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Frequency Decimation Method to Support Dynamic Control Channels for Wireless Networks

Dynamic control of wireless networks to maximise quality of service


Overviewfrequency decimation technique diagram

A dynamic common control channel (CCC) for wireless networks that is easily assigned and rapidly identified and accessible by its users, without requiring the allocation of a dedicated band. This channel may have several functions, such as facilitating network discovery, coordinating spectrum access, and providing awareness to nodes about their radio environment..

What Problem Does it Solve/Advantages

The proposed two-tiered CCC architecture has the potential to solve the following issues:

  • Saturation – Being allocated in the same band as users’ data channels, the proposed CCC’s total bandwidth increases proportionally with the number of nodes in the network and their respective data channels’ bandwidth. Saturation of the control channel is, therefore, unlikely to occur. However, only the second tier of the CCC should be employed for control data exchange with high throughput demands.
  • Regulatory issues – The CCC is allocated in-band, avoiding all the regulatory issues regarding the harmonization of global out-of-band CCC;
  • Incumbent activity/Interference – The interference on the CCC only affects one node and not the whole network. This decreases the network recovery time and the overhead associated with it.
  • Channel range – Contrarily to underlay architectures proposed in the literature, there is no gap between the range of nodes’ transmissions in their respective CCCs and data channels;
  • Fast network discovery and rendezvous – The first-tier of the CCC, with the support of the frequency decimation algorithm, allows rapid network discovery and rendezvous between nodes. Each node, in order to identify its neighbours, selects the first-tier subcarriers of several channels simultaneously through an analog frequency decimator and decodes them.
  • Broadcasting – The proposed scheme, contrarily to most in-band architectures described in the literature, allows a node to broadcast information to several neighbours simultaneously. In order to do so, the user starts by transmitting a “broadcast command” in the first-tier subcarriers of its channel. Other nodes that are employing frequency decimation receive this request through some of the selected first-tier subcarriers. After decoding the content of the received message, they tune in to the user’s data channel and enter receive mode.

Possible Applications

  • Any wireless network capable of multi-channel operation, including cellular / mobile networks, WLANs, OSA networks, M2M, small cells, ad-hoc networks, private mobile radios (PMR).
  • Any company or consumer that is interested in deploying wireless networks without a dedicated control channel, such as military and emergency services, user deployed small cells, cognitive radio systems, etc.
  • The invention can cover a very wide range of consumers, in particular, military, emergency services and civilians.

Technology and Patent Status


The opportunity

This technology is available for license/collaboration.

Researcher: Dr Francisco de Castro Paisana, Prof Nicola Marchetti, Prof Luiz DaSilva

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