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8/10/2019 WS Prague Power Control
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RADIOMOBIL WORKSHOP
Power Control Process
April 1014, 2000
Prague
8/10/2019 WS Prague Power Control
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering2April 2000
Overview
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering3April 2000
Effect of Power Control
Power Co nt ro l Box
0
5 0 0
1 0 0 0
1 5 0 0
2 0 0 0
2 5 0 0
1 5 91
3
1
7
2
1
2
5
2
9
3
3
3
7
4
1
4
5
4
9
5
3
5
7
6
1
6
5
6
9
7
3
7
7
8
1
8
5
8
9
9
3
9
7
1
0
1
1
0
5
R X L E V
M
R
ul_ rxle v ul_ rxlev_ PC
effective reduction in power
due to powe r contro l
P owe r B ox
Power Box
Effective reduction
in power due to PC
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering4April 2000
MS / BSS Power Control
UL & DL Measu rements Taken
Averages Produced
A Number of Averages Compared Against Threshold
Thresho ld Exceeded
Power Output Adjusted
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering5April 2000
Power Control due to Level
MS & BTS power control shares the same averagingresult
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering6April 2000
Power Control due to Quality
MS & BTS power control shares the same averagingresult
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering7April 2000
Standard Power Control
decision_alg_num = 0 bts_p_con_ack and ms_p_con_ack timers are not used.
decision_alg_num = 1
bts_p_con_ack and ms_p_con_ack timers are used.
Quality takes precedence!
RxQual >l_rxqual_ul_h
&
RxLev > u_rxlev_ul_p
Decisio n_alg_number = 1INCREASE
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering8April 2000
Power Control Parameters (1)
Tim ing ...
p_con_interval p_con_interval
Command Acknow ledged Command Not Acknow ledged
decision _alg_number = 0
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering9April 2000
Power Control Parameters (2)
Tim ing ...
p_con_interval p_con_intervalp_con_ack
Command Acknow ledged Command Not Acknow ledged
decision _alg_number = 1
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering10April 2000
Rapid Power Down
Functionality MS power is reduced faster
than the standard ramp downtime
Takes precedence over
conventional PC
Benefits Reduced UL interference
Reduced MS TX power Fast Power Down OFFFast Power Down ON
MS Tx Power
Up link RxLev
rpd_trigger
rpd_offset
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering11April 2000
Interaction between RPD and PC
Averaging & voting of normal PC is not utilised
No voting employed: hreqt, n, passumed as 1
Hreqavevalue equal to rpd_period
Ms_p_con_intervaltimer will be overridden if
l_rxlev_ul_por l_rxqual_ul_pexceeded
Recovery from a condition where RPD took the
MS to a low level or into poor quality
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering12April 2000
Configuration of Rapid Power Down
Configuration rapid_pwr_down
0 - OFF
1 - ON rpd_period
1 - 32 SACCH periods
rpd_trigger
0 - 63
rpd_offset 0 - 63
Algorithm
rpd_trigger
rpd_offset
l_rxlev_ul_p
u_rxlev_ul_p
Required level
ul_rxlev
63
0
Ordered power = current power + (ul_rxlevrpd_trigger + rpd_offset)/2
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering13April 2000
Implementation Results
Micro cell PC window l_rxlev_ul_p = 25
u_rxlev_ul_p = 35
+3 dB above PC window Rpd_period = 2
Rpd_offset = 8
Rpd_trigger = 38
+6 dB above PC window
Rpd_period = 2
Rpd_offset = 11
Rpd_trigger = 41
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering14April 2000
Radio Link Revival
The full_pwr_rflossfield enables or disables theability of the RSS to instruct the MS and BSS to use
maximum power when loss od radio resource is
detected.
Triggered when link_failcounter reaches the threshold
of link_about to_fail.
link_about_to_fail
BTS&MS full power
link_fail
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering15April 2000
POWER CONTROL OPTIMISATION
Upl ink RxLev
l_rxlev_ul_p = 20-90
dBm
Downl ink
RxLev
hreqave = 2
hreqt = 2
Upl ink RxQual
l_rxq ual_u l_p = 1143
Downl ink
RxQual
hreqave = 2 ; hreqt = 2
l_rxqu al_ul_p_hopp ing = 4505
u_rxlev_ul_p = 30
-80
dBm
l_rxlev_dl_p = 25-85
dBm
hreqave = 2
hreqt = 2
u_rxlev_dl_p = 35
-75
dBm
u_rxq ual_ul_p = 40
1
l_rxq ual_d l_p = 1143
l_rxqu al_dl_p_hopp ing = 4505
u_rxq ual_dl_p = 40
1
n1 = 1
p1 = 1
n2 = 2
p2 = 2
n3 = 1
p3 = 1
n4 = 2
p4 = 2
6
6
2
2
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering16April 2000
Standard Power Control
RxQual >l_rxqual_ul_h
&
RxLev > u_rxlev_ul_p
Decision_alg_number = 1
Tx Power
Cell A Cell B
qual_pw r_f lag =
1
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering17April 2000
Medidas de DL & UL
Producc ion de muestras promediadas
Muestras prom ediadas son com paradas con umbral
Se excede el um bral
Ajuste de la po tencia de sal ida
-110 dBm
-100 dBm
-90 dBm
-80 dBm
-70 dBm
0
10
20
30
40
l_rxlev_dl_p=25
u_rxlev_dl_p=35
-85 dBm
-75 dBm
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering18April 2000
Handover Workshop 01
Power Control(including handover thresholds)
RXQUAL POWER
CTLS
14 (0.14=BAND 0
1810 (18.10%) =BAND 77
4
1
3
5
6
2
2
8
113
5
7
45
3
226
905
0
BAND ASSUMED BER
u_rxqual_ul_p
l_rxqual_ul_
p
l_rxqual_ul_p_hopping
l_rxqual_ul_h_hopping
l_rxqual_ul_h
RXLEV POWER CTLS
-110
-47
-60
-70
-80
-90
-
100
6
3
0
10
20
30
50
4
0
-5060
RXLE
V
dBm
u_rxlev_ul_p
l_rxlev_ul_p
l_rxlev_ul_h_hopping
l_rxlev_ul_p_hopping
l_rxlev_ul_h_
rpd__trigger
Rpd_offset
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering19April 2000
Handover Workshop 01
Power Control(including handover thresholds)
RXQUAL POWER
CTLS
14 (0.14=BAND 0
1810 (18.10%) =BAND 77
4
1
3
5
6
2
2
8
113
5
7
45
3
226
905
0
BAND ASSUMED BER
u_rxqual_ul_p
l_rxqual_ul_
p
l_rxqual_ul_p_hopping
l_rxqual_ul_h_hopping
l_rxqual_ul_h
RXLEV POWER CTLS
-110
-47
-60
-70
-80
-90
-
100
6
3
0
10
20
30
50
4
0
-5060
RXLE
V
dBm
u_rxlev_ul_p
l_rxlev_ul_p
l_rxlev_ul_h_hopping
l_rxlev_ul_p_hopping
l_rxlev_ul_h_
rpd__trigger
Rpd_offset
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering20April 2000
Power Control Adjustment
Mobile usingless power
Also resultinggoodperformancein RF Loss
Rate
Before
After
Modified N &
P settings will
help the
effectiveness of
power control
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering21April 2000
Recommended N & P Settings
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering22April 2000
Funktion
BTS- und MS-Leistung werden laufend so nachgeregelt, dasowohl XX_RxLevund XX_RxQualinnerhalb einesdefinierten Fensters liegen.
Die Steuerung erfolgt durch laufende Messungen vonXX_RxLevund XX_RxQual(Measurement Reports)
Liegen die aktuellen Werte fr XX_RxLevund/oderXX_RxQual auerhalb des Fensters, so wird die BTS/MS-Leistung in Schritten von +6dB erhht
bzw von2dBm reduziert.
Zweck
In Summe weniger Leistungs-abgabe von BTS und MS
Es wird schlechter RxQual
entgegengewirkt
Power Control
-47dBmXX_Rx_Lev
63
0 -110dBm
l_rxlev_XX_p -90dBm
u_rxlev_XX_p -80dBm
P
O
W
E
R
W
I
N
D
O
W
0XX_Rx_Qual
0
7 1810
l_rxqual_XX_p 400
u_rxqual_XX_p 0
Q
U
A
L
W
I
N
D
O
W
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering23April 2000
Power Control
Dynamische Power Control
Bisher (vor GSR4) mit pow_inc_sep_size_XX (+6dB)undpow_red_sep_size_XX(-2dB) nur statische
Abstufungen der Leistungsregelung.
Ab GSR4 dynamische Power Increase/DecreaseSchritte mglich.
Je weiter die aktuellen XX_RxLex und/oderXX_RxQual Werte auerhalb des definierten Fenstersliegen umso grere Power Increase/Decrease Schrittewerden zur Leistungsregelung angewandt.
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering24April 2000
OPTIMISED POWER CONTROL
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering25April 2000
Optimised Power Control - Feature Overview
GSR3 GSR4
SINGLE power increase /
decrease step size for UL &DL
Separate for UL & DL
Power increase step size :
range of 2 - 6 db
Power increase step size : range
of 2 - 14 db
Step sizes FIXED in
database
Step sizes DYNAMICALLY
SET depd on current powerlevel
NO DL power level
oscillation prevention
control
DL oscillation prevention
included
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering26April 2000
SEPARATE increment/decrement step sizes for
uplink and down link
Optimised Power Control -Separate uplink & downlink step sizes
pow_inc_step_size_ulpow_inc_step_size_dl
pow_inc_step_size
pow_red_step_size_ul
pow_red_step_size_dlpow_red_step_size
2,4,6,8,10
,12,14 dB
2,4dB
* The increment step size must be >= the decrement step size
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering27April 2000
IF ENABLED , increment / decrement stepsize can be changed dynamically based on:
current power levelsproximity to upper / lower power thresholds
To ENABLE, set per cell elementdyn_step_adj to1:
chg_element dyn_step_adj 1 10 cell_number=0 01 0 1 1 1
Optimised Power Control -Dynamic Stepsize
RAPID_POWER_DOWN feature can workwith Optimised Power
Control at the same time.
When rapid power trigger point is reached, the feature
OVERRIDES any Optimised Power Control dynamic adjustment
decision
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering28April 2000
3 types of dynamic step size adjustments
Dynamic power stepsize increase due to poorRXQUAL
Dynamic power stepsize increase due to poorRXLEV
Dynamic power stepsizereduction due to goodRXQUAL
Optimised Power Control -Dynamic stepsize
*NO Dynamic powerstepsize reduction due to good RXLEV
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering29April 2000
Dynamic power increase due to poor RXQUAL
occurs when rxqual falls below the lower rxqual
threshold
l_rxqual_ul/dl_pstepsize= DYN_POW_INC_XX_Q =
MAX [ pow_inc_step_size_xx , fhigh ( Y) ]
where Y= l_rxlev_xx_p + pow_inc_step_size_xx - current_rxlev_xx
where fhigh( ) denotes the rounding up of a value to the
nearest multiple of 2 dB
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering30April 2000
Dynamic power increase due to poor RXQUAL
If current power is below lower power threshold, dynamicstepsize will increase power to a standard step size abovethe lower power threshold. Otherwise dynamic stepsize willbe by the standard step size.
EG. If poor rxqual AND power level is below lower powerthreshold...
l_rxlev_ul_p
u_rxlev_ul_pPower level
pow_inc_step_size_ul
Dynamicstep size
current_rxlev_ul
Current power level
Standard stepsize
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CUSTOMER SUPPORT SERVICES DIVISION
Network Operations Engineering31April 2000
Dynamic power increase due to poor RXLEV
occurs when rxlevfalls below the lower rxlev threshold
l_rxlev_ul/dl_p
stepsize= DYN_POW_INC_XX_L = fhigh ( Y)
where Y = l_rxlev_xx_p + pow_inc_step_size_xx - current_rxlev_xx
A dynamic power increase stepsize due to low level will
bring the power up to a standard step size above the
lower threshold of the power box
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
32April 2000
Dynamic power reduction due to good RXQUAL
occurs when rxqual is above the upper rxqual
threshold
u_rxqual_ul/dl_pstepsize= DYN_POW_RED_XX =
MAX [ pow_red_step_size_xx , f low ( Y) ]
where Y = (dyn_step_adj_fmpr /10 ) * (current_rxlev_xx -
u_rxlev_xx_p)
where f low( ) denotes the rounding down of a value to the
nearest multiple of 2 dB
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
33April 2000
Dynamic power reduction due to good RXQUAL
where valid range for dyn_step_adj_fmpr is 0
- 10
chg_element dyn_step_adj_fmpr 10 1cell_number=0 0 1 0 1 1 1
The rateof power reduction bringing power
back to the top of the power box isproportional to dyn_step_adj_fmpr(with a
minimum required reduction of
pow_red_step_size_xx)
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
34April 2000
Dynamic power reduction due to good RXQUAL
EG. If good rxqual AND current power level isabove the upper threshold AND dyn_step_adj_fmpris 10.
l_rxlev_ul_p
u_rxlev_ul_p
Power level
Dynamic
step size
current_rxlev_ul
Current power level
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
35April 2000
BTS power downlink ocillations
Defined as a rxqual based power reductionresulting in an immediate rxlev based powerincrease
If the following condition is true, an RXQUALbased power reduction will NOT beperformed:
current_rxlev_dl < l_rxlev_dl_p + pow_red_step_size_dl
+ 2dB
Note: We currently have a different algorithm whichhandles this for uplink power oscillation.
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
36April 2000
BTS power downlink ocillations
l_rxlev_dl_p
u_rxlev_dl_p
pow_red_step_size_dl
Is current_rxlev_dl
less than this level??
Standard stepsize
Power level
2dB
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
37April 2000
Optimised Power Control
Separate Increment and Decrement steps for ULand DL
Range of values for Power Increment Stepextendedpow_inc_step_size_ul = 2, 4, 6, , 14
dBpow_red_step_size_ul = 2, 4 dB
MSpow_inc_step_size_dl = 2, 4, 6, , 14
dBpow_red_step_size_dl = 2, 4 dB
BTS
Apply dynamic Increment and Decrement steps based
on the position of current power level in the PC window
dyn_step_adj: Enables/disables the Dynamic Step Adjustment algorithm
dyn_step_adj_fmpr: Controls the rapidity of a dynamic power reduction
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
38April 2000
Optimised Power Control (2)
Dynamic Power Control
Dynamic power increase due to poor qualityDYN_POW_INCR_XX_Q = max [pow_inc_step_size_xx, fhigh(l_rxlev_xx_p - av_rxlev_xx +
pow_inc_step_size_xx)]
The power increases more rapidly if the power is below the power windowthan if it is within it
Dynamic power increase due to low levelDYN_POW_INCR_XX_L = fhigh(l_rxlev_xx_p - av_rxlev_xx + pow_inc_step_size_xx)]
Dynamic power reduction due to good qualityDYN_POW_RED_XX_Q = max [pow_red_step_size_xx, fhigh((dyn_step_adj_fmpr / 10) * (av_rxlev_xx -
u_rxlev_xx_p))]
NO dynamic power reduction due to good level
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
39April 2000
Optimised Power Control (3)
Oscillation Prevention
MS uplink power oscillations prevention mechanism
already existed. Activated with mspwr_alg NEW BTS downlink power oscillations prevention
algorithm. Activated withdyn_step_adj
A quality based power reduction will be ignored if:
av_rxlev_dl < (l_rxlev_dl_p + pow_red_step_size_dl + 2 dB)
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
40April 2000
Enhanced Congestion Relief
Expand the decision process for handover toinclude the state of congestion at the target cell
Incorporate the added dimension of Time
Band Aware congestion relief
5 New proceduresNon-Imperative handover rejection
Congestion relief handover retry Incoming handover requests
Handover retry
Multi-band MS redirection
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
41April 2000
Enhanced Congestion Relief (2)
Non-Imperative Handover Rejection
The BSS rejects an incoming non-imperative(congestion relief) handover if it will causecongestion relief procedures to be triggered in thetarget cell
Avoids the propagation of congestion
Congested
Congested
Congest ion
Relief 1
Congest io
n Relief 2
x
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
42April 2000
Congested
Congested
Enhanced Congestion Relief (3)
Congestion Relief Handover Retry
The source cell will not attempt a congestion reliefhandover, for a period of time, to a target cell which had
rejected a previous handover attempt
Timer: retry_candidate_period
Timer does not affect imperative retriesCR HO Atmp t
2
CR HO Atmpt
1xRetry_candidate_period
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
43April 2000
Enhanced Congestion Relief (4)
Incoming Handover Requests
New parameter in the target cell:
congest_at_target: Controls the behaviour of the target cell 0: No action if the cell rejects a handover request 1: Invoke congestion relief if the cell rejects a handover request
If the target cell rejects an incoming handover because it would
trigger congestion relief, and congest_at_target = 1, it will start
congestion relief to empty a channel and inform the source cell(intra-BSS only) in the future that the congestion situation has
disappeared
When the target cell accepts an incoming handover and results in
congestion relief invoked, it never attempts a handover back to
the source cell that started the process
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
45April 2000
Enhanced Congestion Relief (6)
Multi-band Mobile Station Redirection
New parameter:
mb_tch_congest_thres: (0 - 100%) Percentage point atwhich multi-band mobiles start to be redirected to the
preferred band. The BSS does not allow an incoming band preference handover if
permitting it would cause this percentage to be exceeded
IMPORTANT: Associated Parameters for enhanced CR handover_required_reject_switch = 1 (MSC sends a handover reject message
to the BSC if an external target can not accept the handover)
number_of_preferred_cells = 1 (1 target cell in the handover required message)
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CUSTOMER SUPPORT SERVICES DIVISIONNetwork Operations Engineering
46April 2000
Directed Retry
HO from SDCCH (congested cell) to TCH (neigh.)
Increase the effective capacity of the system
Requires the MSC to support DR procedures
Decision based in a single Measurement Report
SDCCHconnection
DR HO
DR HO
CongestedMicrocell
DR HO's(SDCCH-TCH)
Macrocell
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Congestion Relief No special requirements in the switch More accurate averaging
SDCCHconnection
CongestedMicrocell
CR HO
CR HO CR HO
CR HOCR HO's(TCH-TCH)
Macrocell
More effectivetechnique than
Directed Retry
Recommended