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With the rapid growth of bandwidth-intensive applications, Carrier Aggregation (CA) has been introduced in Long Term Evolution-Advanced (LTE-A) Networks to provide higher data rates. In this paper, we investigate the joint resource block allocation and link adaptation problem with CA in LTE-A dwonlink. The problem is formulated as an Integer Programming problem aimed at maximizing the cell throughtput...
Cell handover has been considered as one of the most challenging issues in LTE-A macro-femtocell networks, due to the ad hoc deployment nature of Femto Base Stations (FBSs). In this paper, our goal is to achieve seamless handover of Mobile Terminal (MT) among different cells while improving the system throughput. First, we formulate the handover decision and channel allocation problem as a Markov...
Femtocell is an efficient solution for mobile operators to expand indoor coverage and increase network capacity. In this paper, we study the downlink resource allocation problem of two-tier macrocell-femtocell networks. We first formulate the problem as a Mixed Integer Non-Linear P rogram (MINLP) which aims to maximize the capacity of clustered femtocell networks subject to hard delay constraints...
In the era of big data, data intensive applications have posed new challenges to the filed of service composition, i.e. composition efficiency and scalability. How to compose massive and evolving services in such dynamic scenarios is a vital problem demanding prompt solutions. As a consequence, we propose a new model for large-scale adaptive service composition in this paper. This model integrates...
This paper addresses the issue of packet scheduling with spatial division multiplexing (SDM) techniques of multiple input multiple output (MIMO) antenna in the 3GPP Long Term Evolution (LTE) downlink. Considering the restricted condition of selecting SDM techniques, a novel packet scheduling algorithm with quality of service (QoS) support in LTE downlink MIMO system, named QoS-DMO, is proposed. QoS-DMO...
The last decade has seen an explosive growth in wireless network services and consequently an increasing demand of high data rates on wireless networks, and the demand of users on real-time traffic is growing. The quality of service (QoS) requirements of different applications are different, for example, the real-time applications are delay-sensitive, yet can tolerant certain data loss. An intrinsic...
To deal with the problem that cognitive information and queuing information are not both taken into account when performing Resource Allocation (RA), we have proposed a cross-layer RA scheme in a multiuser cognitive system with Orthogonal Frequency Division Multiple Access (OFDMA). In this scheme, we assume that several crucial factors influence the RA decision, including subchannel occupancy state,...
Railway transportation is regarded as the safest and most economical way of transportation on land. However, the delay of train makes it inconvenient for both railway work crews and passengers. As the high-speed railways which can reach a speed of over 350 km/h are booming up, train delay is becoming more and more important. On this concern, this article gives out a definition of expected punctual...
With the popularization of mobile wireless networks in recent year, we can expect that the future mobile communication environments will be constructed from networks of different coverages and characteristics. The integration of WiMAX and femtocell technologies seems to be a feasible option for better and cheaper wireless coverage extension. It is well-known that WiMAX femtocells are currently under...
As mobile wireless networks increase in popularity and pervasiveness, using internet ubiquitously isn't a dream. The future Wireless Internet is expected to consist of different types of wireless network with different coverage ranges. The integration of Wireless Metropolitan Area Network (WMAN) and Wireless Local Area Network (WLAN) technologies seems to be a feasible option for better and cheaper...
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