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How contention resolution happens during RLF procedure?

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How contention resolution happens during RLF procedure?
posted Jan 29 by Jaganathan

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Similar Questions
+1 vote

If the target ENB doesn't have the UE context and no connection between source ENB, then how the packet forwarding happens.
If UE is in AM mode then it might leads to an packet loss during RLF? how to avoid this scenario?

0 votes

Will eNB uses old CRNTI or new temp crnti while responding for reestablishment request in msg3?

+3 votes

Mostly, the MAC control header for contention resolution is of 56-bits(1-byte for DL contention resolution ID+6-bytes for subPdu len of UE-contention resolution id). Please find the below details for your reference.


Source = \Protocol\3GPP\LTE\MAC\Entity Id 17
Destination = \Protocol\3GPP\LTE\PHY\Entity Id 2
Transport Blocks
Transport Block 1 (Codeword 0) Len = 7 =
MAC subheader 1, type: MCE (DL CONTENTION RESOLUTION ID), sub-header length: 1 =
LCID = 28 (DL CONTENTION RESOLUTION ID)
E = 0
R = 0
SubPdu Len = 6
UE Contention Resolution ID = 5E,0E,95,0C,02,C6


Secondly, when does this header if of more than 56-bits as below. 56-bits for contention resolution and 16-bits for padding. Why does the TB1 size is changed?


Source = \Protocol\3GPP\LTE\MAC\Entity Id 17
Destination = \Protocol\3GPP\LTE\PHY\Entity Id 2
Transport Blocks
Transport Block 1 (Codeword 0) Len = 15 =
MAC subheader 1, type: MCE (DL CONTENTION RESOLUTION ID), sub-header length: 1 =
LCID = 28 (DL CONTENTION RESOLUTION ID)
E = 1
R = 0
SubPdu Len = 6
UE Contention Resolution ID = 40,10,00,00,00,16
MAC subheader 2, type: Padding, sub-header length: 1 =
LCID = 31
E = 0
R = 0

+1 vote

If HO fails the UE will initiate contention based reestablishment and connect to some ENB, But target ENB have provided the contention free Rach preamble , at failure case how long ENB will hold this preamble because it has to release for other UE?

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