- This topic has 8 replies, 1 voice, and was last updated 15 years, 6 months ago by RF.
22nd May 2006 at 16:00 #45066JeffGuest
between 2 cells from different sites it’s recommended for them not to be synchronized,whereas 2 cells from the same site should be synchronized.
Do you know why?
Thanks22nd May 2006 at 23:02 #45067pixGuest
best case : all cells are synchronized all over the network. It nallows faster handovers.
normal case : it is impossible to synchronize cells from different BTS (unless using GPS synchronization), whereas cells within a BTS are always synchronized (they share the same clock).24th May 2006 at 18:32 #45068JeffGuest
Do you really think it’s possible to synchronise cells all aver the network???
Thanks for your answer…
I can see you’re present in a lot of forum:)24th May 2006 at 19:06 #45069pixGuest
well, it’s interesting to learn about situations other telecoms engineers are facing. I’m really glad I found this forum !
frankly, i don’t think it is possible to synchronize all cells of a network… It would mean all BTS are loaded with a GPS device, which is a bit unrealistic. And it is useless, because non-synchronized HO are working perfectly fine anyway 🙂2nd June 2006 at 10:53 #45070M.ThyagarajanGuest
It is possible and implemented in many parts of india , we have synchronised BTS (Cluster of BTS), not only it improves the handover performance it is usefull for frequency hopping situation.
regards14th March 2007 at 00:28 #45071PhaysalGuest
If talking abt CDMA, all BTS are recommended to be equipped with GPS. In Pakistan as well, telco’s are using GPS for SYNCing their networks. But the question is how much the sync affects the network KPIs.
Thyagarajan, can u give some statistical ideas?!!14th March 2007 at 10:11 #45072RFGuest
if your GPS are affected ( the number of satellite connected with your GPS low then 4 ) you risk to have SHO failure
Regards15th March 2007 at 05:29 #45073PhaysalGuest
This may not always be the case, coz clocks based on GPS can provide holdover for more than 25 hrs normally. If u lose GPS signal, LO would be able to keep the equipment synced, until u get ur GPS fixed!
What do u say!?16th March 2007 at 11:22 #45074RFGuest
the GPS synchronize all the BTS with BSC ,and in CDMA we have sot , softer handoff , and also MS& BTS have rake receiver for these we need to GPS