Hybrid Automatic Repeat Request (HARQ) in LTE- Part-1

Thanks for watching my Channel ATS.
Hybrid automatic repeat request (hybrid ARQ or HARQ) is a combination of high-rate forward error-correcting coding and ARQ error-control. In standard ARQ, redundant bits are added to data to be transmitted using an error-detecting (ED) code such as a cyclic redundancy check (CRC).
HARQ Process
A little bit different mode of HARQ process is used depending on whether it is for FDD or TDD and whether it is for Uplink and Downlink. But I will talk only about FDD case.
In FDD, we are using 8 HARQ process

i) For Downlink : Asynchronous Process

a) it can use the 8 HARQ processes in any order (Asynchronous Process).

b) UE does not know anything about HARQ process information for DL data before it gets it. So Network send these information (Process ID, RV) in PDCCH (DCI, Refer to DCI section of this site).

ii) For Uplink : Synchronous Process

a)it have to use the specific process in a specific subframe (Synchronous Process). UE has to use the same HARQ process number every 8 subframes.

b) Since UE have to use specific HARQ process ID at specific subframe, the reciever (eNode B) knows exactly which HARQ process comes when. And eNodeB can also knows about RV because UL Grant (DCI 0) from eNodeB can specify RV using MCS field.

c)it has two mode of operation : Adaptive and Non-Adaptive HARQ

I am working in wireless technology where what I learn the same knowledge, technology and technical things shared with you in video format.

Apart from Technology my involvement in creating online money and also learn related to some technical and social things which belong to my Learning Habit, I do not want to keep these things confined to myself.

I would be glad if my video would be a helpful for you.

➽ If any part of the contents of this channel is that your property (as a musician, label, video, image distributor or artist),
please send me a personal message and your content will be removed within 24 hours. PLEASE DO NOT FLAG MY CHANNEL!

☎ Please follow my channel on Social n/w.

Facebook:
  / anandtechnicalsupport  

YouTube
   / @anandtechnosolutions  

Linkedin
========
  / gautamanand4g5g  

Website
=========
https://tweet4technology.blogspot.com/

Facebook Group:
  / anandtechnicalsupport  

☎ CONTACT US: [email protected]

#LTE #HARQ #AnandTechnoSolutions #4G #5G #VOLTE #CSFB #X2HO #S1HO #IMS #DRX #Carrier aggregation #ATS #Tweet4technology #srvcc #throughput #wireless #cloud computing #3G #UMTS #2G #GSM #WCDMA #6G #Attach call flow #Handover
#AnandTechnoSolutions #TechnoSolutions #Technews #Unboxing #Technology
#AnandTechnicalSupport