BillRoland
Premium
join:2001-01-21
Ocala, FL
clubs:
 ·Cox HSI
| reply to Michieru2
Well there are a few things to keep in mind about NEXTEL. Right now for instance they are in the middle of the re-banding effort in which they're moving to different ESMR spectrum and getting away from Public Safety Radio frequencies to eliminate interference. While this is happening (its going on nationwide now I believe), NEXTEL effectively loses 25% of their capacity as they have to vacate channels and wait for Public Safety to relocate to them and vacate the other channels for NEXTEL to move to them. During this time they've turned WiDEN off pretty much everywhere, and they're also using data channels for voice in the interim, meaning iDEN data just got even slower. Re-banding has created a mess. When its all said and done things should improve though.
System Busy, Call Failed, etc are all indicative of major congestion problems, obviously. You may notice them adding 900MHz channels to alleviate congestion but its my understanding that these 900MHz channels are only being used for interconnect calls at this time. A3 User Busy In Data is just what it means, its not a system issue it means whoever you're trying to Direct Connect is using the web or sending/receiving a text or MMS message. Also when you attempt to call somebody and receive the "Please hold while the NEXTEL subscriber you are trying to reach is located," one of four things has happened:
1. Their phone did not respond when the system tried to page it that it had an incoming phone call. As a result the iDEN network will page all the cell sites in a radius around the site where your phone was last known to be registered, instructing it to make contact with the system immediately.
2. The user is on a Direct Connect call. If this is the case, then the system knows where the customer you are trying to call is. It is simply stalling you in the hope that the dispatch (Direct Connect) session will time out (it times out after 6 seconds of inactivity) and it can page the phone to inform it that it has an incoming interconnect call.
3. The user is browsing the web or sending/receiving a message. If this is happening, again the system knows where the phone it, but it is simply stalling in the hope that a break in the data action will allow it to page the phone and inform it that it has an incoming call.
4. The cell site is too busy and has no free channels to use for a voice call. In this situation the message is simply played to stall the user in the hope that a channel will become available in which to complete the call.
At this point in time, iDEN cannot have an active voice and data session going at the same time. I don't believe CDMA can either, however I think UMTS/HSDPA can.
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