Driven by increasing demands on connectivity to improve safety, situational awareness and operational effectiveness for first responders, more public safety agencies are realizing the need of modernization their existing non-3GPP networks. 3GPP based cellular networks offer unique opportunity providing fast, reliable, prioritized communications responders in a shared network. In this article, we give an overview service requirements mission critical communications. We identify key technical...

The recent and upcoming releases of the 3rd Generation Partnership Project's 5G New Radio (NR) specifications include features that are motivated by providing connectivity services to a broad set verticals, including automotive, rail, air transport industries. Currently, several radio access network being further enhanced or newly introduced in NR improve 5G's capability provide fast, reliable, non-limiting for applications. In this article, we review most important characteristics...

Vehicular wireless channels are highly time-varying and the pilot pattern in 802.11p orthogonal frequency-division multiplexing frame has been shown to be ill suited for long data packets. The high error rate off-the-shelf chipsets with noniterative receiver configurations is mostly due use of outdated channel estimates equalization. This paper deals improving estimation systems using a cross layered approach, where known bits inserted higher layers modified makes these as training improved...

Robust channel estimation in IEEE 802.11p systems highly time- and frequency-varying vehicular channels, combination with long data packets, is a challenging task due to the ill-suited pilot pattern. Solutions of increased receiver complexity that use decision feedback iterative decoding have been proposed overcome difficulty robust estimation. In this paper, cross-layered method introduce complementary training symbols into an frame proposed. approach, known bits are multiplexed higher...

For critical vehicular communication services, such as traffic safety and efficiency, it is advisable to design systems with robustness the main criteria, possibly at price of reduced peak performance efficiency. We describe a simple, low-cost method for combining output L directional (i.e., not omnidirectional) antennas input single-port receiver aim guarantee robustness, i.e., minimize probability that K consecutive packets arriving from worst-case angle-of-arrival are decoded incorrectly....

In this paper, we analyze a carrier-sense multiple access system with all-to-all broadcast data traffic to assess the performance gain obtained by using sector antennas and receiver setup that can decode packets simultaneously when arrive in narrow angle of arrivals. mode IEEE 802.11p-based vehicle-to-vehicle communications, acknowledgment messages are absent fixed contention window is used medium access. As result, probability vehicles transmitting packet increases number vehicles. case...

Public safety operations require fast and reliable mission critical communications under various scenarios, in which the availability of wireless connectivity can be a question life or death. To provide when where it counts, we have witnessed growing demand for deployable networks public natural disasters emergency situations. This article investigates opportunities using 5th generation (5G) new radio (NR) standard designing flexible networks. We describe use cases an overview 5G network...

Deployable networks are foreseen to be one of the key technologies for public safety in fifth generation (5G) mobile communications and beyond. They can used complement existing cellular provide temporary on-demand connectivity emergency situations. However, operating deployable coexistence with challenging from an interference perspective. To gain insights on deployment strategy networks, this article, we present extensive numerical study coverage analysis, considering four different...

Public safety operations require fast and reliable mission critical communications under various scenarios, in which the availability of wireless connectivity can be a question life or death. To provide when where it counts, we have witnessed growing demand for deployable networks public natural disasters emergency situations. This article investigates opportunities using fifth generation (5G) new radio (NR) standard designing flexible networks. We describe use cases an overview 5G network...

Driven by increasing demands on connectivity to improve safety, situational awareness and operational effectiveness for first responders, more public safety agencies are realizing the need of modernization their existing non-3GPP networks. 3GPP based cellular networks offer unique opportunity providing fast, reliable, prioritized communications responders in a shared network. In this article, we give an overview service requirements mission critical communications. We identify key technical...

The availability of time-variability information a channel between network node and user equipment at the side allows 5G to optimally configure its parameters maximize both system performance. In Release 18 enhancements 5G-Advanced, time-domain property (TDCP) feedback that indicates degree is being standardized. this article, we describe standardized TDCP applications. benefit further illustrated through numerical evaluations.

For critical services, such as traffic safety and efficiency, it is advisable to design systems with robustness the main criteria, possibly at price of reduced peak performance efficiency. Ensuring robust communications in case embedded or hidden antennas a challenging task due nonisotropic radiation patterns these antennas. The challenges can be overcome use multiple In this paper, we describe simple, low-cost method for combining output guarantee robustness, i.e., support reliable...

For critical vehicular communication services, such as traffic safety and efficiency, it is advisable to design systems with robustness the main criteria, possibly at price of reduced peak performance efficiency. We describe a simple, low-cost method for combining output L nonideal (i.e., nonisotropic) antennas input signal single-port receiver aim guarantee robustness, i.e., minimize probability that K consecutive packets arriving from worst-case angle-of-arrival are decoded incorrectly. To...

Deployable networks are foreseen to be one of the key technologies for public safety in fifth generation (5G) mobile communications and beyond. They can used complement existing cellular provide temporary on-demand connectivity emergency situations. However, operating deployable coexistence with challenging from an interference perspective. To gain insights on deployment strategy networks, this article, we present extensive numerical study coverage analysis, considering four different...

The recent and upcoming releases of the 3rd Generation Partnership Project's 5G New Radio specifications include features that are motivated by providing connectivity services to a broad set verticals, including automotive, rail, air transport industries. Currently, several radio access network being further enhanced or newly introduced in NR improve 5G's capability provide fast, reliable, non-limiting for applications. In this article, we review most important characteristics requirements...