A Fractional Soft Handover Scheme for 3GPP LTE-Advanced System

Chang, Joonho; Li, Y.; Feng, Shulan; Wang, H.; Sun, Chen; Zhang, P.

doi:10.1109/iccw.2009.5208019

Cited by 34 publications

(18 citation statements)

References 5 publications

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“…Thus, while being in the coverage-overlap zone, the signals from two or more BSs can be exploited [8], [9], [20]- [24], even if the MS is traveling at a high speed, because the coverageoverlap region is quite large. The physical-layer cooperation studies by Lee et al [22] and Chang [23] further suggested that, in OFDM networks using one or two fast Fourier transform modules in downlink, signals from two different BSs can improve the handoff performance in terms of cell-edge outage for high-speed multimedia services. The approach in [22] is called semisoft handoff (SSHO), which uses a site selection transmit diversity (SSTD) for improved performance at the cell edge.…”

Section: Related Work and Motivationmentioning

confidence: 99%

QoS-Aware Downlink Cooperation for Cell-Edge and Handoff Users

Agarwal

Kumar

Gupta

2015

IEEE Trans. Veh. Technol.

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In this paper, we present a quality-of-service (QoS)aware cooperative downlink scheduling approach for cell-edge and handoff users that offers more reliability and higher effective capacity. The cooperation (handoff) region is defined for active handoff users between two adjacent base stations (BSs) as a function of the user QoS requirements and network load. In addition, the proposed technique inherently acquires intercell interference (ICI) coordination by adjusting the position and size of the cooperation window suitably. Numerical results are presented showing reliability, user QoS and capacity gain performance, and the region for cooperative scheduling in a coded communication scenario. Our analysis indicates that cooperation provides relatively less gain in effective capacity, i.e., up to about 40% with respect to noncooperative handoff, when the QoS requirement is loose. On the other hand, when the QoS requirement is more stringent, the effective capacity gain can increase up to nearly 100%. Additionally, we show that, while for applications with a loose QoS requirement the cooperation window size is small, i.e., nearly 1% of the total area of the BSs participating in cooperation, it increases quite significantly, i.e., up to nearly 25%, for the applications with stringent QoS. Although the outage performance of the proposed approach is poorer than the joint transmission mode of a cooperative multipoint scheme in lightly loaded networks, its effective capacity is significantly higher under varying network traffic load and QoS constraints.Index Terms-Cooperative handoff, cooperation region-ofinterest, effective capacity, outage probability. 0018-9545

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Section: Related Work and Motivationmentioning

confidence: 99%

QoS-Aware Downlink Cooperation for Cell-Edge and Handoff Users

Agarwal

Kumar

Gupta

2015

IEEE Trans. Veh. Technol.

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“…The handoff process is of two major types: hard handoff and soft handoff. Different variants of hard handoff and soft handoff are semisoft handoff and fractional handoff in OFDM based systems [8], [9], fast base station switching (FBSS) [10], and macrodiversity handoff (MDHO) [10]. Before performing handoff, an appropriate BS candidate must be chosen and then the handoff procedure should be continued based on the current technology and the specific application constraints of the MS.…”

Section: Related Workmentioning

confidence: 99%

Class-Based Shared Resource Allocation for Cell-Edge Users in OFDMA Networks

Singhal

Kumar²,

et al. 2014

IEEE Trans. on Mobile Comput.

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Abstract-In this paper, we present a new resource allocation scheme for cell-edge active users to achieve improved performance in terms of a higher system capacity and better quality-of-service (QoS) guarantee of the users, where we utilize the two-dimensional resource allocation flexibility of orthogonal frequency division multiple access (OFDMA) networks. Here, the mobile stations (MSs) at the cell-edge can maintain parallel connections with more than one base station (BS) when it is in their coverage area. A MS, before handoff to a new BS, seeks to utilize additional resources from the other BSs if the BS through which its current session is registered is not able to satisfy its requirements. The handoff procedure is termed as split handoff. The BSs participate in split handoff operation while guaranteeing that they are able to maintain QoS of the existing connections associated with them. In this study, first, we present the proposed shared resource allocation architecture and protocol functionalities in split handoff, and give a theoretical proof of concept of system capacity gain associated with the shared resource allocation approach. Then, we provide a differentiated QoS provisioning approach that accounts for the MS speed, its channel quality, as well as the loads at different BSs. Via extensive simulations in Qualnet, the benefits of the proposed class-based split handoff approach is demonstrated. The results also indicate traffic load balancing property of the proposed scheme in heavy traffic conditions.

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“…A new connection will be established with target eNodeB while the old connection with source eNodeB is maintained. The UE simultaneously receive all services data from several active eNodeBs [3]. The proposed relay algorithm mentioned in this paper is between those two and based on the traditional A3 event-based HO algorithm.…”

Section: Introductionmentioning

confidence: 99%

An optimized relay handover algorithm in TD-LTE along high-speed railway

Deng

Muqing

Ziqing

2013

2013 IEEE International Conference of IEEE Region 10 (TENCON 2013)

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Handover (HO) is one of the key procedures, which ensures user equipment (UE) moving smoothly in long term evolution (LTE) systems. Generally, hard handover has a high outage probability and is relatively simple, but when the velocity of UE is high, the procedure may be unreliable, especially for VoIP service. In the special scenario high-speed railway, network deployment is known and an optimized relay algorithm could be applied according to information already known, such as cell deployment and direction of UE running. Simulation results show that algorithm proposed performs better than the traditional hard handover in high-speed railway networks.

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A Fractional Soft Handover Scheme for 3GPP LTE-Advanced System

Cited by 34 publications

References 5 publications

QoS-Aware Downlink Cooperation for Cell-Edge and Handoff Users

QoS-Aware Downlink Cooperation for Cell-Edge and Handoff Users

Class-Based Shared Resource Allocation for Cell-Edge Users in OFDMA Networks

An optimized relay handover algorithm in TD-LTE along high-speed railway

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