- This topic has 9 replies, 1 voice, and was last updated 16 years, 6 months ago by Misa.
25th August 2004 at 06:01 #39667PalaniGuest
1 GSM carrier at site A. Since GSM has 7 TCH, I can only have max 7 persons making simultaneous calls. Does this assume that these 7 people are calling people OUTSIDE of the site A??? What if they are actually calling people WITHIN the site A??? How many simultaneous calls can be made???25th August 2004 at 06:33 #39668MisaGuest
No problem if these 7 people are calling outside or inside of the side A. The max number of simultaneous calls is still 7. You can imagine that 1 TCH = 1 PSTN line (fixed tetephone line).
Rgds25th August 2004 at 06:44 #39669PalaniGuest
But if these 7 people are calling within the site A, they are sharing the same resources. So impossible for them to call at the same time, right???
Let’s say Person1 use TS1, Person2 use TS2, so on. Assuming, Person1 call Person2, Person3-Person4, Person5-Person6, Person7 can only call outside site A. True?25th August 2004 at 07:03 #39670MisaGuest
Oh no, however Person7 still make a call to (or receive a call from) PersonX (X = 1 to 6), if PersonX uses call wait/call hold subscription.
This way, Person7 can make a call inside of the site A.
Misa25th August 2004 at 07:19 #39671PalaniGuest
What I am driving at is the no. of unique group calls available at site A with only 1 GSM carrier. Is below true?
Scenerio 1: 7 people are calling people OUTSIDE of the site A, then there will be 7 unique group calls (between 2 people).
Scenerio 2: 7 people are calling people all INSIDE of the site A, then there will only be 3 unique group calls, plus the last person either to be put on hold or call OUTSIDE site A.25th August 2004 at 10:17 #39672MisaGuest
Scenerio 1 is true
Scenerio 2 also is true, except the last call may be on hold or may be NOT on hold (in case if they are using the call conference service)26th August 2004 at 05:39 #39673PalaniGuest
In this case, is there any difference when we calculate the traffic erlang for scenerio 1 & 2?
Does the Erlang C traffic table assume unique calls? Should we use different GOS value for scenerio 1 & 2, since the chance of blocking is obviously higher in scenerio 2?27th August 2004 at 01:33 #39674MisaGuest
I dont see any difference in traffic dimensioning for scenerio 1 & 2. And the Erlang B table should be used, not Erlang C. The GOS also the same for both case. I dont think the chance of blocking in scenerio 2 is higher!!! Because in both scenerio, the call will be connected at the remote MSC side, NOT at the local side.30th August 2004 at 08:43 #39675PalaniGuest
why erlang B, and not erlang C?30th August 2004 at 09:07 #39676MisaGuest
Because this is blocked traffic model, NOT queued traffic model.