Outcomes of project BMWI C-PMSE and ETSI STF386 standardisation work on cognitive radio technology for PMSE
Fischer G (2015)
Publication Language: English
Publication Type: Conference contribution, Conference Contribution
Publication year: 2015
Publisher: EUMA
Conference Proceedings Title: EUMW European Microwave Week
Event location: Paris
Abstract
There have been two initiatives one in ETSI called STF386 and one inside a German national research project named C-PMSE funded by BMWI (German Ministry of Research and Education), that both deal with cognitive radio resource management for PMSE. The ambition was to mitigate interference through cognitive techniques. Principles of cognitive radio technology were adapted to the specific requirements of PMSE. The talk will therefore start highlighting the specific characteristics of PMSE, which strongly deviate from other known systems. PMSE demands very high availability near 100\% in order to avoid drop-outs. Furthermore PMSE systems often are demanded to support very low latency in the order of 2 ms per PMSE link and 5 ms round trip. As PMSE usually can’t use heavy compression techniques (Digital Source coding or analogue compression) and channels are typically narrowband (e.g. 200 kHz), the operational SNR at RF is very high in the order of 50 dB. This makes PMSE very vulnerable to interference whether originating from other systems or own transmitter intermodulation. Cognitive resource management will dynamically adjust the transmit frequencies and transmit power of PMSE equipment. If the link quality degrades or is somehow about to degrade then above radio resource parameters are readjusted. The cognitive radio resource management is following the general rationale defined by the cognitive cycle as e.g. depicted by Mitola. For this purpose knowledge about the actual situation is needed. This knowledge is obtained by supervising actual link quality regardless whether analogue or digital transmission is used and by obtaining a radio environment map and consulting a geolocation database. In order to build this radio environment map, a grid of spectrum sensors is installed at an event location. Movement profiles of PMSE devices can thus be detected. It is important to stress that the cognitive regime followed includes nonlinear consideration. Spectrum resources interdepend due to non-linear effects, meaning that PMSE links could be interfered by transmit intermodulation from two other PMSE links, which makes the management of large scale events with many PMSE links challenging. Due to high operational SNR of PMSE links intermodulation products up to 5th sometimes even 7th order must be considered in transmit frequency assignment. The techniques derived during the course of the ETSI STF386 and BMWI C-PMSE project were implemented and practically studied in a trial at Messe Berlin. Luckily partners in the two initiatives were nearly identical and work in both initiatives was conducted in synchronous manner. The talk will therefore also highlight the practical implementations and trials conducted, that proofed the desired functionality. Although the technologies developed proofed that interference could be mitigated and thus PMSE links get more reliable in spectrum hostile environments, it was discovered that no additional capacity can be obtained.
Authors with CRIS profile
How to cite
APA:
Fischer, G. (2015). Outcomes of project BMWI C-PMSE and ETSI STF386 standardisation work on cognitive radio technology for PMSE. In EUMW European Microwave Week. Paris, FR: EUMA.
MLA:
Fischer, Georg. "Outcomes of project BMWI C-PMSE and ETSI STF386 standardisation work on cognitive radio technology for PMSE." Proceedings of the European Microwave Week -, Paris EUMA, 2015.
BibTeX: Download