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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.


Papers
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Journal ArticleDOI
TL;DR: An efficient, low-complexity suboptimal joint resource allocation algorithm is proposed, which outperforms the existingSuboptimal algorithms that simplify the joint design into separate allocation and can drastically improve the fairness as well as the overall throughput.
Abstract: This paper considers an LTE-Advanced cooperative cellular network where a Type II relay station (RS) is deployed to enhance the cell-edge throughput and to extend the coverage area. To better exploit the existing resources, the RS and the eNodeB (eNB) transmit in the same channel (In-Band) with decode-and-forward relaying strategy. For such a network, this paper proposes joint Orthogonal Frequency Division Multiplexing (OFDM) subcarrier and power allocation schemes to optimize the downlink multi-user transmission efficiency. Firstly, an optimal power dividing method between eNB and RS is proposed to maximize the achievable rate on each subcarrier. Based on this result, we show that the optimal joint resource allocation scheme for maximizing the overall throughput is to allocate each subcarrier to the user with the best channel quality and to distribute power in a water-filling manner. Since QoS provision is one of the major design objectives in cellular networks, we further formulate a lexicographical optimization problem to maximize the minimum rate of all users while improving the overall throughput. A sufficient condition for optimality is derived. Due to the complexity of searching for the optimal solution, we propose an efficient, low-complexity suboptimal joint resource allocation algorithm, which outperforms the existing suboptimal algorithms that simplify the joint design into separate allocation. Both theoretical and numerical analyses demonstrate that our proposed scheme can drastically improve the fairness as well as the overall throughput.

47 citations

Journal ArticleDOI
TL;DR: A novel scheme for resource allocation on the packet downlink (DL) control channel (PDCCH) allows PDCCH scheduling algorithms to consider the resources consumed by the random-access procedure on both control and data channels when prioritizing control messages.
Abstract: The Internet of Things (IoT) paradigm stands for virtually interconnected objects that are identifiable and equipped with sensing, computing, and communication capabilities. Services and applications over the IoT architecture can take benefit of the long-term evolution (LTE)/LTE-Advanced (LTE-A), cellular networks to support machine-type communication (MTC). Moreover, it is paramount that MTC do not affect the services provided for traditional human-type communication (HTC). Although previous studies have evaluated the impact of the number of MTC devices on the quality of service (QoS) provided to HTC users, none have considered the joint effect of allocation of control resources and the LTE random-access (RA) procedure. In this paper, a novel scheme for resource allocation on the packet downlink (DL) control channel (PDCCH) is introduced. This scheme allows PDCCH scheduling algorithms to consider the resources consumed by the random-access procedure on both control and data channels when prioritizing control messages. Three PDCCH scheduling algorithms considering RA-related control messages are proposed. Moreover, the impact of MTC devices on QoS provisioning to HTC traffic is evaluated. Results derived via simulation show that the proposed PDCCH scheduling algorithms can improve the QoS provisioning and that MTC can strongly impact on QoS provisioning for real-time traffic.

47 citations

Patent
21 Sep 2009
TL;DR: In this paper, the authors propose a method of operation of a MIMO transmitter, in a cellular network supporting both legacy standard-compliant mobile terminals and next generation standard compliant mobile terminals, the method comprising defining a matrix of resource blocks within an information channel of the cellular network, wherein each resource block corresponds to a region of subcarriers of a transmission timeslot at a given frequency subband.
Abstract: A method of operation of a MIMO transmitter, in a cellular network supporting both legacy standard-compliant mobile terminals and next generation standard-compliant mobile terminals, the method comprising defining a matrix of resource blocks within an information channel of the cellular network, wherein each resource block corresponds to a region of subcarriers of a transmission timeslot at a given frequency subband; assigning a first set of reference signals (RSs) for the legacy standard-compliant mobile terminals to resource blocks at specific locations within the matrix to be transmitted by the MIMO transmitter, the specific locations being defined by, the legacy standard; and assigning a second set of RSs for the next-generation standard-compliant mobile terminals to other resource blocks within the matrix to be transmitted by the MIMO transmitter.

46 citations

Proceedings ArticleDOI
22 Mar 2015
TL;DR: A SCM-PON mobile fronthaul architecture supporting 4+G cell sites with 3 RRHs, 5 aggregated carriers, and 8×8 MIMO (60×20MHz per λ) using 2-GHz-bandwidth optical components with first demonstration of complete RF signal processing.
Abstract: We demonstrate a SCM-PON mobile fronthaul architecture supporting 4+G cell sites with 3 RRHs, 5 aggregated carriers, and 8×8 MIMO (60×20MHz per λ) using 2-GHz-bandwidth optical components with first demonstration of complete RF signal processing.

46 citations

Proceedings ArticleDOI
17 Dec 2010
TL;DR: A practical solution for relay deployments may be limited by load imbalances by introducing a bias to cell selection and handover thresholds and by applying the bias, the relay cells can be extended and an appropriate load balance can be achieved.
Abstract: Decode-and-forward relaying is a promising enhancement to current radio access networks and is now being standardized in the 3GPP work item on LTE-Advanced. Relay enhanced networks are expected to fulfill the demanding coverage and capacity requirements in a cost-efficient way. However, due to the low transmit power characteristic of relay nodes, their coverage areas will be relatively small in the overlaying macro cell. Therefore, the performance of relay deployments may be limited by load imbalances, unless system parameters are properly selected. In this paper, we propose a practical solution for this problem by introducing a bias to cell selection and handover thresholds. By applying the bias, the relay cells can be extended and an appropriate load balance can be achieved. Via a comprehensive system level simulation campaign, it is shown that biasing results in significant user throughput improvements in both the uplink and the downlink.

46 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202242
202156
202082
2019135
2018192