Technology WiMAX Network & Service

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Part 1: WiMAX Network

WiMAX (Worldwide Interoperability for Microwave Access) is a telecommunications protocol that provides fixed

and mobile Internet access.

WiMax is a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative

to cable and DSL.

Standard:

•802.16d-2004 is also known as 802.16d, which refers to the working party that has developed that standard. It is sometimes referred to as “Fixed WiMAX,” since it has no support for mobility
•802.16e-2005, often abbreviated to 802.16e, is an amendment to 802.16-2004. It introduced support for mobility, among other things and is therefore also known as “Mobile WiMAX”.

Spectrum Allocation:

WiMAX Forum has published three licensed spectrum profiles: 2.3 GHz, 2.5 GHz and 3.5 GHz

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The WiMAX Forum WiMAX Architecture

  • SS/MS: the Subscriber  Station/Mobile Station
  • ASN: the Access Service Network
  • BS: Base station, part of the   ASN
  • ASN-GW: the ASN Gateway, part of the ASN
  • CSN: the Connectivity Service Network
  • HA: Home Agent, part of the

  CSN

  •  AAA: Authentication, Authorization and Accounting Server, part of the CSN
  • NAP: a Network Access Provider
  • NSP: a Network Service Provider

 

WiMAX Architecture

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Connection follows: mobile station -> base station -> ASN-GW -> AAA-> Internet.

Part 2: Service

Service

Wireless Broadband Service:

Wireless Broadband refers to technology that provides high-speed wireless Internet access

Email Service:

•Qubee email address and Qubee SMTP
•Customers own email address and own SMTP
•Customers email address and Qubee SMTP

Static IP service:

Qubee provide static IP service after getting proper justification as well as other criteria for using.

Use of static IP:

•Server (Email, DNS, Database Server..etc)
•VPN Server
•Remote access using SSH, Telnet or http.
•Remote Desktop
•IP Camera etc.

We provide public IP to all subscribers and its dynamic.

 

We provide static IP service for those customers, who applied for static IP with proper justification of use as well as after matching other criteria.

Bandwidth:

A rate of data transfer, bit rate or throughput, measured in bits per second (bps)The wider (or broader) the bandwidth of a channel, the greater the information-carrying capacity, given the same channel quality.

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Radio Criteria

Ensuring quality service:

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Part 3: During Installation/Support

During Installation/Support

1.Select the most appropriate position for the Modem.  It should be by a window that faces the nearest BTS Site.  To do this, the Sales Agent must know where the best serving cell is in order to determine which window provides the best possible signal.
2.Place Modem so that the LEDs and connectors are facing into the house.
3.Try to place the Modem as far away from metallic objects as possible.
4.If the customer wants to use a WiFi router*, ensure that the WiFi router is placed at the maximum possible distance from the modem and in a different horizontal plane.  The further the better, as the WiFi signal will interfere with the modem’s WiMAX signal, causing the modem slow down.  A distance of 3 meters should be considered to be the minimum.

 

*WiFi routers must be password protected, so as to prevent neighbours from “stealing” bandwidth.

Correct Positioning of The Modem

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Optimise the Signal Strength

It should be understood that the strongest signal is not always the best signal.  The WiMAX modem needs to receive  the best quality signal, as indicated by the C/I ratio.  This means that the Sales Agent needs to achieve the highest  possible C/I ratio, as opposed to the highest RSSI.

1.Obtain the strongest signal possible, as indicated by the RSSI lights or signal bar.
2.Check the C/I ratio.
3.Check other locations, within the premises, to ensure that the highest C/I ratio has been achieved.

Install the modem in the location with the highest C/I ratio

Optimise The Signal Strength Untitled Best position is not always in direction to Base Station. Sometimes reflected signals could be stronger. Check

this if signal is poor to the direction of BTS.

 

Part 4: Some Practical Scenario

 

Critical Zone

Fixed the modem with nearest and best performing BS only with stable   CINR.

 

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Stable CINR-Critical Zone

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Packet Error

 

Fixed the packet error rate with “0” by best  alignment  the  modem

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RSSI LED

 

Showing all four RSSI LED on modem doesn’t mean network status is good and showing less RSSI LED doesn’t mean network status is poor. Check the CINR and other  value. Basically found less RSSI LED at lower level floor(ground floor, 1st floor)

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Bandwidth Fluctuation

 

If get required radio status but frequent bandwidth fluctuation  from specific www, please check it from Qubee  FTP

(180.234.0.150). If the  same problem exist,  keep record  and inform.

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Part 5: Tips

§ In some cases modem gets multiple base stations and access location change frequently. For those cases users are in the middle of two or more Base Stations or two sectors. Result is CINR fluctuations, Frequent disconnections, Session time outs, Bandwidth fluctuations and Authentication failing  or taking too much time to authenticate.
§

Solution: Relocate the modem properly with best serving cell only

 

§ Some times agents face problem to install shuttle in old version PC (pentium 1, Pentium 2, Celeron).

 

Solution: Identify shuttle manually from PCs hardware manager.

 

 

§ Shuttles face detection problems in  OS (Windows Vista 64 bit, Windows 7 ) when some of their default programs run. Example: defender, windows firewall.

 

Solution: Turn off those programs manually.

 

§ Some times shuttle software get corrupted.

 

Example: When install the software, show “Run Time Error”

 

Solution: Provide the software manually and install it again.

 

§ For some antivirus or internet security program needs to be disable/enable some options for connecting shuttle.

 

Example: allow external traffic, disable security firewall.

 

§ Some times shuttle shows its Base Station field “P1” which doesn’t   exist.

 

Solution: Disconnect and reconnect the modem or reinstall the software.

 

For some case when signal strength goes down it also shows “P1”.

 

§User’s location is under coverage and CINR is satisfactory, but RSSI value is less than -80. The modem cannot connect.

 

Solution: If the RSSI value goes less than -80 usually the modem gets disconnected or cannot connect. The only

solution is relocation of the modem where the RSSI value goes higher than -80.

 

§Suppose the user is using through a wireless router, but cannot get proper signal or getting disconnection/fluctuation.

 

Solution: The modem and the router should not be kept close together. Keep a certain distance between the router

and the modem.

 

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