Download - Siemens Dualband Strategy
-
7/29/2019 Siemens Dualband Strategy
1/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 1 22-Feb-13
Siemens Dualband Strategy
Dr. Kolio Ivanov
ICN CA MR EE6
-
7/29/2019 Siemens Dualband Strategy
2/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 2 22-Feb-13
Outline
Introduction
Capacity Enhancement Methods /Overview
Dualband Network Architecture
Integration at BTSE level
Integration at Abis interface level
Integration at A interface level
Dedicated MSC
Key Aspects in Dualband Networks
Objectives for Traffic Management in Dualband Networks
Traffic Management in Idle Mode
General approach
camping on a cell
cell re-selection
-
7/29/2019 Siemens Dualband Strategy
3/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 3 22-Feb-13
Outline
Database Engineering for Idle Mode
cell selection re-selection cell selection example
cell re-selection example
Objectives for Traffic Management in Busy Mode
Traffic Management in Busy Mode
General approach
Siemens Hierarchical Cell Structure (HCS)
Multiple Coverage Layers in Dualband Networks
Siemens HCS in Dualband Networks
New parameters
Cell priorities
Functional description / Handover criteria / Definitions
Generation of target cell list
Ranking of target cell list
Typical parameter settings in a two-layer network
-
7/29/2019 Siemens Dualband Strategy
4/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 4 22-Feb-13
Outline
Dualband Capacity Evaluation / Example
Input parameters / assumptions Macro cell layer
GSM900 micro cell layer (contiguous on-street coverage)
GSM1800 pico cell layer (in-building coverage)
Total capacity in dense urban areas
Summary
-
7/29/2019 Siemens Dualband Strategy
5/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 5 22-Feb-13
Various phases ...
CoverageCapacity
New Applications
GPRS, HSCSD ...
Operator Evolution - Different concerns at various phases ...
- Coverage - Capacity - Cost - Quality - Environmental
IntroductionDriving forces in cellular mobile radio
-
7/29/2019 Siemens Dualband Strategy
6/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 6 22-Feb-13
Capacity Enhancement MethodsOptions for capacity enhancement in cellular radio networks
Capacityarea
sites
carrier
channels
channel
traffic
area
traffic
site
carriers
carriersper 1 MHz
TCH percarrier
systemload
licensedspectrum
traffic
area
traffic
channel
channels
carrier
carriers
bandwidth
1
cluster si zebandwidth
sites
area
frequencyreuse
BTSdensity
sizecluster
bandwidthbandwidth
carriers
sizecluster
carriers#total
site
carriers
-
7/29/2019 Siemens Dualband Strategy
7/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 7 22-Feb-13
Option
Method
traffic per
channel
channels
per carrier
cluster
sizeband
width
sites
per area
Directed retry, queueing X
City small cells X
RLC options (FH+PC+DTX) X
Concentric cells X
Hierarchical cell structure X
Multiband operation XHalf rate channels X
Adaptive antennas X X
Macro diversity X X
General Methods for Capacity Enhancement
5 carriers
per 1 MHz
frequencyreuse
8 for FR
16 for HR
systemload
GSM900GSM1800
BTSdensity
GSM
traffic
area
traffic
channel
channels
carrier
carriers
bandwidth
1
cluster si zebandwidth
sites
area
GSM
-
7/29/2019 Siemens Dualband Strategy
8/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 8 22-Feb-13
Capacity Enhancement MethodsQuantifying the capacity gains
Method
Radio link control (RLC)
Adaptive antennas
Macro diversity
Concentric cells
Directed retry
Advantages
+ GSM900/1800
inherent
+ gain with existing
sites, RFs, MSs
+ gain with existing
sites, RFs, MSs
+ gain with existing
sites, RFs, MSs
+ no HW effort
+ adaptation to traffic
distribution
Disadvantages
- potential technical
incompliance
with old MS types
- not yet available
- cost intensive
- very expensive
- no further system
evolution possible
- no further system
evolution possible
- impact on freq.
plan in 1-layer
network
Gain toCluster 4/12
50 - 250%
100 - 300%
50 - 80%
0 - 50%
25% (in HCS)
Gain toRLC
-
20 - 80%
---
---
15% (in HCS)
-
7/29/2019 Siemens Dualband Strategy
9/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 9 22-Feb-13
Capacity Enhancement MethodsQuantifying the capacity gains (continued)
Gain to
RLC
10 - 100%
---
100 * DR /
(200 - DR) %
prop. to add.
spectrum
Method
Hierarchical cell structure
City small cells
Half Rate
Dual band operation
Advantages
+ high flexibility
+ small sites
+ indoor coverage
+ high capacity
+ indoor coverage+ best suited for RLC
+ low radio network
infrastructure costs
+ low radio network
planning effort
+ guaranteed gain due
to add. resources
Disadvantages
- more complex
network planning
- many sites
- many sites
- gain depends on
DR penetration
- psychological
concerns
-operator must be
granted dual band
license
Gain to
Cluster 4/12
50 - 250%
proport. to
(1/cell radius)2reduction
100 * DR /
(200 - DR) %
prop. to add.
spectrum
-
7/29/2019 Siemens Dualband Strategy
10/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 10 22-Feb-13
Dual Band Network Architecture (1)Integration at BTSE Level
Highlights site sharing, BTSE-rack sharing, antenna sharing
dual band capable BSCs
fully supported by Siemens GSM900/1800 equipment
BSC900/1800
MSC
BTS
900/
1800
BTS
900/
1800
BTS
900/
1800
BTS
900/
1800
MSC
BSC900/1800
BSC900/1800
BSC900/1800
BTS
900/
1800
BTS
900/
1800
BTS
900/
1800
BTS
900/
1800
integration
at BTSE level
-
7/29/2019 Siemens Dualband Strategy
11/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 11 22-Feb-13
Dual Band Network Architecture (2)Integration at Abis-Interface Level
BSC900/1800
MSC
BTS
1800
BTS
1800
MSC
BSC900/1800
BSC900/1800
BSC900/1800
BTS
1800
BTS
1800
Highlights site sharing, antenna sharing, fixed lines sharing
dual band capable BSCs
fully supported by Siemens GSM900/1800 equipment
integrationat A
bis
-IF level
BTS
900
BTS
900
BTS
900
BTS
900
-
7/29/2019 Siemens Dualband Strategy
12/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 12 22-Feb-13
Dual Band Network Architecture (3)Integration at A-Interface Level
Highlights
site sharing, antenna sharing, fixed line sharing
multi-vendor capability supported by standardized A-Interface
fully supported by Siemens GSM900/1800 equipment
MSC MSC
integration at A-IF level
BSC1800
BSS
vend
orA
BSS
vend
orB
BTS
1800
BTS
1800
BTS
1800
BTS
1800
BSC1800
BTS
900
BTS
900
BTS
900
BTS
900
BSC900
BSC900
BSS
vend
orA
BSS
vend
orB
-
7/29/2019 Siemens Dualband Strategy
13/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 13 22-Feb-13
Dual Band Network Architecture (4)Dedicated GSM900/1800 MSCs
MSC1800
BSS
vendorA
BSS
vendorB
Highlights
site sharing, antenna sharing, fixed line sharing
multi-vendor capability
independent frequency layer network expansion (maximum flexibility)
contiguous GSM1800 coverage easy to implement with dedicated MSC
fully supported by Siemens GSM900/1800 equipment
MSC900
BTS
900
BTS
900
BTS
900
BTS
900
BTS
1800
BTS
1800
BTS
1800
BTS
1800
BSC900
BSC1800
BSC900
BSC1800
-
7/29/2019 Siemens Dualband Strategy
14/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 14 22-Feb-13
Key Aspects in Dual Band NetworksIssues and Options for Macro Cells
Site-to-site distance in capacity driven GSM900 networks ranging 300-800m
contiguous GSM1800 coverage easily built-up by GSM900 site sharing
Contiguous GSM1800 coverage in congestedcentral business areas
smooth expansion for medium and long termcapacity demands
mobiles remain served by their proper layer
substantially reduced signaling load comparedto hot spot coverage
capacity gain
GSM900 layer
GSM1800 layer
Coverage drivenInter-band HOs
OccasionalInter-band HOs
GSM900 layer
GSM1800 hot spots
Coverage drivenInter-band HOs
Capacity driven
Inter-band HOs
Hot spot coverage by GSM1800
only short term capacity relief
higher signaling load due to inter-band HOs(and potential location updates) at GSM1800 cellborders
capacity loss
s
-
7/29/2019 Siemens Dualband Strategy
15/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 15 22-Feb-13
Key Aspects in Dual Band NetworksIssues and Options for Micro/Pico Cells
Additional 1800 MHz spectrum facilitates deployment of micro cells for outdoor pedestrian coverageand pico cells for indoor coverage in high traffic business districts
Isolated/contiguous GSM1800 micro/pico cells
embedded incontiguous GSM1800 macro layer dual band mobiles remain served by the
GSM1800 layers
benefits of hierarchical cell structures fullyexploited
substantially reduced signaling loadcompared to hot spot scenario
maximum spectrum efficiency
GSM900macro layer
GSM1800 microcell hot spots
Coverage drivenInter-band HOs
Capacity drivenInter-band HOs
Isolated (hotspot) GSM1800 micro cellsembedded in GSM900 macro layer
only short term capacity relief
higher signaling load due to inter-band HOs(and potential location updates) at GSM1800 cellborders
capacity loss
GSM1800
macro layer
All inter-layer
HOs in GSM1800
GSM1800micro layer
GSM1800
pico layer
s
-
7/29/2019 Siemens Dualband Strategy
16/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 16 22-Feb-13
Key Aspects in Dual Band NetworksTraffic Management Objectives
By default
single band GSM900 users are served by
GSM900 network layers
Dual band GSM900/1800 users:
1. shall be kept in the GSM1800 network both in
idle mode and connected mode as long as
sufficient radio coverage is provided by the
GSM1800 network
2. should camp and establish a call on GSM1800
cells
3. should be handed down from GSM900 toGSM1800 cells whenever possible
4. should be handed up from GSM1800 to
GSM900 cells only if necessary
GSM900 layer
SB 900
GSM900 layer
GSM1800 layer
SB900
DB
1 2
DB
DB
4
3
s
-
7/29/2019 Siemens Dualband Strategy
17/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 17 22-Feb-13
Maximum capacity benefit from 1800 MHz spectrum achieved by
directing dual band mobiles towards the 1800MHz layer
dual band mobiles shall camp on 1800MHz cells
dual band mobiles shall reselect 1800MHz cells
any calls are established on the GSM1800 layer
congestion relief in GSM900 layer
optimum spectrum utilization
Objectives for Traffic Management in Idle Mode
s
-
7/29/2019 Siemens Dualband Strategy
18/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 18 22-Feb-13
In idle mode
cell selection is based on the C1 criterion and cell priority
cell reselection is based on the C2 criterion taking into account the
mobile speed
Cell Selection and Cell Reselection
Performed by MS
Controlled by parameters broadcast on the BCCH carrier of each
cell
Traffic Management in Idle ModeGeneral Approach
s
-
7/29/2019 Siemens Dualband Strategy
19/42
s
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 19 22-Feb-13
Parameters affecting Cell Selection for phase 2 MS (dual band)
Acc. to GSM 05.08 a cell can be assigned 1 out of 2 priorities:
normal priority: CBQ = 0 or low priority: CBQ = 1
MS camps on a suitable cells (C1>0) of low priority (CBQ = 1)
if there are no suitable cells of normal priority (CBQ = 0)
C1 = (RXLEV - RXLEV_ACCESS_MIN) - max(MS_TXPWR_CCH - P)
Traffic Management in Idle ModeCamping on a cell
s
-
7/29/2019 Siemens Dualband Strategy
20/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 20 22-Feb-13
Parameters affecting Cell Reselection for phase 2 MS (dual band)
C2 criterion
CRESOFF = Defines an offset to encourage or discourage a mobile to select this cellwhile it is camping on another cell
TEMPOFF = Temporary offset
PENTIME = Penalty Time
Acc. to GSM 05.08 a cell reselection shall take place, if:
C2 (non-serving suitable cell (C1>0)) > C2 (serving cell)
for at least 5 seconds
C2 (non-serving suitable cell (C1>0)) > C2 (serving cell)
+ CELLRESHYST
for at least 5 seconds, if non-serving cell in differentLocation Area
C2 = C1 + CRESOFF - TEMPOFF for TPENTIMEC2 = C1 + CRESOFF for T > PENTIMEC2 = C1 - CRESOFF for PENTIME = 31
Traffic Management in Idle ModeCell reselection
s
-
7/29/2019 Siemens Dualband Strategy
21/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 21 22-Feb-13
To encourage dual band MS to preferably camp on GSM1800 cells
qualify GSM1800 cells as high priority: CBQ = 0, CBA = 0
qualify GSM900 cells as low priority: CBQ = 1, CBA = 0
Note: In case of potential impact on single band 900 phase 2 MS (it takes too long time
to access the network?) qualify both GSM900 and GSM1800 cells as normal priority
cells: CBQ = 0.
To encourage dual band MS to preferably reselect GSM1800 cells set CRESOFF(GSM1800 cells) >> CRESOFF(GSM900 cells)
(e.g. CRESOFF(GSM1800 cells) = 30 dB CRESOFF(GSM900 cells) = 0 dB)
or, alternatively set for GSM900 cells PENTIME = 31
-> C2 = C1 - CRESOFF
reduceCELLRESHYST broadcast by GSM900 cells if neighbor GSM1800 cells are in
a different Location Area
increaseCELLRESHYST broadcast by GSM1800 cells if neighbor GSM900 cells are
in a different Location Area
Data Base Engineering for Idle ModeCell selection re-selection
s
-
7/29/2019 Siemens Dualband Strategy
22/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 22 22-Feb-13
DB-MS
switch ON
CBQ = NormalCBA = No
C1 = 20
Cell A Cell B
Cell A Cell B
CBQ = LowCBA = NoC1 = 50
CBQ = LowCBA = NoC1 = 30
CBQ = NormalCBA = NoC1 = 10
Camp
on
cell B
1800
Cell selection
Moving MS
Note: All dual band mobiles are Phase 2 mobiles
GSM900 layer
GSM1800 layer
Data Base Engineering for Idle ModeCell selection / Example
s
-
7/29/2019 Siemens Dualband Strategy
23/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 23 22-Feb-13
DB-MS
is ON
C1 = 10CRO = 50TMPO = 0C2 = 60
C1 = 40CRO = 0TMPO = 0C2 = 40
C1 = 40CRO = 0TMPO = 0C2 = 40
C1 = 15CRO = 50TMPO = 0C2 = 65
Camped
on B1800
Cell RE-selection
Moving MS
Note: All dual band mobiles are Phase 2 mobiles
GSM900 layer
GSM1800 layer
Cell A Cell B
Cell A Cell B
Data Base Engineering for Idle ModeCell re-selection / Example
s
-
7/29/2019 Siemens Dualband Strategy
24/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 24 22-Feb-13
Note: All dual band mobiles are Phase 2 mobiles
Maximum capacity benefit from GSM1800 spectrum achieved by
directing dual band mobiles towards the 1800MHz layer
dual bandMS should hand-over to GSM1800 cells whenever possible
dual band MS should be kept in the GSM1800 layer as long as possible
dual band MS should hand-over to GSM900 cells only if necessary
minimize signaling overhead due to inter-band handovers
free up capacity in the GSM900 layer
optimum spectrum utilization
Objectives for Traffic Management in Busy Mode
s
-
7/29/2019 Siemens Dualband Strategy
25/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 25 22-Feb-13
GeneralTo direct dual band mobiles towards the GSM1800 layer
provide the network with information on MS multi band capabilities by
enabling Early Class Mark Sending Option on both 900 and 1800 layers
(e.g. set parameter: EARCLM = TRUE)
MS sends to the network during call set-up the Mobile Station Class Mark 3 IE
encourage the dual band MS to include in the measurement reports for HO
purposes preferably cells from the GSM1800 band by appropriately setting the
parameter for MULTIBAND_REPORTING
e.g. set parameter: NMBULA = 3 on GSM900, and NMBULA = 2 on GSM1800 cells
Traffic Management in Busy ModeGeneral Approach
s
-
7/29/2019 Siemens Dualband Strategy
26/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 26 22-Feb-13
The HCS technique provides an optimum capacity in dual band networks by
optimizing the distribution of traffic on up to 15 layers
HCS is capable of taking into account the mobile speed
The Mobile Speed Sensitive HO functionality shifts stationary and slow-moving traffic to
indoor (pico) or micro cell layers
improved spectrum utilization and call quality, reduced congestion in the macro cell layers
The Mobile Speed Sensitive HO functionality steers and keeps fast-moving traffic to
macro or umbrella cell layers
enhanced grade of service, reduced signaling load in the fixed network
Take advantage of Siemens Hierarchical Cell Structures (HCS)
Traffic Management in Busy ModeSiemens Hierarchical Cell Structure
s
-
7/29/2019 Siemens Dualband Strategy
27/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 27 22-Feb-13
Multiple Coverage Layers in Dual Band Networks
Macro Cell GSM1800
Radio Coverage Layer 4
Umbrella Cell GSM900
Radio Coverage Layer 6
Macro Cell GSM900
Radio Coverage Layer 5
Micro Cell GSM900
Radio Coverage Layer 3
Micro Cell GSM1800
Radio Coverage Layer 2
Pico Cell GSM1800
Radio Coverage Layer 1
s
-
7/29/2019 Siemens Dualband Strategy
28/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 28 22-Feb-13
Siemens-HCS in Dual Band NetworksNew Parameters
Serving Cell
PriorityLayerServingCell = PL
Value Range: 0 ... 15 step 1
Neighbor Cell - MSSHO deactivated
PriorityLayerNeighbourCell = PLNC(n) Value Range: 0 ... 15 step 1
Neighbor Cell - MSSHO activated
Handover DelayTimer not yet started or still running
PenaltyPriorityLayerNeighbourCell = PPLNC(n)
Value Range: 0 ... 15 step 1
Handover Delay Timer is expired
PriorityLayerNeighbourCell = PLNC(n)
Value Range: 0 ... 15 step
s
-
7/29/2019 Siemens Dualband Strategy
29/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 29 22-Feb-13
Siemens-HCS in Dual Band NetworksNew Parameters
Enabling HCS Feature on cell base
HIERC=True or False
Switching between two alternative ranking methods for imperative
and forced HO
hierarchicalCellRankFlag = HIERF Value Range: RANK0 orRANK1
Applying an offset to the minimum level criterion with ranking
method RANK1 for imperative and forced HO
LevelOffsetNcell = LEVONC
Value Range: 0 ... 31 (dB) for BR 3.7
Value Range: 0 63 (dB) for BR 4.0
s
-
7/29/2019 Siemens Dualband Strategy
30/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 30 22-Feb-13
Siemens-HCS in Dual Band NetworksCell priorities
Different Cell LayersCell Priority
LOW
HIGH
Priority Value
15
0
s
-
7/29/2019 Siemens Dualband Strategy
31/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 31 22-Feb-13
Imperative Handover
Quality
Level
Distance
Better Cell Handover
Sufficient level (lowest HO margin, e.g. 0 (-24dB))
Power Budget
Forced Handover
Congestion
Siemens-HCS in Dual Band NetworksFunctional description / Handover criteria
s
-
7/29/2019 Siemens Dualband Strategy
32/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 32 22-Feb-13
Siemens-HCS in Dual Band Networks
Functional description / Definitions
Definition of Better Cell Value - BCV
Neighbor Cells with in-active MSSHO
BCV(n) = PBGT(n) - HO_MARGIN(n)
Neighbor Cells with active MSSHO
Delay Timer not yet started or still running
BCV(n) = PBGT(n) - (HO_MARGIN(n) + HO_STATIC_OFFSET(n))
Delay Timer is expired
BCV(n) = PBGT(n) - (HO_MARGIN(n) + HO_STATIC_OFFSET(n) -
HO_DYNAMIC_OFFSET(n))
s
-
7/29/2019 Siemens Dualband Strategy
33/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 33 22-Feb-13
HCS Disabled HCS Enabled
Better Cell
Handover RXLEV_NCELL(n) > RXLEV_MIN(n) +
MAX(0,Pa)
and
BCV(n) > 0
RXLEV_NCELL(n) > RXLEV_MIN(n) +
MAX(0,Pa)
andBCV(n) > 0
andPLNC(n) PL
Imperative
Handover
RXLEV_NCELL(n) > RXLEV_MIN(n) +
MAX(0,Pa)
RXLEV_NCELL(n) > RXLEV_MIN(n) +
MAX(0,Pa)
ForcedHandover
RXLEV_NCELL(n) > RXLEV_MIN(n) +MAX(0,Pa) +
FHO_RXLEV_MIN_OFFSET(n)
RXLEV_NCELL(n) > RXLEV_MIN(n) +MAX(0,Pa) +
FHO_RXLEV_MIN_OFFSET(n)
Potential HO candidate cells satisfy the following conditions
Siemens-HCS in Dual Band NetworksGeneration of Target Cell List
s
-
7/29/2019 Siemens Dualband Strategy
34/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 34 22-Feb-13
Handover Type HCS Disabled HCS Enabled
HIERF = RANK0 HIERF = RANK1
1.Sublist:
BCV(n) > 0
1.Sublist:
RXLEV_NCELL(n) >
RXLEV_MIN(n) + MAX(0,Pa)
+ LEV_OFFSET_NCELL(n)
2. Sublist:
BCV(n) 0
2.Sublist:
RXLEV_NCELL(n) RXLEV_MIN(n) + MAX(0,Pa)
+ LEV_OFFSET_NCELL(n)
Imperative and
Forced
Handover
Descending
Order
of BCV(n)
1. Descending order of priority PLNC(n)
2. Descending Order of BCV(n) for equal PLNC(n)
Better Cell
Handover
Descending
Order
of BCV(n)
1. Descending order of priority PLNC(n)
2. Descending Order of BCV(n) for equal PLNC(n)
LEV_OFFSET_NCELL(N): useful to move high priority cells to the 2nd sub-list, thus giving
chance to low priority cells (macro cells) to pop up in the target cell list
Siemens-HCS in Dual Band Networks
Ranking ofTarget Cell List
s
-
7/29/2019 Siemens Dualband Strategy
35/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 35 22-Feb-13
Siemens-HCS in Dual Band NetworksTypical Parameter Settings in a 2-Layer Macro Cell Network
Intended to push and keep dual band MS traffic in GSM 1800 layer
Parameter GSM900/GSM1800 Description
ENACLA TRUE TRUE early class mark enabled
NMBULA 3 2 min. number of reported BCCH from other
band
HIERC TRUE TRUE HCS enabled in both layersHIERF RANK0 RANK0 Ranking method: 1-st sublist BCV>, 2nd sublist
BCV
-
7/29/2019 Siemens Dualband Strategy
36/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 36 22-Feb-13
Dual Band Capacity Evaluation (example)Input Parameters / Assumptions
Bandwidth: GSM900 9.6 MHz (48 carriers),
GSM1800 10.4 MHz (52 carriers)
Indoor coverage
2% Grade of Service (GOS)
High quality network performance: less than 2% FER @ 90% with Frequency Hopping, Power
Control and DTX
BCCH re-use scheme on macro layer: 4/12
Outdoor micro-cellular re-use factor (contiguous coverage): 6
In-building (pico-cellular) re-use factor (3-dimensional)
4 in horizontal plane, i.e. 4-building re-use pattern
2 in vertical direction, i.e. 2-floor re-use pattern
Number of TRXs per micro / pico BTS: 2
Orthogonal frequency groups in pico, micro and macro cell layer
s
-
7/29/2019 Siemens Dualband Strategy
37/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 37 22-Feb-13
Dual Band Capacity Evaluation (example)Macro cell layer
Expansionphase
GSM900(48 carriers)
GSM1800(52 carriers)
Total
traffic
re-usea) BCCHb) TCH
BTS siteconfiguration
Erlangpermacrosite
re-usea)BCCHTCH
BTS siteconfiguration
Erlangpermacrosite
Erlangper
macro
site
start-up:GSM900
a) 4/12b) 4/12
4/4/4 65.7 - - - - - - - - - 65.7
introduceGSM1800
a) 4/12b) 4/12
4/4/4 65.7 a) 4/12b) 4/12
4/4/4(4 sparecarriers)
65.7 131.4
tight reuse TCHGSM900/1800
(*)a) 4/12b) 6
5/5/5 84.9 a) 4/12b) 6
5/5/5 84.9 169.8
(*) 12 GSM900 and 16 GSM1800 carriers reserved for micro/ pico-cellular, resp.
s
D l B d C it E l ti ( l )
-
7/29/2019 Siemens Dualband Strategy
38/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 38 22-Feb-13
Dual Band Capacity Evaluation (example)Macro cell layer (continued)
Total traffic Capacity Subscribers
(macro layer)
Expansion phase
Erlang per
macro site
Erlang per
sqkm
Subscribers
per sqkm
start-up:GSM900
65.7 153 6120 3060
introduce
GSM1800
131.4 306 12240 6120
tight reuse
GSM900/1800(* )169.8 395 15800 7900
Assumptions: site-to-site distance: 0.7 km (site area = 0.43 sqkm)
traffic model: 25 / 50 mErl/subs
(*) 12 GSM900 and 16 GSM1800 carriers reserved for micro/ pico-cellular, resp.
s
D l B d C i E l i ( l )
-
7/29/2019 Siemens Dualband Strategy
39/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 39 22-Feb-13
Dual Band Capacity Evaluation (example)GSM900 micro cellular (contiguous on-street coverage)
Assumptions: 12 GSM900 carriers reserved for micro-cellular
re-use: 6
TRX per micro BTS: 2
site-to-site distance: 200 m
micros per macro site: 11
traffic model: 50/100 mErl/subs
blocking: 2%, without DR2%, with DR
DR = Directed Retry
traffic per micro: 8.2 Erl10 Erl
capacity in micro layer: 205 Erl/sqkm250 Erl/sqkm
subscribers per sqkm in micro layer: 4100 / 20505000 / 2500
s
D l B d C it E l ti ( l )
-
7/29/2019 Siemens Dualband Strategy
40/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 40 22-Feb-13
Dual Band Capacity Evaluation (example)GSM1800pico cellular (inbuilding coverage)
Assumptions: 16 GSM1800 carriers reserved for pico-cellularhorizontal plane re-use: 4
vertical direction re-use: 2
TRX per micro BTS: 2
number of office buildings: 50 per sqkm
area per floor: 3000 sqmnumber of floors: 40
number of sites on floor: 1 (at minimum)
blocking: 2%
traffic model: 50 / 100 mErl/subs
traffic per site: 8.2 Erl capacity: 16400 Erl/sqkm
subscribers per sqkm in pico layer: 328000 / 164000
s
-
7/29/2019 Siemens Dualband Strategy
41/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 41 22-Feb-13
Dual Band Capacity Evaluation (example)Total capacity in dense urban areas
Macro Cell
GSM900
Micro Cell
GSM900
GSM900 (macro + micro layer) total capacity
402 Erl/sqkm (without DR)
447 Erl/sqkm (with DR)
total subs per sqkm with DR
12900 (@ 25 /50 mErl)
6450 (@ 50/100 mErl)
GSM1800 (macro + pico layer) total capacity
16'600 Erl/sqkm
total subs per sqkm336'000 (@ 25/50 mErl)
168'000 (@ 50/100 mErl)
Macro Cell
GSM1800
Pico Cell
GSM1800
s
Dual Band Capacity Evaluation (example)
-
7/29/2019 Siemens Dualband Strategy
42/42
Dr. Ivanov, Siemens Dualband Strategy.ppt
slide 42 22-Feb-13
Dual Band Capacity Evaluation (example)Summary
GSM 900
447198153
402
100
1000
10000
100000
macro tight re-use micro cells directed
retry
Erl/sqkm
GSM 900/1800
17045
645395306
600
100
1000
10000
100000
macro tight re-
use
micro
cells
directed
retry
pico
cells
Erl/sqkm
GSM 1800
198153
16400
100
1000
10000
100000
macro tight re-use pico cells
Erl/sqkm
GSM 900/1800
348800
208001580012240 19900
10000
100000
1000000
macro t ight re-
use
micro
cells
directed
retry
pico
cells
sub
srcibers/sqkm
macro: 25 mErl/subs
micro: 50 mErl/subs
pico: 50 mErl/subs