LTE Advanced

About: LTE Advanced is a research topic. Over the lifetime, 4055 publications have been published within this topic receiving 74262 citations. The topic is also known as: Long-Term Evolution Advanced & LTE-A.

Comparative results analysis on positioning with real LTE signals and low-cost hardware platforms

Abstract: Long Term Evolution (LTE) networks are rapidly deploying around the world, covering the needs of high data rates demanded by many applications. Still, less attention is paid on the positioning capabilities specified in the LTE standard. Thus, an experimental LTE positioning receiver is presented to assess the positioning accuracy in commercial LTE deployments. This receiver is based on a software defined radio (SDR) and a low-cost radio-frequency (RF) front-end, such as the universal software radio peripheral (USRP) or a DVB-T dongle with the Realtek RTL2832U chipset. These two platforms are then used to capture and post-process real LTE signals generated in the laboratory. The positioning results obtained show the viability on the use of this experimental SDR LTE positioning receiver with low-cost hardware platforms for commercial LTE networks.

Advanced handover techniques in LTE- Advanced system

Abstract: There are always increasing demands of high speed data applications in wireless systems with fast and seamless access to voice and multimedia services and QoS guaranteed such as in Fourth Generation (4G) Long Term Evolution (LTE)-Advanced system. Moreover, as mobility speeds support is expected to reach up to 500 km/h, the handover will occur more frequent, thus the system performance in terms of delay and packet loss will be degraded. Hence, efficient radio resource management including handover techniques, load balancing and interference management are essential. In this paper, we present a comprehensive survey on the advanced handover techniques, requirements and features for LTE-Advanced system. Also, advanced handover techniques are highlighted and discussed such as Fractional Soft Handover (FSHO), Semi Soft Handover (SSHO) and multi-carrier handover (MCHO) that incorporate backward compatibility to the existing system. Meanwhile, FSHO technique based on CA with 5CCs are investigated in term of cell throughput and user's handover numbers. The result shows that, FSHO with 5 CCs improves LTE-Advanced system in term of cell throughput and numbers of user handover better than Non-CA. Consequently, the existing handover techniques that have been proposed have several advantages, but they are not sufficient to solve hard handover problems. Therefore, a new handover technique is essential required to support fast and seamless handover in LTE-Advanced system. As a result, an advanced handover technique is proposed by combining FSHO, SSHO, and MCHO techniques that can enhance the system performance in term of latency, outage probability and handover reliability especially at cell boundary. Also, the expected output from this hybrid technique can reduce transmission overhead on the network cells by balancing the traffic load in the network cells.

Multi-hop D2D networking and resource management scheme for M2M communications over LTE-A systems

Abstract: Machine-to-Machine (M2M) communications are gaining momentum due to the rapid deployment of smart devices with self-organizing capabilities, able to interact each other without the human operator support. Ultimately, M2M paradigm allows Machine-Type Communication Devices (MTCD) to exchange data in Peer-to-Peer (P2P) mode, avoiding the need of a core network handling end-to-end communication establishment between two machines. To this end, the recent Device-to-Device (D2D) feature, introduced by the Third Generation Partnership Project (3GPP) Release 12, fosters new types of service based on the device proximity concept and helps to offload cellular networks by enabling direct-mode communications among cellular users. Furthermore, D2D is also considered a suitable technology to fully support M2M communications thanks to the reduced power consumption and the hop gain. In this paper we first review crucial aspects of M2M communications and examine major issues involving terminals operating in D2D mode in LTE-A networks. Then, a multi-hop D2D communication scheme is proposed in order to enhance end-to-end connectivity among devices in a proximity area within an LTE-A cell. We also describe a promising resource allocation approach aware of the multi-hop D2D network configuration, able to fulfil bandwidth requests of all the cooperating devices, according to the related role in the network set-up.

TDM-FDM relay backhaul channel for LTE advanced

Abstract: Methods, apparatus and computer program products are provided for receiving a first group of resource blocks, frequency multiplexed in a transmission subframe, where the first group of resource blocks spans less than a full transmission bandwidth and includes a UE control channel in a first time interval, a relay control channel and a first quantity of dedicated reference symbols in a second time interval, and a shared data channel and a second quantity of dedicated reference symbols in a third time interval. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the disclosed subject matter. Therefore, it is to be understood that it should not be used to interpret or limit the scope or the meaning of the claims.

LTE-Advanced enhancement for vehicular communication

Abstract: Recently, vehicular communication has become an important application in wireless communications. The Long Term Evolution (LTE) system is considered as one candidate to realize vehicular communication due to many reasons, such as: 1. The LTE system provides extensive coverage. 2. The LTE system provides low transmission latency. 3. In Release 12, the LTE system supports ProSe device-todevice (D2D) service, which can be extended to support vehicular communication.