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LTE and 5G NR RACH difference

+3 votes
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what is the main difference between LTE and 5G NR RACH ?

posted Jan 11, 2018 by Dhianesh

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1 Answer

+1 vote

In LTE and 5G-NR, signalling messages exchange are same except initial differences before UE starts with RACH procedure.
In LTE, cell synchronization happens first and then after UE starts with RACH procedure. When 5G NR would be operating in beam forming mode, UE need to detect and select the best beam before initiating the RACH procedure. This is the only difference that I know.

answer Jan 15, 2018 by Harshita
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+2 votes
5G: Can someone please explain RRC connection in 5G NR ? Is there any difference in 5G NR compare to 4G LTE ?

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+1 vote
RACH initiation in 5g NR

38.300 says below
- Initial access from RRC_IDLE;
- RRC Connection Re-establishment procedure;
- DL or UL data arrival during RRC_CONNECTED when UL synchronisation status is "non-synchronised";
- UL data arrival during RRC_CONNECTED when there are no PUCCH resources for SR available;
- SR failure;
- Request by RRC upon synchronous reconfiguration (e.g. handover);
- Transition from RRC_INACTIVE;
- To establish time alignment for a secondary TAG;
- Request for Other SI (see clause 7.3);
- Beam failure recovery;
- Consistent UL LBT failure on SpCell.

Can someone explain about
DL or UL data arrival during RRC_CONNECTED when UL synchronisation status is "non-synchronised";

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