This paper proposes a novel frame structure for the radio access interface of the next generation of mobile networks. The proposed frame structure has been designed to support multiuser spatial multiplexing, short latencies on the radio access interface, as well as mobility and small packet transmissions. The focus is on ultra dense small cell networks deployed in outdoor environments. This paper also highlights the various prospects and constraints of the proposed dense outdoor system in comparison with alternative system designs. Numerical results are included and a comparison to the Long Term Evolution (LTE) system is provided. Results show that the proposed radio frame structure leads to an improvement of the area spectral efficiency by a factor of ≈ 24 as well as a reduction of the average air interface latency by a factor of 5, thus remaining shorter than 1 millisecond.978-1-4799-8088-8/15/$31.00 ©2015 IEEE

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This paper evaluates positioning accuracy of radio fingerprinting algorithm in commercially deployed LTE (Long Term Evolution) network operating on 800 MHz, 1800 MHz and 2600 MHz frequency bands. Training database required for fingerprint positioning is constructed from field measurements that resemble LTE Release 10 Minimization of Drive Test (MDT) trace records. Performance is compared between LTE and LTE+WLAN grid-based RF fingerprint measurements utilizing partial fingerprint matching. Results indicate that partial fingerprints that consist of LTE and WLAN radio measurements decrease positioning errors at least by a factor of 3.5x while the percentage of discarded samples is kept low. This emphasizes the importance of having generic MDT functionality for automating the collection and correlation of radio measurements in heterogeneous LTE and WLAN networks.

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