Performance Analysis of Dynamic PUCCH Allocation Algorithm in LTE Network

The aim of the presented paper was to verify the impact of Dynamic PUCCH Resource Allocation Algorithm of the LTE cellular system on the maximum uplink cell throughput and call setup success rate - CSSR. Paper includes the laboratory testbed description and presents the results of an experiment confirming the improvement of both key performance indicators KPIs. Apart from the presentation of the Dynamic PUCCH Resource allocation algorithm, the paper also includes a description of legacy LTE uplink (PUCCH and PUSCH) channels dimensioning process thus filling the gap of such a tutorial in the available literature

3GPP LTE Release 9 and 10 requirement analysis to physical layer UE testing

The purpose of this thesis was to analyze the testing requirements to physical layer features which are used in LTE Release 9 and 10 timeframe. The aim of the analysis was to define test case requirements for new features from the physical layer point of view. This analysis can then be utilized to implement and design test cases using commercial eNB simulators. The analysis was carried out by studying the 3GPP specifications and by investigating the integration and system level testing requirements. Different feature specific parameters were evaluated and different testing aspects were studied in order to verify the functionalities and performance of the UE. Also, different conformance test case scenarios and field testing aspects were investigated in order to improve the test case planning in the integration and system testing phase. The analysis showed that in Rel-9 there are two main features which have a great impact on the Rel-9 physical layer testing. These two features are the dual-layer beamforming and UE positioning which is done with OTDOA and E-CID methods. It was analyzed that the requirements for the downlink dual-layer beamforming focus on TDD side and the test plan must contain especially throughput performance testing in integration and system phase testing. OTDOA and E-CID methods, on the other hand, need test plans which are concentrating on the positioning accuracy. In Rel-10, the analysis showed that there are plenty of new features on physical layer to ensure the transition from LTE to LTE-Advanced. The main requirements were assigned for the CA feature which has testing activities especially on the UE feedback operations. Also, different kinds of CA deployment scenarios were analyzed to evaluate more closely the initial CA testing scenarios in integration and system testing. Analysis continued with downlink multi-layer beamforming where the requirements were seen to concentrate on new CSI-RS aspects and to throughput performance testing. Uplink MIMO aspects were analyzed at the end and the studies showed that this feature may have a minor role in Rel-10 timeframe and therefore it does not have any important testing requirements which should be taken into account in test plans

LTE Baseband Algorithms for Uplink

LTE is a next generation mobile system from the 3GPP with a focus on wireless broadband.The aim of LTE is to achieve high data rates in both uplink & downlink, and to achieve high spectral efficiencies.The main focus of the work is to develop baseband algorithms in the uplink in order to achieve uplinksynchronization between the user and the base station and also for the detection of the control data that is transmitted. For the base station to obtain the knowledge of the presence of the user and also about its position, the user has to transmit synchronization signals to the base station, which are transmitted on the Physical Random Access CHannel (PRACH) in LTE. These signals are used to obtain the uplink timing correction and hence synchronize with the base station. It is very important for the base station to detect the control data that has been transmitted by the user on Physical Uplink Control CHannel (PUCCH). The control data may consist of the response of the UE to the data packets that were transmitted by the base station, request for resource allocation etc.So efficient algorithms are necessary for the accurate detection of the control data at the base station. The current work presents algorithms that are essential for obtaining uplink synchronization and also for efficient detection of the control channel data

Receiver Design of Uplink Control and Shared Channel in 4G-LTE

This Work focuses on the Receiver Design of Physical Up link Control Channel (PUCCH) and Physical Up link Shared Channel (PUSCH) which includes different channel estimation techniques and different equalization techniques. Simulations are done in Mat lab to verify algorithms. In addition to estimation and equalization algorithms, here i presented Channel Quality Indicator (CQI) decoding algorithm for PUSCH and PUCCH

Digital signal processing waveform aggregation and its experimental demonstration for next generation mobile fronthaul

L'abstract è presente nell'allegato / the abstract is in the attachmen

Carrier aggregation in lte-advanced

Advancement in mobile communication technology has led to an increase in data usage due to smart electronic gadgets. Despite of increased spectrum efficiency the required data rates (1 Gbps) for 4G LTE Advanced system cannot be attained. To attain these very high data rates it is required to increase the transmission bandwidths (up to 100 MHz) over those that can be supported by a single carrier or channel. The technique being proposed is named as carrier aggregation (CA) to aggregate two or more component carriers (CCs). These channels or carriers may be contiguous components of the spectrum, or they may be in different bands resulting in Intra-band contiguous CA, Intra-band non-contiguous CA and Inter-band CA. Carrier aggregation is supported by both formats of LTE, namely the FDD and TDD variants. This guarantees that both FDD LTE and TDD LTE are capable of meeting the high data throughput requirements placed upon them. With carrier aggregation, it is likely to schedule a user equipment (UE) on multiple component carriers simultaneously i.e. multiple spectrum bands are exploited by the same user in order to fulfil the large bandwidth requirement of the service and attain enhanced performance. The first release of 3GPP LTE facilitated extensive support for deployment in spectrum allocations of several characteristics, with transmission bandwidths extending from 1.4MHz up to 20MHz in both paired and unpaired bands. One of the most significant features to drift from LTE system to LTE-A system is Carrier aggregation. Furthermore an LTE Advanced user is backward compatible with LTE. Carrier aggregation is a multi-carrier technique, where vacant SCC (Secondary Component Carrier) is combined with the PCC (Primary Component Carrier) that is allocated to the user equipment. Five component carriers each of 20 MHz are combined to increase bandwidth to 100 MHz for high data rates

An Enhanced Feedback-Base Downlink Packet Scheduling Algorithm for Mobile TV in WIMAX Networks

With high speed access network technology like WIMAX, there is the need for efficient management of radio resources where the throughput and Qos requirements for Multicasting Broadcasting Services (MBS) for example TV are to be met. An enhanced feedback-base downlink Packet scheduling algorithm that can be used in IEEE 802.16d/e networks for mobile TV “one way traffic”(MBS) is needed to support many users utilizing multiuser diversity of the broadband of WIMAX systems where a group of users(good/worst channels) share allocated resources (bandwidth). This paper proposes a WIMAX framework feedback-base (like a channel-awareness) downlink packet scheduling algorithm for Mobile TV traffics in IEEE806.16, in which network Physical Timing Slots (PSs) resource blocks are allocated in a dynamic way to mobile TV subscribers based on the Channel State information (CSI) feedback, and then considering users with worst channels with the aim of improving system throughput while system coverage is being guaranteed. The algorithm was examined by changing the PSs bandwidth allocation of the users and different number of users of a cell. Simulation results show our proposed algorithm performed better than other algorithms (blind algorithms) in terms of improvement in system throughput performance. Doi: 10.12777/ijse.5.1.55-62 [How to cite this article: Oyewale, J. and , Juan, L.X.. (2013). An Enhanced Feedback-Base Downlink Packet Scheduling Algorithm for Mobile TV in WIMAX Networks. International Journal of Science and Engineering, 5(1),55-62. Doi: 10.12777/ijse.5.1.55-62

Performance analysis of interference measurement methods for link adaptation in 5G New Radio

5G New Radio (NR) is coming faster than expected with early deployments which take place early 2019. It is more than a new mobile generation that offers higher data rates compared to previous generations, although it’s still the main driver. It will enable many new use cases and deployment scenarios that can be put into three main categories: enhanced mobile broad band (eMBB), ultra-reliable low latency communications (URLLC) and massive machine type communications (mMTC). 5G NR aims to further increase frequency resources utilization and efficiency. Cell edge users usually suffer from high levels of interference known as inter-cell interference. This phenomenon results in lower performance for the cell edge users and inefficient utilization of radio resources. Link adaptation techniques aim to increase cell edge performance by exploiting varying channel conditions and interference level at user equipment (UE). In this thesis channel state information (CSI) is studied as an essential part of link adaptation process. Channel quality indicator (CQI) is the main component of CSI reports from UE that gives recommendations about the next transmission modulation order and code rate. The accuracy of reported CQI depends on the accuracy of channel and interference measurements. In this thesis two different interference measurement methods based on two reference signals are studied: CSI interference measurement (CSI-IM) and non-zero power CSI reference signal (NZP CSI-RS). In this thesis performance with different configurable factors, different channel models and UE speeds are considered. Overall system overhead is also studied to give recommendation about the configuration of lower system overhead. Simulation results has shown that CSI-IM based interference measurement is more efficient compared to NZP CSI-RS method and operates well in different channel scenarios and different UE speed. While NZP CS-RS shows sensitivity to frequency selective channels and in higher user mobility cases. On the other hand, from overall system overhead perspective, CSI-IM based configuration is the best solution