- This topic has 10 replies, 1 voice, and was last updated 12 years ago by Pix.
20th March 2009 at 18:59 #56337el alishGuest
cell parameter: intracell_HO_allowed
is it related to allow the HO between different frequency bands within the same cell, or to make HO between different TRX’s within the same band on the same cell ?
thanks21st March 2009 at 06:30 #56338AliAsgherGuest
This feature will monitor whenever there is Good Rxlevel but bad RxQual on the MS, then it will try to HO the call to a different TRX in the same cell. The TRX may belong to the same frequency band.21st March 2009 at 07:12 #56339PixGuest
I forgot about the applicability of this parameter. I could check on monday, but perhaps you can get your answer if you check this parameter definition ? (in NPO or in the OMCR)
Otherwise, you’ll have to wait monday 🙂 Or… you could just try it out, and see if the interzone HO still occur when it’s disabled.
AliAsgher, basically the question is : does this parameter control the interzone HO as well ? (cause 10, 11 and 13)21st March 2009 at 21:29 #56340AliAsgherGuest
I thought that Inter-Zone Handovers are between two different cells, whereas el alish questioned about Intra-Cell Handovers WITHIN THE SAME CELL. Can you kindly elaborate the Inter-Zone Handover concept please ?21st March 2009 at 23:17 #56341el alishGuest
i already check the OMCR before asking here, it said it controls the intacell HO.
so i still dont understand this parameter controls the HO from i.s GSM to DCS on the same sector, or the HO between different TRX’x on the same band on the same cell.
if its like the second case, what about hopping ??? the call is on the TS that hops between different TRX’s.22nd March 2009 at 10:15 #56342PixGuest
Inter-Zone HO = HO between the inner zone and outer zone of a concentric or a multiband cell.
I’ll check that tomorrow.
Regarding hopping, you’re asking a question that often arises from operators.
In alcatel, the hopping (bbh or sfh) is done by hopping on frequencies, not hopping on different TRX.
The MS is on TS 3 of TRX 4, and every TDMA frame, the frequency carried onto this timeslot is changed to a new one.
But the MS stays, physically, located on ts3 of trx4.
Pix23rd March 2009 at 13:26 #56343OptimiserGuest
If a cell is in non-hopping mode and is on a TRX which has a frequency which is interfered, it could perfom an intracell Ho to another TTX of the same cell (It monoband cell).
In principle then when you are in nob-hopping, you should have ho-intracell enabled, to perform an HO to another TRX (and hence frequency) when a frequencey is interfered.
In hopping mode (SFH or BBH), because of the constant change of frequencies, bline intracell HO is not necessary.
I have observed that sometimes when you have a faulty TRX there is an increase in intracell HOs, and they are mainly of type “CHO_UL_Interference” even if you are in hopping mode.
Bottom line, if you are sure of your equipment, then for hopping, disable intracell HO (to decrease the probablity of making a drop, etc.) and for non-hopping, enable it.23rd March 2009 at 18:49 #56344PixGuest
Damn, I forgot to check…
Ok, my opinion (90% sure) : intracell HO = disable doesn’t disable the inter-zone HO.24th March 2009 at 10:01 #56345PixGuest
HO_INTRACELL_ALLOWED does not affect specific concentric / multiband cell handovers (cause 10, 11 and 13).
Also, It doesn’t affect TFO HO nor PS->CS Zone HO.
pix24th March 2009 at 18:15 #56346AliAsgherGuest
Does this mean that disabling Intracell HO will only disable the feature to Handover call to a different TRX [depending on UL/DL Quality] But regular handovers [due to layer change/subcell change] will occur normally ?24th March 2009 at 20:30 #56347PixGuest