Non-orthogonal multiple access (NOMA) has been widely recognized as a promising way to scale up the number of users, enhance spectral efficiency, and improve user-fairness in wireless networks, by allowing more than one user share resource. NOMA can be flexibly combined with many existing technologies emerging ones including multiple-input multiple-output (MIMO), massive MIMO, millimeter wave communications, cognitive cooperative visible light physical layer security, energy harvesting,...

An energy-harvesting sensor node that is sending status updates to a destination considered. The equipped with battery of finite size save its incoming energy, and consumes one unit energy per update transmission, which delivered the instantly over an error-free channel. setting online in harvested revealed causally time after it arrives, goal design transmission times (policy) such long term average age information (AoI) minimized. AoI defined as elapsed since latest has reached at...

Federated learning (FL) is a machine model that preserves data privacy in the training process. Specifically, FL brings directly to user equipments (UEs) for local training, where an edge server periodically collects trained parameters produce improved and sends it back UEs. However, since communication usually occurs through limited spectrum, only portion of UEs can update their upon each global aggregation. As such, new scheduling algorithms have be engineered facilitate full...

We consider an energy harvesting two-hop network where a source is communicating to destination through relay. During given communication session time, the collects measurement updates from physical phenomenon and sends them relay, which then forwards destination. The objective send these as timely possible; namely, such that total age of information minimized by end session, subject causality constraints at data Both relay use fixed, yet possibly different, transmission rates. Hence, each...

We consider an energy harvesting sensor that is sending measurement updates regarding some physical phenomenon to a destination. The relies on harvested from nature measure and send its updates, equipped with battery of finite size collect energy. process Poisson unit rate, arrives in amounts fully recharge the battery. Our setting online sense times arrivals are revealed causally after harvested; only statistics arrival known priori. Updates need be sent timely manner destination, namely,...

A two-hop energy harvesting communication network is considered, in which measurement updates are transmitted by a source to destination through an intermediate relay. Updates be sent timely fashion that minimizes the age of information, defined as time elapsed since most recent update at was generated source. The and relay communicate using harvested from nature, stored infinite-sized batteries. Both nodes use fixed transmission rates, hence incur delays (service times). Two problems...

Optimization of information freshness in wireless networks has usually been performed based on queueing analysis that captures only the temporal traffic dynamics associated with transmitters and receivers. However, effect interference, which is mainly dominated by interferers' geographic locations, not well understood. In this paper, we leverage a spatiotemporal model, allows one to characterize age (AoI) from joint queueing-geometry perspective, for design decentralized scheduling policy...

We consider an energy harvesting source that is collecting measurements from a physical phenomenon and sending updates to destination within communication session time. Updates incur transmission delays are function of the used in their transmission. The more per update, faster it reaches destination. goal transmit timely manner, namely, such total age information minimized by end session, subject causality constraints. two variations this problem. In first setting, controls number...

A sensor node that is sending measurement updates regarding some physical phenomenon to a destination considered. The relies on energy harvested from nature transmit its updates, and equipped with finite <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">B</i> -sized battery save energy. Energy recharges the xmlns:xlink="http://www.w3.org/1999/xlink">incrementally</i> in units, according Poisson process, one update consumes unit reach destination....

An energy harvesting sensor that is sending status updates to a destination through an erasure channel considered, in which transmissions are prone being erased with some probability q, independently from other transmissions. The sensor, however, unaware of events due lack feedback the destination. Energy expenditure normalized sense one transmission consumes unit energy. equipped unit-sized battery save its incoming energy, arrives according Poisson process rate. setting online, arrival...

We consider the effects of decoding costs in energy-harvesting communication systems. In our setting, receivers, addition to transmitters, rely solely on energy harvested from nature, and need spend some order decode their intended packets. model as an increasing convex function rate incoming data. this traditional causality constraints at we have where spent by receiver for cannot exceed its energy. first point-to-point single-user problem goal is maximize total throughput a given deadline...

A downlink single-input single-output non-orthogonal multiple access setting is considered, in which a base station (BS) communicating with two legitimate users possible scenarios of unsecure environments: existence an external eavesdropper and through untrusted relay. For the first scenario, number trusted cooperative half-duplex relays employed to assist BS's transmission secure its signals from eavesdropper. Various relaying schemes are proposed analyzed for that matter: jamming,...

A real-time status updating system is considered, in which an energy harvesting sensor acquiring measurements regarding some physical phenomenon and sending them to a destination through erasure channel. The setting online, arrives units according Poisson process with unit rate, arrival times being revealed causally over time. Energy saved unit-sized battery. notified by the of whether updates were erased via feedback. Updates need reach successfully timely fashion, namely, such that long...

A status updating communication system is examined, in which a transmitter communicates with receiver over noisy channel. The goal to realize timely delivery of fresh data time, assessed by an age-of-information (AoI) metric. Channel coding used combat the channel errors, and feedback sent acknowledge updates' reception. In case decoding unsuccessful, hybrid ARQ protocol employed, incremental redundancy (IR) bits are transmitted enhance ability. This continues for some amount time remains...

The notion of timely status updating is investigated in the context cloud computing. Measurements a time-varying process interest are acquired by sensor node, and uploaded to server undergo some required computations. These computations have random service times that independent identically distributed across different uploads. After done, results delivered monitor, constituting an update. goal keep monitor continuously fed with fresh updates over time, which assessed age-of-information(AoI)...

A visible light communication broadcast channel is considered, in which a transmitter luminaire communicates with two legitimate receivers the presence of an external eavesdropper. number trusted cooperative half-duplex relay luminaires are deployed to aid securing transmitted data. Transmitters equipped single fixtures, containing multiple emitting diodes, and receiving nodes photo-detectors, rendering considered setting as single-input single-output system. Transmission...

The impact of local averaging on the performance federated learning (FL) systems is studied in presence communication delay between clients and parameter server. To minimize effect delay, are assigned into different groups, each having its own server (LPS) that aggregates clients' models. groups' models then aggregated at a global (GPS) only communicates with LPSs. Such setting known as hierarchical FL (HFL). Unlike most works literature, number rounds our work randomly determined by...

We study the effects of decoding and processing costs in an energy harvesting two-way channel. design optimal offline power scheduling policies that maximize sum throughput by a given deadline, subject to causality constraints, at both users. In this system, each user spends transmit data other user, also decode coming from user; is, divides its harvested for transmission reception. Further, incurs cost per unit time as long it communicates. The needed incoming is modeled increasing convex...

We introduce the concept of a fresh data market, in which destination user requests, and pays for, updates from source provider. Data freshness is captured by age information (AoI) metric, defined as time elapsed since latest update has reached destination. The incurs an operational cost, modeled increasing convex function number updates. age-related AoI. charges for each designs pricing mechanism to maximize its profit; on other hand chooses schedule minimize summation payments cost....

We introduce the concept of fresh data trading, in which a destination user requests, and pays for, updates from source provider, freshness is captured by age information (AoI) metric. Keeping relies on costly frequent source, motivates to price data. In this work, incurs an age-related cost, modeled as general increasing function AoI. The designs pricing mechanism maximize its profit, while chooses update schedule trade off payments cost. Depending different real-time applications...

The effects of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">quantization</i> and xmlns:xlink="http://www.w3.org/1999/xlink">coding</i> on the estimation quality Gauss-Markov processes are considered, with a special attention to Ornstein-Uhlenbeck process. Samples acquired from process, quantized, then encoded for transmission using either xmlns:xlink="http://www.w3.org/1999/xlink">infinite incremental redundancy</i> (IIR) or...

A status updating system is considered in which data from multiple sources are sampled by an energy harvesting sensor and transmitted to a remote destination through erasure channel. The goal deliver updates of all timely manner, such that the cumulative long-term average <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">age-of-information</i> (AoI) minimized. AoI for each source defined as time elapsed since generation latest successful update...

We investigate the age-of-information (AoI) in context of random access networks, which transmitters need to send a sequence information packets intended receivers over shared spectrum. establish an analytical framework that accounts for key features wireless system, including fading, path loss, network topology, as well spatial interactions amongst queues. A closed-form expression is derived quantity average AoI and its accuracy verified via simulations. Our analysis unveils several...

We investigate the age-of-information (AoI) in context of random access networks, which transmitters need to send a sequence information packets intended receivers over shared spectrum. Due interference, dynamics at link pairs will interact with each other both space and time, effects these spatiotemporal interactions on AoI are not well understood. In this paper, we straddle queueing theory stochastic geometry establish an analytical framework, that accounts for interplay between temporal...

We consider power scheduling policies for single-user energy harvesting communication systems, where the goal is to characterize online that maximize long term average utility, general concave and monotonically increasing utility functions. The transmitter relies on harvested from nature send its messages receiver, equipped with a finite-sized battery store energy. Energy packets are independent identically distributed (i.i.d.) over time slots, revealed causally transmitter. first optimal...