Handover Performance in 3GPP Long Term Evolution (LTE) Systems

Rácz, András; Temesvary, Andras; Reider, Norbert

doi:10.1109/istmwc.2007.4299068

Cited by 48 publications

(20 citation statements)

References 4 publications

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“…Based on that, the UE can then compute the path loss using (13) [25]. A correct HO decision increases the capacity of the system, gives better coverage, gains higher throughput, and reduces latency [28]. On the other hand, an HO that is too late or too early will adversely affect the performance of the network.…”

Section: Rsrpmentioning

confidence: 99%

Reduction of Outage Probability Due to Handover by Mitigating Inter-cell Interference in Long-Term Evolution Networks

Hussein

Ali

Rasid

et al. 2014

ETRI J

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The burgeoning growth of real-time applications, such as interactive video and VoIP, places a heavy demand for a high data rate and guarantee of QoS from a network. This is being addressed by fourth generation networks such as Long-Term Evolution (LTE). But, the mobility of user equipment that needs to be handed over to a new evolved node base-station (eNB) while maintaining connectivity with high data rates poses a significant challenge that needs to be addressed. Handover (HO) normally takes place at cell borders, which normally suffers high interference. This inter-cell interference (ICI) can affect HO procedures, as well as reduce throughput. In this paper, soft frequency reuse (SFR) and multiple preparations (MP), so-called SFRAMP, are proposed to provide a seamless and fast handover with high throughput by keeping the ICI low. Simulation results using LTE-Sim show that the outage probability and delay are reduced by 24.4% and 11.9%, respectively, over the hard handover method -quite a significant result.Keywords: LTE, outage probability, multiple preparation, soft frequency reuse, radio resource control, inter-cell interference. Manuscript received Sept. 24, 2013; revised Nov. 18, 2013; accepted Nov. 21, 2013 I. IntroductionA fast and seamless handover poses twin challenges for LTE networks to address, especially at high data rates. Hard handover (HHO), where a connection with a previous evolved node base-station (eNB) is severed before being handed over to the next eNB, is only to be considered in LTE networks using handover parameters, such as Layer 3 filtering (L-3), handover margin (HOM), and Time-to-Trigger (TTT) [1]- [2]. HHO suffers from some drawbacks, such as high outage probability, long delays, and unreliable break-before-make procedures [3]. In addition, it is difficult to maintain QoS requirements due to the delay incurred in the HHO during the eNB migration process, which is the process of moving from the serving eNB to the target eNB. Many studies have been conducted to improve HHO, and this issue has been reviewed well in [4]. There are others who have taken a different approach; that is, taking advantage of both soft handover (SHO) and HHO, as seen in [5]-[7]. In [5], the authors proposed a fractional SHO scheme based on carrier aggregation. In this scheme, it combines SHO and HHO depending on traffic. For example, for VoIP it performs an SHO, and for non-VoIP it performs an HHO, both of which are performed with a frequency reuse factor (FRF) of one. The authors in [6] and [7] used macroscopic diversity in an SHO. This resulted in a much better reduction of HO outage probability than that of [5], although none of them employed any type of ICI mitigation mechanism and where all studies used an FRF of one. A more numerical analysis has been presented in [7]. In [8], the authors proposed a bandwidth reservation based on a mobility

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Section: Rsrpmentioning

confidence: 99%

Reduction of Outage Probability Due to Handover by Mitigating Inter-cell Interference in Long-Term Evolution Networks

Hussein

Ali

Rasid

et al. 2014

ETRI J

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“…While soft handovers may improve the throughput of VoIP applications [18], it is known to have a negative impact on data applications [19], [20]. In [4] and [6], the authors present performance studies of the standard LTE handover schemes: drop and forward. They show that by forwarding packets from the old eNB to the new one, TCP throughput increases notably because unnecessary timeouts are avoided.…”

Section: Related Workmentioning

confidence: 99%

“…A similar reference model was proposed by [1], [4], [5], [6]. There is a routing path from the GW to eNB 1 and a routing path to eNB 2 .…”

Section: A Our Modelmentioning

confidence: 99%

“…Since new packets are routed directly from the sender to the UE through eNB 2 , some of the forwarded packets might be received out of order. Forwarding the packets of a connection from the old eNB to the new one rather than dropping them and leaving the recovery to TCP can significantly improve TCP performance and reduce variance [4], [5], [6]. Therefore, if enough network resources are available for packet forwarding, it is the preferred Fig.…”

Section: Introductionmentioning

confidence: 99%

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Handovers with Forward Admission Control for Adaptive TCP Streaming in LTE-Advanced with Small Cells

Cohen

Levin

2012

2012 21st International Conference on Computer Communications and Networks (ICCCN)

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Abstract-An important trend in the evolution of cellular networks is the introduction of cost efficient small cells. However, most of these cells will have only wireless connectivity to the backbone. Consequently, handovers will be needed much more frequently and the bandwidth between neighboring cells will become a scarce resource. Both problems are likely to affect one of the most fast growing cellular applications: adaptive TCP video streaming. While the high handover rate is likely to have a negative impact on TCP streaming due to packet loss during handovers, solutions that forward packets from the old cell to the new one must limit the amount of wireless bandwidth they use. This tradeoff is addressed in the following paper.

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“…However, various BS coverage sizes cause unreliable communication link when users moves from one big BS to a small BS or vice versa [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A Novel Reliability Enhanced Handoff Method in Future Wireless Heterogeneous Networks

Wang

2016

MATEC Web of Conferences

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Abstract. As the demand increases, future networks will follow the trends of network variety and service flexibility, which requires heterogeneous type of network deployment and reliable communication method. In practice, most communication failure happens due to the bad radio link quality, i.e., high-speed users suffers a lot on the problem of radio link failure, which causes the problem of communication interrupt and radio link recovery. To make the communication more reliable, especially for the high mobility users, we propose a novel communication handoff mechanism to reduce the occurrence of service interrupt. Based on computer simulation, we find that the reliability on the service is greatly improved.

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Handover Performance in 3GPP Long Term Evolution (LTE) Systems

Cited by 48 publications

References 4 publications

Reduction of Outage Probability Due to Handover by Mitigating Inter-cell Interference in Long-Term Evolution Networks

Reduction of Outage Probability Due to Handover by Mitigating Inter-cell Interference in Long-Term Evolution Networks

Handovers with Forward Admission Control for Adaptive TCP Streaming in LTE-Advanced with Small Cells

A Novel Reliability Enhanced Handoff Method in Future Wireless Heterogeneous Networks

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