Stefano Sorrentino

Bio: Stefano Sorrentino is an academic researcher from Ericsson. The author has contributed to research in topics: Wireless & Transmission (telecommunications). The author has an hindex of 23, co-authored 197 publications receiving 2082 citations. Previous affiliations of Stefano Sorrentino include Royal Institute of Technology.

Device-to-Device Communications for National Security and Public Safety

Abstract: Device-to-device (D2D) communications have been proposed as an underlay to long-term evolution (LTE) networks as a means of harvesting the proximity, reuse, and hop gains. However, D2D communications can also serve as a technology component for providing public protection and disaster relief (PPDR) and national security and public safety (NSPS) services. In the United States, for example, spectrum has been reserved in the 700-MHz band for an LTE-based public safety network. The key requirement for the evolving broadband PPDR and NSPS services capable systems is to provide access to cellular services when the infrastructure is available and to efficiently support local services even if a subset or all of the network nodes become dysfunctional due to public disaster or emergency situations. This paper reviews some of the key requirements, technology challenges, and solution approaches that must be in place in order to enable LTE networks and, in particular, D2D communications, to meet PPDR and NSPS-related requirements. In particular, we propose a clustering-procedure-based approach to the design of a system that integrates cellular and ad hoc operation modes depending on the availability of infrastructure nodes. System simulations demonstrate the viability of the proposed design. The proposed scheme is currently considered as a technology component of the evolving 5G concept developed by the European 5G research project METIS.

A method and an apparatus in a user equipment for controlling transmission power of the user equipment

Abstract: Disclosed are methods and apparatuses in user equipments (1400) and network nodes (1410, 420) for controlling transmission power of the user equipments when the user equipments are connected to a wireless network. The disclosed methods and apparatuses deals with independently controlling transmission power of SRS signals and signals comprising traffic data from the user equipment (1400). Thereby, it is possible to use different power levels for SRS signals intended to e.g. a macro node and for traffic data intended to e.g. a pico node.

Device to device (d2d) control information relay

Abstract: A method for a network node, a method for a relay wireless device, a method for an out of coverage wireless device, a network node, and a relay wireless device, an out of coverage wireless device are presented. The network node serves a cell in which a relay wireless device is at least partially located, and where further the network node provides at least partial network coverage for the relay wireless device located in the cell, and where furthermore an out of coverage wireless device is at least partially out of network coverage from the network node. The method includes determining that the network node should control the out of coverage wireless device. The method further includes determining D2D control information to be used for controlling the out of coverage wireless device (305), and finally the method includes transmitting the D2D control information to the out of coverage wireless device via a relay wireless device.

A user equipment and a method therein for transmission power control of uplink transmissions

Abstract: A UE and a method therein for transmission power control of uplink transmissions are provided. The method comprises receiving (810), through signalling a configuration indicating at least one reference signal, RS, and a reference transmission power level for each indicated RS. The method further comprises measuring (820)received power of the indicated at least one RS, and for each measured received power, determining (830)a pathloss, PL, based on the measured received power and the reference transmission power level for each measured received power. The method further comprises determining (840)an uplink transmission power based on at least one determined PL.

Comparison of LTE and DSRC-Based Connectivity for Intelligent Transportation Systems

Abstract: Intelligent transport systems (ITS) have recently attracted much attention, partly arising from the demands of improving road traffic safety and efficiency. 3GPP is addressing the communication needs associated to ITS and vehicle to vehicle (V2V) services as part of LTE Rel-14 enhancements, including unicast, multicast, and sidelink transport options. This paper summarizes the present status of 3GPP standardization, evaluates the different LTE based transport options, and compares the performance of LTE to an alternative V2V transport based on the IEEE 802.11p standard. Our investigations show that LTE multicast is more efficient than LTE unicast, which is constrained by limited downlink resources. We also observe a performance trade-off between LTE multicast and sidelink, where for high system load sidelink provides better reliability than LTE multicast for shorter communication ranges, while multicast outperforms sidelink for longer ranges. Finally, our results show that both LTE multicast and LTE sidelink outperform IEEE 802.11p in range and reliability for the considered scenarios.

Space-Time Block Coding for Wireless Communications

Abstract: II

User terminal, radio base station and radio communication method

Abstract: The present invention is designed to provide a user terminal, a radio base station and a radio communication method of novel structures that can achieve a good communication environment. A radio base station non-orthogonal-multiplexes downlink signals for a plurality of user terminals over a given radio resource, a user terminal having received the downlink signals for the plurality of user terminals decodes downlink signal for another user terminal, judges whether or not the downlink signal for the other user terminal has been successfully received, based on the decoding result of the downlink signal, reports a judgement result as to whether or not the downlink signal for the other user terminal has been successfully received and a judgement result as to whether or not a downlink signal for the user terminal has been successfully received, to the radio base station, and then the radio base station executes retransmission control of downlink signals based on reports from the user terminal.

Telecommunications apparatus and methods

Abstract: A wireless telecommunication system comprises base stations for communicating with terminal devices. One or more base stations support a power boost operating mode in which a base station's available transmission power is concentrated in a subset of its available transmission resources to provide enhanced transmission powers as compared to transmission powers on these transmission resources when the base station is not operating in the power boost mode. A base station establishes an extent to which one or more base stations in the wireless telecommunications system support the power boost operating mode conveys an indication of this to a terminal device. The terminal device receives the indication and uses the corresponding information to control its acquisition of a base station of the wireless telecommunication system, for example by taking account of which base stations support power boosting and/or when power boosting is supported during a cell attach procedure.

Network architecture, methods, and devices for a wireless communications network

Abstract: Methods and apparatus in a fifth-generation wireless communications, including an example method, in a wireless device, that includes receiving a downlink signal comprising an uplink access configuration index, using the uplink access configuration index to identify an uplink access configuration from among a predetermined plurality of uplink access configurations, and transmitting to the wireless communications network according to the identified uplink access configuration. The example method further includes, in the same wireless device, receiving, in a first subframe, a first Orthogonal Frequency-Division Multiplexing (OFDM) transmission formatted according to a first numerology and receiving, in a second subframe, a second OFDM transmission formatted according to a second numerology, the second numerology differing from the first numerology. Variants of this method, corresponding apparatuses, and corresponding network-side methods and apparatuses are also disclosed.