Cluster-based multihop synchronization scheme for femtocell network
Femtocell technology has been drawing considerable attention as a costeffective means of improving cellular coverage and capacity. It is connected to the core network through an IP backhaul and can only use timing protocols such as IEEE1588 or Network Time Protocol (NTP). Furthermore, the femtoce...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IIUM Press
2012
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/50169/ http://irep.iium.edu.my/50169/ http://irep.iium.edu.my/50169/1/310-1654-1-PB.pdf |
| Summary: | Femtocell technology has been drawing considerable attention as a costeffective
means of improving cellular coverage and capacity. It is connected to the core
network through an IP backhaul and can only use timing protocols such as IEEE1588 or
Network Time Protocol (NTP). Furthermore, the femtocell is installed indoor, and
cannot use a GPS antenna for time synchronization. High-precision crystal oscillators
can solve the timing problem, but they are often too expensive for consumer grade
devices. Therefore, femtocell Base Station (fBS) synchronization is one of the principle
technical trends in femtocell deployment. Since fBSand macrocell Base Station (mBS)
network operates on the same frequency under a licensed spectrum, fBS network can
interfere with the macrocell network. In addition, fBSs can also interfere with each other
if multiple units are in close proximity. Furthermore, in a flat fBS structured network
using IEEE 1588 synchronization algorithm and fBS-fBS synchronization scheme
creates offset and frequency error which results inaccurate synchronization. In order to
reduce offset and frequency error (skew), this paper proposed a cluster-based multihop
synchronization scheme to achieve precise in fBS neighbor nodes. The proposed scheme
is able to reduce the offset and skew significantly.
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