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alkesh
2009-05-08, 02:50 AM
Can somebody please explain this SDCCH + SACCH combination
in Uplink

ghassen
2009-05-08, 03:13 AM
Can somebody please explain this SDCCH + SACCH combination
in Uplink

can you make your question more clear please????
8 SDCCH + 8 SACCH. This combination is used to provide additional SDCCH capacity in medium and large cells

alkesh
2009-05-08, 03:33 AM
SACCH is used for measurement reports in uplink right, which is in TCH.

Now what is the purpose of SDCCH + SACCH on uplink. How additional
SACCH provides SDCCH capacity? Does this mean, on these additional
SACCH - call setup, location updates can take place?



can you make your question more clear please????
8 SDCCH + 8 SACCH. This combination is used to provide additional SDCCH capacity in medium and large cells

alibushehri
2009-05-08, 03:33 AM
Can somebody please explain this SDCCH + SACCH combination
in Uplink


The actuall assigned signaling channel to a MS is "SDCCH + SACCH" which like the combination with a TCH it is used to control the performance of the channel.

Only FACCH is used with TCH. So we need to configure 8 or 4 SDCCH Block with 8 or 4 SACCH Block.

ghassen
2009-05-08, 04:54 AM
SACCH is used for measurement reports in uplink right, which is in TCH.

Now what is the purpose of SDCCH + SACCH on uplink. How additional
SACCH provides SDCCH capacity? Does this mean, on these additional
SACCH - call setup, location updates can take place?

sdcch is used for some procedure like ciphering authentication sending sms in not connected mode (outband signaling) and also measurement then when you increase the number of the sdcch you give more chance to subscriber to connect to bts there is a trafic formula i will give it later so sdcch ressources are fixed resources specified on bsc database when sdcch congestion threshold is reached then the system will move 8 channel from tchsd pool with best quality to sdcch backup pool and then will check again if there is an empty sdcch if not the system will move this channel from backup pool to sdcch pool and the the channel will be used when all the 8 channels are released then they will be moved back to tchsd pool
in this way we give more flexibility to the system to managee the sdcch channels

kais
2009-07-16, 01:08 AM
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