This paper presents a demonstration of the new Licensed Shared Access (LSA) concept using a TD-LTE access network in the 2.3 GHz spectrum band in Finland. In the demonstrated trial, the TD-LTE network shares the spectrum of an incumbent spectrum user, who is focused on programme making and special events (PMSE) services. The demonstrator implements the new LSA concept and the required new building blocks including LSA Repository for spectrum protection information and LSA Controller for controlling the mobile communication network in the same band. The trial uses commercial network components like multiband-terminals, TD-L TE base stations, network management system, and core network. Spectrum usage data of incumbents is collected to LSA Repository using two incumbent user tools and is actively updated to LSA Controller for radio network planning to protect the incumbent's activity in the area. LSA Controller uses the information from the base stations and incumbents to protect incumbent spectrum users' rights. This is demonstrated by providing different algorithms, which analyze base stations and sectors that need to be reconfigured to prevent interference from LTE to incumbent (and vice versa). The demonstration shows that the new LSA concept can be implemented with existing network elements and a minimum amount of new components.

Presentation of paper (Licensed Shared Access (LSA) Trial Demonstration Using Real LTE Network)

Supporting Public Protection and Disaster Relief (PPDR) services are mandatory in modern wireless access networks. The sub-1GHz band is particularly suited to provide PPDR services due to the better propagation characteristics and attendant increase in link budget. In this work, we describe a novel transmit mode under a multi-operator non-orthogonal spectrum sharing framework, which can provide robust PPDR waveforms. This Ultra-Reliable Broadcast (URB) solution is based on the Licensed Shared Simultaneous Access (LSSA) broadband wireless access system which has been designed earlier by our group to provide much higher sum-rates in each cell when compared to a single-operator network, by enabling synchronization and different levels of co-operation across multiple TDD operators simultaneously using the same air-interface technology in the same spectrum. Using 19-cell system simulation with appropriate fractional frequency reuse scenarios, we compare the post-processing SINR CDFs of the 4 operator LSSA network and a single operator network, when both of these broadcast a single network-wide PPDR message. Their performances are also compared under disaster conditions where with a probability p, any of the eNodeBs can suddenly fail. We develop and use a simple 3-D stochastic path-loss model to account for users in multi-storey buildings, where depending on the user location the mean value of the shadow loss is varied. Our simulation results in the UHF band (500MHz carrier frequency) indicate that at the 10th percentile of the CDF, under normal operating conditions, the proposed URB solution with four LSSA operators can provide more than 10dB gain in SINR, and for p=0.5, this gain increases to 14dB, when compared to the single operator system.

M Krishna

Papers

Ultra-Reliable PPDR Broadcast using Licensed Simultaneously Shared Access networks