Macrocells and FemtOcells Systems with Advanced Interference-aware coordination and Cooperation techniques
Funder:Spanish Government
Start date:2011 January 1st
End date:2013 December 31st
Keywords:Interference coordination, femtocells, distributed radio resource management
SPCOM Participants:Adrian Agustin de Dios, Margarita Cabrera Bean, Juan Fernández Rubio, Luis García Ordóñez, Olga Muñoz Medina, Alba Pagès Zamora, Adriano Pastore, Javier Rodríguez Fonollosa, Silvana Silva Pereira and Josep Vidal Manzano
SPCOM Responsible:Olga Muñoz Medina


The MOSAIC project aims at providing high system throughput and homogenous high-rate coverage for the next generation OFDMA-based cellular networks (802.16m and LTE-A). These goals are in line with the IMT-Advanced requirements described in [ITU-R M.1645] and match the targets of the IEEE 802.16 Task Group m (TGM) for Advanced Air Interface. To achieve the improved spectrum efficiency which is required to meet these goals, three new key aspects are currently envisioned in LTE-A and 802.16m:

·        The use of distributed MIMO schemes to provide the high link efficiency of conventional MIMO technologies, and also combat shadowing and pathloss, the major causes of coverage outage.

·        The coordination of the sector bandwidth and power allocation to achieve flexible frequency reuse ratios.

·        The use of relays and femtocells (cells served by low range and low cost base stations installed in the households that connect standard mobile devices to a mobile operator’s network through an IP-based backhaul link) to reduce the size of the cells, allowing transmission with smaller powers and consequently a more aggressive spectrum reuse.

The MOSAIC project relies on the latest developments in information and communication theory and on the group’s experience in cooperative transmission to exploit concepts like cooperative multiplexing, distributed multi-base station precoding, distributed synchronization, coordinated interference-aware radio resource management and interference alignment in future systems that, as 802.16m and LTE-A, include cooperation, interference coordination and femtocells as an integral part of the system.

The project will address the study of these systems in the following ways:

·         The design of cooperative schemes when several cells can exchange of information at the data plane, i.e. messages. Different strategies will be considered depending on the link connecting the cells.

·         The design of coordination mechanisms when the cells can exchange information at the control plane (for instance, channel status and level of interference) but not at the data plane.

·        The study of distributed consensus algorithms, useful in problems of synchronization of cooperative base stations.

·        The design of appropriate scheduling techniques in communications architectures with coordination and cooperation.

·        A theoretical study of the fundamental limits associated with wireless communications architectures including the study of the tradeoff between multiplexing gain, the diversity gain and the array gain. This study will allow for comparative study among different topologies and it is a natural continuation of TEC 2006-06481 project Fundamental limits of Network Information Theory developed by the same group.

·        The design of a femtocell based system that includes the coordination and cooperation concepts developed in the project

The techniques developed during the project will be compared in terms of performance, implementation complexity, benefits for the operators (in terms of capacity / cost) and feasibility for communication systems such as WiMAX or LTE-A. The tools developed will likewise compare femtocells based deployments with other deployments based on a more mature technology, such as relaying.

Latest Related Journal publications

[1] M. Torrellas, A. Agustin de Dios and J. Vidal, "Achievable DoF-delay Trade-offs for the K-user MIMO Interference channel with delayed CSIT", IEEE Transactions on Information Theory, October 2016. | Details | Full document | BibTex

[2] M. Torrellas, A. Agustin de Dios, J. Vidal and O. Muñoz Medina, "The DoF of the 3user MIMO Interference Channel", Transactions on Communications, Vol. 62, September 2014, pp. 3842 - 3853. | Details | Full document | BibTex

[3] A. Pastore, T. Koch and J. R. Fonollosa, "A Rate-Splitting Approach to Fading Channels with Imperfect Channel-State Information", IEEE Transactions on Information Theory, Vol. 60, July 2014, pp. 4266 - 4285. | Full document | BibTex

Latest Related Conference publications

[1] M. Torrellas, A. Agustin de Dios and J. Vidal, "Net DoF analysis for the K-user MISO IC with outdated and imperfect channel feedback", European Conference on Networks and Communications, June 2015, pp. 52 - 56. | Details | Full document | BibTex

[2] M. Torrellas, A. Agustin de Dios and J. Vidal, "Retrospective Interference Alignment for the MIMO Interference Broadcast Channel with Delayed CSIT", IEEE International Symposium on Information Theory, June 2015, pp. 1492 - 1496. | Details | Full document | BibTex

[3] A. Agustin de Dios, S. Lagén and J. Vidal, "Channel Training Procedures for MIMO Interfering Point-to-Multipoint Channel", IEEE Global Communications Conference, December 2014. | Details | Full document | BibTex

Latest Related Books

[1] A. Agustin de Dios, O. Muñoz Medina, J. Vidal and Savo Glisic, "Relay-Assisted Wireless Networks", Wiley - IEEE Press, September 2011, pp. 585 - 682. | Details | BibTex

Latest Related Patents

[1] J. R. Fonollosa, A. Agustin de Dios, O. Muñoz Medina and J. Vidal, "Methods and systems for decentralized managing of neighboring femtocells OEPM" December 2014. | Details | Full document

[2] J. R. Fonollosa, A. Agustin de Dios, O. Muñoz Medina and J. Vidal, "Methods and systems for decentralized managing of neighboring femtocells USPTO" August 2013. | Details | Full document

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