA call flow, if possible.

[@user-vo4df8pc7x]

Why UE can send the scheduling request at RCC idle/inactive state?
I can't find any resource about it.

[@WirelessExplained]

Agree. UE cannot send SR in RRC idle/inactive state. To change to 'RRC Connected' state, UE has to do a contention-based RACH procedure. I have added this correction in the description. Thanks a lot for pointing this error 🙂

[@TheAbrunqaj]

Thanks for this video. Does the UE/NW have to choose which power saving method to use or it can use both RRC inactive state and DRX ? If both then how would that go about ?

[@WirelessExplained]

If a UE is in RRC Inactive/Idle state, it is by default in DRX cycle. Otherwise, UE cannot listen to paging signals.
Network decides RRC-state and power-saving method of the UE.

[@ravindratomar9916]

very well explained. Thank you.

[@WirelessExplained]

Thanks!