- This topic has 10 replies, 1 voice, and was last updated 10 years, 4 months ago by paraHO.
3rd May 2010 at 12:49 #62470RamGuest
Will there be user busy case for a calling party if B-party is receiving SMS at that time. The called party has Call waiting active. Will the reception of SMS cause user busy condition. pls clarify.
ram4th May 2010 at 07:47 #62471ManiaGuest
Yup there would be user busy when the called party is on SDCCH if he is on TCH during any transaction then call waiting would come into play.5th May 2010 at 18:11 #62472ramGuest
Thanks Mania.11th May 2010 at 16:39 #62473naveenGuest
I have NEVER heard of a scenario where the calling party is ‘marked busy’because he is getting an SMS. SMS is a low priority service and can be postponed for the sake of a CS call.13th May 2010 at 04:43 #62474ManiaGuest
But if you are already receiving an SMS and that the time a call is made or you are in the SD phase of call setup and during that time some one calls you its observed that he gets user busy.
You can try it by having tems send SMS in a loop and try calling it. from another tems connected to same laptop. then have the events of both MS displayed on the same Event window.13th May 2010 at 10:14 #62475SHELDONGuest
An MS cannot monitor its paging channel if it is on a dedicated channel.
If an MS is receiving an SMS ( which is sent on SDCCH, a dedicated channel), then it can’t monitor it’s paging channel, and at that instant, it will be marked as busy. I agree with Mania.
SHELDON13th May 2010 at 12:26 #62476paraHOGuest
Sheldon how does “MS cannot monitor its paging channel if it is on a dedicated channel.” with the GSM case below:
Case D: Mobile terminating short message transfer, parallel call.
BR14th May 2010 at 13:47 #62477SHELDONGuest
Can you explain what happens in the case you mentioned (from whichever document you’re quoting from)?
I stand to be corrected, but I still think ” an MS cannot monitor its paging channel if it is on a dedicated channel.”
SHELDON14th May 2010 at 14:24 #62478paraHOGuest
Sheldon, I sorry, forgot to mention:
GSM04.11 Annex F or
3GPP 24011 Annex F
“LAPDm SAPI 3 handling for short message service”14th May 2010 at 15:53 #62479SHELDONGuest
The description there does not contradict my point. Case D in that document describes how an SMS is delivered when the receiving MS is on a voice call. In this case, the SMS is sent on the SACCH, as described in the document. This even shows that SMS is not a “low priority service and can be postponed for the sake of a CS call”
SHELDON15th May 2010 at 07:01 #62480paraHOGuest
Yes Sheldon you right. Case D doesn’t contradict. I should have re-read the original question instead of thinking about the later answers.