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The Mobile WiMAX Solution

The Mobile WiMAX SolutionTelsima’s Mobile WiMAX solution covers an enhanced set of technologies to bring the best-in-class solution to mobile network operators.

Telsima Mobile WiMAX solutions

  • Mobility enablers OFDMA PHY and MAC according to IEEE 802.16e-2005
  • MIMO Matrix A/B 2x2 and AAS (beam forming) antenna technologies
  • ASN according to WiMAX Forum NWG
  • Telsima TRUFLE ASN supporting mobile and fixed users
  • Telsima T-STORM technologies for advanced spectral resource management
  • Telsima advanced mobile user management and sector load management

Mobility Enabler IEEE 802.16e-2005

The RF enhancements in Mobile WiMAX as defined by IEEE 802.16e-2005 specifications include:
  • SOFDMA - based on its 512-1024 carriers, it is immune enough to compensate doppler effects up to 120 km/h
  • PUSC/FUSC - defines subchannelization in UL and DL, which allows for more link budget and a more robust modulation
  • BSHO/MSHO - defines the hand-off mechanisms for mobile stations to connect to always the best BS
  • Power Management - enabling the use of WiMAX in low power portable devices, such as phones and PDAs

MIMO & AAS Technology

Advanced Antenna technologies are key to improving WiMAX link budgets and enable a profitable WiMAX business model with greater user coverage and satisfaction. This takes into special consideration the characteristics of PDA type devices which are low power and restricted in antenna gain.

  • MIMO A/B & STC: The impact of MIMO A/B lies in its ability to switch between MIMO A and MIMO B. MIMO B operates in "spatial multiplexing factor 2" which effectively doubles the bandwith of the transmission link - but only if there is low correlation in the 2 antenna signals and if CINR is high. Once those conditions are not met Mobile WiMAX systems switch to MIMO A "spatial diversity", which provides single bandwidth, but adds much robustness to the link and increases the range of the cell. MIMO A is especially valuable for coverage in NLOS conditions. MIMO A with single receive antenna is also known as STC (Space Time Coding) mode.
  • AAS: Adaptive Antenna Systems (AAS) make use of multiple antennas to dynamically form a directional beam. This beam is controlled by the BS to point at the SS which it communicates with. AAS can provide major gains in LOS environment and is well suited in interference limited scenarios.
  • MIMO B + AAS: The best of both worlds scenario, it however requires significant investments, since a minimum configuration of MIMO 2x2 + AAS (2 segments) itself requires 4 antennas and transmitters.

In summary, Telsima's systems by default support MIMO A/B & STC and will add AAS wherever technically and commercially beneficial.

The Mobile WiMAX Solution

 

Mobile WiMAX Access Service Network (ASN)

With the industry adhering to the ASN NWG specifications of Mobile WiMAX, interoperability will be ensured between Mobile Stations, Base Stations, ASN infrastructure and CSN infrastructure.

Scope of the ASN infrastructure interoperability is to allow operators to source any device or Network Element from different vendors. Such an eco system and competition will allow multiple vendors to compete for certain functionalities. It is believed that the overall Mobile WiMAX solution generated by the eco-system will continuously improve while competitive pressure on Network Equipment Providers will lower the operators' investments.

Telsima is an active Principal Member of the WiMAX Forum since 2004 and has consistently been contributing to the Networking Working Group’s definitions of Access Service Network. Having shaped the ASN specifications and profiles, Telsima is fully committed to its implementation and to offer only compliant Base Stations, Mobile Stations and ASNGW products.
Telsima already today addresses both sides of the eco-system equation by offering disruptive cost points and by offering feature/performance enhanced WiMAX solutions through its intellectual property loaded TRUFLE ASN and T-STORM technologies.


Telsima Innovations

  • TRUFLE ASN - Telsima offers an alternative ASN architecture in which only commodity routers are required. Hence this solution embraces very low CAPEX and OPEX. All base station
    infrastructure deployed is forward compatible to ASN-GWs protecting operators investments when upgrading.
  • T-STORM - Telsima’s Spectral Resource Management technology allows operators to optimize the use of spectrum. It enables operators to plan for frequency reuse "factor 1" networks, to operate OFDMA in different settings (frame lengths, bandwidths) in parallel on the same frequency, and in addition, support OFDM (D+E Dual Mode) in parallel to OFDMA. Telsima ensures that the customer’s most scarce resource is best utilized.
  • Telsima advanced mobile user management and sector load management - The Telsima sector analysis tools enable operators to best control the user-utilization of each sector and to best manage the data throughput per sector by ensuring that the SLAs are met while mobile users impose additional sector load. Telsima ensures best user satisfaction.

The Mobile WiMAX Solution

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