한국정보통신설비학회:학술대회논문집
- 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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- Pages.237-241
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- 2008
펨토 기지국의 효과적인 타이밍 동기방안
Effective timing synchronization methods for femtocell
- Shin, Jun-Hyo (LG-NORTEL Mobile Network H/W Team) ;
- Kim, Jung-Hun (LG-NORTEL Mobile Network H/W Team) ;
- Jeong, Seok-Jong (LG-NORTEL Mobile Network H/W Team)
- 발행 : 2008.08.29
초록
Femtocells are cellular access points that connect to a mobile operator's network using residential DSL or cable broadband connections. They have been developed to work with a range of different cellular standards including CDMA, GSM and UMTS. Like legacy base station, the frequency accuracy and phase alignment is necessary for ensuring the quality of service (QoS) for applications 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. So, some techniques are discussed to alternate with the legacy GPS system. NTP, PTP, Synchronous Ethernet use the ethernet to synchronize distributed clocks in packet networks. AGPS support reliable position information than the legacy GPS in poor signal conditions. But, These method also have some problems. So, hybrid timing method like A-GPS+PTP and TV+GPS was developed to make up the weak point of GPS. This paper introduces the each method and compare each other and y propose much better solution for timing synchronization at the Femtocell
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