dynamic spectrum management for multi-radio environments€¦ · lehrstuhl für funkkommunikation...

Lehrstuhl für

Funkkommunikation und Navigation

Chair for

Wireless Communication and Navigation

21.05.2013

1

Dynamic Spectrum Management

for Multi-Radio Environments

Fabian Quint, Andreas Klein, Hans Schotten

Fachtagung Mobilkommunikation Osnabrück, May 15, 2013

Lehrstuhl für


Chair for


21.05.2013

2

Contents

• Motivation

• Dynamic Spectrum Management Concepts

• DSA Algorithm

• Simulator Model

• Analysis of the Results

• Conclusion

Lehrstuhl für


Chair for


21.05.2013

3

Motivation

• Current wireless technologies are facing limited resources in the frequency domain.

• Today, spectrum is allocated statically due to regulatory constraints.

• Dynamic Spectrum Management (DSM) can increase system performance by managing spectrum in a flexible way.

Lehrstuhl für


Chair for


21.05.2013

4

DSM Concepts

• Different approaches how to achieve Dynamic Spectrum Access (DSM):


Dynamic Exclusive Use Model Open Sharing Model Hierarchical Access Model

Spectrum Property Rights Dynamic Spectrum Allocation Spectrum Underlay Spectrum Overlay

Lehrstuhl für


Chair for


21.05.2013

5

DSM Concepts

• Allow selling and trading of spectrum.

• Freely choose technology.



Spectrum Property Rights Dynamic Spectrum Allocation Spectrum Underlay Spectrum Overlay

Lehrstuhl für


Chair for


21.05.2013

6

DSM Concepts

• Dynamic spectrum assignment to different services.

• Exploit spatial and temporal traffic variations.



Dynamic Spectrum Allocation Spectrum Underlay Spectrum Overlay Spectrum Property Rights

Lehrstuhl für


Chair for


21.05.2013

7

DSM Concepts

• Open sharing among peer users.




Lehrstuhl für


Chair for


21.05.2013

8

DSM Concepts

• Hierarchical Access with primary and secondary users.




Lehrstuhl für


Chair for


21.05.2013

9

DSM Concepts

• Constrained transmission power.

• Operate below primary users noise floor (UWB).


Dynamic Exclusive Use Model Open Sharing Model


Hierarchical Access Model

Lehrstuhl für


Chair for


21.05.2013

10

DSM Concepts

• Constraint on where and when to transmit.

• Exploit spatial and temporal white spaces.


Dynamic Exclusive Use Model Open Sharing Model

Dynamic Spectrum Allocation Spectrum Overlay Spectrum Property Rights

Hierarchical Access Model

Spectrum Underlay

Lehrstuhl für


Chair for


21.05.2013

11

Dynamic Spectrum Allocation

• Contiguous DSA: Contiguous blocks of spectrum are allocated to different RANs.

• Fragmented DSA: Any arbitrary piece of spectrum can be allocated.

Lehrstuhl für


Chair for


21.05.2013

12

DSA Algorithm

Lehrstuhl für


Chair for


21.05.2013

13

Simulator Model

Lehrstuhl für


Chair for


21.05.2013

14

Simulator Model

• Spectrum Allocation based on predefined bandwidth chunks with size of 1.4 and 5 MHz.

• Calculation of interference events based on SEAMCAT methodology.

Lehrstuhl für


Chair for


21.05.2013

15

Simulator Model

• Quality of bandwidth chunks can be assessed by the introduced Spectrum Quality Indicator (SQI):

• Global and position dependent SQI values are considered to avoid interference.

Lehrstuhl für


Chair for


21.05.2013

16

Simulator Model

• Parameters Desired RAN LTE Interfering RAN WLAN

Lehrstuhl für


Chair for


21.05.2013

17

Simulator Model

• Exemplary temporal graph of DSA algorithm:

Lehrstuhl für


Chair for


21.05.2013

18

Analysis of the Results

• Assess benefit from operator point of view with success rate of bandwidth (BW) allocations:

• And by measuring the user satisfaction:

Lehrstuhl für


Chair for


21.05.2013

19


• Success rate of chunk allocation for traffic model (HTTP/FTP) scenarios:

• Significant gains through interference avoidance approaches (based on SQI values).

Lehrstuhl für


Chair for


21.05.2013

20


• User satisfaction for full buffer and 25% base load scenarios:

• Significant gain with shared band usage.

• Impact of SQI consideration is neglectable.

Reference case with disabled shared band

Lehrstuhl für


Chair for


21.05.2013

21

Conclusion

• A basic temporal DSA algorithm was developed and introduced.

• The interference avoidance techniques based on SQI values showed respectable gain for traffic model scenarios.

• The usage of a shared band results in a significant gain for user experience.

dynamic spectrum management for multi-radio environments€¦ · lehrstuhl für funkkommunikation...

Documents