Digital Signal Processing Reference
In-Depth Information
available context information. This evolution towards policy derivation by the NRM
that will guide the TRM do execute it's cognitive control mechanisms in a way that
are in line with the overall network objectives is an important enabler for CR. In ad-
dition to the decision framework, the entities for information extraction, collection
and storage have been standardized. Also for this functionality, it is assumed that
TRM and NRM cooperate.
From April 2009, 1900.4 Working Group works on two projects:
•
1900.4a: Standard for Architectural Building Blocks Enabling Network-Device
Distributed Decision Making for Optimized Radio Resource Usage in Hetero-
geneous Wireless Access Networks - Amendment: Architecture and Interfaces
for Dynamic Spectrum Access Networks in White Space Frequency Bands. This
working group hence focuses on the extension of the 1900.4 standard for the TV
White Spaces specifically.
•
1900.4.1: Standard for Interfaces and Protocols Enabling Distributed Decision
Making for Optimized Radio Resource Usage in Heterogeneous Wireless Net-
works. This standard targets the next step with respect to the cognitive control
standardization.
2.4.2.2 1900.6
The intended standard defines the information exchange between spectrum sensors
and their clients in radio communication systems. The logical interface and sup-
porting data structures used for information exchange are defined abstractly without
constraining the sensing technology, client design, or data link between sensor and
client. The standard defines a Cognitive Engine (CE), a Data Archive (DA) and
a Sensor, and defines all logical interfaces between those entities. This definition
is hence in line with various approaches for obtaining information about spectrum
use, such as local sensing, distributed sensing or geo-location database. The stan-
dardized interfaces are very general to facilitate any sensing hardware, algorithm of
architecture. A follow-up project for the 1900.6 working group is under discussion,
to see how the standard can be instantiated for more practical sensing approaches or
geo-location database.
2.4.3 Reconfigurable Radio Systems: ETSI RSS
Similar to the IEEE DYSPAN initiative, the ETSI standardization is starting to stan-
dardize Reconfigurable Radio Systems. RRS is a generic concept to exploit the ca-
pabilities of reconfigurable radio and networks for self-adaptation to a dynamically-
changing environment with the aim of improving supply chain, equipment and spec-
trum utilization. The Technical Committee has four working groups on System As-
pects, Radio Equipment Architecture, Functional Architecture and Cognitive Pilot
