3gpp Research Papers - Academia.edu (original) (raw)

The huge demand for mobile communications with broad band and usage of new wireless applications motivated the development of new wireless access technologies. The recent expansion of wireless technologies, novel applications and the advancement in mobile technology after UMTS-3G has been taken up to the next level by the 3GPP Long Tem Evolution/System Architecture Evolution (LTE/SAE). It has achieved the realisation of better bandwidth, full interworking with other access/backend systems using all-IP architecture with well-defined interworking with circuit switched system. The system is defined to work across multiple access networks (3GPP and non 3GPP) may be trusted or non-trusted. The security mechanism in wireless area has evolved from original analog systems through GSM and UMTS. The GSM has focussed the security for radio path whereas UMTS has enhanced it in to network functionalities. The future networks based on IP mechanism demands more security features, since the threats related to IP are also possible.

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- LTE, 3gpp, UMTS, SAE

The Intercell Interference (ICI) problem is one of the main challenges in Long Term Evolution (LTE) downlink system. In order to deal with the ICI problem, this paper proposes a joint resource block and transmit power allocation scheme in LTE downlink networks. The proposed scheme is implemented in three phases: (1) the priority of users is calculated based on interference level, Quality of Service (QoS) and Head of Line (HoL) delay;(2) users in each cell are scheduled on the specified subbands based on their priority; and (3) eNodeBs dynamically control the transmit power using a fuzzy logic system and exchanging messages to each other. Simulation results demonstrate that the proposed priority scheme outperforms the existing Reuse Factor one (RF1) and Soft Frequency Reuse (SFR) schemes in terms of cell throughput, cell edge user throughput, delay and interference level.

Device-to-Device (D2D) communication is a new technology that offer many advantages for the LTE-advanced network such us wireless peer-to-peer services and higher spectral efficiency. It is also considered as one of promising techniques for the 5G wireless communications system and used in so many different fields such as network traffic offloading, public safety, social services and applications such as gaming and military applications. The goal of this paper is to present advances on the current 3GPP LTE-advanced system related to Device-to-Device (D2D). In this paper, we provide an overview of the D2D types based on the communication spectrum of D2D transmission, namely Inband D2D communication and Outband D2D communication. Then we present the advantages and disadvantages of each D2D mode. Moreover, architecture and protocol enhancements for D2D communications under LTE-A network are described.

- by Mohamed Hatem
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- Wireless Communications, VLSI, 3gpp, UMTS
- by Masoud Hamid
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- Wireless Communications, 3gpp, LTE-Advanced

The evolution of wireless telephone technologies can be discretely grouped into various generations based on the level of maturity of the underlying technology. The classification into generations is not standardized on any given metrics or parameters and as such does not represent a strict demarcation. However, it represents a perspective which is commonly agreed upon, both by industry and academia, and hence conceived to be an unwritten standard. At this time, there are two major efforts towards the development of the next generation-"4G" wireless access technology. The 3GPP or 3rd Generation Partnership project (brand named as Long Term Evolution) is the name of the 4G efforts being undertaken in Europe and the 3GPP2 or 3rd Generation Partnership project 2 (brand named as Ultra Mobile Broadband) is the 4G effort of North America and parts of Asia. This survey tries to present an evolutionary and objective sketch to the development efforts of these technologies that mark the future of wide area broadband wireless access technologies.

- by Nuke LucKy
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- Wireless Communications, Multiple-input Multiple-output (MIMO) Systems, 3gpp, Survey
- by Rodrigo Jerez Tapia
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- Electrical Engineering, Architecture, Computer Networks, 3gpp

In this paper, a channel estimator using neural network is presented for Long Term Evolution (LTE) uplink. This paper considers multiuser SC-FDMA uplink transmissions with doubly selective channels. This channel estimation method uses knowledge of pilot channel properties to estimate the unknown channel response at non-pilot sub-carriers. First, the neural network estimator learns to adapt to the channel variations then it estimates the channel frequency response. Simulation results show that the proposed method has better performance, in terms of complexity and quality, compared to the conventional methods least square (LS), MMSE and decision feedback and it is more robust at high speed mobility.

The general packet radio service (GPRS), a data extension of the mobile telephony standard GSM is emerging as the first true packet-switched architecture to allow mobile subscribers to benefit from high-speed transmission rates and run data applications from their mobile terminals. A high-level description of the GPRS system is given with emphasis on services and architectural aspects.

- by Brahim GHRIBI
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- Standards, 3gpp, GSM, GPRS

Abstract—ANFIS is applicable in modeling of key parameters when investigating the performance and functionality of wireless networks. The need to save both capital and operational expenditure in the management of wireless networks cannot be over-emphasized. Automation of network operations is a veritable means of achieving the necessary reduction in CAPEX and OPEX.

- by Aderemi A . Atayero
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- Fuzzy Logic, Neural Network, LTE, 3gpp

This paper aims to show the effect of macrocellular network densification on the capacity, energy and cost efficiency. The presented results are based on radio propagation simulations that consider macrocellular network with different inter-site distances, i.e. different site densities, and also take into account the presence of indoor receiver points by varying outdoor and indoor receiver distribution. It is observed that as a result of densifying the network, the cell spectral efficiency reduces due to increasing level of inter-cell interference. However, as a result of densification, the network area capacity can be improved since the area spectral efficiency increases. Nevertheless, the densification efficiency decreases because of the reduction of cell spectral efficiency, especially when indoor receiver points are taken into account. The results hence indicate that densification of macrocellular network suffers from inefficiency which results in higher energy and cost per bit per Hertz, and thus calls for alternative methods to deploy networks, or alternatively, more sophisticated methods, such as base station coordination or inter-cell interference cancellation techniques, to be implemented for future cellular networks

In this paper we discuss and compare methods to analyse the influence inter-cell interference will have on coverage/outage probabilities in cellular networks. The framework is based on a common method to find the Laplace transform of the distribution of interference from neighbouring cells. It turns out that for Suzuki distributed fading the analysis is highly simplified. In case of Rayleigh faded channels only, the analysis is even more simplified. The modelling approach, which is based on classical probability methods, rather than on modern measure theory for point processes, allows for both fixed and stochastic locations of base stations. The different models are applied to quantify the effect of inter-cell interference on coverage/outage probabilities and on spectrum efficiencies in LTE networks. We consider several scenarios ranging from fixed hexagonal layout of base station to stochastic location of based on uniform distribution of base stations. We also extend the coverage/outage analysis for the Ginibre Point Process to Suzuki faded environment. Numerical examples show large differences in both spectrum efficiency and coverage/outage probabilities for the different network scenarios considered.

The future generation wireless networks are expected to be heterogeneous networks consisting of UMTS, WLAN, WiMAX, LTE etc. A heterogeneous network provides users with different data rate and Quality of Service (QoS). Users of future mobile networks will be able to choose from different radio access technologies. These networks vary widely in service capabilities such as coverage area, bandwidth and error characteristics. Network selection is a challenging task in heterogeneous networks and will influence the performance metrics of importance for both service provider and subscriber. This paper analyses user centric network selection based on QoE (Quality of Experience) which include both technical and economical aspects of the user. WLAN-WiMAX-UMTS networks are integrated and the network selection for the integrated network is performed using game theory based network selection algorithm

The proportional fair (PF) scheduling algorithm compromises between cell throughput and fairness. Many research findings have been published by various researchers about PF algorithm based on mathematical model and simulations. In this paper we have taken the practical route to analyse the algorithm based on three types of subscription. In this benchmarking study, the user subscriptions are differentiated as
Gold, Silver and Bronze schemes and they are provisioned with certain throughputs. Apart from subscriptions plans, the channel condition also plays a major role in determining the throughput. So in order to ensure fairness among different subscriptions even in the bad channel conditions and to deliver the provisioned
throughputs certain priorities are attached with the subscriptions. As per the subscription plans Gold subscribers are assigned with 50% of the speed offered by the network as maximum based on CAT3 speed (100 Mbps in DL and 50 Mbps in UL), Silver is assigned with 25% of the max speed and Bronze is assigned with 12% of the max speed. The priorities assigned to subscribers determines the fairness in
the unfavourable channel conditions - Bronze (high), Silver and Gold (medium). In this paper, an benchmarking tests have been performed with all of three types of subscribers for nearly two hours in the live single cell network without any heterogeneous cells influencing it. Furthermore, the results are
compared with the simulation results.

Received video quality enhancement gained with the implementation of NEWPRED and UEP mechanism is discussed in this paper. Selection of these two methods is justified with details of their implementation. Several MPEG-4 video test bit-streams are transmitted over simulated UMTS environment. Performance enhancement over various channel propagation conditions as standardized by 3GPP for conformance testing in is quantified. Objective video quality assessment is done using standard PSNR metric while near subjective assessment is obtained using Video Quality Metric (VQM) utility. It is observed that in all propagation conditions simulated, implementation of proposed error concealment and mitigation techniques provide considerable improvements in both subjective and objective video quality.

- by fidel uwaya
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- Information Security, Security, Computer Security, LTE