05 RN2010EN13 BSSPAR1 S13 Chapter 05 Measurement Processing v1.1

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Module Objectives
Explain the coding of RX level and RX quality measurements and the mapping of bit error and frame erasure measurements to RX qualities
Discuss the execution of measurements by the MS, when it is in idle or dedicated mode
Indicate the criteria to add adjacent cell data to the enhanced measurement report
Give an overview about the processing of measurement data obtained by the MS or BTS
Explain the pre-processing of measurement data by the BTS
Discuss the normal averaging performed by the BSC for normal and DTX traffic
Describe the fast averaging performed during call set up, after handover and after power control
Explain the book keeping options to reduce the amount of measurement data
Explain Enhanced Measurement Reporting (EMR)
3G cells
3G cells
BTS performs UL measurements
-110 -100 0
-109 -99 1
-108 -98 2
scaleOrd (SCO)(SEG)(0,1,2)(0)
2 = MS decides automatically about offset
BEP BER (%) QUAL
X axis: frame erasure rate (< 1%, 1-5 %, 5-10 %, 10-15 %, > 15 %)
Y axis: RX quality (0..7)
Z axis: Percentage of measurements for each FER category
Frame Erasure Rate for Handover / Power Control Decision
fepInPcHoUse (FPHO)(BSC)(Y,N)(N)
for adjacent cells every 5 min
Pre-synchronization and decoding of BSIC
for adjacent cells every 30 s
Adjacent cell list
Detects whether DTX is used
26 FRAME MULTIFRAME = 120 ms
TDMA FRAMES
BSIC decoding for at least one adjacent cell
Pre-synchronization on SCH
New adjacent cell
If not successful -> old adjacent cell list + new try
Measurement results of best adjacent cells sent to BSC every SACCH period 480 msec
With / without elimination of
For RX level, RX quality and
Distance between MS and BTS
Measurements
Handover ?
Averaging over 1-4 SACCH periods
Delay of (btsMeasAver - 1) * 480 ms
Reduced transmission and processing load in BSC (-> Abis interface when 16 kbit signalling is used)
No sliding window
Normal Traffic
btsMeasAver = 2
ho/pcAverageLevDL/UL = 4
50
35
45
25
hoAverageLevDL/UL 1..32 for Rx level for handover
hoAverageQualDL/UL 1..32 for Rx quality for handover
pcAverageLevDL/UL 1..32 for Rx level for power control
pcAverageQuakDL/UL 1..32 for RX quality for power control
msDistanceAveragingParam 1..32 for distance MS-BTS for MS distance handover
DTX Traffic
btsMeasAver = 1
pcAverageLevDL/UL 1..3 for Rx level for power control
pcAverageQuakDL/UL 1..3 for RX quality for power control
DTX Control
dtxMode 0..2 0 = optional, 1 = mandatory, 2 = not used
DTX Y N N Y N N Y Y
Weight 1 2 2 1 2 2 1 1
Average = (1*45 + 2*35 + 2*50 + 1*25) / 6 = 40
Average = (2*35 + 2*50 + 1*25 + 2*20) / 7 = 34
Average = (2*50 + 1*25 + 2*20 + 2*20) / 7 = 29
Average = (1*25 + 2*20 + 2*20 + 1*10) / 7 = 16
Average = (2*20 + 2*20 + 1*10 + 1*15) / 6 = 15
After Handover
btsMeasAver = 2
50
35
45
25
(40+45+30+35) / 4 = 38
(45+30+35+50) / 4 = 40
Fast Averaging during Call Set Up
enaFastAveCallSetup (EFA)(HOC)(Y/N)(N)
btsMeasAver = 2
50
35
45
25
8 SACCH
enaFastAvePC (EFP)(HOC)(Y/N)(N)
btsMeasAver = 2
4
3
4
4
(2+1+1+0) / 4 = 1
(1+1+0+1) / 4 = 1
Fast Averaging after Power Control
enaFastAvePC (EFP)(HOC)(Y/N)(N)
msSpeedDetectionState (SDS)(HOC)(0..100)(0)
0 = MS speed used to decide about macro / micro cell handover
1..100 = no handover due to MS speed
scaling of average window to indicated percentage
Slow mobile
Fast mobile
Book Keeping
BTS Sample ->
BSC can maintain up to 32 last measurements for up to 32 adjacent cells
averagingWindowSizeAdjCell (AWS)(HOC)(1…32)(6)
Window size for averaging the signal quality, signal level and distance measurement results of adjacent cells
allAdjacentCellsAveraged (AAC)(HOC)(Y/N)(N)
N = MS sends data for currently 6 best 2G cells only (other data set to zero result)
allUtranAdjAver (UAAC)(HOC)(Y/N)(N)
N = MS sends data for currently 3 best 3G cells only (other data set to zero result)
numberOfZeroResults (NOZ)(HOC)(0..7)(2)
Maximum number of 2G zero results to be ignored for BSC averaging
noOfZeroResUtran (UNOZ)(HOC)(0..32)(5)
Maximum number of 3G zero results to be ignored for BSC averaging
btsMeasAver = 1
AveragingWindowSizeAdjCell = 8
allAdjacentCellsAveraged = N
numberOfZeroResults = 2
Enhanced Measurement Report (EMR)
The enhanced measurement reporting based on 3GPP TS 44.018 (new downlink measurement report) provides the system with enhanced serving and neighbour cell measurements:
Number of Frames Erased
Usage of Bit Error Probability (BEP) instead of Rx Quality
Extended RXLEV range for signal strength
Enlarged number of reported neighbours; up to 15
WCDMA neighbours reporting capability
with EMR reporting capability
BSS S11 or later
Idle BA list is not used in the serving cell (except if DFCA is active, then idle BA list and EMR can work together)
MEASUREMENT INFORMATION message
Neighbour cell BSIC codes (in addition to BCCH)
RTD (Real time difference) information of neighbour cells (those under same BSC and in LMU sync)
User defined parameters for EMR reporting
Adjacent cell reporting (EMR)
Upto 15 GSM and WCDMA RAN neighbour cells in one report
BSC sends reporting parameters to MS in MEASUREMENT INFORMATION message
MS reports neighbours in order of priority set by the reporting parameters
Priority of reporting
Max number of reported neighbours in the category
1
GSM neighbour cells with known and valid BSIC from the frequency band of the serving cell
GSM neighbour cells with RX Level equal to or greater than reporting threshold (RTxx) for the specific band
serving band reporting (SBR)
2
GSM neighbour cells with known and valid BSIC from other than the serving cell frequency band
GSM neighbour cells with RX Level equal to or greater than reporting threshold (RTxx) for the specific band
multiband cell reporting (MBR) parameter.
3
Best valid cells from the WCDMA RAN neighbour cell list.
WCDMA neighbour cells with Rx Level >= reportingParamsFdd (FRT)
number of measured FDD cells (FDMR)
4

The GSM cells with known and allowed network colour code (NCC) part of BSIC from any GSM frequency band ( if indicated by the invalid BSIC reporting (IBR))
Remaining valid WCDMA RAN neighbour cells.
Enhanced Report
according 4 categories
2 2G known + valid other yes
3 3G yes
RX Level Offset
Gives cells higher preference
Number of adjacent cells to be added to enhanced report
servingBandReporting 0..3 cells of category 1
multiCellBandReporting 0..3 cells of category 2
fddMultirateRep 0..3 cells of category 3
invalidBsicReporting 0..1 cells of category 4 with invalid BSIC
RX level threshold to be exceeded by cells of category 1-3
reportingParamsXXX cells of category 1 and 2
XXX stands for GSM band (850, 900, 1800, 1900)
3 kinds of settings: cell added to category 1/2 anyhow
cell must exceed threshold of 6..36 dB
cell not added to category 1/2 at all
reportingParamsFdd cells of category 3
3 kinds of settings like for category 1 and 2
RX level offset for cells of category 1-3
reportingParamsXXX cells of category 1 and 2
XXX stands for GSM band (850, 900, 1800, 1900)
offset between 0..42 dB
offset between 0..42 dB
Reporting thresholds and offsets
Reporting thresholds for Priority 1 and 2 cells are set for each band
Reporting offset can be set for Priority 1 and 2 cells to favour these cells
Parameter
Remark
reportingParams850 (RT8)(HOC)(0..7)(0)
Threshold for GSM 850 cell. If the parameter is set to 0, the cell is put into category 1 and 2 in general. If it is set to 1..6, the threshold is 6..36 dB (in steps of 6 dB). If it is set to 7, the cell will not enter category 1 or 2 at all.
Threshold for GSM 900 cell. The parameter is applied by the same way as for GSM 850.
Parameter
Remark
reportingParams850 (R8)(HOC)(0..7)(0)
Rx level offset for GSM 850 cell. The setting 0..7 correspond to an offset of 0..42 dB (in steps of 6 dB).
Rx level offset for GSM 900 cell. The parameter is applied by the same way as for GSM 850.
Measurement Averaging in BTS (EMR)
Averaging in BTS controlled by btsMeasAver (BMA)(1…4, step 1)(Default = 1)
Name of the field
BA_USED
3G_BA_USED
BSIC_Seen
Set 1 if set 1 in any of reports to be averaged
SCALE
DTX_USED
Set "used" if set "used" in any of reports to be averaged
RXLEV_VAL
Averaged
RX_QUAL_FULL
Averaged
MEAN_BEP
Averaged
NBR_RCVD_BLOCKS
BCCH-FREQ-NCELL

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05 RN2010EN13 BSSPAR1 S13 Chapter 05 Measurement Processing v1.1