dual_band_features

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BSSPAR1: Chapter 9 Dual Band Features


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Module Objectives

• Explain how additional frequency bands are taken into use in a dual band network

• Describe shortly the architecture of a dual band network

• Explain in detail the direct access to desired layer / band mechanism (DADL/B)


890-915 MHz 935-960 MHz

1710-1785 MHz 1805-1880 MHz

BSC Supports: GSM 900/1800 (Europe/ETSI) or GSM 800/1800 or GSM 800/1900 (USA/ANSI) Usually lower signal level for GSM 1800 cell -> MS camps on GSM 900 cell -> must be set less attractive -> or MS must be handed over to GSM 1800 cell BTS equipment Flexi, Ultra, Metro, Talk, Insite

Capacity Expansion (Dual Band)

Note! RG20 feature Merged P-& E-GSM900


890-915 MHz 935-960 MHz

Classical GSM 900 (P-GSM) + Extended GSM 900 (E-GSM) PGSM and EGSM band can be configured and used in the same BTS object (requires that Common BCCH option is active)

880- 890

925- 935

E E P P

Capacity Expansion (Tri Band)


Capacity Expansion MS Capability indication

• MS indicates its frequency band capabilities and power capabilities in MS Classmark3 information element

• Information made available to BSS:

• During call setup : Classmark Change message

• Inter-BSS handover: Handover Request message from MSC

• Intra-BSS handover: BSS maintains the information


Handover for multi vendor equipment Nokia GSM 900 <-> Nokia GSM 900 Nokia GSM 900 <-> Nokia GSM 1800 Nokia cell <-> other GSM 900 cell (controlled by MSC)

900 1800

Dual band MS

900

NSN BSS

MSC

other BSS

900

DX 200

CM3

Parameter multiBandCell (DBC) Y/N indicates cell as dual band cell multiCellBandReporting (MBR) 0..3 number of adjacent dual band cells taken into account for measurement report earlySendingIndication (ESI) Y/N enables MS to send classmark 3 message as early as possible

Capacity Expansion (Dual Band Network Operation)


Traffic Management

C2 Parameter Direct Access to

Desired Layer/Band Umbrella or

PBGT handover

Adjacent Cell Priorities & Load Factors

Advanced Multilayer

Handling (AMH)

FMMS Detect

Idle Mode Call Setup Dedicated mode


DADL/B Functionality

900 Macro

900 Micro

1800

TCH allocation during call set up (SDCCH handover)

Highest Priority

2nd priority 2nd priority

3rd priority

MS camped on 900 microcell

MS camped on 900 macrocell

900 Micro

1800

Highest Priority

• Only Intra-BSC DADL/B handovers possible

• Queuing is not allowed for DADL/B handover


cell load = 100 %

Btsloadthreshold < cell load < 100 %

Cell load <= btsloadthreshold

DR initiated with / without queuing

DADL/B

initiated

TCH allocated

from serving

cell

DADL/B Triggering

MO

Class

Abbreviated

Name

Range And Step Description Default

value

BSC - MML

Name

ADCE dadlbTargetC

ell

Y, N Indicates the cell as a potential target for DADL/B. N DADL

BTS btsLoadThres

hold

0...100 %, step 1 % Threshold for the BTS to be considered overloaded to

trigger a HO from SDCCH to the TCH of other band

70% BLT


Estimation of RX levels of adjacent DADL/B target cells

Ranking of adjacent cells as usual on the basis of hoPriorityLevel, hoLoadFactor, btsLoadThreshold

Check of adjacent cells with condition AV_RXLEV_NCELL > hoLevelUmbrella

Adjacent DADL/B cell with sufficient RX level

Yes No

DADL/B handover See next slide

Cell load exceeds btsLoadThreshold during call set up but not 100 %

DADL/B (Execution)


Neighbour cell reporting

DADL/B

triggered

MinTimeLimitDR

DADL/B handover

success

DADL/B handover

failure

DADL/B handover

candidate selection fails

TCH allocated from DADL/B

target cell

MaxTimeLimitDR

TCH allocation from

serving cell

Serving cell in real TCH congestion.

DR attempt with or without queuing

Maximum allowed time for

DADL/B handover expires

Time

TCH allocation from

serving cell

Serving cell in real TCH congestion.

DR attempt with or without queuing

DADL/B uses same

timers as directed

retry

DADL/B Timing

Mobile

dual_band_features