This paper proposes a route optimization scheme for three-dimensional wireless mesh networks implemented by using formation flying of autonomous unmanned aerial vehicles, also known as drones. Inter-drone communication above the ground can achieve free space propagation as obstacles are eliminated. However, transmission efficiency can be degraded due to sneak path interference inside the drone [1].

In this paper, based on formation flight related work [2] suitable for drone communications, we theoretically analyze this interference by directional beams and propose an optimal route selection scheme with high transmission rate.

Location-based services (LBS) achieve information sharing based on each user’s location and demand. However, LBS platform providers require abundant network resources since they have to replicate and disseminate the published content to the subscribers as a broker. Therefore, a user or an organization, having few resources, is difficult to be a standalone LBS platform provider or content publisher without a broker as they need to address network traffic for the enormous subscribers, and they need to have a way to manage all the subscribers’ information. This letter proposes user-centric location-oriented content dissemination based on peer-to-peer and device-to-device communications.

A topology control method for mobile ad hoc networks is proposed, in which the optimal topology of each topology update interval is adopted by considering both the dynamic positions of one-hop neighboring nodes and cumulative energy consumption to send data over the update interval. This approach of adopting the topology optimized over the update interval differs from an existing approach in which the topology update frequency is increased. Through performance simulation, conditions under which the proposed method is applicable are revealed by comparing the energy consumption of the proposed method to that of the existing method. Additionally, the proposed method is practical because it takes only several tens of milliseconds to determine the optimal topology even when using a CPU widely used for embedded devices.

This paper proposes a dual-band planar antenna composed of asymmetric dipole elements backed by a conducting reflector that is realized by incorporating a LC trap circuit. The proposed antenna achieves the 2.4 GHz and 5 GHz dual-band operations for the purpose of WLAN applications. It is shown that the measured gains were 3.0 dBi at 2.44 GHz, 5.3 dBi at 5.25 GHz, and 5.8 dBi at 5.6 GHz, respectively. It is also confirmed that this antenna approximately retains a unidirectional property and a superdirectivity as well.

This letter proposes a mobile-assisted ad hoc networking architecture based on location information. The proposed architecture comprises the location layer and ad hoc layer. The location layer performs to manage the locations of nodes and to determine the area of ad hoc network virtually based on locations via mobile networks. The ad hoc layer performs to establish an actual route based on the virtual area and to send data along the established route via local networks. The proposed architecture achieves the significant reduction of the unnecessary packets and the improvement of the packet arrival rate.