The Research of Soft Handover Signaling for LTE System in High-Speed Railway Environment
Hard handover (HHO) algorithm has been used for LTE system according to 3GPP specifications. In this paper, a soft handover (SHO) signaling procedure is investigated to validate the feasibility of SHO algorithm for LTE system so as to solve high handover
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The Research of Soft Handover Signaling for LTE System in High-Speed Railway Environment Linlin Luan, Muqing Wu, Panfeng Zhou, Shiping Di and Shuyun Ge
Abstract Hard handover (HHO) algorithm has been used for LTE system according to 3GPP specifications. In this paper, a soft handover (SHO) signaling procedure is investigated to validate the feasibility of SHO algorithm for LTE system so as to solve high handover failure ratio in high-speed railway environment. The paper gives an overview of SHO signaling procedure, SHO algorithm and simulation approach for LTE system. The simulation is implemented to select different handover parameter sets for HOM (Handover hysteresis margin) and TTT (Time-to-Trigger), which is investigated the influence to Ping-Pong handover and radio link failure (RLF) in 350 km/h for the high-speed railway simulation scenario. The results suggest that SHO algorithm has better handover performance than A3 event HHO algorithm in 350 km/h. Keywords Soft handover
Handover performance High-speed railway LTE
L. Luan (&) M. Wu Broadband Communication Networks Lab, Beijing University of Posts and Telecommunications, Postbox 214 Beijing, China e-mail: [email protected] M. Wu e-mail: [email protected] P. Zhou S. Di S. Ge Beijing National Railway Research and Design Institute of Signal and Communication, Beijing, China e-mail: [email protected] S. Di e-mail: [email protected] S. Ge e-mail: [email protected]
W. Lu et al. (eds.), Proceedings of the 2012 International Conference on Information Technology and Software Engineering, Lecture Notes in Electrical Engineering 210, DOI: 10.1007/978-3-642-34528-9_74, Springer-Verlag Berlin Heidelberg 2013
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74.1 Introduction Long-Term Evolution (LTE) is known as Evolved Universal Terrestrial Radio Access Network (E-UTRAN), which is a system currently under development within the 3rd Generation Partnership Project (3GPP) [1]. Orthogonal Frequency Division Multiple Access (OFDMA) and Single Carrier-Frequency-Division Multiple Access (SC-FDMA) have been used downlink and uplink respectively as radio access technology (RAT) for LTE system [2]. With the rapid development of China high-speed railway, there is a requirement for mobility support with high performance up to the speed of 350 km/h, even up to 500 km/h. With the velocity of the UE even higher, the handover will be frequent between the neighboring cells. Therefore, the handover performance becomes more important, especially for real-time service. LTE system is consisted of three elements: evolved-NodeB (eNodeB), Mobile Management Entity (MME), and Serving Gateway (S-GW). The eNodeB performs all radio interface related functions such as packet scheduling and handover mechanism. MME manages mobility, user equipment (UE) identity, and security parameters. The Serving GW is the gateway which terminates the interface towards E-UTRAN [3]. This paper is focus on high-speed railway scenario, which deploys the eNodeB consisting of Base Band Unit (BBU) and Radio Remo
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