bscoh04c
DESCRIPTION
GSMTRANSCRIPT
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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step 1: Measurement Handling
step 2: Filtering
step 3: Basic Ranking
step 4: Penalty Handling
step 6: Urgency Conditions
step 7: Evaluation of network-features
step 8: Organizing the Candidate List
step 9: Sending the list to Call Process
step 10: Evaluation of allocation result
Call Process
step 5: Handling fast moving mobiles
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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BTS
BSTXPWR
MSRXMIN
no coverageno call possible
calls possible
RXLEV
distance to BTS
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Sector Cells
A
B
C
3-sector site cell in a shopping mall
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4/12 Cell Pattern
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Location Areas Are Divided Into CellsWith Their Own Identity
LAI 1
LAI 2
LAI 3CI=0001
CI=0001CI=0001
LAI 1
LAI 2
LAI 3
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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PLMN Color Code
Country ANCC =1
Country BNCC =2
Country CNCC =3
f15
f29
f33
f26
f6 f1
f1
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Base Station Color Code
f6
f28
f2
f10
f25
f15y
f36 f15xBCC =2
BCC =2
BCC =2
BCC =3Country B
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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CCCH Location in a Multiframe
SCH
BCCH CCCHB0
FCCH
SCH
CCCHB2
FCCH
SCH
CCCHB4
FCCH
SCH
CCCHB6
FCCH
SCH
CCCHB8
CCCHB1
CCCHB3
CCCHB5
CCCHB7
5 10 15 20 25 30 35 40 45 50
OWNLINK BCH51 - frame (235.4ms)
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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MS Listening for Paging Request
35 40 45 50 0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50 0 5 10 15
DOWNLINK DOWNLINK DOWNLINK
BCH 51 - frame (235.4ms) BCH 51 - frame (235.4ms)
Multiframe Multiframe
Period 470.8 ms (2 x 235.4ms)
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Subcell Structure
UnderlaidBCCH, SDCCH,TCH
OverlaidSDCCH,TCH
BTS
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Use of the TSC
B
D
Interference
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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The M,L, and K Criteria
Cells rankedaccording to
L-criteriaCells rankedaccording to
K-criteria
Acceptedcells
Unacceptedcells
M-algorithm
Rankedbetter
Rankedworse
K-algorithm L-algorithm
PO-Cell list
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Pathloss
pathloss L
distance to BTS
BSTXPWR
MS_RXLEV
MS
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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RXLEV
L
point of HO in K-ranking
point of HO in L-ranking
Cell BCell A
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Interpolation of Missing Measurements
40 41 30 19 * * 18 25 * 28 30
Missing Reports Signal Strength
19 + 18.66 + 18.33 + 18 => 18.
27 + 27.5 + 28 => 27.5
Interpolation
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Penalty Handling
Cell A (serving cell)
Cell B
Cell C
Cell E
Cell F
Cell C (serving cell)
Cell B
Cell A
Cell E
Cell F
Cell D
Cell C (serving cell)
Cell B
Cell A
Cell E
Cell F
Cell D
before HO attempt after HO failure to Cell B after expiry of PTIMHF
Cell D
A B D
Cell A (serving cell)
Cell B
Cell C
Cell E
Cell F
Cell D
C
after successful handover to Cell C
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Cell Hierarchy
Layer 3("Umbrella").
Layer 2("Normal")
Layer 1("Micro")
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Cell Level Change, Moving Up
LEVTHR
LEVTHR - LEVHYST
RXLEV(o)
moving upstay in cell
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Cell Level Change, Moving Down
LEVTHR
LEVTHR + LEVHYST
RXLEV(n)
move down stay in cell
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Fast Moving MS
Cell A: layer-2
Cell B: layer-1
Cell C: layer-1
HO HOHOHO HOHO
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Timers for Intra-Cell Handover
TMAXIHO
TMAXIHO
TMAXIHO
TMAXIHO
a) consecutive b) not consecutive
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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TMAXIHO = 3
TMAXIHO
TMAXIHO
TMAXIHO
TIHO
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Subcell Handover, UL to OL
LOL
HO from OL to ULwith hysteresis
BSTXPWR_UL
BSTXPWR_OL
RXLEV
distance from BTS
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Subcell Handover, OL to UL
point of HO from OL to ULwithout hysteresis
LOL
BSTXPWR_UL
BSTXPWR_OL
RXLEV
distance from BTS
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Bad Quality Handover Offset
Cell ACell B
nominal border of HO
Bad quality handover allowed
Bad quality handover not allowed
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Preventing Unnecessary LocatingUpdating Procedure
f 10f 4
Location Area A
Location Area B
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Discontinuous Transmission
SLEEP SLEEP
SPEECH
POWER
SPEECH
POWER
SPEECH
POWER
SILENCE SILENCE
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Allowed to Handover According to theParameter NCCPERM
NCC = 4
NCC = 4
NCC = 4NCC = 4
NCC = 4
NCC = 1
NCC = 1
NCC = 1 NCC = 1
NCC = 1NCC = 1NCC = 1
f 28 f 29
f 30
f 31
f 32
f 2
f 1 f 13f 17 f 15
f 31
f 20 f 16 f 75
f 30f 18f 21 f 13
f 5 f 3 f 4 f 76
f 12
f 3
Country ANCC = 2
Country BNCC = 3
Country CNCC = 1 & 4
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Choice of RACH When TX Is Set to 12
RACH
RACH
RACH
RACH
RACH
RACH
RACH
RACH
RACH
RACH
RACH
RACH
RACH
ACCESS 1 ACCESS 2 ACCESS 3 ACCESS 4
Wait Wait Wait
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Cell Load Sharing Parameters
100% idle 0% idle
0% idle 100% idle
CLSACC
CLSLEVEL CLS-handover accepted
CLS active
CLS-handover accepted
Cell BCell A
CLSACC
CLSLEVEL
CLS active
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Cell Load Sharing Hysteresis
Cell A Cell B
nominal border of HO
border for HO from A to Bfor RHYST=0%
border for HO from A to Bfor RHYST=0%
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Default Interference Bands
Band RXLEV dBm
1 0-4 <-106
2 5-8 -106 to -102
3 9-15 -102 to -95
4 16-25 -95 to -85
5 26-63 -85 to >-48
Copyright © 1998 by Ericsson Radio Systems AB2882-EN/LZT 123 3801 Rev C
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Connection of Channel Groups toTranceiver Groups
BSC
Cell Data File
CHGR=0
CHGR=1
MO = TG
TRX 1
TRX 2