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Orthogonal frequency-division multiplexing (OFDM), with its own advantages of spectral efficiency (SE) enhancement and flexible resource allocation, is a promising basic technique for fulfilling the ever increasing demand for high-data-rate transmission and various service type support for mobile multimedia communications. In the meantime, energy efficiency (EE) has now become a critical metric for...
The growing popularity of the high-end mobile computing devices — smartphones, tablets, notebooks and more — equipped with high-speed network access, enables the mobile user to watch multimedia content from any source on any screen, at any time, while on the move or stationary. In this context, the network operators must ensure smooth video streaming with the lowest service delay, jitter, and packet...
Given the exploding number of mobile subscribers and the quality of service requirements of emerging mobile services specially the multimedia ones, efficient use of the limited network resources has become so important that it is driving development of intelligent resource allocation (RA) algorithms. Whereas link specific RA problems have been widely investigated in the literature targeting either...
3GPP Long-term Evolution (LTE) systems being deployed are fast gaining market shares. High data rates (approaching 100 Mbit/s in the downlink direction and 50 Mbit/s for uplink connections) and small delays are attractive features of LTE. Spectrum flexibility also makes deployment easy on various frequency bands in different parts of the world. However, as LTE offers packet switched services only,...
In the last few years, we have witnessed an explosion of IP connectivity demand, translated into a rapid development of the corresponding technologies in the wireless access network domain. IP services provision anytime and anywhere becomes very challenging and is seen by the mobile operators as a major opportunity for boosting the average revenue per unit. The further success of IP services deployment...
Integrated Mobile Broadcast (IMB) is a technology recently standardized by 3GPP for delivery of broadcast multimedia via a cellular network. IMB is based on WCDMA technology but particularly designed for deployment in 3G TDD spectrum. It employs downlink-only channels using SFN methods, which greatly increase spectral efficiency and capacity for broadcast services. In this paper, we firstly provide...
We study traffic routing in wireless mesh networks, where most of the nodes are fixed and few of them are mobile. We assume real-time multimedia stream communications between a fixed server and mobile nodes. In particular, through simulation we investigate the performance of the BATMAN protocol and compare it against that of some of the most representative schemes for routing in ad hoc and mesh networks...
A cross-layer mechanism for the performance improvement of real-time applications over IEEE 802.16e networks is proposed. The mechanism coordinates i) adaptation capabilities at different layers of the protocol stack, and ii) the handover initiation procedure. It uses information from the physical (PHY) and medium access control (MAC) layers to determine the appropriate burst profile, transmission...
In the frame of the Long Term Evolution (LTE) of mobile networks, the provision of rich multimedia services, such as Mobile TV, is considered of key importance for the LTE proliferation in mobile market. To this end, Multimedia Broadcast/Multicast Service (MBMS) is envisaged to play an instrumental role during LTE standardization process. MBMS was introduced in the Release 6 of Universal Mobile Telecommunication...
The explosive demands of multimedia services have been grown up to support delay-sensitive applications, e.g., VoIP and streaming using codec. When a mobile node (MN) moves across different types of networks, the codec should be effectively adapted according to the significant change of network condition, i.e., throughput and delay. Therefore, in this paper, we propose a codec adaptation for vertical...
The next generation cellular wireless network is expected to provide a broad range of multimedia services, where the traffic asymmetry between uplink and downlink is significant. The code division multiple access system with time division duplex mode (TDD-CDMA), adopting unbalanced slot allocation between uplink and downlink, is a good solution for this traffic asymmetry. Here a QoS adaptive multimedia...
Communications-on-the-move (COTM) is becoming an indispensable feature for next generation satellites. Many commercial and government based satellite communications programs are including support for terminal mobility as a key feature. Adding COTM capabilities to regenerative (non-transponded) satellite systems, such as layer-2 and layer-3 switching satellites impacts the satellite system, network...
The radio coverage of 2.5 GHz mobile WiMAX for five different terrain categories, three antenna modes and 90% service reliability are estimated using a combination of COST-231 Hata and SUI Erceg models. Based on the planned cells, the call holding time in a given cell and channel throughput of the mobile WiMAX for multimedia services are simulated to observe the relationship among vehicle speed, antenna...
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