We analyze Coordinated Multi-Point (CoMP) transmission and reception over heterogeneous wireless networks (HetNets). Our focus is on the design of a practical algorithm for joint resource allocation (joint scheduling) in each HetNet cluster. We present one such algorithm together with its detailed analysis and evaluation under two different approaches for obtaining and utilizing channel feedback […]
Read moreOne of the key elements of radio resource management in mobile networks is MAC (Media Access Control) scheduling. The scheduling algorithms play a role in overall network performance and are not specified in the Long Term Evolution (LTE) standards. This paper describes how to assess the performance of a scheduler implementation by designing an adaptive […]
Read moreLTE-Advanced networks employ random access based on preambles transmitted according to multi-channel slotted Aloha principles. The random access is controlled through a limit W on the number of transmission attempts and a timeout period for uniform backoff after a collision. We model the LTE-Advanced random access system by formulating the equilibrium condition for the ratio of […]
Read moreA 2.6 GHz cascode CMOS power amplifier with the derivative superposition (DS) method and the second harmonic control for LTE application is fabricated in TSMC 1P6M 0.18 μm standard CMOS process. The DS method uses two transistors connected in parallel and biased in low and high inversions to compensate for the gm3 and achieves the greater third-order intercept […]
Read moreThe roof of an automobile would appear to be an ideal platform to place multiple-input-multiple-output (MIMO) antennas, having a large ground plane with plenty of space to separate antennas for optimum embedded element radiation efficiency. However, styling concerns often require that the antennas are to be placed close together. Thus, mutual coupling plays an important […]
Read moreLTE-Advanced employs Orthogonal Frequency-Division Multiplexing (OFDM), Carrier Aggregation (CA), Multi Input Multi Output (MIMO), Co-ordinated Multi-Point Transmission (CoMP) and Relay Station state of the art techniques to significantly enhance transmission performance and extend BS service coverage. On the other hand, Femtocell, specified in 3GPP Rel-8, has the advantages of low power consumption, zero-touch PnP, low […]
Read more
No Comments
Efficient downlink scheduling with discontinuous reception (DRX) mechanism in LTE network
Long Term Evolution (LTE) is being widely deployed to support real-time applications, such as voice over IP and video games. These power consuming applications create new challenges for resource allocation. Therefore, providing efficient resource allocation as well as extending user equipment’s (UE) battery lifetime are two important goals in LTE network. Maximum Largest Weighted Delay First (M-LWDF) […]
Read moreThe communication delay, which has great impact on vehicle-to-infrastructure (V2I) networks, faces a large challenge on account of complex network topology. In this paper, a novel architecture that integrates LTE networks with IEEE 802.11 based Vehicle Ad Hoc Networks (VANETs) is proposed, due to their high data transmission rates and wide coverage area, respectively. The proposed scheme […]
Read moreIn this paper, we discuss several Coordinated Multi-Point (CoMP) schemes proposed for LTE- Advanced systems. We investigate their benefits in a multi-antenna beamforming system where multiple cells may share their resources and jointly coordinate their transmissions to improve the performance at cell edge and the overall system capacity. We evaluate the system performance by combining flow-level […]
Read moreReliable and repeatable video quality assessment is essential for performance analysis of wireless multimedia applications in the third generation (3G) Long Term Evolution (LTE) network. In this article we report on a database containing subjective assessment scores and the corresponding Quality-of-Service parameters of 70 video test sequences encoded with H.264, which are corrupted when transmitted […]
Read more