Currently, many countries are constructing their high-speed railway system

to offer high speed transportation system for passengers those are traveling for long

distance. since passengers may stay in train for long period of time, it will be

attractive to provides them with data services. However, it is challenging task because

all Users Equipment (UE) devices in train have to perform handover frequently at

the same times. This will leads to incur network loads and degraded the network

performance quality. In general when the UE communicate directly with the Evolved

NodeB (eNodeB) it will suffer from a severe degradation of the quality of service

due to path loss and shadowing effect as the wireless signal travailing across the train

carriage. To cope with this issues, the Third-Generation Partnership project (3GPP)

has supported relay communications in the Long-Term Evolution advanced (LTE-A)

release 10 standard [7, 8, 9]. Indeed, using Mobile Relays (MRs) within the highspeed

railway enhances the cellular coverage and overcome the moderate to high

vehicle penetration loss (VPL)[10, 11] and also help to group handover procedures

of (UE) devices, mobile relay also suffer from frequent handover. For example assume

the train travailing with speed of 350 km/h, and going across a coverage area of a

cell size of 2 km, thus the mobile relay will encounter handover every 20.6 s. It is

obvious that the mobile relay will be served by the eNodeB for a very short time.

Moreover, according to the specification of LTE-A [12, 13], the MR has to perform

a measurement procedure before the handover procedure to insure that the signal

quality from the target eNodeB is better than the serving eNodeB. The serving eNodeB

made a handover decision based on the measurement results from the mobile relay

MR. when the serving eNodeB decides that the MR has to handover to the target

eNodeB, the core network then starts the in network handover procedure. However

the current specifications shows that the measurement procedure may take a longer

time period and thus, delays the handover trigger timing. In LTE-A, the measurement

procedure and in network handover procedure are mainly designed for UEs with low to

medium velocities and not suitable for high-speed railway (HSR). Thus, this research

are mainly focused in adopting a mobile relay (MR) between the UE and the eNodeB

in Control/User-Plane(C/U-plane) split heterogeneous networks architecture for high speed

railway. then propose a suitable handover parameters measurement procedure

and in network handover procedure for the high-speed railway in control/user (C/U)

plane split heterogeneous networks to enhance the handover delay of the overall

handover procedure .

Skills: C++ Programming, Telecommunications Engineering, Wireless

About the Employer:
( 0 reviews ) Kota Tinggi, Malaysia

Project ID: #17933381