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Post under tag s1ap
Most viewed questions under tag s1ap
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+3
votes
2
answers
Why S1 handover prepapration fails with cause unknown target?
posted
Feb 17, 2015
by
Alkesh Mehta
lte
handover
s1ap
+1
vote
1
answer
LTE: What may be the reason for S1 setup failure ?
posted
May 5, 2014
by
Ganesh Kumar
lte
enodeb
mme
s1ap
+2
votes
3
answers
LTE: When does an eNodeB send "UE Context Release Request" message for an UE to MME ?
posted
Jan 30, 2016
by
Harshita
lte
mme
enodeb
s1ap
+4
votes
2
answers
Why MME UE S1AP ID is needed ?
posted
Nov 17, 2014
by
anonymous
lte
mme
s1ap
+2
votes
1
answer
What MME does when it receives "S1-setup request" from eNodeB with an unknown TAC ?
posted
May 20, 2015
by
Vimal Kumar Mishra
mme
enodeb
s1ap
+1
vote
1
answer
LTE: What target eNodeB does in case it receives "Path switch request failure" from MME ?
posted
Nov 20, 2016
by
Neelam
mme
enodeb
s1ap
handover
+1
vote
1
answer
LTE HO : Why two MME UE S1AP IDs present within the S1-AP HO Request message ?
posted
May 30, 2014
by
Harshita
lte
mme
enodeb
handover
s1ap
+3
votes
1
answer
What MME shall perform when receiving S1 path switch request (changing tac and lac for the UE) after a NAS tau request?
posted
Jul 18, 2015
by
anonymous
lte
mme
s1ap
handover
+3
votes
1
answer
LTE: Why does "CS Fallback Indicator" IE present in UE Context Modification Request ?
posted
Mar 20, 2014
by
Harshita
lte
mme
csfb
s1ap
enodeb
+3
votes
2
answers
LTE: When does an eNodeB send Error Indication message to MME for an UE ?
posted
Jan 28, 2016
by
Harshita
lte
mme
enodeb
s1ap
+1
vote
1
answer
LTE: What eNodeB does after receiving S1 setup response ?
posted
Mar 16, 2014
by
Vimal Kumar Mishra
lte
enodeb
s1ap
mme
+2
votes
1
answer
ERAB modification fail due to radio interface procedure in EnodeB Nokia
posted
Jan 26, 2017
by
Jalloul Bouchkara
lte
enodeb
mme
s1ap
+3
votes
1
answer
What is a difference between S1 AP release and ERAB Release command
posted
Mar 23, 2015
by
anonymous
lte
s1ap
+3
votes
1
answer
Can a eNB belongs to multiple tracking area if the eNB is shared between two operator under e-UTRAN sharing model ?
posted
May 21, 2015
by
Sachidananda Sahu
lte
enodeb
ue
s1ap
+5
votes
2
answers
When does a MME trigger UE context modification procedure towards an eNodeB for an UE ?
posted
Jan 24, 2016
by
Harshita
lte
enodeb
mme
s1ap
+1
vote
0
answers
LTE to 3G IRAT handover fails in preparation phase
posted
Feb 21, 2016
by
Bijit Deb
lte
handover
s1ap
enodeb
mme
+11
votes
2
answers
LTE: In RRC connected mode, when an UE moves from one cell to another cell what messaging happen ?
posted
Feb 7, 2014
by
Vimal Kumar Mishra
lte
mme
enodeb
rrc
s1ap
+3
votes
3
answers
Why NAS-PDU is piggybacked within E-RAB setup request message over the S1-AP interface?
posted
Oct 8, 2014
by
Basabdatta Mukherjee
lte
s1ap
+6
votes
1
answer
LTE: What is the purpose of UE Radio Capability Match procedure ?
posted
Feb 12, 2014
by
Ganesh Kumar
s1ap
enodeb
lte
+2
votes
2
answers
LTE: Why MME does replay of UE Security Capabilities in the Security mode command message ?
posted
Apr 29, 2018
by
Harshita
mme
lte
s1ap
ue
+3
votes
0
answers
SRVCC Sv interface, SRVCC PS to CS Request message contentsSRVCC
posted
Jan 28, 2015
by
Pdk
lte
mme
s1ap
+2
votes
1
answer
Why MME has to send Paging Drx in S1AP paging messge?
posted
Oct 7, 2015
by
Badikela Mahesh
lte
mme
s1ap
paging
0
votes
0
answers
LTE RRC : What is the significance of Cell Traffic Trace procedure ?
posted
Jun 4, 2014
by
Vikram Singh
lte
enodeb
mme
s1ap
+2
votes
0
answers
What are all actions taken by MME, when UE context Modification or E-RAB Modification procedure gets failed ?
posted
Sep 4, 2014
by
Vimal Kumar Mishra
lte
mme
s1ap
enodeb
+3
votes
1
answer
LTE: How does an eNodeB construct ECGI and TAI for an UE while sending messages like "Initial UE message " ?
posted
Feb 29, 2016
by
Vimal Kumar Mishra
lte
mme
enodeb
s1ap
ue
0
votes
2
answers
During S1AP path switch request message, MME releases bearer for QCI 1 with radio network cause 30 and unknown erab id?
posted
Aug 9, 2017
by
anonymous
lte
s1ap
mme
+3
votes
1
answer
How TAU in source eNB interrupts S1 handover (intra MME S1 HO)?
posted
Feb 18, 2015
by
Alkesh Mehta
lte
mme
handover
s1ap
0
votes
2
answers
LTE: What does eNodeB send "RRC establishment cause " in Initial UE message to MME ?
posted
Mar 15, 2016
by
Harshita
lte
interview questions
enodeb
mme
s1ap
+5
votes
0
answers
LTE: Why presence of Tracking Area Identity (TAI) and E-UTRAN CGI (ECGI) IEs is mandatory in Uplink NAS Transport ?
posted
May 16, 2018
by
Vimal Kumar Mishra
lte
mme
enodeb
s1ap
nas
+1
vote
0
answers
When does transfer syntax error come after initial context setup request?
posted
Jan 7, 2016
by
anonymous
lte
mme
ue
s1ap
enodeb
+1
vote
1
answer
LTE: Why MME UE S1AP ID is of length 32 bits and eNodeB UE S1AP ID of length 24 bits only ?
posted
Jul 17, 2018
by
Harshita
lte
interview questions
s1ap
mme
enodeb
+2
votes
2
answers
LTE HO: Is it possible after successful resource allocation at target eNodeB, source eNodeB sends HO Cancel ?
posted
May 30, 2014
by
Harshita
lte
enodeb
handover
mme
s1ap
+1
vote
1
answer
What is the significance of Criticality Diagnostics for S1AP message ?
posted
Oct 8, 2013
by
Neeraj Mishra
lte
enodeb
s1ap
+4
votes
1
answer
What does relay node indicator IE presence in Initial UE message signify ?
posted
Oct 7, 2014
by
Harshita
lte
s1ap
enodeb
mme
+1
vote
0
answers
LTE: Which cause MME sends in s1-setup failure when TAI received in S1-setup request not found at MME ?
posted
May 18, 2018
by
Vimal Kumar Mishra
lte
epc
s1ap
enodeb
mme
+3
votes
2
answers
LTE : What MME will do if handover gets failed ?
posted
Dec 18, 2015
by
Vimal Kumar Mishra
lte
handover
enodeb
ue
s1ap
+5
votes
0
answers
How does presence of "Handover Restriction List" information impact on subsequent handover ?
posted
Mar 30, 2015
by
Harshita
lte
mme
enodeb
s1ap
x2
+2
votes
0
answers
LTE: What is the use of CSFallback indicator in ICS procedure ?
posted
Jan 26, 2014
by
Harshita
lte
mme
enodeb
s1ap
0
votes
1
answer
LTE: What are actions taken at source eNodeB or MME in case of partial resource allocation as part of HO procedure?
posted
May 29, 2014
by
Vimal Kumar Mishra
lte
enodeb
handover
mme
s1ap
+3
votes
3
answers
LTE: What the eNodeB does when there is no target eNodeB is available to handover an UE ?
posted
Jan 30, 2016
by
Vikram Singh
lte
enodeb
mme
s1ap
ue
+4
votes
2
answers
LTE: Does the encoding steps for PLMN vary in case of two and three digits MNC at eNodeB ?
posted
Jun 1, 2018
by
Vimal Kumar Mishra
lte
enodeb
mme
s1ap
+4
votes
1
answer
LTE: What is the significance of eNodeB configuration procedure ?
posted
Nov 15, 2013
by
Neeraj Mishra
lte
enodeb
mme
s1ap
0
votes
2
answers
MME behavior when s1 Setup req is received twice from same eNB
posted
May 16, 2017
by
Sumit Deshmukh
enodeb
lte
mme
s1ap
+1
vote
0
answers
LTE: What MME does after receiving UE capabilities information from the eNodeB for an UE ?
posted
Aug 6, 2016
by
Vikram Singh
lte
mme
s1ap
enodeb
rrc
+3
votes
0
answers
Does UE capability info indication mandatory or optional over S1-AP link ?
posted
Mar 11, 2015
by
Harshita
lte
s1ap
enodeb
mme
+3
votes
1
answer
LTE: What is significance of presence of Correlation ID in ICS request message ?
posted
Jan 26, 2014
by
Harshita
lte
enodeb
mme
s1ap
+1
vote
1
answer
LTE RRC : What may be the purpose of tracing a particular UE in a cell or target cell(s) ?
posted
Jun 5, 2014
by
Vikram Singh
lte
enodeb
rrc
ue
s1ap
+3
votes
3
answers
How mme will react when it didn't receive WRITE-REPLACE WARNING RESPONSE after sending WRITE-REPLACE WARNING REQUEST.
posted
Nov 21, 2015
by
M.chandra Sheker
lte
enodeb
mme
s1ap
rrc
+1
vote
1
answer
LTE: S1AP where can I find the EP CODEs numbering per each procedure
posted
Jan 6, 2016
by
Dannyispark
lte
s1ap
+2
votes
0
answers
LTE: Why "Handover Type" IE is included in both handover messages i.e Handover Required and Handover Request ?
posted
Nov 19, 2016
by
Harshita
lte
mme
enodeb
s1ap
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