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Dear all
I want the information that once, a particular subscriber send a sms to another guy, what is the flow of the SMS tx.
To be simple, the flow will be from MS – MSC -SMSC – after enquiry with HLR – MSC – MS.
Dear Ram
I want the signalling flow…….like SDCCH, TCH…so on
RACH (UL): channel request
AGCH (DL): immediate assignment
SDCCH (UL&DL): DTAP phase (authentication)
same : SMS transmission
Channel release-end-
Dear Ram
thanx a lot dear
you’re welcome dear
Hey Pix,
Does SMS floats on SDCCH? Thanks for the information. And what about other supplementary services (like Call hold / waiting tone etc.)
Sachin
Yes, SMS is usually on SDCCH. The only (rare) alternative I know is the “SMS over GPRS”, where a PDCH is allocated to the SMS senders / receivers.
I’ve never seen it live though…
Call Hold and other supp. services are probably on the TCH (but i’m not sure). It seems dangerous to allocate a SDCCH for such “long” procedures, because SDCCH resources are critical and shall not be wasted.
I think, that non-call assotiated supplementary services (e.g. Call Forwarding operations) are activated, deactivated, interrogated etc. on SDCCH. But invocation Call Hold during the call is transfered on SACCH. Call Waiting Tone is standart supervisory tone and more likely than not is generated in MS on basis of signals (SACCH) from the network.
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