Geneva,28May2010创新.pptVIP

 Geneva, 28 May 2010 Q13 Activities on Time Synchronization Jean-Loup Ferrant, Calnex, Q13 Rapporteur Stefano Ruffini Ericsson, Q13 Associated Rapporteur Joint ITU-T/IEEE Workshop on The Future of Ethernet Transport (Geneva, 28 May 2010) Transport of frequencyin Q13/15 In 2004, Q13 started working on transport of timing on PSN Interworking with TDM was required FDD was the mostly deployed mobile technology (only frequency sync required) Focus on Frequency synchronization 1- Transport of frequency in CES applications 2- Transport of frequency via SyncE First series of recommendations: G.8261, G.8262, G.8264 Initial discussion on time synchronization Transport of time on SyncE was also proposed, but 1588 was preferred * Transport of time in Q13/15 Transport of time became important with TDD and new applications (e.g. MBSFN) Q13 has chosen to focus on 1588-2008 for the transport of time and frequency (NTP also briefly mentioned) Q13 worked on a first ??telecom profile?? (consent planned next week) Q13 workplan has been rearranged to align frequency and time recommendations * Structure of documents in Q13/15 * * Time-Phase Requirements Application Time/Phase synchronization accuracy CDMA2000(3GPP2 C.S0010-B, 3GPP2 C.S0002-C ) +/- 3 ms with respect to UTC (during normal conditions)+/- 10 ms of UTC (when the time sync reference is disconnected) W-CDMA (TDD mode) (3GPP TS 25.402) 2.5 ms phase difference between Base Stations. TD-SCDMA (TDD mode)(3GPP TR 25.836) 3 ms phase difference between Base Stations. LTE (TDD) (3GPP TS 36.133) 3 ms time difference between Base Stations (small cell). 10 ms time difference between Base Stations (large cell). MBSFN (e.g. over LTE) +/- 1 ms with respect to a common time reference (continuous timescale) WiMAX (TDD mode)(IEEE 802.16) Depend on several parameters. As an example +/-0.5 ms and +/-5 ms have been mentioned for a couple of typical cases. IP Network delay Monitoring Depends on the level of quality that shall