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Dynamic Spectrum Management
Video / Jan 2013 / DSM

InterDigital Dynamic Spectrum Management. How it works.

Channeling all our power into the inventiveness behind DSM - Dynamic Spectrum Management. What is DSM? It is the process of combining shared spectrum frequencies with Wi-Fi or LTE to achieve a better end-user experience.

How does DSM work? Because TVWS frequency usage is a location-specific augmentation.

We use our technology to determine which TVWS channels are available to be utilized in the device's area.

Then InterDigital technology senses which of these channels has the least amount of interference.

Our Interference Management System then chooses four channels to aggregate with Wi-Fi having the least amount of interference.

Very intelligent management system. Our management system offers non-contiguous aggregation, the most flexible augmentation to a user's device.

If a channel deteriorates, our technology will change that channel to the next best candidate channel.

This is all made possible through our unique, state-of-the-art wideband radio which digitizes the complete frequency spectrum and aggregates on the fly. Here's how it works! LTE solution platform architecture.

Transceivers Interface Board LTE Protocol Channel
(LIME Radio) FPGA+DSP Stack Management DSM Policy
LTE BAND I or II Function (CMF) Engine
| Database
Transceivers |__ Standard &
(LIME Radio) Sensing RF Controller Private Policies
TVWS Toolbox

And for the techies – Wi-Fi Solution Platform Architecture.
DSM Platform – AP:
Enhanced 802.11n MAC/PHY Development Board (ARM)
Sensing toolbox running on a TI OMAP 35.30
Wideband digital radio development board

Programmable Interferer

DSM Platform – Client
DBB (Sensing Toolbox/STB)
TVWS Radio

DSM Client
DSMGU, media server, programmable interferer SW

Channel Management Function


How is DSM used?
Using shared spectrum with Wi-Fi and cellular results in better range, new connectivity options and carrier-grade QOS.

1) Shared spectrum for Wi-Fi augmentation

Router signal reach

Shared spectrum signal reach

2) Shared spectrum for LTE offload and LTE small cells

3) Or shared spectrum for backhaul & M2M solutions
TVWS propagation characteristics make TVWS-based backhaul deployment cost effective and enables broadband/cable delivery to areas with inadequate coverage

InterDigital is moving to advanced 3-tier spectrum sharing using real-time, cognitive spectrum brokering and database control to ensure efficient spectrum usage.

2-Tier spectrum sharing model: incumbent primary user > opportunistic secondary user
Licensing Arrangement with
3-Tier spectrum sharing model: incumbent primary user > licensed secondary user > opportunistic tertiary user

What are the benefits of DSM?
Industry forecasts of mobile data traffic. Industry forecasts for broadband and mobile data traffic is predicted to increase dramatically. Users who utilize our DSM will see these advantages

1) Capacity Enhancements (Wi-Fi offload shared spectrum)
2) Improved Coverage (strong throughput everywhere)
3) Interference Mitigation
4) Quality of Service (Reliable video, reliable gaming, reliable internet, reliable everything)

Our thinking is always at the heart of a better user experience!