14- basic base station commissioning
DESCRIPTION
wimax btsTRANSCRIPT
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© Copyright Alvarion Ltd.
Radio Commissioning 4MotionTM
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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
Base station Configuration
Defining the radio link
Air protocol parameters change frame structure
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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
Basic Radio Configuration General
Name – used for easier identification by the USER
Optional
Descriptive parameter
String up to 32 characters
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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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
You have
You have
Paging Group
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Alvarion Training ServicesVer 2.5m (090911)
Idle Mode
� Paging Controller
• When in Idle mode
• Controls Idle MSs
• In this version = BS You have
You have
You have
Paging Group
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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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© Copyright Alvarion Ltd.
Reuse 3X1X3 configuration
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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
Connectivity Basic – bearer
� IP Address –
The IP address that represents the BS
Value – 4 octet number
No default
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Alvarion Training ServicesVer 2.5m (090911)
Connectivity Basic – bearer
� IP Subnet Mask –
The Subnet Mask that determines the BS Subnet
Value – 4 octet number
No default
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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
Connectivity Basic – bearer
� MTU Size –
The Maximum Transmit Unit size
For optimization
Can use default – 1500 Bytes
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Alvarion Training ServicesVer 2.5m (090911)
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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Alvarion Training ServicesVer 2.5m (090911)
Connectivity Basic – Authentication
� Default Authenticator IP Address
• The ASNGW IP Bearer address
• Please Note – not the AAA IP address
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Alvarion Training ServicesVer 2.5m (090911)
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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