Relaying technology is an essential part of 3GPP LTE-Advanced (3 Generation Partnership Project Long Term Evolution Advanced). This paper evaluates the path loss encountered on the backhaul link of relaying systems. The evaluation is based on an extensive measurements performed in 1900 MHz frequency band. The validity of different propagation models for multiple relay antenna heights is examine...

In this paper, we study the hand-off performance of a wireless system with heterogeneous technologies called iCAR (Integrated Cellular and Ad hoc Relaying). In iCAR, hand-offs can occur not only from a Base Transceiver Station (BTS) to another BTS, but also from a BTS to a so-called Ad hoc Relaying Station (ARS) in the form of relaying, as well as from an ARS back to a BTS. The latter two types...

Abstract—Energy-efficient communication techniques play great roles in applications where devices are powered by batteries. Relaying is viewed as an energy saving technique because it can reduce the transmit power by breaking one long range transmission into several short range transmissions. TwoWay Relaying Transmission (TWRT) is expected to consume less transmit power than One-Way Relaying T...

In wireless communication systems, the capacity of a cell (the amount of correctly delivered traffic in unit time) is a precious resource that can not be arbitrarily increased. This paper looks at the consequences limited transmission power has for the cell capacity and how these limitations can be overcome by using relaying between terminals. The challenge faced here is that we require the rel...

The paper presents peer-to-peer multi-agent framework for community clustering based on contact propagation in the global network of contacts with individual ontology-based descriptions. The framework allows people to meet interested parties by specifying flexible ontologybased requests and/or proposals and relaying them between the nodes of the system along the most ontologically-prominent dir...

To satisfy the stringent requirement of capacity enhancement in wireless networks, cooperative relaying is envisioned as one of the most effective solutions. In this paper, we study the capacity enhancement problem by way of Relay Stations (RSs) placemen to achieve an efficient and scalable design in nextgeneration relay-based broadband wireless access networks. To fully exploiting the performa...

Integrated cellular and ad hoc relaying systems (iCAR) is a new wireless system architecture based on the integration of cellular and modern ad hoc relaying technologies. It addresses the congestion problem due to unbalanced traffic in a cellular system and provides interoperability for heterogeneous networks. The iCAR system can efficiently balance traffic loads between cells by using ad hoc r...

In the Vehicular ad hoc networks (VANETs), due to the high mobility of vehicles, the network parameters change frequently and the information which the sender maintains may outdate when it wants to transmit data packet to the receiver, so for improving the routing effective, we propose the probability prediction based reliable (PRO) opportunistic routing for VANETs. The PRO routing algorithm c...

In this paper, two different transmission schemes which are based on the joint consideration of two-way relaying and direct link transmission are proposed. The considered scenario consists of two half-duplex multi-antenna nodes which want to bidirectionally exchange information under asymmetric data rate requirements. To enable the communications, the nodes can either perform transmissions via ...

We consider “virtual” full-duplex relaying by means of half-duplex relays. In this configuration, each relay stage in a multi-hop relaying network is formed by at least two relays, used alternatively in transmit and receive modes, such that while one relay transmits its signal to the next stage, the other relay receives a signal from the previous stage. With such a pipelined scheme, the source ...