14- Basic Base Station Commissioning

© Copyright Alvarion Ltd.

Radio Commissioning 4MotionTM

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Objectives

Upon completion of this module students should know the following:

Understand the Basic Radio Parameters

Configure Basic Radio Parameters

Understand Basic connectivity Parameters

Configure Basic connectivity Parameters

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Base station Configuration

Defining the radio link

Air protocol parameters change frame structure

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Base station

� Creating a new BS

• Right click BS in navigation panel

• Set BS ID LSB

• These are the BS ID last 3 octet

• Set Operator ID

• These are the BS ID first 3 octet

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Basic Radio Configuration General

Name – used for easier identification by the USER

Optional

Descriptive parameter

String up to 32 characters

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Basic Radio Configuration General

BS Identification – used for identification of the BS over R1

Must be unique

Operator ID –

Read Only

Set at BS creation

BS ID –

Read Only

Set at BS creation

BSID – 100.100.100.10.10.1

BSIDs –100.100.100. 10.12.1/2/3

BSIDs – 100.100.100.10.11.1/2/3

BSID – 100.100.100.10.10.2

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Basic Radio Configuration General

Radio Parameters – setting the physical characteristics

Bandwidth –

5 MHz / 7 MHz / 10 MHz

Center Frequency - The center of the frequency band in which the BS will transmit

3500 MHZ 3550 MHZ

3515 MHZ

3520 MHZ center frequency

10MHz Bandwidth

3525 MHZ

Frequency

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Basic Radio Configuration General

Idle Mode Free operational resources

Battery save

MS unavailable

Enabling / Disabling Idle Mode

Paging Group ID - Unique value

Range 0 - 65535

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Idle Mode

� CPE does not transmit or receive user data

� CPE is completely deregistered

� Frees up valuable resources

� Power save

� Idle mode saves more power than sleep mode

� Eliminating handover traffic from inactive MSs

� Only Basic mode in this version

Active Idle

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Idle Mode

� Location Update

• The CPE continue to scan the network

• keep track of it's location

• Paging update to the network when it moves out of a predefined location

• When needs to receive data from the network it can be quickly located

I’m

Here

Now

I’m

Here

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Idle Mode

� Paging group

• When downlink traffic arrives

• MS is paged by a collection of base stations

• MS is assigned a paging group by the BS before going into idle mode

• MS periodically wakes up to update its paging group

You have

mail

You have

mail

You have

mail

Paging Group

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Idle Mode

� Paging Controller

• When in Idle mode

• Controls Idle MSs

• In this version = BS You have

mail

You have

mail

You have

mail

Paging Group

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Idle Mode – example

� Different “Paging Groups”

� Relatively small

� Reduce overhead

� MS sends “Location Update”

� When in Idle Mode –controlled by “Paging controller”

Location u

pdate

Location update

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Idle Mode – Advanced Configuration

� In the BS services

• “Paging cycle”

• The interval for paging the MS

• “paging offset”

• For calculating the start frame

• “Traffic Idle period”

• No pending Downlink data

• Considered as idle

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Idle Mode Illustration

4. Sending periodic

location updateTo group 333

1. No Data pending

for MS 300ms

2. Bs is part of Paging Group 333

3. Before you go Idle

You are part of 333

5. Datafor MS

6. Wake UP

7. Reconnect

8. Data

for MS

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Basic Radio Configuration Air Frame

Cell ID

Used for preamble selection

Value 0 - 31

Represents a BTS/cell site in the deployment

Cell ID =0Cell ID =1

Cell ID =2

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Basic Radio Configuration Air Frame

Preamble Group –

To allow using the 113 Preambles

Used for preamble selection

Value 1,2

Hex

Value

1197

Hex

Value

0096

..95

113

Hex

Value

011

Hex

Value

000

Series to modulate

SegmentIDCellIndex

1

2

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Basic Radio Configuration Air Frame

Segment Number –

Used for preamble selection

Value 0 - 2

Represents a Sector in the a cell site

Segment =2Segment =1

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Basic Radio Configuration Air Frame

Preamble index - Preamble used by the BS

Read only

Dependent on:

cell ID

Preamble group

Segment number

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Basic Radio Configuration Air Frame

Total Uplink Duration

Has to be constant in a deployment

Determines Uplink to Downlink ratio

Values – 4 - 7

DL Frame UL Frame

~ 55 %~ 45 %7

~ 60 %~ 40 %6

~ 70 %~ 30 %5

~ 75 %~ 25 %4

DownlinkUplinkTotal UL Duration

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Basic Radio Configuration Structure Zones

� The explanation of each parameter is out of the scope of this course

� For maximum Bandwidth configure the following:

• Mark all available “Map Major group” boxes

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Reuse 3X1X3 configuration

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Reuse 3X1X3 Concept

� Reuse - Total available bandwidth which is re-used within the radio network

� Name scheme R x N x S

• R = independent frequency resources available for allocation

• N = numbers of wideband carriers (5, 7 or 10MHz)

• S = Number of sectors in site

� 3X1X3 scheme – digitally divides one carrier (frequency slice)

� CPE has to Support

3x1x3

Deployment

Same

Frequency1/3 of

Capacity

1/3 of

Capacity

1/3 of

Capacity

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Reuse 3X1X3 Configuration

� BS “General”

• All three sector (BS)

• DIFFERENT “Name”

• DIFFERENT “BS ID LSB”

• All three sector (BS)

• SAME “Center Frequency”

• SAME “Bandwidth”

Same Frequency

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Reuse 3X1X3 Configuration

� BS “Air Frame Structure General”

• All three sector (BS)

• SAME “Cell ID”

• SAME “Preamble Group”

• All three sector (BS)

• DIFFERENT “Segment Number”

Same

Frequency1/3 of

Capacity

1/3 of

Capacity

1/3 of

Capacity Segment XSegment Y

Segment Z

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Reuse 3X1X3 Configuration

� BS “Air Frame Structure Zones”

• For equal Bandwidth sectors

• DIFFERENT “Map Major Group” settings”

• BS 1 – 0,1

• BS 2 – 2,3

• BS 3 – 4,5

0,1

2,34,5

BS 1

BS 2

BS 3

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Basic Radio Configuration Mobility

� The system assumes mobility

� Mandatory to configure one trigger

� Set one trigger

• Own RSSI < -60 Scan request

� Mobility is explained in the “Mobility” module

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Diversity

� Use of more then 1 antenna

� For overcoming

• Signal fading

• Multipath

• Interferences

� Increases coverage

� Same signal with time shift

No Diversity

Delayed Diversity

=∑Fade Offset

gained by diversity

Fade area

Not receivable

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STC - Space Time Coding

� Improve coverage in NLOS scenarios

• About 2.5 dB

� Not impacting the Capacity

0 1 0 1 0 0 0 1 0 1

0 1 0 1 0 0 0 1 0 1

Symbol x

Symbol y

Decoding

STC

Encoding

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MIMO - Multiple in Multiple Out

� DOUBLES the Capacity

� Not Improving coverage

� Different Data streams over the air

0 1 0 1 0 0 0 1 0 1

0 1 0 1 0 0 0 1 0 1

MIMO Matrix B

Decoding

MIMO Matrix B

Encoding

0 0 0 0 0

1 1 0 1 1

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MIMO limitations

� Minimum 2 transmitting antennas for the Sector

� Minimum 2 MS receiving antennas

� Ms has to support MIMO

� Good radio link minimum RSSI and CINR

� Capacity is increased per sector not per MS

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MIMO and Diversity configuration

� By Default

• Automatic diversity configuration

� Based on the inserted parameters

• Antenna type

• Number of antennas

• Sector association

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Connectivity Basic – bearer

� IP Address –

The IP address that represents the BS

Value – 4 octet number

No default

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Connectivity Basic – bearer

� IP Subnet Mask –

The Subnet Mask that determines the BS Subnet

Value – 4 octet number

No default

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Connectivity Basic – bearer

� Default gateway –

The IP address of the next Router

In a distributed solution can be the Bearer IP address

Distributed Centralized

Default Gateway

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Connectivity Basic – bearer

� MTU Size –

The Maximum Transmit Unit size

For optimization

Can use default – 1500 Bytes

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Connectivity Basic – Bearer

� Vlan ID –

The Bearer Vlan ID

Read only

Mismatch between the BSsand the ASNGW will end in network entry failure

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Connectivity Basic – Authentication

� Default Authenticator IP Address

• The ASNGW IP Bearer address

• Please Note – not the AAA IP address

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Connectivity Basic – Authentication

� Authentication Thresholds

• Alarm is sent if reached

• Suspended EAP Process

• Authentication Process that failed

• Active MSs

• currently connected MSs

• Maximum EAP Rounds –

• EAP retries

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Thank You