1. Channel Switching Trial Parameter Changes on RNC


(1)
Implemented TC3 settings on RNC on 2007-07-26 at 12:00
Settings were
 downswitchThreshold from 0 to 8 kbps
- Threshold for channel switching from dedicated channel to FACH/RACH
- Down-switch timer started if throughput drops below 8 kbps

downswitchTimerThreshold from 0 to 16 kbps
- Timer threshold to achieve hysteresis for channel switching from dedicated channel to
FACH/RACH
- Down-switch timer stopped/cleared if throughput goes above 16 kbps

inactivityTimer from 30 to 45 (seconds)
- Timer for sending of IU RELEASE REQUEST message to the CN for UEs in state CELL_FACH
- Cell_FACH -> Idle if no activity for 45 seconds

upswitchTimer from 5 to 25 (100ms)
- Time during which the bandwidth utilisation is allowed to be high before an up-switch request is
issued
- Throughput & code power conditions for up-switch must be met for 2.5 seconds before up-switch
is attempted
-
downswitchTimer unchanged at 10 (100ms)
- Timer for channel switching from dedicated channel to FACH/RACH. Down-switch after 1 second
1

2. Impact of Channel Switch Parameter Changes on RNC – 1

Stats from 2007-07-14 to 2007-07-26

 384kbps Average
= 188.68 (49%)
 128kbps Average
= 61.63 (48%)
 64kbps Average
= 10.94 (17%)
(2)
Stats from 2007-07-26 to 2007-07-06
 384kbps Average
= 232.46 (61%)
 128kbps Average
= 81.25 (63%)
 64kbps Average
= 15.83 (25%)
(RAB Efficiency in Brackets)
2

3. Impact of Channel Switch Parameter Changes on RNC – 2
(3)
Reduction in
• pmChSwitchP128P384 from 27633/day to 15871/day
• pmChSwitchP64P128 from 60081/day to 43972/day
• pmFailedDCHChSwitch from 21372/day to 4897/day
Increase in
• pmChSwitchDCH64FACH from 383539/day to 508656/day
• pmChSwitchFACHDCH from 235664/day to 365217/day
3

4. Impact of Channel Switch Parameter Changes on RNC – 3
(4)
Increase in
• pmDLTrafficVolumePS64 from 32534Mbits/day to 46148Mbits/day
• pmDLTrafficVolumePS128 from 42385Mbits/day to 48908Mbits/day
• pmDLTrafficVolumePS384 from 139290Mbits/day to 160548Mbits/day
Reduction in Avg No. of Users per PS RAB
PTRNC1 Average Num ber of Users per PS RAB
PS64 from 39 to 34 (15%)
50
45
40
35
30
25
20
15
10
5
0
PS128 from 9 to 7 (21%)
PS384 from 10 to 8 (20%)
Average No. of Users PS384
Average No. of Users PS128
2007.08.05
2007.08.04
2007.08.03
2007.08.02
2007.08.01
2007.07.31
2007.07.30
2007.07.29
2007.07.28
2007.07.27
2007.07.26
2007.07.25
2007.07.24
2007.07.23
2007.07.22
2007.07.21
2007.07.20
2007.07.19
2007.07.18
2007.07.17
2007.07.16
2007.07.15
2007.07.14
Average No. of Users PS64
4

5. Impact of Channel Switch Parameter Changes on RNC – 4
(5)
Reduction in
• DLAvgRLSF8 from 894/day to 772/day
• DLAvgRLSF16 from 803/day to 632/day
• DLAvgRLSF32 from 3846/day to 3499/day
Reduction in
• DLAvgRLSF8 from 894/day to 772/day
Reduction in Average Code Power of SF32 by 49%, SF16 and SF8 by 26%
respectively
• DLAvgRLSF16 from 803/day to 632/day
i.e. average power transmitted over the Dedicated Physical Channel (DPCH)
• DLAvgRLSF32 from 3846/day to 3499/day
stored in applicable counter depending on the Spreading Factor (SF).
5

6. Channel Switching Trial Conclusions on RNC

Average Throughput per RAB has increased due to new settings
 PS64 increased by 45% from 11kbps to 16 kbps
 PS128 increased by 31% from 62kbps to 81 kbps
 PS384 increased by 23% from 189kbps to 232kbps

Reduction in Channel up-switches and Failed DCH Channel switches
 pmChSwitchP128P384 by 43% (27633/day to 15871/day)
 pmChSwitchP64P128 by 27% (60081/day to 43972/day)
 pmFailedDCHChSwitch by 77% (21372/day to 4897/day)

Increase in PS DL Traffic Volumes/RAB
 PS64 from 32534Mbits/day to 46148Mbits/day (42%)
 PS128 from 42385Mbits/day to 48908Mbits/day (15%)
 PS384 from 139290Mbits/day to 160548Mbits/day (15%)

(6)
Decrease in Average Number of Users per PS RAB
 PS64 from 39 to 34 (15%)
 PS128 from 9 to 7 (21%)
 PS384 from 10 to 8 (20%)
6

7. Channel Switching Trial on RNC –Average Data Throughput

(7)
Average Data Throughput increased from 47.88 kbps to 60.20 kbps (25.73%) for
Dedicated RABs
Number of users for FACH on RNC increased from 171.37 to 214.12 and FACH
Data Throughput increased from 0.21 kbps to 0.27 kbps

T h ro u g h p u t p e r R a b
300
250
P
P
P
A
150
64
64
64
vg
/P
/P
/P
D
6
1
3
a
4
28
84
ta
100
50
2007.08.07
2007.08.06
2007.08.05
2007.08.04
2007.08.03
2007.08.02
2007.08.01
2007.07.31
2007.07.30
2007.07.29
2007.07.28
2007.07.27
2007.07.26
2007.07.25
2007.07.24
2007.07.23
2007.07.22
2007.07.21
2007.07.20
2007.07.19
2007.07.18
2007.07.17
2007.07.16
2007.07.15
0
2007.07.14
Throughput (kbps)
200
D ATE
7

8. Impact on CSSR Packet and CSSR HS



(8)
Improvement on RNC in CSSR Packet from 92.84% to 95.07% and CSSR HS from
92.95% to 95.08%
Despite an increase in pmNoFailedAfterAdm from 34646/day to 50984/day, there
has a decrease in pmNoFailRABEstAtLackDLChnlCode from 26973/day to
17032/day. Also a decrease in pmNoReqDeniedAdm from 54707/day to
34027/day
Decrease in pmNoOfNonHOReqDeniedInteractive from 41790/day to 32238/day
CSSR Packet from 92.84% to 95.07%
CSSR HS from 92.95% to 95.08%
8

9. Impact on Other Accessibility Counters
(9)
Increase in pmNoFailedAfterAdm from 34646/day to 50984/day
Decrease in pmNoFailRABEstAtLackDLChnlCode from 26973/day to 17032/day
Decrease in pmNoReqDeniedAdm from 54707/day to 34027/day
Decrease in pmNoOfNonHOReqDeniedInteractive from 41790/day to 32238/day
9

10. Parameters used in Trial for Reference
(10)
Parameter (P4.0.24)
Value
ChannelSwitchingId
allowSwitchToCommon
bandwidthMargin
coverageTimer
dlRlcBufUpswitch
dlRlcBufUpswitchMrab
downswitchPwrMargin
downswitchThreshold
downswitchTimer
downswitchTimerSp
downswitchTimerThreshold
downswitchTimerUp
filteringCoefficient
hsdschInactivityTimer
inactivityTimer
inactivityTimerDch
multiRabSp0Available
multiRabUdi8Available
pendingTimeAfterTrigger
repeatTimer
reportHysteresis
thpReportInterval
ulRlcBufUpswitch
ulRlcBufUpswitchMrab
upswitchPwrMargin
upswitchTimer
1
1
90
10
500
0
2
8
10
2
16
60
6
10
45
30
0
0 (OFF)
1
4
6
5
256
8
6
25
10

11. Channel Switching Trial Parameter Changes Recap


(11)
Implemented TC3 settings on RNC on 2007-09-07 at 9:40 and on RNC on 2007-09-10 at 10:30
Settings were
 downswitchThreshold from 0 to 8 kbps
- Threshold for channel switching from dedicated channel to FACH/RACH
- Down-switch timer started if throughput drops below 8 kbps

downswitchTimerThreshold from 0 to 16 kbps
- Timer threshold to achieve hysteresis for channel switching from dedicated channel to
FACH/RACH
- Down-switch timer stopped/cleared if throughput goes above 16 kbps

inactivityTimer from 30 to 45 (seconds)
- Timer for sending of IU RELEASE REQUEST message to the CN for UEs in state CELL_FACH
- Cell_FACH -> Idle if no activity for 45 seconds

upswitchTimer from 5 to 25 (100ms)
- Time during which the bandwidth utilisation is allowed to be high before an up-switch request is
issued
- Throughput & code power conditions for up-switch must be met for 2.5 seconds before upswitch is attempted

downswitchTimer unchanged at 10 (100ms)
- Timer for channel switching from dedicated channel to FACH/RACH. Down-switch after 1
second
11

12. Impact of Channel Switching Changes on RNC – 1

Stats from 2007-09-01 to 2007-09-07

 384kbps Average
= 213.28 (55%)
 128kbps Average
= 62.30 (49%)
 64kbps Average
= 10.28 (16%)
(12)
Stats from 2007-09-07 to 2007-09-16
 384kbps Average
= 216.05 (56%)
 128kbps Average
= 78.61 (61%)
 64kbps Average
= 15.33 (24%)
12

13. Impact of Channel Switching Changes on RNC – 2
(13)
Reduction in
• pmChSwitchP128P384 from 12438/day to 6117/day
• pmChSwitchP64P128 from 30695/day to 18722/day
• pmFailedDCHChSwitch from 16053/day to 13325/day
Increase in
• pmChSwitchDCH64FACH from 238619/day to 264930/day
• pmChSwitchFACHDCH from 129032/day to 178576/day
13

14. Impact of Channel Switching Changes on RNC – 3
(14)
Changes in
• pmDLTrafficVolumePS64 from 16321Mbits/day to 20942Mbits/day
• pmDLTrafficVolumePS128 from 21121Mbits/day to 20852Mbits/day
• pmDLTrafficVolumePS384 from 109623Mbits/day to 678918Mbits/day
JHRNC1 Average Num ber of Users per PS RAB
25
Average No. of Users PS128
15
Average No. of Users PS384
10
Average No. of Users PS64
5
Date
2007.09.16
2007.09.15
2007.09.14
2007.09.13
2007.09.12
2007.09.11
2007.09.10
2007.09.09
2007.09.08
2007.09.07
2007.09.06
2007.09.05
2007.09.04
2007.09.03
2007.09.02
0
2007.09.01
Users
20
Reduction in Avg No. of Users
per PS RAB
PS64 from 19.8 to 16.4 (17%)
PS128 from 3.9 to 3.1 (21%)
PS384 from 5.8 to 3.7 (36%)
14

15. Impact of Channel Switching Changes on RNC – 4
(15)
Reduction in Average Code Power of SF32 by 34%, SF16 by 15% and
SF8 by 34% respectively
i.e. average power transmitted over the Dedicated Physical Channel (DPCH)
stored in applicable counter depending on the Spreading Factor (SF).
Reduction in
• DLAvgRLSF8 from 548/day to 378/day
• DLAvgRLSF16 from 380/day to 315/day
• DLAvgRLSF32 from 2089/day to 1861/day
15

16. Impact of Channel Switching Changes on RNC – 1

Stats from 2007-09-01 to 2007-09-10

 384kbps Average
= 202.79 (53%)
 128kbps Average
= 67.27 (53%)
 64kbps Average
= 11.30 (18%)
(16)
Stats from 2007-09-10 to 2007-09-16
 384kbps Average
= 247.07 (64%)
 128kbps Average
= 77.86 (61%)
 64kbps Average
= 15.16 (24%)
16

17. Impact of Channel Switching Changes on RNC – 2
(17)
Reduction in
• pmChSwitchP128P384 from 20089/day to 13309/day
• pmChSwitchP64P128 from 45596/day to 35990/day
• pmFailedDCHChSwitch from 27972/day to 23347/day
Increase in
• pmChSwitchDCH64FACH from 303393/day to 374682/day
• pmChSwitchFACHDCH from 174132/day to 247082/day
17

18. Impact of Channel Switching Changes on RNC – 3
(18)
Changes in
• pmDLTrafficVolumePS64 from 28393Mbits/day to 34131Mbits/day
• pmDLTrafficVolumePS128 from 42661Mbits/day to 38656Mbits/day
• pmDLTrafficVolumePS384 from 175631Mbits/day to 169148Mbits/day
40
35
30
25
20
15
10
5
0
Average No. of Users PS128
Average No. of Users PS384
Date
2007.09.16
2007.09.15
2007.09.14
2007.09.13
2007.09.12
2007.09.11
2007.09.10
2007.09.09
2007.09.08
2007.09.07
2007.09.06
2007.09.05
2007.09.04
2007.09.03
2007.09.02
Average No. of Users PS64
2007.09.01
Users
RBRNC1 Average Num ber of Users per PS RAB
Reduction in Avg No. of
Users per PS RAB
PS64 from 29.3 to 27.2 (7%)
PS128 from 7.1 to 5.4 (24%)
PS384 from 9.7 to 7.7 (21%)
18

19. Impact of Channel Switching Changes on RNC – 4
(19)
Reduction in Average Code Power
of SF32 by 15%, SF16 by 14% and
SF8 by 22% respectively
Changes in
• DLAvgRLSF8 from 900/day to 700/day
• DLAvgRLSF16 from 689/day to 568/day
• DLAvgRLSF32 from 3131day to 3417/day
19

20. Parameters used in Channel Switching Trial for Reference
(20)
Parameters (P4.0.24)
Value
ChannelSwitchingId
allowSwitchToCommon
bandwidthMargin
coverageTimer
dlRlcBufUpswitch
dlRlcBufUpswitchMrab
downswitchPwrMargin
downswitchThreshold
downswitchTimer
downswitchTimerSp
downswitchTimerThreshold
downswitchTimerUp
filteringCoefficient
hsdschInactivityTimer
inactivityTimer
inactivityTimerDch
multiRabSp0Available
multiRabUdi8Available
pendingTimeAfterTrigger
repeatTimer
reportHysteresis
thpReportInterval
ulRlcBufUpswitch
ulRlcBufUpswitchMrab
upswitchPwrMargin
upswitchTimer
1
1
90
10
500
0
2
8
10
2
16
60
6
10
45
30
0
0 (OFF)
1
4
6
5
256
8
6
25
20