- This topic has 33 replies, 1 voice, and was last updated 12 years, 5 months ago by Parnes.
14th August 2006 at 07:46 #45600muhammad ArshadGuest
I would like to start discusions on 3G RELATED INFORMATION IN THIS POSTING.
So that we people update ourselves.
Kindly post your queries.
Md.Arshad16th August 2006 at 11:00 #45601Francis IdachabaGuest
With the increase in 3g networks based on CDMA what happens to all the GSM infrastructure.
Francis Idachaba17th August 2006 at 12:09 #45602yogesh_rfGuest
hi guys ,
I am a Senior GSM Optimization Engineer and i would also like to join you all in 3G related discussions
email@example.com August 2006 at 19:14 #45603DJGuest
Doesnt matter CDMA/GSM …for 3G you have to spent equivalent amount.
Rgds19th August 2006 at 07:41 #45604aviGuest
i have a question, i india the GSM 2.5G system is working but and i read that initially when the 3G deployment starts the 2.5G core network will be used for supporting 3G. I just want to know how that is going to happen, and weather that will differ from vendor to vendor.19th August 2006 at 07:56 #45605Muhammad ArshadGuest
In 3G, the transport network is based on WCDMA but the core will become softswitch based which separate the payload from control layer.so the core portion we can reutilise from GSM.
muhammad arshad19th August 2006 at 08:05 #45606MUHAMMAD ARSHADGuest
I think you r benifitted by my reply to Francis.
Moreover,in 3G We will replace BSCs by RNC and BTS by Node B.The work of MSC is distributed in MSC Server(control part)and Media Gateway(traffic or payload).
The remaining Core network remains to be same i mean to say HLR,EIR etc.We may have many ways to migrate from 2.5G to 3G.
By the way with whom you r working in INDIA
Muhammad Arshad19th August 2006 at 08:47 #45607AviGuest
this reply seems to have made the things clear. rest i can get from the manuals.
I am working for Alcatel BSS in india.
I think the answer is specific to nokia system.22nd August 2006 at 06:58 #45608AviGuest
please explain the difference between cannelisation code and scrambling cone in WCDMA. specially their function in uplink and downlink.22nd August 2006 at 07:57 #45609muhammad arshadGuest
Channelisation codes can increase signal bandwidth using orthogonal codes while scrambling does not effect the signal bandwidth using pseudo noise codes.
In D/L chanelisation codes can separate diff users in the one cell/sector
In U/L IT CAN ONLY SEPARATE THE PHYSICAL CHANNELS/SEVICES OF ONE USER BECAUSE THE MOBILES ARE NOT SYNH. IN TIME
To avoid interference between users scrambling codes are used
firstname.lastname@example.org August 2006 at 09:20 #45610AviGuest
thanks for the reply.
i have one more question, in WCDMA the UE r not synchronised to the Network. how does this work?22nd August 2006 at 09:47 #45611aviGuest
what is the difference between a dedicated user channel and a physical channel. in case of WCDMA air interface.22nd August 2006 at 10:00 #45612aviGuest
“In downlink user channels are seperated by channelisation code”
“in uplink terminals are seperated by scrambling code”
are these two lines trying to explain the same functions performed in uplink and downlink if not what is the difference in the two lines.23rd August 2006 at 12:16 #45613md. arshadGuest
It is possible that two mobiles are using same chanelising code so in order to separate diff. users in the uplink, scrambling code are used.
dedicated ch. reserved for a single user, supporting fast power control and soft HO.
common channel can be used by any user25th August 2006 at 11:20 #45614GovindarajGuest
Any one can Explain the Node B comissioning procedure…….
Is it same like Ultrasite comissioning or what will be difference in hardware point of view…