UMTS 900 Guidelines v4

UMTS 900 – Guidelines

29-11-2011

Radio Design Team

Content

U900 – Initial Strategy

U900 – Design Options

U900 – Guidelines 3 stages

Neighbouring strategy

U900 Optimization for Coverage, Performance, Capacity.

C3- Company ConfidentialV0.7Technical Options

U900 – Initial Strategy

U900 layer used to provide additional coverage and capacity.

Proposal is to use U900 for coverage first, then capacity.

Where there is U900/U2100 coverage, UEs are directed to idle and access the network via the U2100 layer (qOffsets or HCS).

Normal load situations:Traffic will be distributed evenly between U2100 co-sectored cells.

High load situations:U900 cells will be used to relieve traffic from the co-sectored U2100 cells.

The strategy will reserve capacity on the U900 layer for:UEs with ONLY U900 coverage (e.g. indoor/rural coverage provided by the extra penetration/pathloss of U900) to reduce the risk of overloading the cell.Any free capacity is the available when the load increases on the U2100 cells.


U900 – Idle Mode Initial Strategy


U900 – Initial Inter frequency Load Sharing (IFLS) Coverage Relations


Design Options


Guidelines UMTS 900 – Stage One

Stage One - Initial Neighbour Planning:

1. Plan initial neighbour lists for UMTS900 and surrounding area.

2. Using visual inspection, planning tools and existing statistics.

3. Includes:

Clean 2G BA lists.Clean 3G inter-frequency neighbours.Plan 3G UMTS900 <> UMTS900 neighbours.Plan 3G UMTS900 <> UMTS2100 neighbours.Plan 2G IRAT neighbours.Audit and Plan idle mode parameters to meet design.


Guidelines UMTS 900 – Stage two

Stage Two – Bringing Cluster Live

1. Bringing Cluster Live and Initial Performance Monitoring/Optimisation.

2. Powering up Cluster.

Low power starting point, steadily increasing while maintaining performance.

3. Updating neighbour lists based on W-NCS and GW-NCS.

DCR is the main concern.Increase traffic on 3G with correct 2G to 3G relations for idle mode reselection.


Guidelines UMTS 900 – Stage three

Stage Three – Optimisation

Depending on U900 traffic, site can be further optimised for:

Coverage

New traffic, extending macro range or indoor coverage.This is the default design.

Capacity

Treat as a new carrier to relieve congestion.

Performance.

Low traffic sites allow traffic to be pushed to UMTS900 and benefit from greater HS performance, throughput


Guidelines UMTS 900 – New Site/ Clusters


Neighbouring Strategy


Idle and Handover Strategy – Summary (I)

Currently in VF-UK Inter frequency handover is de-activated, the Design has to take into consideration that it will be turned back on.

Devices are capable of monitoring three 3G frequencies plus IRATaccording to 3GPP specs. This applies to the SIB11 block rather than what the UE is actually measuring at the time.

UEs cannot be predicted: Reports of UEs continuously restarting when entering a cell with greater than 3 frequencies.Some UEs will filter out forth frequencies or ignore those that they do not support.For handover Ericsson RNCs will filter out in the measurement reports frequencies not supported by the UE.


Idle and Handover Strategy – Summary (II)

Clear strategy to maximise the possibility of a inter frequency handover. Define inter frequency cells of the same sector in a neighbouring site it is reducing how many tiers of neighbours you can define, and thus increasing DCR.Define more than three frequencies then it is wasting space in the neighbour list as these may be ignored and thus DCR will increase.Chose F1 as the one target frequency for inter frequency handover outside of the co-site for U900 and U2100. F1 has U900 as the target frequency for inter frequency handover.

All frequencies have to have relations to Femto cells.Thus as this is on F3, then for F1, F2, and U900 Femtos represent one of the allowed frequencies.

Coverage relations are defined between all cells on a sector.A coverage relation can exist without a UTRAN relation.


UMTS 2100 2 carries- Camping in Idle Mode (I)

CellA_GSM CellB_GSM CellD_GSM

F1_HSPA/R99 F1_HSPA/R99 F1_HSPA_R99

F2_HSPA/R99 F2_HSPA/R99

Intra-Freq cell reselection

Inter-Freq cell reselection

Inter-RAT cell reselection

Edge of the cell

FEMTO / F3Femto Cells


UMTS 2100 2 carries - Camping in Idle Mode (II)

1. UE can camp ALL carriers equally.

2. Intra Frequency F1 F1, F2 F2.

3. Inter Frequency re-selection:F1 F2 on the co-sector cellsF1 FemtoF2 F1 on non co-sectors cellsF2 Femto

4. Inter frequency reselection base on coverage take place at the edge of each carrier.

5. Inter RAT reselection: – GSM F1– GSM Femto– F2 GSM

.


UMTS 2100 2 carries in Connected Mode (I)




Intra-Freq Handover

Inter-Freq Handover

Inter-RAT Handover

Inter-Freq Load Share HO

Edge of the cell


UMTS 2100 2 carries in Connected Mode (II)

1. Intra Frequency handover F1 F1, F2 F2.

2. Inter Frequency Load Share handover, except inter frequency handover base on coverage, is enabled between the co-sector cells (F1&F2).

3. Inter Frequency :F1 F2 on the co-sector cellsF2 F1 on non co-sectors cells

4. Inter frequency handover base on coverage take place at the edge of each carrier.

5. All UMTS carries can handover to GSM, but GSM to UMTS handover is not allowed to avoid ping pong inter RAT handover

F1 GSMF2 GSM

Note:

Currently E/// is set to GSM prefer, inter frequency disable.

NSN and Huawei can measure simultaneously inter frequency and GSM.


Radio Design Team 19/08/2011

UMTS 2100 3 carriers - Camping in Idle Mode (I)




Intra-Freq cell reselection

Inter-Freq cell reselection

Inter-RAT cell reselection

F3_HSPA/R99

Edge of the cell

FEMTO/ F3Femto Cells F3_HSPA/R99

F2_HSPA/R99



UMTS 2100 3 carriers- Camping in Idle Mode (II)

1. All UMTS Carriers can support R99 and HSPA.

2. Intra Frequency F1 F1, F2 F2, F3 F3&Femto.

3. UE can camp ALL carriers equally.– F1 F2 on the co-sector cells– F1 F3 on the co-sector cells– F1 Femto– F2 F1 on non co-sectors cells– F2 Femto– F3 F1 on non co-sectot cells– F3 Femto

4. Inter RAT reselection: – GSM F1– GSM Femto– F2 GSM– F3 GSM



UMTS 2100 3 carriers- Camping in Connected Mode (I)




Intra-Freq HO

Inter-Freq HO

Inter-RAT HO

F3_HSPA/R99

Edge of the cell

F3_HSPA/R99

F2_HSPA/R99




UMTS 2100 3 carriers in Connected Mode (II)1. Intra Frequency handover F1 F1, F2 F2, F3 F3.2. Inter Frequency Load Share handover is enabled between the co-sector cells

(F1&F2&F3).3. Inter Frequency:

1. F1 F2 on the co-sector cells2. F1 F3 on the co-sector cells3. F2 F3 on the co-sector cells4. F2 F1 on non co-sectors cells5. F3 F1 on non co-sectors cells

4. Inter frequency handover base on the coverage only take place at the edge of each carrier.


– F1 GSM– F2 GSM– F3 GSM

Note: Currently E/// is set to GSM prefer, inter frequency disable.NSN and Huawei can measure simultaneously inter frequency and GSM.



UMTS 2100 2 carries + U900 1 carrier Camping in Idle Mode (I)


U900 U900


F2_HSPA/R99 F2_HSPA/R99 F2_HSPA/R99

Intra-Freq Neighbor

Inter-Freq Neighbor

Inter-RAT Neighbor

FEMTO

Femto Cells

Note: According 3GPP specs devices are capable of monitoring only three 3G frequencies plus GSM..



UMTS 2100 2 carries + U900 1 carrier Camping in Idle Mode (II)1. All UMTS Carriers can support R99 and HSPA.

2. At the moment UE bias towards 2100.

3. Intra Frequency F1 F1, F2 F2, U900 U900.

4. Inter-Freq reselection:According 3GPP specs devices are capable of monitoring only three 3G frequencies plus GSM.F1 U900F1 FemtoF2 F1, FemtoU900 Femto

5. Inter RAT reselection: GSM F1GSM U900GSM FemtoF2 GSM



UMTS 2100 2 carries + U900 1 carrier Mobility in Connected Mode (I)


U900 U900



Intra-Freq handover

Inter-Freq HO

Inter-RAT handover


Edge of the cell

Edge of the cell



UMTS 2100 2 carries + U900 1 carrier Mobility in Connected Mode (II)

1. All UMTS Carriers can support R99 and HSPA.

2. Intra Frequency F1 F1, F2 F2, U900 U900.

3. Inter-Freq:According 3GPP specs devices are capable of monitoring only three 3G frequencies plus GSM.F1 U900F2 F1

4. Inter-Freq Load Share handover is defined in the co-sector cells.


– F1 GSM– F2 GSM

Note:





UMTS 2100 3 carries + U900 1 carrier Camping in Idle Mode (I)


U900 U900



Intra-Freq Neighbor

Inter-Freq Neighbor

Inter-RAT NeighborF3_HSPA/R99 F3_HSPA/R99FEMTO / F3

Femto Cells



UMTS 2100 3 carries + U900 1 carrier Camping in Idle Mode (II)1. All UMTS Carriers can support R99 and HSPA.2. At the moment UE bias towards 2100.3. Intra Frequency F1 F1, F2 F2, F3 F3&Femto, U900 U900.4. Inter-Freq reselection:

According 3GPP specs devices are capable of monitoring only three 3G frequencies plus GSM.F1 U900F1 F3 on the co-sectors cellsF1 FemtoF2 F1,F3, FemtoF3 F1 on non co-sector cellsF3 F2U900 Femto

5. Inter RAT reselection: GSM F1GSM U900GSM FemtoF2 GSMF3 GSM



UMTS 2100 3 carries + U900 1 carrier Mobility in Connected Mode (I)


U900 U900



Intra-Freq handover

Inter-Freq HO

Inter-RAT handover


Edge of the cell




UMTS 2100 3 carries + U900 1 carrier Mobility in Connected Mode (II)

1. Intra Frequency F1 F1, F2 F2, F3 F3, U900 U900.

2. Inter-Freq:According 3GPP specs devices are capable of monitoring only three 3G frequencies plus GSM.F1 F3 on the co-sectors cellsF2 F1,F3F3 F1 on non co-sector cellsF3 F2

3. Inter-Freq Load Share handover is defined in the co-sector cells.


– F1 GSM– F2 GSM– F3 GSM

Note:




U900 - Optimization


Optimization - Idle Mode Parameters

Define qOffsets correctly for Inter/Intra-frequency neighbour relations on the site:

All Intra-Frequency qOffset2sn=0.Inter-Frequency UMTS2100 UMTS2100 qOffset2sn = 0.Inter-Frequency UMTS2100 UMTS900 qOffset2sn = +50.Inter-Frequency UMTS900 UMTS2100 qOffset2sn = -50.Inter-Frequency UMTS2100 FEMTO qOffset2sn = -40.Inter-Frequency UMTS900 FEMTO qOffset2sn = -40


U900 – Optimization (I)

1. New Coverage/New Traffic:Base rollout design. Existing traffic is kept on U2100 layers, keeping U900 layer free for new traffic (e.g. New Indoor coverage). Stops new U900 layer soaking up traffic from surrounding areas and going into congestion during rollout and initial tuning.

2. Increased Coverage:Areas of high mobility where traffic would be served better if on the U900 layer. (e.g. coverage holes on Motorways, main roads).

3. Capacity:Sites where U2100 layers are more highly loaded than U900. Traffic is distributed evenly over all cells on the site.

4. Performance:Low traffic sites.Traffic is pushed to U900 to benefit from better HS performance due to better CQI, RSCP etc for a given location over U2100.


U900 – Optimization (II)


U900 – Optimization (III) – Recommended starting values

New Coverage/New TrafficSettings U2100:

dchIflsMarginCode = 0dchIflsMarginPower = 0hsIflsMarginUsers = 0

Settings U900:


Increased CoverageSettings U2100:


Settings U900:


CapacitySettings U2100:


Settings U900:


Performance (HS)Settings U2100:


Settings U900:



U900 – Coverage Relation – Initial Rollout Design

All co-sectored cells have two way coverage relations between all other cells in the sector.


U900 – Optimization - Coverage



U900 – Optimization – Performance (HS)



U900 – Optimization - Capacity



U900 – Optimization – Increased Coverage



Thank you

UMTS 900 Guidelines v4

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