Upload
harish-kumar
View
222
Download
0
Embed Size (px)
Citation preview
8/9/2019 Locating Pre
1/23
Initiation● Switches (on/off)
– SCHO – SDCCH handover – ASSOC - assignment to other cell
– IHO – intra-cell handovers
– IHOSICH - Intra-cell handover on signalling channel
–
IBHOASS - Inter BSC handover dring assignment – IBHOSICH - Inter BSC handover on signalling channel
– !AS"#S$%& – fast moving #S
– CO%'#"S – switch for I$A" (on/off BSC)
– SBHOAC"I*% – is handover with sage of Service Indicatorallowed
● "imers
– "I+I" – inhi,its handovers ntil it e.ires
– "$&%+ – inhi,its handovers ntil it e.ires when in rgenc
8/9/2019 Locating Pre
2/23
#easrements
● $'0%* - signal strength measrement re.orts as integer vales from1 to 23 corres.onds to signal strength of -441 dBm to -56 dBm7
● %+HA+C%D #%AS$%#%+" $%8O$" - element SCA0% is an offsetwhich might add 941 dB to the downlin: signal strength reslting in-411 dBm to -36 dBm7
● $';A0 - integer vale ,etween 1 and 6 where 1 corres.onds togood
8/9/2019 Locating Pre
3/23
Com.ensations
● BS"'8=$ - BS8=$
– BS8=$ – ot.t .ower for BCCH
– BS"'8=$ – ot.t .ower for other fre
8/9/2019 Locating Pre
4/23
!ilters
● SS%*A0SI – filter choice SDCCH
● SS%*A0SD – filter choice "CH
● SS0%+SI and SS0%+SD – filter length for filters ?2-@
● ?4- &eneral !I$ !ilters
– straight average filters with different windows(SACCH .eriods) 2 41 45 4E
● ?2 $ecrsive Straight Average !ilter
– As !I$ ece.t for ,etter com.tational efficienc
(minimal load on the BSC)
8/9/2019 Locating Pre
5/23
!ilters ()
● ?6$ecrsive %.onential !ilter
– recrsive filter with filter coefficient de.endent onSACCH .eriods
– rlev F α rlev 9 (4-α)(ss(t))
● ?E $ecrsive 4st7 Order Btterworth !ilter
– rlev F α rlev 9 (4-α)(ss(t)+ss(t-1))/2
● ?@ #edian !ilter
– median vale from the set last n measrements
● Straight forward average filter for "A
8/9/2019 Locating Pre
6/23
#inimm access re
8/9/2019 Locating Pre
7/23
0ocation ran:ing● %*A0"G8% – 4 or 3
●
%ricsson 4 – #S$'S!! and BS$'S!! thresholds - sfficient signal levels
(to divide cells in - and 0- cells)
– transition hsteresis "$HGS" and a transition offset "$O!!S%" - in cell-to-cell relation
– Signal strength evalation (-criterion)
● offset O!!S%" and hsteresis HGS"
– 8ath loss evalation (0-criterion)
● offset 0O!!S%" and a hsteresis 0HGS"
● %ricsson 3
– HGS"S%8 – when signal strength for serving cell is high or low
– O!!S%" 9 0OHGS" or HIHGS"
8/9/2019 Locating Pre
8/23
High level im.acting featres
● !ast retrn to =CD#A after call release
● !ast retrn to 0"% after call release
● +C after 0"%
● $A"8$IO for cell
● H8$IO H8$IO"H$ 08$IO"H$ – hsteresis andthresholds for .rioritised $A"s
8/9/2019 Locating Pre
9/23
Decisions (.riorit)
● rgenc - timing advance
● Intra-cell for B;
● rgenc - ,ad
8/9/2019 Locating Pre
10/23
rgenc – "iming Advance
● 0imits
– "A0I# for normal cell
– "A0I#'O0 for etended cell ('$A+&% FG%S)
– #A'"A (to
8/9/2019 Locating Pre
11/23
Intra-cell
● !;SS is the
8/9/2019 Locating Pre
12/23
rgenc – ,ad
8/9/2019 Locating Pre
13/23
Assignment to other cell
● ASSOC - on or off
● A= - assignment to a worse cell (on/off)7
● IBHOASS – assignment to other cell inter-BSC(on/off)
●
A=O!!S%" - candidates for Assignment to =orseCell mst ,e stronger than crrent cell decreased, this offset
● CA+D – .ossi,le candidate
– A=+ - not at normal handover7 – +H+ - to ,etter cell and at normal handover
– BO"H - at normal handover
8/9/2019 Locating Pre
14/23
High level im.acting featres
● !ast retrn to =CD#A after call release
● !ast retrn to 0"% after call release
● +C after 0"%
● $A"8$IO for cell
●
H8$IO H8$IO"H$ 08$IO"H$ – hsteresis andthresholds for .rioritised $A"s
8/9/2019 Locating Pre
15/23
HCS● BSC
– 0AG%$ 80AG%$ – HCSBA+D - defines the .riorit for gro. of laers
● Cell
– 0AG%$"H$ 8HCS"H$ - signal strength threshold to ran: cells indifferent laers
– 0AG%$HGS" - hsteresis
– HCSBA+D"H$ - signal strength threshold for HCS ,and criterion
– #A'C%00SI+0AG%$ #A'DBD%*I+0AG%$ - nm,er of cells ofsame laer .rioritied , HCS and ma deviation from ,est one
●
0oad – HCS"$A!DISS"A"% - activate HCS traffic distri,tion
– HCSCHA*AI0"I#%$ - time for chec:ing of idle "CHs
– HCSO" HCSI+ – limits for idle "CH to HO ot or in
8/9/2019 Locating Pre
16/23
!ast moving
● !AS"#S$%& – on/off
● "HO - minimm time that an #S shall remain on ahigher laer cell
● +HO – nm,er of inter-cell handovers within "HO toconsider #S fast moving
8/9/2019 Locating Pre
17/23
O0/0 strctre
● 0O0 - .ath loss threshold (O0)
● "AO0 - timing advance threshold (O0)
● 0OHGS" "AO0HGS" – hsteresis for "A and 80
● D"CBSC – Distance to Cell Border switch (on/of)
●
D"CBSCD"CB - distance (O0)● D"CBHGS" - hsteresis for distance
● +DIS" – additional threshold if neigh,or shold ,eon the BA list
● ++C%00S - nm,er of non-cosited neigh,oring cellsthat mst ,e within +DIS" from D"CB 9 D"CBHGS"of O0 s,cell to trigger a D"CB evalation
8/9/2019 Locating Pre
18/23
O0/0 strctre
● 0O0 - .ath loss threshold (O0)
● "AO0 - timing advance threshold (O0)
● 0OHGS" "AO0HGS" – hsteresis for "A and 80
● D"CBSC – Distance to Cell Border switch (on/of)
●
D"CBSCD"CB - distance (O0)● D"CBHGS" - hsteresis for distance
● +DIS" – additional threshold if neigh,or shold ,eon the BA list
● ++C%00S - nm,er of non-cosited neigh,oring cellsthat mst ,e within +DIS" from D"CB 9 D"CBHGS"of O0 s,cell to trigger a D"CB evalation
8/9/2019 Locating Pre
19/23
8/9/2019 Locating Pre
20/23
8/9/2019 Locating Pre
21/23
Cell 0oad Sharing
● &8$S8$IO on-demand 8DCHs shall ,e treated as
idle or ,s● C0S0%*%0 - .ercentage of idle "CHs – to HO ot
● C0SACC - .ercentage of idle "CHs – for HO in
●
HOC0SACC - incoming handover de to loadsharing (on/off)
● $HGS" - final hsteresis redction
● C0S$A#8 - interval for hsteresis to ,e ram.ed
● C0S"I#%I+"%$*A0- ccle time of the loadmonitoring7
8/9/2019 Locating Pre
22/23
&S#-=CD#A
● CO%'#"S – switch for I$A" (on/off BSC)
● SBHOAC"I*% – is handover with sage of ServiceIndicator allowed
● CO%'#"S0SH – allows reJection of incominghandovers from "$A+ de to load in &S#
● CO%'#"S"I+" – interval for load chec:ing
● ;SI ;SC ;SCI – strateg for measrements inidle/active
●
!DD;#I+ - minimm
8/9/2019 Locating Pre
23/23
&S#-=CD#A HO
● !DD#$$ - K of measred neigh,oring "$A+ cell
in measrement re.orts● ISHO0%* - traffic load threshold of the serving &S#
cell to evalate #"S measrements
● #A'ISHO - defines the maimm nm,er of
allowed handovers to trigger to "$A+ .er second● #$S0 - defines a minimm threshold for the
L