- This topic has 10 replies, 1 voice, and was last updated 15 years ago by mami.
29th November 2005 at 13:13 #43195RF EngrGuest
I want to have the info about the cell_reselect_offset29th November 2005 at 16:36 #43196BokoGuest
This is related to C2. If the level of the neighbour is better than received + cell_reselect_offset you will reselect and camp to the neighbour
Boko30th November 2005 at 06:27 #43197joodGuest
1)what is the disadvantigous of reducing cell-reselect-offs toward zero.
2)for co-site forced transmitter as neighbour, is it right to put cell-reselect-offset zero.30th November 2005 at 09:38 #43198BokoGuest
the idea is that you want the mobile to camp at the cell where you want the conversation to be. for example you camp on a loaded cell in idle mode. the mobile originates a call – but you set the traffic to go to neighbour and => handover. Incresed risk of call drop etc.
CRO can be zero of course but it could happen that you change very often between cells on borders, and neihgbour list changes etc. It’s just a hysteresis.30th November 2005 at 10:59 #43199RF EngrGuest
I have heard that it is also related to the paging load. So, elaborate about this thing too
RF Engr30th November 2005 at 12:19 #43200BokoGuest
Paging load is related with the siza of the LA. It is equal for all cells within the given area2nd December 2005 at 11:33 #43201TechnoGuest
The no. of page is the same for all the cells within a LAC, provided it has the same configuration i.e. combine or non combine Ch., and type of signalling used e.g. 16/32/64kbps. Hope that answer yr question,2nd December 2005 at 16:32 #43202BokoGuest
I still think that the load for the area is equal. The resrictions you mention are related to maximum paging load i.e capacity.
Boicho3rd December 2005 at 13:34 #43203joodGuest
paging load is egual for all LA.
# of cells in LA proportional with paging load at BSC.4th December 2005 at 00:38 #43204EhalaivanGuest
This is a bit of complicated topic, but I try to give you as much as information as possible.
Cell reselection criterion C2 is defined as C2 = C1 + CELL_RESELECT_OFFSET – TEMPORARY_OFFSET
For example, please look at the following senario;
Can you see, which cell is selected as a serving cell in the IDLE mode when the received level from the 900 MHz cell is -80 dBm and from 1800 MHz cell -87 dBm and cellReselectOffset = 10 dB, temporaryOffset = 20 dB and penaltyTime = 640 s are set for the 1800 MHz cell. Minumum access levels for both cells are -100 dBm.
C1 and C2 are used.
C2 criteria has two alternatives depending on the value of penalty time.
– Penalty time is set 640 and thus C2 = C1 – cellReselectOffset
– C1 is used for 900 MHz cell and C1 = -80 – (-100) = 20 dB.
– C2 is used for 1800 MHz cell.
C1 = -87 – (-100) = 13 dB
=> C2 = 13 – 10 = 3 dB
=> 20 (900 MHz) > 3 (1800 MHz)
=> 900 MHz cell is selected!4th December 2005 at 06:26 #43205mamiGuest
is there any feature of controling the C2 criterion by modified the ACCMIN of 1880 band