43 research outputs found
Signaling Design for Cooperative Resource Allocation and its Impact to Reliability
Decentralized cooperative resource allocation schemes for robotic swarms are
essential to enable high reliability in high throughput data exchanges. These
cooperative schemes require control signaling with the aim to avoid half-duplex
problems at the receiver and mitigate interference. We propose two cooperative
resource allocation schemes, device sequential and group scheduling, and
introduce a control signaling design. We observe that failure in the reception
of these control signals leads to non-cooperative behavior and to significant
performance degradation. The cause of these failures are identified and
specific countermeasures are proposed and evaluated. We compare the proposed
resource allocation schemes against the NR sidelink mode 2 resource allocation
and show that even though signaling has an important impact on the resource
allocation performance, our proposed device sequential and group scheduling
resource allocation schemes improve reliability by an order of magnitude
compared to sidelink mode 2
FR2 5G Networks for Industrial Scenarios: An Experimental Characterization and Beam Management Procedures in Operational Conditions
Industrial environments constitute a challenge in terms of radio propagation
due to the presence of machinery and the mobility of the different agents,
especially at mmWave bands. This paper presents an experimental evaluation of a
FR2 5G network deployed in an operational factory scenario at 26 GHz. The
experimental characterization, performed with autonomous mobile robots that
self-navigate the industrial lab, leads to the analysis of the received power
along the factory and the evaluation of reference path gain models. The
proposed assessment deeply analyzes the physical layer of the communication
network under operational conditions. Thus, two different network
configurations are assessed by measuring the power received in the entire
factory, providing a comparison between deployments. Additionally, beam
management procedures, such as beam recovery, beam sweeping or beam switching,
are analyzed since they are crucial in environments where mobile agents are
involved. They aim for a zero interruption approach based on reliable
communications. The results analysis shows that beam recovery procedures can
perform a beam switching to an alternative serving beam with power losses of
less than 1.6 dB on average. Beam sweeping analysis demonstrates the prevalence
of the direct component in Line-of-Sight conditions despite the strong
scattering component and large-scale fading in the environment.Comment: 11 pages, 10 figure
Mission-Critical Mobile Broadband Communications in Open Pit Mines
The need for continuous safety improvements
and increased operational efficiency is driving
the mining industry through a transition toward
automated operations. From a communications
perspective, this transition introduces a new set
of high-bandwidth business-critical and mission-critical
applications that need to be met
by the wireless network. This article introduces
fundamental concepts behind open-pit mining
and discusses why this ever-changing environment
and strict industrial reliability requirements
pose unique challenges to traditional broadband
network planning and optimization techniques.
On the other hand, unlike unpredictable disaster
scenarios, mining is a carefully planned activity.
Taking advantage of this predictability element,
we propose a framework that integrates mine
and radio network planning so that continuous
and automated adaptation of the radio network
becomes possible. The potential benefits of this
framework are evaluated by means of an illustrative
example
Comparison of treatment with insulin degludec and glargine U100 in patients with type 1 diabetes prone to nocturnal severe hypoglycaemia:The HypoDeg randomized, controlled, open-label, crossover trial
AIM: To investigate whether the longâacting insulin analogue insulin degludec compared with insulin glargine U100 reduces the risk of nocturnal symptomatic hypoglycaemia in patients with type 1 diabetes (T1D). METHODS: Adults with T1D and at least one episode of nocturnal severe hypoglycaemia during the last 2âyears were included in a 2âyear prospective, randomized, open, multicentre, crossover trial. A total of 149 patients were randomized 1:1 to basalâbolus therapy with insulin degludec and insulin aspart or insulin glargine U100 and insulin aspart. Each treatment period lasted 1âyear and consisted of 3âmonths of runâin or crossover followed by 9âmonths of maintenance. The primary endpoint was the number of blindly adjudicated nocturnal symptomatic hypoglycaemic episodes. Secondary endpoints included the occurrence of severe hypoglycaemia. We analysed all endpoints by intentionâtoâtreat. RESULTS: Treatment with insulin degludec resulted in a 28% (95% CI: 9%â43%; P = .02) relative rate reduction (RRR) of nocturnal symptomatic hypoglycaemia at level 1 (â¤3.9âmmol/L), a 37% (95% CI: 16%â53%; P = .002) RRR at level 2 (â¤3.0âmmol/L), and a 35% (95% CI: 1%â58%; P = .04) RRR in allâday severe hypoglycaemia compared with insulin glargine U100. CONCLUSIONS: Patients with T1D prone to nocturnal severe hypoglycaemia have lower rates of nocturnal symptomatic hypoglycaemia and allâday severe hypoglycaemia with insulin degludec compared with insulin glargine U100