한국정보통신설비학회:학술대회논문집
- 한국정보통신설비학회 2009년도 정보통신설비 학술대회
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- Pages.275-280
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- 2009
초소형 기지국에서 타이밍 품질 향상을 위한 PDV 제어 방안
The study on effective PDV control for IEE1588
- Kim, Hyun-Soo (LG-NORTEL Access Network Team) ;
- Shin, Jun-Hyo (LG-NORTEL Access Network Team) ;
- Kim, Jung-Hun (LG-NORTEL Access Network Team) ;
- Jeong, Seok-Jong (LG-NORTEL Access Network Team)
- 발행 : 2009.08.27
초록
Femtocells are viewed as a promising option for mobile operators to improve coverage and provide high-data-rate services in a cost-effective manner Femtocells can be used to serve indoor users, resulting in a powerful solution for ubiquitous indoor and outdoor coverage. TThe frequency accuracy and phase alignment is necessary for ensuring the quality of service (QoS) forapplications such as voice, real-time video, wireless hand-off, and data over a converged access medium at the femtocell. But, the GPS has some problem to be used at the femtocell, because it is difficult to set-up, depends on the satellite condition, and very expensive. The IEEE 1588 specification provides a low-cost means for clock synchronisation over a broadband Internet connection. The Time of Packet (ToP) specified in IEEE 1588 is able to synchronize distributed clocks with an accuracy of less than one microsecond in packet networks. However, the timing synchronization over packet switched networks is a difficult task because packet networks introduce large and highly variable packet delays. This paper proposes an enhanced filter algorithm to reduce ths packet delay variation effects and maintain ToP slave clock synchronization performance. The results are presented to demonstrate in the intra-networks and show the improved performance case when the efficient ToP filter algorithm is applied.