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The objective of this paper is to combine the antenna downtilt selection with the cell size selection in order to reduce the overall radio frequency (RF) transmission power in the homogeneous High-Speed Packet Downlink (HSDPA) cellular radio access network (RAN). The analysis is based on the concept of small cells deployment. The energy consumption ratio (ECR) and the energy reduction gain (ERG) of...
LTE is currently considered by many wireless operators as their next generation technology. During a transition phase, LTE will be deployed as an overlay on an existing wireless technology, which acts as an underlay. It is expected that initial LTE deployment will be patchy with coverage holes. In this paper, we model and analyze the impact of dual-technology deployment on signaling load at critical...
The IP Multimedia Subsystem (IMS) aims to provide cellular access to all the services that the Internet offers; it is an overlay control layer on top of an IP layer. Wireless Sensor Networks (WSN) with mobile sinks are useful in a wide range of scenarios since they can improve the overall network lifetime and increase data capacity. Combining the capabilities of IMS with the rich set of contextual...
Continuous growth of cellular subscribers as well as demands for high-speed and high-quality multimedia services have made it necessary to increase system capacity and data rate. On the other hand, the energy consumed goes up accordingly as the data rates increases. Therefore, designing an efficient resources allocation scheme and architecture to improve the output performance and reduce energy consumption...
The indoor femtocell technology (known as femto BSs) with low power and low cost is proposed to provide comprehensive indoor wireless converge of macro BSs, which is known as the femtocell network. The Location Area ID for a femtocell is different from that for the macrocell that covers the femtocell, which results in frequent location update procedure (i.e., the location update cost increases) when...
Recently, femtocell has been proposed as a good solution to increase the coverage area and capacity of the wireless communication system as well as meet the increasing demand for high data rate. The femtocell is low-cost, low-power and can be realized by deploying a femto-base-station connected to the core network via a wired-backhaul. Since the femtocell reuses the macrocell spectrum, co-channel...
This paper discusses three current and emerging heterogeneous wireless wide area network architectures, namely, relay-based, direct-access-based, and whitespace-based, architectures that can support incremental wireless data services. For such heterogeneous architectures, the paper suggests a method to estimate the pricing for an incremental wireless data services around an established mean state...
With the rapid development of high-speed railways all over the world, it is very promising to deliver public broadband access to passengers aboard high-speed trains. However, it has been a challenge to support high speed (e.g. above 350 km/h) mobile users with broadband communications, because of rapidly fading radio channels and Doppler frequency shift. This paper presents a review of network architectures...
We propose efficient square-root and division free algorithms for inverse LDLT factorization and the wide-sense Givens rotation, mainly for conventional multiply-add digital computers. The algorithms are then employed to propose a fast algorithm for vertical Bell Laboratories Layered Space-Time architecture (V-BLAST). The proposed inverse LDLT factorization avoids the conventional back substitution...
Dual-Mode handsets containing both WLAN and cellular interfaces are becoming increasingly common. When moving between WLAN and cellular radio coverage,the switching of an active session from one interface to another is referred to as Vertical Handover (VHO). To provide successful VHO the WLAN link has to be maintained until the cellular connection is established. Our previous measurements of the WLAN...
In coordinated multi-point transmission (CoMP) systems, the optimal remote radio unit (RRU) location is analyzed theoretically and a RRU location design scheme for energy efficiency in practical scenarios is given. An average minimum access distance criterion is given for RRU location optimization. By minimizing the average distance between users and RRU, the optimal RRU distribution can be obtained...
Contemporary vehicles offer an advanced telematics platform with multiple applications available such as electronic road tolling, emergency call, breakdown call, or route planning. Given the sensitivity of collected driver and vehicle data and the potential use of this data by third party applications, security mechanisms are needed to protect services as well as data. Although security has been investigated...
We propose a call admission control scheme for soft handoff of CDMA networks based on mobility estimation and mobility history of mobile stations. This work is further improvement of the Eliminating Pseudo Handoff Call (EPHC) proposed by Xiaomin Ma et.al. Therefore we named our proposed scheme as Improved EPHC (IEPHC). The proposed scheme not only improves network throughput but also reduces handoff...
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