VoLTE Drop Analysis and Troublehsooting_V1

VoLTE from RF/RAN

 Topics  Topics

1. VoLTE oLTE general general Architectu Architecture re . !M" egistr egistrati ation on $o% $o% &. VoLTE oLTE Call Call 'lo% 'lo% (. La)er *&+ ,CA,+ CL-+ C"L / e0 Trace Trace anal)sis 2or a VoLT VoLTe Drop 3. VoL oLTE TE Muting Muting Anal) Anal)sis sis

IMS Architecture and elements

,ro4) C"C' 5,*C"C'6 "erving C"C' 5"*C"C'6 !nterrogating !nterrogating C"C' 5!*C"C'6 Media ate%a) Control 'unction 'unction 5MC'6 rea7out ate%a) Control 'unction 5C'6

IMS Registration

Voice Drop

Voice Drop!"A! Dro p!"A! Failure ISA Log during Dropped "all

)e Cause9 "ervice :ased local polic) 2unction a:orted session

"1A, Cause9 ;nspecifed

Voice DropLa#er$ Signalling

RRE Re%ection

A&normal Signaling 'ith triggering of "ontention &ased RA"( !rocedure VoLTE Drop

Voice Drop eN) Trace

RR" Release "ause* +thers No RR" Reesta&lishment re,uest from -E EN) as seen from -E Log 