S3ISE · Spectrum Sharing Systems for Improving Spectral Efficiency
FP7 — People (Marie Curie Actions)
- Duration
- 2012-09-01 → 2016-08-31
- EU contribution
- €100,000
- Participants
- 2
- Scheme
- MC-CIG
Lines connect the coordinator with its partners.
Results in brief
Spectrum Sharing Systems for Improving Spectral Efficiency
Cognitive radio is an intelligent wireless system that is aware of its surrounding and adapts its operating parameters with the objective of efficient utilization of the radio spectrum. Spectrum sharing systems are usually considered as an instance of cognitive radio systems in which under certain conditions, a Secondary Service is able to access a frequency band formally allocated to the Primary Service by adopting cognitive scenarios. Spectrum sharing is capable of addressing the radio spectrum scarcity issue. In spectrum sharing, the under-utilized spectrum as the available radio resource which can be utilized by the secondary service varies over time. The main challenge in addition to detecting the underutilised parts of the spectrum is devising efficient radio resource allocation techniques which do not require signalling between the two systems due to practical reasons. We started with addressing the inter-system signalling and developed an analytical framework for a general multi-carrier system where we very limited information about the channel variations. We then developed techniques which achieve similar performance comparing to the state-of-the-art but with a much lower signalling overhead and computational complexity. We then devised a technique for indirect signalling between the primary and secondary systems and showed that the proposed method does not make the primary system unstable and at the same time provide higher capacity per unit of radio spectrum. This means less expensive radio spectrum costs for the operators, thus lower communications costs for the mobile users. We then extended our work by integrating of sensing into radio resource allocation and proposed a method to find optimal sensing parameters in the secondary systems. This provides a theoretical foundation for benchmarking spectrum sensing techniques. We further proposed new high performance spectrum sensing mechanisms based on deployment of spectrum sensors in the network. Build upon the above research we then designed a mixed underlay overlay access system with minimum signalling based on a distributed algorithm for evaluating activity index in a coexisted multi-system setting. We showed that the proposed method significantly improves the spectrum sharing system throughput efficiency and tackles the need for inter-system signalling. We further proposed techniques and measure which provides a quantitative base for negotiation of various parties using the same part of the radio spectrum. The proposed method is capable of increasing competition in acquiring and sharing radio spectrum which ultimately reduces the mobile communication costs.
Data: CORDIS, © European Union
Project objective
In this project an analytical cross layer framework is developed for optimal radio resource modelling and allocation for multi secondary user spectrum sharing systems. The proposed analytical framework is able to model the impact of the system and service parameters in their corresponding time scales and level of accuracies on the system performance. In particular, one of the objectives of this project an objective is to integrate spectrum sensing into other upper layer functionalities such as power and rate control, and resource scheduling. This improves the spectrum sharing system performance through exploiting inherent dynamics in a spectrum sharing environment in their corresponding time scales. Fundamental system scalability aspects are also investigated in this project through considering multi-user secondary network. Based on the developed analytical framework, the next step is to develop efficient schemes and implement such optimal radio resource allocations considering practical concerns. Practical concerns include minimizing the level of inter and intra system signalling, signalling overhead and robustness to imperfect inputs. The key objectives of the proposed project which are distinguished comparing to the state-of-the-art and contribute into the field of interest are: i) obtaining fundamental performance limits and scalability characteristics for multiuser secondary system, ii) integrating sensing into the radio resource allocation which enables adaptive sensing, iii) developing low overhead resource allocation algorithms with robustness against uncertain inputs e.g., cross channel CSI, and iv) proposing efficient network architectures based on the vision the proposed framework provides on the trade-offs among different system parameters and practical considerations. Experimental demonstration of such networks will also be pursued via finding other sources of funding or in collaboration with other research groups.
Original text from CORDIS.
Participants
- UNIVERSITY OF LANCASTER · LANCASTERCoordinatorUnited Kingdom
- UNIVERSITY OF LEEDS · LeedsUnited Kingdom
Links
Data: CORDIS, © European Union